Abstract
The multifunctional operation of photovoltaic (PV) inverters consists in providing ancillary services to the power grid, such as reactive power injection, harmonic current compensation and frequency regulation. However, it is necessary to quantify the effect of those extra activities on the PV inverter life consumption. This work analyzes the life consumption of a single phase multifunctional inverter during harmonic current load compensation. The mission profile of harmonic current, irradiance and temperature are considered by the lifetime model to obtain a more realistic estimation. Therefore, the power losses and thermal stress were evaluated on the semiconductors devices. In addition, rainflow method, Bayerers model and Palmgrem-Miners rules are used in the methodology. The results show that life consumption is correlated to the harmonic order, phase angle and harmonic amplitude. In addition, when the harmonic phase angle is equal to 180°, the life consumption can be lower than a conventional inverter in 9.5%. On the other hand, when the phase angle is 0°, the converter life consumption can increase in 15.2%.
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