Adoption of controlled switching technology can suppress the transient process of power system

achieve the motion of the displacement of the circuit breaker in accordance with a given curve

reduce the closing dispersion and improve the precision of the phase selection. The traditional controlled switching of permanent magnet Actuator（PMA）adopting the black box control model has such problems as difficult selection of controller parameters and low control precision etc. To this end

the internal mathematical model of PMA is set up to couple the electromagnetic field and the force field and design a double closed loop controller. The simulation control model is set up in Simulink to change external capacitive voltage. Compared with the traditional black box control model

the double closed loop control model has higher precision. Meanwhile

the DSP28335 is used as the main control chip to design the hardware control system

set up the experimental platform and perform a large number of closing control experiments.The experimental results show that adoption of above-mentioned control strategy can achieve effectively the displacement tracking control of the circuit breaker and can control dispersion of closing time of the circuit breaker within ±0.5 ms.