Abstract
In this work, the evaluation of the design and optimization of proposed offgrid hybrid microgrid systems for different load dispatch strategies is presented by assessing the component sizes, system responses and different cost analyses of the proposed system. This study optimizes the sizing of the Barishal and Chattogram (two popular divisions in Bangladesh) hybrid microgrid systems consisting of wind turbine, storage unit, solar PV, diesel generator and a load profile of 27.31 kW for five dispatch techniques: (i) generator order, (ii) cycle charging, (iii) load following, (iv) HOMER predictive dispatch and (v) combined dispatch strategy. The considered microgrids are optimized for the least CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> gas emission, Net Present Cost, and Levelized Cost of Energy. The two microgrids are analyzed for the five dispatch techniques using HOMER software, and subsequently, the power system performance and feasibility study of the microgrids are performed in MATLAB Simulink. The results in this research provide a guideline to estimate different component sizes and probable costing for the optimal operation of the proposed microgrids under various load dispatch conditions. The simulation results suggest that `Load Following' is the best dispatch strategy for the proposed microgrids having a stable power system response with the lowest net present cost, levelized cost of energy, operating cost, and CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> emission rate. Additionally, the combined dispatch strategy is determined to be the worst dispatch technique for the proposed off-grid hybrid microgrid design having the maximum levelized cost of energy, net present cost, operating cost and CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> emission.
Highlights
The demand for power is increasing rapidly due to globalization and industrialization
A study to explore the design of an optimal size MG system for two-division is exposed and the voltage and frequency responses of that MG are described through the use of various dispatch strategies
OPTIMAL SIZING OF THE PROPOSED MICROGRID Table 1 reports a comparative study on basis of proposed MG’s CO2 emissions, COE and Net Present Cost (NPC) among the five different dispatch techniques for the two divisions according to HOMER simulation
Summary
The demand for power is increasing rapidly due to globalization and industrialization. Various power sources is increasing which increases carbon emissions and associated costs, resulting in a focus by many countries on investment in alternative sources of energy. Hybrid alternating current (AC)/ direct current (DC) MGs contain both DC and AC buses which can integrate both DC and AC sources and loads in the network [10] To introduce these sources with conventional power sources, an appropriate energy management system (EMS) is needed [11]. A control strategy is developed here for a MG, but no optimization or dispatch strategy was considered
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