The input voltage and MPPT range are the most typical values for a 3 kW PV inverter. Other specifications like ac voltage/frequency range, power factor and THD are the mandatory requirements of certification standards. Fig. 2 shows the topology of the power stage of the 3 kW ZVS PV inverter.
As the interface between the renewable energy source and the utility grid, PV inverter is a key component of the distributed PV system. PV inverters with power level below 5 kW usually use single-phase dc-ac topology for residential roof-top applications.
The ZVS-PWM technology is used in this 3kW residential PV inverter. As shown in Fig. 2, the ZVS-PWM technology requires additional resonant circuit including the resonant inductor Lr, resonant capacitor Cr, clamping capacitor Cc and active-clamping switch Sa.
The weighted CEC efficiency is calculated as 98%. The efficiency of a 3kW commercial H6 PV inverter mentioned in Section III is also measured with the same operation voltages, which is lower than the ZVS PV inverter due to higher switching loss and magnetic loss.
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