Calculation method and device for valve flow characteristic test

Abstract

The invention relates to the technical field of automatic control, and discloses a calculation method and device for a valve flow characteristic test. According to the invention, the initial equivalent actual flow of each group of collected data, the target equivalent actual flow of each group of collected data and the deviation absolute value between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module are further calculated; and whether each unit parameter and each module parameter in the valve flow characteristic function logic structure need to be modified is judged through the deviation absolute value, so that the load control effect of the unit can be ensured, the automatic power generation control performance of the unit can be improved, the valve flow test verification of the unit can be carried out in time, and the valve flow can be modified. Therefore, the unit is always in the working condition of excellent AGC control and primary frequency modulation, and the economic index of the unit is improved.

Description

Technical Field

[0001] The invention relates to the field of automatic control technology, and in particular to a calculation method and device for a valve flow characteristic test. Background Art

[0002] The purpose of the turbine valve flow characteristic test is to check the consistency between the turbine equivalent flow curve and the ideal flow curve, and to obtain the linear relationship between the DEH flow command of the digital electric hydraulic control system (DHE) and the equivalent actual flow through the test data. If necessary, flow linearity correction is performed to fit a reasonable valve flow curve.

[0003] The valve flow characteristic test is very important for power generation companies, but there are two problems. The first problem is that the valve flow characteristic curve of the unit is given by the main engine factory when the unit leaves the factory. During the actual operation of the unit, the wear and tear of the valve inside and the daily maintenance make the flow performance of the valve change. If the previous valve flow characteristic function is continued, the equivalent actual flow of the unit will deviate from the ideal curve, and the linearity of the unit steam flow and the opening of the throttle will deteriorate. When the matching degree of the steam turbine valve flow characteristic and the function is poor, the load control effect of the unit cannot be guaranteed, which in turn affects the control performance of the automatic generation control (AGC) of the unit and the quality of primary frequency regulation. Therefore, after the unit has been running for a period of time or the valve has been overhauled, the valve flow characteristic of the unit must be tested and verified. The second problem is that the valve flow characteristic test generally needs to be completed by professional test personnel, and most tests require separate contracts. The entire test process and report issuance time are relatively long. Therefore, when the equivalent actual flow of the unit deviates significantly from the ideal curve, the power generation company is unable to conduct valve flow test verification and modify the valve flow of the unit in a timely manner, causing the unit to be in a poor AGC control and primary frequency regulation condition, affecting the economic indicators of the unit. Summary of the invention

[0004] In view of this, the present invention provides a calculation method and device for a valve flow characteristic test to solve the problem that when the steam turbine valve flow characteristic and the function match poorly, the load control effect of the unit cannot be guaranteed, thereby affecting the automatic power generation control performance and primary frequency regulation quality of the unit and affecting the economic indicators of the unit.

[0005] According to the first aspect, the embodiment of the present disclosure provides a calculation method for a valve flow characteristic test, which is applied to a DEH valve flow function logic structure, wherein the DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module, and the valve flow characteristic function logic module includes: a total valve position instruction module, a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment gate instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment gate instruction unit is connected to the multiplier corresponding to the fifth coefficient unit, and the method includes:

[0006] Acquire multiple groups of collected data, each group of collected data includes: rated main steam pressure of the unit, rated regulating pressure of the unit, current main steam pressure of the unit, and current regulating pressure of the unit;

[0007] Based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, the initial equivalent actual flow rate of each set of collected data is calculated;

[0008] Based on the initial equivalent actual flow of each set of collected data, the target equivalent actual flow of each set of collected data is denoted;

[0009] Calculate the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module;

[0010] Determine whether the absolute value of the deviation is greater than a preset value;

[0011] If the absolute value of the deviation is greater than a preset value, each unit parameter and each module parameter in the logic structure of the valve flow characteristic function corresponding to the group of collected data are modified in a positive direction in sequence;

[0012] In response to the positive modification of each unit parameter in the valve flow characteristic function logic structure, each unit parameter and each module parameter in the valve flow characteristic function logic structure corresponding to the group of collected data are reversely modified in turn.

[0013] By executing the above-mentioned implementation mode, the present invention can not only ensure the load control effect of the unit and improve the automatic power generation control performance of the unit, but also can timely perform the valve flow test verification of the unit and modify the valve flow, thereby ensuring that the unit is always in an excellent working condition of AGC control and primary frequency regulation, thereby improving the economic indicators of the unit.

[0014] In some optional implementations, the calculation method of the valve flow characteristic test in the embodiment of the present disclosure further includes:

[0015] If the absolute value of the deviation is less than or equal to the preset value, it is determined that each unit parameter and each module parameter in the logic structure of the valve flow characteristic function are in a normal state.

