智能电磁接触器吸合过程RBR控制策略

RBR Control Strategy for the Closing Process of Intelligent Electromagnetic Contactor

基于批次对批次(run-by-run,RBR)控制方式对电磁接触器的吸合过程展开研究,旨在不改变接触器自身机械结构参数的前提下从算法角度实现接触器的动作时间及弹跳控制。通过利用电磁接触器重复操作的特性,研究RBR方法应用于接触器开关的特殊性,据此构建接触器吸合过程的RBR控制优化数学模型,提出完整的控制流程并给出励磁电流及其作用时间的设定准则。模型不依赖接触器的具体参数,通用性强;引入损失函数对接触器的历史操作信息进行反馈评估与分析,滚动优化过程模型并调整控制决策,迭代求解吸合过程的线圈电流闭环参考序列,改变依赖离线获得的最优参量始终指导接触器在线时变运行的局限;为使控制策略不局限于一个最优解,兼顾接触器在运行过程中由于时变、干扰等引起的不确定性,引入决策向量备选矩阵,始终把新的优化建立在实际的基础上,使控制保持实际上的最优;相关仿真及实验验证了控制策略的有效性,能有效减小吸合时间的动作分散性并抑制触头弹跳,对接触器的吸合过程智能控制具有普遍意义。

Based on the run-by-run(RBR) control method,this paper studies the closing process of electromagnetic contactor. The purpose of this work is to control the contact bounce and closing time without changing any structure of the contactor. We focus on the speciality of the RBR method applied to the contactor by using the repetitive functioning of electromagnetic contactor. Based on this, the RBR control optimization mathematical model of contactor’s closing process was constructed, a complete control flow was proposed and the excitation current and its action time were set. The model does not depend on the specific parameters of the contactor and is highly versatile. The loss function for evaluating the historical operation information of contactor was introduced, which automatically optimize process model and adjust control decisions, and the coil current closed-loop reference sequence of the closing process is iteratively solved, changes the limitations that contactor online operating depends on off-line parameters. In order to make control strategy not limited to an optimal solution, taking into account the uncertainty caused by time-varying, interference,during the operation of the contactor,the decision vector candidate matrix is introduced, always build new optimizations on practical basis so that control remains practically optimal. Related simulation and experiment prove the effectiveness of the proposed strategy, which can effectively reduce the dispersion of the closing time and the bounce of the contact. The research has universal significance for the intelligent control of contactor’s closing process.