同步和异步联网系统直流受端电网电压支撑能力评估  

Evaluation Voltage Supporting Strength of Receiving-End Power Grid of HVDC Transmission System in Environment of AC/DC Parallel Power System and Asynchronously Interconnected Power Grid

作　　者：张一荻[1] 苏悦平[1] 管霖[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640

出　　处：《电网技术》2012年第1期90-95,共6页Power System Technology

基　　金："十一五"国家科技支撑计划重大项目(2006BAA02A17)~~

摘　　要：在异步互联电网和交直流并联电网中研究了短路比系列指标与直流故障引起的受端交流电网稳态电压跌落之间的定量关系。结果表明在异步联网系统中,直流短路比指标能有效地定量指示出直流故障下交流电网的电压支撑能力,而在交直流并联电网中则不能。针对交直流并联电网,提出了改进短路比指标的思路和新指标。仿真结果表明,改进短路比指标能够有效地定量指示出交直流并联电网中直流闭锁引起的交流母线稳态电压跌落水平。In the environment of AC/DC parallel power grid and asynchronously interconnected power grid the quantitative relation between steady state voltage dips caused by faults occurred in HVDC transmission system and series indices of short-circuit ratio （SCR） is researched. The obtained results show that in asynchronously interconnected system, HVDC SCR indices can effectively and quantitatively indicates the voltage supporting strength of AC power grid under faults occurred in HVDC system; however such HVDC SCR indices cannot play a similar part in AC/DC parallel power grid. Thus for AC/DC parallel power grid, a thinking and corresponding improved new SCR indices are proposed. Simulation results show that the improved SCR indices can quantitatively indicate the steady state voltage dip of AC busbar caused by DC block faults occurred in AC/DC parallel power grid.

关 键 词：交直流并联电网 多馈入直流受端系统 直流短路比 电压支撑强度 

分 类 号：TM72[电气工程—电力系统及自动化]