PURPOSE: To make it possible to suppress cross currents flowing among plurality of inverters surely.
CONSTITUTION: In the case of operating inverters 2c and 3c in parallel, the output currents of the inverters 2c and 3c are detected with current detectors 20 and 21 respectively, and the deviations of the detected values are found by adders 24 and 27 respectively as cross currents ΔI1 and ΔI2. Cross current suppressing signals ΔD1 and ΔD2 for suppressing cross currents ΔI1 and ΔI2 to zero are produced by cross current suppressing circuits 12 and 13. And duty commands D10 and D20 provided on the basis of voltage waveform commands Vrl and Vr2 are corrected with adders 22 and 26 according to the cross current suppressing signals ΔD1 and ΔD2, and the output voltages of the inverters 2C are 3C are controlled according to the corrected duty commands D1 and D2.
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MINO TOMOAKI
INUKAI SATORU
YAMATO IKUO
SAKURAI YOSHIMI
