基于前馈复合控制策略的低频纹波抑制  

Low Frequency Ripple Suppression Based on Feedforward Composite Control Strategy

作　　者：周浩[1] 廖冬初[1] 蔡华锋[1] 范文超 张鑫 ZHOU Hao;LIAO Dongchu;CAI Huafeng;FAN Wenchao;ZHANG Xin(Hubei University of Technology,Wuhan 430070,China)

机构地区：[1]湖北工业大学,湖北武汉430070

出　　处：《通信电源技术》2020年第18期1-4,9,共5页Telecom Power Technology

摘　　要：为了同时抑制两级式能馈型直流电子负载中前级DC/DC输入电流和输出电流的低频纹波,解决传统PID控制不足的问题,提出了一种电流前馈复合控制策略。根据DC/DC的无源性,建立变换器的欧拉-拉格朗日数学模型得到无源控制规律。通过注入阻尼改善控制器动态性能,实现输入电流的快速跟踪和低频纹波抑制。在考虑移相全桥副边占空比丢失和母线电感电流导致占空比中包含低频纹波后,基于无源控制基础引入母线电感电流前馈,得到新的无源控制规律,并代入平均状态方程中发现调节规律。通过Simulink仿真平台的理论分析,证明了该策略能够有效抑制前级DC/DC输入电流和输出电流中的低频纹波,且具有较好的静动态特性。In order to simultaneously suppress the low-frequency ripple of the front-stage DC/DC input current and output current in the two-stage energy-feeding DC electronic load,and to solve the problems of traditional PID control,a current feed forward composite control strategy is proposed.According to the strict passiveness of DC/DC,the Euler-Lagrange mathematical model of the converter is established,so as to obtain the passive control law.The dynamic performance of the controller is improved by injecting damping,and the input current is quickly tracked and the low frequency ripple is suppressed.After considering the loss of the duty cycle of the secondary side of the phaseshifted full bridge and the low frequency ripple caused by the bus inductor current,the bus inductor current feedback is introduced based on passive control to obtain a new passive control law and substitute the average state The regulation law is found in the equation.The theoretical analysis is verified through the Simulink simulation platform.This strategy effectively suppresses the low-frequency ripple in the input current and output current of the previous DC/DC,and has good static and dynamic characteristics.

关 键 词：直流电子负载 移相全桥 低频纹波 无源控制 复合控制 

分 类 号：TM4[电气工程—电器]