直流低负荷无功优化与直流线路再启动的配合

Analysis on Reactive Power Optimization for Low Load and Re-start of Jinzhong DC Line

金中直流输电工程的无功控制策略里采用了低负荷无功优化功能,作为低负荷运行时,通过降低直流电压,增大换流器的无功消耗,以减小换流站向系统注入的无功。低负荷无功优化激活后会根据预先制定的曲线降低直流电压,而线路故障重启后也会有一个电压参考值。本文针对这两个电压参考值的配合问题进行分析,采用RTDS仿真系统对两个功能之间的配合进行模拟。针对仿真试验结果,确定以较低的电压值作为最终参考值,避免电压反复升降,破坏电网的稳定性。

Reactive control strategy of JinZhong HVDC project used in low-load reactive power optimization function, operating as a low load, by lowering the DC voltage converter increases the reactive power consumption, to reduce the converter station to the system implantation reactive. Low load reactive optimized activation will reduce the DC voltage in accordance with pre-established curve, but after a line fault restart will have a voltage reference value. In this paper, analyzing this assorted problem for two voltage reference value using RTDS simulation system simulate the cooperation between the two functions. For the simulation test results to determine a lower value as the ultimate reference voltage value, to avoid the voltage repeatedly lifting and undermine the stability of the grid.