摘要
在直流微电网功率变换系统(PCS)的控制方法中,虚拟直流电机(VDCM)控制具有为系统提供额外惯性和阻尼支撑的优势,但多机并联系统的功率协调分配控制问题尚待深入研究。文中提出一种基于VDCM的多层协同控制策略,能够实现多VDCM总输出功率的高、低频分量解耦和按需分配。首先,详细分析了VDCM控制策略下单机系统的运行特性,将其等效为一个含延迟环节的可控电压源,同时引入电压电流双环控制器改善了传统单电流环VDCM控制性能受制于电枢电阻参数的问题。其次,给出了一种三层级VDCM功率协调分配控制策略,实现了多VDCM总输出功率的高、低频分量解耦和按需分配。最后,给出了多层协同控制框架下各控制层参数的优化设计方法和步骤。基于MATLAB/Simulink仿真平台和dSPACE实验平台的双机并联系统的测试结果表明,所提方法具有较好的功率协调分配性能。
In the control methods for power conversion system(PCS)of DC microgrid,the virtual DC machine(VDCM)control has the advantage of providing additional inertia and damping support for the system,but the power coordination and distribution control problem of multi-machine parallel system needs to be further studied.In this paper,a multi-level cooperative control strategy based on VDCM is proposed,which can decouple the high-and low-frequency components of the total output power of multiple VDCMs and allocate them on demand.Firstly,the operation characteristics of a single-machine system under VDCM control strategy are analyzed in detail,which is equivalent to a controllable voltage source with delay link.At the same time,a voltage-current double-loop controller improves the problem that the traditional single-current-loop VDCM control performance is restricted by armature resistance parameters.Secondly,a three-level coordinated power allocation control strategy for VDCMs is proposed,which realizes the decoupling of high-and low-frequency components of the total output power of multiple VDCMs and the on-demand allocation.Finally,the optimization design method and steps of the parameters of each control layer under the multilayer cooperative control framework are given.The test results of a two-machine parallel system based on MATLAB/Simulink simulation platform and dSPACE experimental platform show that the proposed method has better power coordination and distribution performance.
作者
谢路耀
温会明
张有兵
魏春
陈怡
朱凯
XIE Luyao;WEN Huiming;ZHANG Youbing;WEI Chun;CHEN Yi;ZHU Kai(College of Information Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhijiang College of Zhejiang University of Technology,Shaoxing 312030,China;HRV ELECTRIC,Hangzhou 311121,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2022年第23期134-143,共10页
Automation of Electric Power Systems
基金
浙江省基础公益研究计划资助项目(LGG20E070004)。
关键词
直流电网
微电网
虚拟直流电机
功率变换系统
功率分配
DC power grid
microgrid
virtual DC machine
power conversion system
power distribution
