Title : Feasible Performance Evaluations of Digitally-Controlled Auxiliary Resonant Commutation Snubber-Assisted Three Phase Vo

International Journal of Industrial Electronics, Control and Optimization . © 2021 IECO. 258 current’s assumption are the defects of this controller. In [9], the sliding mode controller for a single-switch cascade converter is proposed. The constant input reference current assumption is the main defect of this controller. In [10], a 3-stage controller with a Dual Active Bridge (DAB) is proposed. The first stage has the Power Factor Correction (PFC) function, and the controller strategy is based on the status of DC link voltage proportional with the instantaneous SOC. Therefore, the controller is complicated and cannot be used in the other input power supplies. In [11], an on-board EVBC is proposed with a compensator consisting of zeta and boost converters cascaded with the Cuk converter. The compensator is used to decrease current and voltage ripples to descend the filter capacitor size resulting in the complication of the controller. In [12], a non-PWM sliding mode controller for a Sheppard-Taylor converter in presented. The reference current proportional with the voltage error is considered. Because of using the non-PWM sliding mode controller, the switching frequency is variable. A cascade buck and boost are applied in [13] in which different duty cycles with variable phase shift structures are considered. The efficiency and power factor are increased. Moreover, the total harmonic distortion is decreased, but the control system is highly complex. A current control in a buck DC/DC converter by means of a PWM-based sliding mode technique is presented in [14]. The output voltage/input current errors as state variables are applied in sliding surface consideration in this work. Moreover, the input reference current is considered a constant quantity. Therefore, the negative effect of input voltage variations in the converter cannot be controlled. A multi-input EVBC using SMC is presented in [15]. The converter’s structure is well designed, but the applied state variables in the sliding surface are considered unsuitable and insufficient. More state variables should be applied in complex structures such as these certain types of converters. This paper proposes an improved SMC to control a DC/DC boost converter as an EVBC. The integral function of the charging voltage error is considered as the input reference current. Therefore, a more robust structure in the input power supply voltage variations is made by this controller, and this distinctive characteristic allows flexibility in the input voltage level variations. Moreover, a minimal amount of charging voltage error, ripple, and mean displacement percentage can be attained in the proposed controller compared to the other SMCs. This paper consists of seven sections. In section II, a DC/DC boost converter as an EV battery charger is introduced. Section III reviews common sliding mode control approaches. Section IV introduces the proposed controller. In section V, the proposed PWM sliding mode controller simulation results in MATLAB Simulink environment are presented and compared with the other SMCs. Finally, Section VI presents the concluding points. II. DC/DC BOOST CONVERTER AS AN EVBC A general battery charger is designed and constructed by a DC/DC converter in a simple structure. The DC input voltage can be prepared by different kinds of RESs. An AC/DC converter is required to supply the grid-line/wind turbine power to its input. The possible variations in these AC powers may cause trouble in the battery charger. Hint1: General battery chargers have a fixed-level input voltage related to their application, but an EVBC can be supplied by some different types of input power supplies in an EVBC station. Therefore, an EVBC with robustness against input voltage variations can also be used as a general battery charger. Hint2: An AC/DC converter is required in an EVBC station whenever a one-(or three-)phase grid power or a wind turbine is used. Moreover, the input DC voltage variation ranges of EVBC are considered about ten volts in the proposed controller. It is important to mention that the input voltage variation is a cause for the variation of wind/line power. A multi-input DC/DC converter is also required whenever the PV cells are applied to use ancillary batteries beside those cells. The output voltage variation that is applied as an input of the EVBC will be low enough whenever this multi-input converter is well designed. Fig. 1 shows the DC/DC boost EV battery charger's structure with its controller. The voltage and current gain and the duty cycle equations are presented as (1). Fig.1. A schematic diagram of the DC/DC Boost Converter ( 1 ) ; I L I T V 1 on o b D = ;G = = ;G = = 1 D v T V 1 D I s i   where D, Vo, Vi, Ib, IL, GI, Gv, Ton, and Ts are the duty cycle, the output and input voltage, the output and input current, the current and voltage gain, the ON time of the IGBT function duration, and the switching period, respectively. The output Battery