Method and apparatus for controlling a steam turbine
First Claim
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1. An improved steam turbine system comprising:
- a steam turbine in which steam expands as it imparts torque to the turbine shaft;
means for generating a representation of the drop in steam enthalpy resulting from the expansion of steam in the turbine; and
means for controlling the operation of said turbine as a function of said steam enthalpy drop representation, whereby the turbine is controlled as a function of the actual steam conditions in the turbine.
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Abstract
An electric power plant steam turbine system with digital computer control in which control signals are generated as a function of the actual steam conditions present in each turbine section and in a manner which maintains the sum of the instantaneous power developed in each turbine section equal to the total demand placed upon the turbine system.
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Citations
59 Claims
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1. An improved steam turbine system comprising:
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a steam turbine in which steam expands as it imparts torque to the turbine shaft; means for generating a representation of the drop in steam enthalpy resulting from the expansion of steam in the turbine; and means for controlling the operation of said turbine as a function of said steam enthalpy drop representation, whereby the turbine is controlled as a function of the actual steam conditions in the turbine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for operating a steam turbine comprising:
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means for generating a turbine steam flow demand signal; means for generating a representation of turbine first-stage steam temperature and turbine exhaust steam pressure; means for generating a turbine first-stage steam pressure demand signal as a function of said steam flow demand signal, first-stage steam temperature, and exhaust steam pressure representations; and means for controlling the flow of steam to the turbine as a function of said turbine first-stage steam pressure demand signal. - View Dependent Claims (8, 9)
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10. A control system for a steam turbine comprising:
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means for determining turbine first-stage and exhaust actual steam conditions; means for generating a turbine operating representation as a function of said turbine first-stage and exhaust actual steam conditions; and means for controlling steam flow to the turbine as a function of said operating representation. - View Dependent Claims (11, 12)
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13. A system for operating a steam turbine supplied with steam at variable state points comprising:
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means for generating a representation of the actual change in steam conditions as the steam expands in the turbine; and means for controlling steam flow to the turbine as a function of said actual change in steam condition representation whereby the turbine is accurately controlled despite changes in supply steam conditions. - View Dependent Claims (14, 15)
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16. A digital computer control system for controlling steam turbine operation, comprising:
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means for determing turbine first-stage and exhaust steam temperatures and pressures; means for generating a predetermined turbine reference representation; general purpose programmed digital computer means for performing the function of generating a turbine operating representation as a function of said first-stage and exhaust temperatures and pressures and said reference representation; and steam valve means for controlling the flow of steam to the turbine as a function of said turbine operating representation. - View Dependent Claims (17, 18, 19)
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20. An improved steam turbine system comprising:
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a high pressure turbine; a low pressure turbine; means for directing the flow of steam from the high pressure turbine to the low pressure turbine; means for generating a representation of a predetermined total turbine power demand; means for generating a representation of the power developed by the low pressure turbine; means for generating a high pressure turbine power demand representation as the difference between the predetermined total turbine power demand representation and the low pressure turbine power representation; and means for operating the high pressure turbine to develop the power called for by said high pressure turbine power demand representation. - View Dependent Claims (21, 22, 23, 24, 25)
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26. An improved turbine system comprising:
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a steam turbine having a high pressure turbine element and a low pressure turbine element; means for generating representations of the steam conditions in each turbine element; and means for controlling the operation of the turbine as a function of the representations of the steam conditions in each turbine element. - View Dependent Claims (27, 28, 29)
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30. A digital computer control system for controlling the operation of a steam turbine having a high pressure turbine element, a low pressure turbine element and a reheater for reheating the steam passing from the high pressure turbine element to the low pressure turbine element, said system comprising:
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means for determining the first-stage and exhaust steam temperature and pressure of each turbine element and for generating representations thereof; means for generating a representation of a predetermined total turbine load demand; general purpose programmed digital computer means for performing the functions of generating a representation of the power developed by the low pressure turbine element as a function of the low pressure turbine first-stage and exhaust steam temperature and pressure representations, and generating an operating representation as a function of said low pressure turbine element power representation, the total load demand representation, and the high pressure turbine element first-stage and exhaust steam temperature and pressure representations; and steam valve means for controlling the flow of steam to said turbine as a function of said operating representation. - View Dependent Claims (31)
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32. An improved method for operating a steam turbine in which the steam expands as it imparts torque to the turbine shaft, said method comprising the steps of:
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generating a signal representing the drop in steam enthalpy resulting from the expansion of the steam in the turbine; generating a control signal as a function of said signal representing the steam enthalpy drop; and controlling the operation of the turbine as a function of said control signal, whereby the power generated by the turbine is controlled in accordance with the actual steam conditions in the turbine. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. An improved method of operating a steam turbine comprising the steps of:
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generating a signal representative of turbine steam flow demand; generating signals representative of turbine first-stage steam temperature and exhaust steam pressure; generating a turbine first-stage steam pressure demand signal as a function of said turbine steam flow demand, first-stage steam temperature and exhaust steam pressure signals; and controlling the flow of steam to the turbine as a function of said turbine first-stage steam pressure demand signal. - View Dependent Claims (40)
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41. A method of controlling a steam turbine comprising the steps of:
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generating a representation of actual steam conditions at the turbine first-stage and exhaust; generating a control signal as a function of said first-stage and exhaust steam condition representations; and controlling the flow of steam to the turbine as a function of said control signal. - View Dependent Claims (42, 43, 44, 46, 47)
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45. A digital computer control method for controlling steam turbine operations, comprising:
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determining turbine first-stage and exhaust steam temperature and pressure; generating a turbine reference representation; generating, with a general purpose programmed digital computer, a turbine operating representation as a function of turbine steam first-stage and exhaust temperature and pressures and said turbine reference representation; and controlling steam flow to the turbine as a function of said operating representation. - View Dependent Claims (48)
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49. A method of operating a steam turbine comprising a plurality of turbine elements, including the steps of:
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supplying a flow of steam to the first turbine element; directing the flow of steam from the exhaust of the first turbine element to the other turbine elements; generating a total power demand representation, representative of the total power to be generated by the turbine; generating representations of the instantaneous power developed by said other turbine elements; generating a first turbine element power demand representation as the difference between the total power demand representation and the other turbine element instantaneous power representations; and controlling the flow of steam to the first turbine element as a function of the first turbine element power demand representation. - View Dependent Claims (50, 51, 52)
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53. An improved method of operating a steam turbine having a high pressure turbine element and a low pressure turbine element comprising the steps of:
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generating representations of the steam conditions in each turbine element; generating a control signal as a function of said steam condition representations; and controlling the operation of the turbine as a function of said control signal. - View Dependent Claims (54, 55, 56, 57)
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58. A digital computer control method for controlling the operation of a steam turbine having a high pressure turbine element and a low pressure turbine element, comprising the steps of:
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generating representations of the first-stage and exhaust steam temperature and pressure for each turbine element; generating a representation of a predetermined total turbine load demand; generating, with a general purpose programmed digital computer, a representation of the power developed by the low pressure turbine element as a function of the low pressure turbine element first-stage and exhaust steam temperature and pressure representations, and an operating representation as a function of said low pressure turbine element power representation, the total load demand representation and the high pressure turbine element first-stage and exhaust steam temperature and pressure representations; and controlling the flow of steam to the turbine as a function of said operating representation. - View Dependent Claims (59)
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Specification