具有低电压穿越能力的风电接入电力系统继电保护的配合  

Cooperation of relay protection for grid-connected wind power with low-voltage ride-through capability

作　　者：张保会[1] 王进[1] 李光辉[1] 郝治国[1] 刘志远[2] 薄志谦[3] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]宁夏电力公司调度中心,宁夏银川750001 [3]ALSTOM输配电有限公司

出　　处：《电力自动化设备》2012年第3期1-6,共6页Electric Power Automation Equipment

基　　金：国家973计划资助项目(2009CB219704)~~

摘　　要：具备低电压穿越能力的风电机组要求在一定的故障条件下不脱网,需要相关继电保护与之配合。详细分析了风电场送出线以外输电系统元件故障、风电场送出线故障、风电场内部电网故障以及风电机组本体故障情况下,输电系统保护以及风电场内部保护应有的配合关系。进一步分析了当前集中式接入风电场的继电保护配置,指出风电机组保护及变流器保护选择性不强,在风电场内部保护或系统保护动作切除故障之前,风电机组已经脱网,而且将风电网等同于单侧电源的配电网,没有考虑风电机组对短路的贡献。最后分析了单风电机组本体保护、风电场主变保护、风电场送出线保护需要进行的改进,以保证低电压穿越能力的发挥,并指出各保护需要注意的问题。The wind turbine with low-voltage ride-through capability is required not to disconnect from grid under certain fault conditions,for which the relevant relay protections should cooperate with it. The cooperation between the relay protection of transmission system beyond the wind farm outgoing line and the relay protection of wind farm is analyzed for different faults of transmission system components,wind farm outgoing line ,wind farm internal grid and wind turbine. The current configuration of relay protection for the wind farm centrally connected to power grid is analyzed and it is pointed out that,the selectivity of wind turbine protection and converter protection is not enough,which leads to the disconnection of wind farm from grid before the fault is removed by wind farm internal relay protection or system relay protection,and the current configuration regards the wind power as a distribution network with single source,which neglects the contribution of wind turbine to short-circuit fault. Improvements are proposed for the relay protections of wind turbine ,main transformer and outgoing line to ensure the successful low-voltage ride-through,and their problems are pointed out.

关 键 词：风电 低电压穿越 电力系统 继电保护 配合 

分 类 号：TM77[电气工程—电力系统及自动化] TM614