open access publication

Article, 2024

Power-frequency admittance model of multi-VSGs grid-connected system considering power coupling

International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, 1879-3517, Volume 155, Page 109513, 10.1016/j.ijepes.2023.109513

Contributors

Long, Bo 0000-0003-2953-6362 [1] Yang, Wandi [1] Zhu, Shihan [1] Tianxu, Cao [1] Guerrero, Josep M 0000-0001-5236-4592 [2] Rodriguez, José R 0000-0002-1410-4121 [3] Zang, Xian (Corresponding author) [4]

Affiliations

  1. [1] University of Electronic Science and Technology of China
    2. [NORA names: China; Asia, East];
  2. [2] Aalborg University
    3. [NORA names: AAU Aalborg University; University; Denmark; Europe, EU; Nordic; OECD];
  3. [3] Andrés Bello National University
    4. [NORA names: Chile; America, South; OECD];
  4. [4] Jinling Institute of Technology
    5. [NORA names: China; Asia, East]

Abstract

The high penetration of renewable energy decreases the inertia of power systems. The virtual synchronous generator (VSG) control technology has good inertia compensation effect and has attracted considerable attention because of the similar external characteristics of synchronous generators. However, the power and frequency oscillation of multi-VSG grid-connected systems seriously threatens the stability of power system. Existing multi-VSG power frequency admittance (PFA) models ignore the power coupling caused by the large line impedance ratio in medium- and low-voltage microgrids, and the accuracy of these models needs improvement. Thus, this study aims to establish a multi-VSG grid-connected PFA model considering power coupling. The influence of power coupling on model accuracy is analyzed, and the impacts of line impedance and reactive loop coefficient on the power-frequency response characteristics are investigated. Simulation results verify that the proposed model has higher accuracy over existing models.

Keywords

accuracy, admittance, admittance model, attention, characteristics, characteristics of synchronous generators, coefficient, compensation effect, coupling, effect, energy, external characteristics, external characteristics of synchronous generator, frequency, frequency oscillations, generation, grid-connected system, impact, impact of line impedance, impedance, improvement, inertia, inertia of power systems, influence, line impedance, loop coefficients, low-voltage microgrid, microgrid, model, model accuracy, modeling need improvement, oscillations, penetration, penetration of renewable energy, power, power coupling, power system, renewable energy, response characteristics, results, simulation, simulation results, stability, stability of power system, study, synchronous generator, system, technology, virtual synchronous generator

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