Design of 3kw photovoltaic inverter

What are the specifications of a 3 kW PV inverter?

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.

What is a 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.

What is the weighted CEC efficiency of a 3KW PV inverter?

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.

Which resonant circuit is used in a 3KW residential PV inverter?

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.

What is cm filter in a 3KW commercial PV inverter?

The CM filter is modified from the design of a 3kW commercial PV inverter with H6 topology. Even though the H6 topology has constant dc CM voltage, CM filters are still needed to suppress to leakage current caused by the switching transient and fulfill the EMI requirement.

How does a 30 kW PV system work?

The system schematic of the 30 kW PV system is shown in Fig. 25. Ten ZVS PV inverters are distributed into three groups and connected to the three-phase 230V grid respectively. The neutral line is connected to earth through a ground stick near the distribution room.