Anti-surge control method

Abstract

The invention provides an anti-surge control method. The anti-surge control method comprises the following steps: acquiring historical data of a surge point; inputting the historical data of the surge points into the to-be-trained model to obtain an anti-surge model; based on the anti-surge model, determining an anti-surge line of the fan; the anti-surge line is generated by translating the abscissa of the surge line of the fan in the anti-surge coordinate system rightwards by a first preset unit and translating the ordinate downwards by the first preset unit; the real-time fan inlet flow and the real-time fan total energy head of the fan are obtained, and the real-time working condition point of the fan is determined; whether the real-time working condition point is located below an anti-surge line or not is judged, and if not, the opening degree of an anti-surge valve is adjusted to 100%; if yes, the anti-surge opening degree and the anti-surge valve opening time are determined based on the real-time working condition point, the anti-surge valve is opened according to the anti-surge valve opening time, the anti-surge valve is controlled to operate at the anti-surge opening degree, and the problem that the position area where the working condition point of the draught fan is located cannot be accurately and automatically adjusted at present is solved.

Description

Technical Field

[0001] This application relates to the field of information automation technology, and in particular to an anti-surge control method. Background Technology

[0002] Blast furnace blowers are a crucial component of blast furnace ironmaking. They collect atmospheric air, pressurize it through a turbine compressor to create blast furnace cold air with a specific pressure and flow rate, and then deliver air to the furnace according to its conditions to ensure the oxygen required for blast furnace smelting and maintain a certain top pressure. Blast furnace blowers generally come in two types: axial flow blowers and centrifugal blowers. Regardless of the type used, the blower equipment must operate safely, stably, and economically.

[0003] Due to the continuous nature of blast furnace smelting and the frequent changes in furnace conditions caused by factors such as raw materials, fuel, and operations throughout the smelting process, operators need to adjust the equipment's adaptability range in real time according to the on-site operating conditions of the blower, ensuring it operates in a stable state under different air volumes and pressures—that is, the blower's operating point. During normal production, on-site operators often adjust the operating point to a suitable range based on experience. If the operating point is too far from the surge line, the blower's efficiency is low. While being too close to the surge line may temporarily improve blower efficiency, it hinders normal operation and easily leads to blower surge accidents. This causes strong reciprocating pulses in the airflow, repeatedly impacting the compressor rotor and other components, resulting in severe unit vibration and ultimately damaging the equipment.

[0004] Because it is impossible to accurately and automatically adjust the location of the operating point, a surge control method is needed that can both ensure the stable and economical operation of the wind turbine and achieve the purpose of surge prevention. Summary of the Invention

[0005] This application provides an anti-surge control method to solve the technical problem that it is currently impossible to accurately and automatically adjust the operating point of the fan.

[0006] This application provides a surge control method, including:

[0007] Acquire historical surge point data; the historical surge point data includes: the differential pressure at the fan throat, the exhaust pressure, and the inlet temperature corresponding to different stator blade openings of the fan;

[0008] The historical surge point data is input into the model to be trained to obtain the anti-surge model; the anti-surge model is configured with an anti-surge coordinate system; the surge line of the wind turbine is configured in the anti-surge coordinate system; the surge line represents the linear relationship between the inlet flow rate of the wind turbine and the total energy head of the wind turbine;

[0009] Based on the anti-surge model, the anti-surge line of the fan is determined; the anti-surge line is generated by shifting the horizontal coordinate of the surge line of the fan located in the anti-surge coordinate system to the right by a first preset unit and shifting the vertical coordinate downward by a first preset unit.

[0010] Obtain the real-time inlet flow rate and total energy head of the fan to determine the real-time operating point of the fan;

[0011] Determine whether the real-time operating point is below the anti-surge line. If not, adjust the opening of the anti-surge valve to 100%. If so, determine the anti-surge opening and the anti-surge valve opening time based on the real-time operating point, and open the anti-surge valve according to the anti-surge valve opening time and control the anti-surge valve to operate at the anti-surge opening.

[0012] In some embodiments, the step of inputting the surge point historical data into the model to be trained to obtain the anti-surge model includes:

[0013] The historical surge point data is input into the model to be trained to calculate the inlet flow rate of the wind turbine and the total energy head corresponding to the wind turbine at different surge points.

[0014] The inlet flow rate of the fan is:

[0015]

[0016] In the formula, PDI is the differential pressure at the fan throat; TIA is the fan inlet temperature; K1 is the inlet temperature compensation coefficient; and P0 is the local atmospheric pressure where the fan is located.

