摘要
由于双有源桥双向DC-DC变换器电感电流在一个周期内波动很大,采用传统状态空间平均法对其进行小信号建模不符合"小纹波"假设,本文采用一种常用于谐振变换器建模的广义状态空间平均法(Generalized State-Space Averaging,GSSA)来对双有源桥双向DC-DC变换器进行建模。首先介绍了基于傅里叶变换的广义状态平均法,然后根据变换器的时域状态模型,以原电路变量的傅里叶级数系数为状态变量建立广义状态平均模型,求得控制到输出的传递函数,并设计了闭环控制器。最后在MATLAB/Simulink中搭建了仿真模型,仿真结果表明,利用该模型设计的闭环控制器可使变换器输出稳定电压。
Due to the inductance current of dual-active-bridge bidirectional DC-DC converter fluctuating strongly,the small-signal model with traditional state-space averaging method does not meet the“small ripple”characteristic.This paper presents a generalized state-space averaging(GSSA)modeling method,which is usually used on resonant converters.First,generalized state-space averaging method based on Fourier series is introduced.Second,according to the time domain state model of the converter,using the Fourier series coefficients of the original circuit variables as the state variables,the generalized state-space averaging model is established,the transfer function controlled to output is obtained,and the closed loop controller is designed.Finally,a simulation model is built in Matlab/Simulink,and the simulation result shows that the output voltage of the converter is stable with designed closed loop controller.
作者
刘秀群
王润新
Liu Xiuqun;Wang Runxin(School of Logistics Engineering,Shanghai Maritime University,Shanghai 201306,China)
出处
《船电技术》
2018年第8期56-59,共4页
Marine Electric & Electronic Engineering
关键词
双向DC-DC变换器
广义状态空间平均
小信号建模
dual-active-bridge bidirectional converter
generalized state-space averaging
small-signal modeling