Sliding-mode control of a CuK converter for voltage regulation of a dc-bus

Abstract The voltage regulation of a dc-bus by charging/discharging a battery is required for different applications like microgrids and electric vehicles. However, most of the charging/discharging systems reported in scientific literature provide discontinuous currents to the battery or the dc-bus and use linear controllers. This paper proposes a charging/discharging system to regulate the voltage of a dc-bus, which is formed by a Cuk converter and a sliding-mode controller. The Cuk converter provides continuous currents for the battery and the dc-bus, while the controller guarantees the system stability and fast dynamic response for all the operating conditions. The paper includes the transversality, reachability, and equivalent control analysis of the proposed controller as well as a design procedure of the converter and the sliding-mode controller. Additionally, the controller implementation and hysteresis band design are also introduced. The proposed system is simulated in PSIM and the results validate the design procedures and show that the proposed system satisfies the design requirements. Moreover, the results show the capacity of the proposed system to regulate the dc-bus with voltages less or greater than the battery voltage with a single sliding-mode controller.

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