哈郑直流工程投运初期对新疆电网影响分析

±800 kV哈密至郑州直流输电工程（简称哈郑直流）是新疆规划建设的第1个直流工程,预计2013年投运。针对2013年哈郑直流投运初期对电网稳定性影响分析,校核哈郑直流故障对新疆与西北750 kV交流联络通道的影响。其中以新疆电网2013年冬季大负荷方式为基础,通过详细的潮流及暂态稳定仿真计算分析发生直流单、双极闭锁故障,750 kV交流线路故障时电网的稳定特性以及采取切机措施下电网稳定特性的变化情况。通过仿真计算找出在不采取切机措施时发生直流单极闭锁的交流断面最大传输功率,同时对直流单极闭锁时采取切机措施来提高交流系统送电能力的有效性进行了验证。该分析结论为未来哈郑直流工程的建设及安全控制策略的制定可提供参考。

Analysis on the Impact of Hami-Zhengzhou Ultra-High Voltage DC Project on the Power Grid

The Hami-Zhengzhou ±800 kV UHV DC project is the first DC project under construction in Xinjiang autonomous region and is planned to be put into operation in 2013. The influence of the project on the power grid stability in its commencement period is discussed and the impact of the project′s possible fault on the 750 kV AC connection project between Xinjiang and Northwestern power grid is checked. Based on the maximum power load of the Xinjiang power grid in the Winter period, a power flow and transient stability simulation analysis is conducted on the stability features of the power grid under the condition of monopole or bipolar lockout of the DC transmission lines and at the fault of the 750 kV AC transmission lines, and on the power grid stability variation with switch off measures of generators. Through simulation, the maximum transmission power of the AC section is determined under the condition of monopole lockout of DC system with different switch off measures of generators, and the effectiveness of generator switch off measures to increase the transmission capacity of AC power system is also verified. The conclusions obtained from this paper may provide a reference to the construction and security control strategy formulation of the Hami-Zhengzhou DC project.