[0016] By executing the above implementation, by determining that the absolute value of the deviation is less than or equal to the preset value, when each unit parameter and each module parameter in the valve flow characteristic function logic structure are in a normal state, frequent modification of the parameters in the valve flow characteristic function logic structure is avoided.

[0017] In some optional implementations, based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, the initial equivalent actual flow of each set of collected data is calculated, which is performed by the following formula:

[0018]

[0019] Among them, P1 is the initial equivalent actual flow of each set of collected data, PT e is the rated main steam pressure of the unit, PM e is the rated regulating pressure of the unit, PM1 is the current regulating pressure of the unit, and PT1 is the current main steam pressure of the unit.

[0020] In some optional implementations, based on the initial equivalent actual flow of each set of collected data, the target equivalent actual flow of each set of collected data is calculated by the following formula:

[0021] Q1=100×P1 / P Max

[0022] Among them, Q1 is the target equivalent actual flow rate of each set of collected data, P1 is the initial equivalent actual flow rate of each set of collected data, and P Max The maximum equivalent flow rate for each group of collected data.

[0023] In some optional implementations, the absolute value of the deviation between the target equivalent actual flow of each set of collected data and the total valve position instruction parameter output by the total valve position instruction module is calculated by the following formula:

[0024] Δ=|Q1-Z1|

[0025] Among them, Δ is the absolute value of the deviation, Q1 is the target equivalent actual flow of each set of collected data, and Z1 is the total valve position instruction parameter output by the total valve position instruction module.

[0026] By executing the above implementation method, the initial equivalent actual flow of each group of collected data, the target equivalent actual flow of each group of collected data, and the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module are further calculated, ultimately to determine whether it is necessary to modify the unit parameters and module parameters in the logical structure of the valve flow characteristic function.

[0027] According to the second aspect, an embodiment of the present disclosure provides a computing system for a valve flow characteristic test, including: a DEH valve flow function logic structure, a data acquisition module, a data processing module, a data storage module and a data output module.

[0028] The DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module, and the valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment gate instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment gate instruction unit is connected to the multiplier corresponding to the fifth coefficient unit;

[0029] The data acquisition module is used to collect the parameters of each unit and each module in the logic structure of the valve flow characteristic function manually input by the user, as well as the rated main steam pressure of the unit and the rated regulating pressure of the unit; and is used to automatically collect the total valve position instruction, the current main steam pressure of the unit, the current regulating pressure of the unit, multiple high-pressure valve instructions, the current load of the unit, the furnace negative pressure, the main steam temperature, the feed water flow, the drum water level, and the steam turbine vibration according to the sampling time;

[0030] A data storage module is used to store various data collected manually and automatically by the data collection module;

[0031] A data processing module, used to execute the calculation method of the valve flow characteristic test in the first aspect or any embodiment of the first aspect;

[0032] The data output module is used to output the modification result obtained by executing the calculation method of the valve flow characteristic test in the first aspect or any embodiment of the first aspect.

[0033] In a third aspect, the present invention provides a calculation device for a valve flow characteristic test, which is applied to a DEH valve flow function logic structure. The DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module. The valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment gate instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment gate instruction unit is connected to the multiplier corresponding to the fifth coefficient unit. The device includes:

[0034] A data acquisition unit, used to acquire multiple sets of collected data, each set of collected data includes: rated main steam pressure of the unit, rated regulating pressure of the unit, current main steam pressure of the unit, and current regulating pressure of the unit;

[0035] The first calculation unit is used to calculate the initial equivalent actual flow rate of each group of collected data based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit;

[0036] Data per unit unit, used to per unit target equivalent actual flow rate of each group of collected data based on the initial equivalent actual flow rate of each group of collected data;

[0037] The second calculation unit is used to calculate the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module;

[0038] A data judgment unit, used to judge whether the absolute value of the deviation is greater than a preset value;

[0039] A positive modification unit, used for positively modifying the parameters of each unit and each module in the logic structure of the valve flow characteristic function corresponding to the group of collected data in sequence if the absolute value of the deviation is greater than a preset value;

[0040] The reverse modification unit is used to modify the unit parameters and module parameters in the valve flow characteristic function logic structure corresponding to the group of collected data in reverse order in response to the forward modification of the unit parameters in the valve flow characteristic function logic structure.

[0041] In a fourth aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the calculation method for the valve flow characteristic test of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0042] In a fifth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the calculation method for the valve flow characteristic test of the first aspect or any corresponding embodiment thereof.