[0017] The total energy head of the wind turbine is:

[0018]

[0019] In the formula, PIA is the exhaust pressure of the fan, and K is the isentropic index of air;

[0020] Based on the inlet flow rate of the fan and the total energy head corresponding to the fan at different surge points, anti-surge performance curves are constructed to obtain an anti-surge model.

[0021] In some embodiments, the anti-surge coordinate system is further provided with an economic adjustment line; the economic adjustment line represents the linear relationship between the fan inlet flow rate and the total energy head of the fan when the fan is at its minimum power under different stator blade openings.

[0022] The method further includes:

[0023] Based on the anti-surge model, the opening of the fan's stator blades is adjusted so that the fan's real-time operating point is close to the economic adjustment line.

[0024] In some embodiments, the step of determining the anti-surge opening degree and the anti-surge valve opening time based on the real-time operating point includes:

[0025] Based on the real-time operating point, historical operating points are obtained; the real-time operating point and the historical operating point differ by a first preset time.

[0026] The historical operating points and real-time operating points are linearized to obtain linear historical operating points and linear real-time operating points.

[0027] Based on the linear historical operating points and the linear real-time operating points, the speed change at the real-time operating point is calculated; the speed change is:

[0028] VR6 = d(VR5 - VR4) ÷ dt;

[0029] In the formula, VR5 is the linear real-time operating point; VR4 is the linear historical operating point; t is the preset time;

[0030] Based on the speed change and the real-time operating point, the anti-surge opening degree and the anti-surge valve opening time are determined.

[0031] In some embodiments, the step of determining the anti-surge valve opening time based on the speed change and the real-time operating point includes:

[0032] Based on the anti-surge line, a comparison line is determined; the comparison line is generated by shifting the horizontal coordinate of the anti-surge line of the fan located in the anti-surge coordinate system to the left by a second preset unit and shifting the vertical coordinate upward by a second preset unit.

[0033] Determine whether the real-time operating point is located above the comparison line. If so, open the anti-surge valve according to the second preset time.

[0034] If not, then calculate the real-time operating point deviation; the real-time operating point deviation is:

[0035] VR8 = VR4 + 4 - VR5;

[0036] If the deviation of the real-time operating point is 0, the anti-surge valve will be opened according to the second preset time.

[0037] In some embodiments, the anti-surge valve includes: a main anti-surge valve and a secondary anti-surge valve;

[0038] After the step of opening the anti-surge valve according to the second preset time, the following steps are included:

[0039] After the anti-surge valve has been opened for a third preset time, if the real-time inlet flow of the fan decreases or the exhaust pressure of the fan increases, the opening degree of the main anti-surge valve shall be increased.

[0040] After the third preset time, if the real-time inlet flow of the fan decreases or the exhaust pressure of the fan increases, the secondary anti-surge valve will be opened until the real-time operating point is below the anti-surge line.

[0041] In some embodiments, after the step of calculating the real-time operating point deviation, the method includes:

[0042] If the real-time operating point deviation is greater than 0, determine whether the real-time operating point deviation is less than a first preset value;

[0043] If so, the anti-surge valve will be opened according to the fourth preset time; the fourth preset time is less than the second preset time.

[0044] If not, then determine whether the deviation of the real-time operating point is less than the second preset value; the second preset value is greater than the first preset value.

[0045] If so, the anti-surge valve will be opened according to the fifth preset time; the fifth preset time is greater than the second preset time.

[0046] If not, the anti-surge valve will not be opened.

[0047] In some embodiments, after the step of calculating the real-time operating point deviation, the method further includes:

[0048] Determine whether the speed change is greater than 0. If so, calculate the comprehensive value of the real-time operating point deviation.

[0049] When the speed change is greater than or equal to 0.01, the comprehensive value of the real-time operating point deviation is:

[0050] VR9 = VR8 ÷ VR6;

[0051] When the speed change is less than 0.01, the comprehensive value of the real-time operating point deviation is:

[0052] VR9 = VR8 ÷ 0.01;

[0053] If the comprehensive deviation value of the real-time operating point is less than the third preset value, the opening time of the anti-surge valve is reduced according to the fourth preset value.

[0054] In some embodiments, after the step of determining whether the change in velocity is greater than 0, the method includes:

[0055] If not, then calculate the comprehensive value of the real-time operating point deviation; the comprehensive value of the real-time operating point deviation is:

[0056] VR9 = VR8 ÷ 0.01;

[0057] If the comprehensive value of the real-time operating point deviation is less than the third preset value, the opening time of the anti-surge valve is increased according to the fourth preset value.

