A double-shaft extension centrifugal heat pump unit double-guide vane control method and system

Abstract

The application relates to the technical field of heat pump unit control, in particular to a double-shaft extension centrifugal heat pump unit double-guide vane control method and system, which comprises the following steps: defining pressure detection values and water outlet temperature data; determining key pressure difference parameters based on the pressure detection values, respectively calculating and analyzing guide vane surge correction amounts of a first-stage throttling pressure difference Delta P1, a first-stage pressure difference Delta P2, a second-stage throttling pressure difference Delta P3 and a second-stage pressure difference Delta P4, obtaining a surge correction amount Ks1 and a surge correction amount Ks2; calculating a PID calculation value according to the water outlet temperature data, and cumulatively calculating the PID calculation value and the surge correction amount Ks1 to obtain a first-stage guide vane opening Opn1%; inputting the PID calculation value and the surge correction amount Ks1 into a guide vane opening calculation formula to obtain a second-stage guide vane opening Opn2%; taking the first-stage pressure difference Delta P2, a first real pressure difference value, the second-stage pressure difference Delta P4 and a second real pressure difference value as input values of a PI control algorithm to obtain a guide vane opening correction amount. The application improves the operation efficiency of the double-shaft extension centrifugal heat pump unit.

Description

Technical Field

[0001] This application relates to the technical field of heat pump unit control, and in particular to a dual-guide vane control method and system for a dual-shaft centrifugal heat pump unit. Background Technology

[0002] Twin-shaft centrifugal heat pump units are widely used in industrial heating / cooling, district heating, and other fields due to their high efficiency and high-load operation advantages. One of the core control components of this type of unit is guide vane control. Two guide vanes are installed at the inlet of the first-stage and second-stage impellers, respectively, and their opening adjustment directly affects the unit's load adaptability, surge protection effect, and operating efficiency.

[0003] In existing technologies, guide vane control of twin-shaft centrifugal heat pump units mostly adopts a single PID regulation method based on load demand, that is, adjusting the guide vane opening according to the feedback of the outlet water temperature of the unit for heating or cooling. However, in actual operation, the unit faces complex factors such as fluctuations in operating conditions and changes in medium characteristics. PID regulation based solely on load feedback is insufficient to simultaneously address surge protection and efficiency optimization: on the one hand, when the unit is operating at low load or under varying conditions, the airflow state at the impeller inlet is prone to sudden changes, leading to abnormal throttling pressure differences, which in turn triggers surge, seriously affecting the unit's operational stability; on the other hand, existing control methods do not fully consider the coordinated operation relationship between the first and second stage guide vanes, and do not perform closed-loop correction for the actual operating state of the pressure difference between the two stages, resulting in unbalanced forces on the two-stage impellers, low overall unit operating efficiency, and failure to achieve optimal energy consumption levels. Summary of the Invention

[0004] To address at least one of the aforementioned technical problems, this application provides a dual-guide vane control method and system for a dual-shaft centrifugal heat pump unit.

[0005] In a first aspect, this application provides a dual-guide-vane control method for a dual-shaft centrifugal heat pump unit, employing the following technical solution:

[0006] Define the pressure detection value of the heat pump unit and the outlet water temperature data when heating or cooling. The pressure detection value includes the inlet pressure Pe of the first stage guide vane, the pressure P1 of the first stage impeller, the first stage compression exhaust pressure P2, the pressure P3 of the second stage impeller, and the second stage compression exhaust pressure Pc.

[0007] Based on the pressure detection values, key differential pressure parameters are determined. These key differential pressure parameters include first-stage throttling differential pressure ΔP1, first-stage differential pressure ΔP2, second-stage throttling differential pressure ΔP3, and second-stage differential pressure ΔP4. The first-stage throttling differential pressure ΔP1 = inlet pressure Pe of the first-stage guide vane - pressure P1 of the first-stage impeller. The first-stage differential pressure ΔP2 = first-stage compression exhaust pressure P2 - pressure P1 of the first-stage impeller. The second-stage throttling differential pressure ΔP3 = first-stage compression exhaust pressure P2 - pressure P3 of the second-stage impeller. The second-stage differential pressure ΔP4 = second-stage compression exhaust pressure Pc - pressure P3 of the second-stage impeller.

[0008] The surge correction amount of the guide vane is calculated and analyzed for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3 and the second-stage pressure difference ΔP4 respectively, and the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane are obtained.

[0009] The PID calculation value of the first-stage guide vane is calculated based on the outlet water temperature data, and the PID calculation value is accumulated with the surge correction amount Ks1 to obtain the first-stage guide vane opening Opn1%;

[0010] The first-stage guide vane opening Opn1% and the surge correction amount Ks2 are input into the guide vane opening calculation formula to obtain the second-stage guide vane opening Opn2%. The guide vane opening calculation formula is Opn2%=K1×Opn1%+K2+Ks2+Ke2, where K1 is the opening following coefficient of the second-stage guide vane, K2 is the start-up opening of the second-stage guide vane, and Ke2 is the efficiency correction amount of the second-stage guide vane. The opening following coefficient K1 and the start-up opening K2 of the second-stage guide vane are preset fixed values ​​based on the rated operating parameters of the heat pump unit.

[0011] Obtain the first true pressure difference value corresponding to the first-stage pressure difference ΔP2 and the second true pressure difference value corresponding to the second-stage pressure difference ΔP4, and use the first-stage pressure difference ΔP2, the first true pressure difference value, the second-stage pressure difference ΔP4 and the second true pressure difference value as input quantities of the PI control algorithm. Output the guide vane opening correction quantity through the PI control algorithm. The guide vane opening correction quantity includes the first-stage guide vane opening correction quantity and the second-stage guide vane opening correction quantity.

[0012] The first-stage guide vane opening Opn1 is adjusted according to the first-stage guide vane opening correction amount, and the second-stage guide vane opening Opn2 is adjusted according to the second-stage guide vane opening correction amount.

[0013] By adopting the above technical solution, a complete set of pressure detection values ​​and key differential pressure parameters are first defined, clarifying the calculation logic of throttling differential pressure and working differential pressure at each level, providing accurate data support for dual guide vane regulation. Then, a graded collaborative regulation mechanism is constructed through PID calculation of the first-stage guide vane and accumulation of surge correction, and calculation of the second-stage guide vane's dedicated opening formula. The two-stage guide vanes respond to load and surge protection requirements respectively, and form a linkage through opening follow-up, enabling the guide vane opening regulation to accurately match heating / cooling load changes, effectively adapting to complex operating condition fluctuations, and significantly improving the accuracy and flexibility of load regulation. Surge trigger judgments are set for the first and second-stage throttling differential pressures, with the corresponding working differential pressures (ΔP2, ΔP4) as the core parameters of the surge correction curve, and the correction amounts Ks1 and Ks2 are dynamically calculated in combination with preset time intervals. This design precisely links surge correction to the actual operating state of the two-stage guide vanes, enabling real-time capture of abnormal pressure difference changes and early triggering of corrective actions. Compared to fixed threshold schemes, it offers more targeted protection against surge risks, significantly improving the unit's operational stability and reliability under low load and variable operating conditions. The theoretical and actual pressure difference values ​​are input into the PI control algorithm, which utilizes historical anomaly data modeling, parameter grouping optimization, and coefficient mean calculation to form a closed-loop correction mechanism for guide vane opening. This mechanism dynamically compensates for deviations between theoretical and actual pressure differences, balances the forces on the two-stage impellers, avoids single-stage overload or operational imbalance, and solves the efficiency loss problem caused by the lack of closed-loop correction in existing technologies. This allows the unit to achieve optimal operating efficiency and significantly reduces energy consumption.

