紧急变桨与撬棒协调控制改善双馈风电机组低电压穿越能力

摘要

针对撬棒保护电路技术存在的问题,介绍了一种快速变桨控制技术和撬棒保护电路技术协调的控制方法,利用该方法不仅能够限制双馈机组转子过电流,还能够抑制其转速的快速增加,从而防止机组过速跳闸,改善系统转速稳定性,确保双馈风电机组成功穿越电网电压跌落故障.利用仿真软件MATLAB/Simulink,完成了基于2个不同时间尺度的电压故障条件下的仿真实验.仿真实验结果验证了所提故障穿越方案的有效性,尤其是对于较长时间的电压故障,故障穿越能力提高的效果更为明显.%A scheme of coordination between pitch control and Crowbar control is presented,which prevents the over-speed trip, improves the system speed stability and ensures the low-voltage ride-through of DFIG (Doubly Fed Induction Generator) wind turbines by limiting the over current of rotor and suppressing the rapid increase of its speed. Simulative experiments are performed with MATLAB/Simulink for two voltage faults with different time durations and results show that the enhancement of ride-through capability is more obvious for long time voltage fault, verifying the validity of the proposed ride-through scheme.