A recommended scheme of the QZ pumped-storage power station connecting to power system was introduced. The reasonable operating mode was chosen for the QZ pumped-storage power station based on the real condition of the power grid. Power flow and stability calculation was conducted for its connecting scheme and it was found that in the typical low load operating mode in winter when the interconnection lines between HN power grid and the NF power grid were disconnected, the QZ pumped-storage power station had some stability problems in the pumping mode. The instability mechanism was analyzed according to the stability curves in the situation when HN power grid and the NF power grid were interconnected or disconnected and the problem was identified as transient stability problem. Several measures were proposed for solving the stability problems according to the factors that affect the transient stability of the power system and the actual situation of the HN power system and the QZ pumped-storage units. Quantitative analysis was conducted for the measures implemented, which can provide a reference for the emergency plan and the dispatching operation of the QZ pumped-storage power plant.%介绍HN省计划建设的QZ抽水蓄能电站概况和接入系统推荐方案.结合电网的实际情况选择合理的运行方式,对QZ抽水蓄能电站接入系统方案进行潮流、稳定计算,发现NF电网至HN电网联网工程(简称联网线)断开(孤网运行)情况下,冬季小负荷方式QZ抽水蓄能电站抽水工况存在一定程度的稳定问题,结合联网、孤网方式的稳定曲线分析了失稳机理,确定为暂态失稳问题.根据影响系统暂态稳定性的因素,结合HN电网及QZ抽水蓄能机组的实际情况,提出了解决该稳定问题的若干可行措施,并通过稳定计算定量分析措施实施的力度,为QZ抽水蓄能电站投运后的事故预案及调度运行提供参考.
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