Abstract
the inverter is one of the key technologies in PV system. It transforms the DC power output by the PV panel to AC power that the grid needs. The main technologies of the inverter are the circuit topology and the control tactic. The circuit topologies of inverter including the frequency isolated PV grid-connected inverters, the high-frequency isolated PV grid-connected inverter, the single-stage non-isolated PV grid-connect inverter and the multi-level non-isolated PV grid-connected inverter. The control tactics including the voltage oriented control (VOC), the voltage-based direct power control (V-DPC), the virtual-flux oriented control (VFOC) and the virtual-flux based direct power control (VF-DPC).
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