级联式电力电子变压器混合脉宽调制谐波分析及均衡控制

LIU Jiaomin

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级联式电力电子变压器混合脉宽调制谐波分析及均衡控制

更新时间：2025-08-13

- 级联式电力电子变压器混合脉宽调制谐波分析及均衡控制
- Automation of Electric Power Systems Vol. 41, Issue 7, Pages: 101-107(2017)
- 作者机构：
  
  新能源电力系统国家重点实验室(华北电力大学),河北省,保定市,071003
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2017
- 稿件说明：
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LIU Jiaomin. [J]. Automation of electric power systems, 2017, 41(7): 101-107.
DOI：

LIU Jiaomin. [J]. Automation of electric power systems, 2017, 41(7): 101-107. DOI：

摘要

针对基于级联H桥及隔离双向DC/DC变换器的电力电子变压器，提出一种混合工频和高频调制的混合脉宽调制(HPWM)策略。基于波形合成原理及双重傅里叶积分方法，对5电平级联H桥HPWM输出电压频谱表达式进行了理论推导，并与载波移相调制时输出电压谐波特性进行对比。结果表明HPWM输出电压波形仅含有基波与载波边带谐波，在不增加谐波总畸变率的同时可降低系统开关频率。为解决HPWM时各模块开关模式不对称造成的中间直流电压不均衡问题，提出一种前级级联H桥采用开关函数轮换控制与后级隔离双向DC/DC变换器电压反馈加前馈控制相结合的子模块均衡控制策略，有效确保子模块功率及电容电压处于相同的动态变化范围。仿真和实验结果验证了HPWM谐波分析的正确性及所提控制策略的有效性。

Abstract

A hybrid pulse width modulation(HPWM)strategy using both low and high frequency switching methods is presented for cascaded H-bridge(CHB)and isolated bidirectional DC/DC converter(IBDC)based power electronic transformer. Based on the waveform-synthesis theory and double Fourier integral method

an analytical spectral expression of the HPWM output voltage for 5-level CHB is derived

and a comparison of the output harmonic characteristics between carrier phase-shift(CPS)and HPWM is also provided. The results show that the HPWM voltage contains only fundamental wave and carrier sideband harmonics which means lower switching frequency could be obtained without compromising the total harmonic distortion(THD). To deal with the unbalance of DC voltages under asymmetrical HPWM

a balancing control strategy is implemented

which utilizes a switching function rotation method for the CHB and a voltage feedback-feedforward controller for the IBDC. The proposed method can effectively ensure that each module will work at the same power and DC voltage level. The harmonic analytical method and the proposed control strategy are validated by simulation and experimental results.

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