[0058] If the comprehensive deviation value of the real-time operating point is greater than the third preset value, then the anti-surge valve is closed.

[0059] In some embodiments, the step of determining the anti-surge opening based on the real-time operating point includes:

[0060] A linear operation is performed on the comprehensive deviation value of the real-time operating point to obtain the deviation linear value; the deviation linear value represents the opening speed of the anti-surge valve; the larger the deviation linear value, the slower the opening speed of the anti-surge valve; the smaller the deviation linear value, the faster the opening speed of the anti-surge valve.

[0061] Based on the linear historical operating points and the linear real-time operating points, the negative integral control value is calculated; the negative integral control value is:

[0062] VAR12 = (VR5 - VR4) ÷ VR4;

[0063] Based on the anti-surge model, the surge warning line of the wind turbine is determined; the surge warning line is generated by shifting the horizontal coordinate of the anti-surge line of the wind turbine in the anti-surge coordinate system to the right by a third preset unit and shifting the vertical coordinate downward by a third preset unit.

[0064] Based on the real-time operating point and the surge warning line, the valve opening value is determined according to the real-time anti-surge opening of the anti-surge valve; when the real-time operating point is located on the surge warning line, the valve opening value is greater than or equal to 0; when the real-time operating point is not located on the surge warning line, the valve opening value is less than or equal to 0.

[0065] Based on the aforementioned deviation linearity value, negative integral control value, and valve opening value, the anti-surge opening is determined;

[0066] VAR15=VAR14+(VAR11+VAR12+VAR13)×0.1;

[0067] In the formula, VAR11 is the deviation linearity value; VAR12 is the negative integral control value; VAR13 is the valve opening value; and VAR14 is the real-time anti-surge opening.

[0068] This application provides an anti-surge control method, comprising: acquiring historical surge point data; the historical surge point data including: differential pressure at the fan throat, exhaust pressure, and inlet temperature corresponding to different stator blade openings of the fan; inputting the historical surge point data into a training model to obtain an anti-surge model; the anti-surge model is configured with an anti-surge coordinate system; a surge line of the fan is configured within the anti-surge coordinate system; the surge line represents the linear relationship between the fan inlet flow rate and the total energy head of the fan; based on the anti-surge model, determining the anti-surge line of the fan; the anti-surge line is formed by the surge line of the fan located within the anti-surge coordinate system. The horizontal axis is shifted to the right by a first preset unit, and the vertical axis is shifted downward by a first preset unit to generate the value; the real-time inlet flow rate and total energy head of the fan are obtained to determine the real-time operating point of the fan; it is determined whether the real-time operating point is located below the anti-surge line. If not, the opening of the anti-surge valve is adjusted to 100%; if so, based on the real-time operating point, the anti-surge opening degree and the anti-surge valve opening time are determined, and the anti-surge valve is opened according to the anti-surge valve opening time and controlled to operate at the anti-surge opening degree, so as to solve the current problem that it is impossible to accurately and automatically adjust the location area of ​​the fan's operating point. Attached Figure Description

[0069] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] Figure 1 This is a flowchart of the anti-surge control method in this application;

[0071] Figure 2 This is a schematic diagram of the anti-surge coordinate system in this application. Detailed Implementation

[0072] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0073] Because some technologies cannot accurately and automatically adjust the operating point of the fan, this application provides an anti-surge control method to solve this problem. The anti-surge control method is described below:

[0074] like Figure 1The diagram shown is a flowchart of the anti-surge control method in this application.

[0075] This application provides a surge control method, including the following steps:

[0076] S100: Obtain historical surge point data; the historical surge point data includes: the differential pressure at the fan throat, the exhaust pressure, and the inlet temperature corresponding to different stator blade openings of the fan.

[0077] S200: Input the historical surge point data into the model to be trained to obtain the anti-surge model; the anti-surge model is configured with an anti-surge coordinate system, such as... Figure 2 As shown, the anti-surge coordinate system includes a surge line for the fan; the surge line represents the linear relationship between the fan inlet flow rate and the fan's total energy head. The total energy head represents the difference between the energy contained in a unit mass of air after passing through the compressor and its state before compression. By increasing compensation for parameters such as fan inlet temperature and exhaust pressure, the operating range of the fan's operating points is widened, improving the fan's effective energy.

[0078] For example, the anti-surge coordinate system is configured with a surge line, an anti-surge line, and an economic adjustment line. The operating point is generally located in the area between the minimum and maximum stator blade angles, and the operating point cannot exceed the straight line where the maximum pressure / power limit is located. This application ensures that the operating point of the fan is always below the surge line by setting an anti-surge line, and then makes the operating point of the fan as close as possible to the economic adjustment line, thereby ensuring that the fan's operating power is at the optimal value while also ensuring that the fan has a good energy-saving effect.

