基于18相风力发电系统容错控制策略研究

Research on Fault-Tolerant Control Strategy for 18-Phase Wind Power Generation System

针对一种18相风力发电系统的绕组结构特点,对多相风机的故障工况进行了分析,多相电机系统可能出现的故障可以直接看作开路故障,等效为电机的缺相运行。通过分析机侧、网侧能量传输机理,对系统中绕组开路及变流模块故障后的三相不控整流器的输出电流参考值进行重新整定,提出相应的容错控制方法。最后,通过仿真对变流模块故障的电流重分配控制策略及直流短路故障控制策略的有效性进行了验证。

Based on the winding structure characteristics of an 18 phase wind power generation system,the fault conditions of a multi-phase wind turbine are analyzed.The faults that may occur in the multi-phase motor system can be directly regarded as open circuit faults,equivalent to the phase loss operation of the motor.By analyzing the mechanism of energy transmission on the grid side and the machine side,the reference value of the output current of the three-phase uncontrolled rectifier after winding open circuit and converter module fault in the system has been readjusted,and corresponding fault-tolerant control methods have been proposed.Finally,the effectiveness of the current redistribution control strategy for converter module faults and the DC short circuit fault control strategy is verified through simulation.