A heat pump and rectification integrated coordinated control method and system

Abstract

This invention relates to the field of heat pump integration technology, and discloses a method and system for integrated coordinated control of heat pump and distillation. The method includes: synchronously acquiring the internal state parameters and thermodynamic regulation parameters of the integrated heat pump; performing characteristic interpolation on the suction pressure and condensing pressure to obtain the evaporation saturation temperature and condensation saturation temperature; constructing an operating space with the compressor frequency as the horizontal axis and the electronic expansion valve opening as the vertical axis; connecting the operating points exceeding the evaporation saturation temperature and the condensation saturation temperature to obtain the liquid slugging risk zone and the exhaust overheating zone; using the liquid slugging risk zone and the exhaust overheating zone as constraints to obtain a stable region, and taking the operating point with the highest heat pump efficiency ratio as the coordinated operating point; and modulating the drive signal based on the control variables and cooling load adjustment amount corresponding to the coordinated operating point to obtain a coordinated control signal. This invention can improve the efficiency of integrated coordinated control of heat pump and distillation.

Description

Technical Field

[0001] This invention relates to the field of heat pump integration technology, and in particular to a coordinated control method and system for integrating heat pump and distillation. Background Technology

[0002] In the operation of integrated heat pump and distillation systems, traditional control methods often employ single-parameter adjustment modes, independently controlling only the compressor frequency or the electronic expansion valve opening, without fully considering the synergistic relationship between the two. This control approach makes it difficult to find the optimal combination of system operating parameters and to adapt in real time to the dynamic changes in the heat pump's internal state parameters and thermodynamic regulation parameters. This results in the heat pump's energy efficiency ratio remaining at a low level, making it difficult to maximize energy conversion efficiency. Furthermore, traditional methods lack a deep understanding of the refrigerant's thermodynamic properties, failing to accurately capture the changing patterns of evaporation and condensation saturation temperatures, further limiting the improvement of control precision.

[0003] Existing technologies lack a scientifically sound risk identification and avoidance mechanism, failing to effectively define the operational boundaries of liquid slugging risk and exhaust overheating risk. This leads to potential safety hazards in complex operating conditions, affecting the stable operation and lifespan of the equipment. Furthermore, traditional control methods do not adaptively adjust to dynamic changes in the cooling load, and the control signals lack a flexible spectrum correction mechanism. When load fluctuations occur, they cannot quickly respond and optimize control strategies, resulting in decreased system efficiency and increased energy consumption. This makes it difficult to meet the actual requirements of integrated heat pump and distillation systems for efficient, stable, and safe operation. Summary of the Invention

[0004] This invention provides a method and system for integrated coordinated control of heat pump and distillation, the main purpose of which is to solve the problem of low efficiency in integrated coordinated control of heat pump and distillation.

[0005] To achieve the above objectives, the present invention provides an integrated coordinated control method for heat pumps and distillation, comprising:

[0006] Simultaneously acquire the internal state parameters and thermodynamic regulation parameters of the integrated heat pump;

[0007] The evaporation saturation temperature and condensation saturation temperature of the integrated heat pump are obtained by performing characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters respectively.

[0008] A two-dimensional coordinate system is constructed for the integrated heat pump, with the compressor frequency in the thermodynamic regulation parameters as the horizontal axis and the electronic expansion valve opening in the thermodynamic regulation parameters as the vertical axis.

[0009] By connecting the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature respectively, the liquid slugging risk restricted area and the exhaust overheating restricted area of ​​the integrated heat pump can be obtained;

[0010] Using the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints, the two-dimensional coordinate system is divided to obtain the stable region of the integrated heat pump, and the operating point with the highest heat pump energy efficiency ratio in the stable region is taken as the cooperative operation point of the integrated heat pump, wherein the stable region is the area with the highest matching degree between the compressor frequency and the electronic expansion valve opening.

[0011] Based on the control variables and cooling load adjustment amount corresponding to the cooperative operation point, the AC motor drive signal and valve position control compensation signal of the integrated heat pump are modulated to obtain the cooperative control signal of the integrated heat pump.

[0012] In a preferred embodiment, the simultaneous acquisition of the integrated heat pump's internal state parameters and thermodynamic regulation parameters includes:

[0013] The monitoring data of the integrated heat pump is periodically sampled to obtain the equipment status value and driving variables of the integrated heat pump;

[0014] The device status values ​​and the driving variables are time-aligned to obtain the internal status parameters and thermodynamic regulation parameters of the integrated heat pump.

