三相电压型PWM逆变器的建模研究  

Research for Three Phase Voltage Source PWM Inverter

作　　者：皇金锋[1] 董锋斌[1] 

机构地区：[1]陕西理工学院,电气工程系,陕西汉中723003

出　　处：《电力电子技术》2011年第4期67-69,共3页Power Electronics

基　　金：陕西省教育厅科学研究计划项目资助(09JK374,2010JK468)~~

摘　　要：根据三相电压型PWM逆变器的工作原理,引入开关周期平均算子将离散的系统变换为连续的系统,应用坐标旋转变换将三相交流电量变换成直流量,使用小信号扰动法将非线性的系统变换为线性的系统。建立了三相电压型PWM逆变器系统的小信号动态数学模型,以SPWM调制法为例,建立了从调制器输入到逆变器输出的动态数学模型,仿真和实验结果验证了建模的准确性以及控制策略的合理性。According to three-phase voltage-type PWM inverter principle,the average switching period is introduced to discrete systems operator for the continuous system transformation.Three phase alternating current variable are trans-formed into direct current variable with rotating transition of coordinate.The small signal perturbation method is used to transform the non-linear system into linear,the small signal dynamic mathematical models are built up.To take the SPWM modulation method for example,the input-to-output dynamic transfer function for the system are deduced.Sim-ulation and experimental results verify the accuracy of model and the reasonableness for the control strategy.

关 键 词：逆变器 脉宽调制 开关周期平均算子 建模 

分 类 号：TM464[电气工程—电器]