[0014] In one possible implementation, the calculation and analysis of guide vane surge correction amounts for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4, respectively, to obtain the surge correction amount Ks1 for the first-stage guide vane and the surge correction amount Ks2 for the second-stage guide vane, includes:

[0015] Determine whether the first-stage throttling pressure difference ΔP1 is greater than the first preset reference value. If it is greater, then use the first-stage pressure difference ΔP2 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the first-stage guide vane according to the preset surge correction curve at preset time intervals to obtain the surge correction of the first-stage guide vane Ks1.

[0016] Determine whether the secondary throttling pressure difference ΔP3 is greater than the first preset reference value. If it is, use the secondary pressure difference ΔP4 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the secondary guide vane according to the preset time interval based on the preset surge correction curve to obtain the surge correction of the secondary guide vane Ks2.

[0017] In one possible implementation, the preset surge correction curve is a two-dimensional coordinate system curve, where the X-axis of the two-dimensional coordinate system is the pressure difference parameter, and the Y-axis is the surge correction amount Ks. The X-axis includes three key nodes: X1, X2, and X3. X2 is the reference pressure difference determined based on the operating condition calculation value of the heat pump unit; X1 is the safety critical pressure difference, calculated using the formula X1 = X2 - operating condition deviation; and X3 is the surge critical pressure difference, calculated using the formula X3 = X2 + surge margin. The Y-axis is set with a key parameter Y1, which is the maximum surge correction amount, calculated from the operating condition of the heat pump unit.

[0018] The preset surge correction curve is generated by a two-point fitting algorithm. The fitting reference points are (X1,0) and (X3,Y1). That is, when the pressure difference parameter is X1, the surge correction Ks is 0, and when the pressure difference parameter is X3, the surge correction Ks = Y1.

[0019] In one possible implementation, the step of using the first-stage pressure difference ΔP2, the first true pressure difference value, the second-stage pressure difference ΔP4, and the second true pressure difference value as inputs to a PI control algorithm, and outputting a guide vane opening correction value through the PI control algorithm, includes:

[0020] Calculate the first pressure difference between the first-level pressure difference ΔP2 and the first true pressure difference value, and the second pressure difference between the second-level pressure difference ΔP4 and the second true pressure difference value, and determine whether the first pressure difference value and the second pressure difference value meet the preset error value range.

[0021] If neither the first differential pressure value nor the second differential pressure value falls within the preset error value range, then the historical operating data of the heat pump unit is obtained, and it is determined that there is an abnormal differential pressure parameter group in the historical operating data whose differential pressure value exceeds the preset error value range.

[0022] The abnormal pressure difference parameter and the actual pressure difference parameter in the abnormal pressure difference parameter group are respectively grouped into two groups according to the operating timeline of the heat pump unit to obtain the sample parameter group;

[0023] The abnormal pressure difference parameters and the true pressure difference parameters from the multiple sample parameter groups are respectively input into the PI control algorithm for calculation to obtain the proportional coefficient and integral coefficient of the PI control algorithm.

[0024] Based on the calculated proportional coefficient and integral coefficient, combined with the abnormal pressure difference parameter and the actual pressure difference parameter, a pressure difference sequence table is generated;

[0025] The first-level pressure difference ΔP2 and the first actual pressure difference value, and the second-level pressure difference ΔP4 and the second actual pressure difference value are respectively grouped in pairs according to the operation timeline to obtain the parameter group to be optimized;

[0026] The first-level pressure difference ΔP2 and the second-level pressure difference ΔP4 in the parameter group to be optimized are corrected and optimized according to the pressure difference sequence table to obtain the optimized first-level pressure difference ΔP2 and the optimized second-level pressure difference ΔP4.

[0027] Based on the optimized first-stage pressure difference ΔP2 and the optimized second-stage pressure difference ΔP4, the first-stage guide vane opening Opn1% and the second-stage guide vane opening Opn2% are updated and calculated to obtain the updated first-stage guide vane opening and the updated second-stage guide vane opening.

[0028] The correction amount for the first-stage guide vane opening is obtained by performing a correction calculation based on the updated first-stage guide vane opening and the original first-stage guide vane opening. The correction amount for the second-stage guide vane opening is obtained by performing a correction calculation based on the updated second-stage guide vane opening and the original second-stage guide vane opening.

[0029] In one possible implementation, the step of correcting and optimizing the primary pressure difference ΔP2 and the secondary pressure difference ΔP4 in the parameter set to be optimized according to the pressure difference sequence list to obtain the optimized primary pressure difference ΔP2 and the optimized secondary pressure difference ΔP4 includes:

[0030] The pressure difference is calculated between the abnormal pressure difference parameter and the true pressure difference parameter in each row of the pressure difference sequence table to obtain the first sample pressure difference value corresponding to the first-stage guide vane and the second sample pressure difference value corresponding to the second-stage guide vane.

[0031] Based on the first pressure difference value, the first sample pressure difference value is compared and filtered to obtain the first parameter data group in the pressure difference sequence table whose pressure difference value meets the preset difference deviation range;

[0032] Based on the second pressure difference value, the second sample pressure difference value is compared and filtered to obtain the second parameter data group in the pressure difference sequence table whose pressure difference value meets the preset difference deviation range;

[0033] The average values ​​of the proportional coefficients and integral coefficients in the first parameter data group and the second parameter data group are calculated respectively to obtain the average value of the first proportional coefficient and the average value of the first integral coefficient corresponding to the first parameter data group, and the average value of the second proportional coefficient and the average value of the second integral coefficient corresponding to the second parameter data group.

[0034] The first true differential pressure value, the average value of the first integral coefficient, and the average value of the first proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized first-level differential pressure ΔP2.

[0035] The second true differential pressure value, the average value of the second integral coefficient, and the average value of the second proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized secondary differential pressure ΔP4.

[0036] Secondly, this application provides a dual-guide-vane control system for a dual-shaft centrifugal heat pump unit, which adopts the following technical solution:

[0037] A dual-guide-vane control system for a dual-shaft centrifugal heat pump unit includes:

[0038] The standard definition module is used to define the pressure detection values ​​of the heat pump unit and the outlet water temperature data when heating or cooling. The pressure detection values ​​include the inlet pressure Pe of the first-stage guide vane, the pressure P1 of the first-stage impeller, the first-stage compression exhaust pressure P2, the pressure P3 of the second-stage impeller, and the second-stage compression exhaust pressure Pc.

[0039] The differential pressure determination module is used to determine key differential pressure parameters based on the pressure detection value. The key differential pressure parameters include primary throttling differential pressure ΔP1, primary differential pressure ΔP2, secondary throttling differential pressure ΔP3, and secondary differential pressure ΔP4. The primary throttling differential pressure ΔP1 = inlet pressure Pe of the primary guide vane - pressure P1 of the primary impeller; the primary differential pressure ΔP2 = primary compression exhaust pressure P2 - pressure P1 of the primary impeller; the secondary throttling differential pressure ΔP3 = primary compression exhaust pressure P2 - pressure P3 of the secondary impeller; the secondary differential pressure ΔP4 = secondary compression exhaust pressure Pc - pressure P3 of the secondary impeller.

