DC Voltage Balance Control Strategy for Load Unbalanced Power Electronic Transformer

SONG Pinggang; YANG Shengdi; ZHENG Yazhi; ZHOU Penghui; JIANG Zhiqiang

doi:10.13296/j.1001-1609.hva.2019.09.007

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DC Voltage Balance Control Strategy for Load Unbalanced Power Electronic Transformer

更新时间：2025-04-26

- DC Voltage Balance Control Strategy for Load Unbalanced Power Electronic Transformer
- High VoltageApparatus Vol. 55, Issue 9, Pages: 50-56(2019)
- 作者机构：
  
  华东交通大学电气与自动化工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.09.007
  CLC： TM41
- Published：2019
- 稿件说明：
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[1]宋平岗,杨声弟,郑雅芝,周鹏辉,江志强.负载不平衡电力电子变压器直流电压平衡控制策略[J].高压电器,2019,55(09):50-56.

SONG Pinggang, YANG Shengdi, ZHENG Yazhi, et al. DC Voltage Balance Control Strategy for Load Unbalanced Power Electronic Transformer[J]. High voltageapparatus, 2019, 55(9): 50-56.
[1]宋平岗,杨声弟,郑雅芝,周鹏辉,江志强.负载不平衡电力电子变压器直流电压平衡控制策略[J].高压电器,2019,55(09):50-56. DOI： 10.13296/j.1001-1609.hva.2019.09.007.

SONG Pinggang, YANG Shengdi, ZHENG Yazhi, et al. DC Voltage Balance Control Strategy for Load Unbalanced Power Electronic Transformer[J]. High voltageapparatus, 2019, 55(9): 50-56. DOI： 10.13296/j.1001-1609.hva.2019.09.007.

摘要

电力电子变压器网侧级联H桥整流器需采用中大功率高压直流电容器来维持直流电压稳定

因此如何稳定直流侧电容电压以及降低电容容值尤为重要。文中首先建立级联H桥整流器平均数学模型

依据瞬时功率平衡推导出直流侧电容谐波数学模型并进一步分析对电路产生影响。提出一种基于陷波器滤波算法用于动态检测并抑制直流电容电压倍频干扰

在不增加直流电容器情况下实现降低直流电容和抑制直流电压振荡

同时采用载波移相调制算法引入脉冲补偿机制实现电压平衡控制。最后通过MATLAB/Simulink仿真平台验证

结果表明

所提控制策略有效地抑制谐波稳定直流电容电压输出平衡。

Abstract

The power electronic transformer network side cascade H-bridge rectifier needs to use medium-high power high-voltage DC capacitor to maintain the DC voltage stability

so how to stabilize the DC-side capacitor voltage and reduce the capacitance value is especially important.In this paper

the accurate average mathematical model of the cascaded H-bridge rectifier is first established.The mathematical model of the DC-side capacitance is derived based on the instantaneous power theory and further analyzed to affect the circuit.A notch filter algorithm is proposed to dynamically detect and suppress DC capacitor voltage double frequency interference

without adding DC capacitor

DC capacitor can be reduced and DC voltage oscillation can be suppressed.Meanwhile

the carrier phase shift modulation algorithm is introduced into the pulse compensation mechanism to realize voltage balance control.Finally

the MATLAB/Simulink simulation platform is verified.The results show that the proposed control strategy effectively suppresses the harmonic stable DC capacitor voltage output balance.

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