Auto-tuning device for electro-hydraulic converter and servo motors for controlling major valve in power plant turbine

Abstract

The present invention relates to an auto-tuning device for an electro-hydraulic converter and a servo motor for controlling a major valve in a power plant turbine, the auto-tuning device capable of automatically providing an electric command signal to the electro-hydraulic converter and determining the normal or abnormal operation state of the electro-hydraulic converter and the servo motor in response to the electric command signal.

Description

Electro-hydraulic converter and auto-tuning device for servomotor for controlling major valves of power plant turbines

[0001] The present invention relates to an auto-tuning device for an electro-hydraulic converter and a servo motor for controlling a major valve of a power plant turbine, which automatically provides an electric command signal to the electro-hydraulic converter and can check the normal operating state and malfunctioning state of the electro-hydraulic converter and the servo motor in response to the electric command signal.

[0002] In general, the major valve is composed of an electro-hydraulic converter and a servo motor. The electro-hydraulic converter is a type of hydraulic valve that receives an electric command signal (0 to 7 V → 0 to 250 mA) and converts it into a hydraulic signal of control oil pressure, and the servo motor is an actuator device that moves up and down by receiving the control oil hydraulic pressure of the electro-hydraulic converter. It is a core component of the power plant turbine major valve. After maintenance work at the power plant, correction work is performed on the electro-hydraulic converter and servo motor so that they can accurately follow the electric command signal.

[0003] Fig. 1 is a schematic diagram for calibration of a system composed of an existing electro-hydraulic converter and a servo motor. Referring to Fig. 1, an existing electro-hydraulic converter (11), a servo motor (12), an electric signal output device (13), a pressure gauge (14), a servo motor displacement measuring device (15), an electric command signal is input to the electro-hydraulic converter, and the control oil pressure for the input voltage is recorded in a first calibration certificate in the form of a chart, table, etc., and the displacement for the control oil pressure of the servo motor is recorded in the form of a chart, table, etc. in the second calibration certificate.

[0004] During the calibration work, the calibration work is performed by a total of four workers: one first worker to operate the electric command signal to the electric-hydraulic converter, one second worker to visually read the pressure gauge, and two third workers to read the displacement gauge.

[0005] The calibration work sequence is as follows: the first worker inputs a voltage signal using a signal input device (13) to the electro-hydraulic converter (11), inputs 0 to 1 V, waits for more than 10 seconds, and then the second worker reads the control oil pressure from the pressure gauge (14) and manually records it in the first calibration certificate.

[0006] The same method is performed for voltage signals of 1→2V, 2→3V, 3→4V, 4→5V, 5→6V, and 6→7V, and manually recorded in the first calibration certificate.

[0007] Once the calibration of the electro-hydraulic converter is completed, the calibration of the servo motor is performed.

[0008] The calibration work of the servo motor is to measure the control oil pressure that changes when a voltage signal of an electro-hydraulic converter is input and the displacement of the servo motor that moves according to this pressure. When a first worker inputs a voltage signal to the electro-hydraulic converter, a second worker looks at the scale of the pressure gauge (14) and, when each pressure condition indicated on the second calibration certificate is reached, a third worker measures the displacement of the servo motor, and in a place where one EH converter is supplied to two servo motors, a fourth worker reads the displacement scale for each pressure condition and manually records it on the second calibration certificate.

[0009] In this conventional calibration method, four workers are required, and the calibration work for each electro-hydraulic converter and servo motor is performed, which causes excessive time consumption.

[0010] Furthermore, conventional calibration methods rely solely on the operator's visual measurements of pressure and displacement, making accurate measurements difficult. Furthermore, measurements are manually recorded on the first and second calibration certificates, resulting in inaccurate calibration results. Furthermore, changes in operator personnel can lead to differences in measured values.

