ARCP multi-point converter having variable-potential intermediate-circuit capacitances
First Claim
1. An auxiliary resonant commutated pole (ARCP) converter, comprising:
- converter phases, each of said converter phases, including;
a series circuit containing at least four main switches to be connected electrically in parallel between DC voltage rails including positive and negative DC voltage rails, adjacent ones of said main switches defining junction points therebetween and one of said junction points functioning as an output of a respective converter phase;
load-relief capacitances, one of said load-relief capacitances connected electrically in parallel with each of said main switches;
two intermediate-circuit capacitances of identical magnitude to be disposed between the DC voltage rails, said two intermediate-circuit capacitances connected to each other defining a connection point being a voltage neutral point;
a variable-potential intermediate-circuit capacitance connected to said junction points of said main switches not forming said output and thus form commutation cells in a balanced manner with regard to the positive and negative DC voltage rails, said variable-potential intermediate-circuit capacitance having two capacitance elements having equivalent magnitudes and connected to each other at a junction point defining a further voltage neutral point;
a resonant inductance having a first connection connected to said output of said converter phase and a second connection; and
independently controllable bi-directional auxiliary switches connected to said voltage neutral point and said second connection of said resonant inductance.
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Abstract
An ARCP converter having a series circuit formed of at least four main switches per converter phase, which are connected electrically in parallel between DC voltage rails is described. A capacitance is connected in parallel with each individual main switch. Two intermediate-circuit capacitances are disposed between the DC voltage rails. A voltage neutral point of the capacitances is available for tapping. Junction points of adjacent main switches which do not form the output are connected to one another via variable-potential intermediate-circuit capacitances for forming commutation cells in a balanced manner with regard to the DC voltage rails. Each intermediate-circuit capacitance is formed of two capacitance elements, whose junction points are available as voltage neutral points, with the output of the converter phase connected to a resonant inductance, whose further connection is connected to all the voltage neutral points via a controllable bi-directional auxiliary switch.
40 Citations
3 Claims
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1. An auxiliary resonant commutated pole (ARCP) converter, comprising:
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converter phases, each of said converter phases, including;
a series circuit containing at least four main switches to be connected electrically in parallel between DC voltage rails including positive and negative DC voltage rails, adjacent ones of said main switches defining junction points therebetween and one of said junction points functioning as an output of a respective converter phase;
load-relief capacitances, one of said load-relief capacitances connected electrically in parallel with each of said main switches;
two intermediate-circuit capacitances of identical magnitude to be disposed between the DC voltage rails, said two intermediate-circuit capacitances connected to each other defining a connection point being a voltage neutral point;
a variable-potential intermediate-circuit capacitance connected to said junction points of said main switches not forming said output and thus form commutation cells in a balanced manner with regard to the positive and negative DC voltage rails, said variable-potential intermediate-circuit capacitance having two capacitance elements having equivalent magnitudes and connected to each other at a junction point defining a further voltage neutral point;
a resonant inductance having a first connection connected to said output of said converter phase and a second connection; and
independently controllable bi-directional auxiliary switches connected to said voltage neutral point and said second connection of said resonant inductance.
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2. An auxiliary resonant commutated pole (ARCP) multipoint converter, comprising:
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converter phases, each of said converter phases, including;
a series circuit containing more than four main switches to be connected electrically in parallel between DC voltage rails including a positive and negative DC voltage rail, adjacent ones of said main switches defining junction points therebetween and one of said junction points functioning as an output of a respective converter phase;
load relief capacitances, one of said load-relief capacitances connected electrically in parallel with each of said main switches;
two intermediate-circuit capacitances of identical magnitude to be disposed between the DC voltage rails, said two intermediate-circuit capacitances connected to each other defining a connection point being a voltage neutral point;
variable-potential intermediate-circuit capacitances connected to said junction points of said main switches not forming said output of said converter phase and thus forming commutation cells in a balanced manner with regard to the positive and negative DC voltage rails, each of said variable-potential intermediate-circuit capacitance having two capacitance elements having equivalent magnitudes and connected to each other at a junction point defining a further voltage neutral point;
independently controllable bi-directional auxiliary switches, one of said independently controllable bi-directional auxiliary switches connected to said voltage neutral point of said variable-potential intermediate-circuit capacitances and another of said independently controllable bi-directional auxiliary switches connected to said further voltage neutral point of each of said variable-potential intermediate-circuit capacitances; and
resonant inductances, one of said resonant inductances connected between said output of said converter phase and one of said independently controllable bi-directional auxiliary switches, and another of said resonant inductances connected between each neighboring pair of said independently controllable bi-directional auxiliary switches such that the further voltage neutral point of respectively adjacent commutation cells are connected to one another via said independently controllable bidirectional auxiliary switches and said resonant inductances.
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3. An auxiliary resonant commutated pole (ARCP) converter, comprising:
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converter phases, each of said converter phases, including;
a series circuit containing at least four main switches to be connected electrically in parallel between DC voltage rails including a positive and negative DC voltage rails, adjacent ones of said main switches defining junction points there-between and one of said junction points functioning as an output of a respective converter phase;
load-relief capacitances, one of said load-relief capacitances connected electrically in parallel with each of said main switches;
at least three intermediate-circuit capacitances to be disposed between the DC voltage rails and connected to each other in series defining voltage taps there-between at each connection, said at least three intermediate-circuit capacitances having capacitance values such that said voltage taps have voltage levels in a middle of voltage levels to be set at said output of said converter phase;
variable-potential intermediate-circuit capacitances connected to said junction points of said main switches not forming said output of said converter phase thus forming commutation cells in a balanced manner with regard to the positive and negative DC voltage rails;
independently controllable bi-directional auxiliary switches connected to said voltage taps; and
a resonant inductance having a first terminal connected to said output of said converter phase and a second terminal connected to said independently controllable bi-directional auxiliary switches.
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Specification