发电机无功功率与系统稳定运行

Generator Reactive Power and Power System Stability

首先阐述了发电机无功功率的产生, 接着从原理上详细分析发电机无功功率对电力系统的静态功角稳定、静态电压稳定、低频振荡和动态电压稳定的影响, 指出发电机少发无功功率不利于系统的静态功角稳定, 发电机全相或进相运行不利于系统的静态电压稳定; 两台电气距离较近的发电机运行方式相差较大, 可能引起系统低频振荡;发电机进相运行将引起系统动态电压稳定的不稳定, 并通过试验系统进行了验证。结果表明, 发电机无功功率对系统的静态功角稳定、静态电压稳定、低频振荡和动态电压稳定具有重要的影响, 因此系统在实际运行中应该合理调整发电机无功功率, 以保证系统的安全经济运行。

The generator reactive power has great influence on power system stability. This paper first expatiates the produce of reactive power. Then it makes a detailed analysis of its influence on static angle stability, static voltage stability, low frequency oscillation, and dynamical voltage stability. It indicates that when the reactive power of generator is not enough, it will be unfavorable to static angle stability. The generator, which is excelled operated or generate no reactive, is also unfavorable to static voltage stability. When the discrepancy between the operating models of two generators is too large, it can cause low frequency oscillation. When the generator is excelled operated, it can bring dynamic voltage instability. And testing system proves that. The result indicates that the reactive power of generator has great effect on static angle stability, static voltage stability, low frequency oscillation, and dynamical voltage stability. So it is important to adjust generator reactive power in order to guarantee power system security and economy.