基于补偿电压故障分量的纵联方向保护原理与仿真研究

根据负序、零序、正序突变量及相间突变量等在故障分量叠加网络中的分布情况,该文提出了基于上述各种故障分量的一系列方向保护判据.这些判据利用故障后母线电压故障分量与补偿电压故障分量幅值的相互关系来判别故障点的方向.根据各判据的特点,从实用化角度考虑,提出了基于补偿电压故障分量的综合纵联方向保护原理.并按照故障发展的不同时段分别投入不同的保护判据,综合构成了完善的纵联方向保护方案.文中还进一步分析了该系列判据的动作特性以及灵敏度问题.仿真结果表明,由该系列方向保护判据构成的纵联方向保护具有原理简单可靠、动作速度快、灵敏度高、容易实现等优点,能适应于系统中各种复杂故障工况,如：故障发展、复故障、弱馈、高阻接地、非全相以及系统振荡等.

PRINCIPLE INVESTIGATION AND SIMULATION OF DIRECTIONAL PROTECTION BASED ON FAULT COMPONENT OF COMPENSATING VOLTAGE

According to distribution of negative sequence, zero sequence, positive sequence fault component and phase-to-phase fault component in superimposed network, the series directional discriminating methods are presented. For practicable purpose, the integrated protection scheme using above series methods is proposed. In addition, the operating characteristics and sensitivity of these methods are analyzed. The result of transient simulation demonstrated that this scheme can be widely applied under the different fault conditions such as fault diversion, multi-fault, weak-feed operation, high impedance fault, two phase operation and power system oscillation. And the integrated scheme is simple, rapid, reliable and easy to realize.