Hot standby power supply for a variable frequency drive
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-001/00
H02P-027/04
H02J-004/00
H02J-007/34
H02J-009/04
H02M-001/00
출원번호
US-0153030
(2014-01-11)
등록번호
US-9325272
(2016-04-26)
우선권정보
EP-13151048 (2013-01-11)
발명자
/ 주소
Haugen, Joern Tore
Ohma, Haavar Forsell
출원인 / 주소
Siemens Aktiengesellschaft
대리인 / 주소
Lempia Summerfield Katz LLC
인용정보
피인용 횟수 :
1인용 특허 :
10
초록▼
A hot standby power supply for a variable frequency drive of a floating vessel is provided. The variable frequency drive may power an electric motor of the floating vessel. The hot standby power supply includes a power input for receiving electric power from a main power supply of the floating vesse
A hot standby power supply for a variable frequency drive of a floating vessel is provided. The variable frequency drive may power an electric motor of the floating vessel. The hot standby power supply includes a power input for receiving electric power from a main power supply of the floating vessel. The hot standby power supply also includes a first electric connection configured to supply electric power at a first voltage level to a converter power input of the variable frequency drive, and a second electric connection configured to supply electric power at a second voltage level to control power input of the variable frequency drive. The first voltage level is higher than the second voltage level. A transformer is further provided for transforming received electric power to the first voltage level or to the second voltage level.
대표청구항▼
1. A hot standby power supply for a variable frequency drive of a floating vessel, the variable frequency drive powering an electric motor of the floating vessel, the hot standby power supply comprising: a power input operable for receiving electric power from a main power supply of the floating ves
1. A hot standby power supply for a variable frequency drive of a floating vessel, the variable frequency drive powering an electric motor of the floating vessel, the hot standby power supply comprising: a power input operable for receiving electric power from a main power supply of the floating vessel;a first electric connection configured to supply electric power at a first voltage level to a converter power input of the variable frequency drive;a second electric connection configured to supply electric power at a second voltage level to a control power input of the variable frequency drive, wherein the first voltage level is higher than the second voltage level;a transformer operable for transforming received electric power to the first voltage level or to the second voltage level;an electric power storage unit operable for storing and supplying electric power, the electric power storage unit being electrically connected so as to be operable to supply electric power to both the first electric connection and the second electric connection, the first electric connection or the second electric connection being supplied via the transformer for providing the first voltage level or the second voltage level, respectively; anda control unit configured to control the hot standby power supply such that in operation, electric power received at the power input is provided to the converter power input and to the control power input of the variable frequency drive via the first electric connection and the second electric connection, and that upon an interruption in the supply with electric power from the main power supply, electric power is supplied from the electric power storage unit to the converter power input and to the control power input of the variable frequency drive via the first electric connection and the second electric connection,wherein the control unit is further configured to: terminate the provision of electric power from the electric power storage unit to at least the converter power input of the variable frequency drive after a first amount of time or after a predetermined condition is met; andrestart the provision of electric power from the electric power storage unit to the converter power input of the variable frequency drive upon receiving an indication that the supply with electric power from the main power supply will resume. 2. The hot standby power supply of claim 1, wherein the transformer is a step down transformer configured to provide a voltage conversion from the first voltage level to the second voltage level. 3. The hot standby power supply of claim 1, wherein the transformer is a first transformer, and wherein the hot standby power supply further comprises a second transformer connected to the power input of the hot standby power supply and configured to convert received electric power from a receiving voltage level to the first voltage level or the second voltage level, the electric power storage unit being electrically coupled to a secondary side of the second transformer. 4. The hot standby power supply of claim 1, further comprising a third electric connection to an auxiliaries power input of the variable frequency drive, the auxiliaries power input being electrically coupled to one or more auxiliaries of the variable frequency drive including at least a cooling unit, the hot standby power supply being configured to supply electric power at the first voltage level or the second voltage level to the auxiliaries power input so as to provide electric power to the cooling unit. 5. The hot standby power supply of claim 1, wherein the received electric power is AC electric power, the electric power storage unit comprising a DC electric power storage element and a converter, the converter being configured to convert received AC electric power to DC electric power when charging the storage element and to convert DC electric power supplied by the storage element to AC electric power when the electric power storage unit supplies electric power to the first electric connection and the second electric connection. 6. The hot standby power supply of claim 5, wherein the DC electric power storage element comprises a battery, a capacitor bank, or the battery and the capacitor bank. 7. The hot standby power supply of claim 1, further comprising a communication link towards a controller of the variable frequency drive configured to enable a communication between the control unit of the hot standby power supply and the controller of the variable frequency drive. 