[0079] The step of inputting the historical surge point data into the model to be trained to obtain the anti-surge model includes the following sub-steps:

[0080] S210: Input the historical surge point data into the model to be trained, calculate the fan inlet flow rate and the total energy head corresponding to the fan when it is located at different surge points; calculate the air flow rate value sucked in by the blower at each surge point according to the typical flow rate calculation formula, that is, the fan inlet flow rate V.

[0081] The inlet flow rate V of the fan is:

[0082]

[0083] In the formula, PDI is the differential pressure at the throat of the fan; TIA is the inlet temperature of the fan; K1 is the inlet temperature compensation coefficient; P0 is the local atmospheric pressure where the fan is located; in this embodiment, K1 = 1.85.

[0084] Using the energy head theory of aerodynamics, the total energy head of the fan at different surge points was calculated. The total energy head of the fan is H.ad :

[0085]

[0086] In the formula, PIA is the exhaust pressure of the fan, and K is the isentropic index of air (the isentropic index of air at room temperature is 1.40), in this embodiment K = 1.38.

[0087] S220: Based on the fan inlet flow rate and the total energy head corresponding to the fan at different surge points, an anti-surge performance curve is constructed to obtain an anti-surge model. This application establishes a model with the fan inlet flow rate V as the abscissa and the fan total energy head H as the coordinate. ad Using the vertical axis as the ordinate, a dynamic surge plane coordinate point for the wind turbine is formed. This transforms the linear relationship on the conventional wind turbine operating condition monitoring screen, where the horizontal axis represents throat difference and the vertical axis represents exhaust pressure, into a dynamic relationship where the horizontal axis represents the wind turbine inlet flow rate V and the vertical axis represents the wind turbine total energy head H. ad The linear relationship was used to plot the surge curve of the blast furnace blower.

[0088] S300: Based on the anti-surge model, determine the anti-surge line of the fan; the anti-surge line is generated by shifting the horizontal coordinate of the fan's surge line in the anti-surge coordinate system to the right by a first preset unit and shifting the vertical coordinate downward by a first preset unit; in the anti-surge coordinate system, shift the horizontal coordinate of the fan inlet flow rate V to the right by 5%, and the total energy head H of the fan... ad Lower the margin by 5% and draw the anti-surge line for the wind turbine.

[0089] S400: Obtain the real-time inlet flow rate and total energy head of the fan to determine the real-time operating point of the fan.

[0090] S500: Determine whether the real-time operating point is below the anti-surge line. If not, adjust the opening of the anti-surge valve to 100%. If so, based on the real-time operating point, determine the anti-surge opening degree and the anti-surge valve opening time, and open the anti-surge valve according to the anti-surge valve opening time and control the anti-surge valve to operate at the anti-surge opening degree. It is understood that when the real-time operating point is above the anti-surge line, the opening of the anti-surge valve needs to be adjusted to 100% to quickly bring the real-time operating point below the anti-surge line.

[0091] Specifically, the step of determining the anti-surge opening degree and the anti-surge valve opening time based on the real-time operating point includes the following sub-steps:

[0092] S510: Based on the real-time operating point, obtain the historical operating point; the real-time operating point and the historical operating point differ by a first preset time; the first preset time is the interval between obtaining two adjacent operating points.

[0093] S520: Linearize the historical operating points and real-time operating points to obtain linear historical operating points and linear real-time operating points; linearize the historical operating points and real-time operating points to 0~100; VR4 / VR5 = historical operating point / real-time operating point ÷ 1800, where 1800 is the maximum flow rate of the wind turbine corresponding to this application, and the conversion facilitates dimensionless calculation of dynamic operating points.

[0094] S530: Based on the linear historical operating points and the linear real-time operating points, calculate the speed change at the real-time operating point; the speed change is:

[0095] VR6 = d(VR5 - VR4) ÷ dt;

[0096] In the formula, VR5 is the linear real-time operating point; VR4 is the linear historical operating point; t is the preset time; VR5-VR4 is the rate of change of the anti-surge adjustment deviation per second; the speed of the dynamic operating point is obtained by differentiating the anti-surge deviation, where the positive or negative value of VR6 represents the direction of the real-time operating point, such as rising is positive and falling is negative.

[0097] S540: Based on the speed change and the real-time operating point, determine the anti-surge opening degree and the anti-surge valve opening time.

