永磁同步风电系统网侧单周期控制研究

Study on One-Cycle Control of Grid-Side Inverter for PMSG Wind Power System

对单周期控制进行了理论分析,进而提出了基于单周期控制的直驱永磁同步风力发电系统全功率换流器网侧控制策略.该方法采用输出电压作为参考量,输出电流作为积分量,实现输出电流跟踪输出电压,以达到自适应功率因数校正的目的,且能有效抑制直流母线电压波动给输出电压带来的影响,提高了永磁同步风电系统的低电压运行能力.就其控制策略在PSCAD/EMTDC中创建了仿真模型,仿真结果表明了单周期控制策略的正确性和有效性.

This paper analyzes a principle of one-cycle control, and proposes a one-cycle control for fully rated converter of permanent magnet synchronous generator （PMSG）wind power system on grid-side. With the output current as integral reference and grid voltage as the comparative reference,the output current is always tracking the output voltage. It aims to automatically adjust power factor and can effectively inhibit DC bus voltage fluctuation from impacting output voltage,and to improve low voltage ride-through（LVRT） capability of PMSG wind power system. The model and its control strategy are created in PSCAD/EMTDC. The simulation results show the correctness and validity of one-cycle control strategy.