| 摘要 |
The idle power of a consumer which is supplied from an alternating voltage mains is compensated using a self-commutated power converter, which is connected to the mains on the alternating voltage side, and which has controllable valves, which can be forced off, in a bridge circuit. A constant direct current (Id), which corresponds to the maximum idle power, is fed to the self-commutated power converter (5) on the DC side from a DC source (10). On the DC side, parallel to the power converter valves (A to F), is a DC converter (18), which is driven at a whole number multiple of the mains frequency. The DC converter and the power converter valves are controlled so that a current (i1, i2, i3), with its fundamental at mains frequency, and its phase position relative to the mains alternating voltage practically constant, is generated at the output of the power converter. The compensation device can react very quickly to changes of idle power. This is possible because no change to the impressed direct current (Id) supplied by the DC source (10) is required. <IMAGE> |
