JPH04258740A - Power plant performance diagnostic device - Google Patents

Abstract

PURPOSE:To easily specify the unit efficiency fluctuation deterioration factor by calculating the unit efficiency of a power plant and unit efficiency correction items of power plant apparatuses based on the measured data. CONSTITUTION:A unit efficiency calculating means 4 calculates the unit efficiency (generating end efficiency) and unit efficiency correction items at the apparatus level from the measured data of a power plant 2, and a unit efficiency deterioration factor judging means 5 compares the calculated results with the reference values and judges in which apparatus the unit efficiency fluctuation deterioration factor exists. A measured/performance data fluctuation judging means 6 compares the measured/performance data values of the apparatus judged as the fluctuation deterioration factor with the reference values and judges in which measured data the fluctuation deterioration factor exists. A sensor state judging means 7 judges whether the sensor of the apparatus judged to have the fluctuation deterioration factor is normal or not, and a display means 8 displays the results on a display device 10.

Description

[Detailed description of the invention]

[Object of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant performance diagnostic device for diagnosing the performance of a power plant.

0002

[Background Art] Conventionally, in power generation plant performance diagnosis, for example, the unit efficiency during operation is calculated, and this calculation result is compared with the standard efficiency at the time of plant design, and the factors of fluctuation in power generation plant deterioration are evaluated using related measurement data. This was done by investigating the status of Alternatively, turbines, feed water heaters,
By calculating the efficiency of typical equipment such as boilers and air preheaters (gas air heaters) and comparing these calculation results with each standard efficiency, we investigate the condition of plant component equipment that affects unit efficiency deterioration. A power plant performance diagnosis was being conducted.

0003

[Problems to be Solved by the Invention] However, in order to investigate the cause of deterioration of unit efficiency, there are the following problems.

[0004] That is, in order to investigate the cause of unit efficiency deterioration, effort is required to investigate the state of all measurement data used to calculate unit efficiency. In particular, there was a problem in that it required a great deal of effort to investigate the cause of deterioration from among the measured data of several dozen points. Further, when a plurality of pieces of measurement data become abnormal at the same time and the unit efficiency deteriorates, it is not easy to identify the cause. Furthermore, there is a problem in that it is difficult to determine the true cause of deterioration based solely on the state of the auxiliary machines that make up the representative plant due to the lack of information data.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power generation plant performance diagnostic device that can easily identify factors causing unit efficiency fluctuations and deterioration.

[Configuration of the invention]

[Means for Solving the Problems] The present invention provides a measurement data file that inputs and saves measurement data, and a unit that calculates the unit efficiency of a power plant and the unit efficiency correction term of power plant equipment based on this measurement data. An efficiency calculation means, an efficiency calculation result file that stores the calculated values of the calculated unit efficiency and unit efficiency correction term, and unit efficiency standard value data that stores the unit efficiency and the standard value of the unit efficiency correction term of the power generation plant equipment. file, a measurement/performance data standard value file that stores standard values such as measurement data and performance data around power generation plant equipment, and calculated values of the unit efficiency and unit efficiency correction term calculated by the unit efficiency calculation means. A unit efficiency deterioration factor determination means that compares the unit efficiency stored in the unit efficiency standard value data file with the standard value of the unit efficiency correction term to determine which device is responsible for the unit efficiency fluctuation deterioration factor, and the determination result. The efficiency deterioration determination result file that stores the unit efficiency deterioration determination result file, the measurement data and performance data values of the equipment that has been determined to have a unit efficiency fluctuation deterioration factor, and the corresponding measurement data and performance data of the measurement and performance data standard value file. A measurement/performance data variation judgment means that compares the data with a reference value to determine which measurement data and performance data is the cause of unit efficiency variation deterioration, and a measurement/performance data judgment result file that stores the judgment results. , a sensor state determination unit that determines whether or not the state of a sensor related to a device that is determined to have a unit efficiency fluctuation deterioration factor based on measurement data stored in a measurement data file is normal; and a sensor state that stores this determination result. A display means for displaying the judgment result file and each data of each file on the display device, and setting the reference values saved in the unit efficiency reference value data file and the measurement/performance data reference value file and displaying the screen on the display device. The present invention is provided with an input means for displaying a display command, and a display device for displaying, by means of a display means, which measurement data of which equipment is the cause of unit efficiency fluctuation deterioration.

