To effectively correct the voltage unbalance caused by the unbalance load of specified one or two phases of a three-phase AC distribution line or the unbalance of the system impedance into a given voltage unbalance rate of the wiring line.
A voltage vector *Vvw of the line-to-line between V and W phases being its one interline, being the voltage vector of the line-to-line voltage on the power supply side of a power feeder which is connected to a three-phase AC distribution line and supplies the voltage to adjust other two line-to-line voltages than the reference line-to-line voltage is made the reference vector of a rotation coordinate system. Then, the voltage vector *Vuv between U and V phases being one of other line-to-line voltage is pot in the range of its existence range to keep a given voltage unbalance rate k of the power distribution line. Then, the voltage vector *Vuv of the line-to-line voltage between U and V phases is controlled in a tolerance zone A, with the positive and negative of the deviation between the quantity VA of the scalar of the correction voltage vector *VA and the radius r of the tolerance zone A as the power supply commands of the power feeder, with this vector of voltage to correct the voltage vector *Vuv of the line-to-line voltage between U and W phases, into the center of the tolerance zone A of the circle region in the voltage vector diagram of the rotation coordinate system.
| JP3287957 | AC ARC WELDING MACHINE |
NAKACHI YOSHINORI
WATANABE NAGATAKE
YASUI YOSHINORI
CHUBU ELECTRIC POWER
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