A control system for steam turbine valves

Abstract

The present invention relates to the technical field of steam turbines, and discloses a control system for steam turbine valves, comprising: a first calculation module, a second calculation module, a valve correction module and a valve control module. The first calculation module obtains the real-time steam flow and the required steam flow of the steam turbine valve, determines whether to adjust the valve opening, and if so, determines the initial valve opening according to the real-time steam flow and the required steam flow; the second calculation module collects characteristic parameters of the steam turbine, and determines whether the steam turbine has an operating abnormality, and if so, calculates the abnormal fluctuation index according to the speed set and the load set; the valve correction module corrects the initial valve opening according to the abnormal fluctuation index to obtain the target valve opening; the valve control module controls according to the target valve opening. The present invention can perform intelligent control on the steam turbine valve, avoid errors caused by manual participation, improve control accuracy, and ensure the working stability and reliability of the steam turbine.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a control system for steam turbine valves. Background Art

[0002] Steam turbine valves are key components for regulating the steam flow into the steam turbine, and are essential for controlling the speed and load of the steam turbine. The steam turbine control system controls the steam flow into the steam turbine by adjusting the valve opening, thereby adjusting the speed and load of the steam turbine. This control method ensures that the steam turbine can operate stably according to the grid demand or process requirements. Steam turbine valves are an important part of ensuring the normal operation of the steam turbine, and its design and operation have a direct impact on the performance of the steam turbine.

[0003] Under ideal design conditions, the actual demand of the steam turbine is linearly related to the steam flow injection. However, since the steam turbine may be unstable when it is turned on or off, this will cause the steam flow injection to fluctuate, and the steam flow required to maintain the actual demand of the steam turbine will also be different. In the existing technology, it is generally adjusted by trial and error by experienced staff, that is, manually adjusting slowly based on experience. However, the current manual trial and error adjustment method requires extremely high personal knowledge and experience, and needs to be repeated many times, which is time-consuming, which is prone to setting deviations and cannot perform intelligent control of the steam turbine valve. Summary of the invention

[0004] In view of this, the present invention proposes a control system for a steam turbine valve, aiming to solve the problem in the current technology that the steam turbine valve cannot be intelligently controlled and the control error existing in manual participation cannot be reduced.

[0005] The present invention proposes a control system for a steam turbine valve, comprising:

[0006] A first calculation module is used to obtain a real-time steam flow rate and a required steam flow rate of a steam turbine valve, and determine whether to adjust the valve opening of the steam turbine valve according to the real-time steam flow rate and the required steam flow rate, and if so, determine an initial valve opening of the steam turbine valve according to the real-time steam flow rate and the required steam flow rate;

[0007] A second calculation module is used to collect characteristic parameters of the steam turbine within a preset time period, and determine whether the steam turbine has an operation abnormality based on the characteristic parameters. If so, a speed set and a load set are constructed based on the characteristic parameters, and an abnormal fluctuation index of the steam turbine is calculated according to the speed set and the load set, wherein the characteristic parameters include the speed of the steam turbine and the load of the steam turbine;

[0008] A valve correction module, used for correcting the initial valve opening of the steam turbine valve according to the abnormal fluctuation index to obtain a target valve opening of the steam turbine valve;

[0009] A valve control module is used to control the turbine valve according to the target valve opening.

[0010] Furthermore, the first calculation module is used to calculate the steam flow ratio of the real-time steam flow and the required steam flow;

[0011] The first calculation module is used for determining not to adjust the valve opening of the steam turbine valve when the steam flow ratio is greater than or equal to 1;

[0012] The first calculation module is used for determining whether to adjust the valve opening of the steam turbine valve when the steam flow ratio is less than 1, and calculating the steam flow difference between the real-time steam flow and the required steam flow;

[0013] The first calculation module is used to calculate the valve opening adjustment factor of the steam turbine valve according to the steam flow difference, and adjust the valve opening of the steam turbine valve based on the valve opening adjustment factor to obtain the initial valve opening.