[0040] The correction calculation module is used to calculate and analyze the guide vane surge correction amount for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4, respectively, to obtain the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane.

[0041] The first opening calculation module is used to calculate the PID calculation value of the first-stage guide vane based on the outlet water temperature data, and to accumulate the PID calculation value with the surge correction amount Ks1 to obtain the first-stage guide vane opening Opn1%;

[0042] The second opening calculation module is used to input the first-stage guide vane opening Opn1% and the surge correction amount Ks2 into the guide vane opening calculation formula for calculation to obtain the second-stage guide vane opening Opn2%. The guide vane opening calculation formula is Opn2%=K1×Opn1%+K2+Ks2+Ke2, where K1 is the opening following coefficient of the second-stage guide vane, K2 is the start-up opening of the second-stage guide vane, and Ke2 is the efficiency correction amount of the second-stage guide vane. The opening following coefficient K1 and the start-up opening K2 of the second-stage guide vane are preset fixed values ​​based on the rated operating parameters of the heat pump unit.

[0043] The real pressure difference acquisition module is used to acquire the first real pressure difference value corresponding to the first-level pressure difference ΔP2 and the second real pressure difference value corresponding to the second-level pressure difference ΔP4, and use the first-level pressure difference ΔP2, the first real pressure difference value, the second-level pressure difference ΔP4 and the second real pressure difference value as input quantities of the PI control algorithm, and output the guide vane opening correction quantity through the PI control algorithm. The guide vane opening correction quantity includes the first-level guide vane opening correction quantity and the second-level guide vane opening correction quantity.

[0044] The opening adjustment module is used to adjust the opening of the first-stage guide vane Opn1% according to the first-stage guide vane opening correction amount, and to adjust the opening of the second-stage guide vane Opn2 according to the second-stage guide vane opening correction amount.

[0045] In one possible implementation, when the correction calculation module performs guide vane surge correction calculation and analysis on the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4 respectively, to obtain the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane, it is specifically used for:

[0046] Determine whether the first-stage throttling pressure difference ΔP1 is greater than the first preset reference value. If it is greater, then use the first-stage pressure difference ΔP2 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the first-stage guide vane according to the preset surge correction curve at preset time intervals to obtain the surge correction of the first-stage guide vane Ks1.

[0047] Determine whether the secondary throttling pressure difference ΔP3 is greater than the first preset reference value. If it is, use the secondary pressure difference ΔP4 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the secondary guide vane according to the preset time interval based on the preset surge correction curve to obtain the surge correction of the secondary guide vane Ks2.

[0048] Thirdly, this application provides an electronic device that adopts the following technical solution:

[0049] At least one processor;

[0050] Memory;

[0051] At least one application, wherein the at least one application is stored in memory and configured to be executed by at least one processor, the at least one application being configured to: execute a dual-guide vane control method for a twin-shaft centrifugal heat pump unit as described in any of the first aspects.

[0052] Fourthly, this application provides a computer-readable storage medium, which adopts the following technical solution:

[0053] A computer-readable storage medium storing a computer program that can be loaded by a processor and executed by any one of the first aspects of a dual-shaft centrifugal heat pump unit with dual guide vane control method.

[0054] In summary, this application includes at least one of the following beneficial technical effects:

[0055] By adopting the above technical solution, a complete set of pressure detection values ​​and key differential pressure parameters are first defined, clarifying the calculation logic of throttling differential pressure and working differential pressure at each level, providing accurate data support for dual guide vane regulation. Then, a graded collaborative regulation mechanism is constructed through PID calculation of the first-stage guide vane and accumulation of surge correction, and calculation of the second-stage guide vane's dedicated opening formula. The two-stage guide vanes respond to load and surge protection requirements respectively, and form a linkage through opening follow-up, enabling the guide vane opening regulation to accurately match heating / cooling load changes, effectively adapting to complex operating condition fluctuations, and significantly improving the accuracy and flexibility of load regulation. Surge trigger judgments are set for the first and second-stage throttling differential pressures, with the corresponding working differential pressures (ΔP2, ΔP4) as the core parameters of the surge correction curve, and the correction amounts Ks1 and Ks2 are dynamically calculated in combination with preset time intervals. This design precisely links surge correction to the actual operating state of the two-stage guide vanes, enabling real-time capture of abnormal pressure difference changes and early triggering of corrective actions. Compared to fixed threshold schemes, it offers more targeted protection against surge risks, significantly improving the unit's operational stability and reliability under low load and variable operating conditions. The theoretical and actual pressure difference values ​​are input into the PI control algorithm, which utilizes historical anomaly data modeling, parameter grouping optimization, and coefficient mean calculation to form a closed-loop correction mechanism for guide vane opening. This mechanism dynamically compensates for deviations between theoretical and actual pressure differences, balances the forces on the two-stage impellers, avoids single-stage overload or operational imbalance, and solves the efficiency loss problem caused by the lack of closed-loop correction in existing technologies. This allows the unit to achieve optimal operating efficiency and significantly reduces energy consumption. Attached Figure Description

[0056] Figure 1 This is a flowchart illustrating a dual-guide-vane control method for a dual-shaft centrifugal heat pump unit provided in an embodiment of this application.

[0057] Figure 2 This is a schematic diagram of the structure of a dual-guide vane control system for a dual-shaft centrifugal heat pump unit provided in an embodiment of this application.

[0058] Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0059] Figure 4A schematic diagram of the preset surge correction curve for a dual-guide vane control method for a dual-shaft centrifugal heat pump unit provided in this application embodiment. Detailed Implementation

[0060] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0061] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of this application.

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0064] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0065] This application provides a dual-guide-vane control method for a dual-shaft centrifugal heat pump unit, executed by electronic equipment, such as... Figure 1 As shown, the method includes:

[0066] Step S10: Define the pressure detection value of the heat pump unit and the outlet water temperature data when heating or cooling.

[0067] The pressure detection values ​​include the inlet pressure Pe of the first-stage guide vane, the pressure P1 of the first-stage impeller, the first-stage compression exhaust pressure P2, the pressure P3 of the second-stage impeller, and the second-stage compression exhaust pressure Pc.

[0068] In this embodiment of the application, the pressure detection value and outlet water temperature data of the heat pump unit are defined as the pre-set pressure detection value and outlet water temperature data.

[0069] Step S11: Determine key differential pressure parameters based on pressure detection values.

[0070] The key differential pressure parameters include the first-stage throttling differential pressure ΔP1, the first-stage differential pressure ΔP2, the second-stage throttling differential pressure ΔP3, and the second-stage differential pressure ΔP4. The first-stage throttling differential pressure ΔP1 = the inlet pressure Pe of the first-stage guide vane - the pressure P1 of the first-stage impeller. The first-stage differential pressure ΔP2 = the first-stage compression exhaust pressure P2 - the pressure P1 of the first-stage impeller. The second-stage throttling differential pressure ΔP3 = the first-stage compression exhaust pressure P2 - the pressure P3 of the second-stage impeller. The second-stage differential pressure ΔP4 = the second-stage compression exhaust pressure Pc - the pressure P3 of the second-stage impeller.

[0071] In this embodiment, the first-stage throttling pressure difference ΔP1 reflects the throttling loss between the first-stage guide vane inlet and the first-stage impeller; the first-stage pressure difference ΔP2 reflects the pressure rise during the first-stage compression process; the second-stage throttling pressure difference ΔP3 reflects the throttling loss between the first-stage exhaust and the second-stage impeller; and the second-stage pressure difference ΔP4 reflects the pressure rise during the second-stage compression process. During stable operation of the heat pump unit, the maximum range of ΔP1 is 0.01-100 kPa, ΔP2 is 300-500 kPa, ΔP3 is 0.01-100 kPa, and ΔP4 is 300-500 kPa.

