单相H桥逆变器中的抗共模电压测量系统  

Measurement System Inhibiting Common-mode Voltage of the Single Phase H-bridge Inverter

作　　者：李维波[1] 赵治华[1] 王东[1] 张明元[1] 许金[1] 李卫超[1] 

机构地区：[1]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

出　　处：《高电压技术》2009年第10期2509-2514,共6页High Voltage Engineering

基　　金：国家自然科学基金委员会创新研究群体科学基金(50721063);中国博士后科学基金(20080431382)~~

摘　　要：采用脉宽调制和矢量控制的单相H桥逆变器会产生共模电压,后者会对逆变器、电机及其相关设备产生危害。为有效抑制共模电压对电机参数测量系统的不良影响,提出了一种抗共模能力较强的测试系统,其关键组件包括新型分压器、霍耳电流传感器和Nicolet数据采集系统。它能够快速、实时获得单相H桥逆变器输出的电压和电流,借助于傅立叶变换,提取基波电压和基波电流及其相位,迅速得到电机参数。新型分压器采用了两端用大电阻中间串接小电阻的对称结构,它能够最大限度地抑制逆变器共模电压对测量结果的不良影响。理论分析与试验结果表明了这种方法对抑制共模影响的可行性和有效性。The single phase H-bridge inverter can generate common-mode voltage due to the sine pulse width modulation （SPWM） and vector controller. This voltage is harmful to the inverter, motor and the relative test instrumentation. Consequently, a novel measurement system is provided for the acquisition of the voltage and current output from the H-bridge inverter. The three main components of the test system are the voltage divider, the Hall current transducer, and the Nicolet data acquisition system. The test apparatus has a fast speed of analysis of the voltage and current data collected in real time. The fundamental current and voltage and their phase-angle difference are gained accordingly by means of the Fourier transformation. The voltage divider is symmetrically structured by three resistors （i. e. , a high resistance, a lower resistance and a high resistance are in series）. Both theory analysis and experimental results can verify the truth of the proposed test method/system.

关 键 词：共模电压 单相H桥逆变器 分压器 测试系统 电流传感器 数据采集系统 

分 类 号：TM464[电气工程—电器]