International Journal of Industrial Electronics and Drives
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International Journal of Industrial Electronics and Drives (2 papers in press)
Hybrid PV/FC System Design and Simulation by Samia Abdalfatah, Hilmy Awad, Hosam Hegazy, E.E. Elkholy Abstract: As the power generated by a Photovoltaic (PV) system is affected by the weather conditions, there must be storage units to store and deliver energy as per customer needs. One of the potential solutions to this issue is the integration of the PV generator with electrolytic hydrogen and fuel cell (FC). This paper proposes a hybrid-power system that combines a PV generator, Proton-Exchange-Membrane FC, Electrolyzes (ELZ) and hydrogen tanks to serve as energy storage. Depending on the amount of solar radiation, two approaches of connecting the PV generator and FCs are implemented. In the first approach, the FC acts like a backup for the PV system while with the second approach, a hybrid PV-FC generation system is employed. A model of the (ELZ) is implemented in order to simulate the production and storing of hydrogen. The operation of the fuel cell is simulated and analyzed using Matlab/Simulink where many of the encountered problems were solved. The simulation results of the proposed system prove that it can efficiently solve the intermittent nature of the PV energy systems while preserving the environment. Keywords: Hybrid power system; photo voltaic generators; PEM Fuel cell; and Hybrid storage system.
Analysis of resonance frequency at six-step induction motor drive with long cable connection in a geothermal plant by Sema Nur Ipek, Eyup Akpinar Abstract: In this paper, a six-step 120-degree induction motor drive with long cables connected to the induction motor at medium voltage level is analysed for predicting resonance frequency. These systems can be preferred to PWM-based drives in facilities such as geothermal power plants, mine plant and submarine oil wells, since the dead-time control is not issue in the inverter operation. The motor drive in the system contains semiconductor switching elements which generate the current and voltage harmonics in a wide range of frequency spectrum. The voltage and current harmonics at the inverter output lead to the resonance problems, torque and rotor speed fluctuations due to the capacitive effect of the long cables and the inductive effects of the cables, motors and transformers. The resonance in the network creates the overvoltage and overcurrent which can cause damage to the electrical components within the system. In this paper, analysis of resonance frequency at six-step 120-degree induction motor drive with long cable connection in a geothermal plant is performed first time in an analytical approach and C-type filter is suggested to suppress the resonance. Keywords: electric submersible drive systems; induction motor drive; resonance overvoltage; six-step drive. DOI: 10.1504/IJIED.2021.10040283