双馈风力发电系统网侧低电压穿越控制策略研究

Research of the Rotor-side low voltage dip control strategy about doubly-fed wind power generator system

电网电压跌落是电网常见的故障之一,其会为风电机组的安全持续运行和维持电网的稳定埋下极大的安全隐患。为了解决此问题,论文简述了风力发电机组网侧变流器实现低电压穿越的现实技术方案,分析了电网电压跌落时直流母线电压波动机理,改进了网侧变流器实现低电压穿越的技术方案—前馈控制策略。仿真表明,文中设计的改进方案相较传统方案能减小了直流母线电压的波动,能使系统迅速恢复稳态。

The voltage dip is a kind of common fault in power grid,which is a huge security hidden and threats the stable running of the wind power system and grid voltage stability.In order to solve this problem,In order to solve this problem,the paper introduces the practical technical scheme of low-voltage ride through about the grid-side converter of wind power generator,and analyzes the cause of DC bus voltage fluctuation.Then the scheme of low-voltage ride through,the feed forward control strategy,are designed.Simulation results show that the improved scheme designed can reduce the DC bus voltage fluctuation,and enables the system to quickly restore homeostasis.