[0043] In a sixth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the calculation method for a valve flow characteristic test of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 is a logical structure diagram of a DEH valve flow function according to an embodiment of the present invention;

[0046] Figure 2 is a flow chart of a calculation method for a valve flow characteristic test according to an embodiment of the present invention;

[0047] Figure 3 is a judgment schematic diagram of a calculation method for a valve flow characteristic test according to an embodiment of the present invention;

[0048] Figure 4 It is a schematic diagram of positively modifying each unit parameter and each module parameter in the logic structure of the valve flow characteristic function corresponding to the group of collected data according to an embodiment of the present invention;

[0049] Figure 5 It is a schematic diagram of reversely modifying each unit parameter and each module parameter in the logic structure of the valve flow characteristic function corresponding to the group of collected data according to an embodiment of the present invention;

[0050] Figure 6 is a schematic diagram of the structure of a calculation system for a valve flow characteristic test according to an embodiment of the present invention;

[0051] Figure 7is a schematic diagram of a specific process of data collection according to an embodiment of the present invention;

[0052] Figure 8 is a structural block diagram of a calculation device for a valve flow characteristic test according to an embodiment of the present invention;

[0053] Fig. 9 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0055] According to an embodiment of the present invention, a calculation method embodiment of a valve flow characteristic test is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0056] The calculation method of the valve flow characteristic test in the embodiment of the present invention is applied to the DEH valve flow function logic structure diagram, the DEH valve flow function logic structure diagram includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module, the valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment gate instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment gate instruction unit is connected to the multiplier corresponding to the fifth coefficient unit.

[0057] For example, Figure 1As shown, the DEH valve flow function logic structure diagram includes: six groups of valve flow characteristic function logic modules MF, and a total valve position instruction module Z. The first group of valve flow characteristic function logic modules MF includes: a first coefficient unit M11, a second coefficient unit M12, a third coefficient unit M13, a fourth coefficient unit M14, a fifth coefficient unit M15, a first flow characteristic function unit F11(x), a second flow characteristic function unit F12(x), a third flow characteristic function unit F13(x), a fourth flow characteristic function unit F14(x), a fifth flow characteristic function unit F15(x) and a high-pressure valve instruction unit GV1.

[0058] Similarly, the second group of valve flow characteristic function logic modules includes: a first coefficient unit M21, a second coefficient unit M22, a third coefficient unit M23, a fourth coefficient unit M24, a fifth coefficient unit M25, a first flow characteristic function unit F21(x), a second flow characteristic function unit F22(x), a third flow characteristic function unit F23(x), a fourth flow characteristic function unit F24(x), a fifth flow characteristic function unit F25(x) and a high-pressure valve instruction unit GV2.

[0059] Similarly, the third group of valve flow characteristic function logic modules includes: a first coefficient unit M31, a second coefficient unit M32, a third coefficient unit M33, a fourth coefficient unit M34, a fifth coefficient unit M35, a first flow characteristic function unit F31(x), a second flow characteristic function unit F32(x), a third flow characteristic function unit F33(x), a fourth flow characteristic function unit F34(x), a fifth flow characteristic function unit F35(x) and a high-pressure valve command unit GV3.

[0060] Similarly, the fourth group of valve flow characteristic function logic modules includes: a first coefficient unit M41, a second coefficient unit M42, a third coefficient unit M43, a fourth coefficient unit M44, a fifth coefficient unit M45, a first flow characteristic function unit F41(x), a second flow characteristic function unit F42(x), a third flow characteristic function unit F43(x), a fourth flow characteristic function unit F44(x), a fifth flow characteristic function unit F45(x) and a high-pressure valve command unit GV4.

[0061] Similarly, the fifth group of valve flow characteristic function logic modules includes: a first coefficient unit M51, a second coefficient unit M52, a third coefficient unit M53, a fourth coefficient unit M54, a fifth coefficient unit M55, a first flow characteristic function unit F51(x), a second flow characteristic function unit F52(x), a third flow characteristic function unit F53(x), a fourth flow characteristic function unit F54(x), a fifth flow characteristic function unit F55(x) and a high-pressure valve command unit GV5.

[0062] Similarly, the sixth group of valve flow characteristic function logic modules includes: a first coefficient unit M61, a second coefficient unit M62, a third coefficient unit M63, a fourth coefficient unit M64, a fifth coefficient unit M65, a first flow characteristic function unit F61(x), a second flow characteristic function unit F62(x), a third flow characteristic function unit F63(x), a fourth flow characteristic function unit F64(x), a fifth flow characteristic function unit F65(x) and a high-pressure valve command unit GV6.

