Abstract
Micro-Grid (MG) is a small-scale power network associated with Renewable Energy Sources (RES), Energy Storage System (ESS) and local critical loads. MGs can either be connected to the main grid or operate stand-alone. Due to variable nature of RES such as Photovoltaic (PV) solar cells, ESS become necessary to maintain reliability of power supply to critical loads during islanded mode. During grid connected mode, ESS is used to support the grid or MG depending on the grid operator and energy management functions. On the other hand, the power converters interfaced ESS can be used to provide additional services to the main grid, such as reactive power and unbalanced compensation. This paper presents a control strategy for an Energy Storage Power Converter (ESPC) in MGs, in order to mitigate the negative effects of grid connected MGs working with highly unbalanced operation and poor power factor conditions. Simulation results have been carried out by using Matlab – Simulink software to verify the effectiveness of the proposed control scheme.
Highlights
As it is well known, Integrating Distributed Generation (DG) units are becoming more and more important, due to their advantages in improvement of the overall efficiency, sustainability and reliability of power system [1, 2]
During normal operating conditions the MGs work in grid connected mode, while, during disturbances MGs work with islanded mode, in which the generation and corresponding loads can be separated from the distribution system, to isolate the MG loads from the disturbance without harming the transmission grid’s integrity [5]
This paper proposes a control scheme for Energy Storage Power Converter (ESPC) to mitigate the negative effects of unbalanced operation and performs other functions based on the grid operator and MG conditions, like supporting the grid with active power, supporting the MG during power generation shortage, power
Summary
As it is well known, Integrating Distributed Generation (DG) units are becoming more and more important, due to their advantages in improvement of the overall efficiency, sustainability and reliability of power system [1, 2]. In low voltage MGs the output power of single phase PV inverters and residential loads are various and highly dependent on the surrounding conditions and the end-users behaviors which lead to unbalanced operation of MGs. The unbalanced causes serious problems such as limited the power exchange between MGs and the main grid, unbalanced faults, asymmetrical voltage drops, more losses, loads failure [7] and abnormal operation of sensitive equipments in the MGs. The MGs are supposed to be grid friendly when connected to the external grid the unbalanced currents should preferably be handled within the MGs. This paper proposes a control scheme for ESPC to mitigate the negative effects of unbalanced operation and performs other functions based on the grid operator and MG conditions, like supporting the grid with active power, supporting the MG during power generation shortage, power. Connected PV Micro-Grids quality improvements and reactive power compensation
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