[0014] Furthermore, the first calculation module calculates the valve opening adjustment factor of the steam turbine valve according to the following formula:

[0015]

[0016] Among them, q is the valve opening adjustment factor of the turbine valve, and a is the steam flow difference.

[0017] Furthermore, the second calculation module is used to collect characteristic parameters of the steam turbine within a preset time period, wherein the characteristic parameters include the speed of the steam turbine and the load of the steam turbine;

[0018] The second calculation module is used to construct a speed set according to all speeds, and to construct a load set according to all loads;

[0019] The second calculation module is used to obtain a preset standard speed and standard load;

[0020] The second calculation module is used to determine whether there is a speed less than the standard speed in the speed set, and if so, generate a first abnormal signal, and determine whether there is a load less than the standard load in the load set, and if so, generate a second abnormal signal;

[0021] The second calculation module is used for determining that the steam turbine has an operating abnormality when the first abnormal signal and the second abnormal signal are identified;

[0022] The second calculation module is used to generate a non-abnormal speed set according to all speeds in the speed set that are greater than or equal to the standard speed, and to generate an abnormal speed set according to the remaining speeds;

[0023] The second calculation module is used to generate a non-abnormal load set according to all loads in the load set that are greater than or equal to the standard load, and to generate an abnormal load set according to the remaining loads;

[0024] The second calculation module is used to calculate the average speed of the non-abnormal speed set and the average load of the non-abnormal load set respectively;

[0025] The second calculation module is used to calculate the abnormal fluctuation index of the steam turbine according to the abnormal speed set, the abnormal load set, the speed average value and the load average value.

[0026] Furthermore, the second calculation module calculates the abnormal fluctuation index of the steam turbine according to the following formula:

[0027]

[0028] Among them, E is the abnormal fluctuation index of the turbine, n1 is the number of speeds in the abnormal speed set, bi 1 is the i 1th speed in the abnormal speed set, b is the average speed, n2 is the number of loads in the abnormal load set, c i2 is the i 2th load in the abnormal load set, c is the average load, bmax is the maximum speed in the abnormal speed set, cmax is the maximum load in the abnormal load set, u1 is the weight corresponding to the speed, u2 is the weight corresponding to the load, and u1+u2=1.

[0029] Furthermore, the valve correction module is used to obtain the initial valve opening P of the steam turbine valve;

[0030] The valve correction module is used to preset a first preset abnormal fluctuation index G1 and a second preset abnormal fluctuation index G2, and G1<G2;

[0031] The valve correction module is used to preset a first preset valve opening correction coefficient h1, a second preset valve opening correction coefficient h2, and a third preset valve opening correction coefficient h3, and 0.8

[0032] ​The valve correction module is used to correct the initial valve opening P of the steam turbine valve according to the relationship between the abnormal fluctuation index E of the steam turbine and each preset abnormal fluctuation index, so as to obtain the target valve opening of the steam turbine valve;

[0033] Based on the comparison result of the first abnormal fluctuation index, the first preset valve opening correction coefficient h1 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h1 of the steam turbine valve;

[0034] Based on the comparison result of the second abnormal fluctuation index, the second preset valve opening correction coefficient h2 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h2 of the steam turbine valve;

[0035] Based on the comparison result of the third abnormal fluctuation index, the third preset valve opening correction coefficient h3 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h3 of the steam turbine valve;

[0036] Among them, the comparison result of the first abnormal fluctuation index is E<G1, the comparison result of the second abnormal fluctuation index is G1≤E<G2, and the comparison result of the third abnormal fluctuation index is G2≤E.

[0037] Furthermore, the valve control module comprises:

[0038] A first acquisition module, used to acquire the steam temperature and steam pressure of the steam turbine valve;

[0039] A second acquisition module is used to acquire a preset steam temperature range and a steam pressure range;

[0040] A judgment module, used for judging whether the steam temperature and the steam pressure are both within the steam temperature range and the steam pressure range;

[0041] A control module, configured to control the steam turbine valve according to the target valve opening when the steam temperature and the steam pressure are both within the steam temperature range and the steam pressure range;

[0042] A compensation module is used to compensate the target valve opening of the steam turbine valve according to the steam temperature and the steam pressure when one or both of the steam temperature and the steam pressure are not within the steam temperature range and the steam pressure range, and control the steam turbine valve according to the compensated target valve opening.