[0072] Step S12: Calculate and analyze the surge correction amount of the guide vane for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4 respectively, and obtain the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane.

[0073] Specifically, it is determined whether the first-stage throttling pressure difference ΔP1 is greater than the first preset reference value. If it is, the first-stage pressure difference ΔP2 in the key pressure difference parameters is used as the transverse parameter of the preset surge correction curve. The surge correction amount of the first-stage guide vane is calculated according to the preset surge correction curve at preset time intervals to obtain the surge correction amount Ks1 of the first-stage guide vane. It is also determined whether the second-stage throttling pressure difference ΔP3 is greater than the first preset reference value. If it is, the second-stage pressure difference ΔP4 in the key pressure difference parameters is used as the transverse parameter of the preset surge correction curve. The surge correction amount of the second-stage guide vane is calculated according to the preset surge correction curve at preset time intervals to obtain the surge correction amount Ks2 of the second-stage guide vane.

[0074] In this embodiment, the first preset reference value is 0.03 MPa (based on the rated operating condition calibration of the unit), the preset time interval is 0.5 s, and the surge correction amount is calculated using a preset surge correction curve. The specific process is as follows:

[0075] As attached Figure 4As shown, the preset surge correction curve is a two-dimensional coordinate system curve. The X-axis includes three key nodes: X1, X2, and X3. X2 is the reference pressure difference determined based on the operating condition calculation value of the heat pump unit. X1 is the safety critical pressure difference, calculated by the formula X1 = X2 - operating condition deviation. X3 is the surge critical pressure difference, calculated by the formula X3 = X2 + surge margin. The Y-axis sets the key parameter Y1, which is the maximum value of the surge correction. The maximum correction value of the Y-axis is Y1 = 8.000000.

[0076] Determine whether the first-stage throttling pressure difference ΔP1 is greater than the second preset reference value (0.01MPa): If ΔP1>0.01MPa, it indicates that there is a surge correction significance on the first-stage side. Using ΔP2 as the transverse parameter of the preset surge correction curve, the surge correction amount Ks1 of the first-stage guide vane is obtained by querying the curve at 0.5s intervals; if ΔP1≤0.01MPa, Ks1=0.000000.

[0077] Determine whether the secondary throttling pressure difference ΔP3 is greater than the second preset reference value (0.01MPa): If ΔP3>0.01MPa, it indicates that there is a surge correction significance on the secondary side. Using ΔP4 as the transverse parameter of the preset surge correction curve, the surge correction amount Ks2 of the secondary guide vane is obtained by querying the curve at 0.5s intervals; if ΔP3≤0.01MPa, Ks2=0.000000.

[0078] In this embodiment, if ΔP1=0.06MPa (greater than 0.03MPa) and ΔP2=5.5, then the curve yields Ks1=1.500000; if ΔP3=0.05MPa (greater than 0.03MPa) and ΔP4=6.2, then the curve yields Ks2=2.200000.

[0079] Step S13: Calculate the PID calculation value of the first-stage guide vane based on the outlet water temperature data, and accumulate the PID calculation value with the surge correction amount Ks1 to obtain the opening degree Opn1 of the first-stage guide vane.

[0080] Specifically, a PID control algorithm is used, with the deviation between the outlet water temperature data and the preset target value as input, to calculate the PID calculation value of the first-stage guide vane. The preset PID parameters are: proportional coefficient Kp = 2.5, integral coefficient Ki = 0.1, and derivative coefficient Kd = 0.05. The formula for calculating the first-stage guide vane opening is: Opn1% = PID calculation value + Ks1.

[0081] For example: Under heating conditions, the measured value of the outlet water temperature is 53℃, which is -2℃ from the target value of 55℃. After PID calculation, the PID calculation value is 45.0. Combined with Ks1=1.5 obtained in step S12, Opn1%=45.0%+1.5%=46.5%.

[0082] Step S14: Input the first-stage guide vane opening Opn1% and the surge correction amount Ks2 into the guide vane opening calculation formula to calculate the second-stage guide vane opening Opn2.

[0083] Specifically, the guide vane opening calculation formula is used: Opn2%=K1×Opn1%+K2+Ks2+Ke2. Where: K1 (second-stage guide vane opening following coefficient): calibrated to 0.9 (preset fixed value) based on the unit's rated operating conditions, ensuring coordinated matching between the second-stage guide vane opening and the first-stage guide vane opening; K2 (second-stage guide vane start-up opening): preset fixed value of 5.0%, ensuring the rationality of the initial opening of the second-stage guide vane when the unit starts up; Ke2 (second-stage guide vane efficiency correction): dynamically adjusted based on the unit's operating efficiency model, in this embodiment Ke2=0.5% under stable operating conditions. Combining Opn1%=46.5%, Ks1=1.5, and Ks2=2.2 from step S13, we calculate: Opn2%=0.9×46.5%+5.0%+2.2%+0.5%=41.85%+5.0%+2.2%+0.5%=49.55%.

[0084] Step S15: Obtain the first true pressure difference value corresponding to the first-level pressure difference ΔP2 and the second true pressure difference value corresponding to the second-level pressure difference ΔP4, and use the first-level pressure difference ΔP2, the first true pressure difference value, the second-level pressure difference ΔP4 and the second true pressure difference value as input quantities of the PI control algorithm, and output the guide vane opening correction quantity through the PI control algorithm.

[0085] The guide vane opening correction includes the first-stage guide vane opening correction and the second-stage guide vane opening correction.

[0086] Specifically, the first pressure difference ΔP2 is calculated between the first-level pressure difference and the first true pressure difference, and the second pressure difference ΔP4 is calculated between the second-level pressure difference and the second true pressure difference. It is then determined whether the first and second pressure difference values ​​fall within a preset error range. If neither the first nor the second pressure difference value falls within the preset error range, historical operating data of the heat pump unit is obtained, and abnormal pressure difference parameter groups with pressure difference values ​​exceeding the preset error range are identified. The abnormal pressure difference parameters and true pressure difference parameters in these abnormal pressure difference parameter groups are then grouped pairwise according to the heat pump unit's operating timeline to obtain sample parameter groups. The abnormal pressure difference parameters and true pressure difference parameters from multiple sample parameter groups are input into the PI control algorithm for calculation, yielding the proportional and integral coefficients of the PI control algorithm. Based on the calculated proportional and integral coefficients, combined with the abnormal and true pressure difference parameters, a pressure difference sequence table is generated. The primary pressure differential ΔP2 and the first true pressure differential value, and the secondary pressure differential ΔP4 and the second true pressure differential value are grouped pairwise according to the operation timeline to obtain the parameter groups to be optimized. Based on the pressure differential sequence list, the primary pressure differential ΔP2 and the secondary pressure differential ΔP4 in the parameter groups to be optimized are corrected and optimized to obtain the optimized primary pressure differential ΔP2 and the optimized secondary pressure differential ΔP4. Based on the optimized primary pressure differential ΔP2 and the optimized secondary pressure differential ΔP4, the primary guide vane opening Opn1% and the secondary guide vane opening Opn2% are updated and calculated to obtain the updated primary guide vane opening and the updated secondary guide vane opening. Correction calculations are performed based on the updated primary guide vane opening and the original primary guide vane opening to obtain the primary guide vane opening correction amount. Similarly, correction calculations are performed based on the updated secondary guide vane opening and the original secondary guide vane opening to obtain the secondary guide vane opening correction amount.

