电力电子非线性负载数字化实现方法  

Digital realization method of power electronic nonlinear load

作　　者：宋鹏先[1,2] 李耀华[1] 王平[1] 苏朝阳[1] 王松[1] 

机构地区：[1]中国科学院电工研究所中国科学院电力电子与电气驱动重点实验室,北京100190 [2]国网天津市电力公司电力科学研究院,天津300384

出　　处：《电机与控制学报》2016年第5期7-13,共7页Electric Machines and Control

基　　金：国家863计划(2014AA052602)

摘　　要：针对电力电子负载模拟非线性负载算法中存在的计算繁琐、准确度不高的问题,提出一种数字化实现方法。该方法是依据三相不控整流桥输入电压瞬时值与直流侧电压的数学关系以及二极管的导通条件,获得其七个工作阶段的判定条件,再利用后向差分法数字求解不同工作阶段的电路微分方程。得到三相不控整流桥的输入电流,作为负载模拟变换器电流环的控制指令信号,并在αβ坐标系下采用比例谐振控制器跟踪交流参考电流。仿真及实验结果表明了所提出的方法具有计算简洁,准确度高,响应迅速等特点。Aiming at the problem that the nonlinear load simulation algorithm of power electronic load is complex and low accuracy,a novel digital implementation method was presented.According to the rela-tions between the input voltage instantaneous value of three-phase uncontrolled rectifier bridge and DC voltage,as well as diode conduction conditions,the decision conditions of seven working stages were got. The differential equation of different working stages was solved using backward difference method to get the input current of three-phase uncontrolled rectifier bridge.The results were as the command signals of the current loop control of simulation converter inαβcoordinate and resonant controller was used to track the reference current in the static coordinate.Simulation and experimental results show that the proposed method simulates three-phase uncontrolled rectifier bridge with the characteristics of simple calculation, fast response and high accuracy.

关 键 词：电力电子负载 负载模拟算法 三相不控整流桥 比例谐振控制器 静止坐标系 

分 类 号：TM46[电气工程—电器]