[0043] Further, the compensation module is used to evaluate the steam temperature based on a pre-trained steam temperature evaluation model to obtain a first evaluation value F1;

[0044] The compensation module is used to evaluate the steam pressure based on a pre-trained steam pressure evaluation model to obtain a second evaluation value F2;

[0045] The compensation module is used to calculate an evaluation sum value F of the first evaluation value F1 and the second evaluation value F2, and compensate the target valve opening of the steam turbine valve according to the evaluation sum value F.

[0046] Further, the compensation module is used to preset a first preset evaluation and value W1 and a second preset evaluation and value W2, and W1<W2;

[0047] The compensation module is used to preset a first preset valve opening compensation coefficient y1, a second preset valve opening compensation coefficient y2, and a third preset valve opening compensation coefficient y3, and 0.8<y1<y2<y3<1.2;

[0048] When the target valve opening of the steam turbine valve is set to P*hi, i=1, 2, 3, the compensation module is used to compensate the target valve opening P*hi of the steam turbine valve according to the relationship between the evaluation value F and each preset evaluation value:

[0049] Under the first evaluation and value comparison result, the third preset valve opening compensation coefficient y3 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y3;

[0050] Under the second evaluation and value comparison result, the second preset valve opening compensation coefficient y2 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y2;

[0051] Based on the third evaluation and value comparison result, the first preset valve opening compensation coefficient y1 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y1;

[0052] Among them, the first evaluation and value comparison result is F<W1, the second evaluation and value comparison result is W1≤F<W2, and the third evaluation and value comparison result is W2≤F.

[0053] Furthermore, it also includes:

[0054] The alarm module is used to monitor the abnormality of the steam turbine valve and issue an alarm in real time when the steam turbine valve is abnormal.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The invention discloses a control system for a steam turbine valve, comprising: a first calculation module, a second calculation module, a valve correction module and a valve control module. The first calculation module obtains the real-time steam flow and the required steam flow of the steam turbine valve, determines whether to adjust the valve opening, and if so, determines the initial valve opening according to the real-time steam flow and the required steam flow; the invention can realize the initial determination of the valve opening through the real-time steam flow and the required steam flow, and lays the foundation for the subsequent correction of the valve opening; the second calculation module collects the characteristic parameters of the steam turbine, and determines whether the steam turbine has an abnormal operation, and if so, calculates the abnormal fluctuation index according to the speed set and the load set; the valve correction module corrects the initial valve opening according to the abnormal fluctuation index to obtain the target valve opening; the valve control module controls the steam turbine valve according to the target valve opening. By calculating the abnormal fluctuation index, the abnormal fluctuation caused by the abnormal speed and abnormal load of the steam turbine can be solved, the control accuracy can be improved, and then the intelligent control of the steam turbine valve can be realized, the error existing in manual participation can be avoided, and the working stability and reliability of the steam turbine can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0058] Figure 1 A schematic diagram of the structure of a control system for a steam turbine valve provided by an embodiment of the present invention;

[0059] Figure 2 A schematic diagram of the structure of a valve control module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0060] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0061] like Figure 1 As shown, in some embodiments of the present application, this embodiment provides a control system for a steam turbine valve, including: a first calculation module, a second calculation module, a valve correction module and a valve control module.

[0062] In some embodiments of the present application, a first calculation module is used to obtain the real-time steam flow and the required steam flow of the turbine valve, and determine whether to adjust the valve opening of the turbine valve according to the real-time steam flow and the required steam flow; if so, determine the initial valve opening of the turbine valve according to the real-time steam flow and the required steam flow; a second calculation module is used to collect characteristic parameters of the turbine within a preset time period, and determine whether the turbine has an operating abnormality based on the characteristic parameters; if so, calculate the abnormal fluctuation index of the turbine based on the characteristic parameters; a valve correction module is used to correct the initial valve opening of the turbine valve according to the abnormal fluctuation index to obtain a target valve opening of the turbine valve; and a valve control module is used to control the turbine valve according to the target valve opening.

