可控串补接入电力系统的运行可靠性研究

Operating Reliability Research of Transmission Line Considering TCSC

建立在概率论与数理统计基础之上的传统可靠性评估方法不能准确反映重载条件下可控串补的接入对输电系统可靠性的影响。结合静态电压稳定中的P-V特性曲线、过负荷保护的动作阀值及停运概率随线路潮流变化的输电线路运行可靠性模型,从运行可靠性的角度提出了含串联补偿装置的输电线路运行可靠性模型,分析了串联补偿对输电线路停运概率随潮流变化曲线的影响。算例通过分析不同补偿度条件下的系统供电可用率,表明若线路长期处于重载运行,增加串联补偿环节可以提高系统的供电可靠性。

On the basis of probability and statistics, traditional reliability theory cannot analyze the reliability level of transmission system when the lines are in heavy load operation. The paper puts forward operating reliability model of line considering TCSC in the view of operating reliability, combined P-V curves, threshold of overload protection and operating reliability model of line. Then the paper analyzes the effect of TCSC on curve of probability changed with power flow. Analyzing the service availability in different condition, the example system proves adding TCSC can raise the reliability level if the lines are in heavy load operation in long-term.