双馈风电机组低压穿越特性对电力系统暂态稳定的影响  

Impact of DFIG LVRT characteristics on transient stability of power system

作　　者：冯雷[1] 蔡泽祥[1] 王奕[2] 刘平[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东电网公司电力科学研究院,广东广州510080

出　　处：《电力自动化设备》2018年第3期16-23,共8页Electric Power Automation Equipment

基　　金：广东省自然科学基金资助项目(2017A030313288)~~

摘　　要：双馈风电机组(DFIG)的低压穿越(LVRT)特性与同步发电机不同,使得大规模DFIG接入电力系统后同步发电机的功角特性发生改变,因此分析系统暂态稳定性时有必要考虑DFIG LVRT行为的特殊性。推导机电暂态时间尺度下DFIG撬棒未投入和投入2种工况下的等值模型,基于该模型对典型LVRT策略下DFIG的外特性进行分析;基于等面积定则研究DFIG LVRT策略中无功补偿系数与撬棒电阻对电力系统暂态稳定的影响。时域仿真结果表明,提高无功补偿系数和增加撬棒电阻有利于电力系统的暂态稳定性,验证了理论分析的正确性。The LVRT（ Low-Voltage Ride-Through） characteristics of DFIG（ Doubly-Fed Induction Generator） is dif- ferent from that of synchronous generator, which makes the rotor angle characteristics of synchronous generator change after large scale DFIGs integrated into the power system, so it is necessary to consider the particularity of DFIG LVRT behavior when analyzing transient stability of power system. The equivalent models of DFIG with and without Crowbar on an eleetromechanieal time scale are deduced, on this basis, the extemal characteristics of DFIG under typical LVRT strategy is analyzed. The impact of reactive power compensation coefficient and Crowbar resis- tance in DFIG LVRT strategy on transient stability of power system is researched based on equal area criterion. The time-domain simulative results show that the increase of reactive power compensation coefficient and Crowbar resis- tance is helpful for the transient stability of power system, verifying the correctness of the theoretical analysis.

关 键 词：电力系统 双馈风电机组 低压穿越 撬棒电阻 暂态稳定 等面积定则 

分 类 号：TM614[电气工程—电力系统及自动化] TM712