[0063] In this embodiment, the real-time steam flow of the steam turbine valve can be obtained according to the flow detection instrument.

[0064] In this embodiment, the preset time period can be set according to actual needs, such as being set to 10 minutes or 20 minutes.

[0065] The beneficial effect of the above technical solution is that the present invention can perform intelligent control on the steam turbine valve, avoid errors caused by human participation, improve control accuracy, and ensure the working stability and reliability of the steam turbine.

[0066] In some embodiments of the present application, the first computing module is specifically used to:

[0067] The first calculation module is used to calculate the steam flow ratio of the real-time steam flow and the required steam flow;

[0068] The first calculation module is used for determining not to adjust the valve opening of the steam turbine valve when the steam flow ratio is greater than or equal to 1;

[0069] The first calculation module is used for determining whether to adjust the valve opening of the steam turbine valve when the steam flow ratio is less than 1, and calculating the steam flow difference between the real-time steam flow and the required steam flow;

[0070] The first calculation module is used to calculate the valve opening adjustment factor of the steam turbine valve according to the steam flow difference, and adjust the valve opening of the steam turbine valve based on the valve opening adjustment factor to obtain the initial valve opening.

[0071] In this embodiment, when calculating the valve opening adjustment factor of the steam turbine valve according to the steam flow rate difference, the steam flow rate difference takes an absolute value.

[0072] In this embodiment, the product value of the valve opening and the valve opening adjustment factor is used as the initial valve opening.

[0073] The beneficial effect of the above technical solution is: the present invention calculates the valve opening adjustment factor of the turbine valve according to the steam flow difference, and adjusts the valve opening of the turbine valve based on the valve opening adjustment factor to obtain the initial valve opening, which can ensure the adjustment accuracy of the turbine valve and avoid large errors.

[0074] In some embodiments of the present application, the first computing module is specifically used to:

[0075] The first calculation module is used to calculate the valve opening adjustment factor of the steam turbine valve according to the following formula:

[0076]

[0077] Among them, q is the valve opening adjustment factor of the turbine valve, and a is the steam flow difference.

[0078] In some embodiments of the present application, the second computing module is specifically used for:

[0079] The second calculation module is used to collect characteristic parameters of the steam turbine within a preset time period, wherein the characteristic parameters include the speed of the steam turbine and the load of the steam turbine;

[0080] The second calculation module is used to construct a speed set according to all speeds, and to construct a load set according to all loads;

[0081] The second calculation module is used to obtain a preset standard speed and standard load;

[0082] The second calculation module is used to determine whether there is a speed less than the standard speed in the speed set, and if so, generate a first abnormal signal, and determine whether there is a load less than the standard load in the load set, and if so, generate a second abnormal signal;

[0083] The second calculation module is used for determining that the steam turbine has an operating abnormality when the first abnormal signal and the second abnormal signal are identified;

[0084] The second calculation module is used to generate a non-abnormal speed set according to all speeds in the speed set that are greater than or equal to the standard speed, and to generate an abnormal speed set according to the remaining speeds;

[0085] The second calculation module is used to generate a non-abnormal load set according to all loads in the load set that are greater than or equal to the standard load, and to generate an abnormal load set according to the remaining loads;

[0086] The second calculation module is used to calculate the average speed of the non-abnormal speed set and the average load of the non-abnormal load set respectively;

[0087] The second calculation module is used to calculate the abnormal fluctuation index of the steam turbine according to the abnormal speed set, the abnormal load set, the speed average value and the load average value.

[0088] In this embodiment, the standard speed and the standard load can be set according to the corresponding steam turbine, and are not specifically limited here.

[0089] In this embodiment, when the first abnormal signal and the second abnormal signal are identified, it is judged that the steam turbine has an operating abnormality. Here, it means that the first abnormal signal and the second abnormal signal are identified at the same time. When the first abnormal signal or the second abnormal signal is identified, it is judged that the steam turbine does not have an operating abnormality.