[0015] In a preferred embodiment, the step of performing characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters to obtain the evaporation saturation temperature and condensation saturation temperature of the integrated heat pump includes:

[0016] Based on the physical properties of the refrigerant in the integrated heat pump, piecewise linear interpolation is performed on the suction pressure and the condensation pressure to obtain the saturation temperature curve of the integrated heat pump.

[0017] The temperature points corresponding to the suction pressure and the condensation pressure are extracted from the saturation temperature curve to obtain the evaporation saturation temperature and the condensation saturation temperature of the integrated heat pump.

[0018] In a preferred embodiment, constructing a two-dimensional coordinate system for the integrated heat pump, with the compressor frequency (among the thermodynamic regulation parameters) as the horizontal axis and the electronic expansion valve opening (among the thermodynamic regulation parameters) as the vertical axis, includes:

[0019] The range of compressor frequency values ​​in the thermodynamic regulation parameters is used as the horizontal axis coordinate range of the integrated heat pump.

[0020] The range of values ​​for the opening degree of the electronic expansion valve in the thermodynamic regulation parameters is taken as the vertical axis coordinate interval of the integrated heat pump.

[0021] The integrated heat pump is constructed using the horizontal axis coordinate interval and the vertical axis coordinate interval.

[0022] In a preferred embodiment, the step of connecting the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature to obtain the liquid slugging risk zone and the exhaust overheat zone of the integrated heat pump includes:

[0023] Set a lower safety limit corresponding to the evaporation saturation temperature and a higher safety limit corresponding to the condensation saturation temperature;

[0024] In the two-dimensional coordinate system, liquid hammer risk points below the lower safety limit and exhaust overheat risk points above the upper safety limit are identified;

[0025] The liquid slugging risk points and the exhaust overheating risk points are connected by transforming trajectories to form an envelope, thus obtaining the liquid slugging risk exclusion zone and the exhaust overheating exclusion zone of the integrated heat pump.

[0026] In a preferred embodiment, setting the lower safety limit corresponding to the evaporation saturation temperature and the upper safety limit corresponding to the condensation saturation temperature includes:

[0027] Based on the thermodynamic properties of the refrigerant in the integrated heat pump, the evaporation saturation temperature and the condensation saturation temperature are thermodynamically converted to obtain the saturation evaporation pressure and saturation condensation pressure of the integrated heat pump.

[0028] Based on the minimum suction pressure and maximum discharge pressure of the integrated heat pump, the saturated evaporation pressure and the condensation pressure are limited to obtain the safe lower limit of the evaporation pressure and the safe upper limit of the condensation pressure of the integrated heat pump.

[0029] In a preferred embodiment, the two-dimensional coordinate system is divided using the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints to obtain the stable region of the integrated heat pump. The operating point with the highest heat pump efficiency ratio within the stable region is taken as the cooperative operation point of the integrated heat pump. The stable region is the area where the compressor frequency and the electronic expansion valve opening degree have the highest matching degree, including:

[0030] Based on the evaporation saturation temperature and the condensation saturation temperature, the upper boundary curve of the liquid slugging risk zone and the lower boundary curve of the exhaust overheating zone are plotted in the two-dimensional coordinate system to obtain the non-restricted area of ​​the integrated heat pump.

[0031] The region in the non-restricted area where the compressor frequency and the electronic expansion valve opening degree match the most is defined as the stable region of the integrated heat pump;

[0032] The heat pump efficiency ratio is calculated by iterating through the operating points in the stable region.

[0033] By performing local optimization on the operating point where the energy efficiency ratio of the heat pump is maximized, the cooperative operating point of the integrated heat pump is obtained.

[0034] In a preferred embodiment, the formula for calculating the heat pump energy efficiency ratio is as follows:

[0035]

[0036] in, The heat pump's energy efficiency ratio is... To map the heating capacity, For Euler number, To coordinate the control of entropy, This is the compressor's reference power consumption. The frequency deviation penalty coefficient, This is the actual compressor frequency. This is the theoretically optimal frequency.

[0037] In a preferred embodiment, the step of modulating the AC motor drive signal and valve position control current signal of the integrated heat pump based on the control variable and cooling load adjustment amount corresponding to the cooperative operation point to obtain the cooperative control signal of the integrated heat pump includes:

[0038] The compressor frequency and electronic expansion valve opening corresponding to the cooperative operation point are converted from digital to analog to obtain the AC motor drive signal and valve position control current signal of the integrated heat pump.