[0087] The original first-stage guide vane opening is Opn1% of the first-stage guide vane before optimization, and the original second-stage guide vane opening is Opn2 of the second-stage guide vane before optimization.

[0088] In this embodiment of the application, the abnormal pressure difference parameter refers to the first-level and second-level pressure differences generated by the heat pump unit within a historical time period. The abnormality means that the pressure difference between the first-level pressure difference and its corresponding real pressure difference exceeds the preset error value range, and the pressure difference between the second-level pressure difference and its corresponding real pressure difference exceeds the preset error value range.

[0089] Specifically, the differential pressure difference between the abnormal differential pressure parameter and the actual differential pressure parameter in each row of the differential pressure sequence table is calculated to obtain the first sample differential pressure value corresponding to the first-stage guide vane and the second sample differential pressure value corresponding to the second-stage guide vane. Based on the first differential pressure difference, the first sample differential pressure values ​​are compared and filtered to obtain the first parameter data group in the differential pressure sequence table whose differential pressure values ​​meet the preset difference deviation range. Based on the second differential pressure difference, the second sample differential pressure values ​​are compared and filtered to obtain the second parameter data group in the differential pressure sequence table whose differential pressure values ​​meet the preset difference deviation range. The proportional coefficient and integral coefficient in the first parameter data group and the second parameter data group are averaged respectively to obtain the average first proportional coefficient and average first integral coefficient corresponding to the first parameter data group, and the average second proportional coefficient and average second integral coefficient corresponding to the second parameter data group. The first actual differential pressure value, the average first integral coefficient, and the average first proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized first-stage differential pressure ΔP2. The second true differential pressure value, the average value of the second integral coefficient, and the average value of the second proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized second-level differential pressure ΔP4.

[0090] Step S16: Adjust the opening of the first-stage guide vane Opn1 according to the first-stage guide vane opening correction amount, and adjust the opening of the second-stage guide vane Opn2 according to the second-stage guide vane opening correction amount.

[0091] This application provides a dual-guide vane control method for a dual-shaft centrifugal heat pump unit. First, it defines complete pressure detection values ​​and key differential pressure parameters, clarifying the calculation logic for each level of throttling differential pressure and operating differential pressure, providing accurate data support for dual-guide vane adjustment. Then, through PID calculation of the first-stage guide vane and accumulation of surge correction, and calculation of the second-stage guide vane's dedicated opening formula, a hierarchical collaborative adjustment mechanism is constructed. The two stages of guide vanes respond to load and surge protection requirements respectively, and form a linkage through opening follow-up, enabling precise matching of guide vane opening adjustment to heating / cooling load changes, effectively adapting to complex operating condition fluctuations, and significantly improving the accuracy and flexibility of load adjustment. Surge trigger judgments are set for the first and second-stage throttling differential pressures, using the corresponding operating differential pressures (ΔP2, ΔP4) as the core parameters of the surge correction curve, and dynamically calculating the correction amounts Ks1 and Ks2 in conjunction with preset time intervals. This design precisely links surge correction to the actual operating state of the two-stage guide vanes, enabling real-time capture of abnormal pressure difference changes and early triggering of corrective actions. Compared to fixed threshold schemes, it offers more targeted protection against surge risks, significantly improving the unit's operational stability and reliability under low load and variable operating conditions. The theoretical and actual pressure difference values ​​are input into the PI control algorithm, which utilizes historical anomaly data modeling, parameter grouping optimization, and coefficient mean calculation to form a closed-loop correction mechanism for guide vane opening. This mechanism dynamically compensates for deviations between theoretical and actual pressure differences, balances the forces on the two-stage impellers, avoids single-stage overload or operational imbalance, and solves the efficiency loss problem caused by the lack of closed-loop correction in existing technologies. This allows the unit to achieve optimal operating efficiency and significantly reduces energy consumption.

[0092] In this embodiment of the application, the adjusted first-stage pressure difference ΔP2 and the adjusted second-stage pressure difference ΔP4 are obtained, and it is determined whether the adjusted second-stage pressure difference ΔP4 is equal to the adjusted first-stage pressure difference ΔP2. If they are not equal, the adjusted first-stage pressure difference ΔP2 and the adjusted second-stage pressure difference ΔP4 are used as input quantities for the PI control algorithm. The PI control algorithm outputs the guide vane opening correction amount of the second-stage impeller, and the pressure difference of the second-stage impeller is adjusted according to the guide vane opening correction amount so that the adjusted second-stage pressure difference ΔP4 is consistent with the adjusted first-stage pressure difference ΔP2.

[0093] In this application, the PI control algorithm calculates the adjusted first-stage pressure difference ΔP2 and the adjusted second-stage pressure difference ΔP4 in the same way as the calculation of the first pressure difference difference between the first-stage pressure difference ΔP2 and the first true pressure difference value, and the second pressure difference difference between the second-stage pressure difference ΔP4 and the second true pressure difference value, as described above, and will not be repeated here.

[0094] The following describes a dual-guide-vane control system for a dual-shaft centrifugal heat pump unit provided in an embodiment of this application. The dual-guide-vane control system for a dual-shaft centrifugal heat pump unit described below can be referred to in conjunction with the dual-guide-vane control method for a dual-shaft centrifugal heat pump unit described above. Figure 2 , Figure 2 This is a schematic diagram of the structure of a dual-guide vane control system 20 for a dual-shaft centrifugal heat pump unit provided in an embodiment of this application, including:

[0095] Standard definition module 21 is used to define the pressure detection value of the heat pump unit and the outlet water temperature data when heating or cooling. The pressure detection value includes the inlet pressure Pe of the first stage guide vane, the pressure P1 of the first stage impeller, the first stage compression exhaust pressure P2, the pressure P3 of the second stage impeller, and the second stage compression exhaust pressure Pc.

[0096] The differential pressure determination module 22 is used to determine key differential pressure parameters based on pressure detection values. The key differential pressure parameters include primary throttling differential pressure ΔP1, primary differential pressure ΔP2, secondary throttling differential pressure ΔP3, and secondary differential pressure ΔP4. Primary throttling differential pressure ΔP1 = inlet pressure Pe of primary guide vane - pressure P1 of primary impeller; primary differential pressure ΔP2 = primary compression exhaust pressure P2 - pressure P1 of primary impeller; secondary throttling differential pressure ΔP3 = primary compression exhaust pressure P2 - pressure P3 of secondary impeller; secondary differential pressure ΔP4 = secondary compression exhaust pressure Pc - pressure P3 of secondary impeller.

[0097] The correction calculation module 23 is used to calculate and analyze the surge correction amount of the guide vane for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3 and the second-stage pressure difference ΔP4 respectively, and obtain the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane.