[0090] In this embodiment, when the speed and load of the steam turbine continue to meet the corresponding range, the abnormal fluctuation index is smaller, and the impact on the steam turbine valve is smaller. Conversely, when the speed and load of the steam turbine continue to fail to meet the corresponding range, the abnormal fluctuation index is larger, and the impact on the steam turbine valve is greater. The abnormal fluctuation index is a value to measure whether the steam turbine is operating stably.

[0091] The beneficial effect of the above technical solution is: the present invention calculates the abnormal fluctuation index of the turbine based on the abnormal speed set, the abnormal load set, the speed average value and the load average value. By calculating the abnormal fluctuation index of the turbine, it can lay the foundation for the correction of the turbine valve and further ensure the accuracy of the turbine valve.

[0092] In some embodiments of the present application, the second computing module is specifically used for:

[0093] The second calculation module is used to calculate the abnormal fluctuation index of the steam turbine according to the following formula:

[0094]

[0095] Among them, E is the abnormal fluctuation index of the turbine, n1 is the number of speeds in the abnormal speed set, bi 1 is the i 1th speed in the abnormal speed set, b is the average speed, n2 is the number of loads in the abnormal load set, c i2 is the i 2th load in the abnormal load set, c is the average load, bmax is the maximum speed in the abnormal speed set, cmax is the maximum load in the abnormal load set, u1 is the weight corresponding to the speed, u2 is the weight corresponding to the load, and u1+u2=1.

[0096] In some embodiments of the present application, the valve correction module is used to obtain the initial valve opening P of the steam turbine valve;

[0097] The valve correction module is used to preset a first preset abnormal fluctuation index G1 and a second preset abnormal fluctuation index G2, and G1<G2;

[0098] The valve correction module is used to preset a first preset valve opening correction coefficient h1, a second preset valve opening correction coefficient h2, and a third preset valve opening correction coefficient h3, and 0.8

[0099] The valve correction module is used to correct the initial valve opening P of the steam turbine valve according to the relationship between the abnormal fluctuation index E of the steam turbine and each preset abnormal fluctuation index, so as to obtain the target valve opening of the steam turbine valve;

[0100] Based on the comparison result of the first abnormal fluctuation index, the first preset valve opening correction coefficient h1 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h1 of the steam turbine valve;

[0101] Based on the comparison result of the second abnormal fluctuation index, the second preset valve opening correction coefficient h2 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h2 of the steam turbine valve;

[0102] Based on the comparison result of the third abnormal fluctuation index, the third preset valve opening correction coefficient h3 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h3 of the steam turbine valve;

[0103] ​Among them, the comparison result of the first abnormal fluctuation index is E<G1, the comparison result of the second abnormal fluctuation index is G1≤E<G2, and the comparison result of the third abnormal fluctuation index is G2≤E.

[0104] In this embodiment, the first preset abnormal fluctuation index G1 is 1.8, and the second preset abnormal fluctuation index G2 is 2.4.

[0105] In this embodiment, the first preset valve opening correction coefficient h1 is 0.9, the second preset valve opening correction coefficient h2 is 1, and the third preset valve opening correction coefficient h3 is 1.1.

[0106] The beneficial effect of the above technical solution is: the present invention corrects the initial valve opening P of the turbine valve according to the relationship between the abnormal fluctuation index E of the turbine and each preset abnormal fluctuation index, and obtains the target valve opening of the turbine valve, which can ensure that the speed and load of the turbine meet the corresponding speed range and load range, ensure the operating reliability and stability of the turbine, and improve work efficiency.

[0107] like Figure 2 As shown, in some embodiments of the present application, the valve control module includes:

[0108] A first acquisition module, used to acquire the steam temperature and steam pressure of the steam turbine valve;

[0109] A second acquisition module is used to acquire a preset steam temperature range and a steam pressure range;

[0110] A judgment module, used for judging whether the steam temperature and the steam pressure are both within the steam temperature range and the steam pressure range;

[0111] A control module, configured to control the steam turbine valve according to the target valve opening when the steam temperature and the steam pressure are both within the steam temperature range and the steam pressure range;

[0112] A compensation module is used to compensate the target valve opening of the steam turbine valve according to the steam temperature and the steam pressure when one or both of the steam temperature and the steam pressure are not within the steam temperature range and the steam pressure range, and control the steam turbine valve according to the compensated target valve opening.