[0039] The AC motor drive signal and the valve position control current signal are superimposed and modulated to obtain the control signal of the integrated heat pump;

[0040] The control signal is spectrally corrected based on the cooling load adjustment to obtain the coordinated control signal of the integrated heat pump.

[0041] To address the above problems, the present invention also provides an integrated coordinated control system for heat pumps and distillation, the system comprising:

[0042] The data acquisition module synchronously acquires the internal state parameters and thermodynamic regulation parameters of the integrated heat pump;

[0043] The saturation temperature module performs characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters to obtain the evaporation saturation temperature and condensation saturation temperature of the integrated heat pump.

[0044] The coordinate system construction module constructs a two-dimensional coordinate system for the integrated heat pump, with the compressor frequency in the thermal regulation parameters as the horizontal axis and the electronic expansion valve opening in the thermal regulation parameters as the vertical axis.

[0045] The restricted area identification module connects the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature, respectively, to obtain the liquid slugging risk restricted area and the exhaust overheating restricted area of ​​the integrated heat pump;

[0046] The collaborative operation point module uses the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints to divide the two-dimensional coordinate system, obtain the stable region of the integrated heat pump, and take the operating point with the highest heat pump energy efficiency ratio in the stable region as the collaborative operation point of the integrated heat pump. The stable region is the area where the compressor frequency and the electronic expansion valve opening degree have the highest matching degree.

[0047] The collaborative control signal module modulates the AC motor drive signal and valve position control current of the integrated heat pump based on the control variables and cooling load adjustment amount corresponding to the collaborative operation point, thereby obtaining the collaborative control signal of the integrated heat pump.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] 1. This technology simultaneously acquires the internal state parameters and thermodynamic regulation parameters of the integrated heat pump, and performs precise analysis based on the physical properties and thermodynamic characteristics of the refrigerant. It constructs a two-dimensional coordinate system and scientifically delineates the liquid slugging risk zone and the exhaust overheating zone, effectively ensuring the safety of system operation. By selecting the stable zone with the highest matching degree between compressor frequency and electronic expansion valve opening, and combining a comprehensive traversal and local optimization of the heat pump's energy efficiency ratio, the optimal cooperative operating point is determined, significantly improving the heat pump's energy conversion efficiency and achieving the goal of high-efficiency system operation.

[0050] 2. This technology generates a coordinated control signal adapted to actual operating requirements through a series of precise control steps, including digital-to-analog conversion, signal superposition modulation, and spectrum correction, ensuring consistent and coordinated operation between the compressor and the electronic expansion valve. This control signal can dynamically respond to changes in the refrigeration load, enabling real-time optimization and adjustment of parameters, significantly improving the stability and flexibility of system operation. Simultaneously, through scientific control logic, it reduces energy loss, extends equipment lifespan, and fully leverages the operational potential of the integrated heat pump and distillation system. Attached Figure Description

[0051] Figure 1 A schematic flowchart of an integrated coordinated control method for heat pump and distillation provided in an embodiment of the present invention;

[0052] Figure 2A functional block diagram of an integrated coordinated control system for heat pump and distillation provided in an embodiment of the present invention;

[0053] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0054] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0055] This application provides a method for integrated coordinated control of heat pumps and distillation. The executing entity of this method includes, but is not limited to, at least one of the following electronic devices that can be configured to execute the method provided in this application: a server, a terminal, etc. In other words, the method can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster. The server can be an independent server or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDNs), and big data and artificial intelligence platforms.

[0056] Reference Figure 1 The diagram shown is a schematic flow chart of a heat pump and distillation integrated coordinated control method according to an embodiment of the present invention. In this embodiment, the heat pump and distillation integrated coordinated control method includes:

[0057] In this embodiment of the invention, the simultaneous acquisition of the internal state parameters and thermodynamic regulation parameters of the integrated heat pump is specifically used for:

[0058] The monitoring data of the integrated heat pump is periodically sampled to obtain the equipment status value and driving variables of the integrated heat pump;

[0059] The device status values ​​and the driving variables are time-aligned to obtain the internal status parameters and thermodynamic regulation parameters of the integrated heat pump.