[0007]

[Function] With the above configuration, when it is found that unit efficiency fluctuations have deteriorated, in addition to the fluctuation state of each unit efficiency and its correction term, the state of deviation from the allowable range of measurement and performance data from the reference value, and the surroundings of the equipment It is possible to display abnormalities in the measurement sensor, etc. on the display device. Therefore, unit efficiency fluctuations and deterioration factors can be easily identified from these displays.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a power plant performance diagnostic apparatus showing an embodiment of the present invention. Sensors 3 installed in various parts of the power generation plant 2 are connected to the power generation plant performance diagnosis device 1 . The power generation plant performance diagnosis device 1 includes a unit efficiency calculation means 4, a unit efficiency deterioration factor determination means 5, a measurement/performance data fluctuation determination means 6, a sensor state determination means 7, a display means 8, an input means 9, a display device 10, and the following: It consists of each file.

That is, the power generation plant performance diagnosis device 1 includes a measurement data file 11a, a unit efficiency reference value data file 11b, and a measurement/performance data reference value file 11c.
, measurement/performance data judgment result file 11d, efficiency deterioration judgment result file 11e, efficiency calculation result file 11f
and a sensor state determination result file 11g.

Here, the unit efficiency calculation means 4 reads measurement data from the measurement data file 11a, and calculates the unit efficiency (actual value), unit efficiency correction term, and unit efficiency (correction value) from the fuel flow rate, generator power, etc. Calculate each. These calculation results are in the efficiency calculation result file 11
Saved in f.

The unit efficiency deterioration factor determination means 5 compares the calculation result of the unit efficiency calculation means 4 with the unit efficiency reference value of the unit efficiency reference value data file 11b to determine the deterioration of the unit efficiency. This determination result is stored in the efficiency deterioration determination result file 11e.

The measurement/performance data fluctuation determination means 6 compares the measurement/performance data used for performance diagnosis with the reference value of the measurement/performance data reference value file 11c, and determines whether the measurement/performance data is within the allowable range with respect to the reference value. Determine whether or not. This determination result is saved in the measurement/performance data determination result file 11d.

[0014] The sensor state determining means 7 is connected to the power generation plant 2.
It is determined whether the state of the sensor 3 is normal or not. This determination result is saved in the sensor state determination result file 11g.

The display means 8 displays the calculation results and judgment results of the measurement/performance data judgment result file 11d, the efficiency deterioration judgment result file 11e, the efficiency calculation result file 11f, and the sensor condition judgment result file 11g on the display device 10. do.

The input means 9 arbitrarily sets and changes the reference value data of the unit efficiency reference value data file 11b and the reference value data of the measurement/performance data reference value file 11c. Further, the input means 9 is a console that allows the operator to display data stored in the unit efficiency reference value data file 11b and the measurement/performance data reference value file 11c on the display device 10.

The display device 10 includes a measurement/performance data reference value file 11c, a measurement/performance data judgment result file 1
1d, the efficiency deterioration determination result file 11e, the efficiency calculation result file 11f, and the sensor state determination result file 11g are displayed on the display screen according to a request from the input means 9.

The measurement data file 11a stores measurement data transmitted from the sensor 3 installed in the power generation plant 2. Furthermore, the measurement data file 11a has an area for storing measurement data necessary for calculating unit efficiency a plurality of times within a certain period of time. The measurement data obtained when unit efficiency calculation is performed after this fixed period erases the oldest measurement data on the measurement data file 11a and is rewritten with this.

Unit efficiency standard value data file 11b
is the unit efficiency (
Each reference value for comparison with the performance calculation result of unit efficiency (actual measurement value), unit efficiency correction term, and unit efficiency (correction value) is stored.

The measurement/performance data reference value file 11c stores each reference value for comparison with measurement data and performance data calculation results by the measurement/performance data fluctuation determination means 6.

Measurement/performance data judgment result file 11d
stores the determination results of the measurement/performance data variation determination means 6.

The efficiency deterioration determination result file 11e stores the determination results of the unit efficiency deterioration factor determining means 5.

