About AC line at the lower end of photovoltaic inverter
The first is a DC/DC power stage that converts the variable string output to a stable high-voltage DC link suitable for DC/AC inverter stage. For a single phase power stage, it is typically 400 V and for three phase, around 800 V. This DC/DC stage also works as a Maximum Power Point Tracking (MPPT) converter.
The first is a DC/DC power stage that converts the variable string output to a stable high-voltage DC link suitable for DC/AC inverter stage. For a single phase power stage, it is typically 400 V and for three phase, around 800 V. This DC/DC stage also works as a Maximum Power Point Tracking (MPPT) converter.
These are the galvanic isolation and the number of stages; characteristics generally localized around the DC-AC converter (inverter) at the end of the PV conversion chain.
In utility-interactive PV systems, the inverter becomes the source of current in the AC output circuit to the utility point of connection, and the utility resembles the load. The voltage on the AC output circuit of the inverter will be higher at the inverter terminals and will be lower than the voltage at the utility point of connection.
This DC-link voltage is characterized by double-line frequency ripples, which are natural by-product of single phase AC systems. These ripples, if not controlled properly, can adverse the performances of the grid-tied PV system at the AC side, particularly the grid current THD.
The two-stage PV inverter consists of a front-end DC circuit and a rear-end AC circuit. The whole PV system adopts a hierarchical control strategy and has an independent DC link. The front-end circuit uses the maximum power point tracking (MPPT) of the PV array to control the energy fed to the rear-end stage.
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