Abstract
This paper investigates the control performance of a physical configuration of a microgrid (MG), integrated with photovoltaic (PV) arrays, battery energy storage systems (BESSs), and variable loads. The main purpose is to achieve cooperative optimal control under both grid-connected and islanded modes for the MG. For the grid-connected mode, a voltage source inverter (VSI) based on swoop control is used to control the MG connection to the grid even if PV arrays are under partially shading conditions (PSC). Then, for the islanded mode, the paper analyzes the model of the PV unit and BESS unit detailed from the small signal point of view and designs the suitable control strategy for them. Finally, the whole MG system combines the droop control and the main/slave control to stabilize the DC bus line voltage and frequency. Both simulation and experimental results confirm that the proposed method can achieve cooperative control of the MG system in both grid-connected and islanded mode.
Highlights
IntroductionIn order to overcome these drawbacks, methods were proposed by combining lowbandwidth communications with average power sharing, droop control, and extra harmonic compensation control loops [12, 13]
To address the challenges of tackling climate change and maintaining energy security, many countries worldwide are committed to decarbonizing their energy systems
The microgrid (MG) concept [1,2,3,4], which represents a cluster of interconnected distributed generation (DG), loads, and intermediate battery energy storage systems (BESSs), has caught many researchers’ interest
Summary
In order to overcome these drawbacks, methods were proposed by combining lowbandwidth communications with average power sharing, droop control, and extra harmonic compensation control loops [12, 13]. The whole MG system combines the droop control and the main/slave control to stabilize the DC bus line voltage and frequency Both simulation and experimental results confirm that the proposed method can achieve cooperative control of the MG system in both grid-connected and islanded mode. Both simulation and experimental results confirm that the proposed algorithm can automatically track the global power point under different isolation conditions and coordinated control of the MG is achieved.
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