Abstract
The fluctuation of production of renewable energy resources (RESs) is a big problem for its installation and integration in isolated residential buildings. A hybrid AC/DC microgrid facilitates the good operation of RESs with a storage system in standalone mode and the possibilities of smart energy management. In this paper optimization research of the hybrid ac/dc microgrid in isolated mode of operation is presented. The power system is supplied by various Renewable Energy Resources (RESs), Photovoltaic arrays (PVA), a Wind Turbine Generator (WTG), Diesel Generator (DG) and supported by Batteries Storage System (BSS) for short term storage. The main objective of this study is to optimize power flow within a hybrid ac/dc microgrid with regards to reliability in islanded mode. First a mathematical model optimized by mixed integer linear programming and solved by CPLEX solver with JAVA language is developed for an islanded RES system and then, based on the developed model, the power system control is simulated for different cases of off-grid mode. Simulation results have shown that the management strategy can maintain power balancing while performing optimized control and give a controllable loads and batteries charging/discharging powers, even with unpredictability of RESs powers outputs and arbitrary energy tariffs. Finally, the proposed algorithm respects the optimization in real-time operation under various constraints.%.
Highlights
In the past few decades, after the increase use of the AC technology in electric power systems among DC power, the DC technology has come back as an increasingly big rival with the advance of technology in power generation, conversion, consumption and transmission
The hybrid AC/DC Microgrids (HMG) has been modeled by HOMER software to provide a practical load demand data and real weather data of a residential building located in Avenue Agdal, Rabat, Morocco
The parameters quoted in table 3 are used for the implementation of the methodology followed for the energy management and the developed optimization. for the purpose of a similar and optimal system behavior, these parameters are chosen according to the energy configuration of the HMG (Zahboune et al 2016; Shenai et al 2011)
Summary
In the past few decades, after the increase use of the AC technology in electric power systems among DC power, the DC technology has come back as an increasingly big rival with the advance of technology in power generation, conversion, consumption and transmission. The main feature of HMG is that its AC and DC microgrid are combined in the same distribution grid, facilitating the direct integration of both AC- and DC-based distributed sources including generation, storage and loads. They are able to react to unforeseen situations facilitating the integration of renewable energy sources while increasing the quality of energy (Qachchachi et al 2016). This study aims to ensure an optimal synchronization of the different RESs components with load demand with minimal fuel consumption of diesel generators (Nejabatkhah et al 2019; Li et al 2019)
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