模块化直流电源方案与控制系统设计Scheme and Control System Design of Modular DC Power Supply
刘楚晖,楼伯良
LIU Chuhui,LOU Boliang
摘要(Abstract)：
为实现直流电源功率快速拓展,提出了基于模块化思路的直流电源方案。单模块由基于单电感滤波PWM(脉冲宽度调制)整流器的前级子模块和基于移相全桥的后级子模块串接而成,多模块在交流输入侧与直流输出侧直接并联来实现功率提升。在考虑数字控制系统延时的情况下,建立多模块并联时前级子模块电流环及输入阻抗模型,分析多种因素对前级子模块稳定性的影响。同时,建立后级子模块的输出阻抗模型,从而为确立此直流电源可带负载阻抗的范围提供理论依据。最终研制出六模块并联、总输出220 V/600 A的样机,验证了模块化直流电源方案和控制系统的可行性。
A DC power supply scheme based on modularization is proposed to realize the rapid expansion of DC power. The single module is composed of the front submodule based on a single-inductance filtered PWM(pulse width modulation) rectifier and the back submodule based on the phase-shifting full-bridge converter.Multiple modules are directly connected in parallel at the AC input interface and the DC output interface so for power increase. On account of the delay of the digital control system, a control model of the current loop and input impedance model of paralleled front submodules is established to analyze various influencing factors of submodule stability. In the meantime, output impedance model of the back submodule is built to provide a theoretical basis for determining the range of impedance load carried by DC power. Finally, a prototype of 220 V/600 A with six modules in parallel is developed to verify the feasibility of scheme modular DC power supply.
关键词(KeyWords)：
模块化直流电源;数字控制系统延时;输入阻抗;输出阻抗;稳定性
modular DC power supply;delay of the digital control system;input impedance;output impedance;stability
基金项目(Foundation): 国网浙江省电力有限公司科技项目(5211DS170011)
作者(Author):
刘楚晖,楼伯良
LIU Chuhui,LOU Boliang
DOI: 10.19585/j.zjdl.202007005
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