一种基于零序电压分量注入的单相三电平载波PWM算法

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摘要针对单相三电平二极管中性点钳位变流器(NPC)的中点电位波动控制问题, 首先分析了一种单相单极性载波调制算法(CBPWM)的原理和缺点, 在此基础上, 本文提出了一种基于零序电压分量注入(ZSVI)的单相单极性三电平CBPWM-ZSVI算法, 分析了零序电压分量的取值范围和设计方法, 该CBPWM-ZSVI算法不但能够具备有效的电压平衡能力和良好的动态抗干扰能力, 而且变流器输入端电压的电平跳变幅值为直流侧电压的二分之一。最后, 通过计算机仿真和1kW样机实验对该CBPWM和CBPWM-ZSVI算法的性能进行了对比研究, 仿真和实验结果证明了该CBPWM-ZSVI算法的有效性和可行性。

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	冯晓云
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关键词 ：三电平, 单相, 中点电位控制, 载波脉宽调制, 零序电压分量

Abstract：To suppress the DC-link neutral point voltage fluctuation of single phase neutral-point- clamped(NPC) converters, the principle and shortcoming of a single phase three-level unipolar carrier-based pulse width modulation(CBPWM) algorithm is analyzed firstly. On basis of this, a single-phase three-level unipolar CBPWM with zero-sequence voltage injection (CBPWM-ZSVI) is proposed. Then, the upper and lower limitations of zero-sequence voltage is presented. The adopted CBPWM-ZSVI algorithm can achieve voltage balance ability effectively and dynamic anti-interference ability perfectly, and restrict AC terminal voltage step of the adopted converter within a half of DC-link voltage. Finally, the performance of CBPWM and CBPWM-ZSVI algorithms are compared by computer simulation and 1kW prototype experimental test. Simulation and experimental results verify the effectiveness and feasibility of the proposed CBPWM-ZSVI algorithm.

Key words： Three-level single-phase neutral point voltage control carrier-based pulse width modulation zero-sequence voltage

收稿日期: 2011-09-16 出版日期: 2014-03-25

PACS:

TM921.45

基金资助:国家科技支撑计划资助项目(2009BAG12A05)。

作者简介: 冯晓云女, 1962年生, 教授, 博士生导师, 国家教学名师, 研究方向为电力牵引交流传动及其控制技术、列车运行控制与牵引计算。宋文胜男, 1985年生, 博士, 主要研究方向为电力牵引交流传动及其控制技术。

引用本文:

冯晓云, 宋文胜. 一种基于零序电压分量注入的单相三电平载波PWM算法[J]. 电工技术学报, 2013, 28(4): 140-148. Feng Xiaoyun, Song Wensheng. A Single Phase Three-Level Carrier-based PWM Scheme with Zero-sequence Voltage Injection. Transactions of China Electrotechnical Society, 2013, 28(4): 140-148.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I4/140

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