几种双馈式变速恒频风电机组低电压穿越技术对比分析

Contrast About Several Low Voltage Ride-through Techniques for Wind Turbines Using Doubly-fed Induction Machines

新电网运行规则要求风力发电机组在电网故障出现电压跌落的情况下不脱网运行,并在故障切除后能尽快帮助电力系统恢复稳定运行,要求风电机组具有一定低电压穿越能力。由于双馈感应发电机(DFIG)励磁变换器容量有限,电网故障时会产生转子过电流和变换器直流环节过电压.须实行保护和控制。本文对国内外学术界和工程界对电网故障时双馈感应发电机的保护原理与控制策略进行了大量研究。以便具体设计时根据要求合理选择。

The new power network running ruler request that wind turbines Induction machines do not divorce itself from power network when network＇s voltage declines, Wind Turbines Induction Machines should help power system come back to stabilization if the trouble vanished, Wind Turbines Induction Machines should have low voltage ridethrough ability. Because of doubly-fed induction machine＇s excitation convertor＇s limited capacity, rotor over current and convertor direct current tache＇s over voltage will happen when power network has trouble, so measures must be taked to protect the excitation convertor. This article did a lot of research about Doubly-Fed Induction Machines＇ protect principle and control strategy under the power network＇s trouble, We can easily choose reasonable scheme base on this article.