Neutral-Point Balancing Double Phase-Shift PWM Controller for Three-Level DC/DC Converter

doi:10.7652/xjtuxb201304012

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Neutral-Point Balancing Double Phase-Shift PWM Controller for Three-Level DC/DC Converter

更新时间：2025-07-09

- Neutral-Point Balancing Double Phase-Shift PWM Controller for Three-Level DC/DC Converter
- Vol. 47, Issue 4, Pages: 64-72(2013)
- 作者机构：
  
  海军工程大学舰船综合电力技术国防科技重点实验室,武汉,430033
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201304012
  CLC： TM46
- Online First：10 April 2013，
  
  Published：2013
- 稿件说明：
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Neutral-Point Balancing Double Phase-Shift PWM Controller for Three-Level DC/DC Converter[J]. 2013, 47(4): 64-72.
DOI：

Neutral-Point Balancing Double Phase-Shift PWM Controller for Three-Level DC/DC Converter[J]. 2013, 47(4): 64-72. DOI： 10.7652/xjtuxb201304012.

摘要

在分析中频中压大容量三电平H桥直流变换器的电路拓扑和工作原理的基础上

针对中点电位波动问题

提出了一种双移相脉宽调制(PWM)复合控制策略。将原来只有单一移相角的移相PWM变为具有双移相角的移相PWM

从而造成调制不对称来对中点电位进行调节。分析了采用双移相PWM方法能够平衡中点电位能力的边界

设计了三电平H桥直流变换器的双移相PWM复合控制器

并结合传统单移相PWM控制器进行了对比实验研究。结果表明:负载电流流过中点是造成中点电位波动的原因; 双移相PWM能够产生不对称PWM控制脉冲来实现中点电位的调节

且随着负载程度的增加调节能力逐渐增强; 基于双移相PWM的复合控制策略能够较好地实现平衡中点电位控制

且具有较好的动态性能。

Abstract

Circuit topology and working principle of high power middle voltage and frequency three-level H-bridge DC/DC converter are analyzed. Aiming at the neutral-point voltage unbalancing problem

a double phase-shift PWM control method is proposed

which transforms the conventional single angle phase-shift PWM to double angle phase-shift PWM

and the neutral-point voltage can be balanced due to the different phase-shift angle. The boundary of the neutral-point balancing ability is investigated

and a double phase-shift PWM complex controller is designed. Experiments are comparatively conducted between the new controller and conventional single phase-shift PWM controller. It is shown that the neutral-point current is the reason of unbalanced neutral-point; the double phase-shift PWM controller can generate the asymmetry pulses to balance neutral-point

and this ability gets more powerful with heavier loading with better dynamic property.

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references

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