Fault-tolerant power distribution systems for a modular power plant

• US 9,866,063 B2
• Filed: 04/05/2016
• Issued: 01/09/2018
• Est. Priority Date: 04/05/2016
• Status: Active Grant

• Current Assignee: NuScale Power, LLC. (Fluor Enterprises, Inc.)
• Original Assignee: NuScale Power, LLC. (Fluor Enterprises, Inc.)
• Inventors: Hough, Ted
• Primary Examiner(s): HOUSTON, ADAM D
• Application Number:
  US15/091,408
• Publication Number:
  US 20170288453A1
• Time in Patent Office: 644 Days
• Field of Search: 307 65, 703 18
• CPC Class Codes: H02B 13/005 Electrical connection between switchgear cells
• CPC Class Codes: H02J 11/00 Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
• CPC Class Codes: H02J 2310/18 The network being internal to a power source or plant
• CPC Class Codes: H02J 3/0073 for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Abstract

Fault-tolerant power distribution systems for modular power plants are discussed. The systems enable the transmission of a portion of the power generated by a modular power plant to remote consumers. The systems also enable the local distribution of another portion of the generated power within the power plant. The various fault-tolerant systems enable the plant to continuously, and without degradation or disruption, transmit power to remote consumers and distribute power within in the power plant in the event of one or more faults within the distribution system. The various embodiments include redundant power-transmission paths, power-distribution module feeds, switchgear, and other hardware components. Such redundant transmission paths and hardware enable the systems to continuously, and without degradation or disruption, transmit power to remote consumers and locally distribute power to the power plant when one or more faults occur within one or more of the redundant power-transmission paths and/or hardware components.

Claims

1. A fault-tolerant power distribution system for locally distributing electrical power generated in a power plant to the power plant, wherein the power plant includes a thermal source that produces thermal energy, the system comprising:

a first generator that converts a portion of the thermal energy produced by the thermal source into a first power signal;

a first feed and a second feed for a first distribution module that corresponds to the first generator;

a first transmission path that when coupled to the first generator, transmits a first portion of the first power signal to the first feed, wherein the first feed provides the first portion of the first power signal to the first distribution module and the first distribution module distributes electrical energy included in the first portion of the first power signal to the power plant;

a first switch that selectively couples and decouples the first transmission path to the first generator;

a second transmission path that when coupled to the first generator, transmits the first portion of the first power signal to the second feed, wherein the second feed provides the first portion of the first power signal to the first distribution module; and

a second switch that selectively couples and decouples the second transmission path to the first generator.

2. The system of claim 1, further comprising:

a first switchgear module that includes the first switch and a first switchgear module bus that includes a first portion of the first transmission path, wherein when the first switch couples the first transmission path to the first generator, the first generator is coupled to at least a portion of the first switchgear module bus; and

a second switchgear module that includes a second switchgear module bus that includes a first portion of the second transmission path, wherein when the second switch couples the second transmission path to the first generator, the first generator is coupled to at least a portion of the second switchgear module bus.

3. The system of claim 2, further comprising:

a third switchgear module that includes a second portion of the first transmission path, wherein the first feed is coupled to an output of the third switchgear module;

a first unit auxiliary transformer (UAT) that is included in the first transmission path intermediate the first and the second portions of the first transmission path, wherein when the first transmission path is coupled to the first generator, the first UAT transforms a voltage of the first portion of the first power signal from a first voltage level to a second voltage level;

a fourth switchgear module that includes a second portion of the second transmission path, wherein the second feed is coupled to an output of the fourth switchgear module; and

a second UAT that is included in the second transmission path intermediate the first and the second portions of the second transmission path, wherein when the second transmission path is coupled to the first generator, the second UAT transforms the voltage of the first portion of the first power signal from the first voltage level to the second voltage level.

4. The system of claim 2, further comprising:

a first main power transformer (MPT);

a third switch that selectively couples and decouples the first MPT to the first switchgear module bus such that when the first transmission path is coupled to the first generator and the first MPT is coupled to the first switchgear module bus, a second portion of the first power signal is transmitted to the first MPT and the first MPT transforms a voltage of the second portion of the first power signal from a first voltage level to a second voltage level;

a second MPT; and

a fourth switch that selectively couples and decouples the second MPT to the second switchgear module bus such that when the second transmission path is coupled to the first generator and the second MPT is coupled to the second switchgear module bus, the second portion of the first power signal is transmitted to the second MPT and the second MPT transforms a voltage of the second portion of the first power signal from the first voltage level to the second voltage level.

