Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 6: 78 - 88

DOI: https://doi.org/10.12141/j.issn.1000-565X.220265

Energy, Power & Electrical Engineering

Current Self-Balanced Bidirectional DC-DC Converter with Low Current Ripple and High Voltage Gain

  • WANG Keying ,
  • HUANG Yi ,
  • WANG Zihao ,
  • YU Tao ,
  • WU Yufeng ,
  • PAN Zhenning
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  • School of Electric Power Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
王克英（1963-），男，博士，教授，主要从事电力系统监测与控制研究。

Received date: 2022-05-10

  Online published: 2022-11-28

Supported by

the the Natural Science Foundation of China-Smart Grid Joint Fund of State Grid Corporation of China(U2066212);the Guangdong Basic and Applied Basic Research Foundation(2023A1515011598)

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Abstract

As a key interface device of the energy storage module in the integrated energy system, the bidirectional DC converter needs the features of low current ripple, high voltage gain and wide range soft switching. To achieve battery-friendly low current ripple ability, bidirectional DC converters use interleaving technology on the low-voltage energy storage side. However, restricted by the actual production process, this type of interleaved bidirectional DC converter has multi-phase current imbalance problems. In this paper, a current self-balancing bidirectional DC converter without complex control algorithm was proposed based on coupled inductors. In the integrated energy storage scenario, the converter not only has the characteristics of current self-balancing, but also has the comprehensive advantages of low current ripple, high voltage gain and wide-range soft switching. First of all, the converter used the clamp capacitor ampere-second balance to forcefully maintain the interleaved current balance in one switching cycle. Hence the low current ripple characteristic of current self-balance was realized at the circuit topology level. Secondly, the coupled inductor is both an energy storage inductor and a transformer. Through the cooperation of the multi-stage gain structure of the circuit, the high voltage gain characteristic was realized. Finally, the converter used a voltage matching control and phase shifting control strategy to decouple the voltage gain and power direction and consequently soft switching characteristics were guaranteed under different working conditions. The article analyzed the working principle and circuit characteristics of the converter, and designed an experimental prototype with an operating voltage of 30 V to 40 V on the low-voltage side, 400 V on the high-voltage side, and a bidirectional power of 1 kW. The experimental prototype simulated the operating characteristics of the low-voltage side lithium battery under different operating voltages, power levels and directions, thus effectively verifying the feasibility of the topology.

Key words： bidirectional DC-DC converter; coupled-inductor; current self-balancing; soft-switching

Cite this article

WANG Keying , HUANG Yi , WANG Zihao , YU Tao , WU Yufeng , PAN Zhenning . Current Self-Balanced Bidirectional DC-DC Converter with Low Current Ripple and High Voltage Gain[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(6) : 78 -88 . DOI: 10.12141/j.issn.1000-565X.220265

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