摘要
针对双馈风力发电机在电压大幅骤降时投入Crowbar电路后引起直流侧过电压和动态无功补偿的问题,基于反馈线性化理论,提出了对网侧变频器进行非线性控制策略。通过协调控制STATCOM对电网进行动态无功补偿。仿真表明:网侧非线性控制器在电压骤降过程中能很好地抑制直流侧过电压;通过引入STATCOM补偿装置,很好地满足系统无功需求,证实了所提出控制策略的正确性,提高了系统的低电压穿越能力。
Aiming at the problems of the DC over-voltage and the dynamic reactive power compensation, which caused by the doubly-fed wind generator switch Crowbar circuit when the grid voltage dips, and basing on the feedback linearization theory, the nonlinear control strategy on grid-side converter is proposed. This paper adopts a coordinated control STATCOM to compensate the dynamic reactive power of the grid. Simulation result shows that, the grid-side nonlinear controller can well restrain the DC over-voltage during the grid voltage dip, and meet the requirements of system reactive power by introducing a STATCOM compensation device. The result also confirms the correctness of the control strategy, which improves the ability of low voltage ride through （LVRT） of the system. This work is supported by National Natural Science Foundation of China （No. 51267001）.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2014年第14期67-71,共5页
Power System Protection and Control
基金
国家自然科学基金资助项目(51267001)
广西科学基金资助项目(桂科自0728027)
南宁市市校科技合作专项项目(200801029D)
北海市市校科技合作专项项目(北科合200801027)~~
关键词
双馈风力发电机
低电压穿越
电压跌落
网侧变换器
静止无功补偿
doubly-fed induction generator （DFIG）
low voltage ride through （LVRT）
voltage dip
grid-side converter
STATCOM
