级联H桥变换器PWM线性调制区共模注入扩增  

PWM with Common Mode Injection to Increase Linear Modulation Region for Cascaded H-bridge Inverter

作　　者：李钦召 赵学民[2] LI Qinzhao;ZHAO Xuemin(Department of Electronic Engineering,Zhengzhou Professional Technical Institute of Electronics&Information,Zhengzhou 451450,Henan,China;School of Intelligent Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450015,Henan,China)

机构地区：[1]郑州电子信息职业技术学院电子工程系,河南郑州451450 [2]郑州航空工业管理学院智能工程学院,河南郑州450015

出　　处：《电气传动》2022年第16期37-42,共6页Electric Drive

基　　金：河南省重点研发与推广专项(17210221052)。

摘　　要：微电网孤岛运行时,作为接口设备的级联H桥变换器在实现诸如负序补偿等辅助功能时,可能需配置非正弦的脉宽调制(PWM)波。为避免过调制,PWM调制波中正序分量将减小,从而降低变换器最大正序输出电压。对此,提出了一种新颖的共模分量注入技术,以最大化扩增PWM线性调制区。新方案无需在控制器中设置查找表即可实时实施,即独立于控制器,并与任意基于载波的PWM兼容。同时,新技术可用于对称型或非对称型级联H桥,并配合容错PWM一起使用时,可实现变换器的故障容错运行。利用级联H桥变换器样机进行了共模注入PWM测试,实验结果验证了新型PMW线性调制区扩增共模注入技术的效果。When the microgrid is operating in island mode,the cascaded H-bridge(CHB)converter as an interface device may need to be configured with a non-sinusoidal reference wave of pulse width modulation(PWM)when implementing auxiliary functions such as negative sequence compensation.In order to avoid overmodulation,the positive sequence component in the PWM reference wave will be reduced,thereby reducing the maximum positive sequence of the converter output voltage.In this regard,a novel commonmode component injection technique was proposed to maximize the PWM linear modulation region.The new scheme can be implemented in real time without setting up a look-up table in the controller,that is,independent of the controller and compatible with any carrier-based PWM.At the same time,the new technology can be used for symmetrical or asymmetrical cascaded H-bridges,and when used with fault-tolerant PWM,it can realize fault-tolerant operation of the converter.The common mode injection PWMtests were carried out using the CHB converter prototype.The experimental results verify the effect of the new PMWlinearmodulation area amplification commonmode voltage injection technology.

关 键 词：微电网 级联H桥变换器 脉宽调制 共模注入 线性调制区 

分 类 号：TM46[电气工程—电器]