Auto-disturbance-rejection start-up control of three-stage synchronous machines

Because of the randomness of the environment and aerodynamic effects, aircraft engines in the startup process exhibit various load characteristics. Therefore, a stable startup performance is difficult to be achieved if the PID control strategy is used. To solve this problem, we analyze the startup control mathematical model of a three-stage brushless synchronous machine, and apply the active-disturbances-rejection control technology to the design of controllers in the current loop, speed loop and angle loop, which are used to suppress the influence of the unknown external disturbances and the coupling items in current and electromagnetic torque models. The simulation and experimental results show that the new startup control strategy, compared with the PID control method, has higher ability in disturbance rejection and better startup acceleration performance under different operation conditions.