Gas turbine generating apparatus

• US 7,061,211 B2
• Filed: 03/15/2005
• Issued: 06/13/2006
• Est. Priority Date: 05/23/2001
• Status: Active Grant

• Current Assignee: Ebara Corporation, Ebara Densan Ltd. (Ebara Corporation)
• Original Assignee: Ebara Corporation, Ebara Densan Ltd. (Ebara Corporation)
• Inventors: Kataoka, Tadashi, Ozawa, Takahide, Ishihara, Seiichi, Kinoshita, Noboru, Zheng, Shao-jun, Mckelvey, Terence, Satoh, Motoyasu
• Primary Examiner(s): Schuberg, Darren
• Assistant Examiner(s): MOHANDESI, IRAJ A
• Application Number:
  US11/079,099
• Publication Number:
  US 20050179420A1
• Time in Patent Office: 455 Days
• Field of Search: 322/10, 322/12, 322/14, 322/32, 322/29
• US Class Current: 322/12
• CPC Class Codes: F01D 15/10 Adaptations for driving, or combinations with, electric generators
• CPC Class Codes: F02C 7/26 Starting; Ignition
• CPC Class Codes: F02C 7/268 Starting drives for the rotor , acting directly on the rotor of the gas turbine to be started
• CPC Class Codes: F05D 2270/06 to match engine to driven device
• 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 3/40 Synchronising a generator for connection to a network or to another generator
• CPC Class Codes: Y02E 20/14 Combined heat and power generation [CHP]

Abstract

A gas turbine generating apparatus according to the present invention comprises a gas turbine capable of a high-speed operation, a permanent-magnet-type generator driven at a high speed by the gas turbine, an inverter device (5) for converting alternating-current power generated by the generator into commercial alternating-current power, and a system-interconnection device (9) for interconnecting output of the inverter device to a commercial AC power supply system (10). The system-interconnection device controls the inverter device based on voltage of the commercial AC power supply system as a criterion such that output current of the inverter device is in phase with the voltage or out of phase with the voltage by a constant phase difference. A control device (18) is provided for operating the permanent-magnet-type generator (4) as a motor at a time of starting the gas turbine, and supplying alternating-current power from a direct-current power supply through the inverter device or another inverter device in addition to the inverter device to the generator for increasing a rotational speed smoothly from zero. The control device detects output current of the inverter device and controls the inverter device to keep the output current constant.

Claims

1. A gas turbine generating apparatus comprising:

a gas turbine capable of a high-speed operation;

a permanent-magnet-type generator driven by said gas turbine at a high speed;

an inverter device for converting alternating-current power generated by said permanent magnet type generator into commercial alternating-current power; and

a control device for operating said permanent-magnet-type generator as a motor at a time of starting said gas turbine, and supplying alternating-current power from a direct-current power supply through said inverter device or another inverter device in addition to said inverter device to said permanent magnet type generator for increasing a rotational speed smoothly from zero;

wherein said control device detects output current of said inverter device and controls said inverter device to keep the output current constant by supplying a rated current of said permanent magnet type generator constantly to said permanent magnet type generator.

2. A gas turbine generating apparatus according to claim 1, wherein said control device increases an output frequency of said inverter device from zero to a predetermined frequency within a short period of time when said gas turbine is started.

3. A gas turbine generating apparatus according to claim 1, wherein said direct-current power supply used to start said gas turbine comprises a storage battery.

4. A gas turbine generating apparatus according to claim 1, wherein said direct-current power supply used to start said gas turbine is produced by rectifying alternating-current power of a commercial AC power supply system.