[0113] In this embodiment, the steam temperature and steam pressure of the steam turbine valve can be obtained according to the temperature detection instrument and the pressure detection instrument.

[0114] In this embodiment, the steam temperature range and the steam pressure range are set according to actual conditions.

[0115] The beneficial effect of the above technical solution is that the present invention compensates for the target valve opening of the turbine valve according to the steam temperature and the steam pressure, and controls the turbine valve according to the compensated target valve opening, which can further ensure the control accuracy of the turbine valve and avoid the steam temperature and steam pressure being too low, which affects the steam delivery speed and delivery volume.

[0116] In some embodiments of the present application, the compensation module is specifically used for:

[0117] The compensation module is used to evaluate the steam temperature based on a pre-trained steam temperature evaluation model to obtain a first evaluation value F1;

[0118] The compensation module is used to evaluate the steam pressure based on a pre-trained steam pressure evaluation model to obtain a second evaluation value F2;

[0119] The compensation module is used to calculate an evaluation sum value F of the first evaluation value F1 and the second evaluation value F2, and compensate the target valve opening of the steam turbine valve according to the evaluation sum value F.

[0120] In this embodiment, the steam temperature evaluation model is pre-trained, and is obtained through training based on different data samples and evaluation values ​​matched with the data samples.

[0121] In this embodiment, the steam pressure evaluation model is pre-trained, and is obtained through training based on different data samples and evaluation values ​​matched with the data samples.

[0122] In this embodiment, when the steam temperature is higher, the corresponding evaluation value is larger, and when the steam pressure is higher, the corresponding evaluation value is larger.

[0123] The beneficial effect of the above technical solution is that the present invention compensates the target valve opening of the turbine valve according to the evaluation and value F of the first evaluation value F1 and the second evaluation value F2, and can comprehensively consider the steam temperature and steam pressure to improve the control efficiency of the turbine valve.

[0124] In some embodiments of the present application, the compensation module is specifically used for:

[0125] The compensation module is used to preset a first preset evaluation and value W1 and a second preset evaluation and value W2, and W1<W2;

[0126] The compensation module is used to preset a first preset valve opening compensation coefficient y1, a second preset valve opening compensation coefficient y2, and a third preset valve opening compensation coefficient y3, and 0.8<y1<y2<y3<1.2;

[0127] When the target valve opening of the steam turbine valve is set to P*hi, i=1, 2, 3, the compensation module is used to compensate the target valve opening P*hi of the steam turbine valve according to the relationship between the evaluation value F and each preset evaluation value:

[0128] Under the first evaluation and value comparison result, the third preset valve opening compensation coefficient y3 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y3;

[0129] Under the second evaluation and value comparison result, the second preset valve opening compensation coefficient y2 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y2;

[0130] Based on the third evaluation and value comparison result, the first preset valve opening compensation coefficient y1 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y1;

[0131] Among them, the first evaluation and value comparison result is F<W1, the second evaluation and value comparison result is W1≤F<W2, and the third evaluation and value comparison result is W2≤F.

[0132] In this embodiment, the first preset evaluation sum value W1 is 4, and the second preset evaluation sum value W2 is 6.

[0133] In this embodiment, the first preset valve opening compensation coefficient is 0.95, the second preset valve opening compensation coefficient y2 is 1, and the third preset valve opening compensation coefficient is 1.15.

[0134] The beneficial effect of the above technical solution is: when the target valve opening of the turbine valve is set to P*hi, i=1, 2, 3, 4, 5, the target valve opening P*hi of the turbine valve is compensated according to the relationship between the evaluation sum value F and each preset evaluation sum value. By compensating the target valve opening P*hi of the turbine valve, dynamic adjustment of the valve opening can be achieved, intelligent control can be achieved, and the situation that the turbine may have unstable operation when it is opened or closed can be effectively dealt with.