[0098] The step of determining the anti-surge valve opening time based on the speed change and the real-time operating point includes the following sub-steps:

[0099] S541: Based on the anti-surge line, determine the comparison line; the comparison line is generated by shifting the horizontal coordinate of the anti-surge line of the fan in the anti-surge coordinate system to the left by a second preset unit and shifting the vertical coordinate upward by a second preset unit; the comparison line is located at a position 4% above the anti-surge line.

[0100] S542: Determine whether the real-time operating point is located above the comparison line. If so, open the anti-surge valve according to the second preset time. The second preset time is the time for quickly opening the anti-surge valve, which is the normal system setting time.

[0101] S543: If not, calculate the real-time operating point deviation; the real-time operating point deviation is:

[0102] VR8 = VR4 + 4 - VR5;

[0103] S544: If the real-time operating point deviation is 0, the anti-surge valve is opened according to the second preset time. When the fan is running normally, the VR8 value can only be greater than or equal to 0. When it is equal to 0, it means that the real-time operating point is very close to the anti-surge line. At this time, the anti-surge valve needs to be opened quickly according to the second preset time set by the system.

[0104] For example, the anti-surge valve includes a main anti-surge valve and a secondary anti-surge valve. After the step of opening the anti-surge valve according to the second preset time, the following steps are included:

[0105] S545: After the anti-surge valve is opened for the third preset time, if the real-time inlet flow of the blower decreases or the exhaust pressure of the blower increases, the opening of the main anti-surge valve is increased; if the real-time flow of the blower continues to decrease or the exhaust pressure continues to increase, the opening of the main anti-surge valve is further increased. The output value of this opening is 0% to 60%, and the corresponding opening of the main anti-surge valve is 0% to 100%.

[0106] S546: After the third preset time, if the real-time inlet flow rate of the blower decreases or the exhaust pressure of the blower increases, the secondary anti-surge valve is opened until the real-time operating point is below the anti-surge line. After the main anti-surge valve is opened for the third preset time, if the real-time flow rate of the blower continues to decrease or the exhaust pressure continues to increase, split-range control is adopted. When the opening output value is 40% to 100%, the corresponding opening degree of the secondary anti-surge valve is 0% to 100% until the real-time operating point returns to the safe control area, that is, below the anti-surge line.

[0107] In this embodiment, after the step of calculating the real-time operating point deviation, the following steps are included:

[0108] S547: If the real-time operating point deviation is greater than 0, determine whether the real-time operating point deviation is less than a first preset value.

[0109] S548: If so, the anti-surge valve is opened according to the fourth preset time; the fourth preset time is less than the second preset time.

[0110] S549: If not, determine whether the real-time operating point deviation is less than the second preset value; the second preset value is greater than the first preset value.

[0111] S550: If so, the anti-surge valve is opened according to the fifth preset time; the fifth preset time is greater than the second preset time.

[0112] S551: If not, then the anti-surge valve will not be opened.

[0113] Specifically, if the calculated real-time operating point deviation VR8 is positive, it represents the longitudinal distance between the real-time operating point and the surge line. The smaller the real-time operating point deviation VR8, the more dangerous the operating condition, and the faster the anti-surge valve needs to be opened. Conversely, the larger the real-time operating point deviation VR8, the safer the operating condition, and the anti-surge valve only needs to be opened slowly or not opened at all.

[0114] In this embodiment, after the step of calculating the real-time operating point deviation, the following step is further included:

[0115] S552: Determine whether the speed change is greater than 0. If so, calculate the comprehensive value of the real-time operating point deviation.

[0116] S553: ​​When the speed change is greater than or equal to 0.01, the comprehensive value of the real-time operating point deviation is:

[0117] VR9 = VR8 ÷ VR6.

[0118] S554: When the speed change is less than 0.01, the comprehensive value of the real-time operating point deviation is:

[0119] VR9 = VR8 ÷ 0.01.

[0120] S555: If the comprehensive value of the real-time operating point deviation is less than the third preset value, then the opening time of the anti-surge valve is reduced according to the fourth preset value.

[0121] After the step of determining whether the change in velocity is greater than 0, the following steps are included:

[0122] S556: If not, calculate the comprehensive value of the real-time operating point deviation; the comprehensive value of the real-time operating point deviation is:

[0123] VR9 = VR8 ÷ 0.01;

[0124] S557: If the comprehensive value of the real-time operating point deviation is less than the third preset value, the opening time of the anti-surge valve shall be increased according to the fourth preset value.

[0125] S558: If the comprehensive value of the real-time operating point deviation is greater than the third preset value, then the anti-surge valve is closed.

