交直流混联系统突变量方向元件适用性研究  

Research on applicability of directional element based on the power-frequency variation in AC-DC hybrid system

作　　者：裘愉涛[1] 陈水耀[1] 杨恢宏 雷振锋 何方明[3] 宋国兵[3] 索南加乐[3] 

机构地区：[1]浙江电力调度通信中心,浙江杭州310007 [2]许继电气股份公司,河南许昌461000 [3]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力系统保护与控制》2012年第13期115-120,共6页Power System Protection and Control

摘　　要：交直流混联电网在我国应用越来越广泛,传统继电保护方向元件出现过多次误动现象。针对各种突变量方向元件进行全面分析及仿真验证,并提出一种基于0模的快速方向元件判别方法。交直流混联电网中,由于逆变侧等值交流系统正、负序阻抗不相等且其阻抗角与线路阻抗角相差较大,基于正、负序原理的突变量方向元件将会出现误判,性能无法保证;而对于零序原理的方向元件,由于逆变侧零序网络较为稳定,其性能可靠,能够正确动作。基于0模的快速方向元件判别方法与传统基于傅氏算法的零序方向元件相比,动作速度快,性能更稳定。PSCAD仿真数据验证了分析的正确性。AC-DC hybrid power grid has been applied more and more widely in China. The traditional relay protection direction components mis-operate for several times. This paper analyzes and simulates different delta variable direction components, and proposes an identification method for high-speed directional relay based on zero mode data. In AC-DC hybrid power grid, as the equivalent positive sequence impedance and negative sequence impedance of the inverter side are not equal, and the system impedance angle is different from the transmission line impedance angle, a directional relay based on the principle of positive and negative sequence delta variables is apt to mis-operate, and its performance is not satisfactory. On the contrary, as the inverter side zero-sequence network is stable, zero sequence directional relay can operate correctly and reliably. Based on the analysis, a high-speed directional relay based on zero mode data is proposed, which is faster than a traditional directional relay based on Fourier algorithm. The analysis is verified by PSCAD simulation results.

关 键 词：交直流混联 正 负序阻抗 突变量方向元件 零序方向元件 快速方向元件 

分 类 号：TM77[电气工程—电力系统及自动化]