N-point-converter circuit
First Claim
1. An n-point-converter circuit, consisting:
- a maximum of two converter valves for each converter phase electrically connected in series at corresponding valve connection points, each converter valve having a maximum of (n−
1) turn-off semiconductor switches;
a voltage intermediate circuit having a maximum of (n−
1) capacitors electrically connected in series at corresponding capacitor connection points, each capacitor connection point defining a corresponding DC potential; and
a maximum of (n−
2) cross arms, each cross arm having a maximum of (n−
1) semiconductor switches, of which at least two are anti-serially connected, wherein free ends of the series-connected converter valves form DC-side terminals, said DC-side terminals connected electrically in parallel with the voltage intermediate circuit, and wherein the (n−
2) cross arms connect the valve connection point of each series-connected pair of the converter valves with a corresponding one of the intermediate potentials of the voltage intermediate circuit capacitor connection points.
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Accused Products
Abstract
An n-point-converter circuit with two series-connected power converter valves, each having (n−1) turn-off semiconductor switches, is disclosed. The converter circuit has a voltage intermediate circuit with (n−1) electrically series-connected capacitors. The voltage intermediate circuit is connected in parallel to DC-side terminals of the series-connected power converter valves. At least one AC-side terminal can be connected to one or more of the n potentials of the voltage intermediate circuit by means of (n−2) cross arms, each of which includes at least (n−3) turn-off semiconductor switches. The multipoint converter is easy to implement, has an improved output voltage quality, and possesses an emergency running feature.
70 Citations
6 Claims
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1. An n-point-converter circuit, consisting:
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a maximum of two converter valves for each converter phase electrically connected in series at corresponding valve connection points, each converter valve having a maximum of (n−
1) turn-off semiconductor switches;
a voltage intermediate circuit having a maximum of (n−
1) capacitors electrically connected in series at corresponding capacitor connection points, each capacitor connection point defining a corresponding DC potential; and
a maximum of (n−
2) cross arms, each cross arm having a maximum of (n−
1) semiconductor switches, of which at least two are anti-serially connected, wherein free ends of the series-connected converter valves form DC-side terminals, said DC-side terminals connected electrically in parallel with the voltage intermediate circuit, andwherein the (n−
2) cross arms connect the valve connection point of each series-connected pair of the converter valves with a corresponding one of the intermediate potentials of the voltage intermediate circuit capacitor connection points. - View Dependent Claims (2, 3)
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4. An n-point-converter circuit, consisting:
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a maximum of two converter valves for each converter phase electrically connected in series and having free ends forming DC-side terminals, each converter valve having a maximum of (n−
1) turn-off semiconductor switches and a valve connection point;
a voltage intermediate circuit having a maximum of (n−
1) capacitors electrically connected in series at (n−
2) corresponding capacitor connection points and connected electrically in parallel with the DC-side terminals, each capacitor connection point defining a corresponding DC potential; and
a maximum of (n−
2) cross arms having turn-off cross arm semiconductor switches and connecting one of the (n−
2) capacitor connection points with a corresponding one of the valve connection points,wherein a number of the turn-off cross arm semiconductor switches in a cross arm is selected so that each cross arm that connects a valve connection point with a corresponding intermediate potential of the voltage intermediate circuit capacitor connection points has an identical number of turn-off cross arm semiconductor switches, and at least two of the turn-off cross arm semiconductor switches in a cross arm are anti-serially connected. - View Dependent Claims (5, 6)
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Specification