POWER CONVERTER
First Claim
1. A power converter comprising:
- first and second DC terminals each configured to transmit and receive DC power, the first DC terminal being connected to a first DC power transmission line, the second DC terminal being connected to a second DC power transmission line; and
a plurality of phase modules connected in parallel between the first and second DC terminals,each of the phase modules includingan AC terminal configured to transmit and receive AC power,a first arm and a circuit breaker connected in series between the first DC terminal and the AC terminal, anda second arm connected between the AC terminal and the second DC terminal,the circuit breaker being configured to be in a conductive state during a normal operation, the circuit breaker being configured to be brought into a non-conductive state when a short circuit accident occurs between the first and second DC power transmission lines,each of the first and second arms including a plurality of unit cells connected in cascade,each of the unit cells including a voltage source, first and second switching elements, and first and second diodes, the first and second switching elements being connected in series between electrodes of the voltage source, the first and second diodes being respectively connected to the first and second switching elements in antiparallel,each of the first and second arms further including at least one bypass switch,the at least one bypass switch being configured to be brought into the conductive state when the short circuit accident occurs, so as to bypass the first or second diode of each unit cell of a corresponding arm,one of the plurality of circuit breakers being a DC circuit breaker configured to interrupt direct current when the short circuit accident occurs, each of the other circuit breakers being an AC circuit breaker configured to interrupt alternating current when the short circuit accident occurs.
1 Assignment
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Accused Products
Abstract
In a multilevel converter, three circuit breakers are respectively connected between three arms and three reactors. One circuit breaker is a DC circuit breaker configured to interrupt direct current when a short circuit accident occurs between two DC power transmission lines. Each of the two circuit breakers is an AC circuit breaker configured to interrupt alternating current when the short circuit accident occurs. When the short circuit accident occurs, the two AC circuit breakers are brought into the non-conductive state and then the DC circuit breaker is brought into the non-conductive state, thereby interrupting the short circuit current.
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Citations
13 Claims
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1. A power converter comprising:
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first and second DC terminals each configured to transmit and receive DC power, the first DC terminal being connected to a first DC power transmission line, the second DC terminal being connected to a second DC power transmission line; and a plurality of phase modules connected in parallel between the first and second DC terminals, each of the phase modules including an AC terminal configured to transmit and receive AC power, a first arm and a circuit breaker connected in series between the first DC terminal and the AC terminal, and a second arm connected between the AC terminal and the second DC terminal, the circuit breaker being configured to be in a conductive state during a normal operation, the circuit breaker being configured to be brought into a non-conductive state when a short circuit accident occurs between the first and second DC power transmission lines, each of the first and second arms including a plurality of unit cells connected in cascade, each of the unit cells including a voltage source, first and second switching elements, and first and second diodes, the first and second switching elements being connected in series between electrodes of the voltage source, the first and second diodes being respectively connected to the first and second switching elements in antiparallel, each of the first and second arms further including at least one bypass switch, the at least one bypass switch being configured to be brought into the conductive state when the short circuit accident occurs, so as to bypass the first or second diode of each unit cell of a corresponding arm, one of the plurality of circuit breakers being a DC circuit breaker configured to interrupt direct current when the short circuit accident occurs, each of the other circuit breakers being an AC circuit breaker configured to interrupt alternating current when the short circuit accident occurs. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9)
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5. A power converter comprising:
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first and second DC terminals each configured to transmit and receive DC power, the first DC terminal being connected to a first DC power transmission line, the second DC terminal being connected to a second DC power transmission line; and a plurality of phase modules connected in parallel between the first and second DC terminals, each of the phase modules including an AC terminal configured to transmit and receive AC power, a first arm and a circuit breaker connected in series between the first DC terminal and the AC terminal, and a second arm connected between the AC terminal and the second DC terminal, the circuit breaker being configured to be in a conductive state during a normal operation, the circuit breaker being configured to be brought into a non-conductive state when a short circuit accident occurs between the first and second DC power transmission lines, each of the first and second arms including a plurality of unit cells connected in cascade, each of the unit cells including a voltage source, first and second switching elements, and first and second diodes, the first and second switching elements being connected in series between electrodes of the voltage source, the first and second diodes being respectively connected to the first and second switching elements in antiparallel, each of the first and second arms further including at least one bypass switch, the at least one bypass switch being configured to be in the non-conductive state during the normal operation, the at least one bypass switch being configured to be brought into the conductive state when the short circuit accident occurs, so as to bypass the first or second diode of each unit cell of a corresponding arm, when the short circuit accident occurs, a circuit breaker having a highest capability to interrupt direct current among the plurality of circuit breakers being finally caused to interrupt. - View Dependent Claims (10, 11, 12, 13)
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Specification