计及发电机动态的多端口网络等值及中长期电压稳定监视  

Multi-port Network Equivalent Considering Generator Dynamics and Mid-long Term Voltage Stability Monitoring

作　　者：王晶[1] 李卫星[1] 李志民[1] 孙勇[2] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江省哈尔滨市150001 [2]国网吉林省电力有限公司,吉林省长春市130021

出　　处：《中国电机工程学报》2015年第18期4607-4615,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51377034);国家重点基础研究发展计划项目(973项目)(2013CB228203-3)~~

摘　　要：在中长期电压稳定过程中,发电机可能会由于无功短缺导致过励磁限制器(over-excitation limiter,OXL)启动,使得将发电机保持为PV节点的这一传统做法面临一定问题。该文对常规多端口网络等值方法进行了改进,将可描述OXL作用下的发电机模型应用到多端口网络中,给出了发电机OXL启动的在线判定方法,使得改进后的多端口等值网络能够有效计及发电机OXL的动态变化。进一步,基于计及发电机动态的多端口等值网络,推导出可辨识负荷功率最大值点的电压稳定性指标。仿真结果表明,该文方法对即将发生的中长期电压崩溃能起到有效的预警作用。During the mid-long term voltage stability, the generator may, due to reactive power shortages, start its over-excitation limiter （OXL）, leading the conventional approach that keeps the generator asPV node faces some problems. This paper improved the traditional multi-port network equivalent method by applying the generator model which can describe the action of OXL to the multi-port network, and provided an approach for online identification of OXL startup, thus the dynamic conversion of generator OXL can be considered in the improved multi-port equivalent network. Further, a voltage stability index was, based on the proposed multi-port equivalent network, derived to identify the maximum load power point. Simulation results show that the proposed method can provide a good early warning for the impending mid-long term voltage collapse.

关 键 词：多端口网络等值 发电机动态 中长期电压稳定 在线监视 

分 类 号：TM712[电气工程—电力系统及自动化]