1. Product Overview
This experimental system uses a double-fed asynchronous generator , which can complete the wind turbine simulation and operation tr*ning of high-power double-fed wind turbine sets.
II. Product Features
1) Simulate the start-up, grid connection, normal operation and shutdown process of real wind turbines , and have the ability to simulate the speed adjustment of the unit, and the ability to adjust active and reactive power;
2) The wind speed model can not only set several typical wind speed curves, but also support the import of wind speed-time data obt*ned by actual measurement;
3) FaceView experimental m*n control software performs unit operation status process control and data recording, display, system monitoring and other functions;
4) Realize wind speed and wind turbine simulation, unit grid connection control, unit maximum power operation control, unit constant speed operation, unit power limit operation, unit low voltage ride-through, unit off-grid control and other control functions;
5) The back-to-back converter can realize the initial state of the DC side voltage setting, realize the unity power factor grid connection, realize the wind turbine under fault conditions without off-grid operation, low voltage ride-through function, and support the low voltage ride-through experiment of the wind turbine;
6) The software analyzes the data and operating characteristics of wind power generation, and can display the cause of the abnormal fault;
7) RS485 interface, providing open MODBUS protocol access monitoring system;
8) Complete protection functions, including overvoltage protection, overcurrent protection, overtemperature protection, overspeed protection, and short circuit protection, which can realize low voltage ride-through and protection experiments when the external power supply voltage is unstable;
Note: with eye-catching danger signs, such as: there is electrical danger, do not open during operation, and strictly operate with power on.
2. System operation technical parameters
2.1 Working conditions
Input voltage: three-phase four-wire ~ 380V ± 10% 50Hz
Device capacity: ≤5.0kW
Altitude: 0 ~ 2000m;
Ambient temperature: -10℃ ~ +50℃;
Ambient relative humidity: 10 ~ 90% (25℃);
Atmospheric pressure range: 1 standard atmospheric pressure range;
Indoor installation;
The platform must be installed horizontally;
Normal service life of the equipment: ≥ 20 years;
Environmental requirements: The environment is well ventilated and does not cont*n flammable or corrosive gases;
2.2 Basic dimensions of the experimental platform:
Experimental table : 1400×400×400; (length × depth × height, mm)
Converter: 800×800×2000;
M*n control cabinet: 800×800×2000;
Note: The experimental platform is arranged in two rows, with an estimated area of 4m×4m
2.2 Customized double-fed converter
system Wind power converters include double-fed wind turbine converters, full-power converters and PWM rectifiers, all of which are independently developed by our company and customized according to the requirements of colleges and research institutes. They have the characteristics of complete functions, reliable products, strong openness, strict protection, etc.
The converter that simulates the wind power generation system is realized by AC-DC-AC PWM converter. The front-stage AC input can be optionally connected to the AC/DC grid. According to the set wind speed, the corresponding energy is injected into the DC bus. The rear-stage AC output is connected to the AC bus to inject the input energy into the distribution/microgrid. The converter is a customized product designed according to user requirements, with the following functional features:
machine-side vector control, grid-side vector decoupling P/Q control;
normal operation when the grid voltage fluctuates within the range of -3% to +7%;
total harmonic distortion rate of grid-connected full-load current is less than 5%;
overcurrent/overvoltage/overtemperature protection, divided into hardware protection and software protection;
low voltage ride-through function; interface for connecting other electrical equipment
on the DC side ; support normal power generation operation when the grid imbalance is less than 10%; support a wide operating speed range: 700-2000RPM; 5.0 kW back-to-back converter m*n indicators
|
Project indicators |
Parameter characteristics |
Project indicators |
Parameter characteristics |
|
Converter topology |
Double level back to back |
Post-stage control method |
Stabilize DC voltage |
|
Rated flow power |
5.0kW |
Post-stage power factor |
>0.99 |
|
Rated AC current |
15A |
DC bus voltage |
600V |
|
Rated AC voltage |
380V |
Maximum DC current |
22A |
|
Rated grid frequency |
50Hz |
Current total harmonic distortion (THD) |
<3% (rated power) |
|
Allowable grid frequency |
48～50.5Hz |
Maximum efficiency |
95% |
|
Pre-stage control method |
Power Control |
Standby power consumption |
<40W |
|
Pre-stage power factor |
>0.99 |
cooling method |
Forced *r cooling |
|
Protection level |
IP21 |
Standard communication method |
RS485 |
2.3 M*n configuration parameters of the device
|
Drive inverter |
Capacity rating |
5.5KW |
|
Voltage level |
380V |
|
Motor Type |
Asynchronous/Permanent Magnet Synchronous Motor |
|
Speed range |
0-2000RPM |
|
control method |
With PG vector control, weak magnetic control |
|
Interface Type |
RS485 |
|
Control loop |
Speed closed loop, torque closed loop |
|
Accuracy |
Signal measurement of voltage, current, speed, position and torque |
|
Customized converter |
Power level |
5.5KW |
|
Voltage level |
380V |
|
Power Topology |
Two-level back-to-back |
|
Dimensions |
(width × depth × height, mm) 800 × 600 × 1600 |
|
Electric Motor |
rated power |
5.5KW |
|
