电力系统保护与控制2024，Vol.52Issue(22)：93-103,11.DOI:10.19783/j.cnki.pspc.240009
一种混合型双向直流变压器的改进虚拟直流电机控制
Improved virtual DC motor control for a hybrid bi-directional DC transformer
摘要
Abstract
To realize high efficiency transmission and flexible voltage regulation of series-parallel DC solid state transformers in medium and low voltage DC interconnection scenarios,this paper combines the CLLLC and the Buck/Boost-CLLLC converter modules to form a new hybrid series-parallel bi-directional DC solid state transformer(HSBDCSST).It has both the bi-directional flexible voltage regulation of Buck/Boost-CLLLC converter and the bidirectional high-efficiency transmission advantage of the CLLLC converter.Synchronized square wave control of the CLLLC module and the improved virtual DC motor control(IVDCM)of the Buck/Boost-CLLLC module are also proposed,in which each CLLLC module is controlled by the same fixed frequency square wave with 50%duty cycle to ensure high efficiency.As for the Buck/Boost-CLLLC module,a link that the rated angular speed of the DC motor varies in proportion to the mechanical power is introduced on the basis of traditional VDCM control.This constitutes the IVDCM control strategy,realizes voltage regulation and improves the inertia damping characteristics of the DC transformer.This effectively improves the response speed and dynamic characteristics of the system.Finally,a Matlab/Simulink simulation model and an experimental platform of the 3-module series-parallel system are constructed to verify the effectiveness of the control method.关键词
混合型直流变压器/CLLLC变换器/改进虚拟直流电机控制/Buck/Boost电路调压/动态特性Key words
hybrid DC transformer/CLLLC converter/improved virtual DC motor control/Buck/Boost circuit voltage regulation/dynamic properties引用本文复制引用
王允建,张昌杰,孙星,杨森,何世豪,郭向伟..一种混合型双向直流变压器的改进虚拟直流电机控制[J].电力系统保护与控制,2024,52(22):93-103,11.基金项目
This work is supported by the Scientific and Technological Project of Henan Province(No.232102240078). 河南省科技攻关项目资助(232102240078) （No.232102240078）
