±800kV哈郑特高压直流控制方式对河南电网电压稳定性影响研究

Impacts of DC system control mode for ±800 kV Ha-Zheng UHVDC on voltage stability of Henan Power Grid

为了优化哈郑特高压直流投运后河南电网的运行方式,详细分析了直流系统控制方式与受端电网电压稳定性的关系,揭示了不同的控制方式影响换流站交流母线电压稳定性的规律,并结合河南电网2014年的规划数据进行仿真和验证。仿真结果表明:哈郑直流系统采取CP-CV(整流侧定功率,逆变侧定电压)的控制方式有利于受端电网的电压稳定;同时哈郑直流投运后,河南电网采取往湖北等华中地区多通道外送直流功率,以及采用内部消耗+过境模式相结合的运行方式等,更有利于提高其静态电压稳定水平。该研究成果为河南电网的优化运行与调度提供了理论依据。

In order to optimize the operation pattems of Henan power grid after putting the _＋ 800 kV UHVDC from Hami to Zhengzhou into operation, the relationship between DC system control modes and voltage stability of receiving-end power network is analyzed in detail, and the regularity of different control modes impacting the voltage stability of AC bus at converter station is revealed and simulated based on the planning data of Henan power grid in 2014. Simulation results show that the Ha-Zheng UHVDC taking CP-CV control mode i.e. constant power at rectifier side and constant voltage at inverter side will be conducive to voltage stability of receiving-end power network; after putting Ha-Zheng UHVDC into operation, the operation pattems of multi-channel transferring HVDC power from Henan to Central China Grid combined with partly internal consumption are favorable to improve the static voltage stability. The analysis results provide theoretical basis for future optimizing operation and scheduling of Henan power grid.