Research on the Operating Mechanism of 220 kV Circuit Breaker Motor Controlled by MPC+PID

Abstract

The direct drive circuit breaker by permanent magnet synchronous motor is a new servo technology that can drive the moving contact to complete the opening and closing operation along the optimal path. A 220 kV double break operation model considering servo motor control is proposed to address the challenges of difficult opening, fast closing speed, and sudden changes in load torque of 220 kV vacuum circuit breakers. This study designed a circuit breaker opening planning curve based on the opening characteristics of the circuit breaker, and constructed kinematic and dynamic models of high-power switches and transmission mechanisms to determine the maximum torque, rated capacity, and performance characteristics required by the motor when the circuit breaker is opened. In addition, a permanent magnet synchronous motor model considering time-varying inertia was constructed using Matlab/Simulink software. This article proposes a model predictive control (MPC) + PID motor control model for multi-stage optimization control of stroke curves. The results show that the designed motor operating mechanism model meets the technical requirements of the arc extinguishing chamber operating mechanism, and the stroke curve gap distance is less than 5%. Compared with PID control alone, this method has more accuracy and stability.