Technical Impacts of Grid Tied PV on JDECO Network: Case Study /Jericho and Al-Jeep Feeders

Year: 
2013
Discussion Committee: 
Prof. Dr. Marwan M. Mahmoud / Supervisor
Dr. Osama Omari / Co-Supervisor
Dr. Basim Alsayid / External Examiner
Dr. Emad Ibrik / Internal Examiner
Supervisors: 
Prof. Dr. Marwan M. Mahmoud / Supervisor
Dr. Osama Omari / Co-Supervisor
Authors: 
Rami Yaser Mohammad Dasa
Abstract: 
Using Power World Simulator, Low Voltage case study of Al-Jeep electrical distribution network was simulated and analyzed and PSI was projected on the network using 5 KWp grid tied PV systems .Then, the capacity of PV systems were increased and doubled, and each PV penetration level of 25%, 50%, 75%, 100% on the grid were simulated and investigated by modeling the one line diagram. Moreover, the PV systems using the simulator and the technical impacts regarding the power supply quality were examined. It was noted that as the penetration level of grid tied PV on the grid increased above 50% of the transformer load, the distribution transformer would suffer from very poor power factor values and reverse power flow was detected on the grid towards the source causing the grid to appear as a reactive power source only, which beside the law power factor value would lead to less efficient grid elements and equipment and to heating generation due to the reactive power flow which will decrease their life time. Although the lines losses decreased as the PV penetration level increased and voltage levels improved at 25% PV penetration level. However after 50% penetration level, over voltage on the grid appeared beyond the acceptable range according to IEC and grid code, especially on the rural feeder with high impedance and low loads, a significant current swing occurred and exceeded 100 A at 80% penetration level. On the M.V case study of Jericho network and Jericho Solar PV station, negligible technical impacts were noted on the current level of penetration which, the current capacity of the station, equals 300 KWp Different levels of PV penetration level on the M.V network where examined by raising the capacity of the solar station gradually. This was modeled using Power World Simulator and physical and real time data of Jericho network and Jericho solar station. No evidence of over voltage values where investigated at any PV penetration levels, but also no significant improving on the voltage level were noted on poor values buses voltages. Power factor of source bus decreased significantly as the penetration of the grid tied PV station capacity increased. Negligible effect of the line losses improvement appeared at all the tested penetration levels. An important current swing occurred beyond 50% penetration level. Regarding the M.V case, it’s recommended from the researcher point of view, as a result of this study, that it was more justified and preferable if the sight location of the solar station was shifted to a new position closer to the residential load (AL-Magtas station).this new geographical position was investigated using the simulator and better values resulted for voltage levels and losses. On the low voltage case study, the recommendation is to minimize the negative technical impact of the distributed PV generators on the conventional grid: • Using smart grid systems to monitor the grid performance hourly and control the energy exchange times to mitigate the negative impacts, and maximize the benefits. • Limiting the PV penetration level on the grid to 40% by the regulator for more safety. • Study a storage system on the grid to act as a buffering zone. • Limiting the penetration level of the grid tied PV system on the network (Feeder) to equal the minimum load of the feeder due to the potential rising of the voltage assuming no tap changing in L.V/M.V transformer.
Full Text: 
Pages Count: 
296
Status: 
Published