智能交流接触器自校正控制技术

The Control Technology of Self-correction for Intelligent AC Contactors

将电力电子传统的电压控制模式及Buck电路经改造应用于交流接触器的智能控制中,实现了智能交流接触器的闭环控制。在此基础上,提出了加入主触头状态捕捉电路的自校正控制方案,分析自校正控制的工作原理,采用电流扫描方式实现自校正控制,使智能交流接触器具有起动过程自校正功能,减少了智能交流接触器起动过程中的触头弹跳。通过对自校正参数的记忆,精确复现起动电流,减少了智能交流接触器在线运行的触头弹跳。该控制方案对接触器本体的结构参数依赖较低,对输入电压波动不敏感,可以自动调整吸力特性,不需要对接触器进行复杂的建模仿真即可完成相对优化的过程控制,提高智能交流接触器的电寿命,结合相关实验验证了方案的有效性。

This paper applied the voltage control mode and the transformed buck circuit into the intelligent control of the ac contactor and realized closed-loop control. On this basis, a self-correction control scheme with the state capture circuit of main contacts has been proposed. This paper analyzed the principle of the self-correction control and realized it by current scanning. The control scheme can reduce the bounces of the ac contactor in making process with the offline self-correction. Through memory the offline self-correction parameters, the control module can recurrence the making coil current accurately. This control scheme relies less on the structure parameters of the ac contactor and is not sensitive to the input voltage fluctuation. The intelligent ac contactor can adjust the attractive force automatically and enhance the electrical life of the ac contactor. The complex modeling and simulation is not necessary during the optimal control. The experimental results verify the validity of the control scheme.