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A control system for improved battery utilization in a PV-powered peak-shaving system

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3 Author(s)
Palomino, E. ; Salt River Project, Phoenix, AZ, USA ; Stevens, J. ; Wiles, J.

Photovoltaic (PV) power systems offer the prospect of allowing a utility company to meet part of the daily peak system load using a renewable resource. Unfortunately, some utilities have peak system-load periods that do not match the peak production hours of a PV system. Adding a battery energy storage system to a grid-connected PV power system will allow dispatching the stored solar energy to the grid at the desired times. Batteries, however, pose system limitations in terms of energy efficiency, maintenance, and cycle life. A new control system has been developed, based on available PV equipment and a data acquisition system, that seeks to minimize the limitations imposed by the battery system while maximizing the use of PV energy. Maintenance requirements for the flooded batteries are reduced, cycle life is maximized, and the battery is operated over an efficient range of states of charge. This paper presents design details and initial performance results on one of the first installed control systems of this type

Published in:

Photovoltaic Specialists Conference, 1996., Conference Record of the Twenty Fifth IEEE

Date of Conference:

13-17 May 1996