Optimized Control of Dual-active-bridge DC/DC Converter Based Power Electronic Transformer With Dual-phase-shift Control

J. Guan, Yonghai Xu, Mengmeng Zhang, Xu Zhang
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引用次数: 5

Abstract

This paper focused on dual-active-bridge (DAB) DC/DC converter, which is a crucial part of power electronic transformer (PET). Through the analysis of DAB DC/DC converter with single-phase-shift (SPS) control and dual-phase-shift (DPS) control, the concise expressions of transmission power and backflow power are deduced, while the equivalent circuits are given. Aiming to obtain the optimal combination between D1 (inner phase shift ratio) and D2 (outer phase shift ratio), an optimal DPS control scheme is proposed for DPS control by employing an evaluation coefficient to investigate the influence of the disturbances of control variables on the transmission power and backflow power. It can minimize the backflow power and reduce the power losses. Simulation results are provided to validate the correctness of theoretical analysis and the effectiveness of the proposed scheme.
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基于双有源桥式DC/DC变换器的电力电子变压器双移相优化控制
本文主要研究电力电子变压器(PET)的关键部件——双有源电桥(DAB) DC/DC变换器。通过对单相移相(SPS)控制和双相移相(DPS)控制的DAB DC/DC变换器的分析,推导了传输功率和回流功率的简明表达式,并给出了等效电路。以获得D1(内相移比)和D2(外相移比)的最优组合为目标,提出了一种最优DPS控制方案,采用评价系数研究控制变量扰动对传输功率和回流功率的影响,实现DPS控制。它可以最大限度地减少回流功率,减少功率损失。仿真结果验证了理论分析的正确性和所提方案的有效性。
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