[0011] In other words, the conventional calibration method requires a lot of manpower for calibration work in the case of power plants with a large number of electro-hydraulic converters and servo motors, and all work results are recorded manually, which takes excessive work time and causes huge economic losses due to the delay in normal power generation, and the results are also inaccurate.

[0012] The present invention is intended to solve the above problems, and provides an auto-tuning device for an electro-hydraulic converter and a servo motor for controlling a major valve of a power plant turbine, which can check the normal operating state and malfunctioning state of the electro-hydraulic converter and the servo motor.

[0013] Another problem of the present invention is to provide an electro-hydraulic converter for controlling a major valve of a power plant turbine and an auto-tuning device for a servo motor, which can sequentially provide an electric command signal to the electro-hydraulic converter to simultaneously determine the control oil pressure status of the electro-hydraulic converter and determine the displacement of the control oil pressure of the servo motor.

[0014] Another object of the present invention is to provide an electro-hydraulic converter for controlling a major valve of a power plant turbine and an auto-tuning device for a servo motor, which can perform the following functions: outputting a displacement chart of the pressure of control oil, outputting a displacement chart for the pressure of the servo motor, calculating and judging hysteresis and deviation, calculating correction parameters, and outputting a report for each valve, according to an electric command signal provided to the electro-hydraulic converter.

[0015] Another object of the present invention is to increase power generation and stabilize electricity production at power plants through precise correction work in a short period of time using artificial intelligence.

[0016] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0017] According to one aspect of the present invention, an auto-tuning device for an electro-hydraulic converter and a servo motor for controlling a major valve of a power plant turbine is provided, the device including a first pressure measuring sensor for measuring the pressure of control oil flowing from an electro-hydraulic converter to a servo motor according to an electric command signal, a second pressure measuring sensor for measuring the pressure of supply oil input to the electro-hydraulic converter, an oil temperature sensor for measuring the temperature of the supply oil input to the electro-hydraulic converter, a displacement measuring sensor for measuring the displacement of a servo motor that receives control oil pressure of the electro-hydraulic converter and moves an actuator to open and close a major valve, and a control unit for receiving measurement signals from the first pressure measuring sensor, the second pressure measuring sensor, the oil temperature sensor, and the displacement measuring sensor and determining whether the electro-hydraulic converter is corrected.

[0018] The control unit may determine that if the pressure of the first pressure measurement sensor according to the electric command signal is outside a predetermined range or if the displacement of the servo motor according to the pressure of the first pressure measurement sensor is outside a predetermined range, calibration of the electro-hydraulic converter is necessary.

[0019] The control unit can transmit the electric command signal to the electro-hydraulic converter when the pressure of the supply oil received from the second pressure measurement sensor is within a predetermined range and the temperature of the supply oil received from the oil temperature sensor is within a predetermined range.

[0020] The control unit comprises a tuning condition confirmation unit for determining whether the pressure and temperature of the control oil are within the aforementioned predetermined range from the second pressure measurement sensor and the oil temperature sensor, a major valve selection unit for directly inputting information on the major valve or selecting it from pre-registered information, an electric command signal setting unit for setting an electric command signal in which a voltage of 0 to 7 V is sequentially provided to the electro-hydraulic converter, a guideline setting unit for setting a guideline for an allowable range for the control oil pressure measured by the first pressure measurement sensor with respect to the electric command signal and an allowable range for the displacement measured by the displacement measurement sensor, a correction operation START / STOP unit for sequentially providing an electric command signal to the electro-hydraulic converter so that the electro-hydraulic converter converts the electric command signal into a hydraulic signal of the control oil pressure, a measurement value output unit for outputting in real time the electric command signal, the pressure of the control oil measured by the first pressure sensor according to the electric command signal, and the displacement of the servo motor according to the pressure of the control oil, and a graph for the pressure of the control oil versus the electric command signal, and the control It may include a graph output section that automatically outputs a graph of the displacement of the servo motor (12) in comparison to the oil pressure, and a tuning calculation section that automatically calculates Hysteresis and Deviation values ​​using the information of the major valve, the measurement information of the first pressure measurement sensor, and the displacement measurement sensor, and outputs tuning parameters of the electro-hydraulic converter.

