Abstract
Stand-alone microgrids integrating renewable energy sources have emerged as an efficient energy solution for electrifying isolated sites, such as islands and remote areas. The design of a microgrid involves various influential factors, including technological development, economic feasibility, and environmental impacts, based on the conditions and regulations of a particular site. This paper proposes a comprehensive microgrid design framework based on power system analysis and techno-economic analysis. The obtained optimal microgrid configuration satisfies both the design objective and power system performance regulations. The proposed design approach focuses on using practical data and can adapt to any microgrid design problems based on the local characteristics of a specific site. The practicality and effectiveness of the design framework are validated by applying it to the design of a stand-alone microgrid for Deokjeok Island in South Korea. The case study results justify the importance of considering site-specific characteristics and the impacts of power system conditions on the optimal microgrid design.
Highlights
Energies 2021, 14, 457. https://Electricity demands have increased exponentially in recent decades, resulting in technical and economic challenges for conventional power grids in supplying higher demands reliably
As indicated in the proposed microgrid design framework, in addition to the design constraints obtained from the power system analysis, the input data for techno-economic analysis include load demand and renewable energy resources data for a complete year with a typical time-step of 1 h, the associated costs of distributed energy resources (DERs) technologies, and financial parameters for the calculation of economic metrics
This paper proposed a microgrid design framework based on power system analysis and techno-economic analysis, which targets practical microgrid designs
Summary
Electricity demands have increased exponentially in recent decades, resulting in technical and economic challenges for conventional power grids in supplying higher demands reliably. The studies presented in [24,25] discussed microgrid design methods based on techno-economic analysis considering environmental emission objectives and constraints. The optimal sizing of DER technologies was determined to minimize the system cost of energy (COE) considering a microgrid reliability constraint, which is the deficiency of power supply probability [30]. Most of the design approaches in the literature do not consider the impacts of existing power system conditions at the site This is a crucial consideration, especially for the design of standalone microgrids with a high penetration of renewable energy. Off-grid hybrid renewable energy systems are represented by their low system inertia, making the system frequency vulnerable to instantaneous power imbalances caused by RES output intermittency [32] This is a technically unique and challenging feature of stand-alone microgrids compared to grid-connected systems.
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