Remote Synchronization of the Microgrid to the Utility Grid Without Access to Point of Common Coupling in the Presence of Disturbances

Mateusz Litwin,Dariusz Zielinski,Sebastian Stynski

doi:10.1109/access.2022.3157310

Mateusz Litwin, Dariusz Zielinski + Show 1 more

Open Access

https://doi.org/10.1109/access.2022.3157310

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Abstract

The article presents the method of remote micro-grid synchronization with the utility grid in the presence of voltage disturbances. The proposed algorithm and control devices synchronize different power systems on the basis of the instantaneous voltage phase angle in spite of voltage quality problems and without need of access to point of common coupling. In the presence of grid voltage disturbances, instantaneous grid voltage phase angle is estimated and transmitted remotely with a certain accuracy, which is varies in presence of disturbances of grid voltages or depends on the synchronization algorithm and data transmission rate. The paper focuses on the influence of voltage disturbances on the proposed remote synchronization strategy and the shape of the output current of the synchronized power converter on the micro-grid. The four types of grid voltage disturbances are presented: harmonics, one-phase sag, two-phase sag, and phase voltage jump. The final conclusions present the possibility of using the proposed remote synchronizations algorithm in micro-grid power converter applications in the presence of typical utility grid voltage disturbances.

Highlights

The concept of a micro-grid (MG) was introduced as a result of the increased demand for environment-friendly renewable sources and the need for energy generation in reliable and secure-based ways [1]
The main aim of this paper is to investigate the advanced synchronization algorithm such as SOGI-phase-locked loop (PLL), which will operate with the proposed remote synchronization strategy without accessible point of common coupling (PCC)
This paper presents the extension of the previously developed by authors remote synchronization strategy presented on [31]

Summary

Introduction

The concept of a micro-grid (MG) was introduced as a result of the increased demand for environment-friendly renewable sources and the need for energy generation in reliable and secure-based ways [1]. The first association responsible for this task was the consortium for electric reliability technology solutions [2] Such MG is a small-scale power system or part of a utility grid (UG) that is made up of distributed generators such as wind turbines, fuel cells, photovoltaic panels, etc. It can include flexible loads and energy storages that operate within clearly defined control strategies. As delays are crucial for the performance of the remote synchronization method, User Datagram Protocol is used The use of such protocol has the disadvantage of possible packet loss and reorder if Ethernet transmission disturbances occur. The reordering problem is resolved by discarding older packets, while packet loss causes slower performance of the solution fig

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