[0063] In this embodiment, a calculation method for a valve flow characteristic test is provided, which can be used in mobile terminals, such as mobile phones, tablet computers, etc. Figure 2 is a flow chart of a calculation method for a valve flow characteristic test according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0064] Step S201, obtaining multiple groups of collected data, each group of collected data includes: the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit.

[0065] Specifically, taking the example of collecting 2000 groups of collected data, taking the first group of data as an example, the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit corresponding to the first group of collected data are obtained.

[0066] Step S202, based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, calculate the initial equivalent actual flow of each group of collected data.

[0067] In a specific example, based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, the initial equivalent actual flow of each set of collected data is calculated, which is performed by the following formula:

[0068]

[0069] Among them, P1 is the initial equivalent actual flow of each set of collected data, PT e is the rated main steam pressure of the unit, PM e is the rated regulating pressure of the unit, PM1 is the current regulating pressure of the unit, and PT1 is the current main steam pressure of the unit.

[0070] Specifically, for the 2000 sets of data in the above example, the initial equivalent actual flow of each set of collected data is calculated using the above formula.

[0071] Step S203: based on the initial equivalent actual flow of each group of collected data, calibrate the target equivalent actual flow of each group of collected data.

[0072] In a specific example, based on the initial equivalent actual flow of each set of collected data, the target equivalent actual flow of each set of collected data is calibrated by the following formula:

[0073] Q1=100×P1 / P Max

[0074] Among them, Q1 is the target equivalent actual flow rate of each set of collected data, P1 is the initial equivalent actual flow rate of each set of collected data, and P Max The maximum equivalent flow rate for each group of collected data.

[0075] Specifically, for the 2000 sets of data in the above example, the target equivalent actual flow of each set of collected data is normalized by the above formula. Max The ratio between P1 of the first group of data of the 2000 groups of data and P1 of the 2000th group of data of the 2000 groups of data may be selected.

[0076] Step S204, calculating the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module.

[0077] In a specific example, the absolute value of the deviation between the target equivalent actual flow of each set of collected data and the total valve position instruction parameter output by the total valve position instruction module is calculated by the following formula:

[0078] Δ=|Q1-Z1|

[0079] Among them, Δ is the absolute value of the deviation, Q1 is the target equivalent actual flow of each set of collected data, and Z1 is the total valve position instruction parameter output by the total valve position instruction module.

[0080] Step S205, determining whether the absolute value of the deviation is greater than a preset value.

[0081] Specifically, the preset value here can be 2, and can also be set according to actual scenarios. Figure 3 shown.

[0082] Step S206: if the absolute value of the deviation is greater than a preset value, each unit parameter and each module parameter in the logic structure of the valve flow characteristic function corresponding to the group of collected data is modified in a positive direction in sequence.

[0083] Specifically, for example, it is determined whether the unit parameters and module parameters in the valve flow characteristic function logic structure need to be modified according to the absolute value of the deviation Δ. If the absolute value of the deviation Δ of 2000 sets of data is greater than 2, it is necessary to modify the unit parameters and module parameters in the valve flow characteristic function logic structure. Figure 4 shown.

[0084] Step S207, in response to the positive modification of each unit parameter in the valve flow characteristic function logic structure, the unit parameters and module parameters in the valve flow characteristic function logic structure corresponding to the group of collected data are reversely modified in sequence.

[0085] Specific as Figure 5 As shown, for example, the data of the equivalent actual flow Q1 after standardization is calculated by each step of coefficients M11, F11(x), coefficients M12, F12(x), coefficients M13, F13(x), coefficients M14, F14(x), and coefficients M15 are sent to the data output module. Take the first set of data as an example, where the F11(x) function is shown in Table 1.

[0086] Table 1F11(x) function values

[0087] X Y 1 0 0 2 72.03 60.917 3 81 68.99 4 86 74.79 5 91 81.934 6 100 100

[0088] The equivalent actual flow Q1 after standardization passes through the coefficient M11, and we get a11=Q1*M11. a11 enters the F11(x) function, and the result is as follows:

[0089] b11,b11=TREND(OFFSET(Y,MATCH(a11,X1:X7,1),,2,1),OFFSET(X,MATCH(a11,X1:$X7,1),,2,1),a11), TREND function: constructs a linear regression line equation based on the known values ​​of the x sequence and the y sequence, and then calculates the y value sequence corresponding to the x value sequence based on the constructed linear equation. For example, when r11=98.76, the calculation method of the TREND function is equivalent to the following formula:

[0090]

[0091] The calculation result of the above formula is b11 = 97.52. Figure 4 As shown, according to the same calculation method, the values ​​of c11, d11, e11, f11, g11, h11, and i11 are obtained respectively. The calculation methods of various parameters in GV2 to GV6 are the same as above.

