Hybrid Power Plant with Storage System: University Research Station (original) (raw)
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This paper focuses on response analysis of Microgrid which consists of wind turbines, photovoltaic panels, with Hybrid DC and AC Buses. In grid-connected operation, voltage of DC bus is kept steady by the inverter. Energy Management System controls hybrid storage system to release or absorb power with the strategies according to grid condition, state of charge of batteries and super-capacitor, electricity price and so on. In islanded operation, voltage of DC bus is controlled by storage system and amplitude and frequency of AC Bus voltage are regulated by parallel inverters with voltage-frequency or droop control strategy. In this work, different control strategies in grid-connected and islanded operation are described which can keep power balanced and AC/DC bus stable. A test case of Permanent Magnet Synchronous Generator connected to a rectifier and inverter has been simulated in MATLAB/Simulink environment and from the results it can be shown that the voltages of AC and DC buses have been maintained steadily. The output voltage from PV modules is lifted using boost converter and given to maximum power point tracking system. The output is connected in parallel with the input from wind system to a common inverter and given to a common load. The desired outputs, power, voltage and current of AC side is observed and maintained within rated values.
— A prototype of a hybrid renewable energy system (HRES), which includes solar energy, wind energy, and battery storage, was designed, implemented and installed in one of the laboratories of the College of Engineering at Sultan Qaboos University (SQU). The system can be upgraded to a small-scale microgrid, which may be used as a stand-alone renewable energy system for remote rural applications or may be connected to the low-voltage (LV) power network capable of importing/exporting electrical energy. In the latter application, it is suitable for residential homes. To have a better understanding of how this HRES may operate, various scenarios of operation were tested. Graphs of the microgrid performance in some of these scenarios are provided in this paper.