特高压输电线路工频过电压抑制的研究

Study of Power Frequency Overvoltage Suppression on UHV Transmission Line

主要研究了晋东南到荆门的特高压输电线路过电压水平的改善措施。在ATP仿真基础上对单回运行方式下单相接地甩负荷过电压和无故障甩负荷过电压进行了分析,在此基础上提出限制工频过电压的措施。通过EMTP仿真,比较了不同无功补偿点限制工频过电压措施的优缺点,提出了最优限制工频过电压的方案。结果表明,全线路各段选用不同补偿方法的运行方式对过电压抑制起到一定的作用。

It mainly studied the improvement measures of overvoltage level for UHV transmission line from Jindongnan to Jingmen. It analyzed single-phase grounding load shedding overvoltage and fault-free load shedding overvoltage in the case of the single operation mode based on the ATP simulation. The measures of overvoltage limit were accordingly presented and the best one was proposed through comparison of the pros and cons of all the measures based on different reactive power compensation points in EMTP simulation. The results show that the operation modes in various compensation methods selected from all segments of the whole line have a certain effect on the overvoltage suppression.