[0092] In the above reverse modification process, the data of each step of the inverse calculation of the GV1 instruction through the coefficients M15, F14(x), M14, F13(x), M13, F12(x), M12, F11(x), and M11 can be sent to the result output module (3). Still taking the first set of data as an example, the F11(x) function is shown in Table 1 as an example.

[0093] exist Figure 5 In the equation, o11 passes through the coefficient M12 to get p11 = O11 / M12. p11 enters the F11(x) function for reverse calculation, and the result is r11, b11 = TREND(OFFSET(X, MATCH(r11, Y1: Y7, 1),, 2, 1), OF FSET(Y, MATCH(r11, Y1: $Y7, 1),, 2, 1), r11). TREND function: Based on the known values ​​of the x sequence and the y sequence, a linear regression line equation is constructed, and then the y value sequence corresponding to the x value sequence is calculated based on the constructed line equation. For example, when p11 = 97.52, the calculation method of the TREND function is equivalent to the following formula:

[0094]

[0095] The calculation result of the above formula is q11 = 98.76. Figure 5 As shown, according to the same calculation method, the values ​​of j11, k11, L11, m11, n11, O11, p11, q11, and r11 are obtained through GV1-1. The calculation methods of various parameters in GV2 to GV6 are the same as above.

[0096] In some optional embodiments, the calculation method of the valve flow characteristic test in the embodiment of the present disclosure also includes: step S208, if the absolute value of the deviation is less than or equal to a preset value, determining that each unit parameter and each module parameter in the valve flow characteristic function logic structure are in a normal state.

[0097] In summary, the calculation method of the valve flow characteristic test in the embodiment of the present invention calculates the initial equivalent actual flow of each group of collected data based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit; based on the initial equivalent actual flow of each group of collected data, the target equivalent actual flow of each group of collected data is calibrated; the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module is calculated; it is determined whether the absolute value of the deviation is greater than a preset value; if the absolute value of the deviation is greater than the preset value, each unit parameter and each module parameter in the valve flow characteristic function logic structure corresponding to the group of collected data are modified in a positive manner in sequence; in response to the positive modification of each unit parameter in the valve flow characteristic function logic structure, each unit parameter and each module parameter in the valve flow characteristic function logic structure corresponding to the group of collected data are modified in a negative manner in sequence. Ultimately, the present invention can not only ensure the load control effect of the unit and improve the automatic power generation control performance of the unit, but also can timely conduct valve flow test verification and modify the valve flow of the unit, thereby ensuring that the unit is always in an excellent working condition of AGC control and primary frequency regulation, thereby improving the economic indicators of the unit.

[0098] Based on the same concept, this embodiment provides a calculation system for valve flow characteristic test. Figure 6 It is a computing system for valve flow characteristic test according to an embodiment of the present invention, and the system comprises: DEH valve flow function logic structure 601, data acquisition module 602, data processing module 603, data storage module 604 and data output module 605.

[0099] exist Figure 1 In the DEH valve flow function logic structure, the valve flow characteristic function logic module includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module. The valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment gate instruction unit. Two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment gate instruction unit is connected to the multiplier corresponding to the fifth coefficient unit.

[0100] Specifically, for the specific schematic diagram of the logical structure of the DEH valve flow function, please refer to the above content, which will not be repeated here in detail.

[0101] The data acquisition module 602 is used to collect the parameters of each unit and each module in the logic structure of the valve flow characteristic function manually input by the user, as well as the rated main steam pressure of the unit and the rated regulating pressure of the unit; and is used to automatically collect the total valve position instruction, the current main steam pressure of the unit, the current regulating pressure of the unit, multiple high-pressure valve instructions, the current load of the unit, the furnace negative pressure, the main steam temperature, the feed water flow, the steam drum water level, and the steam turbine vibration according to the sampling time.