[0098] The first opening calculation module 24 is used to calculate the PID calculation value of the first-stage guide vane based on the outlet water temperature data, and to accumulate the PID calculation value with the surge correction amount Ks1 to obtain the first-stage guide vane opening Opn1%;

[0099] The second opening calculation module 25 is used to input the first-stage guide vane opening Opn1% and the surge correction amount Ks2 into the guide vane opening calculation formula for calculation to obtain the second-stage guide vane opening Opn2%;

[0100] The real pressure difference acquisition module 26 is used to acquire the first real pressure difference value corresponding to the first-level pressure difference ΔP2 and the second real pressure difference value corresponding to the second-level pressure difference ΔP4, and use the first-level pressure difference ΔP2, the first real pressure difference value, the second-level pressure difference ΔP4 and the second real pressure difference value as input quantities of the PI control algorithm, and output the guide vane opening correction quantity through the PI control algorithm. The guide vane opening correction quantity includes the first-level guide vane opening correction quantity and the second-level guide vane opening correction quantity.

[0101] The opening adjustment module 27 is used to adjust the opening of the first-stage guide vane Opn1% according to the first-stage guide vane opening correction amount, and to adjust the opening of the second-stage guide vane Opn2 according to the second-stage guide vane opening correction amount.

[0102] In one possible implementation of this application embodiment, when the correction calculation module 23 calculates and analyzes the guide vane surge correction amount for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4 respectively, and obtains the surge correction amount Ks1 for the first-stage guide vane and the surge correction amount Ks2 for the second-stage guide vane, it is specifically used for:

[0103] Determine whether the first-stage throttling pressure difference ΔP1 is greater than the first preset reference value. If it is, use the first-stage pressure difference ΔP2 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the first-stage guide vane according to the preset surge correction curve at preset time intervals to obtain the surge correction of the first-stage guide vane Ks1.

[0104] Determine whether the secondary throttling pressure difference ΔP3 is greater than the first preset reference value. If it is, use the secondary pressure difference ΔP4 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the secondary guide vane according to the preset surge correction curve at preset time intervals to obtain the surge correction of the secondary guide vane Ks2.

[0105] Another possible implementation in this application embodiment is that the preset surge correction curve is a two-dimensional coordinate system curve, where the X-axis of the two-dimensional coordinate system is the pressure difference parameter, and the Y-axis is the surge correction Ks. The X-axis includes three key nodes: X1, X2, and X3. X2 is the reference pressure difference determined based on the operating condition calculation value of the heat pump unit, X1 is the safety critical pressure difference, calculated by the formula X1 = X2 - operating condition deviation, and X3 is the surge critical pressure difference, calculated by the formula X3 = X2 + surge margin. The Y-axis is set with a key parameter Y1, which is the maximum value of the surge correction, calculated from the operating condition of the heat pump unit.

[0106] The preset surge correction curve is generated by a two-point fitting algorithm. The fitting reference points are (X1,0) and (X3,Y1). That is, when the pressure difference parameter is X1, the surge correction Ks is 0, and when the pressure difference parameter is X3, the surge correction Ks = Y1.

[0107] Another possible implementation in this application embodiment is that the guide vane opening calculation formula is Opn2%=K1×Opn1%+K2+Ks2+Ke2, where K1 is the opening following coefficient of the second-stage guide vane, K2 is the start-up opening of the second-stage guide vane, and Ke2 is the efficiency correction amount of the second-stage guide vane; the opening following coefficient K1 and the start-up opening K2 of the second-stage guide vane are preset fixed values ​​based on the rated operating parameters of the heat pump unit.

[0108] In another possible implementation of this application embodiment, when the real pressure difference acquisition module 26 uses the first-stage pressure difference ΔP2, the first real pressure difference value, the second-stage pressure difference ΔP4, and the second real pressure difference value as inputs to the PI control algorithm, and outputs the guide vane opening correction amount through the PI control algorithm, it is specifically used for:

[0109] Calculate the first pressure difference between the first-level pressure difference ΔP2 and the first true pressure difference value, and the second pressure difference between the second-level pressure difference ΔP4 and the second true pressure difference value, and determine whether the first pressure difference value and the second pressure difference value meet the preset error value range.

[0110] If neither the first differential pressure value nor the second differential pressure value falls within the preset error range, then the historical operating data of the heat pump unit is obtained, and it is determined that there are abnormal differential pressure parameter groups in the historical operating data whose differential pressure values ​​exceed the preset error range.

[0111] The abnormal pressure difference parameter and the actual pressure difference parameter in the abnormal pressure difference parameter group are grouped in pairs according to the operating timeline of the heat pump unit to obtain the sample parameter group;

[0112] The abnormal pressure difference parameters and the true pressure difference parameters from multiple sample parameter groups are respectively input into the PI control algorithm for calculation to obtain the proportional coefficient and integral coefficient of the PI control algorithm.

[0113] Based on the calculated proportional coefficient and integral coefficient, combined with the abnormal pressure difference parameters and the actual pressure difference parameters, a pressure difference sequence table is generated;

[0114] The first-level pressure difference ΔP2 and the first actual pressure difference value, and the second-level pressure difference ΔP4 and the second actual pressure difference value are respectively grouped in pairs according to the operation timeline to obtain the parameter group to be optimized;

[0115] Based on the differential pressure sequence table, the first-level differential pressure ΔP2 and the second-level differential pressure ΔP4 in the parameter group to be optimized are corrected and optimized to obtain the optimized first-level differential pressure ΔP2 and optimized second-level differential pressure ΔP4.

[0116] Based on the optimized first-stage pressure difference ΔP2 and the optimized second-stage pressure difference ΔP4, the first-stage guide vane opening Opn1% and the second-stage guide vane opening Opn2% are updated and calculated to obtain the updated first-stage guide vane opening and the updated second-stage guide vane opening.

[0117] The correction amount for the first-stage guide vane opening is obtained by performing a correction calculation based on the updated first-stage guide vane opening and the original first-stage guide vane opening. The correction amount for the second-stage guide vane opening is obtained by performing a correction calculation based on the updated second-stage guide vane opening and the original second-stage guide vane opening.

[0118] In another possible implementation of this application embodiment, when the real pressure difference acquisition module 26 corrects and optimizes the first-level pressure difference ΔP2 and the second-level pressure difference ΔP4 in the parameter group to be optimized according to the pressure difference sequence table, and obtains the optimized first-level pressure difference ΔP2 and the optimized second-level pressure difference ΔP4, it is specifically used for:

[0119] For each row of parameter data in the differential pressure sequence table, the differential pressure difference between the abnormal differential pressure parameter and the actual differential pressure parameter is calculated to obtain the first sample differential pressure value corresponding to the first-stage guide vane and the second sample differential pressure value corresponding to the second-stage guide vane.

[0120] Based on the first differential pressure value, the first sample differential pressure value is compared and filtered to obtain the first parameter data group in the differential pressure sequence table whose differential pressure value meets the preset difference deviation range.

[0121] Based on the second pressure difference value, the second sample pressure difference value is compared and filtered to obtain the second parameter data group in the pressure difference sequence table whose pressure difference value meets the preset difference deviation range;

[0122] The mean values ​​of the proportional coefficient and integral coefficient in the first parameter data group and the second parameter data group are calculated respectively to obtain the mean value of the first proportional coefficient and the mean value of the first integral coefficient corresponding to the first parameter data group, and the mean value of the second proportional coefficient and the mean value of the second integral coefficient corresponding to the second parameter data group.

[0123] The first true differential pressure value, the average value of the first integral coefficient, and the average value of the first proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized first-level differential pressure ΔP2.

[0124] The second true differential pressure value, the average value of the second integral coefficient, and the average value of the second proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized second-level differential pressure ΔP4.

