Comparison Between Two Strategies for Suppressing DC Bias in Three-Phase Inverter Without Output Transforms

doi:10.7652/xjtuxb201406011

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Comparison Between Two Strategies for Suppressing DC Bias in Three-Phase Inverter Without Output Transforms

更新时间：2025-07-09

- Comparison Between Two Strategies for Suppressing DC Bias in Three-Phase Inverter Without Output Transforms
- Vol. 48, Issue 6, Pages: 60-64(2014)
- 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/xjtuxb201406011
  CLC： TM46
- Online First：10 June 2014，
  
  Published：2014
- 稿件说明：
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Comparison Between Two Strategies for Suppressing DC Bias in Three-Phase Inverter Without Output Transforms[J]. 2014, 48(6): 60-64.
DOI：

Comparison Between Two Strategies for Suppressing DC Bias in Three-Phase Inverter Without Output Transforms[J]. 2014, 48(6): 60-64. DOI： 10.7652/xjtuxb201406011.

摘要

为了抑制无输出隔离变压器中由于控制漂移、器件性能不一致等原因使得三相逆变器输出中包含的直流分量

提出了两种直流分量的抑制策略并进行了对比分析。第一种是在dq坐标系下采用带通滤波器检测输出电流直流分量并进行PI调节

然后补偿SVPWM脉宽的策略; 第二种是在abc坐标系下采用滑动平均滤波检测出输出电流的直流分量并进行PI调节

然后补偿SVPWM脉宽的策略。通过理论分析和建模仿真对两种策略进行了对比分析

并在450 kW的三相逆变器上做了一系列实验。结果表明

采用滑动平均滤波策略在不同负载下对输出直流分量的抑制都有更好的效果

而带通滤波策略在轻载下抑制效果不能达标

重载下抑制效果也没有滑动平均法好。

Abstract

To suppress the output DC component of three-phase inverter without output transformers due to control drift and inconsistent device performances

two modulation strategies are comparatively proposed. In the first modulation strategy

band-pass filter is adopted to detect the DC component in total output current

then the SVPWM pulse width is compensated with PI control in dq coordinate system. In the second strategy

slip average filter is chosen to detect the DC component

then SVPWM pulse width is compensated with PI control in abc coordinate system. Following the discussions for modeling and simulating

the experiments for 450 kW three-phase inverter are conducted and the results indicate that the slip average filter better suppresses the output DC component

while band-pass filter does not meet the suppressing standards under light load and works worse than the former under heavy load.

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references

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