High quality electrical power distribution system

• US 5,477,091 A
• Filed: 11/04/1992
• Issued: 12/19/1995
• Est. Priority Date: 11/27/1991
• Status: Expired due to Term

• Current Assignee: Merlin Gerin
• Original Assignee: Gerin Merlin
• Inventors: Fiorina, Jean-Noel, Pillet, Jean-Jacques
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Elms, Richard T.
• Application Number:
  US07/971,224
• Time in Patent Office: 1,140 Days
• Field of Search: 307/18, 307/22, 307/23, 307/26, 307/44, 307/45, 307/46, 307/48, 307/58, 307/72, 307/64-66, 307/80, 307/82, 307/38, 307/40, 340/310 R, 340/310 A, 340/310 CD, 340/310.01, 340/310.08, 363/16, 363/131, 363/39, 363/40, 363/37, 363/35, 363/71, 371/66, 365/227-229
• US Class Current: 307/66
• CPC Class Codes: H02J 1/14 Balancing the load in a network
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge

Abstract

The system comprises a central module supplying a distribution network, for example formed by a bus, with permanent DC power. Terminal modules, located near the loads, convert the DC power distributed by the distribution network into DC or AC electrical power adapted to the requirements of each load. A communication bus enables data communication between the various modules.

Claims

1. A system for distribution of high quality electrical power to a plurality of loads from an AC electrical power distribution network, said system comprising:

a central module for converting alternating current of the AC network into direct current, said central module comprising at least one autonomous back-up DC power source so as to constitute a permanent DC power source;

a DC distribution network connected to the central module for distributing direct current received from the central module;

a plurality of terminal modules connected to receive direct current from the DC distribution network, wherein each of the plurality of terminal modules is connected to a corresponding one of the plurality of loads which are to receive power from the system, each of the plurality of terminal modules includes conversion means for converting the direct current received from the DC distribution network into at least one of a predetermined high quality AC and DC current suitable for the corresponding load connected thereto, and each of the plurality of loads are functionally isolated from each other by the terminal modules; and

communication means for communicating data representative of the state of the system at least between each terminal module and the central module;

wherein the data representative of the state of the system comprises data representing a signal indicating operation of the central module from the autonomous power source and data representing an end of back-up time pre-alarm signal.

2. The system according to claim 1, wherein the central module supplies a symmetrical DC voltage with respect to a neutral of the AC network, the DC distribution network comprising three conductors including a neutral conductor directly connected to the AC network neutral.

3. The system according to claim 1, wherein each terminal module is connected to the DC distribution network by means of an associated connection box containing low-pass filters and means for protection against short-circuits 4.

4. The system according to claim 1, wherein the communication means comprise a communication bus distinct from the DC distribution network.

5. The system according to claim 1, wherein communication is achieved by means of carrier currents superposed on the direct current on the DC distribution network.

6. The system according to claim 1, wherein the end of back-up time pre-alarm signal is representative of the end of back-up time of the autonomous back-up DC power source.

7. The system according to claim 1, wherein the pre-alarm signal is representative of the end of back-up time of one of the terminal modules, a predetermined back-up time being assigned to each of the terminal modules.

8. The system according to claim 1, wherein the data representative of the state of the system comprise data representative of the presence and correct operation of the terminal modules.

9. The system according to claim 1, wherein the data representative of the state of the system comprise data representative of the presence, within preset tolerances, of a voltage line-side of the terminal modules and of voltage and current load-side of the terminal modules.

10. The system according to claim 1, wherein the data representative of the state of the system comprise data concerning metering of the power delivered by each terminal module to an associated load.

11. The system according to claim 1, wherein the communication means are connected to a centralized monitoring device external to the system.

12. The system according to claim 1, wherein the DC distribution network is a bus.

13. The system according to claim 1, said system further comprising synchronization means connected to the terminal modules converting the direct current into alternating current.

14. The system according to claim 1, further comprising a redundant central module and means for connecting the redundant central module to the DC distribution network in the event of a failure of the central module.

15. The system according to claim 1, wherein the central module includes first and second converters respectively coupled to first and second charger regulator circuits.