5. The system of claim 1, wherein the power plant further includes a second thermal source that produces thermal energy, the system further comprising:

a second generator that converts a portion of the thermal energy produced by the second thermal source assembly into a second electrical power signal;

a first and a second feed for a second distribution module that corresponds to the second generator;

a third transmission path that when coupled to the second generator, transmits a first portion of the second power signal to the third feed, wherein the third feed provides the first portion of the second power signal to the second distribution module and the second distribution module distributes electrical energy included in the first portion of the second power signal to the power plant;

a third switch that selectively couples and decouples the third transmission path to the second generator;

a fourth transmission path that when coupled to the second generator, transmits the first portion of the second power signal to the fourth feed, wherein the fourth feed provides the first portion of the second power signal to the second distribution module; and

a fourth switch that selectively couples and decouples the fourth transmission path to the second generator.

6. The system of claim 5, further comprising:

a first switchgear module that includes a first switchgear module bus that includes a first portion of the first transmission path and a first portion of the fourth transmission path, wherein when the first switch couples the first transmission path to the first generator, the first generator is coupled to at least a portion of the first switchgear module bus and when the fourth switch couples the fourth transmission path to the second generator, the second generator is coupled to the portion of the first switchgear module bus; and

a second switchgear module that includes a second switchgear module bus that includes a first portion of the third transmission path and a first portion of the second transmission path, wherein when the second switch couples the second transmission path to the first generator, the first generator is coupled to at least a portion of the second switchgear module bus and when the third switch couples the third transmission path to the second generator, the second generator is coupled to the portion of the second switchgear module bus.

7. The system of claim 6, further comprising:

a third switchgear module that includes a third switchgear module bus that includes a second portion of the first transmission path that is coupled to the first feed and a second portion of the fourth transmission path that is coupled to the fourth feed, wherein when the first switch couples the first transmission path to the first generator, the first generator is coupled to at least a portion of the third switchgear module bus and when the fourth switch couples the fourth transmission path to the second generator, the second generator is coupled to the portion of the third switchgear module bus; and

a fourth switchgear module that includes a fourth switchgear module bus that includes a second portion of the third transmission path that is coupled to the second feed and a second portion of the third transmission path that is coupled to the third feed, wherein when the second switch couples the second transmission path to the first generator, the first generator is coupled to at least a portion of the fourth switchgear module bus and when the third switch couples the third transmission path to the second generator, the second generator is coupled to the portion of the fourth switchgear module bus.

8. A fault-tolerant power distribution system for locally distributing electrical power generated in a power plant to the power plant, the system comprising:

a first turbine that generates a first power signal;

a second turbine that generates a second power signal;

a first switchgear module that when coupled to the first turbine, transmits the first power signal and when coupled to the second turbine, transmits the second power signal;

a second switchgear module that when coupled to the first turbine, transmits the first power signal and when coupled to the second turbine, transmits the second power signal;

a first switch that when in a first state, couples the first turbine to the first switchgear module and when in a second state, decouples the first turbine from the first switchgear module;

a second switch that when in a first state, couples the first turbine to the second switchgear module and when in a second state, decouples the first turbine from the second switchgear module;

a third switch that when in a first state, couples the second turbine to the second switchgear module and when in a second state, decouples the second turbine from the second switchgear module;

a fourth switch that when in a first state, couples the second turbine to the first switchgear module and when in a second state, decouples the second turbine from the first switchgear module;

a first feed for a first distribution module, wherein the first feed is selectively coupled to the first switchgear module, wherein when coupled to the first switchgear module and the first switchgear module transmits the first power signal, the first feed provides the first power signal to the first distribution module and the first power distribution module distributes a portion of the first power signal to the power plant;

a second feed for the first distribution module, wherein the second feed is selectively coupled to the second switchgear module, wherein when coupled to the second switchgear module and the second switchgear module transmits the first power signal, the second feed provides the first power signal to the first distribution module and the first distribution module distributes the portion of the first power signal to the power plant;

a third feed for a second distribution module, wherein the third feed is selectively coupled to the second switchgear module, wherein when coupled to the second switchgear module and the second switchgear module transmits the second power signal, the third feed provides the second power signal to the second distribution module and the second distribution module distributes a portion of the second power signal to the power plant; and

a fourth feed for the second distribution module, wherein the fourth feed is selectively coupled to the first switchgear module, wherein when coupled to the first switchgear module and the second switchgear module transmits the second power signal, the fourth feed provides the second power signal to the second distribution module and the second distribution module distributes the portion of the second power signal to the power plant.