[0060] Specifically, based on the operating characteristics and monitoring requirements of the integrated heat pump, a fixed sampling period is determined. This period needs to cover a complete operating cycle of the heat pump and accurately capture parameter changes. During the sampling process, the heat pump's built-in sensors and data acquisition devices are activated to continuously collect various real-time data during the operation of the heat pump.

[0061] Specifically, based on the time axis, all device status values ​​and driving variables are sorted according to the sampling time. For data with time deviations, a one-to-one correspondence between device status values ​​and driving variables is established based on a preset standard time interval.

[0062] Furthermore, the equipment status values ​​include physical quantities such as suction pressure and condensing pressure that reflect the internal operating status of the heat pump, while the driving variables include operational quantities such as compressor frequency and electronic expansion valve opening that control the operation of the heat pump. During the acquisition process, it is ensured that the corresponding equipment status values ​​and driving variables can be acquired synchronously at each sampling moment, and all data are accompanied by accurate sampling timestamps, thereby obtaining the equipment status values ​​and driving variables of the integrated heat pump.

[0063] Furthermore, if only one of the device status value or driving variable data is collected at a certain sampling time, the single data at that time is discarded. After such time alignment processing, the aligned device status value is defined as the internal status parameter of the integrated heat pump, and the aligned driving variable is defined as the thermodynamic regulation parameter of the integrated heat pump.

[0064] In summary, periodic sampling captures the equipment status values ​​and driving variables of the integrated heat pump at fixed intervals, enabling comprehensive and continuous recording of heat pump operating data and avoiding control decision biases caused by data gaps. The sampling process simultaneously acquires equipment status values ​​such as suction pressure and condensing pressure, as well as driving variables such as compressor frequency and electronic expansion valve opening. This provides complete and accurate basic data for subsequent analysis of heat pump operating characteristics and identification of risk zones, ensuring reliable data support for subsequent coordinated control and guaranteeing the accuracy and feasibility of the control method.

[0065] In summary, time alignment processing synchronizes and matches device status values ​​from different sources and at different acquisition times with driving variables, eliminating data deviations in the time dimension. This ensures that each set of data accurately corresponds to the state and control variables of the heat pump at the same operating moment. The resulting internal state parameters and thermodynamic regulation parameters are completely synchronized in time, providing a precise matching parameter basis for subsequent steps such as characteristic interpolation and coordinate system construction. This ensures the accuracy of subsequent steps such as risk exclusion zone delineation and collaborative operation point determination, thereby improving the reliability and effectiveness of the entire integrated coordinated control method.

[0066] In this embodiment of the invention, when performing characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters to obtain the evaporation saturation temperature and condensation saturation temperature of the integrated heat pump, it is specifically used for:

[0067] Based on the physical properties of the refrigerant in the integrated heat pump, piecewise linear interpolation is performed on the suction pressure and the condensation pressure to obtain the saturation temperature curve of the integrated heat pump.

[0068] The temperature points corresponding to the suction pressure and the condensation pressure are extracted from the saturation temperature curve to obtain the evaporation saturation temperature and the condensation saturation temperature of the integrated heat pump.

[0069] Specifically, the specific type of refrigerant used in the integrated heat pump is identified, and the relationship between the refrigerant's pressure and saturation temperature in different pressure ranges is obtained through the refrigerant's physical properties. Based on the actual range of suction pressure and condensing pressure, the entire pressure range is divided into several continuous and non-overlapping pressure segments.

[0070] Specifically, on the obtained saturation temperature curve, first locate the horizontal coordinate position that corresponds exactly to the previously obtained suction pressure value. This horizontal coordinate position intersects the saturation temperature curve vertically upwards, and the vertical coordinate value corresponding to the intersection point is the saturation temperature point corresponding to the suction pressure. This temperature point is determined as the evaporation saturation temperature of the integrated heat pump.

[0071] Furthermore, for each pressure segment, the pressure values ​​at the two endpoints and their corresponding saturation temperatures within that segment are selected as interpolation nodes. For each pressure segment containing the suction pressure, a linear relationship is constructed within that pressure segment by connecting the two endpoints to form a straight line, based on the pressure at the two endpoints and the corresponding saturation temperature. The same method is applied to each pressure segment containing the condensing pressure. After constructing the linear relationship for all pressure segments, the linear segments of all pressure segments are connected sequentially according to pressure order to form a continuous curve that completely covers the range of suction and condensing pressure values. This curve is the saturation temperature curve of the integrated heat pump.

