永富直流受端电网电压稳定性研究

Research on Voltage Stability of Receiving-End Grid in Yongfu HVDC Project

摘要:

永富直流是国内首个省内直流输电项目，其受端富宁换流站接入的交流系统较弱，换流站内装设有固定串补 和 STATCOM，对系统安全稳定分析带来了挑战。基于静态稳定和时域仿真分析方法，分析了富宁换流站所在地区电 网在 N － 1 和严重故障下的静态电压稳定和暂态稳定，研究了富宁换流站 STATCOM 接入后对系统电压稳定性的影 响，为大容量直流接入弱交流系统的稳定分析提供了新思路。

关键词:永富直流; 电压稳定性; 静态电压稳定; 区域有功功率裕度; 暂态稳定; STATCOM

Abstract:

Yongfu HVDC ( YFDC) project is the first provincial HVDC project in China． As the receiving end of Yongfu HVDC，Funing inverter station is connected to weak AC system，and installed with fixed serial capacity ( FSC) and STATCOM，which has brought challenge to the security analysis of power grid． Firstly continuation power flow method is used to analyze the voltage stability of the AC/DC power transmission system around YFDC． Then，time － domian simulation analysis is carried out to study the transient stability under N － 1 /N － 2 contingencies． Finaly，the effects of STATCOM on the voltage stability of the AC/DC hybrid system is analyzed，which provides a new idea for the security analysis of the large － capacity HVDC connected to the weak AC system．

Key words:Yongfu HVDC project; voltage stability; static voltage stability; regional load active power margin; transient stability; STATCOM