±800kV锦苏特高压直流双极闭锁对江苏电网受端系统稳定性的影响

Impact of Bipolar Blocking in ± 800kV Jinsu UHVDC Power Transmission System on Stability of Jiangsu Grid's Receiving-End System

为了研究锦苏特高压直流发生双极闭锁后可能对江苏电网造成的影响,基于江苏电网2013年夏高负荷典型数据,采用电力系统全数字仿真系统(advanced digital power system simulator,ADPSS),从多个角度研究锦屏—苏南±800 kV特高压直流在输送4 000 MW功率的情况下双极闭锁对江苏电网受端系统稳定性可能产生的影响。研究结果表明:锦苏直流发生双极闭锁后,苏南重要通道未出现超稳定限额的情况;同里换流站周边主力机组能够保持功角稳定性;闭锁后,苏南500 kV变电站母线电压波动显著,但江苏电网仍能保持稳定运行;直流闭锁期间江苏电网频率有小幅跌落,仍能保持频率稳定。研究结果对于直流受端江苏电网的安全稳定运行研究具有一定的参考意义。

In order to study the impact of bipolar blocking in ± 800 kV UHVDC power transmission system from Jinping to southern Jiangsu on the stability of receiving-end system in Jiangsu power grid, the possible influence of bipolar blocking with transmission power of 4 000 MW on the stability of receiving-end system in Jiangsu power grid were researched from various aspects by using advanced digital power system simulator （ADPSS）, based on the typical data of peak load in Jiangsu power grid in the summer of 2013. The research results show that the stability over-limit didn＇t happen in the key transmission channels of southern Jiangsu after bipolar blocking; the generators near Tongli converter station could maintain the power angle stability; bus voltage of 500 kV southern Jiangsu converter station had a significant Voltage fluctuations after bipolar blocking, but Jiangsu grid could still maintain stable operation; the frequency of Jiangsu grid had a slight drop after bipolar blocking, however the frequency stability could still be maintained. The research results have practical significance to the research on the security and stability of receiving-end system in Jiangsu power grid.