The efficiency calculation result file 11f stores the performance calculation results of the unit efficiency calculation means 4. The efficiency calculation result file 11f has an area for storing the calculation results of unit efficiency calculations performed a plurality of times within a certain period of time. The calculation result when unit efficiency calculation is performed after this fixed period erases the oldest calculation result on the efficiency calculation result file 11f and is rewritten with this.

The sensor state determination result file 11g stores the determination results of the sensor state determination means 7. This sensor state determination result file 11g has an area for storing the determination results of multiple performance diagnoses performed within a certain period of time. The determination result when the performance diagnosis is performed after this certain period of time is rewritten by erasing the oldest determination result on the sensor state determination result file 11g.

With the above configuration, the operation of this embodiment will be explained with reference to the processing procedure shown in FIG.

First, the measurement data file 11a stores measurement data d1 transmitted from the sensor 3 installed in the power generation plant 2 (101). This measurement data file 11a has an area that can store one month's worth of measurement data even if power plant performance diagnosis is performed twice a day.

Next, the unit efficiency calculation means 4 calculates the unit efficiency (actual measurement value) from the measurement data d2 such as fuel flow rate and generator power stored in the measurement data file 11a. At the same time, a unit efficiency correction term is calculated from measurement data around the power plant equipment, such as condenser vacuum degree, atmospheric temperature, main steam temperature, etc., and added to the unit efficiency (actual value) to determine the unit efficiency. Find (correction value) (10
2).

This unit efficiency correction term includes, for example, generator power factor, condenser vacuum degree, atmospheric temperature, fuel hydrogen moisture, heavy oil heater inlet fuel temperature, steam air preheater steam flow rate, high temperature hot water heater steam flow rate, low temperature hot water heater steam flow rate, turbine inlet main steam pressure, turbine inlet main steam temperature, reheater outlet steam temperature, reheater steam pressure drop, boiler exhaust gas temperature,
Determined based on measurement and performance data of the steam air preheater steam drain condenser destination.

For example, the unit efficiency correction term ΔηPP based on the generator power factor PR is obtained by the following formula.

[0030]

[Equation 1] ΔηPP=(ηG0−ηG)×(ηT0/
ηG0)×ηB0×100

[0031] Here, ΔηPP: Unit efficiency correction term based on generator power factor [%] η
G: ηG=f(PR) Generator efficiency by power factor PR [%] PR: Generator power factor
ηG0
: Boiler efficiency
(Planned value) [%] ηT0
:Turbine efficiency
(Planned value) [%] ηB0
: Generator efficiency
(Planned value) [%]

The unit efficiency (actual measurement value), unit efficiency (correction value), unit efficiency correction term, and calculation results d3 for each device generated in the calculation process obtained by this unit efficiency calculation means 4 are shown in FIG. It is saved in the efficiency calculation result file 11f of the configuration like (1
03).

Furthermore, the unit efficiency calculation means 4 calculates the standard deviation of each unit from the calculation result d3 of the efficiency calculation result file 11f and the measurement data d2 of the measurement data file 11a, and uses this result as the efficiency calculation result. Save to file 11f. That is, the efficiency calculation result file 11
Read the unit efficiency (actual measurement value) for the past month from f, each unit efficiency correction term, unit efficiency (correction value), and calculation result d3, and read the past one month from the measurement data file 11a.
Read the measurement data d2 for months. Then, through a calculation process such as squaring the difference between each of these average values and the measurement data d2 or the calculation result d3, and calculating the square root of the sum of the squares, the unit efficiency (actual value) and each unit efficiency correction term are calculated. , the standard deviation d03 for the performance data and calculation data of the unit efficiency (correction value) is calculated. These standard deviations d03 are then stored in the efficiency calculation result file 11f.

[0034] Here, to specifically explain the structure of the efficiency calculation result file 11f shown in FIG. 3, the area F1 is an area for saving the first unit efficiency calculation result. Similarly, the second unit efficiency calculation result is stored in the area F2, and the third unit efficiency calculation result is stored in the area F3, and areas are provided for repeating this in the same file format thereafter.

Assuming that the unit efficiency calculation is performed, for example, twice a day, the number of areas is set to 62 and the area is reserved in the efficiency calculation result file 11f so that one month's worth of calculation results d3 can be saved. At the beginning of each area, the unit efficiency calculation date and time are stored, and using these data, the display means 8 can display the unit efficiency calculation date and time on the display device 10. Calculation result no. 1 and no. The unit efficiency (actual measurement value) and the calculation result of the unit efficiency (corrected value) are stored in the part 2, and the calculation result No. 3~No. The calculation result of each unit efficiency correction term is stored in the part 16. Also, the calculation result N
o. From 17 onwards, the calculation results of performance data of each device are saved.