[0126] Specifically, calculate the comprehensive deviation value VR9 of the real-time operating point. When the speed of the real-time operating point V6 ≥ 0.01, VR9 = VR8 ÷ VR6; when V6 ≤ 0.01, VR9 = VR8 ÷ 0.01. If the speed change VR6 is positive, it means the real-time operating point is rising. The closer the real-time operating point is to the anti-surge line, the smaller the numerator (VR8) and VR9 become; the larger the denominator (VR6) is, the smaller VR9 becomes, and the faster the real-time operating point rises, indicating a more dangerous operating condition, requiring faster opening of the anti-surge valve. If the speed VR6 is negative, it means the real-time operating point is falling. At this time, VR8 gradually increases, and the value of VR9 becomes larger and larger, indicating a safer operating condition. In this case, it is only necessary to slowly open the anti-surge valve or not open it at all.

[0127] In this embodiment, the step of determining the anti-surge opening based on the real-time operating point includes the following sub-steps:

[0128] S560: Perform linear calculation on the comprehensive deviation value of the real-time operating point to obtain the deviation linear value; the deviation linear value represents the opening speed of the anti-surge valve; the larger the deviation linear value, the slower the opening speed of the anti-surge valve; the smaller the deviation linear value, the faster the opening speed of the anti-surge valve; perform linearized feedforward compensation on the comprehensive deviation value VR9 of the real-time operating point to obtain the deviation / rate of change denoted as VAR11, whose parameter is used to control the valve opening based on the ratio of the adjustment deviation to the rate of change of the deviation; the larger the comprehensive deviation value VR9 of the real-time operating point, the slower the opening speed of the anti-surge valve; the smaller the comprehensive deviation value VR9 of the real-time operating point, the faster the opening speed of the anti-surge valve.

[0129] S561: Based on the linear historical operating points and the linear real-time operating points, calculate the negative integral control value; similarly, control the anti-surge valve to close according to the magnitude of the adjustment deviation, which is equivalent to negative integral control in PID regulation. The output value is denoted as VAR12, and VAR12 is less than or equal to 0. Its magnitude determines the speed of valve closure. The negative integral control value VAR12 is:

[0130] VAR12 = (VR5 - VR4) ÷ VR4;

[0131] S562: Based on the anti-surge model, determine the surge warning line of the wind turbine; the surge warning line is generated by shifting the horizontal coordinate of the anti-surge line of the wind turbine in the anti-surge coordinate system to the right by a third preset unit and shifting the vertical coordinate downward by a third preset unit; in this application, a surge warning line is established with a 2% margin below the anti-surge line.

[0132] S563: Based on the real-time operating point and the surge warning line, determine the valve opening value according to the real-time anti-surge opening of the anti-surge valve; when the real-time operating point is located on the surge warning line, the valve opening value is greater than or equal to 0; when the real-time operating point is not located on the surge warning line, the valve opening value is less than or equal to 0; when the real-time operating point reaches the surge warning line, set the variable @PRE_SURGE_ALM to 1, indicating that the fan is about to enter a dangerous operating condition, and quickly open the valve to make its output opening value VAR14, VAR14≥0, which represents a positive derivative; when the real-time operating point is not reached the surge warning line, set the variable @PRE_SURGE_ALM to 0, close the valve and make its opening value VAR13, VAR13≤0, which represents a negative derivative.

[0133] S564: Determine the anti-surge opening based on the aforementioned deviation linearity value, negative integral control value, and valve opening value;

[0134] VAR15=VAR14+(VAR11+VAR12+VAR13)×0.1;

[0135] In the formula, VAR11 is the deviation linearity value; VAR12 is the negative integral control value; VAR13 is the valve opening value; and VAR14 is the real-time anti-surge opening. Specifically, VAR11 + VAR12 + VAR13 represent the rate of change of the anti-surge valve opening within 0.1 seconds. This anti-surge control strategy allows for more precise adjustment of the anti-surge valve opening, providing timely response and smooth adjustment, thus better utilizing the fan's performance.

[0136] For example, the anti-surge coordinate system is further configured with an economic adjustment line; the economic adjustment line represents the linear relationship between the fan inlet flow rate and the total energy head of the fan when the fan is at its minimum power under different stator blade openings; by recording surge point data such as fan throat differential pressure, exhaust pressure, and inlet temperature corresponding to positions with stator blade openings of 30%, 40%, 50%, and 60% (positions can vary, and multiple points can be added), the economic adjustment line is plotted in the anti-surge coordinate system. The method further includes the following steps:

[0137] S600: Based on the anti-surge model, the stator blade opening of the fan is adjusted so that the real-time operating point of the fan is close to the economic adjustment line. The economic adjustment line drawn in this application is located below the anti-surge line. The minimum power value at different stator blade angles is recorded through start-up experiments to establish the economic adjustment line of the fan. During normal operation of the fan, the stator blade is adjusted by the PID controller to keep the operating point near the economic adjustment line, so that the fan has a good energy-saving effect.

