Optimal Operation of Electronically-Coupled MicroGrids.

Document Type : Research Studies

Authors

1 Professor of Electrical Engineering Department,. Faculty of Engineering., Mansoura University., Mansoura., Egypt.

2 Professor of Electrical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

3 Electrical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Abstract

MicroGrids are power generation and distribution systems in which users and generators are in close proximity, They usually have limited power generation capacity, and are networked together to meet a small area's load demand. MicroGrid, (MG) car operate interconnected to the main power network or be operated autonomously, if they are isolated from the power grid (islanded mode). The interconnection of large amounts of nontraditional generation causes problems in a network designed for conventional operation. The use of power electronics interfaces offers a potential solution. 
This paper presents a generalized formulation to determine the optimal operating strategy and cost optimization scheme for an electronically-coupled MicroGrid. The major objective is to minimize the overall operating cost considering both the p < strong>ower system and power electronics constraints in the two modes of the MG operation. The paper also presents steady-state, fundamental-frequency models of power electronic converters systems for coupling distributed generation (DG) units to the utility power grid based on Newton-Raplison and the developed models. A feature of the proposed approach is that it solves for the internal variables of each DG unit. A Matlab program is developed to represent the proposed algorithm. The program is tested in various network conditions and verified by applying it to a MG with three DG units from which two units are electronically-coupled to the grid in the two modes of operations. 

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