Next, the unit efficiency deterioration factor determination means 5 stores the unit efficiency (actual value) and unit efficiency (corrected value) of the calculation result d3 of the unit efficiency calculation means 4 in the unit efficiency reference value data file 11b. It is compared with a reference value d4 stored in advance (104).

Here, the allowable range of the difference from the reference value d4 used to determine whether or not the unit efficiency has deteriorated is the unit efficiency (actual value) calculated by the unit efficiency calculation means 4, the unit efficiency ( Standard deviation d03 of correction value)
be the value of In this determination, if the calculation result d3 of the unit efficiency (correction value) is lower than the allowable range compared to the reference value d4, it is determined that the unit efficiency has deteriorated (105). The determination result d5 by the unit efficiency deterioration factor determining means 5 is saved in the efficiency deterioration determination result file 11e (10
6).

In the following procedure, the unit efficiency deterioration factor determination means 5 calculates the calculation result d3 of the unit efficiency calculation means 4 stored in the unit efficiency reference value data file 11b.
Each unit efficiency correction term is compared with a reference value d4 stored in advance in the unit efficiency reference value data file 11b corresponding to each unit efficiency correction term (107).

Here, in order to determine whether or not there is a fluctuation, the reference value d4 is the value of the standard deviation d03 of the unit efficiency correction term calculated by the unit efficiency calculation means 4. In this case, the calculation result d3 is the reference value d of the unit efficiency correction term.
4 to outside the allowable range, it is determined that the unit efficiency correction term is abnormal outside the allowable range (108). The determination result d5 of the unit efficiency deterioration factor determining means 5 is stored in the efficiency deterioration determination result file 11e (109).

Next, measurement/performance data variation determination means 6
Then, the reference value d6 stored in the measurement/performance data reference value file 11c is compared with the measurement data d2 stored in the measurement data file 11a and the calculation result d3 calculated by the unit efficiency calculation means 4 (110). .

Here, the reference value d6 used to determine whether or not there is a fluctuation is the standard deviation d03 of the measurement/performance data obtained by the unit efficiency calculation means 4. In this performance diagnosis, if the measurement data and performance data fluctuate outside the allowable range, that is, outside the reference value d6, it is determined that the measurement/performance data is out of the allowable range abnormality (111). This determination result d7 by the measurement/performance data variation determination means 6 is saved in the measurement/performance data determination result file 11d (112).

Subsequently, the sensor state determining means 7 reads the measurement data d2 of the measurement data file 11a, and determines the state of the sensor 3, ie, whether there is a disconnection, deviation from the measurement range, etc. (113). As a result, if a state such as a disconnection or deviation from the measurement range occurs, the measurement data d2
is determined to be abnormal (114). This determination result d8 is saved in the sensor state determination result file 11g (115
).

Next, the display means 8 sends each data stored in the following files to the display device 10 in response to a screen display request d9 from the input means 9.

That is, these data include the measurement data d2 of the measurement data file 11a and the reference value d4 of the unit efficiency correction term of the unit efficiency reference value data file 11b.
, there is a measurement/performance data reference value d6 of the measurement/performance data reference value file 11c. Furthermore, in addition to the above, performance data of the efficiency calculation result file 11f, unit efficiency (
actual measurement value), unit efficiency (correction value) and calculation result d10 of each unit efficiency correction term, judgment result d11 of sensor condition judgment result file 11g, judgment result d12 of efficiency deterioration judgment result file 11e, measurement/performance data judgment result file There are determination results d13 and the like of 11d.

The input means 9 converts the unit efficiency (actual measurement value) and unit efficiency (correction value) stored in the unit efficiency reference value data file 11b into a reference value d4 of each unit efficiency correction term as an arbitrary numerical reference value. d15 along with the settings. The input means 9 also sets and changes the measurement/performance data reference value d6 stored in the measurement/performance data reference value file 11c to an arbitrary numerical value reference value d16, and sends a screen display request d9 to the display means 8. give to

The display device 10 displays the unit efficiency correction result as shown in FIG. 4 in accordance with the screen display command d14 of the display means 8 (116).

