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Arcp converter and a method for control thereof

  • US 20040246756A1
  • Filed: 03/16/2004
  • Published: 12/09/2004
  • Est. Priority Date: 09/21/2001
  • Status: Abandoned Application
First Claim
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1. A converter comprising:

  • a series connection of at least two current valves (2, 3) arranged between two poles (4, 5), a positive and a negative, of a direct voltage side of the converter, each of which current valves comprising a semiconductor element (13a, 13b) of turn-off type and a rectifying member (14) connected in anti-parallel therewith, an alternating voltage phase line (11) being connected to a midpoint (10), denominated phase output, of the series connection between two current valves while dividing the series connection into two equal parts, a series connection of at least two intermediate link capacitors (7, 8) arranged between the two poles (4, 5) of the direct voltage side of the converter, a resonant circuit (16) comprising a series connection of an inductor (17) and an auxiliary valve (18) arranged between the phase output (10) and a midpoint (9) of said series connection of intermediate link capacitors (7, 8), which auxiliary valve (18) comprises at least one set (22) of two series connected auxiliary valve circuits (19), each of which comprising a semiconductor component (20a;

    20b) of turn-off type and a rectifying component (21a;

    21b) connected in anti-parallel therewith, the semiconductor components (20a, 20b) of turn-off type of the two auxiliary valve circuits being arranged in opposite polarity in relation to each other, the resonant circuit further comprising capacitive members (15), each of which being connected in series with said inductor (17) and auxiliary valve (18) and in parallel with one of said current valves (2, 3), and a control device (24) for controlling the turn-on and turn-off of the semiconductor elements (13a, 13b) of turn-off type of the current valves and the semiconductor components (20a, 20b) of turn-off type of the auxiliary valve, characterized in that wherein the resonant circuit comprises means (31) for detecting a zero current condition in the auxiliary valve, which means (31) is adapted to send to the control device (24) signals indicating a prevailing zero current condition in the auxiliary valve, the control device (24) being adapted to admit a turn-off of a semiconductor component (20a, 20b) of turn-off type of the auxiliary valve only after the receipt by the control device (24) of a signal indicating a prevailing zero current condition in the auxiliary valve, and that said means (31) for detecting a zero current condition in the auxiliary valve comprises one or several members (23) for detecting a blocking voltage of the rectifying components (21a, 21b) of the auxiliary valve.

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