Title: Power quality improvement of microgrid fed electric ship using fuzzy controlled multi-pulse/multi-level converter-based VFD

Authors: Ahmed Abdel Hamid Mansour; Ahmed A. Hossam-Eldin; Mohamed Elsaid Elgamal; Karim Hassan Youssef

Addresses: Department of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt ' Department of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt ' Department of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt ' Department of Electrical Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt

Abstract: This paper investigates a harmonic mitigation technique for modern electrical propulsion ships (EPS) microgrids (MG) using a fuzzy controlled multi-pulse rectifier (MPR) and multi-level inverter (MLI)-based variable frequency drive (VFD). In this paper, the proposed MPR-MLI-VFD system is studied using different-pulses rectifiers and different-level inverter-based VFD to achieve proper mitigation of the harmonics in the main generating power system of the ships within the marine classification society's limitations for harmonics. This is achieved using a proposed low harmonic multi-pulse rectifier based on zigzag transformers. Moreover, the voltage harmonic distortions at propulsion motor feeder buses are minimised using the proposed MLI. A simple fuzzy logic control system is proposed for the VFD speed control. The voltage balancing control system for the diode clamped multi-level inverters is implemented using a fuzzy control system. MATLAB/Simulink is used for the simulation and validation process.

Keywords: power quality; harmonic mitigation; electrical propulsion ship; EPS; multi-level inverter; MLI; MLI voltage balancing; multi-pulses rectifier; MPR; fuzzy logic control; variable frequency drive; VFD.

DOI: 10.1504/IJPELEC.2023.131189

International Journal of Power Electronics, 2023 Vol.17 No.4, pp.495 - 518

Received: 02 Apr 2021
Received in revised form: 20 Apr 2022
Accepted: 24 Apr 2022
Published online: 01 Jun 2023 *

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