Valve control logic for gas turbine recuperator

• US 6,463,730 B1
• Filed: 07/12/2000
• Issued: 10/15/2002
• Est. Priority Date: 07/12/2000
• Status: Expired due to Fees

• Current Assignee: Honeywell Space Systems Incorporated
• Original Assignee: Honeywell Space Systems Incorporated
• Inventors: Burns, Daniel, OʼBrien, Patrick, Vhora, Mohamad Hanif, Nguyen, Coung Van, Keller, Timothy J.
• Primary Examiner(s): Casaregola, Louis J.
• Application Number:
  US09/614,301
• Time in Patent Office: 825 Days
• Field of Search: 60/392.4, 60/395.11, 60/395.12, 60/392.7, 607/95
• US Class Current: 60/39.24
• CPC Class Codes: F02C 9/18 by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages F02C3/113 takes precedence
• CPC Class Codes: F02C 9/28 Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed F02C9/30 - F02C9/38, F02C9/44 take precedence
• CPC Class Codes: F02C 9/52 by bleeding or by-passing the working fluid
• CPC Class Codes: F05D 2270/04 to control acceleration (u)
• CPC Class Codes: F05D 2270/091 in particular sudden load loss
• CPC Class Codes: F05D 2270/304 Spool rotational speed

Abstract

Control logic and a method for controlling turbine speed. In an embodiment, the inventive control logic controls turbine speed of turbine generators operating in a stand-alone mode and/or a grid mode.

Claims

1. Control logic for controlling a turbine in response to a change in load comprising

at least one input for inputting at least one turbine parameter selected from the group consisting of turbine speed, turbine acceleration, temperature, gas flow, and parameters proportional thereto;

at least one circuit for comparing each selected turbine parameter to at least one turbine control criterion for that parameter wherein the at least one turbine control criterion comprises a member selected from the group consisting of activation criteria and reset criteria; and

outputting a valve control signal to a bypass valve in a duct that supplies gas to a recuperator for the turbine, the bypass valve diverting gas flow away from the turbine.

2. The control logic of claim 1 wherein said valve control signal controls a bypass valve that causes bypass of at least 1% of the total gas flow from an air supply compressor to said recuperator.

3. Control logic for controlling a turbine in response to a change in load comprising:

at least one circuit for inputting at least one turbine parameter selected from the group consisting of turbine speed and turbine acceleration;

at least another one circuit for comparing said at least one turbine parameter to at least one turbine control criterion wherein the at least one turbine control criterion comprises a member selected from the group consisting of activation criteria and reset criteria and wherein the at least another one circuit outputs a control signal to a bypass valve in a duct supplying air to a recuperator for the turbine, the bypass valve diverting air flow away from the turbine.

4. The control logic of claim 3, wherein said valve control signal controls a bypass valve that causes bypass of at least 1% of the total gas flow from an air supply compressor to said recuperator.

5. Control logic for controlling a turbine comprising:

at least one input for inputting a turbine speed value, a turbine speed set-point criterion, a speed activation criterion, a speed reset criterion, a turbine acceleration load criterion, and a turbine acceleration unload criterion; and

at least one circuit for determining a speed error value from said turbine speed value and said turbine speed set-point and a turbine acceleration value from said turbine speed value and for comparing said turbine acceleration value to said turbine acceleration load criterion, said turbine acceleration value to said turbine acceleration unload criterion, said speed error value to said speed activation criterion and said speed error value to said speed reset criterion wherein said at least one circuit outputs a control signal to a valve that diverts air flow away from said turbine.

6. Control logic for controlling a turbine comprising:

at least one input for inputting a turbine speed value, a turbine speed set-point criterion, a speed activation criterion, a speed reset criterion; and

at least one circuit for determining a speed error value from said turbine speed value and said turbine speed set-point and for comparing said speed error value to said speed activation criterion and said speed error value to said speed reset criterion wherein said at least one circuit outputs a control signal to a valve that diverts air flow away from said turbine.