[0021] The above control unit may further include an error judgment unit that outputs an alarm when the Hysteresis and Deviation values ​​calculated by the tuning calculation unit exceed an allowable range.

[0022] The above control unit may further include a reporter output unit that outputs the graph output from the graph output unit and information on the major valve and the tuning parameter.

[0023] The above control unit may further include a displacement measurement sensor selection unit that selects at least one of at least two types of displacement measurement sensors.

[0024] The control unit may further include a database unit that stores information on a major valve, measurement information on a first pressure measurement sensor, a second pressure measurement sensor, a displacement measurement sensor, and an oil temperature sensor, and stores a correction value of a control oil valve, an artificial intelligence learning unit that trains artificial intelligence with the information on the major valve, the measurement information, and the correction value, and a correction value calculation unit that inputs the information on the major valve, measurement information on the first pressure measurement sensor, the second pressure measurement sensor, the displacement measurement sensor, and the oil temperature sensor into the learned artificial intelligence, and calculates a correction value of the control oil.

[0025] The above artificial intelligence learning unit applies a multi-layer perceptron model (MLP), and the input layer can be set to information of a major valve, measurement information of a first pressure measurement sensor, a second pressure measurement sensor, a displacement measurement sensor, and an oil temperature sensor, and the output layer can be set to a correction value.

[0026] According to the above configuration, the present invention can simultaneously and automatically determine whether the control oil pressure of an electro-hydraulic converter of a major valve of a power plant steam turbine is abnormal in response to an automatically input electric command signal and whether the displacement of a servo motor is abnormal in response to the control oil pressure input to the servo motor, thereby having the advantage of being able to be used for rapid and precise correction work of the electro-hydraulic converter and the servo motor.

[0027] In addition, the output of the electric command signal to the electro-hydraulic converter, the control oil pressure value and the servo motor displacement value can be automatically measured, enabling precise calibration work to be performed by one worker in a short period of time when calibrating the major valve.

[0028] Additionally, there is an advantage in that an alarm can be generated when the output of the electric command signal to the electro-hydraulic converter, the control oil pressure value and the servo motor displacement value are out of the allowable range.

[0029] Additionally, once the calibration work of the electro-hydraulic converter and servo motor is completed, the results can be reported immediately, which has the advantage of reducing manual work.

[0030] Additionally, there is an advantage in that power plants can increase their power production and stabilize electricity production through precise correction work in a short period of time using artificial intelligence.

[0031] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0032] Figure 1 is a schematic diagram illustrating the calibration of a system consisting of a conventional electro-hydraulic converter and a servo motor.

[0033] FIG. 2 is a schematic drawing of an electro-hydraulic converter and an auto-tuning device of a servo motor for controlling a major valve of a power plant turbine according to one embodiment of the present invention.

[0034] FIG. 3 is a block diagram schematically illustrating an electro-hydraulic converter for controlling a major valve of a power plant turbine and an auto-tuning device for a servo motor according to one embodiment of the present invention.

[0035] FIG. 4 is a graph schematically illustrating the results performed by an auto-tuning device for an electro-hydraulic converter and a servo motor for controlling a major valve of a power plant turbine according to one embodiment of the present invention.

[0036] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts irrelevant to the description are omitted in the drawings, and the same reference numerals designate identical or similar components throughout the specification.

[0037] The words and terms used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principles by which the inventor can define terms and concepts in order to best explain his or her invention.

[0038] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to a preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention, so there may be various equivalents and modified examples that can replace the configuration at the time of filing of the present invention.

