| US 9,812,982 B2 | ||
| Method in, apparatus for, and interface arrangement between an alternating current power system and a direct current power system | ||
| Ying Jiang-Häfner, Ludvika (SE) | ||
| Assigned to ABB SCHWEIZ AG, Baden (CH) | ||
| Appl. No. 15/518,626 |
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| Filed by ABB SCHWEIZ AG, Baden (CH) | ||
| PCT Filed Oct. 30, 2014, PCT No. PCT/EP2014/073270 § 371(c)(1), (2) Date Apr. 12, 2017, PCT Pub. No. WO2016/066196, PCT Pub. Date May 6, 2016. |
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| Prior Publication US 2017/0229976 A1, Aug. 10, 2017 | ||
| Int. Cl. H02J 5/00 (2016.01); H02M 7/12 (2006.01); H02M 1/084 (2006.01); H02H 7/125 (2006.01); G05B 15/02 (2006.01); H02H 3/34 (2006.01); H02H 9/02 (2006.01); H02M 7/483 (2007.01) | ||
| CPC H02M 7/12 (2013.01) [G05B 15/02 (2013.01); H02H 7/1255 (2013.01); H02M 1/084 (2013.01); H02H 3/34 (2013.01); H02H 9/02 (2013.01); H02J 5/00 (2013.01); H02M 2007/4835 (2013.01)] | 18 Claims |
| 1. An interface arrangement configured to couple an alternating current, AC, power system with a direct current, DC, power
system, the interface arrangement lacking additional auxiliary equipment and comprising:
at least one converter for conversion of AC power to DC power, wherein the at least one converter comprises a DC side for
coupling of the converter to the DC power system and an AC side for coupling of the converter to the AC power system;
a transformer comprising a primary side for coupling of the transformer to the AC power system and a secondary side for coupling
of the transformer to the at least one converter;
a multi-phase current path comprising a plurality of conductors for coupling the AC power system with the DC power system;
a circuit breaker arranged in a current path between the transformer and the AC power system, the circuit breaker being configured
to controllably effect discontinuation of flow of current in each of the plurality of conductors of the current path upon
opening of contacts of the circuit breaker independently of the other ones of the plurality of conductors;
a fault sensing unit configured to sense a fault occurring in the interface arrangement; and
a control and processing module communicatively coupled to the fault sensing unit,
wherein the control and processing module is configured to control operation of the circuit breaker at least with respect
to opening of the circuit breaker, and wherein the control and processing module is configured to open the contacts of the
circuit breaker if there is determined to be a fault occurring in the interface arrangement, and
wherein the control and processing module is further configured to, if a fault in the interface arrangement as sensed by the
fault sensing unit occurs in a current path in a predefined portion of the interface arrangement for a conductor of the plurality
of conductors, delay opening of the contacts of the circuit breaker by a selected delay time period for the conductor for
which a fault is sensed so as to effect discontinuation of flow of current in the conductor by a selected delay time period
compared to if the fault would have been within a portion of the interface arrangement different from the predefined portion
and without delay for the other conductors, and wherein the fault in the interface arrangement as sensed by the fault sensing
unit is a phase to ground fault and the selected delay time period is between about 20 ms and 100 ms and the delay is implemented
through the control and processing module being configured to send an instruction issued after the detection of the fault
that is delayed by the selected delay time period and the predefined portion of the interface arrangement is a current path
between the secondary side of the transformer and the AC side of the at least one converter.
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