Solar farm hourly dispatching using a supercapacitor and battery energy storage system

WCU Author/Contributor (non-WCU co-authors, if there are any, appear on document)
Jordan Chaires (Creator)
Western Carolina University (WCU )
Web Site:
H. Bora Karayaka

Abstract: While most research on solar energy has been concentrated on smoothing intermittent powerbeing pushed into the power grid, this research is focused on improving the complete integrationof solar energy into the power grid by dispatching, or supplying a constant level of power, for 1-hour time periods. A hybrid energy storage system (HESS), consisting of lead-acid batteries andsupercapacitors, will absorb and supply the necessary levels of power to keep the systems outputpower constant. The demand on the overall HESS and the two components in HESS, lead-acid batteries and supercapacitors, will maintain the constant level of power to dispatch. Thepredicted level of output power, for a one hour dispatching period, is determined by an estimationalgorithm that uses actual solar data from Oak Ridge National Laboratory collected every minutethroughout the day. This research shows results from June 9th, 2015, June 10th, 2015, June 12th,2015, and December 25th, 2015 between 5:00 AM and 7:59 PM [3]. The estimation algorithmincorporates the solar irradiance and temperature to estimate the PV arrays average outputpower and its eciency. The demand on the HESS is sent through a low-pass lter with a timeconstant of 1-minute that is then used as the reference for the lead-acid batteries. The remainingdemand on the HESS is used as the reference for the supercapacitors. This utilizes the lead-acidbatteries high energy density property, or slow charge/discharge rates at high energy levels, andthe supercapacitors high power density property, or rapid charge/discharge rates at low energylevels [1, 4].

Additional Information

Language: English
Date: 2016
Battery Bank, Dispatchable, Intermittent, State of Charge, Supercapacitor Bank, Synergy
Solar energy
Renewable energy sources
Solar concentrators
Solar radiation -- Measurement
Photovoltaic power generation
Photovoltaic power systems

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