[0135] In some embodiments of the present application, it also includes:

[0136] The alarm module is used to monitor the abnormality of the steam turbine valve and issue an alarm in real time when the steam turbine valve is abnormal.

[0137] The beneficial effect of the above technical solution is that the present invention can give a real-time alarm for abnormal situations, thereby avoiding further damage to the turbine valve and avoiding affecting the normal operation of the turbine.

[0138] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0139] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0140] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control system for a steam turbine valve, characterized in that: include: A first calculation module is used to obtain a real-time steam flow rate and a required steam flow rate of a steam turbine valve, and determine whether to adjust the valve opening of the steam turbine valve according to the real-time steam flow rate and the required steam flow rate, and if so, determine an initial valve opening of the steam turbine valve according to the real-time steam flow rate and the required steam flow rate; A second calculation module is used to collect characteristic parameters of the steam turbine within a preset time period, and determine whether the steam turbine has an operation abnormality based on the characteristic parameters. If so, a speed set and a load set are constructed based on the characteristic parameters, and an abnormal fluctuation index of the steam turbine is calculated according to the speed set and the load set, wherein the characteristic parameters include the speed of the steam turbine and the load of the steam turbine; A valve correction module, used for correcting the initial valve opening of the steam turbine valve according to the abnormal fluctuation index to obtain a target valve opening of the steam turbine valve; A valve control module, used for controlling the steam turbine valve according to the target valve opening; The first calculation module is used to calculate the steam flow ratio of the real-time steam flow and the required steam flow; The first calculation module is used for determining not to adjust the valve opening of the steam turbine valve when the steam flow ratio is greater than or equal to 1; The first calculation module is used for determining whether to adjust the valve opening of the steam turbine valve when the steam flow ratio is less than 1, and calculating the steam flow difference between the real-time steam flow and the required steam flow; The first calculation module is used to calculate the valve opening adjustment factor of the steam turbine valve according to the steam flow difference, and adjust the valve opening of the steam turbine valve based on the valve opening adjustment factor to obtain the initial valve opening, wherein the product value of the valve opening and the valve opening adjustment factor is used as the initial valve opening; The first calculation module calculates the valve opening adjustment factor of the steam turbine valve according to the following formula: Among them, q is the valve opening adjustment factor of the turbine valve, and a is the steam flow difference; The second calculation module is used to construct a speed set according to all speeds, and to construct a load set according to all loads; The second calculation module is used to obtain a preset standard speed and standard load; The second calculation module is used to determine whether there is a speed less than the standard speed in the speed set, and if so, generate a first abnormal signal, and determine whether there is a load less than the standard load in the load set, and if so, generate a second abnormal signal; The second calculation module is used for determining that the steam turbine has an operating abnormality when the first abnormal signal and the second abnormal signal are identified; The second calculation module is used to generate a non-abnormal speed set according to all speeds in the speed set that are greater than or equal to the standard speed, and to generate an abnormal speed set according to the remaining speeds; The second calculation module is used to generate a non-abnormal load set according to all loads in the load set that are greater than or equal to the standard load, and to generate an abnormal load set according to the remaining loads; The second calculation module is used to calculate the average speed of the non-abnormal speed set and the average load of the non-abnormal load set respectively; The second calculation module is used to calculate the abnormal fluctuation index of the steam turbine according to the abnormal speed set, the abnormal load set, the speed average value and the load average value; The second calculation module calculates the abnormal fluctuation index of the steam turbine according to the following formula: Wherein, E is the abnormal fluctuation index of the steam turbine, n1 is the number of speeds in the abnormal speed set, bi 1 is the i 1th speed in the abnormal speed set, b is the average speed, n2 is the number of loads in the abnormal load set, ci2 is the i 2th load in the abnormal load set, c is the average load, bmax is the maximum speed in the abnormal speed set, cmax is the maximum load in the abnormal load set, u1 is the weight corresponding to the speed, u2 is the weight corresponding to the load, and u1+u2=1; The valve correction module is used to obtain the initial valve opening P of the steam turbine valve; The valve correction module is used to preset a first preset abnormal fluctuation index G1 and a second preset abnormal fluctuation index G2, and G1<G2; The valve correction module is used to preset a first preset valve opening correction coefficient h1, a second preset valve opening correction coefficient h2, and a third preset valve opening correction coefficient h3, and 0.8<h1<h2<h3<1.2; The valve correction module is used to correct the initial valve opening P of the steam turbine valve according to the relationship between the abnormal fluctuation index E of the steam turbine and each preset abnormal fluctuation index, so as to obtain the target valve opening of the steam turbine valve; Based on the comparison result of the first abnormal fluctuation index, the first preset valve opening correction coefficient h1 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h1 of the steam turbine valve; Based on the comparison result of the second abnormal fluctuation index, the second preset valve opening correction coefficient h2 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h2 of the steam turbine valve; Based on the comparison result of the third abnormal fluctuation index, the third preset valve opening correction coefficient h3 is selected to correct the initial valve opening P of the steam turbine valve to obtain the target valve opening P*h3 of the steam turbine valve; Among them, the comparison result of the first abnormal fluctuation index is E<G1, the comparison result of the second abnormal fluctuation index is G1≤E<G2, and the comparison result of the third abnormal fluctuation index is G2≤E.