Example 41 of this unit efficiency correction result display screen
In the unit efficiency numerical value display section 42 on the left side, calculation results d10 of unit efficiency (actual value) and unit efficiency (corrected value) stored in the efficiency calculation result file 11f are displayed in numerical values. In addition, the unit efficiency correction term bar graphs 43 on the center and right side show the calculation results d10 of each unit efficiency correction term stored in the efficiency calculation result file 11f and the unit efficiency reference value data file 11.
Reference value d4 of each unit efficiency correction term stored in b
is displayed as a bar graph. In this case, if the determination result d12 of each unit efficiency correction term stored in the efficiency deterioration determination result file 11e has an abnormality outside the allowable range, the display means 8 that received the determination result d12 determines that it is abnormal. Displays the bar graph of the unit efficiency correction term in a different color. For example, in the unit efficiency correction result display screen example 41 in FIG. 4, the unit efficiency correction term bar graph 43 displays correction values such as power factor and degree of vacuum, that is, correction values, efficiency correction term and reference correction term in a bar graph. The correction term for the main steam temperature changes color as an abnormality. Note that 44 is a fixed display for showing a display example of the unit efficiency correction term bar graph 43.

Next, the display means 8 causes the display device 10 to display the determination result of the unit efficiency correction term, as shown in FIG. 5 (117).

This unit efficiency correction term determination result display screen example 45 includes the calculation result d3 of the unit efficiency calculation means 4, the determination result d5 of the unit efficiency deterioration factor determination means 5, and the measurement result d3.
This is an example of display based on the determination result d7 of the performance data fluctuation determination means 6 and the determination result d8 of the sensor state determination means 7.

[0050] In the unit efficiency numerical display section 46 at the upper right side of the figure, the calculation results d10 of the unit efficiency (actual value) and unit efficiency (corrected value) stored in the efficiency calculation result file 11f are displayed numerically. ing.

[0051] Also, the block flowchart display section 4 at the lower right side
7 includes measurement data d2 stored in the measurement data file 11a, performance data stored in the efficiency calculation result file 11f, and calculation results d of each unit efficiency correction term.
10. The reference value d6 stored in the measurement/performance data reference value file 11c and the reference value d4 of each unit efficiency correction term stored in the unit efficiency reference value data file 11b are displayed as numerical values. In addition, the judgment result d13 saved in the measurement/performance data judgment result file 11d
When the judgment result d12 stored in the efficiency deterioration judgment result file 11e is an abnormality judgment or a deterioration judgment, the block of the measurement data d2 or the performance data calculation result d10 of the unit efficiency correction term is displayed on the display means 8.
The color will be changed and displayed.

[0052] The power plant equipment on the lower left side shown in Fig. 4
8, the determination result d11 stored in the sensor state determination result file 11g and the determination result d12 stored in the efficiency deterioration determination result file 11e are displayed on the display means 8.
Displayed by In this case, if the determination result d11 stored in the sensor state determination result file 11g is that the measurement data is abnormal, the display means 8 displays the measurement data in a different color for the sensor. moreover,
When the judgment result d12 stored in the efficiency deterioration judgment result file 11e is an abnormality outside the allowable range of the unit efficiency correction term, the display color of the device related to the unit efficiency correction term is changed by the display means 8. Is displayed. Note that 49 is a fixed display showing a display example of the block flowchart display section 47 and the power plant equipment diagram 48, but the display of abnormalities outside the standard value tolerance range of blocks 47a, 47b, and 47c of the block flowchart display section 47 is omitted from illustration. are doing.

[0053] According to this embodiment, if the unit efficiency has deteriorated at the time of power generation plant performance diagnosis, the sensor status is determined, each unit efficiency correction term is compared with the reference value, and the measurement, calculation, and performance data are While this can be confirmed by comparing with each standard value, it is also possible to elucidate the causes of unit efficiency fluctuations and deterioration.

