非自治铁磁谐振电路过电压脉冲时滞同步抑制方法研究

Overvoltage Suppression by Impulsive Time-Lagging Synchronization of Non-Autonomous Ferroresonance Chaotic Circuit

针对铁磁谐振事故产生的过电压会对电力设备产生危害的问题,从对一典型铁磁谐振电路的非线性特性分析入手,并考虑铁磁谐振过电压从检测到加入抑制措施会产生一定的时滞,提出了一种考虑时滞因素的脉冲同步铁磁谐振抑制方法。该控制方法可以使得发生谐振的电路系统与正常工作系统实现同步,从而抑制铁磁谐振过电压的幅值,降低系统风险。利用Simulink软件对提出的控制方法进行仿真计算,结果表明:不考虑时滞因素加入脉冲控制,系统达到同步状态所需时间约为1.5s,加入时滞后脉冲同步所需时间约为1.0s,同步所需时间能够缩短33%;通过和未考虑时滞因素的常规脉冲同步方法进行对比及对电路中非线性电感两端电压的监测,表明该方法能够快速有效地实现铁磁谐振过电压的同步抑制。研究工作为保障电力系统安全提供了新的思路。

Focusing on overvoltage due to ferroresonance in power equipment,a new suppressing strategy is proposed.By taking notice of the nonlinear characteristics of a non-autonomous ferroresonance chaotic circuit and the lagging of exerting suppression behind ferroresonance detecting,an impulsive delay feedback is considered to synchronize the ferroresonance system with normal system to suppress overvoltage.The Simulink simulation indicates that the newly proposed strategy enables to shorten the synchronization period by 33％ compared with the common schemes ignoring lagging effect.