Decentralized Robust Control of a Network of Inverter-Based Distributed Generation Systems

Document Type

Article

Publication Date

9-1-2023

Abstract

This paper presents the design of decentralized robust controllers for a network of inverter-based distributed generation systems with LC filters in the scale of a nanogrid. Using overlapping decomposition, the network of inverters is clustered into several subnetworks such that all inverters within a subnetwork are strongly coupled and there is no or a weak coupling effect between any two inverters from different subnetworks. For the inverters within the same subnetwork, decentralized robust controllers are designed sequentially in the (Formula presented.) -synthesis framework. In addition, all controllers are designed to be robust against (Formula presented.) variations in the LC filter parameters. To assess the performance of the proposed sequentially-designed controllers and compare it to that of the benchmark independently-designed ones, the distances between two neighboring inverters from the same and different subnetworks are considered to be 200 (m) and 800 (m), respectively. In this case, time-response and robustness analysis results illustrate the superiority of the proposed sequentially-designed controllers in the overlapping decomposition framework over the benchmark independently-designed ones. Moreover, transient overload and nonlinear load analyses demonstrate that the proposed sequentially-designed decentralized controllers are able to keep the load voltage within (Formula presented.) of the nominal value and the harmonic voltage distortions to less than (Formula presented.).

Identifier

85170383066 (Scopus)

Publication Title

Applied Sciences Switzerland

External Full Text Location

https://doi.org/10.3390/app13179517

e-ISSN

20763417

Issue

17

Volume

13

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