Apparatus and method for supplying hybrid power in marine plant

Patent metadata

Field	Value
Publication number	US-2016308362-A1
Application number	US-201415106257-A
Country	US
Kind code	A1
Filing date	Dec 18, 2014
Priority date	Dec 18, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

The present invention relates to an apparatus and method for supplying hybrid power using a regenerative power generated in a marine plant. An embodiment of the present invention provides a hybrid power supply apparatus in a marine plant, the hybrid power supply apparatus comprising: a generator; an AC/DC converter which converts an alternating current produced by the generator into a direct current and supplies the direct current to a DC bus; a power load which is connected to the DC bus and generates a regenerative power; a first DC/DC converter which is connected to the DC bus; a first power storage unit which is connected to the first DC/DC converter and stores power; and a first resistor unit which is connected to the first DC/DC converter and consumes power when the first power storage unit's capacity is full.

First claim

1 . A hybrid power supply apparatus for an offshore plant, comprising:
a power generator; an AC/DC converter converting alternating current produced by the power generator into direct current and supplying the direct current to a DC bus; an electric power load connected to the DC bus and generating regenerative power; a first DC/DC converter connected to the DC bus; a first power storage unit connected to the first DC/DC converter and storing electric power; and a first resistor connected to the first DC/DC converter and consuming electric power when the first power storage unit is full.

2 . The hybrid power supply apparatus according to claim 1 , wherein the first DC/DC converter measures voltage of the DC bus, and allows the first power storage unit to store electric power when the voltage of the DC bus is maintained at a first threshold value or higher for a first period of time.

3 . The hybrid power supply apparatus according to claim 2 , wherein the first DC/DC converter measures the voltage of the DC bus, and allows the first resistor to consume electric power when the voltage of the DC bus is maintained at the first threshold value or higher for a second period of time, and wherein the second period of time is longer than the first period of time.

4 . The hybrid power supply apparatus according to claim 2 , further comprising: a second power storage unit and a second resistor.

5 . The hybrid power supply apparatus according to claim 4 , wherein the DC bus is connected to a second DC/DC converter, and the second power storage unit and the second resistor are connected to the second DC/DC converter.

6 . The hybrid power supply apparatus according to claim 1 , wherein the first power storage unit is an ultracapacitor.

7 . The hybrid power supply apparatus according to claim 1 , wherein the electric power load is a draw-works.

8 . The hybrid power supply apparatus according to claim 1 , wherein the electric power load is a top drive.

9 . A hybrid power supply method for an offshore plant, comprising:
measuring, by a DC/DC converter, voltage of a DC bus; storing, by a first power storage unit, electric power when the voltage of the DC bus is maintained at a first threshold value or higher for a first period of time; and consuming, by a resistor, electric power when the voltage of the DC bus is maintained at the first threshold value or higher for a second period of time, wherein the DC bus is connected to a first electric power load generating regenerative power and the second period of time is longer than the first period of time.

10 . The hybrid power supply method according to claim 9 , wherein the DC/DC converter measures the voltage of the DC bus, and allows electric power to flow from the DC bus to the first power storage unit such that the first power storage unit stores electric power, when the voltage of the DC bus is maintained at the first threshold value or higher for the first period of time.

11 . The hybrid power supply method according to claim 10 , wherein the DC/DC converter measures the voltage of the DC bus, and allows electric power to flow from the DC bus to the resistor such that the resistor consumes electric power when the voltage of the DC bus is maintained at the first threshold value or higher for the second period of time.

12 - 16 . (canceled)

17 . The hybrid power supply apparatus according to claim 1 , further comprising a first DC/AC converter connecting the electric power load with the DC bus, wherein the first DC/AC converter detects whether regenerative power is generated in the electric power load, and sends a control signal to the first DC/DC converter when regenerative power is generated in the electric power load, and the first DC/DC converter allows electric power to be supplied from the DC bus to the first power storage unit in response to the control signal such that the first power storage unit stores electric power.

18 . The hybrid power supply apparatus according to claim 17 , wherein the first DC/DC converter allows electric power to be supplied from the DC bus to the first resistor such that the first resistor consumes electric power when detecting that the first power storage unit is full.

19 - 22 . (canceled)

23 . The hybrid power supply method according to claim 9 , further comprising:
detecting, by a first DC/AC converter, whether regenerative power is generated in the first electric power load; storing, by the first power storage unit, regenerative power generated in the first electric power load; detecting, by a second DC/AC converter, whether regenerative power is generated in a second electric power load; and storing, by a second power storage unit, regenerative power generated in the second electric power load; wherein the first DC/AC converter and the second DC/AC converter are connected to a DC bus, the first electric power load is connected to the first DC/AC converter, and the second electric power load is connected to the second DC/AC converter.

24 - 30 . (canceled)

Assignees

• Daewoo Shipbuilding & Marine

Inventors

• Jung Ho Young
• Shin Dong Jae

Classifications

• H02J1/106

  for load balancing, symmetrisation, or sharing · CPC title

• H02J1/102

  being switching converters (H02J1/108, H02J1/12 take precedence) · CPC title

• H02P3/14 Primary

  by regenerative braking · CPC title

• H02M3/04

  by static converters · CPC title

• Y02E60/60

  Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD] · CPC title