| 摘要 |
PURPOSE:To reduce power loss and make a harmonic filter compact, by providing a power regeneration circuit which has a rectifier, connecting the circuit in series with a DC circuit of converters and regenerating a fundamental wave and harmonics on the DC sides of the converters. CONSTITUTION:A DC reactor 21 is provided in a DC line DC-L which connects converters 14, 15 at one conversion place to those 19, 20 at another conversion place. A filter 22 comprising series circuits of capacitances C and inductances L of bypass filters is connected to the tertiary sides of three-winding transformers 12, 13. A power regeneration circuit 23 is composed of an auxiliary transformer 24, a rectifier 25 and a DC filter 26. The input terminals of the power regeneration circuit are connected to the coupled nodes of the capacitances C and inductances L of the filter 22. The output terminals of the power regeneration circuit 23 are connected in series with the converters 14, 15, 19, 20. This results in reducing power loss and making a filter unit compact as a whole.
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