For example, in the display screen example explained in FIG.
It is easy to see how much difference each unit efficiency correction term has from each reference value. In addition, in the display screen example in Figure 5,
The presence or absence of sensor abnormalities, measured data abnormalities outside the permissible range, performance data abnormalities outside the permissible range, and unit efficiency correction term abnormalities outside the permissible range can be easily determined. Therefore, when the unit efficiency fluctuates and deteriorates, this power plant performance diagnosis device can determine where in the unit efficiency calculation process or in which part of the power plant equipment the cause of the efficiency deterioration is.
It is possible to easily check whether there is any abnormality in each sensor of the power generation plant.

[0055] In this embodiment, the overall turbine efficiency and boiler efficiency are calculated by adding each correction term obtained from measurement, calculation, and performance data of the equipment in the same manner as the unit efficiency. As a result, although this embodiment estimates the deterioration factors due to fluctuations in unit efficiency, the means for estimating the deterioration factors using the same procedure as in this embodiment is also applied when determining deterioration of the overall turbine and boiler efficiency. be able to. In addition, when estimating factors for deterioration of internal efficiency of high-pressure, intermediate-pressure, and low-pressure turbines, deterioration of feedwater heater performance, deterioration of exhaust gas air preheater temperature, and increase in leak rate, the unit efficiency of this example is also useful. This can be carried out by the same means as the estimation of deterioration factors.

[0056]

[Effects of the Invention] As explained above, according to the present invention, it is possible to display whether or not the level of measurement data and sensor status from each device of the power generation plant deviates from the allowable range when diagnosing the performance of the power generation plant. . Therefore, it is possible to easily estimate the cause of performance deterioration of the power plant.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a power plant performance diagnostic device showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the processing procedure of the main parts of the device.

FIG. 3 is an explanatory diagram showing the structure of an efficiency calculation result file of the device.

FIG. 4 is an explanatory diagram showing an example of a unit efficiency correction result display screen of the apparatus.

FIG. 5 is an explanatory diagram showing an example of a unit efficiency correction term determination result display screen by the apparatus.

[Explanation of symbols]

1 Power generation plant performance diagnosis device 2 Power generation plant 3 Sensor 4 Unit efficiency calculation means 5 Unit efficiency deterioration factor determination means 6 Measurement/performance data fluctuation determination means 7 Sensor state determination means 8 Display means 9 Input means 10 Display device

Claims (1)

[Claims] [Claim 1] A measurement data file into which measurement data from a sensor is input and saved, and a unit efficiency of a power plant and a unit efficiency correction term of power plant equipment calculated based on the measurement data saved in this measurement data file. a unit efficiency calculation means for calculating the unit efficiency, an efficiency calculation result file for storing the calculated values of the unit efficiency and unit efficiency correction term calculated by the unit efficiency calculation means, and a unit for storing the reference value of the unit efficiency and the unit efficiency correction term. An efficiency standard value data file, a measurement/performance data standard value file that stores standard values such as measurement data and performance data around power generation plant equipment, and unit efficiency and unit efficiency correction calculated by the unit efficiency calculation means. A unit efficiency deterioration factor that compares the calculated value of the term with the unit efficiency stored in the unit efficiency standard value data file and the standard value of the unit efficiency correction term to determine which device is the cause of unit efficiency fluctuation deterioration. a determination means, an efficiency deterioration determination result file for storing the determination result of the unit efficiency deterioration factor determination means, measurement data of a device determined to have a unit efficiency fluctuation deterioration factor by the unit efficiency deterioration factor determination means; Compare the performance data value with the corresponding measurement data and performance data reference value in the measurement/performance data reference value file to determine which measurement data and performance data is the cause of unit efficiency fluctuation deterioration. A measurement/performance data fluctuation determination means, a measurement/performance data determination result file that stores the determination results obtained by the measurement/performance data fluctuation determination means, and a unit efficiency fluctuation/deterioration based on the measurement data stored in the measurement data file. A sensor state determination means that determines whether the state of a sensor related to a device that has been determined to have a factor is normal or not, a sensor state determination result file that stores the determination result obtained by this sensor state determination means, and the measurement/performance a display means for displaying each data of the data judgment result file, the efficiency deterioration judgment result file, the efficiency calculation result file, and the sensor state judgment result file on a display device; input means for setting a reference value to be stored in a performance data reference value file and instructing a display device to display a screen on the display means;
A power generation plant performance diagnostic device comprising: a display device for displaying, by the display means, which measurement data of which equipment is the cause of unit efficiency deterioration.