[0039] In this specification, terms such as “include” or “have” are intended to describe the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0040] When a component is said to be "in front of," "behind," "above," or "below" another component, this includes not only being placed "in front of," "behind," "above," or "below" the other component in direct contact with it, but also if there is another component intervening therebetween. Furthermore, when a component is said to be "connected" to another component, this includes not only being directly connected to one another, but also being indirectly connected to one another, unless there are special circumstances.

[0041]

[0042] FIG. 2 is a schematic diagram illustrating an auto-tuning device of an electro-hydraulic converter (11) and a servo motor (12) for controlling a major valve of a power plant turbine according to one embodiment of the present invention. Before explaining the present invention, the electro-hydraulic converter (11) will be described. The electro-hydraulic converter (11) converts electric command signals of 1 V, 2 V, 3 V, 4 V, 5 V, 6 V, and 7 V into hydraulic signals of different control oil pressures each time they are sequentially input. That is, the electro-hydraulic converter (11) changes the pressure of the control oil supplied to the servo motor (12) according to the electric command signal.

[0043] Although not shown in detail, the electro-hydraulic converter (11) includes a control oil valve (not shown) that adjusts the pressure of the control oil discharged according to an electric command signal. For example, the control oil valve (not shown) can adjust the width of the pipe through which the control oil is discharged. Of course, the present invention is not limited thereto, and the control oil valve (not shown) can adjust the pressure of the control oil discharged in various ways. This control oil valve (not shown) may be in the form of a screw.

[0044] That is, the electro-hydraulic converter (11) can be corrected through a control oil valve (not shown). The correction value can be the rotation value or opening value of the control oil valve (not shown).

[0045]

[0046] The auto-tuning device according to the present embodiment inputs an electric command signal to an electro-hydraulic converter (11) and receives measurement signals measured from various sensors. The auto-tuning device can then calculate a correction value for a control oil valve (not shown) of the electro-hydraulic converter (11) using the measurement signals measured from various sensors.

[0047] To be more specific, the auto tuning device includes a first pressure measuring sensor (110), a second pressure measuring sensor (120), an oil temperature sensor (130), a displacement measuring sensor (140), and a control unit (200).

[0048] The first pressure measuring sensor (110) measures the pressure of the control oil of the electro-hydraulic converter (11) operated by an electric command signal. That is, the first pressure measuring sensor (110) measures the pressure of the control oil flowing from the electro-hydraulic converter (11) to the servo motor.

[0049] The second pressure measurement sensor (120) measures the pressure of the supply oil input to the electro-hydraulic converter (11). The pressure value of the supply oil flowing into the electro-hydraulic converter (11) is important for the calibration of the electro-hydraulic converter (11). Since the calibration value of the electro-hydraulic converter (11) may vary depending on the pressure of the supply oil input, the pressure of the supply oil must be maintained within a predetermined range. Therefore, the second pressure measurement sensor (120) measures the pressure of the supply oil in order to maintain the pressure of the supply oil within a predetermined range.

[0050] The oil temperature sensor (130) measures the temperature of the control oil flowing into the electro-hydraulic converter (11). The temperature of the control oil flowing into the electro-hydraulic converter (11) is important for the calibration of the electro-hydraulic converter (11). Since the adjustment value of the control oil valve (not shown) may vary depending on the temperature of the control oil flowing in, the temperature of the supplied oil must be maintained within a predetermined range. Therefore, the oil temperature sensor (130) measures the temperature of the supplied oil in order to maintain the temperature of the supplied oil within a predetermined range.

[0051] The displacement measuring sensor (140) receives hydraulic pressure of the control oil of the electro-hydraulic converter (11) and measures the displacement (movement) of the servo motor (12) that moves the actuator to open and close the valve of the turbine.

[0052] The displacement measurement sensor (140) may include at least two types of sensors in order to select a sensor suitable for the field situation. For example, the displacement measurement sensor (140) may include at least one of a laser displacement measurement sensor (141) and a Linear Variable Displacement Transducer (hereinafter referred to as 'LVDT') (142), or may include both. Of course, the displacement measurement sensor (140) is not limited thereto, and any device capable of measuring the displacement of the servo motor (12) and converting it into an electrical signal is possible. Hereinafter, the displacement measurement sensor (140) is described as including a laser displacement measurement sensor (141) and an LVDT (142).

