| 摘要 |
PROBLEM TO BE SOLVED: To allow power converters connected in parallel with each other to continue parallel operation by suppressing cross current even if communication between the power converters stops.SOLUTION: A method detects output current detection values of power converters in two types of load patterns, and on the basis of the output current detection values in the respective load patterns, estimates amplitude difference ΔV1 of output voltage, phase difference Δθ1 of the output voltage among the power converters, and impedance difference R1, X1 between each power converter and a load. On the basis of the amplitude difference ΔV1 of output voltage, the phase difference Δθ1 of the output voltage among power converters, and the impedance difference R1, X1 between each power converter and the load, the method calculates an amplitude command value V1* and a phase command value θ1* of the output voltage of each power converter. The method uses the amplitude command value V1* and the phase command value θ1* to control the amplitude and phase of the output voltage of each power converter.SELECTED DRAWING: Figure 5 |