[0125] This application provides an electronic device, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 3 The illustrated electronic device 300 includes a processor 301 and a memory 303. The processor 301 and the memory 303 are connected, for example, via a bus 302. Optionally, the electronic device 300 may also include a transceiver 304. It should be noted that in practical applications, the transceiver 304 is not limited to one type, and the structure of this electronic device 300 does not constitute a limitation on the embodiments of this application.

[0126] Processor 301 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in connection with the embodiments of this application. Processor 301 may also be a combination that implements computing functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0127] Bus 302 may include a pathway for transmitting information between the aforementioned components. Bus 302 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 302 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0128] The memory 303 may be a ROM (Read Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0129] The memory 303 is used to store application code that executes the scheme of the embodiments of this application, and its execution is controlled by the processor 301. The processor 301 is used to execute the application code stored in the memory 303 to implement the content shown in the foregoing method embodiments.

[0130] Among them, electronic devices include, but are not limited to: mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), and in-vehicle terminals (such as in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 3 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0131] The following describes a computer-readable storage medium provided by an embodiment of this application. The computer-readable storage medium described below can be referred to in correspondence with the method described above.

[0132] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the steps of the dual-guide vane control system for a dual-shaft centrifugal heat pump unit as described above.

[0133] Since the embodiments of the computer-readable storage medium portion correspond to the embodiments of the method portion, please refer to the description of the embodiments of the method portion for the embodiments of the computer-readable storage medium portion.

[0134] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0135] The above are only some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for controlling the dual guide vanes of a dual-shaft centrifugal heat pump unit, characterized in that, include: Define the pressure detection value of the heat pump unit and the outlet water temperature data when heating or cooling. The pressure detection value includes the inlet pressure Pe of the first stage guide vane, the pressure P1 of the first stage impeller, the first stage compression exhaust pressure P2, the pressure P3 of the second stage impeller, and the second stage compression exhaust pressure Pc. Based on the pressure detection values, key differential pressure parameters are determined. These key differential pressure parameters include first-stage throttling differential pressure ΔP1, first-stage differential pressure ΔP2, second-stage throttling differential pressure ΔP3, and second-stage differential pressure ΔP4. The first-stage throttling differential pressure ΔP1 = inlet pressure Pe of the first-stage guide vane - pressure P1 of the first-stage impeller. The first-stage differential pressure ΔP2 = first-stage compression exhaust pressure P2 - pressure P1 of the first-stage impeller. The second-stage throttling differential pressure ΔP3 = first-stage compression exhaust pressure P2 - pressure P3 of the second-stage impeller. The second-stage differential pressure ΔP4 = second-stage compression exhaust pressure Pc - pressure P3 of the second-stage impeller. The surge correction amount of the guide vane is calculated and analyzed for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3 and the second-stage pressure difference ΔP4 respectively, and the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane are obtained. The PID calculation value of the first-stage guide vane is calculated based on the outlet water temperature data, and the PID calculation value is accumulated with the surge correction amount Ks1 to obtain the first-stage guide vane opening Opn1%; The first-stage guide vane opening Opn1% and the surge correction amount Ks2 are input into the guide vane opening calculation formula to obtain the second-stage guide vane opening Opn2%. The guide vane opening calculation formula is Opn2%=K1×Opn1%+K2+Ks2+Ke2, where K1 is the opening following coefficient of the second-stage guide vane, K2 is the start-up opening of the second-stage guide vane, and Ke2 is the efficiency correction amount of the second-stage guide vane. The opening following coefficient K1 and the start-up opening K2 of the second-stage guide vane are preset fixed values ​​based on the rated operating parameters of the heat pump unit. Obtain the first true pressure difference value corresponding to the first-stage pressure difference ΔP2 and the second true pressure difference value corresponding to the second-stage pressure difference ΔP4, and use the first-stage pressure difference ΔP2, the first true pressure difference value, the second-stage pressure difference ΔP4 and the second true pressure difference value as input quantities of the PI control algorithm. Output the guide vane opening correction quantity through the PI control algorithm. The guide vane opening correction quantity includes the first-stage guide vane opening correction quantity and the second-stage guide vane opening correction quantity. The first-stage guide vane opening Opn1 is adjusted according to the first-stage guide vane opening correction amount, and the second-stage guide vane opening Opn2 is adjusted according to the second-stage guide vane opening correction amount.

2. The method for controlling the dual guide vanes of a dual-shaft centrifugal heat pump unit according to claim 1, characterized in that, The step involves calculating and analyzing the surge correction amounts for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4, respectively, to obtain the surge correction amount Ks1 for the first-stage guide vane and the surge correction amount Ks2 for the second-stage guide vane, including: Determine whether the first-stage throttling pressure difference ΔP1 is greater than the first preset reference value. If it is greater, then use the first-stage pressure difference ΔP2 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the first-stage guide vane according to the preset surge correction curve at preset time intervals to obtain the surge correction of the first-stage guide vane Ks1. Determine whether the secondary throttling pressure difference ΔP3 is greater than the first preset reference value. If it is, use the secondary pressure difference ΔP4 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the secondary guide vane according to the preset time interval based on the preset surge correction curve to obtain the surge correction of the secondary guide vane Ks2.

3. The method for controlling the dual guide vanes of a dual-shaft centrifugal heat pump unit according to claim 2, characterized in that, The preset surge correction curve is a two-dimensional coordinate system curve, where the X-axis represents the pressure difference parameter and the Y-axis represents the surge correction Ks. The X-axis includes three key nodes: X1, X2, and X3. X2 is the reference pressure difference determined based on the operating condition calculation value of the heat pump unit; X1 is the safety critical pressure difference, calculated using the formula X1 = X2 - operating condition deviation; and X3 is the surge critical pressure difference, calculated using the formula X3 = X2 + surge margin. The Y-axis is set with a key parameter Y1, which is the maximum surge correction value, calculated from the operating condition of the heat pump unit. The preset surge correction curve is generated by a two-point fitting algorithm. The fitting reference points are (X1,0) and (X3,Y1). That is, when the pressure difference parameter is X1, the surge correction Ks is 0, and when the pressure difference parameter is X3, the surge correction Ks = Y1.

4. The method for controlling the dual guide vanes of a dual-shaft centrifugal heat pump unit according to claim 1, characterized in that, The step of using the first-stage pressure difference ΔP2, the first true pressure difference value, the second-stage pressure difference ΔP4, and the second true pressure difference value as inputs to the PI control algorithm, and outputting the guide vane opening correction value through the PI control algorithm, includes: Calculate the first pressure difference between the first-level pressure difference ΔP2 and the first true pressure difference value, and the second pressure difference between the second-level pressure difference ΔP4 and the second true pressure difference value, and determine whether the first pressure difference value and the second pressure difference value meet the preset error value range. If neither the first differential pressure value nor the second differential pressure value falls within the preset error value range, then the historical operating data of the heat pump unit is obtained, and it is determined that there is an abnormal differential pressure parameter group in the historical operating data whose differential pressure value exceeds the preset error value range. The abnormal pressure difference parameter and the actual pressure difference parameter in the abnormal pressure difference parameter group are respectively grouped into two groups according to the operating timeline of the heat pump unit to obtain the sample parameter group; The abnormal pressure difference parameters and the true pressure difference parameters from the multiple sample parameter groups are respectively input into the PI control algorithm for calculation to obtain the proportional coefficient and integral coefficient of the PI control algorithm. Based on the calculated proportional coefficient and integral coefficient, combined with the abnormal pressure difference parameter and the actual pressure difference parameter, a pressure difference sequence table is generated; The first-level pressure difference ΔP2 and the first actual pressure difference value, and the second-level pressure difference ΔP4 and the second actual pressure difference value are respectively grouped in pairs according to the operation timeline to obtain the parameter group to be optimized; The first-level pressure difference ΔP2 and the second-level pressure difference ΔP4 in the parameter group to be optimized are corrected and optimized according to the pressure difference sequence table to obtain the optimized first-level pressure difference ΔP2 and the optimized second-level pressure difference ΔP4. Based on the optimized first-stage pressure difference ΔP2 and the optimized second-stage pressure difference ΔP4, the first-stage guide vane opening Opn1% and the second-stage guide vane opening Opn2% are updated and calculated to obtain the updated first-stage guide vane opening and the updated second-stage guide vane opening. The correction amount for the first-stage guide vane opening is obtained by performing a correction calculation based on the updated first-stage guide vane opening and the original first-stage guide vane opening. The correction amount for the second-stage guide vane opening is obtained by performing a correction calculation based on the updated second-stage guide vane opening and the original second-stage guide vane opening.

