TAILIEUCHUNG - A control strategy based on fuzzy logic for three-phase grid-connected photovoltaic system with supporting grid frequency regulation

This paper presents a control strategy based on fuzzy logic to inject efficiently the active power from a three-phase grid-connected photovoltaic (PV) system into the local grid with supporting regulation for the frequency of grid voltage. In which the control strategy consists of three main modules as follows. | Journal of Automation and Control Engineering Vol. 4, No. 2, April 2016 A Control Strategy based on Fuzzy Logic for Three-phase Grid-connected Photovoltaic System with Supporting Grid-frequency Regulation Nguyen Gia Minh Thao and Kenko Uchida Department of Electrical Engineering and Bioscience, Waseda University, Tokyo, Japan Email: {thao, kuchida}@ strategy used two 49-rule fuzzy logic controllers (FLCs) to determine the reference value for active power needed to inject into the grid. Besides, according to [6, 7], gridconnected PV systems with the battery bank have been utilized to regulate the grid frequency. Nevertheless, the common drawback of most these studies is that the stateof-charge (SOC) of battery bank has not been regulated in the safe range of [ ] to ensure durability of battery. On the other hand, a grid frequency control technique based on power curtailment using the Newton quadratic interpolation (NQI) for the PV grid-connected system without energy storage has been presented in [8]. The technique utilizes fairly many calculation steps to force PV arrays to operate exactly according to the reference power value. This may reduce the response speed of the technique. Referring in [9], a double-layer capacitor and a proportional controller for grid-connected PV system have been used to regulate grid frequency. The control method has not only the pretty simple structure but also good performances. However, effects of AC-system load in the grid have not yet been considered in the study. Motivated by the above observation, in this paper, the proposed control strategy for three-phase grid-connected PV system with a battery bank to support grid-frequency regulation has three main objectives as follows. i. The output active power from the PV system delivered to the grid is adjusted suitably to ensure the grid frequency in tolerable ranges. In this study, two acceptable ranges for frequency deviation are ± Hz in transient .

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