基于无功优化的三端口双向DC-DC变换器控制策略

doi:10.19595/j.cnki.1000-6753.tces.210451

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摘要针对三端口双向DC-DC变换器（TP BDC）在端口电压不匹配时无功回流大、软开关范围小以及效率低的问题,该文提出一种以最小无功为目标的效率优化控制策略。分析TP BDC各端口的电压电流特性,基于占空比控制和相量分析法建立各端口功率模型。通过构建最小无功优化问题并求解最优控制量,在宽电压范围内减小TP BDC的无功回流。进一步分析TP BDC在优化控制下的软开关特性,提出最优控制量的选取策略。实验结果表明,该文所提优化控制策略使TP BDC在宽电压工况下具有更小的无功回流和更宽的软开关范围,从而显著提升变换器在端口电压不匹配及轻载条件下的传输效率。

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关键词 ：三端口双向DC-DC变换器, 最小无功, 优化控制策略, 相量分析法

Abstract：The three-port bidirectional DC-DC converter (TP BDC) suffers high reactive power, narrow soft switching range, and low efficiency when the port voltages do not match. Thus, this paper proposes a control strategy for the efficiency optimization of TP BDC, which aims to minimize the reactive power. The voltage and current characteristics of each port are analyzed. On this basis, the power model of each port is established with the duty cycle control and phasor analysis. By constructing and solving the minimum reactive power optimization problem, the reactive power of TP BDC is reduced in a wide voltage range. Furthermore, this paper analyzes the soft switching characteristics of TP BDC under the optimal control. The selection strategy of optimal control parameters is subsequently proposed. The experimental results show that TP BDC has lower reactive power and wider soft switching range under wide voltage conditions by applying the proposed optimal control strategy. Consequently, the transmission efficiency of the converter is significantly improved under port voltage mismatch and light load conditions.

Key words： Three-port bidirectional DC-DC converter (TP BDC) minimum reactive power optimal control strategy phasor analysis method

收稿日期: 2021-04-02

PACS:

TM46

基金资助:智能电网保护和运行控制国家重点实验室开放课题项目（SGNR0000KJJS1907542）和河北省高等学校科学技术研究项目（QN2019041）资助

通讯作者: 黄珺男,1986年生,博士,工程师,研究方向为高频功率变换技术。E-mail: hj2018@hebut.edu.cn

作者简介: 付亚楠女,1998年生,硕士研究生,研究方向为三端口双向DC-DC变换器。E-mail: nanhebei@126.com

引用本文:

黄珺, 付亚楠, 吕晓飞, 何许国, 霍鹏冲. 基于无功优化的三端口双向DC-DC变换器控制策略[J]. 电工技术学报, 2022, 37(8): 2086-2096. Huang Jun, Fu Yanan, Lü Xiaofei, He Xuguo, Huo Pengchong. Control Strategy of Three-Port Bidirectional DC-DC Converter Based on Reactive Power Optimization. Transactions of China Electrotechnical Society, 2022, 37(8): 2086-2096.

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