5. The method for controlling the dual guide vanes of a dual-shaft centrifugal heat pump unit according to claim 4, characterized in that, The step of correcting and optimizing the primary pressure difference ΔP2 and the secondary pressure difference ΔP4 in the parameter group to be optimized according to the pressure difference sequence table to obtain the optimized primary pressure difference ΔP2 and the optimized secondary pressure difference ΔP4 includes: The pressure difference is calculated between the abnormal pressure difference parameter and the true pressure difference parameter in each row of the pressure difference sequence table to obtain the first sample pressure difference value corresponding to the first-stage guide vane and the second sample pressure difference value corresponding to the second-stage guide vane. Based on the first pressure difference value, the first sample pressure difference value is compared and filtered to obtain the first parameter data group in the pressure difference sequence table whose pressure difference value meets the preset difference deviation range; Based on the second pressure difference value, the second sample pressure difference value is compared and filtered to obtain the second parameter data group in the pressure difference sequence table whose pressure difference value meets the preset difference deviation range; The average values ​​of the proportional coefficients and integral coefficients in the first parameter data group and the second parameter data group are calculated respectively to obtain the average value of the first proportional coefficient and the average value of the first integral coefficient corresponding to the first parameter data group, and the average value of the second proportional coefficient and the average value of the second integral coefficient corresponding to the second parameter data group. The first true differential pressure value, the average value of the first integral coefficient, and the average value of the first proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized first-level differential pressure ΔP2. The second true differential pressure value, the average value of the second integral coefficient, and the average value of the second proportional coefficient are input into the PI control algorithm for calculation to obtain the optimized secondary differential pressure ΔP4.

6. A dual-guide-vane control system for a dual-shaft centrifugal heat pump unit, characterized in that, include: The standard definition module is used to define the pressure detection values ​​of the heat pump unit and the outlet water temperature data when heating or cooling. The pressure detection values ​​include the inlet pressure Pe of the first-stage guide vane, the pressure P1 of the first-stage impeller, the first-stage compression exhaust pressure P2, the pressure P3 of the second-stage impeller, and the second-stage compression exhaust pressure Pc. The differential pressure determination module is used to determine key differential pressure parameters based on the pressure detection value. The key differential pressure parameters include primary throttling differential pressure ΔP1, primary differential pressure ΔP2, secondary throttling differential pressure ΔP3, and secondary differential pressure ΔP4. The primary throttling differential pressure ΔP1 = inlet pressure Pe of the primary guide vane - pressure P1 of the primary impeller; the primary differential pressure ΔP2 = primary compression exhaust pressure P2 - pressure P1 of the primary impeller; the secondary throttling differential pressure ΔP3 = primary compression exhaust pressure P2 - pressure P3 of the secondary impeller; the secondary differential pressure ΔP4 = secondary compression exhaust pressure Pc - pressure P3 of the secondary impeller. The correction calculation module is used to calculate and analyze the guide vane surge correction amount for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4, respectively, to obtain the surge correction amount Ks1 of the first-stage guide vane and the surge correction amount Ks2 of the second-stage guide vane. The first opening calculation module is used to calculate the PID calculation value of the first-stage guide vane based on the outlet water temperature data, and to accumulate the PID calculation value with the surge correction amount Ks1 to obtain the first-stage guide vane opening Opn1%; The second opening calculation module is used to input the first-stage guide vane opening Opn1% and the surge correction amount Ks2 into the guide vane opening calculation formula for calculation to obtain the second-stage guide vane opening Opn2%. The guide vane opening calculation formula is Opn2%=K1×Opn1%+K2+Ks2+Ke2, where K1 is the opening following coefficient of the second-stage guide vane, K2 is the start-up opening of the second-stage guide vane, and Ke2 is the efficiency correction amount of the second-stage guide vane. The opening following coefficient K1 and the start-up opening K2 of the second-stage guide vane are preset fixed values ​​based on the rated operating parameters of the heat pump unit. The real pressure difference acquisition module is used to acquire the first real pressure difference value corresponding to the first-level pressure difference ΔP2 and the second real pressure difference value corresponding to the second-level pressure difference ΔP4, and use the first-level pressure difference ΔP2, the first real pressure difference value, the second-level pressure difference ΔP4 and the second real pressure difference value as input quantities of the PI control algorithm, and output the guide vane opening correction quantity through the PI control algorithm. The guide vane opening correction quantity includes the first-level guide vane opening correction quantity and the second-level guide vane opening correction quantity. The opening adjustment module is used to adjust the opening of the first-stage guide vane Opn1% according to the first-stage guide vane opening correction amount, and to adjust the opening of the second-stage guide vane Opn2 according to the second-stage guide vane opening correction amount.

7. A dual-guide-vane control system for a dual-shaft centrifugal heat pump unit according to claim 6, characterized in that, The correction calculation module, when calculating and analyzing the guide vane surge correction amount for the first-stage throttling pressure difference ΔP1, the first-stage pressure difference ΔP2, the second-stage throttling pressure difference ΔP3, and the second-stage pressure difference ΔP4 respectively, and obtaining the surge correction amount Ks1 for the first-stage guide vane and the surge correction amount Ks2 for the second-stage guide vane, is specifically used for: Determine whether the first-stage throttling pressure difference ΔP1 is greater than the first preset reference value. If it is greater, then use the first-stage pressure difference ΔP2 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the first-stage guide vane according to the preset surge correction curve at preset time intervals to obtain the surge correction of the first-stage guide vane Ks1. Determine whether the secondary throttling pressure difference ΔP3 is greater than the first preset reference value. If it is, use the secondary pressure difference ΔP4 in the key pressure difference parameters as the lateral parameter of the preset surge correction curve, and calculate the surge correction of the secondary guide vane according to the preset time interval based on the preset surge correction curve to obtain the surge correction of the secondary guide vane Ks2.

8. An electronic device, characterized in that, The electronic device includes: At least one processor; Memory; At least one application, wherein the at least one application is stored in a memory and configured to be executed by at least one processor, the at least one application being configured to: perform a dual-guide vane control method for a dual-shaft centrifugal heat pump unit as described in any one of claims 1-5.

9. A computer-readable storage medium, characterized in that, include: The computer program is stored and can be loaded by a processor and executed as described in any one of claims 1-5, which is a dual-guide vane control method for a dual-shaft centrifugal heat pump unit.

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