大型电力系统失步解列装置的协调方案

电力系统稳定破坏的事故国内外时有发生，电网失步时解列失步断面或快速切除送端电厂的部分发电机组是最基本的控制措施。文中介绍了目前国内高压电网解列装置使用的3种失步判据，介绍了不同装置之间的配合方法，指出这些配合方法适用于结构比较简单的系统，而对于复杂的互联电力系统，往往难以达到快速、准确解列的要求。分析了南方电网4个失步断面的具体情况，指出对于比较复杂的某些断面有关解列装置应借助远方通信进行协调配合，以实现快速、有选择的解列控制。另外，对于利用同步相量测量装置(PMU)实现电力系统的解列控制的条件提出了看法，以期今后在这一方面能得到实际应用。

COORDINATION OF OUT-OF-STEP PROTECTION EQUIPMENT IN LARGE POWER SYSTEMS

Disconnecting the grid or quickly tripping the generators is considered the main solution to prevent a power system from collapse, when the synchronization loss takes place. This paper outlines three criteria for detecting the synchronization loss, which have been widely used in domestic out of step protection equipment in China. The coordination methods among different equipment are reviewed in the paper, which concludes that they only fit with simple systems and may be difficult when applied to complicated systems. The synchronization loss of South Power System in China is analyzed, and the result indicates that for some complicated situations, the protection equipment should make use of remote communication to coordinate, so as to obtain quick and selectable disconnecting action. Some discussion about making use of PMU system to fulfill power system disconnection is also given.