[0053] Meanwhile, the auto-tuning device may further include a contamination sensor (150) that measures the contamination level of the control oil. More specifically, the contamination sensor (150) may measure the contamination level of the control oil flowing into the electro-hydraulic converter (11). For example, the contamination sensor (150) may sense moisture, contamination level, etc. Of course, the present invention is not limited thereto, and the contamination sensor (150) may sense various items such as viscosity, life / deterioration level, acid value, and color.

[0054] Referring to Fig. 3, the control unit (200) of the auto-tuning device will be described. The control unit (200) can receive measurement signals from the first pressure measurement sensor (110), the second pressure measurement sensor (120), the oil temperature sensor (130), and the displacement measurement sensor (140), and determine whether the electro-hydraulic converter (11) is to be corrected. Additionally, the control unit (200) can receive a signal from a contamination sensor (150).

[0055] The control unit (200) can determine that correction of the electro-hydraulic converter (11) is necessary when the pressure of the first pressure measurement sensor (110) according to the electric command signal is out of a predetermined range or when the displacement measurement value (measurement data of the displacement measurement sensor (140)) of the servo motor (12) according to the pressure of the first pressure measurement sensor (110) is out of a predetermined range.

[0056] In addition, the control unit (200) can receive measurement signals from the second pressure measurement sensor (120) and the oil temperature sensor (130), determine whether the supplied oil exists within a predetermined pressure range and a predetermined temperature range, and transmit an electric command signal to the electro-hydraulic converter (11). If the pressure and temperature of the supplied oil exceed or fall below the predetermined range, respectively, an alarm can be generated to adjust the pressure or the temperature.

[0057] That is, the control unit (200) can transmit an electric command signal to the electro-hydraulic converter (11) when the pressure received from the second pressure measurement sensor (120) is within a predetermined range (e.g., 23 to 27 bar) and the temperature received from the oil temperature sensor (130) is within a predetermined range (e.g., 40 to 60°C). If it is outside the above range, an alarm can be sent to the operator or manager.

[0058] To explain in more detail, the control unit (200) may include at least one of a tuning condition confirmation unit (211), a major valve selection unit (212), an electric command signal setting unit (213), a guideline setting unit (214), a correction work START / STOP unit (216), a measurement value output unit (217), a graph output unit (218), a tuning calculation unit (219), an error judgment unit (220), a reporter output unit (221), a database unit (222), an artificial intelligence unit (223), and a correction value calculation unit (224).

[0059] The tuning condition confirmation unit (211) determines whether the pressure and temperature of the supplied oil are within the aforementioned predetermined range from the second pressure measurement sensor (120) and the oil temperature sensor (130). If the pressure and temperature are outside the predetermined range, an alarm is sent to the operator.

[0060] The major valve selection unit (212) can directly input information on the major valve to be corrected or select it from pre-registered information.

[0061] The electric command signal setting unit (213) sets the range of the electric command signal provided to the electro-hydraulic converter (11). More specifically, the electric command signal setting unit (213) sets the electric command signal so that the voltage of 0 to 7 V changes sequentially or linearly.

[0062] In addition, the electric command signal setting unit (213) can select the output waveform from among Dwell (output and maintenance at a specified value), Ramp (output at a specified speed up to a target value), and Block (combination of Dwell and Ramp).

[0063] The guideline setting unit (214) can set guidelines for the correction work graph. More specifically, the guideline setting unit (214) can set guidelines for the allowable range of control oil pressure for an electric command signal and the allowable range of displacement for the control oil pressure in order to determine the status during the correction work. At this time, the pressure of the control oil is measured by the first pressure measuring sensor (110), and the displacement for the pressure of the control oil is measured by the displacement measuring sensor (140). The guidelines are different for each major valve.

