暂态稳定视角下的最佳重合闸时间及其在线整定

Optimal reclosing time orienting to transient stability and its online setting

基于双机等值方法提出整定最佳重合闸时间(ORCT)的绝对动能判据,构建了反映重合后系统稳定程度的指标。结合广域测量系统(WAMS)实时采集的数据,采用曲线特征拟合法对故障后发电机等值角速度进行在线预测,给出一种最佳重合闸时间的在线整定方法。算例仿真表明,所提方法能在线预测出最佳重合闸时间,且能够抑制系统振荡,有效提高了系统暂态稳定性。稳定指标也验证了所提方法的合理性。

The absolute kinetic energy criterion of ORCT（Optimal Reclosing Time） is proposed based on the two-machine equivalence method and an index is built to reflect the stability of post-reclosing system. The curve feature fitting method is adopted to online predict the equivalent angular velocity of post-fault generator according to the real-time data measured by the wide area measurement system,and a method of online ORCT setting is given. Case simulation shows that,the proposed method online predicts the ORCT and suppresses the system oscillation,which enhances the system transient stability. The stability index verifies the reasonability of the proposed method.