摘要
根据带并联电抗器的超高压输电线路发生瞬时性和永久性单相短路故障时,故障相恢复电压周期性不同特点,提出了通过将间隔半个工频周期的恢复电压瞬时值相加消除工频分量,并应用Prony曲线拟合算法获取瞬时性故障时恢复电压自由衰减分量的幅值的方法。应用获得的自由衰减分量幅值区分故障类型。理论分析和仿真实验表明该判据具有较高的可靠性和灵敏度。
According to the different periodicity of recovery voltage in permanent fault and transient fault,a novel method to distinguish fault type is proposed.The method eliminates the system frequency component through adding the instantaneous value of recovery voltage at half a cycle interval firstly,and then uses Prony fit method to obtain the amplitude of the free decay component of recovery voltage in transient fault.The obtained amplitude can be used to distinguish fault type.Theoretical analysis and simulation results show that the criterion has a higher reliability and sensitivity.
出处
《四川电力技术》
2011年第1期16-20,共5页
Sichuan Electric Power Technology
