Data processing: generic control systems or specific application – Specific application – apparatus or process – Electrical power generation or distribution system
Reexamination Certificate
2001-06-19
2004-07-20
Picard, Leo (Department: 2125)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Electrical power generation or distribution system
C700S286000, C702S188000
Reexamination Certificate
active
06766224
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an integrated operation instructing system for power generation plants, and more particularly to an integrated operation instructing system; for operating power generation plants that is capable of operating gas turbine power generation plants in a highly efficient and economical manner.
2. Prior Art
Conventionally, in electric utilities, a central load dispatching instruction station calculates a load demand for each power generation plant and transmits it to each power generation plant via a telephone line or an exclusive telecommunication line. Each power generation plant receives the target load from the central load dispatching instruction station and controls the power output based on the target load.
In recent years, most power generation plants are gas turbine combined plants that have improved thermal efficiency. Since the efficiency of the compressor in a gas turbine plant is decreased significantly due to contamination accumulated on the compressor blades, the thermal efficiency of a gas turbine power generation plant unavoidably deteriorates over time.
FIG. 1
is a view showing the construction of a conventional integrated power generation plant operation instructing system for operating gas turbine power generation plants. A central load dispatching instruction station
10
is connected to N gas turbine power generation plants
11
n
(1≦n≦N) via exclusive telecommunication lines
12
n.
The central load dispatching instruction station
10
is comprised of a supervisory operation panel
101
with which an operator operates and/or supervises the plants and a load dispatching instruction computer
102
which calculates a target load to be allocated to each of the power generation plants and which is connected via an interfaces (SCADA)
103
n
to the exclusive telecommunication lines
12
n.
The gas turbine power generation plant
11
n
is comprised of a controller
11
n
1
for controlling a gas turbine power generator
11
n
0
, an operating panel
11
n
2
for operating the gas turbine power generator
11
n
0
, and a data logger computer
11
n
3
for collecting the operating status data of the gas turbine power generator
11
n
0
. The controller
11
n
1
is connected via an interface (SCADA)
11
n
4
to the exclusive telecommunication line
12
n
. The controller
11
n
1
, the operating panel
11
n
2
and the data logger computer
11
n
3
are connected to each other via a bus
11
n
5
.
Thus, the target load for each gas turbine power generation plant calculated by the load dispatching instruction computer
102
is transmitted via the exclusive telecommunication line
12
n
to the controller
11
n
1
of the gas turbine power generation plant
11
n
, and each gas turbine power generator
11
n
0
is controlled based on the target load.
Output efficiency of a gas turbine power generator is influenced by the contamination of the compressor. Conventionally, however, in calculating the target load to each gas turbine power plant, the contamination of the compressor has not been taken into account. Thus, the cost of the power generation has not been considered in the calculation of the target load.
SUMMARY OF THE INVENTION
It is an object of the present invention to resolve the above-mentioned problem and to provide an integrated operation instructing system for power generation plants that is capable of operating gas turbine power generation plants in a highly efficient and economical manner.
According to a first aspect of the present invention, an integrated operation instructing system for power generation plants is comprised of a central load dispatching instruction station for instructing a target load to each of a plurality of gas turbine power generation plants; and a telecommunication line for connecting the plurality of gas turbine power generation plants to the central load dispatching instruction station. Each of the gas turbine power generation plants comprises gas turbine power generation plant control means for controlling the output of the gas turbine generator based on the target load instructed by the central load dispatching instruction station and operating status data transmitting means for transmitting the operating status data of the gas turbine power generation plant to the central load dispatching instruction station. The central load dispatching instruction station comprises deteriorating rate evaluating means for evaluating the deteriorating rate of the gas turbine based on the operational status data of the gas turbine power generation plant transmitted from the operational data transmitting means, optimal target load calculating means for calculating the optimal target load that minimizes total operating cost based on the deteriorating rate of the gas turbine calculated by the deteriorating rate evaluating means, and optimal target load output transmitting means for transmitting the optimal target load calculated by the optimal target load calculating means to the gas turbine power generation plant control means.
According to the first aspect of the present invention, the operational status data of the gas turbine power generation plant are transmitted to the central load dispatching instruction station, where the deteriorating rate of the gas turbine is evaluated. Then an optimal target load that minimizes the total operating cost, taking the deteriorating rate of the gas turbine into account, is set.
According to a second aspect of the present invention, the operating status data transmitting means transmit the data on the output of the gas turbine generator, the opening of the inlet guide vane, the pressure in the combustor cylinder, atmospheric temperature and a kind of fuel as the operating status data. The deteriorating rate evaluating means evaluates the deteriorating rate of the gas turbine based on the output of the gas turbine generator, the opening of the inlet guide vane, the pressure in the combustor cylinder, atmospheric temperature and the kind of fuel.
According to the second aspect of the invention, the deteriorating rate is corrected based on the output of the gas turbine generator, the opening of the inlet guide vane, the pressure in the combustor cylinder, atmospheric temperature and the kind of fuel.
According to a third aspect of the present invention, the operating status data transmitting means transmits the operating status data to the central load dispatching instruction station via the Internet. The optimal target load transmitting means transmits the optimal target load via exclusive telecommunication lines.
According to the third aspect of the invention, the optimal target load is transmitted via exclusive telecommunication lines; and the operating status data are transmitted via the Internet.
REFERENCES:
patent: 4578944 (1986-04-01), Martens et al.
patent: 6556956 (2003-04-01), Hunt
patent: 19614405 (1997-10-01), None
patent: 2007926 (1979-05-01), None
Garland Steven R.
Mitsubishi Heavy Industries Ltd.
Picard Leo
Wenderoth , Lind & Ponack, L.L.P.
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