[0072] Furthermore, using the same method, the horizontal coordinate position corresponding to the condensing pressure value is found on the saturation temperature curve. The intersection of this position vertically upward with the saturation temperature curve is the saturation temperature point corresponding to the condensing pressure. This temperature point is defined as the condensing saturation temperature of the integrated heat pump.

[0073] In summary, piecewise linear interpolation based on the physical properties of the refrigerant can accurately fit the correspondence between suction pressure, condensing pressure, and saturation temperature, avoiding the biases caused by a single fitting method. By dividing the pressure range into reasonable segments and constructing a linear relationship, the resulting saturation temperature curve fully covers the pressure range of heat pump operation, truly reflecting the saturation temperature change pattern of the refrigerant under different pressures. This provides a temperature benchmark that fits the actual operating conditions for subsequent risk exclusion zone identification and collaborative operation point selection, ensuring the accuracy of subsequent control links.

[0074] In summary, by extracting the corresponding temperature points from the saturation temperature curve, the suction pressure and condensation pressure can be directly converted into concrete evaporation saturation temperature and condensation saturation temperature. This process accurately matches the correspondence between pressure and temperature, and the resulting temperature parameters can intuitively reflect the critical temperature boundaries of heat pump operation. This provides a core basis for setting safety thresholds for liquid slugging risk and exhaust overheating, ensuring that subsequent restricted area delineation and stable zone selection have clear temperature reference standards, thus helping to improve the safety and efficiency of heat pump operation.

[0075] In this embodiment of the invention, the construction of a two-dimensional coordinate system for the integrated heat pump, with the compressor frequency (among the thermodynamic regulation parameters) as the horizontal axis and the electronic expansion valve opening (among the thermodynamic regulation parameters) as the vertical axis, is specifically used for:

[0076] The range of compressor frequency values ​​in the thermodynamic regulation parameters is used as the horizontal axis coordinate range of the integrated heat pump.

[0077] The range of values ​​for the opening degree of the electronic expansion valve in the thermodynamic regulation parameters is taken as the vertical axis coordinate interval of the integrated heat pump.

[0078] The integrated heat pump is constructed using the horizontal axis coordinate interval and the vertical axis coordinate interval.

[0079] Specifically, the actual operating range of the compressor frequency in the thermodynamic regulation parameters of the integrated heat pump should be determined. This range needs to be determined in combination with the heat pump's design rated parameters, safe operating thresholds, and operating data under actual operating conditions. The minimum and maximum allowable operating frequencies of the compressor should be obtained, and the actual operating frequency data of the compressor under different load conditions should be collected.

[0080] Specifically, the characteristics of the electronic expansion valve opening in the thermodynamic regulation parameters of an integrated heat pump are analyzed. The value of the electronic expansion valve opening is usually presented as a percentage. Combining the design standards of the heat pump and the technical parameters of the electronic expansion valve, the minimum opening and maximum opening are determined. The minimum opening is the lowest degree of opening that the electronic expansion valve can operate stably, and the maximum opening is the degree to which the valve is fully open.

[0081] Specifically, a Cartesian coordinate system is constructed using the previously determined horizontal and vertical coordinate intervals as the core. The origin of the coordinate system is set as the intersection of the minimum value of the compressor frequency and the minimum value of the electronic expansion valve opening, ensuring that the position of the origin can accurately correspond to the state when both parameters are at their minimum values.

[0082] Furthermore, the determined compressor frequency range is directly used as the horizontal axis coordinate interval of the integrated heat pump two-dimensional coordinate system. The scale of the horizontal axis is arranged in ascending order from left to right according to the value of the frequency. The value corresponding to each scale accurately reflects the actual operating frequency of the compressor. The name of the horizontal axis is clearly marked as "compressor frequency".

[0083] Furthermore, the value range of the opening degree of the electronic expansion valve is set as the vertical axis coordinate interval of the integrated heat pump two-dimensional coordinate system. The scale of the vertical axis is arranged in ascending order from bottom to top according to the opening percentage. The percentage value corresponding to each scale accurately corresponds to the actual opening state of the electronic expansion valve. The name of the vertical axis is clearly marked as "electronic expansion valve opening degree".

[0084] Furthermore, the horizontal axis extends horizontally, its length determined by the range of compressor frequency values, extending from the scale corresponding to the minimum frequency value to the scale corresponding to the maximum frequency value. The vertical axis extends vertically, its length determined by the range of electronic expansion valve opening values, extending from the scale corresponding to the minimum opening value to the scale corresponding to the maximum opening value. In this way, the horizontal and vertical axis coordinate ranges are organically combined to form a two-dimensional coordinate system for the integrated heat pump's operating status.

