风电系统中无功功率补偿装置控制研究

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英文篇名：Control Research of Reactive PowerCompensation Device in Wind Power System 作者：倪超 ; 王菲 ; 曹磊 ; 徐海洋 英文作者：Ni Chao;Wang Fei;Cao Lei;Xu Haiyang;College of Electrical Engineering,Southeast University; 关键词：STATCOM ; 前馈解耦控制 ; LCL滤波器 ; 电压稳定性 英文关键词：STATCOM;;feed-forward decoupling control;;LCL filter;;voltage stability 中文刊名：XDGY 英文刊名：Modern Industrial Economy and Informationization 机构：东南大学电气工程学院; 出版日期：2019-04-02 16:45 出版单位：现代工业经济和信息化 年：2019 期：v.9;No.176 语种：中文; 页：XDGY201902011 页数：3 CN：02 ISSN：14-1362/N 分类号：33-35

摘要

针对低压STATCOM容量较小的不足,提出采用多机并联并采用空间电压矢量调制技术、LCL滤波器并网的整体方案。采用LCL滤波器并网,有效地减小了电抗值,降低了成本且提高了装置的功率密度。本文根据STATCOM在dq坐标下的数学模型,采用电网电压前馈、有功和无功电流解耦的控制策略,可以很好地实现STATCOM有功和无功独立控制。控制器采用传统的PI调节器,能做到动态跟随性能和静态误差都满足要求。仿真分析表明,在系统突加突卸负载、电网发生三相短路故障等工况下,STATCOM能起到稳定并网点电压的作用。在风电场的仿真中,STATCOM能快速动态地补偿风电场所需无功,提高了风电场运行的功率因数。
        In view of the small capacity of low-voltage STATCOM, an integrated scheme is proposed, which uses multi-machine parallel connection, space voltage vector modulation technology and LCL filter to connect to the grid. The LCL filter connected to the grid effectively reduces the reactance value, reduces the cost and improves the power density of the device. According to the mathematical model of STATCOM in DQ coordinate, the control strategy of voltage feed-forward, active and reactive current decoupling of power grid can be used to realize the independent control of active and reactive power of STATCOM. The traditional PI regulator is used in the controller, which can satisfy the requirement of dynamic follow-up performance and static error. The simulation results show that STATCOM can stabilize the grid-connected voltage under the conditions of sudden load unloading and three-phase short-circuit fault. In wind farm simulation, STATCOM can quickly and dynamically compensate the reactive power required by wind farm and improve the power factor of wind farm operation.

引文

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