Rated speed |
1500RPM |
|
Synchronous speed |
1800RPM |
|
Rated voltage |
380V |
|
Power Factor |
0.9 |
|
dynamo |
type |
Doubly-fed generator |
|
rated power |
5.0kW |
|
Rated voltage |
380V |
|
Rated frequency |
50Hz |
|
Rated speed |
1500rpm |
|
range of rotation |
0-2000rpm |
|
Insulation class |
F-Class |
2.4 Virtual simulation software for electrical installation of building and intelligent building Designed based on unity3d, users can choose different sizes of interactive interface according to computer configuration, and can choose six levels of image quality. The model in the software can be rotated 360°, enlarged, reduced, and translated. There are assistant prompts during the use of the software, as follows: A. Wet alarm system 1. System overview: Overview of wet alarm system 2. Equipment recognition: It has the best viewing angle, equipment det*ls (displaying the introduction or parameters of the equipment), exercises (built-in 6 multiple-choice questions, with prompts for correct and wrong choices), schematic diagram (you can enter the equipment from the schematic diagram). The equipment includes: sprinkler, water flow indicator, signal butterfly valve, exhaust valve, fire alarm control, high pressure gauge, high-level water tank, Wia control cabinet, pressure regulating tank, flow switch, end water test device, dr*nage facilities, water pump connector, hydraulic alarm, delay, wet alarm, butterfly valve, check valve, fire pump, safety pressure regulating valve, fire water tank. 3. Principle display: Display the working principle of the wet alarm system, 3D animation demonstration, 3D model is semi-transparent, and the internal water flow can be seen. Equipped with exercise module (4 multiple-choice questions are built-in, and there are prompts for correct and wrong choices) 4. Design layout: There are multiple-choice questions and calculation questions, each of which is scored, and the correct answer and score are displayed after submission B. Gas fire extinguishing system 1. System overview: Overview of gas fire extinguishing system 2. Equipment recognition: There are optimal viewing angles, equipment det*ls (displaying the introduction or parameters of the equipment), exercises (8 built-in multiple-choice questions, and there are prompts for correct and wrong choices), and schematic diagrams (you can enter the equipment from the schematic diagram). The equipment includes: nozzles, HFC-227 storage bottles, bottle head valves, heptafluoropropane check valves, high-pressure hoses, gas check valves, safety valves, weighing alarms, electromagnetic starters, selection valves, smoke alarms, and fire alarm controllers. 3. Principle display: Display the working principle of the gas fire extinguishing system, 3D animation demonstrations, and 3D models are semi-transparent, and the internal gas can be seen. Equipped with practice module (built-in 3 multiple-choice questions, with prompts for correct and incorrect choices) 4. Design layout: There are 6 multiple-choice questions, each with a score, and the correct answer and score will be displayed after submission C. Escape drill: Teaching in the form of fun games, escaping from the burning room within a limited time, and wrong choices will directly enter the score interface. III. Low voltage ride-through and experiment of double-fed system
3.1 Hazards of grid voltage drop
For double-fed wind turbines:
the overcurrent will damage power electronic devices;
the overvoltage at the DC end will threaten the components on the DC side;
the additional torque and excessive stress will damage the mechanical parts of the wind turbine;
for the power grid:
it will cause the grid frequency to drop;
it will cause the grid line voltage to drop;
it will trigger an interlocking effect, leading to large-scale grid paralysis.
3.2 Definition and significance of low voltage ride-through LVRT
When a grid fault or disturbance causes a voltage drop at the wind farm grid connection point, the wind turbine can be connected to the grid uninterruptedly within the range of the voltage drop.
It has a more important significance to the system:
the wind turbine can continue to operate without disconnecting from the grid;
it can support the grid with dynamic reactive power Q;
it helps to restore active power P;
3.3 Domestic low voltage ride-through standards
For low voltage ride-through, the requirements are shown in the figure below, and the solution fully complies with this standard:
when the grid connection point voltage drops to 20% of the rated voltage, it is guaranteed to run continuously for 625ms without disconnecting from the grid;
when it recovers to 90% of the rated voltage within 2s after the drop, it will continue to run without disconnecting from the grid.
Reactive support: response time is no more than 75ms, duration is no less than 550ms; reactive current meets IT≥1.5×(0.9-UT)IN, (0.2≤UT≤0.9)
Active recovery: after fault removal, the power is restored to the power before the fault drop at a rate of at least 10% of the rated power/second;
3.4 Introduction to the LVRT experimental scheme
M*nly to add Crowbar and Chopper circuits to the converter, and perform corresponding control in the converter:
Crowbar: It has a short response time and can protect the converter IGBT, absorb and attenuate distortion current and harmonic current
Chopper: M*nly consider the design of the single-tube absorption circuit. Different from the switching working mode of Crowbar, the Chopper device will perform a chopping action of about 100Hz during operation. The peak when the large current is turned off can easily cause the IGBT to over-voltage f*lure. Therefore, the RCD absorption circuit and low-inductance power circuit are designed.