[0102] Specifically, Figure 7 As shown, the data acquisition module 602 includes a manual input function and an automatic acquisition function. The manual input parameters include Figure 1 The F11(x), F12(x), F13(x), F14(x) functions and the coefficients before and after the functions M11, M12, M13, M14, M15, and the rated main steam pressure PT of the unit e , rated regulating pressure PM of the unit e , if the valve flow characteristic function logic structure contains only 3 F(x) functions, then only F11(x), F12(x), and F13(x) need to be input. The default value of each function is (-200, -200; 200, 200). If there are coefficients before and after the function, input them. If not, do not input them. The default values ​​of M11, M12, M13, M14, and M15 are 1. The automatically collected data include: sampling time Time, total valve position command Z, current main steam pressure PT1 of the unit, current regulating pressure PM1 of the unit, all high-pressure valve commands GV1~GV6, unit load MW, furnace negative pressure FP, main steam temperature MST, feed water flow FW, drum water level BL (if any), and turbine vibration STV. Among them, if the unit has only 4 high-pressure valves, collect GV1~GV4 commands. Unit load, furnace negative pressure, main steam problem, feed water flow, drum water level (if any), and turbine vibration are only used as reference values. The sampling period of automatic collection is 1 second, and each set of data is sorted and numbered automatically according to the event sequence. The data in manual input and automatic collection are sent to the data storage module 604 for processing by the data processing module 603.

[0103] The data processing module 603 is used to execute the calculation method of the valve flow characteristic test in the above embodiment, that is, the data processing module 603 obtains multiple groups of collected data, each group of collected data includes: the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit; based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, calculate the initial equivalent actual flow of each group of collected data; based on the initial equivalent actual flow of each group of collected data, standardize the target equivalent actual flow of each group of collected data; calculate the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module; determine whether the absolute value of the deviation is greater than a preset value; if the absolute value of the deviation is greater than the preset value, correspondingly modify the unit parameters and the module parameters in the valve flow characteristic function logic structure corresponding to the group of collected data in a positive direction in sequence; in response to the positive modification of the unit parameters in the valve flow characteristic function logic structure, reversely modify the unit parameters and the module parameters in the valve flow characteristic function logic structure corresponding to the group of collected data in sequence. If the absolute value of the deviation is less than or equal to the preset value, it is determined that each unit parameter and each module parameter in the logic structure of the valve flow characteristic function are in a normal state.

[0104] Specifically, the process of the data processing module 603 executing the above actions refers to the above embodiment.

[0105] The data storage module 604 is used to store various data manually collected by the user and automatically collected by the data collection module.

[0106] Specifically, the data storage module 604 is used to store various data manually input by the user and automatically collected, and to number the automatically collected data in chronological order.

[0107] The data output module 605 outputs the modification result obtained by executing the calculation method of the valve flow characteristic test in the above embodiment.

[0108] Specifically, the data output module can be manually selected by the test personnel to modify the function, and according to the calculation of the initial equivalent actual flow and the target equivalent actual flow, the unit parameters and module parameters in the logic structure of the valve flow characteristic function corresponding to the collected data are modified positively and negatively to give a new fitting function F(x). For example, if the F11(x) function is modified, the 2000 groups of a11~a12000 are used as X items, and p11~p12000 are used as Y items to fit a new equation. If the F12(x) function is modified, the 2000 groups of c11~c12000 are used as X items, and n11~n12000 are used as Y items to fit a new equation. If the F13(x) function is modified, the 2000 groups of e11~e12000 are used as X items, and L11~L12000 are used as Y items to fit a new equation. If you choose to modify the F14(x) function, then use 2000 groups of g11~g12000 as X items and j11~j12000 as Y items to fit a new equation. For the fitting function, recommended values ​​will be given. Taking the function in Table 1 as an example, if you need to modify the F11(x) function, the recommended values ​​are shown in Table 2.

[0109] Table 2F11(x) new function values

[0110] a11~a12000 p11~p12000 1 0 p11 2 72.03 p1800 3 81 p11200 4 86 p11600 5 91 p11800 6 100 p12000

[0111] In all 2000 groups of numbers from a11 to a12000, the positions where the X item selection results are (0, 72.03, 81, 86, 91, 100) are respectively a11 = 0, a1800 = 72.03, a11200 = 81, a11600 = 86, a11800 = 91, a12000 = 100, then the values ​​selected by the Y item are the corresponding values ​​of p11, p1800, p11200, p11600, p11800, p12000. The modification method of F12(x), F13(x), and F14(x) functions is the same as F11(x).

