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High-Power Solar Inverter Efficiency Measurements by Calorimetric and Electric Methods

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4 Author(s)
Aarniovuori, L. ; Dept. of Electr. Eng., Lappeenranta Univ. of Technol., Lappeenranta, Finland ; Kosonen, A. ; Sillanpää, P. ; Niemelä, M.

In this paper, the results of a European efficiency measurement for a 250-kW high-efficiency grid-connected solar inverter are presented. The efficiency measurements are performed both by electrical input-output and calorimetric methods. Two measurement series with input voltage levels of 500 and 750 VDC are carried out. An open- and balance-type calorimeter system that can measure power losses up to 30 kW is introduced and verified by resistor tests. The measurement results and their uncertainty are analyzed and discussed.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 6 )