含新型虚拟电机的直流微网动态稳定性分析与自适应电压惯性控制  

Dynamic Stability Analysis and Self-adaptive Voltage Inertia Control of DC Microgrids with Novel Virtual Machine

作　　者：张祥宇[1] 李浩[1] 付媛[1] ZHANG Xiangyu;LI Hao;FU Yuan(State Key Laboratory of New Energy Power System,Department of Electric Power Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电力工程系新能源电力系统国家重点实验室,保定071003

出　　处：《高电压技术》2021年第8期2865-2873,共9页High Voltage Engineering

基　　金：国家自然科学基金(51607070);中央高校基本科研业务费专项资金(2018MS90)。

摘　　要：为了提升虚拟直流电机的电压惯量与阻尼支持能力,并进一步简化附加控制器结构,显著改善直流微网的动态稳定性,提出了一种新型的虚拟直流电机控制(virtual DC machine control,VDMC)。首先,将双向DC/DC换流器与直流电机进行类比,通过模拟直流电机的功率调节特性,得到适用于双向DC/DC换流器的VDMC模型。其次,通过对所提出VDMC进行改进,得到了更为简化的控制结构,并且具备更加优越的电压动态性能和惯性支撑能力。在此基础上,对改进后的虚拟电机设计自适应电压惯量调节控制技术,使其能够动态响应电压变化,进一步提高系统的动态稳定性。最后,根据阻抗比判据,理论分析所提VDMC对系统的稳定性支持作用,并通过时域仿真算例,验证所提控制策略的有效性。In order to improve the voltage inertia and damping support ability of virtual DC machine,to further simplify the structure of additional controller,and to significantly improve the dynamic stability of DC microgrid,a new type of virtual DC machine control(VDMC)is proposed in this paper.Firstly,the bidirectional DC/DC converter is compared with DC machine,and the VDMC model suitable for bidirectional DC/DC converter is obtained by simulating the power regulation characteristics of DC machine.Secondly,by improving the proposed VDMC,a more simplified control structure is obtained,and it has better voltage dynamic performance and inertia support ability.On this basis,an adaptive voltage inertia regulation control is designed for the improved VDMC,which can dynamically respond to the voltage change and further improve the dynamic stability of the system.Finally,according to the criterion of impedance ratio,the supporting effect of the proposed VDMC on the stability of the system is theoretically analyzed,and the effectiveness of the proposed control strategy is verified by a time-domain simulation example.

关 键 词：直流微网 DC/DC换流器 虚拟直流电机控制 小信号分析 动态稳定性 自适应电压惯量调节控制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM33