智能接触器准临界电流搜索自起动控制  

Self-starting control with quasi-critical current search for intelligent contactor

作　　者：庄杰榕 许志红[1] ZHUANG Jie-rong;XU Zhi-hong(School of Electrical Engineering, Fuzhou University, Fuzhou 350116, China)

机构地区：[1]福州大学电气工程与自动化学院

出　　处：《电机与控制学报》2019年第6期73-80,共8页Electric Machines and Control

基　　金：国家自然科学基金(51277039);福建省科技厅高校产学合作项目(2016H6008);福建省自然科学基金(2017J05076)

摘　　要：提出一种智能接触器准临界电流自起动控制策略。通过分析电流强迫下跌现象,推导维持电流闭环的约束条件,建立了反映触头运动状态的通用反馈信号,将下降拐点处的线圈电流定义为准临界起动电流;采用模糊观测,为不同容量的接触器首次起动提供电流初值;设计双极性数字电流闭环,基于高动态响应的电流在线搜索,不断逼近当前工况下的起动临界电流,实现吸反力良好配合的自起动过程控制。所提控制策略能够自适应获取准临界起动电流,抑制触头弹跳,对本体参数变化、电压波动不敏感,兼具卡涩故障警报、线圈过流保护等优点;相关仿真及实验验证了控制策略的有效性。A self-starting control strategy with quasi-critical current for intelligent contactor is proposed. The forced down phenomenon of coil current was analyzed and the constraint condition for current closed-loop was inferred. Then, the universal feedback signal of movement of contacts was established. Thus the quasi-critical starting current was obtained when turning point occurred. By fuzzy observation, the starting current for contactor of different capacity was provided for the first time. A digital closed-loop control method with opposite polarity voltage was designed. The high response online current search was used to approach critical starting current under the current working condition, in order to realize self-starting process control with coordination between attraction and counter-force. The proposed control strategy which is insensitive of contactor parameters change and voltage fluctuation, can adaptively search for the quasi-critical current to suppress the contact bounce. And it has advantages of starting block fault alarm, coil overcurrent protection and so on. The effectiveness of the control strategy is verified by related simulations and experiments.

关 键 词：数字闭环 下降拐点 自起动 准临界电流 模糊观测 

分 类 号：TM572[电气工程—电器]