[0085] In summary, using the compressor frequency range as the horizontal axis coordinate interval precisely anchors the variation boundary of the core control variable of the heat pump. This interval completely covers the frequency range of normal compressor operation, ensuring that all actual operating frequency values ​​can be found at corresponding positions on the horizontal axis. This setting makes the changes in compressor frequency intuitively presented in the coordinate system, providing clear horizontal dimensional support for subsequent matching analysis with the electronic expansion valve opening, visualizing the synergistic relationship between the two, and laying the foundation for risk point identification and stable zone division.

[0086] In summary, using the electronic expansion valve opening range as the vertical axis coordinate interval clarifies the variation range of another key heat pump regulation parameter. This interval aligns with the mechanical adjustment limits of the electronic expansion valve and actual operational requirements, ensuring that all effective opening values ​​can be accurately mapped on the vertical axis. This setting complements the compressor frequency on the horizontal axis, fully presenting the two-dimensional variation space of the heat pump's core regulation parameter. This allows each operating state to correspond to a unique node in the coordinate system, providing a clear vertical dimensional basis for subsequent delineation of risk-prone and stable regions.

[0087] In summary, by constructing a two-dimensional coordinate system using the horizontal and vertical axis coordinate ranges, the combined relationship between compressor frequency and electronic expansion valve opening is transformed into a visualized spatial distribution, allowing all possible operating states of the heat pump to be intuitively presented in the form of coordinate points. This coordinate system provides a unified analytical framework for the subsequent identification of liquid slugging risk zones and exhaust overheating zones, and also creates an intuitive analytical environment for the division of stable zones and the determination of coordinated operation points, making complex operating parameter relationships clear and identifiable, and significantly improving the intuitiveness and accuracy of control decisions.

[0088] In this embodiment of the invention, when connecting the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature to obtain the liquid slugging risk zone and the exhaust overheating zone of the integrated heat pump, it is specifically used for:

[0089] Set a lower safety limit corresponding to the evaporation saturation temperature and a higher safety limit corresponding to the condensation saturation temperature;

[0090] In the two-dimensional coordinate system, liquid hammer risk points below the lower safety limit and exhaust overheat risk points above the upper safety limit are identified;

[0091] The liquid slugging risk points and the exhaust overheating risk points are connected by transforming trajectories to form an envelope, thus obtaining the liquid slugging risk exclusion zone and the exhaust overheating exclusion zone of the integrated heat pump.

[0092] Specifically, referring to the design specifications of integrated heat pumps, the thermodynamic characteristics of refrigerants, and long-term operational safety data, the safety boundary requirements corresponding to the evaporation saturation temperature are clearly defined. This safety lower limit must ensure that the heat pump will not experience liquid refrigerant entering the compressor and causing liquid slugging due to excessively low evaporation temperatures during operation. By reviewing the safe operation records of the heat pump under different loads and environmental conditions, and combining the physical state changes of the refrigerant in the low-temperature range, a fixed temperature value is determined as the safety lower limit of the evaporation saturation temperature. This value must be lower than the evaporation saturation temperature during normal operation, but higher than the critical temperature that may cause liquid slugging risk, ensuring sufficient safety margin.

[0093] Specifically, in the constructed two-dimensional coordinate system, the evaporation temperature data and condensation temperature data corresponding to all operating points in the coordinate system are extracted one by one. These operating points are all composed of a specific combination of compressor frequency and electronic expansion valve opening. Each operating point corresponds to a unique evaporation temperature and condensation temperature.

[0094] Specifically, all identified liquid impact risk points are sorted in ascending order of their horizontal coordinates. If there are liquid impact risk points with the same horizontal coordinate, they are arranged in descending order of their vertical coordinates to ensure that the sorted liquid impact risk points can show a continuous change trajectory.

