为提高九开关变换器直流侧电压利用率,减少开关损耗,采用一种不连续空间矢量脉宽调制（DSVPWM）,同时将九开关变换器用于直驱式永磁同步风力发电机（PMSG）网侧构成并联型网侧九开关变换器（GS-NSC）。在对并联型GS-NSC控制策略、故障穿越方案进行理论分析的基础上,建立PMSG并联型GS-NSC仿真模型,设计多种电网电压故障工况对其进行仿真研究。结果表明,在电网电压正常工况下,并联型GS-NSC可维持电网电流的正弦波特性。在电网电压跌落工况下,并联型GS-NSC可向电网注入无功电流辅助电网电压的恢复,并通过提升并网电流幅值减少卸荷电路的功率损耗,降低PMSG散热负担。在电网电压骤升工况下,并联型GS-NSC可动态分配直流母线电压,避免因直流侧过压而导致PMSG退出运行。
Abstract
In order to improve the utilization of the DC side voltage of the nine-switch converter and reduce the switching loss, a discontinuous space vector pulse width modulation（DSVPWM） is proposed. At the same time, the nine-switch converter is used in the direct-driven wind turbine with permanent-magnet synchronous generator（PMSG） on the grid side to form a parallel grid-side nine-switch converter（GS-NSC）. Based on the theoretical analysis of the parallel GS-NSC control strategy and fault ride-through scheme, a PMSG parallel GS-NSC simulation model is established, and a variety of power grid voltage fault conditions are designed for simulation research. The results show that the parallel GS-NSC can maintain the sine wave characteristics of the grid current under normal working conditions of the grid voltage. Under the condition of power network voltage plummeting, the parallel GS-NSC can inject reactive current into the grid to assist the recovery of the grid voltage, and reduce the power loss of the unloading circuit by increasing the grid-connected current amplitude and reduce the PMSG's heat dissipation burden. Under the condition of voltage surge, the parallel GS-NSC can dynamically distribute the DC bus voltage to avoid the PMSG from exiting operation due to overvoltage on the DC side.
关键词
风力涡轮机 /
电力变流器 /
电能质量 /
不连续空间矢量脉宽调制 /
故障穿越
Key words
wind turbines /
electric converters /
power quality /
discontinuous space vector pulse width modulation /
fault ride through
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基金
国家自然科学基金（51967016; 51567020）; 内蒙古自治区科技重大专项（2019ZD027）; 内蒙古自治区科技计划（201802035）
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