Abstract
In this paper, a centralized control strategy for the efficient power management of power converters composing a hybrid AC/DC microgrid is explained. The study is focused on the converters connected to the DC bus. The proposed power management algorithm is implemented in a microgrid central processor which is based on assigning several operation functions to each of the generators, loads and energy storage systems in the microgrid. The power flows between the DC and AC buses are studied in several operational scenarios to verify the proposed control. Experimental and simulation results demonstrate that the algorithm allows control of the power dispatch inside the microgrid properly by performing the following tasks: communication among power converters, the grid operator and loads; connection and disconnection of loads; control of the power exchange between the distributed generators and the energy storage system and, finally, supervision of the power dispatch limit set by the grid operator.
Highlights
Most countries are dependent on fossil fuels and nuclear energy for electric power generation.due to the increasing energy demand and the proliferation of new forms of energy generation which are cheaper and environmentally-friendly, many distributed generation (DG) systems have been integrated into the power grid
The proposed power management algorithm has been simulated by means of PSIMTM [31] under various scenarios
It is worth pointing out that step changes of irradiation shown in Table 3 do not correspond to reality, but they allow us to study the behavior of the MG and the stability of the buses in very extreme cases
Summary
Most countries are dependent on fossil fuels and nuclear energy for electric power generation.due to the increasing energy demand and the proliferation of new forms of energy generation which are cheaper and environmentally-friendly, many distributed generation (DG) systems have been integrated into the power grid. Some DGs consist of Renewable Energy Sources (RES), such as Photovoltaic (PV), wind, biomass and geothermal [1]. The DGs are the basis of Microgrids (MGs), which can operate as a single power system that provides a safe and reliable operation at certain voltage and load levels. MGs may work in island-mode or in grid-connected mode, so that they can connect to DGs placed at various locations and inject their energy to the grid if it is needed [2]. The transition between these two operation modes is a process that can destabilize the voltage at the MG buses and damage the MG. In [3], a methodology to recover the MG operation during this transition was presented, along with the main technical problems which should be taken into account
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