基于相位角原理的特高压电网失步解列改进方案  

An Improved Strategy for Out-of-step Separation Based on Phase Angle Principle for 1000 kV Ultra-high Voltage AC Power Grids

作　　者：任建锋[1] 丁亚伟 付磊[1] 陈汹[1] 李雪明[1] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003 [2]洛阳市供电公司,河南省洛阳市471000

出　　处：《电力系统自动化》2011年第10期104-107,共4页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(SGKJ[2007]994/1)~~

摘　　要：传统的基于相位角原理的失步解列判据是通过判断装置安装处电流和电压的相位角变化轨迹来区分短路故障和失步振荡的。由于1 000kV交流特高压线路一次时间常数较大,因此在某些三相短路故障情况下易造成基于相位角原理的失步解列装置误动。针对上述现象,在深入分析发生短路故障和失步振荡情况时特高压输电线路电流和电压特性的基础上,提出了一种失步解列改进方案。最后,根据国家电网公司企业标准中推荐的1 000kV长距离、短距离线路典型接线方案建立了实时数字仿真(RTDS)模型,并利用该模型对改进方案的有效性进行了实验验证。Traditional out-of-step separation criterion based on the phase angle principle is used to distinguish short-circuit fault from the out-of-step oscillation,through tracing the changing trajectory of phase angle between current and voltage which are measured at the installation location of the equipment.Due to the large time constant of 1 000 kV ultra-high voltage（UHV） AC lines,the out-of-step separation equipment based on the phase angle principle may mal-operate in some cases of three-phase short-circuit faults.In view of the above phenomenon,an improved out-of-step separation strategy obtained by the in-depth analysis of the current and voltage characteristics between short-circuit fault and out-of-step oscillation in UHV transmission lines,is proposed.Finally,a real-time digital simulation（RTDS） model based on typical wiring scheme for 1 000 kV long and short distance lines recommended in State Grid Corporation enterprise standard,is set up,and the effectiveness of the improved solution is verified by the test with RTDS model.

关 键 词：失步解列 特高压电网 相位角 稳定控制 

分 类 号：TM727[电气工程—电力系统及自动化]