基于线圈电流的永磁真空断路器控制方法

Control Method for Permanent Magnetic Vacuum Circuit Breaker Based on Coil Current

为使永磁真空断路器(VCB)分合闸的动作时间保持一致,实现可靠的同步关合,基于永磁机构(PMA)的动态特性,分析了动触头在不同运动阶段下的线圈电流,以及参考电流曲线的获取方法。基于Simulink控制模型,通过改进滞环控制方法有效实现了对参考电流曲线的跟踪。为检验控制算法,设计了以ARM处理器为核心的智能控制器,通过选取3种不同容量的储能电容,在150～200V电压范围内进行了断路器的分合闸实验。结果表明,基于上述控制原理设计的控制器可以有效控制断路器的动触头的行程轨迹,使动触头的运动轨迹与参考电流曲线的运动轨迹保持一致;在选定的线圈参考电流曲线下,实际断路器分合闸的动作时间的误差≤0.3ms。

In order to keep action time of opening and closing vacuum circuit breaker （VCB） consistent and to realize synchronous control with more reliability, current in coil of moving contact was analyzed at different status based on the dynamic behavior of permanent magnetic actuator （PMA}. A method for obtaining reference current curves was also proposed： the tracking of reference current curve was realized by using an improved algorithm of hysteresis control based on a Simulink control model. Moreover, an intelligent controller based on ARM processor was designed to test the efficiency of the proposed control method. Experiments of opening and closing VCB were performed with capacitors of three different capacitances, of which the initial voltages ranged within 150-200 V. The results show that the controller designed with the new method can effectively control the track of moving contact, which is close to the track of reference current curve. With the selected reference current curve of coil in the experimental VCB, the action time difference between opening and closing VCB is less than 0.3 ms.