A NOVEL METHOD FOR DESIGNING THE CONTROLLER OF A LCL-FILTER-BASED GRID-CONNECTED INVERTER WITH CONSIDERING VARYING SYSTEM PARAMETERS

Authors

  • Nguyen Trung Nhan Faculty of Electrical Engineering, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao St, Ward 4, Go Vap Dist, Ho Chi Minh City, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/54/3A/11957

Keywords:

LCL filter, stability criterion, control quality, renewable energy resources.

Abstract

Exactly determining the control coefficients for the controller of a three-phase LCL-filter-based inverter is an important and challenging issue in microgrid systems. However, existing LCL-filter-based inverter systems usually assume that all system parameters are determined accurately and remain constant over time, which is not true in real situations. Variations in the system parameters are known to possibly seriously degrade the performance of LCL-filter-based inverter systems. For efficiency and robustness, this paper proposes a novel method for the generalized controller design of a three-phase LCL-filter-based grid-connected inverter system that can address deviations in system parameters. An optimum way to determine the stability bounds under various system parameters cases is introduced. The assessment of the stability bounds is based on the Routh criterion by solving the characteristic equation of the closed-loop control system. Simulations results are presented to validate the correctness and effectiveness of the proposed design method.

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Published

2018-03-20

Issue

Section

Articles