8. The hot standby power supply of claim 1, wherein the control unit is configured to restart supplying electric power from the power storage unit to the converter power input of the variable frequency drive upon receiving an indication on a start signal being supplied to a generator of the main power supply. 9. A drive system comprising: a variable frequency drive for powering an electric motor of a floating vessel, the variable frequency drive comprising: a converter having a DC link;a controller configured for controlling the variable frequency drive;a converter power input configured for supplying electric power to the converter to precharge the DC link; anda controller power input configured for supplying electric power to the controller of the variable frequency drive; anda hot standby power supply for the variable frequency drive, the hot standby power supply comprising: a power input operable for receiving electric power from a main power supply of the floating vessel;a first electric connection configured to supply electric power at a first voltage level to a converter power input of the variable frequency drive;a second electric connection configured to supply electric power at a second voltage level to a control power input of the variable frequency drive, wherein the first voltage level is higher than the second voltage level;a transformer operable for transforming received electric power to the first voltage level or to the second voltage level;an electric power storage unit operable for storing and supplying electric power, the electric power storage unit being electrically connected so as to be operable to supply electric power to both the first electric connection and the second electric connection, the first electric connection or the second electric connection being supplied via the transformer for providing the first voltage level or the second voltage level, respectively; anda control unit configured to control the hot standby power supply such that in operation, electric power received at the power input is provided to the converter power input and to the control power input of the variable frequency drive via the first electric connection and the second electric connection, and that upon an interruption in the supply with electric power from the main power supply, electric power is supplied from the electric power storage unit to the converter power input and to the control power input of the variable frequency drive via the first electric connection and the second electric connection,wherein the first electric connection is electrically connected to the converter power input, and the second electric connection is electrically connected to the controller power input, andwherein the control unit is further configured to: terminate the provision of electric power from the electric power storage unit to at least the converter power input of the variable frequency drive after a first amount of time or after a predetermined condition is met; andrestart the provision of electric power from the power storage unit to the converter power input of the variable frequency drive upon receiving an indication that the supply with electric power from the main power supply will resume. 10. The drive system of claim 9, wherein the electric motor is an electric motor of a thruster of the floating vessel. 11. The drive system of claim 9, wherein the drive system is a drive system of a dynamically positioned vessel, and the variable frequency drive is configured to supply electric power to an electric motor of a thruster of the dynamically positioned vessel. 12. The drive system of claim 9, wherein the variable frequency drive comprises a charging transformer connected between the converter power input and the converter. 13. The drive system of claim 9, wherein the variable frequency drive comprises a cooling unit, and the drive system comprises an electric connection between the hot standby power supply and the variable frequency drive enabling the supply of electric power from the electric power storage unit to the cooling unit. 14. The drive system of claim 9, further comprising: a variable frequency drive cabinet, the variable frequency drive being mounted in the variable frequency drive cabinet; anda hot standby power supply cabinet, the hot standby power supply being mounted in the hot standby power supply cabinet, the hot standby power supply cabinet being mounted on a common base frame with the variable frequency drive cabinet. 15. A method for operating a hot standby power supply for supplying electric power to a variable frequency drive, the method comprising: receiving electric power at a power input of the hot standby power supply from a main power supply;providing electric power at a first voltage level to a converter power input of the variable frequency drive via a first electric connection;providing electric power at a second voltage level to a controller power input of the variable frequency drive via a second electric connection, wherein the first voltage level is higher than the second voltage level;transforming, with a transformer, received electric power to the first voltage level or to the second voltage level;providing received electric power to a power storage unit for charging the power storage unit;detecting an interruption in the supply with electric power by the main power supply;supplying electric power from the power storage unit to the converter power input and to the controller power input of the variable frequency drive via the first electric connection and the second electric connection, the first electric connection and the second electric connection being supplied with the electric power via the transformer for providing the respective first voltage level or second voltage level;terminating the supply of the electric power from the power storage unit to at least the converter power input of the variable frequency drive after a first amount of time or after a predetermined condition is met; andrestarting the supply of the electric power from the power storage unit to the converter power input of the variable frequency drive upon receiving an indication that the supply with electric power from the main power supply will resume. 16. The hot standby power supply of claim 1, wherein the predetermined condition comprises expiration of a time period or the electric power storage unit being discharged to a particular level.
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