[0138] This application provides an anti-surge control method. Combining the currently used surge curve plotted with throat differential pressure as the x-axis and exhaust pressure as the y-axis, it offers a performance-improved surge curve. This method incorporates compensation from parameters such as atmospheric pressure, fan inlet temperature, and inlet pressure, thereby expanding the fan's operating point adjustment range. A new fan surge curve, the anti-surge model, is formed by combining fluid dynamics and fan energy head theory. The anti-surge curve is obtained by shifting the surge curve coordinates downwards by a certain margin. Furthermore, to ensure economical and efficient fan operation, an economic adjustment curve is established below the anti-surge curve based on experiments with multiple stationary blade angles and minimum power. A PID controller adjusts the valves to keep the operating point near the economic adjustment curve, further maximizing the fan's economic efficiency. The PLC calculates the displacement and velocity values ​​between the operating point and the anti-surge curve in real time, and simultaneously adjusts the valve action rapidly based on the anti-surge output, achieving precise anti-surge control for the blower.

[0139] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A surge control method, characterized in that, include: Obtain historical surge point data; The surge point historical data includes: the differential pressure at the fan throat, the exhaust pressure, and the inlet temperature corresponding to different stator blade openings of the fan; The historical surge point data is input into the model to be trained to obtain the anti-surge model; the anti-surge model is configured with an anti-surge coordinate system; the surge line of the wind turbine is configured in the anti-surge coordinate system; the surge line represents the linear relationship between the inlet flow rate of the wind turbine and the total energy head of the wind turbine; Based on the anti-surge model, the anti-surge line of the fan is determined; the anti-surge line is generated by shifting the horizontal coordinate of the surge line of the fan located in the anti-surge coordinate system to the right by a first preset unit and shifting the vertical coordinate downward by a first preset unit. Obtain the real-time inlet flow rate and total energy head of the fan to determine the real-time operating point of the fan; Determine whether the real-time operating point is below the anti-surge line. If not, adjust the opening of the anti-surge valve to 100%. If so, determine the anti-surge opening and the anti-surge valve opening time based on the real-time operating point, and open the anti-surge valve according to the anti-surge valve opening time and control the anti-surge valve to operate at the anti-surge opening.

2. The anti-surge control method according to claim 1, characterized in that, The step of inputting the historical surge point data into the model to be trained to obtain the anti-surge model includes: The historical surge point data is input into the model to be trained to calculate the inlet flow rate of the wind turbine and the total energy head corresponding to the wind turbine at different surge points. The inlet flow rate of the fan is: In the formula, PDI is the differential pressure at the fan throat; TIA is the fan inlet temperature; K1 is the inlet temperature compensation coefficient; and P0 is the local atmospheric pressure where the fan is located. The total energy head of the wind turbine is: In the formula, PIA is the exhaust pressure of the fan, and K is the isentropic index of air; Based on the inlet flow rate of the fan and the total energy head corresponding to the fan at different surge points, anti-surge performance curves are constructed to obtain an anti-surge model.

3. The anti-surge control method according to claim 1, characterized in that, The anti-surge coordinate system is also equipped with an economic adjustment line; the economic adjustment line represents the linear relationship between the fan inlet flow rate and the total energy head of the fan when the fan is at its minimum power under different stator blade openings. The method further includes: Based on the anti-surge model, the opening of the fan's stator blades is adjusted so that the fan's real-time operating point is close to the economic adjustment line.

4. The anti-surge control method according to claim 1, characterized in that, The step of determining the anti-surge opening degree and the anti-surge valve opening time based on the real-time operating point includes: Based on the real-time operating point, historical operating points are obtained; the real-time operating point and the historical operating point differ by a first preset time. The historical operating points and real-time operating points are linearized to obtain linear historical operating points and linear real-time operating points. Based on the linear historical operating points and the linear real-time operating points, the speed change at the real-time operating point is calculated; the speed change is: VR6 = d(VR5 - VR4) ÷ dt; In the formula, VR5 is the linear real-time operating point; VR4 is the linear historical operating point; t is the preset time; Based on the speed change and the real-time operating point, the anti-surge opening degree and the anti-surge valve opening time are determined.