[0112] In this embodiment, a calculation device for valve flow characteristic test is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated hereafter. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0113] This embodiment provides a calculation device for valve flow characteristic test, such as Figure 8 As shown, including:

[0114] According to an embodiment of the present disclosure, a calculation device for a valve flow characteristic test is provided, which is applied to a DEH valve flow function logic structure. The DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module. The valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment gate instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment gate instruction unit is connected to the multiplier corresponding to the fifth coefficient unit. The method includes:

[0115] The data acquisition unit 81 is used to acquire multiple sets of collected data, each set of collected data includes: the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit;

[0116] The first calculation unit 82 is used to calculate the initial equivalent actual flow rate of each set of collected data based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit;

[0117] A data per unit unit 83, used for per unitizing a target equivalent actual flow rate of each group of collected data based on an initial equivalent actual flow rate of each group of collected data;

[0118] The second calculation unit 84 is used to calculate the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module;

[0119] A data judging unit 85 is used to judge whether the absolute value of the deviation is greater than a preset value;

[0120] A positive modification unit 86 is used to positively modify each unit parameter and each module parameter in the valve flow characteristic function logic structure corresponding to the group of collected data in sequence if the absolute value of the deviation is greater than a preset value;

[0121] The reverse modification unit 87 is used to modify the unit parameters and module parameters in the valve flow characteristic function logic structure corresponding to the group of collected data in reverse order in response to the forward modification of the unit parameters in the valve flow characteristic function logic structure.

[0122] In some optional implementations, the calculation device for the valve flow characteristic test in the embodiment of the present disclosure further includes:

[0123] In some optional implementations, the calculation device for the valve flow characteristic test in the embodiment of the present disclosure further includes:

[0124] The normal determination module is used to determine that each unit parameter and each module parameter in the logic structure of the valve flow characteristic function are in a normal state if the absolute value of the deviation is less than or equal to a preset value.

[0125] In some optional implementations, the first calculation unit 82 calculates the initial equivalent actual flow of each set of collected data based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, and is executed by the following formula:

[0126]

[0127] Among them, P1 is the initial equivalent actual flow of each set of collected data, PT e is the rated main steam pressure of the unit, PM e is the rated regulating pressure of the unit, PM1 is the current regulating pressure of the unit, and PT1 is the current main steam pressure of the unit.

[0128] In some optional implementations, the data per unit unit 83 per unitizes the target equivalent actual flow of each group of collected data based on the initial equivalent actual flow of each group of collected data, and is performed by the following formula:

[0129] Q1=100×P1 / P Max

[0130] Among them, Q1 is the target equivalent actual flow rate of each set of collected data, P1 is the initial equivalent actual flow rate of each set of collected data, and P Max The maximum equivalent flow rate for each group of collected data.

[0131] In some optional implementations, the second calculation unit 84 calculates the absolute value of the deviation between the target equivalent actual flow of each set of collected data and the total valve position instruction parameter output by the total valve position instruction module, using the following formula:

[0132] Δ=|Q1-Z1|

[0133] Among them, Δ is the absolute value of the deviation, Q1 is the target equivalent actual flow of each set of collected data, and Z1 is the total valve position instruction parameter output by the total valve position instruction module.

[0134] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0135] The calculation device for the valve flow characteristic test in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0136] An embodiment of the present invention further provides a computer device having the above-mentioned computing device for the valve flow characteristic test.

[0137] See also Fig. 9 , Fig. 9 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Fig. 9 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig. 9 A processor 10 is taken as an example.

[0138] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0139] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0140] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0141] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0142] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0143] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0144] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0145] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A calculation method for valve flow characteristic test, characterized in that: Applied to the DEH valve flow function logic structure, the DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module, the valve flow characteristic function logic module includes: a total valve position instruction module, a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment valve instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment valve instruction unit is connected to the multiplier corresponding to the fifth coefficient unit, and the method includes: Acquire multiple groups of collected data, each group of collected data includes: rated main steam pressure of the unit, rated regulating pressure of the unit, current main steam pressure of the unit, and current regulating pressure of the unit; Calculate the initial equivalent actual flow rate of each set of collected data based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit; Based on the initial equivalent actual flow of each group of collected data, the target equivalent actual flow of each group of collected data is calibrated; Calculate the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module; Determine whether the absolute value of the deviation is greater than a preset value; If the absolute value of the deviation is greater than a preset value, each unit parameter and each module parameter in the logic structure of the valve flow characteristic function corresponding to the group of collected data are modified in a positive manner in sequence; In response to the positive modification of each unit parameter in the valve flow characteristic function logic structure, each unit parameter and each module parameter in the valve flow characteristic function logic structure corresponding to the group of collected data are reversely modified in turn.

2. The calculation method for valve flow characteristic test according to claim 1, characterized in that: Also includes: If the absolute value of the deviation is less than or equal to a preset value, it is determined that each unit parameter and each module parameter in the logic structure of the valve flow characteristic function is in a normal state.

3. The calculation method for valve flow characteristic test according to claim 1, characterized in that: Based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit, the initial equivalent actual flow of each set of collected data is calculated, which is performed by the following formula: Among them, P1 is the initial equivalent actual flow of each set of collected data, PT e is the rated main steam pressure of the unit, PM e is the rated regulating pressure of the unit, PM1 is the current regulating pressure of the unit, and PT1 is the current main steam pressure of the unit.

