基于电压灵敏度的受端系统电压支撑强度评价指标

A Voltage Support Strength Index Based on Sensitivity for Receiving End of HVDC System

针对直流受端系统结构复杂、运行方式灵活多变的现状，对直流系统功率稳定进行分析，提出了受端系统电压支撑强度因子（receiving．end．system voltage support strength factor，RVSF），并给出了使用RVSF对受端系统电压支撑强度进行划分的标准。定义临界功率稳定时的RVSF为临界受端电压支撑强度因子，该因子值可以在不同受端系统中保持恒定，能够满足受端系统运行方式多样的现状。分析了RVSF与电压稳定因子的关系，得到了使用RVSF对换流母线静态电压稳定进行判别的方法。最后通过算例对使用RVSF评价受端系统电压支撑强度的有效性进行了验证。

Operation mode of HVDC terminal system is flexible and changeable. In this paper, power stability of HVDC system is analyzed, and a receiving-end-system voltage support strength factor（RVSF） is proposed. The criteria for dividing voltage support strength of receiving-end system using RVSF are given. Its critical value, calculated with critical power stability analysis, is defined as critical receiving-end-system voltage support strength factor（CRVSF）. CRVSF is able to be kept constant in different receiving end systems, and meet the situation of diversity of power system operation mode. Relationship between RVSF and voltage stability factor is analyzed using RVSF to determine static voltage stability of converter bus. Finally, effectiveness of discriminating voltage support strength of the receiving-end system using RVSF is verified.