4. Double-fed system experiment m*n control software
FaceView experiment m*n control software has wind speed characteristic simulation and wind turbine m*n control function, which can simulate several typical wind speeds such as: breeze, gust, continuous strong wind, continuous medium wind, or four wind speed synthesis characteristics. The parameter modification authority of the m*n control and wind turbine simulation is open to users. Users can freely customize the characteristics of wind turbines and receive actual anemometer data. The m*n control function realizes the grid-connected control of the unit, constant speed operation, power limit operation, power reduction operation, low voltage ride-through, and unit off-grid control.
FaceView monitors the following parameters:
wind speed, wind wheel speed;
drive motor rotor position/speed, current, voltage, power, output torque;
generator rotor position/speed, current, voltage, power, output torque;
converter DC voltage;
grid-side converter output voltage, current, power;
grid voltage, current, power.
5. Open double-fed wind power converter system (description)
The algorithm class function is open, and users can modify and call it according to their own algorithms, such as rectification, inversion, SVPWM of motor control and low voltage ride-through algorithm.
The open content is as follows:
1) Hardware schematics and BOM lists of all circuit boards of the doubly-fed converter (pdf version): control board, power board, signal board, capacitor board;
2) Electrical schematics and BOM lists of the doubly-fed converter cabinet (pdf version);
3) Open the debug interface of the control board, and customers can burn their own programs;
4) Communication protocol of the doubly-fed converter (RS485) (free);
5) User manual of the doubly-fed converter (free);
6) Doubly-fed converter programming manual pdf version;
Engineering source files of the doubly-fed converter software low voltage ride-through algorithm, rectifier SVPWM algorithm and motor control SVPWM algorithm, including the m*n framework of the program, hardware driver function, hardware configuration function, communication function, protection function, encoder function, sampling function, phase-locked loop function, filter function, etc. Users can modify and call the low voltage ride-through algorithm, rectifier SVPWM algorithm and motor control SVPWM algorithm.
VI. Supporting teaching resources (1 set in total)
(I) Online education course open platform:
1) This system is a diversified management platform for interoperable teaching. It integrates the traditional platforms of users and centralizes interoperable management to solve the problems of multi-platform and multi-account management and the inability to centrally count the scattered databases. The system includes: online teaching management system, online course resource management platform, online question bank platform, online examination and assessment platform, online video course management platform and online virtual simulation teaching management platform, which is a truly one-stop interoperable data centralized statistics!
(II) New energy teaching system simulation software
I. Software Overview
1. Through this software, you can systematically learn all series of photovolt*c knowledge content such as solar photovolt*c silicon materials, battery cells, photovolt*c modules, photovolt*c module ancillary materials, photovolt*c application products, etc.
2. Equipped with text and animation to show and introduce the process from raw materials to finished products, including intermediate processing technology and usage methods.
3. The multimedia system comes with voice explanation, which displays and expl*ns with pictures, texts and sounds, and plays synchronously with the text described in the system, helping teachers to quickly write lesson plans for photovolt*c power generation courses and improve students' rapid mastery and learning of new energy professional knowledge.
4. Software composition
(1) Solar photovolt*c silicon material explanation and display system
M*n functions
1. Display the actual silicon materials used in various solar photovolt*c cells;
2. Equipped with text and animation to display the production process and usage methods of various materials
3. Contents (about 11 class hours)
Basic introduction to photovolt*c silicon products
Properties of silicon: including the physical properties, chemical properties, classification and application of silicon
Properties of silicon compounds: including silicon dioxide, silicon monoxide, silicon halides, trichlorosilane, silane, etc.
Growth principle and
shaping of silicon Silicon purification method: including chemical purification and physical purification methods
Preparation of polycrystalline silicon and its defects and impurities: including metallurgical silicon grade preparation, high-purity polycrystalline silicon preparation, casting polycrystalline silicon preparation
Preparation of single crystal silicon and its defects and impurities: including single crystal silicon growth, impurities and defects of single crystal silicon
Processing methods of single crystal silicon and polycrystalline silicon
Silicon thin film materials: including amorphous silicon thin film materials, polycrystalline silicon thin film
materials Testing and analysis methods for silicon materials: including conductivity model measurement, resistivity measurement, minority carrier lifetime measurement, Hall coefficient determination, mobility measurement, chemical performance analysis, crystal structure analysis, etc. Testing
and analysis of silicon materials based on standards (GB standard, UL standard, IEC standard, SEMI standard)
(2) Solar photovolt*c cell explanation and display system
M*n functions
1. Can display various solar photovolt*c cells;
2. Equipped with text and animation to display the production process and use methods of various cells
3. Catalog (about 9 class hours)
Basic introduction to solar cells
Basic structure analysis of solar cells
Classification of solar cells
Production process of crystalline silicon solar cells: including introduction to production methods and production equipment
M*n raw materials for the production of crystalline silicon solar cells
Testing technology and methods for solar cells: including introduction to test methods and test equipment
Testing based on standards for solar cells
(3) Solar photovolt*c module explanation and display system
1. Can display various solar photovolt*c modules;
2. Equipped with text and animation to display the production process and use methods of various photovolt*c modules
3. Catalog (about 10 class hours)
Basic introduction to solar cell modules
Classification of solar cell modules and advantages and
disadvantages Introduction to the production process of solar cell modules and related equipment
Evaluation standards for solar
cell modules Testing methods and equipment for
solar cell modules Development direction of solar cell modules
(4) Explanation and display system for auxiliary materials of solar photovolt*c modules
M*n functions
1. Display various auxiliary materials of solar photovolt*c modules;
2. Equipped with text and animation to display the production process and use methods of various auxiliary materials of photovolt*c modules
3. Contents (about 7 class hours)
Introduction to auxiliary facilities of solar modules
Specific requirements of solar modules for tempered glass Specific requirements of
solar modules for bracket aluminum profiles Specific requirements of
solar modules for EVA sealing glue Specific requirements
of solar modules for TPT backplane
Testing methods for auxiliary facilities of solar modules
Testing standards for auxiliary facilities of solar modules
* 2. Contents of display and explanation (with pictures, text and sound)
2.1 Explanation and display system for solar photovolt*c application products (about 5 class hours)
2.1.1 Solar power generation system:
2.1.2 Household solar generator DC system Multimedia TV
2.1.3 Solar portable power supply:
2.1.4 Solar insect killer lamp
2.1.5 Solar warning light
2.1.6 Solar camping light
2.2 Basic principles of solar photovolt*c power generation
2.3 Introduction to components of solar photovolt*c power generation system
2.4 Design method of solar photovolt*c power generation system
2.5 Construction method of solar photovolt*c power station
2.5.1 Preliminary investigation of the project
2.5.2. Preliminary information and approval documents for project construction.
Phase I: Feasibility study phase.
Phase II: Obt*n approval documents from relevant provincial/municipal departments.
Phase III: Obt*n construction permit.
2.5.3. Project construction drawing design.
2.5.4. Project implementation and construction .
2.5.5. Necessary conditions before power on.
2.6 Introduction to solar photovolt*c grid-connected power station.
2.6.1. Brief description of photovolt*c grid-connected power station.
2.6.2. Composition of photovolt*c grid-connected power station equipment.
2.6.2. Functions of photovolt*c grid-connected power station equipment.
2.7 Construction plan for household solar power station.
2.7.1. Project overview.
2.7.2. Scheme design (with det*led scheme design).
(I) User load information.
(II) System scheme design.
(III) Benefit calculation:
2.8 Introduction to basic principles of inverter.
2.9 Introduction to basic principles of controller.
(III) Laboratory smart power safety control
system. The intelligent power management system has seven major protection functions: over-temperature, short circuit, over-current, over-voltage, under-voltage, loss of pressure, and power limitation; the power supply has a one-button locking function to prevent the leakage protector from closing when handling faults, causing the risk of electric shock; the power supply has a fault locking function. When a fault occurs and the circuit breaker trips, it cannot be powered on manually. It can only be powered on successfully after the fault is cleared remotely; it can communicate with the mobile phone APP and PC cloud platform through wireless 4G and wired Ethernet. In the absence of a network, the entire intelligent power management system in the classroom can run independently offline.
1. Intelligent terminal: The intelligent power management system is based on 32-bit ARM as the core, and uses a 4.3-inch color touch screen as the human-computer interaction interface. It monitors the operation of the equipment in real time, provides multiple communication modes such as Zigbee and CAN, and has a voice broadcast function. It can monitor three-phase voltage, current, power, power factor, frequency, electric energy and other parameters in real time, and the LCD touch screen monitors the values. It can monitor the fault type and number of faults of the laboratory power supply; the equipment time management includes the display of the year, month, day and time; the user requests to turn on the equipment by swiping the card, and after the PC is authorized, the equipment can be started and used, and the PC can schedule the start and stop of the equipment in different time periods!
2. Mobile APP: The power status interface displays the current voltage, current, reactive power, electric energy, equipment temperature, leakage current value, etc. in real time; the power data interface can intelligently search for power data in the past two years, and the setting interface can set the limited electric energy value, load value, equipment over-temperature value, over-voltage and under-voltage value, over-voltage and under-voltage recovery time value, etc. Check the alarm log, operation log, fault log, etc. in the background. Control: The on and off of the smart switch can be remotely controlled in the WeChat applet.
3. PC software: Each device status information is displayed, with multiple sub-interfaces, fault analysis, power efficiency analysis, centralized management, personal center data management, user alarm location tracking and information statistics; it has functions such as administrator information modification and permission management. All devices can be turned on and off with one click, and the switch of each device can be controlled separately!
4. Backstage system: including account management, equipment management, rep*r management, user management, equipment management: ①, including monitoring management: real-time video monitoring of each classroom, one-click preview of all equipment online and running status, analyze equipment usage and running time! ②, including equipment nodes: can display equipment location, code name, mounting status, user editing, user query, etc.
5. Rep*r management: users can remotely report rep*rs, reflect equipment f*lure information, edit rep*r status, the background can perform remote m*ntenance, follow up in time, to effectively solve user equipment m*ntenance.
