@inproceedings{fregosi_bhattacharya_2013, title={A novel method for control of distributed storage devices in distribution: Ripple voltage injection with frequency droop}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84893185579&partnerID=MN8TOARS}, DOI={10.1109/pesmg.2013.6672278}, abstractNote={Ripple voltage injection has been used to control distributed loads to implement demand response. In this paper, we propose a novel technique to improve ripple control by utilizing frequency droop to control the power flow of distributed storage devices. Droop enables an arbitrary number of distributed devices to communicate bi-directionally to achieve power sharing. The response time of such a system is defined by the control and does not change as the number of storage devices increases. By controlling distributed storage through ripple control, communication systems on the grid are freed to perform other functions. The proposed control technique is explained and design and simulation are presented for the application of controlling electric vehicle chargers on a distribution feeder for frequency support.}, booktitle={IEEE Power and Energy Society General Meeting}, author={Fregosi, D. and Bhattacharya, Subhashish}, year={2013} }
 @inproceedings{fregosi_bhattacharya_atcitty_2011, title={Empirical battery model characterizing a utility-scale carbon-enhanced VRLA battery}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-81855168395&partnerID=MN8TOARS}, DOI={10.1109/ecce.2011.6064248}, abstractNote={In this paper, the electrical characteristics of a carbon enhanced valve-regulated lead-acid (VRLA) battery from East Penn Manufacturing are investigated and a dynamic model is developed for use in electrical simulations. The electrochemical processes that cause specific dynamic behaviors have been investigated. These processes are explained and a non-linear electric model, which captures the results of some of these electrochemical dynamics, is presented. The method to determine model parameters using experimental data is shown. To verify the battery model, both a pulsed current profile and an arbitrary current profile were applied to the battery and to the battery model and the voltage responses of the two were compared.}, booktitle={IEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings}, author={Fregosi, D. and Bhattacharya, Subhashish and Atcitty, S.}, year={2011}, pages={3541–3548} }