DVR在风电机组LVRT中的应用及其无功补偿能力  

Application of DVRs to enhance the LVRT capability of WTGs and analysis of the reactive power compensation ability

作　　者：黄伟煌[1,2,3] 胡书举[1,3] 付勋波[4] 许洪华[1,3,4] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学,北京100080 [3]中国科学院风能利用重点实验室,北京100190 [4]北京科诺伟业科技有限公司,北京100083

出　　处：《电机与控制学报》2014年第3期7-13,共7页Electric Machines and Control

基　　金：国家科技支撑计划资助项目(2012BAA01B00)

摘　　要：针对动态电压补偿器(DVR)在风电机组低电压穿越(LVRT)的应用进行了讨论。为了提高DVR的动态响应能力,设计了双闭环控制策略,并引入电网电压前馈项,以避免补偿电压的过冲;电压外环采用了谐振控制器,可在静止坐标系下实现无静差跟踪,省略了坐标变换以及锁相环节。同时详细分析了DVR在正常运行与跌落情况下无功补偿能力,通过对其补偿方式的分类与比较,指出了其无功补偿能力受到限制的原因。在Matlab/SIMULINK中构建仿真模型,仿真结果表明,所设计的控制策略能够迅速精准地补偿定子电压,减小了定子电流冲击,平稳地实现了机组的低电压穿越。最后在110 kW的电机平台上进行了实验验证。This paper discusses the application of dynamic voltage restorers （DVRs） for low voltage ride through （LVRT） of wind turbine generators. In order to enhance the dynamic performance of DVRs, a muhiloop plus feedforward control strategy based on resonant regulator is proposed. The grid voltage feed- ward can limit the overshot of the compensation voltage. The resonant regulator was applied in the voltage loop, in order to achieve zero steady error, and omit the coordinate transformation and the phase-locked loop. In the meanwhile, the discussion for and faulty condition was also carried out reactive power compensation capability of DVR under normal By categorizing and comparing different compensation strate- gies, the limitation of reactive power compensation capability for DVR was pointed out. The simulation results in Matlab/SIMULINK shows that the proposed strategy stabilizes the stator vohage quickly and effectively, limits the stator current overshoot, and realizes the LVRT smoothly. Finally, experiment was carried out on a 110 kW motor platform.

关 键 词：风电机组 动态电压补偿器 低电压穿越 谐振控制器 无功补偿 

分 类 号：TM614[电气工程—电力系统及自动化]