以京津唐—河北南网—山西电网3区域互联电网为研究对象，对山西—荆门特高压输电线路故障跳闸后互联电网的频率响应和联络线功率变化特性进行了仿真分析，研究了一次调频相关参数对电网安全稳定性的影响，结果表明，等效调速不等率、控制系统延时、电网转动惯性时间等参数对电网频率稳定性影响较大，研究结果可为提高特高压电网一次调频稳定性提供参考。

Primary Frequency Regulation (PFR) can rapidly respond to disturbances or accidents, thus power system frequency deviation can be effectively eliminated and both security and stability of power system can be ensured. In this paper taking the three region interconnected power grid, namely the interconnected Beijing-Tianjin-Tanshan power grid, the Southern Hebei power grid and Shanxi power grid, as research object, the frequency response of the three region interconnected power grid and the tie-line power variation characteristic after the fault caused trip-out of the UHV transmission line from South Shanxi to Jingmen due to fault are researched. The impact of parameters related to PER on security and stability of the three region interconnected power grid is analyzed. Results of this research are available for reference in enhancing the stability of PER for extra high voltage (EHV) power grid.

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