Sine-wave inverter capable of parallel operation and parallel operation control method thereof

摘要

PROBLEM TO BE SOLVED: To provide a parallel operating method of sine-wave inverters and the sine-wave inverters permitting parallel operation which is simple in constitution and lower in cost, and in which replacement (it is called hot swap) during parallel operation can be carried out.;SOLUTION: The sine-wave inverter permitting parallel operation includes a control unit having an inverter control circuit that controls a power unit by an output of a voltage comparator which compares an output of a reference sine-wave generator with a detecting circuit of an output voltage. The control unit includes a synchronous common line connected to other sine-wave inverters connected in parallel, a current sharing common line, and a current sharing circuit that adds a detected output of a cross current detector connected to the current sharing common line to the voltage comparator, controls current sharing of a plurality of sine-wave inverters connected in parallel, and permits parallel operation removing a cross current flowing across a plurality of sine-wave inverters connected in parallel.;COPYRIGHT: (C)2004,JPO&NCIPI