6. User management: can connect mobile phone numbers, one-to-one security encryption of accounts, real-name authentication, prevent account leakage, anti-theft, field data connection cloud platform background database management. VII
. Experiments and scientific research teaching content that can be opened
1) Wind turbine simulation experiment
2) Low voltage ride-through experiment
3) Low voltage ride-through algorithm research
4) DC bus voltage control experiment
5) Grid connection process and continuous experiment
6) Subsynchronous speed and supersynchronous speed operation control experiment
7) Wind power grid-connected power factor regulation
experiment project table
|
serial number |
name |
Student number |
type |
|
1 |
Asynchronous motor no-load test |
3~5 people per unit |
Design |
|
2 |
Asynchronous motor load test |
3~5 people per unit |
Design |
|
3 |
No-load experiment of double-fed induction motor |
3~5 people per unit |
Design |
|
4 |
Doubly-fed induction motor load test |
3~5 people per unit |
Design |
|
5 |
Wind turbine start-up and grid connection experiment |
5~8 people per unit |
Design |
|
6 |
Normal shutdown test of wind turbine |
5~8 people per unit |
Design |
|
7 |
Abnormal shutdown of wind turbine |
5~8 people per unit |
Design |
|
8 |
Wind turbine normal operation test |
5~8 people per unit |
Design |
|
9 |
Wind turbine off-grid protection experiment |
5~8 people per unit |
Design |
1. Product Overview
This experimental system uses a double-fed asynchronous generator set with variable speed constant frequency control, which can complete the wind turbine simulation and operation tr*ning of high-power double-fed wind turbine sets.
II. Product Features
1) Simulate the start-up, grid connection, normal operation and shutdown process of real wind turbines, and have the ability to simulate the speed adjustment of the unit, and the ability to adjust active and reactive power;
2) The wind speed model can not only set several typical wind speed curves, but also support the import of wind speed-time data obt*ned by actual measurement;
3) FaceView experimental m*n control software performs unit operation status process control and data recording, display, system monitoring and other functions;
4) Realize wind speed and wind turbine simulation, unit grid connection control, unit maximum power operation control, unit constant speed operation, unit power limit operation, unit low voltage ride-through, unit off-grid control and other control functions;
5) The back-to-back converter can realize the initial state of the DC side voltage setting, realize the unity power factor grid connection, realize the wind turbine under fault conditions without off-grid operation, low voltage ride-through function, and support the low voltage ride-through experiment of the wind turbine;
6) The software analyzes the data and operating characteristics of wind power generation, and can display the cause of the abnormal fault;
7) RS485 interface, providing open MODBUS protocol access monitoring system;
8) Complete protection functions, including overvoltage protection, overcurrent protection, overtemperature protection, overspeed protection, and short circuit protection, which can realize low voltage ride-through and protection experiments when the external power supply voltage is unstable;
Note: with eye-catching danger signs, such as: there is electrical danger, do not open during operation, and strictly operate with power on.
2. System operation technical parameters
2.1 Working conditions
Input voltage: three-phase four-wire ~ 380V ± 10% 50Hz
Device capacity: ≤5.0kW
Altitude: 0 ~ 2000m;
Ambient temperature: -10℃ ~ +50℃;
Ambient relative humidity: 10 ~ 90% (25℃);
Atmospheric pressure range: 1 standard atmospheric pressure range;
Indoor installation;
The platform must be installed horizontally;
Normal service life of the equipment: ≥ 20 years;
Environmental requirements: The environment is well ventilated and does not cont*n flammable or corrosive gases;
2.2 Basic dimensions of the experimental platform:
Experimental table: 1400×400×400; (length × depth × height, mm)
Converter: 800×800×2000;
M*n control cabinet: 800×800×2000;
Note: The experimental platform is arranged in two rows, with an estimated area of 4m×4m
2.2 Customized double-fed converter
system Wind power converters include double-fed wind turbine converters, full-power converters and PWM rectifiers, all of which are independently developed by our company and customized according to the requirements of colleges and research institutes. They have the characteristics of complete functions, reliable products, strong openness, strict protection, etc.
