三相逆变器小信号输入阻抗特性研究  

Analysis of three-phase inverter small signal input impedance

作　　者：郑先成[1] 王文光[1] 黄沈[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710129

出　　处：《电子设计工程》2015年第1期162-165,169,共5页Electronic Design Engineering

摘　　要：文中基于三相逆变器输入阻抗特性对于分析电力系统的稳定性和控制电能质量的重要意义,通过小信号建模对三相逆变器的输入阻抗进行了分析,得出以下结论:增加负载不利于系统稳定性;控制参数与维持逆变器输入阻抗负阻抗特性有关,带宽越大,负阻抗特性的频段越宽;而LC滤波器参数对输入阻抗的影响主要体现在高频段,随着阻尼比的增加,其输入阻抗幅值增加。本文还提出一种设计逆变器新思路,即从满足系统稳定性要求出发设计逆变器参数,仿真结果表明,整流器与逆变器级联系统是稳定的。Based on the important significance of three-phase inverter input impedance characteristics while analyzing the stability of power system and controlling the power quality. This paper gives the small signal model of three-phase inverter and deduce the impedance expressions of the inverter. The influence on input impedance is analyzed. Then the conclusions are drew： overload is not conducive to the stability of the system; negative impedance characteristics is related to the control parameters, the larger the bandwidth is, the greater the negative impedance characteristics spectrum is;The influence of LC filter parameters on the input impedance of inverters mainly manifests under high frequency conditions. The impedance amplitude increases as the damping ratio enlarges. This paper also puts forward a new idea on inverter design by which the inverter parameters meets all the requirements of system stability. The simulation results show that cascade system comprised of rectifier and inverter is stable.

关 键 词：恒功率负载 PWM逆变器 输入阻抗 系统稳定性 CONSTANT Power Load (CPL) 

分 类 号：TN710[电子电信—电路与系统]