Abstract
This paper proposes a general demand-side management strategy in microgrids with the presence of renewable sources. To apply proposed above strategy by electric price in Vietnam, it must be participated of photovoltaic and wind power generations and energy storage. An algorithm applied for this program is created by comparing amount of energy generating from generations and consumed by electric load. Amount of energy that must be bought from the grid or sells to it can be calculated by dispatching energy between hours that have the lowest electric price level and hours that have the medium and highest electric price levels. A case study that energy generating from generations is not equal energy consumed by load in hours having the medium and highest electric price levels is made more detailed in this paper. Algorithms to dispatch energy at any time to achieve the purpose of not buying electricity from the grid in above hours basing on electric price levels, efficiency of energy conversion, rated capacity of units and analysis of power flows in whole system. Results providing from algorithms are energy that must be bought from the grid or sell to the grid, instantaneous capacity of energy storage. Simulation results corresponding to this case study carried out in MATLAB 2018a present the meaning and feasibility of proposed contents.
Highlights
Renewable sources have been implemented widely in electric power systems (EPS), where photovoltaic power generation (PVG) and wind generation (WG) are the most popular
Amount of power reacted upon the grid can be dispatched by demand-side management (DSM) programs to balance power generating from generations and demand of electric load in the range of considered time [5,6,7,8,9]
This paper proposed a general DSM strategy to operate any microgrid with the presence of PVG, WG and energy storage (ES) in Viet Nam EPS
Summary
Renewable sources have been implemented widely in electric power systems (EPS), where photovoltaic power generation (PVG) and wind generation (WG) are the most popular. These generations can be coupled in common DCbus or ACbus structure at each bus in EPS to become a microgrid. A DSM program applied in a specific case study is proposed to determine power flows in whole system and amount of energy that must be bought from EPS or sell electricity to EPS. The last section will show some conclusions and contributions of this paper
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