[0095] Furthermore, regarding the safety upper limit corresponding to the condensing saturation temperature, its safety boundary is also determined based on the heat pump's design rated parameters, the condenser's heat dissipation capacity, and the refrigerant's stability data in the high-temperature range. This safety upper limit must prevent the compressor's exhaust temperature from exceeding the limit due to excessively high condensing temperatures, which could lead to equipment overheating and damage. By analyzing the heat pump's operating data under full-load and high-temperature environmental conditions, combined with the refrigerant's thermal stability limit, a fixed temperature value is determined as the safety upper limit of the condensing saturation temperature. This value is higher than the condensing saturation temperature during normal operation but lower than the critical temperature that may cause exhaust overheating failure, ensuring that the heat pump can still avoid safety risks under extreme operating conditions. Finally, the safety lower limit corresponding to the evaporation saturation temperature and the safety upper limit corresponding to the condensing saturation temperature are set.

[0096] Furthermore, the evaporation temperature of each operating point is compared one by one with the set lower limit of the evaporation saturation temperature. If the evaporation temperature of a certain operating point is lower than the lower limit, the operating point is identified as a liquid slugging risk point, and the horizontal and vertical coordinates of the operating point in the two-dimensional coordinate system are recorded in detail. At the same time, the condensation temperature of each operating point is compared one by one with the set upper limit of the condensation saturation temperature. If the condensation temperature of a certain operating point is higher than the upper limit, the operating point is identified as an exhaust overheat risk point, and the coordinates of the operating point are also recorded.

[0097] Furthermore, based on the sorted liquid slugging risk points, a continuous line segment connection method is used. Starting from the first liquid slugging risk point, adjacent liquid slugging risk points are connected sequentially with straight lines until the last liquid slugging risk point is reached, forming a closed envelope. The area enclosed by this envelope is the liquid slugging risk exclusion zone of the integrated heat pump. For all exhaust overheating risk points, the same sorting method is used, arranging them in ascending order of horizontal coordinate, and descending order of vertical coordinate when horizontal coordinates are the same. Then, adjacent exhaust overheating risk points are connected sequentially with continuous line segments, forming another closed envelope. The area enclosed by this envelope is the exhaust overheating exclusion zone of the integrated heat pump.

[0098] In summary, setting a safe lower limit for the evaporation saturation temperature and a safe upper limit for the condensation saturation temperature clearly defines the safe temperature boundaries for heat pump operation. These boundaries are determined based on the thermodynamic properties of the refrigerant and the safe operating thresholds of the heat pump. This avoids liquid slugging caused by excessively low evaporation temperatures and prevents equipment damage due to excessively high condensation temperatures and exhaust overheating. This setting provides a clear standard for subsequent risk identification, delineating the safe operating temperature range from the source, laying a solid foundation for stable heat pump operation, and ensuring equipment safety.

[0099] In summary, the system accurately identifies liquid slugging and exhaust overheating risk points in a two-dimensional coordinate system. By comparing the temperature data of each operating point with the safety boundary, it directly pinpoints operating states with potential safety hazards. This process, relying on a visualized coordinate system, enables rapid location and precise screening of risk points, thoroughly eliminating dangerous operating combinations that could lead to equipment failure. It provides accurate risk point data support for subsequent restricted area delineation, reducing the possibility of missed safety hazards.

[0100] In summary, connecting risk points along their transformation trajectories to form an envelope creates a risk exclusion zone, clearly defining the dangerous operating areas that the heat pump must avoid. This makes the risk ranges of liquid slugging and exhaust overheating visible and clear. This division allows the heat pump to quickly avoid exclusion zones during operation, adjusting operating parameters only within safe areas. It eliminates dangerous options for determining the subsequent stable zone and provides clear exclusion zone constraints for control signal modulation, ensuring the heat pump operates efficiently under safe conditions.

[0101] In this embodiment of the invention, setting the lower safety limit corresponding to the evaporation saturation temperature and the upper safety limit corresponding to the condensation saturation temperature is specifically used for:

[0102] Based on the thermodynamic properties of the refrigerant in the integrated heat pump, the evaporation saturation temperature and the condensation saturation temperature are thermodynamically converted to obtain the saturation evaporation pressure and saturation condensation pressure of the integrated heat pump.

[0103] Based on the minimum suction pressure and maximum discharge pressure of the integrated heat pump, the saturated evaporation pressure and the condensation pressure are limited to obtain the safe lower limit of the evaporation pressure and the safe upper limit of the condensation pressure of the integrated heat pump.

[0104] Specifically, by extracting thermodynamic property data from the refrigerant's handbook, the manufacturer's technical parameter table, and industry standards, the pressure variation pattern of the refrigerant at different temperatures is obtained. For a determined evaporation saturation temperature, the temperature record that perfectly matches the obtained refrigerant thermodynamic data is precisely searched. The corresponding pressure value is the result of thermodynamic conversion of the evaporation saturation temperature, and this pressure value is defined as the saturation evaporation pressure of the integrated heat pump.

