PROJECT TITLE :
System Operation and Energy Management of a Renewable Energy-Based DC Micro-Grid for High Penetration Depth Application
A renewable energy-based dc micro-grid with hybrid energy storage, consisting of battery and ultracapacitor, is investigated. To attain high penetration depth of renewable sources into the utility grid, a completely unique system operation strategy and therefore the corresponding energy management methodology is proposed. In the operation strategy, the ultracapacitor unit works as the only real voltage supply of the micro-grid to support the dc link in both connected and islanding mode. The micro-grid is controlled to deliver/absorb predefined quantity of power to/from the utility grid during connected mode and zero during islanding mode. This style can definitely simplify the power dispatching algorithm of the power system and increase the chance of as well as massive quantities of micro-grids into the utility grid. The energy management technique is dedicated to conducting the net power of the micro-grid effectively. The web power is separated into high- and low-frequency parts. The high-frequency power is suppressed by the ultracapacitor automatically and the low frequency power is shared by the battery and an adjustment unit. A little-scale dc micro-grid structure with one dc link is considered for investigation. MATLAB/Simulink simulation results are presented to validate the proposed system operation strategy and the energy management methodology.
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