4.7 Article

Impedance-Based Adaptively Reshaping Method for Enhancing Nonlinear Load Sharing and Voltage Quality in Islanded Microgrids With Virtual Synchronous Generator

Journal

IEEE TRANSACTIONS ON SMART GRID
Volume 13, Issue 4, Pages 2568-2578

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSG.2022.3159726

Keywords

Harmonic analysis; Impedance; Power harmonic filters; Voltage control; Microgrids; Inverters; Synchronous generators; Distributed generation; islanded microgrid; harmonics sharing; harmonic impedance; voltage quality; virtual synchronous generator

Funding

  1. Fundamental Research Funds for the National Natural Science Foundation of China [52077070, TSG-01482-2021]

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In this paper, an impedance-based adaptively reshaping method is proposed to improve the performance of distributed generation units in terms of harmonics sharing and voltage quality. The method enhances nonlinear load sharing and voltage quality by adjusting the harmonic impedance reshaping factor, while avoiding introducing additional virtual harmonic impedance.
For the distributed generation units (DGs) using virtual synchronous generator (VSG) control algorithm connected to the islanded microgrid with high penetration of nonlinear load, there is always a trade-off between harmonics sharing accuracy and voltage quality when using conventional harmonics sharing methods. To address this issue, an impedance-based adaptively reshaping method is proposed in this paper, which is based on harmonic current feedforward compensation control and impedance reshaping factor adaptive control, assigning a variable harmonic impedance reshaping factor for each VSG to improve the controllability of VSG harmonic impedance, thus simultaneously enhancing nonlinear load sharing and voltage quality. Moreover, a droop-based methodology for impedance reshaping factor tuning is presented to adaptively reshape harmonic impedance for each VSG without acquiring the line parameters in advance. The proposed method also enjoys the advantage of avoiding introducing additional virtual harmonic impedance, and thus it is immune from the inverter closed-loop gain throughout the dominant harmonic frequencies. Furthermore, the stability analysis and the key control parameter design are discussed in detail. Finally, the effectiveness of the proposed method is verified by simulation and experimental results.

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