9. The system of claim 8, wherein the first switchgear module includes the first switch and the second switchgear module includes the third switch.

10. The system of claim 8, wherein the first switchgear module includes the fourth switch and the second switchgear module includes the second switch.

11. The system of claim 8, further comprising:

a fifth switch that when in a first state, couples the first switchgear module to the first and the fourth feeds and when in a second state, decouples the first switchgear module from the first and the fourth feeds;

a sixth switch that when in a first state, couples the second switchgear module to the second and the third feeds and when in a second state, decouples the second switchgear module from the second and the third feeds.

12. The system of claim 8, further comprising:

a third switchgear module that when coupled to the first turbine, transmits the portion of the first power signal from the first switchgear module to the first feed and when coupled to the second turbine, transmits the portion of the second power signal from the first switchgear module to the fourth feed; and

a fourth switchgear module that when coupled to the first turbine, transmits the portion of the first power signal from the second switchgear module to the second feed and when coupled to the second turbine, transmits the portion of the second power signal from the second switchgear module to the third feed.

13. The system of claim 12, further comprising:

a first unit auxiliary transformer (UAT) that when the third switchgear module is coupled to the first turbine, transforms a voltage of the portion of the first power signal that is transmitted to the first power-distribution module, and

wherein when the third switchgear module is coupled to the second turbine, the first UAT transforms a voltage of the portion of the second power signal that is transmitted to the fourth power-distribution module; and

a second UAT that when the fourth switchgear module is coupled to the first turbine, transforms the voltage of the portion of the first power signal that is transmitted to the second power-distribution module, and

wherein when the fourth switchgear module is coupled to the second turbine, the second UAT transforms the voltage of the portion of the second power signal that is transmitted to the third power-distribution module.

14. The system of claim 8, further comprising:

a fifth switch that when in a first state, couples the first switchgear module to a switchyard that is external to the system and when in a second state, decouples the first switchgear module form the switchyard such that when each of the first and the fifth switches are in the first state, another portion of the first power signal is transmitted from the first switchgear module to the switchyard and when each of the fourth and the fifth switches are in the first state, another portion of the second power signal is transmitted from the first switchgear module to the switchyard; and

a sixth switch that when in a first state, couples the second switchgear module to the switchyard and when in a second state, decouples the second switchgear module form the switchyard such that when each of the second and the sixth switches are in the first state, the other portion of the first power signal is transmitted from the second switchgear module to the switchyard and when each of the third and the sixth switches are in the first state, the other portion of the second power signal is transmitted from the second switchgear module to the switchyard.

15. A fault-tolerant power distribution system for locally distributing electrical power generated in a power plant that includes a first generator that generates a first power signal, a second generator that generators a second power signal, and a third generator that generates a third power signal, the system comprising:

a first front-end module that selectively transmits at least a portion of each of a first, the second, and the third power signals from an input of the first front-end module to an output of the first front-end module;

a second front-end module that selectively transmits the portion of the second power signal from an input of the second front-end module to an output of the second front-end module;

a third front-end module that selectively transmits the portion of each of the first and the third power signals from an input of the third front-end module to an output of the third front-end module;

a backend bus that is coupled to the outputs of each of the first, the second, and the third front-end modules and to an input of each of a first feed and a second feed for a first distribution module that corresponds to the first generator, a first feed and a second feed for a second distribution module that corresponds to the second generator, and a first feed and a second feed for a third distribution module that corresponds to the third generator, such that

when the first front-end module is selected to transmit the portion of the first power signal, the backend bus transmits the portion of the first power signal to the first feed for the first distribution module,

when the third front-end module is selected to transmit the portion of the first power signal, the backend bus transmits the portion of the first power signal to the second feed for the first distribution module,

when the second front-end module is selected to transmit the portion of the second power signal, the backend bus transmits the portion of the second power signal to the first feed for the second distribution module,

when the first front-end module is selected to transmit the portion of the second power signal, the backend bus transmits the portion of the second power signal to the second feed for the second distribution module,

when the third front-end module is selected to transmit the portion of the third power signal, the backend bus transmits the portion of the third power signal to the first feed for the third distribution module, and

when the first front-end module is selected to transmit the portion of the third power signal, the backend bus transmits the portion of the third power signal to the second feed for the third distribution module.

