特高压近区风电汇集地区次同步振荡特征及防控措施

Subsynchronous Oscillation Features and Control Measures for Wind Power Influx Area near HVDC

特高压近区的新能源汇集区域中,广泛使用的电力电子设备容易产生大量次同步谐波,引发电力系统次同步振荡现象。以新疆哈密±800 kV特高压近区的风电集中接入地区次同步案例为切入点,开展振荡特征和振荡关联因素分析,提出次同步振荡监测、控制、抑制3项措施。经实际应用表明,监测及控制系统可有效监控振荡发生,并抑制直流近区风电汇集区域的次同步振荡发生,提高电网的运行可靠性。

The power electronic devices which are widely used in wind power influx area,especially near the HVDC area,can easily produce a large number of subsynchronous harmonic.According to the subsynchronous oscillation problem that emerged in the wind power integration areas near the±800 kV HVDC in Hami,Xinjiang,the oscillation features and influence factors are analyzed to propose three measures to monitor,control and prevent subsynchronous oscillation.Experimental results show that the subsynchronous oscillation can be accurately detected by using the monitoring system and effectively prevented by taking the control measures,ensuring stable operation of the power grid.