The converter that simulates the wind power generation system is realized by AC-DC-AC PWM converter. The front-stage AC input can be optionally connected to the AC/DC grid. According to the set wind speed, the corresponding energy is injected into the DC bus. The rear-stage AC output is connected to the AC bus to inject the input energy into the distribution/microgrid. The converter is a customized product designed according to user requirements, with the following functional features:
machine-side vector control, grid-side vector decoupling P/Q control;
normal operation when the grid voltage fluctuates within the range of -3% to +7%;
total harmonic distortion rate of grid-connected full-load current is less than 5%;
overcurrent/overvoltage/overtemperature protection, divided into hardware protection and software protection;
low voltage ride-through function;
interface for connecting other electrical equipment on the DC side;
support normal power generation operation when the grid imbalance is less than 10%;
support a wide operating speed range: 700-2000RPM;
5.0 kW back-to-back converter m*n indicators
|
Project indicators |
Parameter characteristics |
Project indicators |
Parameter characteristics |
|
Converter topology |
Double level back to back |
Post-stage control method |
Stabilize DC voltage |
|
Rated flow power |
5.0kW |
Post-stage power factor |
>0.99 |
|
Rated AC current |
15A |
DC bus voltage |
600V |
|
Rated AC voltage |
380V |
Maximum DC current |
22A |
|
Rated grid frequency |
50Hz |
Current total harmonic distortion (THD) |
<3% (rated power) |
|
Allowable grid frequency |
48～50.5Hz |
Maximum efficiency |
95% |
|
Pre-stage control method |
Power Control |
Standby power consumption |
<40W |
|
Pre-stage power factor |
>0.99 |
cooling method |
Forced *r cooling |
|
Protection level |
IP21 |
Standard communication method |
RS485 |
2.3 M*n configuration parameters of the device
|
Drive inverter |
Capacity rating |
5.5KW |
|
Voltage level |
380V |
|
Motor Type |
Asynchronous/Permanent Magnet Synchronous Motor |
|
Speed range |
0-2000RPM |
|
control method |
With PG vector control, weak magnetic control |
|
Interface Type |
RS485 |
|
Control loop |
Speed closed loop, torque closed loop |
|
Accuracy |
Signal measurement of voltage, current, speed, position and torque |
|
Customized converter |
Power level |
5.5KW |
|
Voltage level |
380V |
|
Power Topology |
Two-level back-to-back |
|
Dimensions |
(width × depth × height, mm) 800 × 600 × 1600 |
|
Electric Motor |
rated power |
5.5KW |
|
Rated speed |
1500RPM |
|
Synchronous speed |
1800RPM |
|
Rated voltage |
380V |
|
Power Factor |
0.9 |
|
dynamo |
type |
Doubly-fed generator |
|
rated power |
5.0kW |
|
Rated voltage |
380V |
|
Rated frequency |
50Hz |
|
Rated speed |
1500rpm |
|
range of rotation |
0-2000rpm |
|
Insulation class |
F-Class |
3. Low voltage ride-through and experiment of doubly-fed system
3.1 Hazards of grid voltage drop
For doubly-fed wind turbines:
the overcurrent will damage power electronic devices;
the overvoltage at the DC end will threaten the components on the DC side;
the additional torque and excessive stress will damage the mechanical parts of the wind turbine;
for the power grid:
it will cause the grid frequency to decrease;
it will cause the grid line voltage to decrease;
it will trigger an interlocking effect, leading to large-scale grid paralysis.
3.2 Definition and significance of low voltage ride-through LVRT
When the voltage at the wind farm grid connection point drops due to a grid fault or disturbance, the wind turbine can be connected to the grid uninterruptedly within the range of the voltage drop.
It has a relatively important significance to the system:
the wind turbine can continue to operate without disconnecting from the grid;
it can provide dynamic reactive power Q support to the grid;
it helps to restore active power P;
3.3 Domestic low voltage ride-through standard
For low voltage ride-through, the requirements are as shown in the figure below, and the solution fully complies with this standard:
when the grid connection point voltage drops to 20% of the rated voltage, it is guaranteed to operate continuously for 625ms without disconnecting from the grid;
when it recovers to 90% of the rated voltage within 2s after the drop, it continues to operate without disconnecting from the grid.
Reactive support: response time is no more than 75ms, duration is no less than 550ms; reactive current meets IT≥1.5×(0.9-UT)IN, (0.2≤UT≤0.9)
Active recovery: after fault removal, the power is restored to the power before the fault drop at a rate of at least 10% of the rated power/second;
3.4 Introduction to the LVRT experimental scheme
M*nly to add Crowbar and Chopper circuits to the converter, and perform corresponding control in the converter:
Crowbar: It has a short response time and can protect the converter IGBT, absorb and attenuate distortion current and harmonic current
Chopper: M*nly consider the design of the single-tube absorption circuit. Different from the switching working mode of Crowbar, the Chopper device will perform a chopping action of about 100Hz during operation. The peak when the large current is turned off can easily cause the IGBT to over-voltage f*lure. Therefore, the RCD absorption circuit and low-inductance power circuit are designed.
4. Double-fed system experiment m*n control software
FaceView experiment m*n control software has wind speed characteristic simulation and wind turbine m*n control function, which can simulate several typical wind speeds such as: breeze, gust, continuous strong wind, continuous medium wind, or four wind speed synthesis characteristics. The parameter modification authority of the m*n control and wind turbine simulation is open to users. Users can freely customize the characteristics of wind turbines and receive actual anemometer data. The m*n control function realizes the grid-connected control of the unit, constant speed operation, power limit operation, power reduction operation, low voltage ride-through, and unit off-grid control.
FaceView monitors the following parameters:
wind speed, wind wheel speed;
drive motor rotor position/speed, current, voltage, power, output torque;
generator rotor position/speed, current, voltage, power, output torque;
converter DC voltage;
grid-side converter output voltage, current, power;
grid voltage, current, power.
5. Open double-fed wind power converter system (description)
The algorithm class function is open, and users can modify and call it according to their own algorithms, such as rectification, inversion, SVPWM of motor control and low voltage ride-through algorithm.
