INTERFACE ARRANGEMENT BETWEEN AC AND DC SYSTEMS USING GROUNDING SWITCH
6 Assignments
0 Petitions
Accused Products
Abstract
An interface arrangement for connection between an AC system and a DC system and to a method of disconnecting a DC system from an AC system are disclosed. The arrangement includes a converter for conversion between AC and DC having a DC side for connection to the DC system and an AC side for being coupled to the AC system, a set of circuit breakers coupled between the AC side of the converter and the AC system and a breaker assisting unit including a set of branches connected between the AC side of the converter and ground, where each branch includes a switch in series with an impedance element.
22 Citations
34 Claims
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1-14. -14. (canceled)
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15. An interface arrangement for connection between an AC system and a DC system and comprising:
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a voltage source converter for conversion between AC and DC, said converter having a DC side for connection to said DC system and an AC side for being coupled to said AC system; a set of circuit breakers coupled between the AC side of the converter and the AC system; and a breaker assisting unit comprising a set of branches connected between the AC side of the converter and ground, where each branch includes a switch in series with an impedance element, wherein the circuit breakers are closed and the switches are open in normal operation, and the interface arrangement further comprises a control unit configured to close the switches of the branches upon the occurrence of a fault for ensuring zero-crossings in currents flowing through the circuit breakers and to open the circuit breakers at such zero-crossings. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 29, 30, 31, 32, 33, 34)
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26. A method of disconnecting a DC system from an AC system, said DC system being coupled to the AC system via a voltage source converter for conversion between AC and DC and a set of circuit breakers and to ground via a breaker assisting unit comprising a set of branches, where each branch includes a switch in series with an impedance element, and the circuit breakers are closed and the switches are open in normal operation, the method comprising the steps of:
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obtaining an indication of a fault; closing the switches of the branches based on said indication for ensuring zero-crossings in currents flowing through the circuit breakers; and opening the circuit breakers at such zero-crossings. - View Dependent Claims (27, 28)
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Specification