Tracking control of vacuum circuit breaker based on the control law with nonlinear correction function

For phase-controlled vacuum breakers, the acting time of Permanent Magnetic Actuator (PMA) should be precise. The variation of capacitor voltage, jamming, temperature, etc. (called disturbance factors) impact the dispersion of closing time seriously. Tracking control is used to suppress this dispersion. However, PMA is a nonlinear, high-order complex system. The control process is dynamic following control. Therefore, the dispersion suppression capability of conventional controllers faces challenges. In order to solve this problems, a new technology has been putforward in this paper. By using this technology, the response speed and anti-interference ability of the control system are improved. The time scatter is better suppressed. The current-displacement double closed-loop controller (CDCC) based on inverse system method is proposed. During the motion stage, the dynamic characteristics of the controller can be optimized by using the inverse systems to correct the output of the automatic displacement regulator (ADR) and the automatic current regulator (ACR). The simulation system is established and the performance of different control methods commonly used in phase control is compared. Based on the aforementioned theory, many experiments have been performed when disturbance factors change, such as capacitor voltage, environment temperature, and so on. The results prove that the current deviation and the displacement deviation can be corrected under severe conditions and the closing time can be stabilized within ±0.5 ms. Therefore, the anti-interference ability and dynamic performance of PMA are ensured when external factors change drastically, which will increase the accuracy of the phase-controlled operation and prolong the lifespan of circuit breaker.