5. The anti-surge control method according to claim 4, characterized in that, The step of determining the anti-surge valve opening time based on the speed change and the real-time operating point includes: Based on the anti-surge line, a comparison line is determined; the comparison line is generated by shifting the horizontal coordinate of the anti-surge line of the fan located in the anti-surge coordinate system to the left by a second preset unit and shifting the vertical coordinate upward by a second preset unit. Determine whether the real-time operating point is located above the comparison line. If so, open the anti-surge valve according to the second preset time. If not, then calculate the real-time operating point deviation; the real-time operating point deviation is: VR8 = VR4 + 4 - VR5; If the deviation of the real-time operating point is 0, the anti-surge valve will be opened according to the second preset time.

6. The anti-surge control method according to claim 5, characterized in that, The anti-surge valve includes: a main anti-surge valve and a secondary anti-surge valve; After the step of opening the anti-surge valve according to the second preset time, the following steps are included: After the anti-surge valve has been opened for a third preset time, if the real-time inlet flow of the fan decreases or the exhaust pressure of the fan increases, the opening degree of the main anti-surge valve shall be increased. After the third preset time, if the real-time inlet flow of the fan decreases or the exhaust pressure of the fan increases, the secondary anti-surge valve will be opened until the real-time operating point is below the anti-surge line.

7. The anti-surge control method according to claim 5, characterized in that, After the step of calculating the real-time operating point deviation, the following steps are included: If the real-time operating point deviation is greater than 0, determine whether the real-time operating point deviation is less than a first preset value; If so, the anti-surge valve will be opened according to the fourth preset time; the fourth preset time is less than the second preset time. If not, then determine whether the deviation of the real-time operating point is less than the second preset value; the second preset value is greater than the first preset value. If so, the anti-surge valve will be opened according to the fifth preset time; the fifth preset time is greater than the second preset time. If not, the anti-surge valve will not be opened.

8. The anti-surge control method according to claim 7, characterized in that, After the step of calculating the real-time operating point deviation, the method further includes: Determine whether the speed change is greater than 0. If so, calculate the comprehensive value of the real-time operating point deviation. When the speed change is greater than or equal to 0.01, the comprehensive value of the real-time operating point deviation is: VR9 = VR8 ÷ VR6; When the speed change is less than 0.01, the comprehensive value of the real-time operating point deviation is: VR9 = VR8 ÷ 0.01; If the comprehensive deviation value of the real-time operating point is less than the third preset value, the opening time of the anti-surge valve is reduced according to the fourth preset value.

9. The anti-surge control method according to claim 8, characterized in that, After the step of determining whether the change in velocity is greater than 0, the following steps are included: If not, then calculate the comprehensive value of the real-time operating point deviation; the comprehensive value of the real-time operating point deviation is: VR9 = VR8 ÷ 0.01; If the comprehensive value of the real-time operating point deviation is less than the third preset value, the opening time of the anti-surge valve is increased according to the fourth preset value. If the comprehensive deviation value of the real-time operating point is greater than the third preset value, then the anti-surge valve is closed.

10. The anti-surge control method according to claim 9, characterized in that, The step of determining the anti-surge opening based on the real-time operating point includes: A linear operation is performed on the comprehensive deviation value of the real-time operating point to obtain the deviation linear value; the deviation linear value represents the opening speed of the anti-surge valve; the larger the deviation linear value, the slower the opening speed of the anti-surge valve; the smaller the deviation linear value, the faster the opening speed of the anti-surge valve. Based on the linear historical operating points and the linear real-time operating points, the negative integral control value is calculated; the negative integral control value is: VAR12 = (VR5 - VR4) ÷ VR4; Based on the anti-surge model, the surge warning line of the wind turbine is determined; the surge warning line is generated by shifting the horizontal coordinate of the anti-surge line of the wind turbine in the anti-surge coordinate system to the right by a third preset unit and shifting the vertical coordinate downward by a third preset unit. Based on the real-time operating point and the surge warning line, the valve opening value is determined according to the real-time anti-surge opening of the anti-surge valve; when the real-time operating point is located on the surge warning line, the valve opening value is greater than or equal to 0; when the real-time operating point is not located on the surge warning line, the valve opening value is less than or equal to 0. Based on the aforementioned deviation linearity value, negative integral control value, and valve opening value, the anti-surge opening is determined; VAR15=VAR14+(VAR11+VAR12+VAR13)×0.1; In the formula, VAR11 is the deviation linearity value; VAR12 is the negative integral control value; VAR13 is the valve opening value; and VAR14 is the real-time anti-surge opening.

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