试论机组跳闸对电网频率及电压稳定性的影响

Influence of Unit Trip on Power Grid Frequency and Voltage Stability

电力供应事关国民经济发展全局,也决定着居民生活质量,而机组跳闸则会对电力稳定供应带来直接影响。在容量较小的电力系统中机组跳闸势必会对系统运行带来严重影响,低频切负荷虽然维持电网频率的稳定却会导致无功功率大幅增加,电压瞬间激增,反之切除负荷量过多又会导致电压稳定性严重下降,容易损毁设备。本文从机组跳闸作为研究的切入点,分析了机组跳闸后对电网频率以及电压稳定性所带来的不良影响并据此探讨了电抗器应用效果,为电网安全平稳运行提供帮助。

The supply of electricity is related to the overall economic development of the country and the quality of life of the residents. However, the unit trip will have a direct impact on the stable supply of electricity. In a smaller power system, the unit trip will inevitably have a serious impact on the system operation. Although the low frequency load shedding maintains the stability of the grid frequency, the reactive power will increase sharply and the voltage surge instantaneously. On the contrary, if the load is cut too much, Resulting in a serious decline in voltage stability, easy to damage the device. In this paper, the tripping of the unit is taken as the starting point of the study. The adverse effects on the frequency and the voltage stability after the tripping of the unit are analyzed. The application effect of the reactor is discussed to provide help for the safe and stable operation of the power network.