4. The calculation method for valve flow characteristic test according to claim 1, characterized in that: Based on the initial equivalent actual flow of each set of collected data, the target equivalent actual flow of each set of collected data is calibrated by the following formula: Q1=100×P1 / P Max Wherein, Q1 is the target equivalent actual flow rate of each set of collected data, P1 is the initial equivalent actual flow rate of each set of collected data, and P Max The maximum equivalent flow rate for each group of collected data.

5. The calculation method for valve flow characteristic test according to claim 1, characterized in that: The absolute value of the deviation between the target equivalent actual flow of each set of collected data and the total valve position instruction parameter output by the total valve position instruction module is calculated by the following formula: Δ=|Q1-Z1| Among them, Δ is the absolute value of the deviation, Q1 is the target equivalent actual flow of each group of collected data, and Z1 is the total valve position instruction parameter output by the total valve position instruction module.

6. A calculation system for valve flow characteristic test, characterized in that: include: DEH valve flow function logic structure, data acquisition module, data processing module, data storage module and data output module; The DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module, and the valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment valve instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment valve instruction unit is connected to the multiplier corresponding to the fifth coefficient unit; The data acquisition module is used to collect the parameters of each unit and each module in the logic structure of the valve flow characteristic function manually input by the user, as well as the rated main steam pressure of the unit and the rated regulating pressure of the unit; and is used to automatically collect the total valve position instruction, the current main steam pressure of the unit, the current regulating pressure of the unit, multiple high-pressure valve instructions, the current load of the unit, the furnace negative pressure, the main steam temperature, the feed water flow, the drum water level, and the steam turbine vibration according to the sampling time; A data storage module, used to store various data manually collected by the user and automatically collected by the data collection module; A data processing module, used to execute the calculation method of the valve flow characteristic test according to any one of claims 1 to 5; A data output module is used to output the modification result obtained by executing the calculation method of the valve flow characteristic test described in any one of claims 1 to 5.

7. A calculation device for valve flow characteristic test, characterized in that: Applied to the DEH valve flow function logic structure, the DEH valve flow function logic structure includes at least one group of valve flow characteristic function logic modules and a total valve position instruction module, the valve flow characteristic function logic module includes: a first coefficient unit, a second coefficient unit, a third coefficient unit, a fourth coefficient unit, a fifth coefficient unit, a first flow characteristic function unit, a second flow characteristic function unit, a third flow characteristic function unit, a fourth flow characteristic function unit, a fifth flow characteristic function unit, and a high-adjustment valve instruction unit, wherein two adjacent flow characteristic function units are connected through a multiplier, each coefficient unit is connected to its corresponding multiplier, the total valve position instruction module is connected to the multiplier corresponding to the first coefficient unit, and the high-adjustment valve instruction unit is connected to the multiplier corresponding to the fifth coefficient unit, and the device includes: A data acquisition unit, used to acquire multiple sets of collected data, each set of collected data includes: rated main steam pressure of the unit, rated regulating pressure of the unit, current main steam pressure of the unit, and current regulating pressure of the unit; A first calculation unit, configured to calculate an initial equivalent actual flow rate of each set of collected data based on the rated main steam pressure of the unit, the rated regulating pressure of the unit, the current main steam pressure of the unit, and the current regulating pressure of the unit; A data per unit unit, used for per unitizing a target equivalent actual flow rate of each group of collected data based on an initial equivalent actual flow rate of each group of collected data; A second calculation unit is used to calculate the absolute value of the deviation between the target equivalent actual flow of each group of collected data and the total valve position instruction parameter output by the total valve position instruction module; A data judgment unit, used to judge whether the absolute value of the deviation is greater than a preset value; A positive modification unit, used for, if the absolute value of the deviation is greater than a preset value, correspondingly and sequentially positively modifying each unit parameter and each module parameter in the valve flow characteristic function logic structure corresponding to the group of collected data; The reverse modification unit is used to modify the unit parameters and module parameters in the valve flow characteristic function logic structure corresponding to the group of collected data in reverse order in response to the forward modification of the unit parameters in the valve flow characteristic function logic structure.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the calculation method of the valve flow characteristic test according to any one of claims 1 to 5 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the calculation method for the valve flow characteristic test according to any one of claims 1 to 5.

10. A computer program product, characterized in that The invention comprises computer instructions for causing a computer to execute the calculation method for the valve flow characteristic test according to any one of claims 1 to 5.

Images