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After commissioning, the battery system was instrumented and preliminary testing commenced – cycling with troubleshooting. The system did not come with data storage capability, thus it was necessary to have internet connectivity for data collection. ACEP developed the user interface program for analyzing data from the performance testing, as shown in Fig. 7. The VRB unit has several independent operating states that are automatically controlled through the battery controller’s state logic. Transitions between states occur because of either an external command from the operator or internal parameter changes observed by the battery’s process monitoring sensors. Fig. 7. User interface. Schematic represents the system circuit (L). Remote PC display (R). ACEP performed custom performance and safety testing with full data acquisition and analysis. The data is streamed live via an ftp address to designated access computers. Performance analyses have included: • Cycle life • Discharge rate • Duty cycle • Environmental conditions (temperature). Battery qualification is still an ongoing process that involves investigation of standby losses, capacity, etc. Some testing procedures e.g., accelerated life and storage analysis that typically involve deep cycling, have not been started. Overall, battery system performance specifications based on preliminary testing have shown very little deviation from the manufacturer specifications. ACEP 12-03 | March 2012 Characterization: Performance Testing and Analysis ADVANCED ENERGY STORAGE RESEARCH 11 | A C E PPDF Image | Advanced Battery Storage Systems Testing at ACEP VRB ESS
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