线路距离Ⅲ段保护动作裕度的节点功率控制算法  

Power Injection Control to Operation Margin of Zone 3 Impedance Relay on Transmission Lines

作　　者：李生虎[1] 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009

出　　处：《电力系统自动化》2006年第16期27-31,80,共6页Automation of Electric Power Systems

摘　　要：通过线路潮流对线路阻抗的相量分解,建立电压函数形式的距离Ⅲ段动作裕度函数；借助潮流雅可比矩阵,建立该裕度函数对节点注入功率的灵敏度指标,从而得到避免距离Ⅲ段不合理动作的直接控制方案。算例结果表明：保护动作裕度得到有效控制；同一节点有功和无功功率控制可能具有相反的控制效果；所提出的控制算法对重载系统效果更加明显；控制误差极小；由于避免了众多潮流检验方案,计算效率大大提高。New expression of operation margin for mho relays is established by decomposing the line flow to the line impedance vector. Preventive control model based on the sensitivities of operation margin to power injection is proposed with the help of load flow Jacobian matrix. Based on the simulation results on IEEE 14-bus test system, it is found that： （1） the operation margin can be effectively controlled via sensitivity method; （2） the active and reactive power control at the same bus will yield different or even opposite control effects; （3） the proposed method is especially effective for stressed power system; （4） the relative control error compared with that of load flow method is very small; （5） the calculation efficiency is much higher than that of load flow method.

关 键 词：距离Ⅲ段保护 节点功率控制 保护动作裕度 灵敏度 后备保护 

分 类 号：TM773[电气工程—电力系统及自动化]