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10006047
Determination of the Optimal DG PV Interconnection Location Using Losses and Voltage Regulation as Assessment Indicators Case Study: ECG 33 kV Sub-Transmission Network
Abstract:
In this paper, CYME Distribution software has been used to assess the impacts of solar Photovoltaic (PV) distributed generation (DG) plant on the Electricity Company of Ghana (ECG) 33 kV sub-transmission network at different PV penetration levels. As ECG begins to encourage DG PV interconnections within its network, there has been the need to assess the impacts on the sub-transmission losses and voltage contribution. In Tema, a city in Accra - Ghana, ECG has a 33 kV sub-transmission network made up of 20 No. 33 kV buses that was modeled. Three different locations were chosen: The source bus, a bus along the sub-transmission radial network and a bus at the tail end to determine the optimal location for DG PV interconnection. The optimal location was determined based on sub-transmission technical losses and voltage impact. PV capacities at different penetration levels were modeled at each location and simulations performed to determine the optimal PV penetration level. Interconnection at a bus along (or in the middle of) the sub-transmission network offered the highest benefits at an optimal PV penetration level of 80%. At that location, the maximum voltage improvement of 0.789% on the neighboring 33 kV buses and maximum loss reduction of 6.033% over the base case scenario were recorded. Hence, the optimal location for DG PV integration within the 33 kV sub-transmission utility network is at a bus along the sub-transmission radial network.

References:

[1] Ghana Grid Company Limited (GRIDCo), 2014 Electricity Supply Plan: GRIDCo, Tema: 2014.
[2] Ministry of Energy, Republic of Ghana: National Energy Policy: February, 2010.
[3] International Renewable Energy Agency (IRENA) Working Paper, “Renewable Energy Technologies: Cost analysis series, Volume 1: Power sector: Issue 4/5, Solar Photovoltaics”, June 2012. p.12 – 13.
[4] S. J. Lewis, “Analysis and Management of the Impacts of a High Penetration of Photovoltaic Systems in an Electricity Distribution Network.” Innovative Smart Grid Technologies Asia (ISGT).” p.1 – 7, IEEE PES, 2011.
[5] A. Sheikhi, A. Maani, F. Safe, A. M. Ranjbar, “Distributed Generation Penetration Impact on Distribution Networks Loss” International Conference on Renewable Energies and Power Quality (ICREPQ ’13), Spain 20th – 22nd March, 2013.
[6] Lucian Ioan Dulau, Mihail Abrudaen, Dorin Bica, “Effects of Distributed Generation on Electric Power Systems.” The 7th International Conference in Interdisciplinarity in Engineering (INTER – ENG 2013), Pg. 681 – 686, 2013.
[7] Abraham Ellis, “Grid operations and High penetration PV”, Sandia National Laboratories. Utility/Lab workshop on PV Technology and Systems, November 8 – 9, 2010, Tempe, Arizona. Available: http://www1.eere.energy.gov/solar/pdfs/2010ulw_ellis.pdf
[8] Wei Song, Xinghua Zhou, Xiaolong Liu, Hongting Zhou, “A study on impacts of Distributed Generation voltage in Distribution network system.” Asia Pacific Energy Equipment Engineering Research Conference (AP3ER 2015), 2015.
[9] Global Energy Consulting Engineers India, “National Technical and Commercial Loss Study for ECG & VRA/NEDCo, Ghana” submitted to the Ministry of Energy, Government of Ghana, 2012.
[10] IEEE Standards Coordination Committee 21, “IEEE Application Guide for IEEE Std. 1547™, IEEE Standard for Interconnecting Distributed Resources with Electric Power Systems” IEEE, 3 Park Avenue New York (NY), 15th April 2009
[11] Ing. Godfred Mensah, “Basic System Planning for ECG Staff.”, System Planning Division, Electricity Company of Ghana (ECG), November 2015.
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