[0064] The correction work START / STOP unit (216) can automatically provide and stop the electric command signal set in the electric command signal setting unit (120) to the electric-hydraulic converter (11). When START is selected at the start of the correction work, the set electric command signal is provided to the electric-hydraulic converter (11), and when the electric command signal reaches the target signal, the provision of the electric command signal is automatically stopped.

[0065] In more detail, the correction work START / STOP unit (216) sequentially provides electric command signals to the electro-hydraulic converter (11) so that the electro-hydraulic converter (11) converts the electric command signal into a hydraulic signal of control oil pressure. At this time, the correction work START / STOP unit (216) sequentially provides electric command signals to the electro-hydraulic converter (11) so that the voltage automatically increases at regular intervals according to the electric signal set in the electric command signal setting unit (213). For example, the correction work START / STOP unit transmits an electric command signal from 0 V to 7 V to the electro-hydraulic converter (11) at the start.

[0066] The measurement value output unit (217) outputs in real time the electric command signal provided to the electro-hydraulic converter (11) from the start to the end of the correction work START / STOP unit (216), and also automatically outputs in real time the pressure of the control oil and the displacement of the servo motor (12). At this time, the pressure of the control oil is measured by the first pressure measurement sensor (110), and the displacement for the pressure of the control oil is measured by the displacement measurement sensor (140). The auto-tuning device may include a display or a printer, and may output the measurement value to the display or to paper. Alternatively, the auto-tuning device may output to a file.

[0067] The graph output unit (218) outputs a graph (Fig. 4a) of the pressure of the control oil versus the electric command signal provided to the electro-hydraulic converter (11) from the start to the end of the correction work START / STOP unit (216), and automatically outputs a graph (Fig. 4b) of the displacement of the servo motor (12) versus the control oil pressure. At this time, the guideline set in the graph guideline setting unit (214) is displayed together with each graph, so that the status of the correction work can be checked. The auto-tuning device can include a display or a printer, and output the graph to the display or to paper. Alternatively, the auto-tuning device can also output to a file.

[0068] The tuning calculation unit (219) calculates and outputs tuning parameters of the electro-hydraulic converter (11) using information of the major valve, measurement information of the first pressure measurement sensor (110) and displacement measurement sensor (140), and automatically calculates Hysteresis and Deviation values. The tuning parameters are factors for tuning the control signals input to the major valve during operation of the power plant turbine. That is, the control signal before the correction work is tuned by the tuning parameters and transmitted to the major valve. The power plant controller receives the tuning parameters from the tuning calculation unit (219) and tunes the control signals.

[0069] In more detail, the tuning calculation unit (219) can automatically calculate the Hysteresis and Deviation values ​​after the calibration work is completed and automatically terminated in the calibration work START / STOP unit (216). At this time, the tuning calculation unit (219) automatically calculates the tuning parameters simultaneously using the characteristic data of the major valve, the measurement information of the first pressure measurement sensor (110), and the displacement measurement sensor (140).

[0070] The error judgment unit (220) outputs an alarm when the hysteresis and deviation values ​​calculated by the tuning calculation unit (219) exceed or fall below the aforementioned guidelines. At this time, the auto-tuning device may include a display, and may alarm through a change in screen brightness or color or a warning window. Alternatively, the auto-tuning device may include a speaker, and may alarm with sound.

[0071] The reporter output unit (221) can automatically output a report including a graph of the control oil pressure versus the electric command signal provided to the electro-hydraulic converter (11) after the correction work of the major valve is completed (Fig. 4a), a graph of the displacement of the servo motor (12) versus the control oil pressure (Fig. 4b), and characteristic data (information on the major valve) and tuning parameters of the major valve. The auto-tuning device can include a display or a printer, and output the graph to the display or to paper. Alternatively, the auto-tuning device can output to a file.

