Pcamerica license message6/1/2023 PVUSA has made significant progress in understanding the requirements for PCUs in grid-connected PV applications and improving field performance. The inability to completely test PCUs at the factory resulted in difficulty during startup, field more ยป testing, and subsequent operation. Factory tests were useful but limited by the inability to test under full power and changing power conditions. Although a number of manufacturers can provide PCUs in this power range, none of these PCUs have been produced in sufficient quantity to allow refinement of a particular model into the highly reliable unit needed for long-term, unattended operation. PVUSA required PCUs in the power range 25 kW to 500 kW which could operate automatically and reliably under changing conditions of sunlight and changing conditions on the utility grid. This report describes the design, testing, performance characteristics, and maintenance history of each of these PCUs. There are five different models of PCUs at PVUSA`s Davis and Kerman sites. Power conditioning units (PCUs) are the interface between the dc PV arrays and the ac utility lines, and have proved to be the most critical element in grid-connected PV systems. One of PVUSA`s key objectives is to evaluate the performance, reliability, and cost of the PV balance of system (BOS). The Photovoltaics for Utility Scale Application (PVUSA) project was established to demonstrate photovoltaic (PV) systems in grid-connected utility applications.
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