Integration of Solar Photovoltaic (PV) generation into an existing distribution system has many impacts on the system, with the power flow being one of the major issues. This impact is not generic for any network, but it may manifest itself either positively or negatively, depending on the grid configuration, interface control modes, operation mode, and load profile. Grid-connected PV systems have three control options of the local voltage controller of the interface DC-AC converter. These control modes are Power Factor control, voltage control, and Droop Voltage control. This paper aims at evaluating and comparing the impacts of those control modes on the grid power flow. A set of evaluation criteria and indices is defined and mathematically formulated. Based on the requirements of the used program (Power Factory Dig Silent V14.1.3), a computation plan (algorithm) has been proposed. The algorithm has been applied to a typical weak network and a wide range of simulations has been carried out. Simulation results have been thoroughly discussed and important findings have been concluded.
References
[1]
Gardiner, B. (2013) Bypassing the Power Grid Published. Special Report October 8. http://www.nytimes.com/
[2]
Shah, R., Mithulananathan, N. and Bansal, R. (2012) Influence of Large-Scale PV on Voltage Stability of Sub-Transmission System. International Journal on Electrical Engineering and Informatics, 4, 148-161.
[3]
Eltawil, M.A. and Zhao, Z. (2010) Grid-Connected Photovoltaic Power Systems: Technical and Potential Problems. Review of Renewable and Sustainable Energy, 14, 112-129. http://dx.doi.org/10.1016/j.rser.2009.07.015
[4]
Thong, V.V., Vermeyen, P., Driesen, J. and Belmans, R. (2004) Grid Connection Aspects of Distributed Generation. Proceedings of UIE International Conference, Durban, 18-23 January 2004, 14.
[5]
Al-Omari, Z. and Abdallah, J. (2008) Modeling Additional Operational Costs Incurred Due to Absent of the Optimal Correction in Electrical Systems. Journal of Applied Sciences, 8, 4422-2227.
DIgSILENT GmbH, Germany (2011) Technical Documentation for Power Factory® Simulation Tool. Copyright 2011. http://www.digsilent.de/
[8]
González-Longatt, F.M. (2007) Impact of Distributed Generation over Power Losses on Distribution System. Proceedings of 9th International Conference Electrical Power Quality and Utilization, Loughborough University, UK, 2007, 9-11.
[9]
Balamurugana, K., Srinivasana, D. and Reindlb, T. (2012) Impact of Distributed Generation on Power Distribution Systems. Energy Procedia, 25, 93-100. http://dx.doi.org/10.1016/j.egypro.2012.07.013
[10]
Canova, A., Giaccone, L., Spertino, F. and Tartaglia, M. (2009) Electrical Impact of Photovoltaic Plant in Distributed Network. IEEE Transactions on Industry Applications, 45, 341-347.
[11]
Sheikhi, A., Maani, A., Safe, F. and Ranjbar, A.M. (2013) Distributed Generation Penetration Impact on Distribution Networks Loss. Proceeding of International Conference on Renewable Energies and Power Quality (ICREPQ’13), Bilbao, 20-22 March 2013.
