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Energies 2017, 10(8), 1083; doi:10.3390/en10081083

A Polar Fuzzy Control Scheme for Hybrid Power System Using Vehicle-To-Grid Technique

1
Department of Electrical Power and Machines, Zagazig University, Zagazig 44519, Egypt
2
Department of Electrical and Electronics Engineering, University of the Ryukyus, Okinawa 903-0213, Japan
*
Author to whom correspondence should be addressed.
Received: 12 May 2017 / Revised: 8 June 2017 / Accepted: 27 June 2017 / Published: 25 July 2017
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Abstract

A novel polar fuzzy (PF) control approach for a hybrid power system is proposed in this research. The proposed control scheme remedies the issues of system frequency and the continuity of demand supply caused by renewable sources’ uncertainties. The hybrid power system consists of a wind turbine generator (WTG), solar photovoltaics (PV), a solar thermal power generator (STPG), a diesel engine generator (DEG), an aqua-electrolyzer (AE), an ultra-capacitor (UC), a fuel-cell (FC), and a flywheel (FW). Furthermore, due to the high cost of the battery energy storage system (BESS), a new idea of vehicle-to-grid (V2G) control is applied to use the battery of the electric vehicle (EV) as equivalent to large-scale energy storage units instead of small batteries to improve the frequency stability of the system. In addition, EV customers’ convenience is taken into account. A minimal-order observer is used to estimate the supply error. Then, the area control error (ACE) signal is calculated in terms of the estimated supply error and the frequency deviation. ACE is considered in the frequency domain. Two PF approaches are utilized in the intended system. The mission of each controller is to mitigate one frequency component of ACE. The responsibility for ACE compensation is shared among all parts of the system according to their speed of response. The performance of the proposed control scheme is compared to the conventional fuzzy logic control (FLC). The effectiveness and robustness of the proposed control technique are verified by numerical simulations under various scenarios. View Full-Text
Keywords: hybrid power system; supply balance; frequency control; V2G; polar fuzzy; minimal-order observer hybrid power system; supply balance; frequency control; V2G; polar fuzzy; minimal-order observer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lotfy, M.E.; Senjyu, T.; Farahat, M.A.-F.; Abdel-Gawad, A.F.; Matayoshi, H. A Polar Fuzzy Control Scheme for Hybrid Power System Using Vehicle-To-Grid Technique. Energies 2017, 10, 1083.

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