Fundamental Approximation Model and Frequency Characteristics of CPS-PWM with Asymmetric Regular Sampling

Xueyin ZHANG; Yonghai XU; Shaobo XU; Xiangning XIAO

doi:10.7500/AEPS20190328001

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Fundamental Approximation Model and Frequency Characteristics of CPS-PWM with Asymmetric Regular Sampling

Basic Research | 更新时间：2020-07-14

- Fundamental Approximation Model and Frequency Characteristics of CPS-PWM with Asymmetric Regular Sampling
- Automation of Electric Power Systems Issue 6, Pages: 91-97(2020)
- 作者机构：
  
  新能源电力系统国家重点实验室(华北电力大学), 北京市 102206
- 作者简介：
- 基金信息：
- DOI：10.7500/AEPS20190328001
  CLC：
- Received：28 March 2019，
  
  Revised：2019-06-26，
  
  Published Online：04 September 2019，
  
  Published：25 March 2020
- 稿件说明：
移动端阅览
张雪垠,徐永海,徐少博等.不对称规则采样CPS-PWM的基波近似模型及其频率特性[J].电力系统自动化,2020,44(06):91-97.

ZHANG Xueyin,XU Yonghai,XU Shaobo,et al.Fundamental Approximation Model and Frequency Characteristics of CPS-PWM with Asymmetric Regular Sampling[J].Automation of Electric Power Systems,2020,44(06):91-97.
张雪垠,徐永海,徐少博等.不对称规则采样CPS-PWM的基波近似模型及其频率特性[J].电力系统自动化,2020,44(06):91-97. DOI： 10.7500/AEPS20190328001.

ZHANG Xueyin,XU Yonghai,XU Shaobo,et al.Fundamental Approximation Model and Frequency Characteristics of CPS-PWM with Asymmetric Regular Sampling[J].Automation of Electric Power Systems,2020,44(06):91-97. DOI： 10.7500/AEPS20190328001.

摘要

中压多电平换流器常采用模块化结构

可应用于交/直流配电网。配电网电压较低

换流器子模块数较少

因此常采用载波移相脉宽调制(CPS-PWM)提升等效开关频率。建立CPS-PWM模型是换流器系统级建模的基础之一。调制环节非线性

因此常分析其基波。现有CPS-PWM基波近似模型以桥臂等效开关频率为准

在不对称规则采样下模型延时偏低、误差较大。以子模块为基础

通过子模块输出叠加建立了零阶保持器(ZOH)经纯延时近似、不近似以及纯延时环节经Padé近似的3种形式CPS-PWM基波近似模型

更准确地反映了CPS-PWM的频率特性。仿真研究验证了理论分析的正确性。

Abstract

Medium-voltage multilevel converters usually adopt modular structures. They can be used in AC/DC distribution networks. As a result of the relatively low voltage in distribution networks

the number of converter sub-modules is small. Therefore

the carrier phase shift pulse width modulation (CPS-PWM) is usually adopted to increase the equivalent switching frequency. The modeling of CPS-PWM is one of the fundamentals of converter system modeling. The modulation stage is nonlinear

and thus

only the fundamental frequency component is usually considered. The existing fundamental approximation model of CPS-PWM is based on equivalent switching frequency

hence the low time delay and large errors exist when asymmetric regular sampling is adopted. In this work

the following three forms of fundamental approximation models of CPS-PWM are established

i.e. zero order holder (ZOH) delay approximation

ZOH no approximation

and delay Padé approximation. These models are developed by combining the outputs of sub-models on the basis of a sub-module. The proposed models reflect the frequency characteristics of CPS-PWM more accurately than the traditional one. A simulation study verifies the correctness of the theoretical analysis.

关键词

Keywords

references

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