Optimal reactive power control for dual‐active‐bridge converter using improved dual‐phase‐shift modulation strategy for electric vehicle application

Abstract

Dual active bridge (DAB) based DC-DC converters are in high demand for offering quick charging capacity to Electric vehicles (EVs). The conventional technique for DAB is based on single-phase-shift (SPS), though it provides simple control but suffers from high peaking in the inductor current under varying charging rates for EV and dc-link voltage ratio. In this paper, initially the expression for optimal reactive power flow into DAB converter under SPS and dual phase-shift (DPS) control techniques are thoroughly examined. Based on the analytical analysis, an improved dual-phase-shift modulation (IDPSM) method for real and reactive power control through a DAB converter is proposed for varying charging rates of an EV and dc-link voltage ratio. The proposed IDPSM control technique is implemented using the inverse perturb and observe (IPO) method that provides optimum inner phase-shift between the legs of the H-bridge to track minimum reactive power or back power flow into the system. This method automatically adjusts the inner and outer phase shift ratios under different loading conditions. Further, the proposed IDPSM scheme enhances the range of ZVS operation even under light load conditions, which is lacking with the conventional control techniques. The Lyapunov theory used to determine the stability of the DAB DC/DC converter. To validate the proposed control scheme, a detailed simulation is carried out using MATLAB/Simulink with a 2 kW system under varying charging rates of an EV. Further, to support the effectiveness of the proposed scheme, a comparison with different phase shift modulation schemes is also presented. Finally, an experimental prototype for DAB is developed to confirm the feasibility of the control technique. K E Y W O R D Sdual active bridge (DAB), dual-phase-shift (DPS), electric vehicle (EV), improved dualphase-shift modulation (IDPSM), reactive power, single-phase-shift (SPS)

Photovoltaic and Battery sourced Multiport Converter fed Dual Active Bridge DC/DC converter with Multimode operation for Off-grid Electric Vehicle Charging Application

“…5(a). The time domain based linear piecewise analysis of the DAB converter is reported in [19]. The inductor current (i L ) at different instants of time and its average value with SPS control are given below.…”

“…The stability analysis and derivation of the state-space model for the dual active bridge (DAB) DC-DC converter have been thoroughly discussed in [19].…”

“…Advanced DPS control schemes are also advocated in the literature to achieve the global optimal efficiency of the DAB converter. But their implementation of the DPS algorithm requires more computations [19,20].…”

Phase shift control of dual active bridge DC‐DC converter based on feedforward compensation and transient optimization strategy

“…The SPS control strategy of the DAB converter is the simplest, but it not only lacks flexibility in power regulation but also brings additional stress to the switching devices in the converter [8][9][10] ; the DAB converter based on SPS control produces the return power of the DAB converter that is relatively large, which will inevitably lead to a decrease in efficiency, and at light load or even zero power transmission, the inherent soft switching properties of the DAB converter may fail, which will cause transmission power loss 7 ; Guan et al 11 expounds the mechanism and suppression method of backflow power, but this method cannot reduce the current stress; Chen et al 12 consider the magnetizing inductance and can realize full-load zero voltage switching (ZVS) under SPS control. By introducing an inner phase shift to suppress the backflow power, it can even eliminate the backflow power and can realize full-load ZVS from the control strategy, which forms various control strategies: EPS control, 13 DPS control, [14][15][16] and TPS control. 17 Compared with EPS, DPS which can not only reduce the requirements for switching devices and reduce losses but also improve the efficiency of the converter.…”

A quintuple phase shift modulation scheme in multilevel dual active bridge converter for battery energy storage system

“…There are also other modulation schemes such as hybrid modulation, 10 dual-phase shift modulation, 11 unified TPS, 12 and so on. Some of the advanced modulation schemes for the current stress optimization strategies are discussed in Huang et al 12 and Hou et al, 13 reduction in zero circulating currents are dealt in Karthikeyan and Gupta 14 and Chilakalapudi and Kumar, 15 improvement in the soft switching region are described in Riedel et al 16 and Kirsten et al, 17 and improvement in the dynamic response of the converter are explained in Takagi and Fujita 18 and Guacaneme et al 19 Similarly, the most common circuit modification is resonant converters. [20][21][22] In Karthikeyan and Gupta, 23 a front end and rear end switch are introduced in DAB, eliminating the input and output sides' circulating current.…”