电网故障下风力发电系统网侧电压同步信号检测

Synchronizing Signal Detection of Grid Voltage in Wind Power Generation Systems Under Grid Faults

风力发电系统网侧变换器的并网性能依赖于高性能的同步检测系统,尤其是在电网电压故障情况下快速而准确地提取同步信号。在双同步参考坐标系下提出一种基于二阶广义积分器(SOGI)的新型锁相环,消除了dq变换中电网电压不平衡和低次谐波产生的2倍频和谐波变换交流分量带来的影响,实现了对基波电压同步信号的检测。MATLAB仿真和试验结果表明:该方法能快速有效地实现对基波电压正、负序分量以及电压频率、相位的提取。

The grid-connected performance of grid-side converters in wind power generation system depends on high-performance synchronous detection system,the quick and accurate extraction of synchronizing signal under power grid fault in especial.A novel phase locked loop based on second-order generalized integrator(SOGI)is proposed,which eliminates the influence of the unbalanced and distorted grid voltage in the dq transform,as well as that of the second-order and higher order harmonic components,realizing the detection of synchronizing signal of the fundamental voltage.MATLAB simulation and experimental results show that the frequency,phase angle and positive and negative sequence components can be obtained quickly and efficiently.