地区电网高频切机优化及与超速保护的配合

Configuration Scheme of Over-Frequency Tripping and Coordination with Over-Speed Protection Controller(OPC) of Regional Grid

分析地区电网与主网解列后孤网运行时的频率特性,指出影响孤网频率的主要因素为功率不平衡量和系统惯量。针对新疆石河子电网可能出现的高频问题,通过高频切机配置方案研究及高频切机与火电机组超速保护控制器(OPC)的协调配合研究,提出适应于地区电网的高频切机方案,以及应优先采用高频切机来抑制频率升高,尽量避免OPC反复动作的配置原则。

By analyzing frequency characteristics of a regional grid under the isolated operation condition,the main factors influencing the islanding frequency are identified to be the unbalance of the power and the inertia of the grid.In order to solve the possible problem of over-frequency during the isolated operation of a real grid,the paper analyzes the configuration solution of over-frequency tripping and its coordination with an over-speed protection controller （OPC）,and proposes the configuration scheme of over-frequency generator-tripping which is of good adaptability for other regional grids and the configuration principles which require to curb the frequency increase preferentially and avoid the repeating actions of the OPC.