| 摘要 |
PURPOSE: To provide a reactive power compensation effect even when a system linkage three-phase transformer employs different connection system for the primary and secondary windings in the self-exciting reactive power compensation device (SVC). CONSTITUTION: A load current IL of a three-phase three-wire system bus 2 is detected and a compensation object current ICREF of a reactive power component of the current is obtained by a compensation current arithmetic block, and the compensation object current ICREF is given to a phase conversion block, in which matrix arithmetic operation processing is conducted based on a connection system of a primary winding 6a and a secondary winding 6d of a transformer 6 and the ratio N of the number of turns to obtain an inverter output current command value IIREF. The inverter output current command value IIREF is used to control an inverter 5 to supply an inverter output current II to the secondary winding of the transformer 6, then a primary compensation current IC satisfies a relation of IC=-(compensation object component in load current IL) to compensate the reactive power of the system bus 2. |
