APPARATUS AND METHOD FOR SUPPLYING HYBRID POWER OF OFFSHORE PLANT

• US 20170040795A1
• Filed: 12/18/2014
• Published: 02/09/2017
• Est. Priority Date: 12/18/2013
• Status: Abandoned Application

• Current Assignee: Daewoo Shipbuilding & Marine Engineering Company Limited (Government of South Korea)
• Original Assignee: Daewoo Shipbuilding & Marine Engineering Company Limited (Government of South Korea)
• Inventors: LEE, Sang Hyun, JUNG, Ho Young
• Application Number:
  US15/106,237
• Publication Number:
  US 20170040795A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: E21B 3/022 Top drives
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 1/106 for load balancing, symmetrisation, or sharing
• CPC Class Codes: H02J 2300/10 The dispersed energy generation being of fossil origin, e.g. diesel generators
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 3/28 Arrangements for balancing of the load in a network by storage of energy
• CPC Class Codes: H02J 3/30 using dynamo-electric machines coupled to flywheels
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 3/04 by static converters
• CPC Class Codes: H02P 3/18 for stopping or slowing an ac motor
• CPC Class Codes: Y02E 60/16 Mechanical energy storage, e.g. flywheels or pressurised fluids
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A power supply apparatus of an offshore plant comprises: an AC/DC converter converting alternating current produced from a generator into direct current and supplying the direct current to a DC bus; a power load connected to the DC bus so as to regenerate power; a first DC/DC converter connected to the DC bus; a second DC/DC converter connected to the DC bus; a first power storage unit connected to the first DC/DC converter and storing power when a voltage of the DC bus is maintained at a level of a first threshold value or higher for a first time period; and a first resistance unit connected to the second DC/DC converter and consuming power when the voltage of the DC bus is maintained at the level of the first threshold value or higher for a second time period. The second time period is longer than the first time period.

Claims

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 second DC/DC converter connected to the DC bus;

a first power storage unit connected to the first DC/DC converter and storing electric power when a voltage of the DC bus is maintained at a first threshold value or higher for a first period of time; and

a first resistor connected to the second DC/DC converter and consuming 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 second period of time is longer than the first period of time.

2. The hybrid power supply apparatus according to claim 1, wherein the first DC/DC converter measures the voltage of the DC bus, and allows electric power to be supplied 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.

3. The hybrid power supply apparatus according to claim 1, wherein the second DC/DC converter allows electric power to be suppled from the DC bus to the first resistor such that the first 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.

4. The hybrid power supply apparatus according to claim 1, further comprising:

a third DC/DC converter connected to the DC bus;

a fourth DC/DC converter connected to the DC bus;

a second power storage unit connected to the third DC/DC converter and storing electric power when the voltage of the DC bus is maintained at the first threshold value or higher for the first period of time; and

a second resistor connected to the fourth DC/DC converter and consuming electric power when the voltage of the DC bus is maintained at the first threshold value or higher for the second period of time.

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

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

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

8. A hybrid power supply method for an offshore plant, comprising:

measuring voltage of a DC bus;

storing, by a power storage unit, electric power when the measured voltage is maintained at a first threshold value or higher for a first period of time; and

consuming, by a resistor, electric power when the measured voltage is maintained at the first threshold value or higher for a second period of time,

wherein the DC bus is connected to an electric power load generating regenerative power and the second period of time is longer than the first period of time.

9. The hybrid power supply method according to claim 8, wherein the DC bus is connected to a first DC/DC converter and a second DC/DC converter, the power storage unit is connected to the first DC/DC converter, and the resistor is connected to the second DC/DC converter.

10. The hybrid power supply method according to claim 9, wherein the first DC/DC converter measures the voltage of the DC bus, and allows electric power to be supplied 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 9, wherein the second DC/DC converter allows electric power to be suppled from the DC bus to the first resistor such that the first 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. The hybrid power supply method according to claim 8, wherein the power storage unit is an ultracapacitor.

13. The hybrid power supply method according to claim 8, wherein the electric power load is a draw-works.

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