Loss Analysis of a 100kW PV Inverter

This paper deals with the power loss of a photovoltaic inverter system. The research aims at revealing the loss mechanism of different parts and developing corresponding mathematical calculation methods of the loss. In the first part the structure of a commonly used three-phase grid-connected PV inverter is introduced. The possible losses in this system come from the IGBTs, diodes, capacitor on the DC side, LCL filter, control circuit, cooling system, etc. In the following parts, the losses of each part are analyzed and calculated. Finally, the validity of the proposed calculation methodology is assessed by comparing the theoretical and experimental results.