改善电力系统局部电压稳定指标精度的策略  

A Strategy to Improve Accuracy of Power System Local Voltage Stability Index

作　　者：陈厚合[1] 李筱婧[1] 运奕竹[1] 

机构地区：[1]东北电力大学电气工程学院,吉林省吉林市132012

出　　处：《电网技术》2014年第3期723-730,共8页Power System Technology

基　　金：国家自然科学基金资助项目(51377016);长江学者和创新团队发展计划资助(IRT1114)~~

摘　　要：首先建立适用于实际电力系统的局部电压稳定指标的模型;针对网络中存在发电机和负荷共线的混合节点,计及混合节点中负荷和发电机对指标值的共同作用,提出将混合节点分裂为发电机内电势节点和电压可控负荷节点、发电机经升压变接入混合节点和发电机经升压变、负荷经降压变接入混合节点3种改善局部电压稳定指标精度的方案,重点研究了将负荷与发电机共线的混合节点分裂为发电机内电势节点和电压可控负荷节点的方案;在此基础上,设计电压稳定在线监测的处理流程。所提方法物理概念清晰、计算速度快、精度高,考虑了混合节点中负荷和发电机对于局部电压稳定指标值的影响,提高了电压稳定在线监测的精度,算例仿真结果验证了所提方法的可行性和有效性。Firstly, a local voltage stability index model is established which is suitable for actual power system. Aiming at the mixed node in power network where the generator and the load coexist, the combination of the generator and the load in the mixed node involving index value is taken into account, and three schemes that are in order to improve the accuracy of the local voltage stability index are proposed. Three schemes are as following：the mixed node is split into generator internal potential node and load node where the voltage is controllable;the generator is connected to the mixed node via the step-up transformer;and the generator is connected to the mixed node via the step-up transformer and the load is comented to the mixed node via step-down transformer. Key research is the former one. On this basis, the processing flow for on-line monitoring of the voltage stability is designed. The proposed method are applied clear physical concept, the high computing speed and the high accuracy, also considering the impact of the generator and the load in the mixed node on the value of the local voltage stability index. In this way the accuracy of the on-line monitoring of voltage stability can be improved. The feasibility and effectiveness of the proposed method is validated by simulation results as well.

关 键 词：电压稳定 在线监测 局部电压稳定指标 局部量 测信息 

分 类 号：TM714[电气工程—电力系统及自动化]