适用于弱电网的双馈风电机组新型故障穿越控制方法  

Control Method for Fault Ride-through of DFIG-based Wind Turbines Applied to Weak Grids

作　　者：洪敏[1] 章雷其[1] 迟方德 张琳 李晓婷 辛焕海[1] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]陕西电力调度控制中心,陕西省西安市710048 [3]国网陕西省电力公司电力经济研究院,陕西省西安市710065

出　　处：《电力系统自动化》2017年第10期44-50,共7页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2016YFB0900104)~~

摘　　要：弱电网下系统的电压稳定裕度较低,而风电场的故障穿越性能对系统的暂态电压稳定性有显著影响。传统的双馈风电机组故障穿越控制方法都是基于适用于强电网的定功率控制,不利于维持弱电网下的电压稳定性。提出一种适用于弱电网中双馈风电机组的新型故障穿越控制方法。这种新型控制方法基于同步控制,通过有功电流和无功电流下垂控制风电机组出口电压的角度和幅值,使双馈风电机组以可控电压源的外特性运行。该控制方法能使双馈风电机组在弱电网的对称故障和不对称故障中均提供无功和有功电流,并且能在故障清除后的重励磁暂态过程中提高系统的电压稳定性。该方法同样适用于需要在联网和孤网运行之间进行无缝切换的双馈风电机组。最后,通过双馈风电机组接入无穷大电网实际电网、孤网的仿真算例验证了该故障穿越控制方法的有效性及优越性。The voltage stability margin of the weak grid is usually insufficient. While the fault ride through （FRT） performance of the wind farm has significant effect on the transient voltage stability of power grid. The traditional FRT control method for doubly fed induction generator （DFIG） based wind turbine is on the basis of constant power control which is suitable for strong grid. gut it is diffieuh to support transient voltage stability of the weak grid. Therefore, a new FRT control method for DFIG based wind turbine is proposed which can be applied to weak grids. The proposed control method based on synchronized control makes the wind turbine operate as controllable voltage source via active current and reactive current droop control. It not only enables the DFIG based wind turbine to provide active and reactive currents, but also enhances the voltage stability during the transient re exciting process after grid fault clearance, h is applicable for the DFIG based wind turbine which needs seamless switching between grid connected and isolated networks as well. The effectiveness and advantages of the proposed control method is validated by the simulation cases of DFIC-based wind turbine connected to infinite bus, practical regional and islanded micro grid.

关 键 词：弱电网 双馈风电机组 故障穿越 定功率控制 同步控制 电压稳定 

分 类 号：TM614[电气工程—电力系统及自动化]