750 kV电网局部谐波谐振及抑制策略研究

750 kV输电系统广泛分布于西北电网，具有传输容量大、输送距离远、经济效益好的特点，但同时也存在线路分布电容大、故障时高频分量多、直流分量及谐波分量衰减缓慢等影响因素。结合实际电网参数及实测数据，对电网中发生的局部2次谐波谐振现象的产生机理进行了研究，并针对750 kV变压器空载合闸时产生的2次谐波在电网中的传递进行了分析，计算了相关750 kV母线的谐波阻抗，分析了可能的治理措施，为输电系统的安全稳定运行提供参考。

Research on Harmonic Resonance and the Suppression Strategy in Partial 750 kV AC Transmission System

750 kV transmission system is widely distributed in the Northwest Power Grid. It has the characteristics of large transmission capacity, long-transmission distance and good economic benefit. But there also have the influencing factors such as large distributed capacitance, rich high-frequency component when there is a failure, and slow attenuation of DC aperiodic component, etc. Based on the phenomenon of the 2nd harmonic partial resonance overvoltage, the mechanism is analyzed. Combining with the net parameters and the monitoring data, the transmitting of the harmonic produced by the 750 kV transformer switching with no-load is analyzed, and the harmonic impedances of the 750 kV bus are computed, then some suggestions are given. The result can be the reference to ensure the safe and stable operation of the transmission system.