带能量回馈功能的永磁机构驱动控制器

Driving Controller With Energy Feedback for Permanent Magnet Actuator

提出了一种带有能量回馈功能的永磁机构驱动器。首先,针对双线圈单稳态永磁机构断路器分闸时,驱动器的IGBT通电时间短、线圈电感变化小的特点,进行了电路简化,列出电路充放电微分方程,求得解析式;提出了气隙线性变化模型,推导了合闸过程中电感剧烈变化情况下的二阶变系数微分方程,并通过龙格-库塔法和Matlab数学软件,得到了方程的数值解,从而得到电流、电压曲线和能量回收率。然后对重合闸情况下的电容充电时间进行计算,由于能量回馈功能的引入,使得重合闸情况下电容快速充电至分闸允许电压,提高了重合闸可靠性,达到了节约能量和减小充电器功率的目的。同时通过检测分合闸电容电压来控制IGBT导通时间,维持稳定的机械特性。最后结合实验验证了本文设计方法的有效性和适用性。

A permanent magnetic actuator driving controller with energy feedback is proposed in this paper.Firstly,according to the characteristic of the driving device—the turn-on time of the IGBT is shortened and the coil inductance will not vary too much when the monostable permanent magnetic actuator breaker with dual coil is opening—the circuit is simplified,and the charging and discharging differential equations are built and the analytical expressionsare given out.The model of the linear change of air gap is presented.The second-order ordinary differential equations are deduced when the inductance changes dramatically in the process of closing.The numerical solutions of equations,the current and voltage curves and energy recovery are obtained through Runge-Kutta method and Matlab.Secondly,the charging time is calculated when reclosing.The capacitance voltage is quickly charged to the permission value and the reliability of the reclosing is improvedby the function of energy feedback which achieves the purpose of saving energy and reducingthe power ofcharger.By measuring the capacitance voltage to control the IGBT turn-on time,the driving device can maintain the stability of the breaker＇s mechanical properties.Finally,the performance of the intelligent device is verified in the experiment.