While renewable power generation and vehicle electrification are promising solutions to reduce greenhouse gas emissions, it faces great challenges to effectively integrate them in a power grid. The weather-dependent power generation of renewable energy sources, such as Photovoltaic (PV) arrays, could introduce significant intermittency to a power grid. Meanwhile, uncontrolled PEV charging may cause load surge in a power grid. This paper studies the optimization of PEV charging/discharging scheduling to reduce customer cost and improve grid performance. Optimization algorithms are developed for three cases: 1) minimize cost, 2) minimize power deviation from a pre-defined power profile, and 3) combine objective functions in 1) and 2). A Microgrid with PV arrays, bi-directional PEV charging stations, and a commercial building is used in this study. The bi-directional power from/to PEVs provides the opportunity of using PEVs to reduce the intermittency of PV power generation and the peak load of the Microgrid. Simulation has been performed for all three cases and the simulation results show that the presented optimization algorithms can meet defined objectives.
References
[1]
EPA (2014) Global Greenhouse Gas Emissions Data. http://www3.epa.gov/climatechange/ghgemissions/global.html
[2]
Ahourai, F., Huang, I. and Al Faruque, M.A. (2013) Modeling and Simulation of the EV Charging in a Residential Distribution Power Grid. Proceedings of Green Energy and Systems Conference, Long Beach, 25 November 2013.
[3]
Cao, Y.J., Tang, S.W., Li, C.B., Zhang, P., Tan, Y., Zhang, Z.K. and Li, J.X. (2012) An Optimized EV Charging Model Considering TOU Price and SOC Curve. IEEE Transactions on Smart Grid, 3, 388-393.
http://dx.doi.org/10.1109/TSG.2011.2159630
[4]
Sortomme, E. and El-Sharkawi, M.A. (2011) Optimal Charging Strategies for Unidirectional Vehicle-to-Grid. IEEE Transactions on Smart Grid, 2, 131-138. http://dx.doi.org/10.1109/TSG.2010.2090910
[5]
Jin, C.R., Tang, J. and Ghosh, P. (2013) Optimizing Electric Vehicle Charging with Energy Storage in the Electricity Market. IEEE Transactions on Smart Grid, 4, 311-320. http://dx.doi.org/10.1109/TSG.2012.2218834
[6]
Tushar, W., Yuen, C., Huang, S., Smith, D.B. and Vincent Poor, H. (2016) Cost Minimization of Charging Stations with Photovoltaics: An Approach with EV Classification. IEEE Transactions on Intelligent Transportation Systems, 17, 156-169. http://dx.doi.org/10.1109/TITS.2015.2462824
[7]
Castello, C.C., LaClair, T.J. and Curt Maxey, L. (2014) Control Strategies for Electric Vehicle (EV) Charging Using Renewables and Local Storage. 2014 IEEE Proceeding of Transportation Electrification Conference and Expo (ITEC), Dearborn, 15-18 June 2014, 1-7. http://dx.doi.org/10.1109/ITEC.2014.6861835
[8]
Weckx, S. and Driesen, J. (2015) Load Balancing with EV Chargers and PV Inverters in Unbalanced Distribution Grids. IEEE Transactions on Sustainable Energy, 6, 635-643. http://dx.doi.org/10.1109/TSTE.2015.2402834
[9]
Bhattarai, B.P., Bak-Jensen, B., Pillai, J.R., Gentle, J.P. and Myers, K.S. (2015) Overvoltage Mitigation Using Coordinated Control of Demand Response and Grid-Tied Photovoltaics. Proceeding of IEEE Conference on Technologies for Sustainability, Ogden, 30 July-1 August 2015, 83-89.
[10]
Gao, S., Chau, K.T., Liu, C.H., Wu, D.Y. and Chan, C.C. (2014) Integrated Energy Management of Plug-In Electric Vehicles in Power Grid With Renewables. IEEE Transactions on Vehicular Technology, 63, 3019-3027.
http://dx.doi.org/10.1109/TVT.2014.2316153
[11]
Pacific Northwest National Laboratory (2014) GridLab-D. http://www.gridlabd.org/
[12]
Office of Energy Efficiency & Renewable Energy (2013) Commercial and Residential Hourly Load Profiles for All TMY3 Locations in the United States [Online].
http://en.openei.org/doe-opendata/dataset/commercial-and-residential-hourly-load-profiles-for-all-tmy3 -locations-in-the-united-states
[13]
Deru, K.F.M., Studer, D., Benne, K., Griffith, B. and Torcellini, P. (2011) U.S. Department of Energy Commercial Reference Building Models of the National Building Stock.
http://energy.gov/eere/buildings/commercial-reference-buildings
[14]
Perez, R., Ineichen, P., Seals, R., Michalsky, J. and Stewart, R. (1990) Modeling Daylight Availability and Irradiance Components from Direct and Global Irradiance. Solar Energy, 44, 271-289.
http://dx.doi.org/10.1016/0038-092X(90)90055-H
[15]
Salt River Project (2016) Business Time-of-Use Plan. http://www.srpnet.com/prices/business/tou.aspx
