不对称故障下永磁风电系统低电压穿越技术  

A Low Voltage Ride-through Control Strategy for Permanent Magnet Wind Power Generation System under Unbalanced Voltage Dips

作　　者：郑荣美[1] 朱凌[1] 张丽荣[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071000

出　　处：《电测与仪表》2013年第3期20-23,共4页Electrical Measurement & Instrumentation

摘　　要：针对永磁风电系统,为提高其不对称故障下的低电压穿越能力,提出把网侧变流器输出的有功功率信号引入发电机侧来限制发电机的输出功率,降低直流侧过电压的控制策略;在网侧变流器增加负序电压前馈以实现不对称故障下并网电流的三相对称,并根据电网电压的跌落深度迅速发出无功功率,提升网侧电压。基于MATLAB/Simulink搭建了仿真平台,仿真结果表明该控制策略的有效性。The control strategies for generator-side converter and grid-side converter for the permanent magnet direct-driven wind power generation system are analyzed. The active power of grid-side converter is introduced to generator in order to limit the electromagnetic power of the generator and decrease the DC-link over-voltage. The grid-side converter exports reactive power rapidly to increase the grid-side voltage. Simulations are carried out using MATLAB/Simulink 7.10 and the simulation results verify the effectiveness and feasibility of the proposed control strategies.

关 键 词：风力发电 永磁同步发电机(PMSG) 低电压穿越(LVRT) 不对称跌落 

分 类 号：TM614[电气工程—电力系统及自动化]