WINGREEN's pitch system product range covers low-temperature type (down to -40℃), high-altitude type (up to 4000m) and intertidal zone type, which can be applied in harsh environments including low-temperature areas in Inner Mongolia, high-humidity and high-altitude areas in Yunnan and Guizhou, and coastal areas in Nantong and Yancheng.

Power Class

Drive

Motor

Back-up source

1.5MW

DC drive

/Low-voltage AC drive

/High-voltage AC drive

DC series excitation

/Communication

/AC asynchronous

Battery pack/

Super-capacitor bank

2.0MW

2.5MW

High-voltage AC drive

/Low-voltage AC drive

Ac servo

/AC asynchronous

Super-capacitor bank

3.0MW

5.0MW

High-voltage AC drive

Ac servo

Super-capacitor bank

Features of WINGREEN Series Pitch Control System


1. Software and hardware double safety chain circuit
Software safety chain control circuit: Fault points such as system communication fault, internal fault of pitch PLC, pitch overspeed signal, encoder hopping, and charger fault are connected in series inside the software to form a safety chain circuit for safety protection.
Hardware safety chain control circuit: Fault points such as master control EFC signal and driver status signal feedback are connected to form a safety chain circuit for safety protection.

2. Optimized emergency feathering control
In case of normal operation of pitch controller PLC and AC power supply: The controller PLC controls the driver to retract the blades according to a predetermined curve. It can reduce the speed in advance when approaching the limit switch to reduce the load of the unit.
In case of abnormal operation of controller PLC and AC power supply: The wind turbine automatically switches to the super-capacitor bank of back-up source to power the driver, and drives the pitch motor to retract the blades according to the built-in retracting curve until it reaches the limit switch.

3. Built-in UPS power supply mode
24VDC UPS is built in pitch control system, and redundant switching power supply is designed to realize seamless switching between AC power supply and DC back-up source.

4. Sophisticated fault record diagnosis
The pitch controller PLC can record and save the fault codes, parameters, operation curves and other information of the pitch system in real time, and can quickly and accurately troubleshoot and deal with the faults during the overhaul and maintenance of the system.

5. Abundant and friendly debugging interface
The pitch control HMI debugging interface has the advantages of functionality, intuition and accuracy. It can implement customized functions, and carry out debugging and detection, parameter modification and maintenance, troubleshooting and other operations on the pitch control system.

6. Superior equipment performance
u    Position steady-state error: ≤ 0.02
u    Position dynamic response delay: ≤100ms
u    Normal pitch tracking deviation: ≤2
u    Control mode: Position control or speed control

7. Modular and integrated design
The pitch control system is optimized and integrated by control module, driver module, and charging management module, so as to reduce maintenance problems.