Fault protection method for wind turbine generator variable pitch system without independent controller

Abstract

Provided is a fault protection method for a wind turbine generator variable pitch system without an independent controller. Three-shaft blades of the wind turbine generator variable pitch system are respectively controlled by independent servo drives. The three-shaft servo drives are communicated with a wind turbine generator main control system by means of a CANopen network to realize a data exchange. The three-shaft blade servo drivers collect a piece of information of each shaft to determine the operating status of a device. When the status of the device is abnormal, the fault is triggeredand the fault flag bit is uploaded to the main control system. The wind turbine generator main control system sends an emergency feathering command so as to control each blade to execute the emergencyfeathering.

Description

technical field [0001] The invention relates to a fault protection method for a pitch control system of a wind power generating set without an independent controller. Background technique [0002] With economic development, population growth, and people's life gradually becoming modernized, people's demand for energy is increasing significantly. At present, the main sources of energy are oil, coal, and natural gas, and these energy sources are non-renewable energy sources. The excessive use of these energy sources has caused severe environmental pollution. In recent years, severe smog has appeared in various cities across the country. This problem has caused local governments and The people attach great importance to it, and the fundamental solution to the problem of environmental pollution lies in finding clean and renewable energy. [0003] As a highly efficient, clean and renewable energy, wind energy has been paid more and more attention by countries all over the world....

AI Technical Summary

Problems solved by technology

[0010] The protection strategies of the above protection methods are relatively simple. When special faults, such as driver faults, encoder faults, motor overspeed, etc., occur, the protection strategies may fail. The failure reasons are analyzed as follows:

[0011] Drive failure: After the drive fails, the IGBT pulse will be blocked and the torque output will be stopped. At this time, the blade controlled by the drive cannot perform feathering

[0012] Encoder failure: When the encoder fails, position or speed closed-loop control cannot be performed, and the conventional feathering method fails. In this state, the state of the blade is unpredictable. Similarly, the unit is in a dangerous state, and there are great hidden dangers;

[0013] Motor overspeed fault: When the motor is overspeed, the propeller is in an uncontrollable state. If the conventional method is used to continue feathering, it may cause the propeller to fly

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