基于平均化理论的PWM变流器电磁暂态快速仿真方法(一)：PWM变流器分段平均模型的建立  

Fast Electromagnetic Transient Simulation Method for PWM Converters Based on Averaging Theory Part One Establishment of Piecewise Averaged Model for PWM Converters

作　　者：许寅[1,2] 陈颖[1,2] 陈来军[1,2] 任正某 

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]电力系统及发电设备控制和仿真国家重点实验室,清华大学,北京市100084 [3]陕西省地方电力(集团)有限公司,陕西省西安市710061

出　　处：《电力系统自动化》2013年第11期58-64,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51277104,51207076);清华大学自主科研计划资助项目(20121087926)~~

摘　　要：为提高分布式发电系统和微电网电磁暂态仿真的效率,基于非线性动态系统的平均化理论,提出了脉宽调制(PWM)变流器的分段平均模型。该模型在开关周期内对PWM变流器的状态方程进行局部平均化,将脉冲形式的开关函数转化为分段常数函数,从而可以采用更大的积分步长进行仿真以提高效率。进一步,文中给出了PWM变流器分段平均模型的误差估计定理及状态变量纹波的近似表达式。最后,通过三相PWM AC-DC变流器算例验证了所述分段平均模型的有效性。To improve computational efficiency of the electromagnetic transient simulations of distributed generation systems and microgrids,a piecewise averaged model of pulse width modulation（PWM） converters based on the averaging theory of nonlinear dynamic systems is proposed.The local averaged state equation for PWM converters in each switching period is derived.It converts the switching functions into piecewise constant functions.Then large integral time step can be chosen to speed up the simulations.Error estimation theorem for the proposed model is provided and the approximate expression of state variable ripple is given as well.The proposed model is verified by simulating a three-phase PWM AC-DC converter.

关 键 词：变流器 平均模型 电磁暂态 快速仿真 分布式电源 

分 类 号：TM46[电气工程—电器] TP391.9[自动化与计算机技术—计算机应用技术]