The open content is as follows:
1) Hardware schematics and BOM lists of all circuit boards of the doubly-fed converter (pdf version): control board, power board, signal board, capacitor board;
2) Electrical schematics and BOM lists of the doubly-fed converter cabinet (pdf version);
3) Open the debug interface of the control board, and customers can burn their own programs;
4) Communication protocol of the doubly-fed converter (RS485) (free);
5) User manual of the doubly-fed converter (free);
6) Doubly-fed converter programming manual pdf version;
Engineering source files of the doubly-fed converter software low voltage ride-through algorithm, rectifier SVPWM algorithm and motor control SVPWM algorithm, including the m*n framework of the program, hardware driver function, hardware configuration function, communication function, protection function, encoder function, sampling function, phase-locked loop function, filter function, etc. Users can modify and call the low voltage ride-through algorithm, rectifier SVPWM algorithm and motor control SVPWM algorithm.
VI. Supporting teaching resources (1 set in total)
(I) Online education course open platform:
1) This system is a diversified management platform for interoperable teaching. It integrates the traditional platforms of users and centralizes interoperable management to solve the problems of multi-platform and multi-account management and the inability to centrally count the scattered databases. The system includes: online teaching management system, online course resource management platform, online question bank platform, online examination and assessment platform, online video course management platform and online virtual simulation teaching management platform, which is a truly one-stop interoperable data centralized statistics!
(II) New energy teaching system simulation software
I. Software Overview1
. Through this software, you can systematically learn all series of photovolt*c knowledge content such as solar photovolt*c silicon materials, battery cells, photovolt*c modules, photovolt*c module auxiliary materials, photovolt*c application products, etc.
2. Equipped with text and animation to display and introduce the processing technology from raw materials to finished products, including intermediate links, etc. and how to use them.
3. The multimedia system comes with voice explanation, which displays explanations with pictures, texts and sounds, and plays synchronously with the text described by the system, helping teachers to quickly write lesson plans for photovolt*c power generation courses and improve students' rapid mastery and learning of new energy professional knowledge.
4. Software composition
(1) Solar photovolt*c silicon material explanation and display system
M*n functions
1. Display the actual silicon materials used in various solar photovolt*c cells;
2. Equipped with text and animation to display the production process and usage methods of various materials
3. Contents (about 11 class hours)
Basic introduction to photovolt*c silicon products
Properties of silicon: including the physical properties, chemical properties, classification and application of silicon
Properties of silicon compounds: including silicon dioxide, silicon monoxide, silicon halides, trichlorosilane, silane, etc.
Growth principle and
shaping of silicon Silicon purification method: including chemical purification and physical purification methods
Preparation of polycrystalline silicon and its defects and impurities: including metallurgical silicon grade preparation, high-purity polycrystalline silicon preparation, casting polycrystalline silicon preparation
Preparation of single crystal silicon and its defects and impurities: including single crystal silicon growth, impurities and defects of single crystal silicon
Processing methods of single crystal silicon and polycrystalline silicon
Silicon thin film materials: including amorphous silicon thin film materials, polycrystalline silicon thin film
materials Testing and analysis methods for silicon materials: including conductivity model measurement, resistivity measurement, minority carrier lifetime measurement, Hall coefficient determination, mobility measurement, chemical performance analysis, crystal structure analysis, etc. Testing
and analysis of silicon materials based on standards (GB standard, UL standard, IEC standard, SEMI standard)
(2) Solar photovolt*c cell explanation and display system
M*n functions
1. Can display various solar photovolt*c cells;
2. Equipped with text and animation to display the production process and use methods of various cells
3. Catalog (about 9 class hours)
Basic introduction to solar cells
Basic structure analysis of solar cells
Classification of solar cells
Production process of crystalline silicon solar cells: including introduction to production methods and production equipment
M*n raw materials for the production of crystalline silicon solar cells
Testing technology and methods for solar cells: including introduction to test methods and test equipment
Testing based on standards for solar cells
(3) Solar photovolt*c module explanation and display system
1. Can display various solar photovolt*c modules;
2. Equipped with text and animation to display the production process and use methods of various photovolt*c modules
3. Catalog (about 10 class hours)
Basic introduction to solar cell modules
Classification of solar cell modules and advantages and
disadvantages Introduction to the production process of solar cell modules and related equipment
Evaluation standards for solar
cell modules Testing methods and equipment for
solar cell modules Development direction of solar cell modules
(4) Explanation and display system for auxiliary materials of solar photovolt*c modules
M*n functions
1. Display various auxiliary materials of solar photovolt*c modules;
2. Equipped with text and animation to display the production process and use methods of various auxiliary materials of photovolt*c modules
3. Contents (about 7 class hours)
Introduction to auxiliary facilities of solar modules
Specific requirements of solar modules for tempered glass Specific requirements of
solar modules for bracket aluminum profiles Specific requirements of
solar modules for EVA sealing glue Specific requirements
of solar modules for TPT backplane
Testing methods for auxiliary facilities of solar modules
Testing standards for auxiliary facilities of solar modules
* 2. Contents of display and explanation (with pictures, text and sound)
