Abstract
Distributed generation (DG) and electric vehicle (EV) are increasingly installed in the modern microgrids (MGs). This demands for an improvement in the power handling capacity of the existing distribution feeders. The power handling capacity of a feeder is limited by the voltage magnitude violation caused by overloading. The smart transformer (ST) is proposed as an effective solution for improving the performance of modern MG. This paper utilizes the power management capabilities of the ST with an integrated battery energy storage system (BESS) for improving the power handling capacity of a medium voltage (MV) 5-bus radial feeder. The proposed method demonstrates the ST's capability to control the active and/or reactive power flow at the MV grid for maintaining the steady-state voltage magnitude within the grid-specified limit. A sensitivity analysis based design study is proposed to determine the power rating requirements for different ST and BESS converters during distinct power control scenarios. The analysis shows the capability of ST in injecting/absorbing active and reactive powers in flexible combinations for achieving the desired voltage magnitudes. The findings are verified through simulation and experimental results.
Highlights
The penetration of distributed generation (DG) sources and electric vehicles (EVs) are increasing rapidly in the modern power system [1], [2]
2) smart transformer (ST) DC-DC CONVERTER When steady-state voltage is within the limit, the ST dc-dc converter should maintain the active power flow from medium voltage (MV) grid and the maximum active power loading considered in this case is 0.29 p.u
Loading on all the four buses are considered to be uniform throughout the simulation study at a constant lagging power factor of 0.95
Summary
The penetration of distributed generation (DG) sources and electric vehicles (EVs) are increasing rapidly in the modern power system [1], [2]. Active and the reactive powers at a particular bus [6] These factors are used to control the voltage rise by managing the active power flow from PV sources in radial distribution grids [7]. The hosting capability improvement using STATCOM is effective in distribution grids with a low R/X ratio since it utilizes the reactive power exchange. The ST integrated with BESS has the capability for flexible active and reactive power exchange with the MV grid This potential is not explored in the literature for improving the TABLE 1. This paper proposes a method to enhance the hosting capability of a 5-bus radial distribution system using the power management features of BESS integrated ST.
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