Improving the Performance of a VSG in the Distorted Grid Using Third-Order Generalized Integrator

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Arjmandzadeh Ramin; Banejad Mahdi; Akbarzadeh Kalat Ali

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Journal Paper

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Journal: Journal of Applied Research in Electrical Engineering Year:2024 | Volume:3 | Issue:1 Page(s): 1-8

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Title

Improving the Performance of a VSG in the Distorted Grid Using Third-Order Generalized Integrator

Author(s)

Arjmandzadeh Ramin | Banejad Mahdi | Akbarzadeh Kalat Ali | Issue Writer Certificate

Keywords

Virtual synchronous generator

Grid stability

Distributed resources

DC deviation

Additional harmonics

Abstract

In conventional power systems, most of the power is produced by synchronous generators in the electric grid that have heavy and rotating rotors. As a result, there is an inherent inertia in the rotor of these generators. The presence of inertia in the grid prevents sudden frequency changes during imbalance situations, thus, the frequency stability of the grid is maintained. Today, with the increase of renewable energy sources that are usually connected to the network by power electronic equipment. Such resources do not have rotating materials, therefore, the overall inertia of the grid decreases and the stability of the system deteriorates. To solve the problem of lack of inertia in the power electronic-based grid, the notion of the Virtual synchronous generator (VSG) technology has been introduced in recent years. This technology can imitate the behavior of traditional synchronous generators for inverters connected to the grid. In this way, the inverters connected to the grid act like a synchronous generator during imbalance. One of the problems associated with the converters-based microgrid is the existence of DC deviations and Additional harmonics, which disrupt the work of the converters. Therefore, in this article, a third-order generalized integrator (TOGI) -based VSG for grid-connected inverters is employed so that the system stability is maintained in the conditions of Additional harmonics and DC deviation. To show the effectiveness of the proposed method, time domain simulations have been performed in Simulink/MATLAB software. The results of the simulation verify the performance of the proposed method.

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