[0072] Additionally, the control unit (200) may further include a displacement measurement sensor selection unit (215).

[0073] As described above, the displacement measurement sensor (140) includes at least two types of displacement measurement sensors (140). For example, the displacement measurement sensor (140) includes a laser displacement measurement sensor (141) and an LVDT (142). Therefore, the displacement measurement sensor selection unit (215) can select from among the laser displacement measurement device (141) or the LVDT (142).

[0074]

[0075] Meanwhile, according to another embodiment of the present invention, the auto-tuning device can train artificial intelligence and predict correction values ​​and tuning parameters using the learning results. To this end, the control unit (200) includes a database unit (222), an artificial intelligence learning unit (223), and a correction value calculation unit (224).

[0076] The database section (222) stores information of the major valve (e.g., characteristic information or reference slope), measurement information of the first pressure measurement sensor (110), the second pressure measurement sensor (120), the displacement measurement sensor (140), and the oil temperature sensor (130), and stores tuning parameters according to the measurement information and correction values ​​of the control oil valve (not shown) of the electro-hydraulic converter (11).

[0077] Here, the reference slope is the specification of the major valve, so a detailed explanation is omitted.

[0078] The artificial intelligence learning unit (223) trains the artificial intelligence using information of the major valve, measurement information of the first pressure measurement sensor (110), the second pressure measurement sensor (120), the displacement measurement sensor (140), and the oil temperature sensor (130), and the correction value of the control oil valve (not shown) according to the measurement information.

[0079] For example, a multi-layer perceptron model (MLP) is applied, and the input layer and output layer collected over a certain period of time are set.

[0080] Here, the input layer is information about the major valve, measurement information about the first pressure measurement sensor (110), the second pressure measurement sensor (120), the displacement measurement sensor (140), and the oil temperature sensor (130). The output layer is the calibration value of the electro-hydraulic converter (11). Then, two or more hidden layers are set.

[0081] The correction value calculation unit (224) calculates the correction value using the artificial intelligence learned in the artificial intelligence learning unit (223). For example, information on the major valve, measurement signals from the first pressure measurement sensor (110), the second pressure measurement sensor (120), the displacement measurement sensor (140), and the oil temperature sensor (130) are input into the correction value calculation unit (224). Then, the correction value calculation unit (224) inputs the above factors into the artificial intelligence to calculate the correction value of the control oil valve.

[0082] In particular, since the correction value is affected by the temperature and pressure of the supply oil, the temperature and pressure of the supply oil had to be precisely set. However, according to the present embodiment, reliable correction values ​​can be derived using artificial intelligence without having to precisely set the temperature and pressure of the supply oil.

[0083]

[0084] Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention will be able to easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same spirit, but this will also be considered to fall within the spirit of the present invention.

Claims

1. A first pressure measurement sensor that measures the pressure of control oil flowing from an electro-hydraulic converter to a servo motor according to an electric command signal; A second pressure measurement sensor for measuring the pressure of the supply oil input to the electro-hydraulic converter; An oil temperature sensor that measures the temperature of the supply oil input to the electro-hydraulic converter; A displacement measuring sensor that receives control oil pressure of the above electro-hydraulic converter and measures the displacement of a servo motor that moves an actuator to open and close a major valve; A control unit that receives measurement signals from the first pressure measurement sensor, the second pressure measurement sensor, the oil temperature sensor, and the variation measurement sensor, and determines whether the electro-hydraulic converter is corrected; An electro-hydraulic converter for controlling a major valve of a power plant turbine, including an auto-tuning device for a servo motor.

2. In paragraph 1, The above control unit, An auto-tuning device for an electro-hydraulic converter and a servo motor for controlling a major valve of a power plant turbine, which determines that correction of the electro-hydraulic converter is necessary when the pressure of the first pressure measurement sensor according to the electric command signal is out of a predetermined range or the displacement of the servo motor according to the pressure of the first pressure measurement sensor is out of a predetermined range.

