| 摘要 |
The main object of the invention is to minimize harmonics in the output voltage of the parallel-connection multiple inverter. The object of the invention is accomplished in conjunction with a parallel-connection multiple inverter system which includes at least two inverters for converting DC voltage into AC voltage and which outputs a synthetic output voltage synthesizing AC voltages from these inverters, and a control method for controlling said parallel-connection multiple inverter system, in which individual output voltages of the at least two inverters are controlled on the basis of the pulse width modulation signals obtained through comparison between a respective AC voltage command signal serving as a reference value for individual line phases of the output line-to-line voltage and two carrier waves of an individual line phase thereof each having a phase difference of 180 degrees, and wherein the phase angle of the carrier waves of one of the corresponding individual line phases is caused to change 90 degrees every time the polarity of the AC voltage command of individual line phases changes, more specifically, at every 180 degrees of cyclic period. <IMAGE> |
