Abstract:Buck-Boost converter may cause system oscillation under constant power load. In order to ensure the stable operation of the system, a new passive compound controller is designed based on the port-controlled Hamiltonian model. Firstly, the tangent function is used to improve the nonlinear state error feedback control, and the inner loop controller of passive control is updated to obtain the expected current value, so as to improve the dynamic performance of the system and reduce the static error. Secondly, POPOV's superstability theorem is used to optimize the outer loop controller of passive control to ensure that the output of passive control can be stable under internal disturbance or external disturbance. Then, by comparing the designed new passive composite controller with three classical passive control methods, it is concluded that the new passive composite controller can not only improve the anti-interference ability of the system, but also solve the problem that overshoot and rapidity cannot be coordinated. Finally, an experimental platform is used to verify the feasibility of the proposed algorithm.
