撬棒电路对风电场侧联络线距离保护的影响及对策  

Impact of Crowbar on Wind Farm Side Interconnection Line Distance Protection and Mitigation Method

作　　者：黄涛[1] 陆于平[1] 凌启程[1] 王业[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096

出　　处：《电力系统自动化》2013年第17期30-36,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50977012)~~

摘　　要：针对集中送电的双馈风力发电系统,将低电压穿越措施与风电场的弱馈特性相结合,对风电场的故障特征进行分析。指出撬棒电路的投入会增大风电场的正负序阻抗,尤其是正序阻抗,从而使风电场的弱馈程度增强。进而分析了撬棒电路对风电场联络线距离保护的影响,指出撬棒电路的投入和风电场的弱馈特性可能导致故障选相装置误选相及某些阻抗继电器的计算精度降低,并提出了相应的改进措施。最后,建立了双馈风电场并网仿真模型,仿真结果验证了理论分析的正确性。Considering the low voltage ride through （LVRT） requirement and weak-infeed feature of wind farms, the fault characteristics of a centralized wind farm is analyzed firstly based on doubly-fed wind power generation system. Since the Crowbar protection contributes to the positive and negative sequence impedances, especially the former, the wind farm weak- infeed characteristics are strengthened. On that basis, the performance of distance protection of wind farm grid connection line is analysed. The results show that the Crowbar and weak-infeed property of wind farm may cause wrong phase selection and affect the precision of impedance protection relay. Some countermeasures are also proposed. Finally, a doubly-fed wind farm is simulated, and the simulation results demonstrate the validity of the theoretical analysis.

关 键 词：风力发电系统 低电压穿越 距离保护 弱馈 撬棒 

分 类 号：TM614[电气工程—电力系统及自动化] TM773