NDLI: Oscillation instability of a DC microgrid caused by aggregation of same CPLs in parallel connection

Content Provider	IET Digital Library
Author	Du, Wenjuan Zheng, Kaiyuan Wang, Hai Feng
Abstract	The authors found that aggregation of same constant power loads (CPLs) in the parallel connection may possibly cause oscillation instability of a DC microgrid. In this study, they carry out analysis to reveal the mechanism about why the danger of oscillation instability may be brought about by the aggregation of CPLs in parallel connection. By assuming that the dynamic models of N CPLs in parallel connection are identical, analysis in this study proves that aggregated representation of the CPLs is equivalently comprised of N dynamically independent subsystems. Oscillation modes of aggregated CPLs may possibly move toward the right on the complex plane when the number of CPLs, N , increases. They propose a method to estimate the direction of movement of oscillation modes when N varies without having to conduct the modal solution of full-order state matrix. Thus, the proposed method can detect the danger of oscillation instability caused by aggregation of CPLs in parallel connection and estimate the maximum number of CPLs when the oscillation instability may occur. They present two examples DC microgrids with aggregated CPLs in parallel connection to evaluate the analytical conclusions. Application of the proposed method in planning the grid connection of CPLs is demonstrated.
Starting Page	2637
Ending Page	2645
Page Count	9
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 13, Jul (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.6940
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-05-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Aggregated CPLs Aggregated Representation Constant Power Loads CPL Aggregation DC Microgrid Distributed Power Generation Dynamically Independent Subsystems Examples DC Microgrid Full-order State Matrix Grid Connection Planning Oscillation Instability Oscillation Mode Parallel Connection Power System Control Power System Stability
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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