GRID-CONNECTED THREE-PHASE INVERTER

摘要

PROBLEM TO BE SOLVED: To provide a grid-connected three-phase inverter having a function of controlling phases among respective phases during a period until parallel off from generation of a single operation state.;SOLUTION: Instead of reflecting fluctuation of a phase angle of respective phases in an AC terminal directly to an electric control angle, a grid-connected three-phase inverter reflects a value obtained after performing constant value variable arithmetic processing to the electric control angle to perform control of the phase angles of a three-phase inverter. A phase change rate between respective phases are made possible to be kept constant, current unbalance during phase transition of three-phase AC and during transition between unbalanced and balanced can be suppressed, and state transition is made possible by suppressing excess current.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT