多直流馈入华东受端电网暂态电压稳定性分析  

Transient Voltage Stability Analysis of East China Receiving-End Power Grid With Multi-Infeed HVDC Transmission Lines

作　　者：邵瑶[1] 汤涌[1] 郭小江[1] 周勤勇[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2011年第12期50-55,共6页Power System Technology

基　　金：国家电网公司科技项目(XT71-10-024)~~

摘　　要：基于2015年"三华"特高压规划电网的丰大运行方式,利用短路比和多馈入短路比指标分析了华东受端电网的强度,并讨论了受端系统网架调整和直流系统落点位置对短路比/多馈入短路比的影响。采用PSD-BPA暂态稳定程序,分析了华东受端电网在各种故障下的暂态电压稳定性。结果表明:直流系统落点位置对华东受端电网强度的影响较大;交直流系统单一故障、受端特高压交流通道和逆变站换流母线附近线路发生三相永久性短路跳双回故障,大部分直流系统双极闭锁均不会导致华东受端电网暂态电压失稳;锦屏—同里、锡盟—金坛、复龙—奉贤和溪洛渡—浙西特高压直流发生双极闭锁故障后,送端电网需采取切机措施才能保持系统稳定。Based on the summer peak load operation mode of the planned ＂North China-Central China-East China＂ UHV power grid in 2015, there will be 10 HVDC transmission lines feeding into East China power grid. The strength of East China receiving-end power grid is analyzed by short circuit ratio （SCR） and multi-infeed short circuit ratio （MISCR）, and the impacts of network topology adjustment in receiving-end power grid and the positions where the multi-infeed DC transmission lines are connected with East China receiving-end power grid on SCR/MISCR are dissected. By use of PSD-BPA transient stability program, transient voltage stability of East China receiving-end power grid under various faults is analyzed. Analysis results show that the positions, where the multi-infeed DC transmission lines are connected with East China receiving-end power grid, greatly impacts the strength of the latter; all unipolar block faults occurred in DC systems, single faults occurred in AC/DC system, three-phase permanent short-circuit fault, which causes the tripout of two circuits, occurred in UHVAC transmission line of receiving-end system and that occurred in the line near commutation buses of inverter station and majority of DC bipolar block faults occurred in DC systems will not lead to transient voltage instability of East China receiving-end power grid; when DC bipolar block faults occurred in UHVDC transmission lines, which are from Jinping to Tongli, Grenoble union of cylinder to Jintan, Fulong to Fengxian and Xiluodu to Zhexi respectively, it is necessary for East China receiving-end power grid to take generator tripping measures or its system stability cannot be maintained.

关 键 词：多直流馈入 受端电网 短路比 多馈入短路比 暂态电压 

分 类 号：TM744[电气工程—电力系统及自动化]