Double integral sliding mode control of a Buck-Boost voltage balancer

Abstract

The bipolar DC micro-grid based on the Buck-Boost voltage balancer framework has been widely studied. The effective control voltage balancer keeps the positive and negative voltage of the system equal, to ensure the power quality of the system. Aiming at the control of Buck-Boost voltage balancer, a double integral sliding mode controller is designed. This method takes into account the nonlinearity and dynamic state of the system, and adopts double integral sliding surface to reduce the steady-state error. The experimental results show that compared with the traditional PI controller, the controller designed in this paper can effectively shorten the dynamic adjustment time and reduce the difference between positive and negative voltage.

Keywords

• Buck-Boost voltage balancer; bipolar DC micro-grid; double integral sliding mode controller