Distributed Control in Hybrid AC-DC Microgrids Based on a Hybrid MCSA-ADMM Algorithm

Behnaz Papari,Christopher S Edrington,Payam Ramezani Badr,Huu P Hoang,Robert Cox,Gokhan Ozkan,Hesam Parvaneh

doi:10.1109/ojia.2021.3075056

Abstract

This paper proposes an effective framework for optimal operation management of hybrid AC-DC microgrids incorporating both dispatchable and non-dispatchable energy sources as well as battery storage. The proposed method is constructed based on a fully distributed consensus-based structure making use of a multi-agent mechanism and alternating direction method of multipliers (ADMM). The proposed framework decomposes the microgrid into several agents within which the neighboring agents share the consensus variable (mismatch power flow) with each other. Each agent tries to minimize its own cost based on the consensus variable value received from the other agents. An augmented objective function is then formulated which is nonlinear and needs to be optimized. Due to the high nonlinearity of the objective function, a new optimization method based on crow search algorithm (CSA) is developed to find the optimal local solutions for each agent and drive the ADMM to have a mature convergence. A modified method based on crossover and mutation operators is introduced to increase the search ability of CSA. The performance of the proposed framework is assessed using a typical hybrid AC-DC microgrid with distributed energy resources. The simulation results show the high efficacy of the proposed method in comparison with other methods.

Highlights

According to the power and energy society, microgrid (MG) is defined as a set of distributed generations (DGs) and interconnected loads with specified electrical borders [1]
The hybrid AC-DC MGs is considered as case study which divided to five sub-systems (S1-S5)
There are two wind turbines (WT) considered in the MG with similar patterns but different capacities, one

Summary

Introduction

According to the power and energy society, microgrid (MG) is defined as a set of distributed generations (DGs) and interconnected loads with specified electrical borders [1]. Reducing the power losses, operation costs, voltage deviation, increasing reliability and average energy supplied to the consumers are other primary benefits coming out of the MG concept [2], [3]. This has motivated the researchers in recent years to focus on different aspects of microgrid technology. In comparison with the rich research works done on the AC MGs and DC MGs, the hybrid AC-DC MGs still need more research to clarify their different aspects

Objectives

Results

Discussion

Conclusion