2. The control system for a steam turbine valve according to claim 1, characterized in that: The valve control module comprises: A first acquisition module, used to acquire the steam temperature and steam pressure of the steam turbine valve; A second acquisition module is used to acquire a preset steam temperature range and a steam pressure range; A judgment module, used for judging whether the steam temperature and the steam pressure are both within the steam temperature range and the steam pressure range; A control module, configured to control the steam turbine valve according to the target valve opening when the steam temperature and the steam pressure are both within the steam temperature range and the steam pressure range; A compensation module is used to compensate the target valve opening of the steam turbine valve according to the steam temperature and the steam pressure when one or both of the steam temperature and the steam pressure are not within the steam temperature range and the steam pressure range, and control the steam turbine valve according to the compensated target valve opening.

3. The control system for a steam turbine valve according to claim 2, characterized in that: The compensation module is used to evaluate the steam temperature based on a pre-trained steam temperature evaluation model to obtain a first evaluation value F1; The compensation module is used to evaluate the steam pressure based on a pre-trained steam pressure evaluation model to obtain a second evaluation value F2; The compensation module is used to calculate an evaluation sum value F of the first evaluation value F1 and the second evaluation value F2, and compensate the target valve opening of the steam turbine valve according to the evaluation sum value F.

4. The control system for a steam turbine valve according to claim 3, characterized in that: The compensation module is used to preset a first preset evaluation and value W1 and a second preset evaluation and value W2, and W1<W2; The compensation module is used to preset a first preset valve opening compensation coefficient y1, a second preset valve opening compensation coefficient y2, and a third preset valve opening compensation coefficient y3, and 0.8<y1<y2<y3<1.2; When the target valve opening of the steam turbine valve is set to P*hi, i=1, 2, 3, the compensation module is used to compensate the target valve opening P*hi of the steam turbine valve according to the relationship between the evaluation value F and each preset evaluation value: Under the first evaluation and value comparison result, the third preset valve opening compensation coefficient y3 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y3; Under the second evaluation and value comparison result, the second preset valve opening compensation coefficient y2 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y2; Based on the third evaluation and value comparison result, the first preset valve opening compensation coefficient y1 is selected to compensate the target valve opening P*hi of the steam turbine valve to obtain the compensated target valve opening P*hi*y1; Among them, the first evaluation and value comparison result is F<W1, the second evaluation and value comparison result is W1≤F<W2, and the third evaluation and value comparison result is W2≤F.

5. The control system for a steam turbine valve according to claim 1, characterized in that: Also includes: The alarm module is used to monitor the abnormality of the steam turbine valve and issue an alarm in real time when the steam turbine valve is abnormal.

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