3. In paragraph 1, The above control unit, An electro-hydraulic converter for controlling a major valve of a power plant turbine and an auto-tuning device for a servo motor, which transmits the electric command signal to the electro-hydraulic converter when the pressure of the supply oil received from the second pressure measuring sensor is within a predetermined range and the temperature of the supply oil received from the oil temperature sensor is within a predetermined range.

4. In paragraph 1, The above control unit, A tuning condition confirmation unit that determines whether the pressure and temperature of the control oil are within the aforementioned predetermined range from the second pressure measurement sensor and the oil temperature sensor; Major valve selection section for directly entering information about the major valve or selecting from pre-registered information; An electric command signal setting unit that sets an electric command signal in which a voltage of 0 to 7 V is sequentially provided to the above-mentioned electric-hydraulic converter; A guideline setting unit that sets guidelines for an allowable range for the control oil pressure measured by the first pressure measuring sensor for the electric command signal and an allowable range for the displacement measured by the displacement measuring sensor; A START / STOP unit for corrective work that sequentially provides the electric command signal to the electro-hydraulic converter so that the electro-hydraulic converter converts the electric command signal into a hydraulic signal of control oil pressure; A measurement value output unit that outputs in real time the electric command signal, the pressure of the control oil measured by the first pressure sensor according to the electric command signal, and the displacement of the servo motor according to the pressure of the control oil; A graph output unit that outputs a graph of the pressure of the control oil in comparison with the electric command signal and automatically outputs a graph of the displacement of the servo motor in comparison with the pressure of the control oil; A tuning calculation unit that automatically calculates Hysteresis and Deviation values ​​using information of the major valve, measurement information of the first pressure measurement sensor, and the displacement measurement sensor, and outputs tuning parameters of the electro-hydraulic converter; An electro-hydraulic converter for controlling a major valve of a power plant turbine, including an auto-tuning device for a servo motor.

5. In paragraph 4, The above control unit, An error judgment unit that outputs an alarm when the Hysteresis and Deviation values ​​calculated in the above tuning calculation unit exceed the allowable range; An electro-hydraulic converter for controlling a major valve of a power plant turbine, and an auto-tuning device for a servo motor, further comprising:

6. In paragraph 4, The above control unit, A reporter output section that outputs the graph output from the graph output section, information on the major valve, and the tuning parameters; An electro-hydraulic converter for controlling a major valve of a power plant turbine, and an auto-tuning device for a servo motor, further comprising:

7. In paragraph 4, The above control unit, A displacement measurement sensor selection unit for selecting at least one of at least two types of displacement measurement sensors; An electro-hydraulic converter for controlling a major valve of a power plant turbine, and an auto-tuning device for a servo motor, further comprising:

8. In paragraph 1, The above control unit, A database section storing information of a major valve, measurement information of a first pressure measurement sensor, a second pressure measurement sensor, a displacement measurement sensor, and an oil temperature sensor, and storing a correction value of a control oil valve; and An artificial intelligence learning unit that trains artificial intelligence with the information of the major valve, the measurement information, and the correction value; and A correction value calculation unit that inputs information of the major valve, measurement information of the first pressure measurement sensor, the second pressure measurement sensor, the displacement measurement sensor, and the oil temperature sensor into the learned artificial intelligence to calculate a correction value of the control oil; An electro-hydraulic converter for controlling a major valve of a power plant turbine, and an auto-tuning device for a servo motor, further comprising:

9. In paragraph 8, The above artificial intelligence learning unit, An electro-hydraulic converter and auto-tuning device for a servo motor for controlling a major valve of a power plant turbine, which applies a multi-layer perceptron (MLP) model, sets the input layer as information of a major valve, measurement information of a first pressure measurement sensor, a second pressure measurement sensor, a displacement measurement sensor, and an oil temperature sensor, and sets the output layer as a correction value.

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