2.1 Explanation and display system for solar photovolt*c application products (about 5 class hours)
2.1.1 Solar power generation system:
2.1.2 Household solar generator DC system Multimedia TV
2.1.3 Solar portable power supply:
2.1.4 Solar insect killer lamp
2.1.5 Solar warning lights2.1.6
Solar camping lights2.2
Basic principles of solar photovolt*c power generation2.3
Introduction to components of solar photovolt*c power generation
system2.4 Design methods of solar photovolt*c power generation system2.5
Construction methods of solar photovolt*c power station2.5.1
Preliminary project investigation2.5.2
Preliminary project construction materials and approval documentsPhase
I: Feasibility study stage
Phase II: Obt*n approval documents from relevant provincial/municipal departments
Phase III: Obt*n construction permit
2.5.3. Project construction drawing design
2.5.4. Project implementation and construction
2.5.5. Necessary conditions before power on
2.6 Introduction to solar photovolt*c grid-connected power station
2.6.1. Brief description of photovolt*c grid-connected power station
2.6.2. Composition of photovolt*c grid-connected power station equipment
2.6.2. Functions of photovolt*c grid-connected power station equipment
2.7 Construction plan for household solar power station
2.7.1. Project overview
2.7.2. Scheme design (with det*led scheme design)
(I) User load information
(II) System scheme design
(III) Benefit calculation:
2.8 Introduction to the basic principle of inverter
2.9 Introduction to the basic principle of controller
(III) Laboratory smart power safety control
system The intelligent power management system has seven major protection functions: over-temperature, short circuit, over-current, over-voltage, under-voltage, loss of pressure, and power limitation; the power supply has a one-button locking function to prevent the leakage protector from closing when handling faults, causing the risk of electric shock; the power supply has a fault locking function. When a fault occurs and the circuit breaker trips, it cannot be powered on manually. It can only be powered on successfully after the fault is cleared remotely; it can communicate with the mobile phone APP and PC cloud platform through wireless 4G and wired Ethernet. In the absence of a network, the entire intelligent power management system in the classroom can run independently offline.
1. Intelligent terminal: The intelligent power management system is based on 32-bit ARM as the core, and uses a 4.3-inch color touch screen as the human-computer interaction interface. It monitors the operation of the equipment in real time, provides multiple communication modes such as Zigbee and CAN, and has a voice broadcast function. It can monitor three-phase voltage, current, power, power factor, frequency, electric energy and other parameters in real time, and the LCD touch screen monitors the values. It can monitor the fault type and number of faults of the laboratory power supply; the equipment time management includes the display of the year, month, day and time; the user requests to turn on the equipment by swiping the card, and after the PC is authorized, the equipment can be started and used, and the PC can schedule the start and stop of the equipment in different time periods!
2. Mobile APP: The power status interface displays the current voltage, current, reactive power, electric energy, equipment temperature, leakage current value, etc. in real time; the power data interface can intelligently search for power data in the past two years, and the setting interface can set the limited electric energy value, load value, equipment over-temperature value, over-voltage and under-voltage value, over-voltage and under-voltage recovery time value, etc. Check the alarm log, operation log, fault log, etc. in the background. Control: The on and off of the smart switch can be remotely controlled in the WeChat applet.
3. PC software: Each device status information is displayed, with multiple sub-interfaces, fault analysis, power efficiency analysis, centralized management, personal center data management, user alarm location tracking and information statistics; it has functions such as administrator information modification and permission management. All devices can be turned on and off with one click, and the switch of each device can be controlled separately!
4. Backstage system: including account management, equipment management, rep*r management, user management, equipment management: ①, including monitoring management: real-time video monitoring of each classroom, one-click preview of all equipment online and running status, analyze equipment usage and running time! ②, including equipment nodes: can display equipment location, code name, mounting status, user editing, user query, etc.
5. Rep*r management: users can remotely report rep*rs, reflect equipment f*lure information, edit rep*r status, the background can perform remote m*ntenance, follow up in time, to effectively solve user equipment m*ntenance.
6. User management: can connect mobile phone numbers, one-to-one security encryption of accounts, real-name authentication, prevent account leakage, anti-theft, field data connection cloud platform background database management. VII
. Experiments and scientific research teaching content that can be opened
1) Wind turbine simulation experiment
2) Low voltage ride-through experiment
3) Low voltage ride-through algorithm research
4) DC bus voltage control experiment
5) Grid connection process and continuous experiment
6) Subsynchronous speed and supersynchronous speed operation control experiment
7) Wind power grid-connected power factor regulation
experiment project table
|
serial number |
name |
Student number |
type |
|
1 |
Asynchronous motor no-load test |
3~5 people per unit |
Design |
|
2 |
Asynchronous motor load test |
3~5 people per unit |
Design |
|
3 |
No-load experiment of double-fed induction motor |
3~5 people per unit |
Design |
|
4 |
Doubly-fed induction motor load test |
3~5 people per unit |
Design |
|
5 |
Wind turbine start-up and grid connection experiment |
5~8 people per unit |
Design |
|
6 |
Normal shutdown test of wind turbine |
5~8 people per unit |
Design |
|
7 |
Abnormal shutdown of wind turbine |
5~8 people per unit |
Design |
|
8 |
Wind turbine normal operation test |
5~8 people per unit |
Design |
|
9 |
Wind turbine off-grid protection experiment |
5~8 people per unit |
Design |
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