电力系统自动化2025，Vol.49Issue(23)：77-88,12.DOI:10.7500/AEPS20250227002
基于等效模型的多机直流微电网惯性时间常数估算方法
Equivalent Model Based Estimation Method for Inertia Time Constants of Multi-generator DC Microgrid
摘要
Abstract
For multi-generator DC microgrids with differentiated virtual inertia control strategies,the interaction between multiple DC virtual synchronous generators(VSGs)makes it difficult to accurately estimate the system virtual inertia.Therefore,this paper proposes an equivalent modeling method considering the inertia interaction and establishes the equivalent inertia models for multi-generator DC microgrids with two typical virtual inertia control strategies.Based on this model,this paper derives the time-domain response analytical expression of DC voltage and the estimation formula for the inertia time constant.It also reveals the physical essence of inertia equivalence through an equivalent RC circuit model.Moreover,a method for constructing an inertial time constant mapping surface is proposed based on inertia equivalence.A three-dimensional inertia time constant mapping surface is constructed.A quantitative analysis is conducted on the effects of factors such as cut-off frequency,virtual inertia coefficient,load power,and droop coefficient on the virtual inertia of a multi-generator DC microgrid.Finally,a multi-generator DC microgrid and equivalent inertia model are constructed based on the RT-Box hardware-in-the-loop platform.Multiple sets of comparison results show that the relative error between the theoretical estimation and the actual measurement results is less than 3％,verifying the effectiveness of the proposed method.关键词
直流微电网/等效模型/虚拟惯性/时域响应解析式/时间常数/虚拟同步机Key words
DC microgrid/equivalent model/virtual inertia/time-domain response analytical expression/time constant/virtual synchronous generator(VSG)引用本文复制引用
赵学深,彭克,郭力,段家成,吴双辰,杨云虹..基于等效模型的多机直流微电网惯性时间常数估算方法[J].电力系统自动化,2025,49(23):77-88,12.基金项目
国家自然科学基金青年基金资助项目(52407121) （52407121）
山东省自然科学基金资助项目(ZR2024QE219). This work is supported by National Natural Science Foundation of China(No.52407121)and Shandong Provincial Natural Science Foundation of China(No.ZR2024QE219). （ZR2024QE219）
