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Title: Performance Enhancement of PV Grid Connected Systems
Authors: Heba M. R. Abdullah 
Supervisor: Dr. Rashad Mohammeden Kamel
Keywords: PV Grid : system
Issue Date: 2018
Publisher:  Kuwait university - college of graduate studies
Abstract: This research studied the effect of integrating Photovoltaic (PV) panels on the performance of distribution systems. A study case has been chosen for the integration of a 10MWp PV system with one of Kuwait Oil Company's power grids. In the practical study case, multiple PV panels have been integrated with the existing power grid of KOC which feeds in parallel with the utility grid. The power system studies were customized under specific conditions of Kuwait environment, power grid properties, Ministry of Electricity & Water regulations and economical resources. The PV system was modelled in PVSyst© for performance estimation. The annual global incidence for the installed system is 2208.5 kWh/m2/yr. Optimized tilt angle for maximum annual generation is at 25 tilt, 10 for summer and 50 for winter. The impact of the PV plant on the load profile was -29% annual reduction. The problems which arise from integrating distributed generation were formulated and solved through recommendations for inverter control. It was concluded that the inverter to PV ratio needs to be 110% to enable the inverter for power factor correction and voltage regulation for the installed system. The enhancement of the grid connected PV system with maximum penetration was investigated without modification of the existing connected grid. Load flow simulation was performed by Matlab© and maximum penetration was found to be 13.6 MW during normal operation conditions. The inverter was used to increase maximum penetration for systems limited by voltage and needed to be 130% of installed PV size. Other configurations were studied for maximum penetration. The monitoring system was enhanced by designing an Artificial Neural Network (ANN) for PV monitoring utilizing the distribution system existing relays. Matlab© was used for modeling the ANN which showed good performance with 10-6 progression error from target. Monitoring has been implemented for performance diagnoses of the PV plant at the distribution side without the need for communication cables. PV short circuit contribution causes the relay impedance to fall out the protection zone during single phase faults. PV contribution on fault currents does not exceed (2.2 p.u.). At the end economic and environmental studies have been carried out to justify utilizing PV distributed generation. The PV system installation cost was 2.57 USD/Wp and had a cash back after 14 yrs. with electricity rate 0.12 $USD/kWh and discount rate 8%. The PV project is feasible if the electricity rate is 0.17 $USD/kWh. The PV generation is equivalent to 312,220 tCO2e over 25 yrs.
Appears in Programs:0610 Electrical Engineering

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