计及主网不同电压跌落影响的分布式电源特性研究

Research on Characteristics of Distributed Generation Under the Influence of Different Voltage Drop in Main Grid

基于双馈感应风力发电机分布式电源,通过设置故障点不同数值过渡电阻研究电网不同程度电压跌落时分布式电源的响应特性,指出此研究过程分电压跌落与电压恢复两部分,电压跌落时,风机转子侧易产生过电压和过电流的危险,严重时将损坏转子侧变流器;电压恢复阶段,双馈风机需从电网吸收大量无功功率,且恢复时间较长,在系统无功储备不足的情况下,很容易导致系统电压失稳。

Based on doubly-fed inductive generator distributed generation,this paper studies the response characteristics of the wind-turbine under different levels of voltage drop by changing transition resistance. The research is divided into two parts： voltage drop and voltage recovery,during the process of voltage drop,over-current and over-voltage danger on rotor side will occur,therefore,it is harmful to power electronic devices when voltage drops seriously. In voltage recovery process,wind-turbine needs to absorb more reactive power from the main grid and takes long time to recover itself. Therefore,it will cause voltage instability as the reactive power of the main grid is insufficient.