Research on DC Bias Suppression of Dual Active Bridge Used in DC Distribution Network

doi:10.16628/j.cnki.2095-8188.2021.09.015

Abstract

Abstract:

During the power transmission process of the dual-active-bridge DC-DC converter based on phase shift control,when the phase shift angle or load transient causes the inductor current and the transformer excitation current to generate a transient DC bias,which causes current stress in the switching device increase and the problem of transformer magnetic saturation.The traditional single-phase-shift control uses a 50% duty cycle square wave signal to operate the switches on the diagonal side of the primary and secondary H bridges simultaneously.In this paper,by analyzing the generation principle of the DC bias it can achieve the needful switching action to eliminated the problem of DC bias.A new switch independent (SID) control method is proposed to achieve a new steady state and eliminate DC bias within half a switching cycle.The simulation of MATLAB/Simulink verifies the feasibility of the proposed control method.

Key words: dual-active-bridge (DAB), transient process, DC bias, single-phase-shift (SPS) control, switch independent (SID) control

CLC Number:

TM732

HAN Wenhui. Research on DC Bias Suppression of Dual Active Bridge Used in DC Distribution Network[J]. LOW VOLTAGE APPARATUS, 2021, 0(9): 91-99.

Figures/Tables 18

References 16

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参数	数值	参数	数值
输入电压U₁/V	240	变压器励磁电感L₀/mH	2.4
输出电压U₂/V	270	输出电容C₂/μF	15
变压器变比N	5/6	开关频率/kHz	20
一次侧电感L₁/μH	0	采样频率/kHz	40
二次侧电感L₂/μH	60	仿真步长/s	2e-8

参数	数值
比例增益K_p	0.2
积分时间常数T_i	2 000