直驱式PMSG风力发电系统LVRT分段控制研究

Stage Control of LVRT for Direct-drive PMSG Wind Power Generation System

选择PMSG风力发电系统作为研究对象,对网侧逆变器的功率暂态过程进行分析.通过功率解耦控制对故障时的逆变器进行控制策略修正,并配合撬棒电路进行耗能.提出一种基于变流器和撬棒电路分阶段控制的永磁同步发电机风力发电系统低电压穿越技术,对控制策略进行仿真分析验证.结果表明,在1200 kV直流输电系统发生电压跌落故障时,控制策略能将直流母线电压维持在额定电压附近.

PMSG wind power generation system is selected as the research subject to analyze the power transient process of a grid-side inverter.Power decoupling control is used to correct the control strategy of the inverter when it fails,and cooperates with crowbar circuit to consume energy.A PMSG wind power generation system LVRT technology based on the phased control of the converter and the crowbar circuit is proposed.Simulation analysis shows that the control strategy can maintain the DC bus voltage near the rated voltage when a voltage drop fault occurs in the 1200 kV DC transmission system.