Performance Analysis of Grid-tied Sine-wave Inverters in a Hybrid Power System

Abstract

The inverter performance model provides a new opportunity for accurately monitoring the performance and health of the inverter in real time. Grid-tied inverter monitoring can be accomplished by using a data acquisition system which provides a periodic measurement of dc voltage and power, as well as true ac power. In real time, inverter’s efficiency can be calculated empirically and compared to the inverter efficiency determined using the inverter performance model. Deviations between measured and calculated inverter efficiency would provide direct evidence of inverter malfunction or degradation in performance. It is likely, given experience, that the nature of the deviations would provide the diagnostic information needed to define required inverter maintenance for optimum future performance.

Keywords: Performance model, Grid-tied Inverter monitoring, Data acquisition, Measured and calculated efficiency, Maintenance