16. The system of claim 15, further comprising:

a first backend module that includes a first portion of the backend bus that is coupled to the first feed for the first distribution module, the second feed for the second distribution module, and the second feed for the third distribution module;

a second backend module that includes a second portion of the backend bus that is coupled to the first feed for the second distribution module; and

a third backend module that includes a third portion of the backend bus that is coupled to the second feed for the first distribution module and the first feed for the third distribution module.

17. The system of claim 16, further comprising:

a first cable bus module that electrically couples the first portion of the backend bus included in the first backend module to the second portion of the backend bus included in the second backend module;

a second cable bus module that electrically couples the second portion of the backend bus included in the second backend module to the third portion of the backend bus included in the third backend module; and

a third cable bus module that electrically couples the third portion of the backend bus included in the third backend module to the first portion of the backend bus included in the first backend module.

18. The system of claim 15, further comprising:

a first unit auxiliary transformer (UAT) that is electrically coupled to the output of the first front-end module and the backend bus;

a second UAT that is electrically coupled to the output of the second front-end module and the backend bus; and

a third UAT that is electrically coupled to the output of the third front-end module and the backend bus such that

when the first front-end module is selected to transmit the portion of the first power signal, the first UAT transforms a voltage of the portion of the first power signal that is transmitted to the first feed for the first distribution module,

when the third front-end module is selected to transmit the portion of the first power signal, the third UAT transforms the voltage of the portion of the first power signal that is transmitted to the second feed for the first distribution module,

when the second front-end module is selected to transmit the portion of the second power signal, the second UAT transforms a voltage of the portion of the second power signal that is transmitted to the first feed for the second distribution module,

when the first front-end module is selected to transmit the portion of the second power signal, the first UAT transforms the voltage of the portion of the second power signal that is transmitted to the second feed for the second distribution module,

when the third front-end module is selected to transmit the portion of the third power signal, the third UAT transforms a voltage of the portion of the third power signal that is transmitted to the first feed for the third distribution module, and

when the first front-end module is selected to transmit the portion of the third power signal, the first UAT transforms the voltage of the portion of the third power signal that is transmitted to the second feed for the third distribution module.

19. The system of claim 15, wherein:

the first front-end module includes a first switch, a second switch, a third switch, and a fourth switch that are each enabled with an open state and a closed state;

the second front-end module includes a fifth switch and a sixth switch that are each enabled with an open state and a closed state; and

the third front-end module includes a seventh switch, and eighth switch, and a ninth switch that are each enabled with an open state and a closed state such that

when each the first and the fourth switches are in the closed state and the eighth switch is in the open state, the backend bus transmits the portion of the first power signal to the first feed for the first distribution module,

when each the eighth and the ninth switches are in the closed state and the first switch is in the open state, the backend bus transmits the portion of the first power signal to the second feed for the first distribution module,

when each the fifth and the sixth switches are in the closed state and the second switch is in the open state, the backend bus transmits the portion of the second power signal to the first feed for the second distribution module,

when each the second and the fourth switches are in the closed state and the fifth switch is in the open state, the backend bus transmits the portion of the second power signal to the second feed for the second distribution module,

when each the seventh and the ninth switches are in the closed state and the third switch is in the open state, the backend bus transmits the portion of the third power signal to the first feed for the third distribution module, and

when each the third and the fourth switches are in the closed state and the seventh switch is in the open state, the backend bus transmits the portion of the third power signal to the second feed for the third distribution module.

20. The system of claim 15, wherein the power plant includes a fourth generator that generates a fourth power signal, the first front-end module further selectively transmits at least a portion of the fourth power signal from the input of the first front-end module to the output of the first front-end module, and the second front-end module further selectively transmits the portion of the fourth power signal from the input of the second front-end module to the output of the second front-end module, wherein

the backend bus is coupled to an input of each of a first feed and a second feed for a fourth distribution module that corresponds to the fourth generator, such that

when the second front-end module is selected to transmit the portion of the fourth power signal, the backend bus transmits the portion of the fourth power signal to the first feed for the fourth distribution module, and

when the first front-end module is selected to transmit the portion of the fourth power signal, the backend bus transmits the portion of the fourth power signal to the second feed for the fourth distribution module.