[0105] Specifically, by consulting the integrated heat pump's equipment design manual, the compressor's technical specifications, and the heat pump's overall safety operation manual, the minimum allowable suction pressure and maximum discharge pressure of the heat pump under normal operating conditions can be determined. These two pressure values ​​are key boundary parameters to ensure the safe operation of the heat pump. The minimum suction pressure can prevent the compressor from running dry or being damaged due to excessively low suction pressure, while the maximum discharge pressure can prevent system overpressure failure due to excessively high discharge pressure.

[0106] Furthermore, for the determined condensation saturation temperature, the same search method is used to locate the temperature entry that matches the condensation saturation temperature in the refrigerant thermodynamic data. The corresponding pressure value is the result of the condensation saturation temperature after thermodynamic conversion, and this pressure value is determined as the saturation condensation pressure of the integrated heat pump.

[0107] Furthermore, the previously obtained saturated evaporation pressure is compared with the determined minimum suction pressure. If the saturated evaporation pressure is higher than or equal to the minimum suction pressure, it is directly used as the safe lower limit of the evaporation pressure. If the saturated evaporation pressure is lower than the minimum suction pressure, it is used as the safe lower limit of the evaporation pressure, ensuring that the safe lower limit of the evaporation pressure is not lower than the minimum allowable suction pressure standard of the heat pump. Simultaneously, the obtained saturated condensation pressure is compared with the determined maximum discharge pressure. If the saturated condensation pressure is lower than or equal to the maximum discharge pressure, it is directly used as the safe upper limit of the condensation pressure. If the saturated condensation pressure is higher than the maximum discharge pressure, it is used as the safe upper limit of the condensation pressure, ensuring that the safe upper limit of the condensation pressure does not exceed the maximum allowable discharge pressure standard of the heat pump.

[0108] In summary, by performing thermodynamic conversion between the evaporation saturation temperature and the condensation saturation temperature based on the refrigerant's thermodynamic properties, the temperature parameters are transformed into corresponding saturated evaporation pressure and saturated condensation pressure, achieving a precise correspondence between temperature and pressure. This conversion process strictly adheres to the refrigerant's inherent physical properties, and the resulting pressure parameters objectively reflect the pressure state of the heat pump operation. This provides core data based on the refrigerant's intrinsic characteristics for subsequent safety boundary setting, avoiding the limitations of relying solely on temperature parameters to determine the safety state and improving the scientific rigor of safety boundary setting.

[0109] In summary, by using the minimum suction pressure and maximum discharge pressure of the integrated heat pump as constraints, the saturated evaporation pressure and condensation pressure are limited, thus clarifying the pressure safety limits for heat pump operation. This limiting process combines the structural design and safe operating thresholds of the heat pump equipment itself, ensuring that the obtained lower safe limit of evaporation pressure and upper safe limit of condensation pressure not only conform to the thermodynamic characteristics of the refrigerant but also adapt to the actual operating capacity of the equipment. This effectively avoids the risk of equipment damage due to excessive pressure and provides a reliable pressure basis for setting subsequent temperature safety boundaries, further strengthening the safety defenses for heat pump operation.

[0110] In this embodiment of the invention, the two-dimensional coordinate system is divided using the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints to obtain the stable region of the integrated heat pump. The operating point with the highest heat pump efficiency ratio within the stable region is taken as the cooperative operation point of the integrated heat pump. Specifically, when the stable region is the area with the highest matching degree between the compressor frequency and the electronic expansion valve opening, it is used for:

[0111] Based on the evaporation saturation temperature and the condensation saturation temperature, the upper boundary curve of the liquid slugging risk zone and the lower boundary curve of the exhaust overheating zone are plotted in the two-dimensional coordinate system to obtain the non-restricted area of ​​the integrated heat pump.

[0112] The region in the non-restricted area where the compressor frequency and the electronic expansion valve opening degree match the most is defined as the stable region of the integrated heat pump;

[0113] The heat pump efficiency ratio is calculated by iterating through the operating points in the stable region.

[0114] By performing local optimization on the operating point where the energy efficiency ratio of the heat pump is maximized, the cooperative operating point of the integrated heat pump is obtained.

[0115] Specifically, based on the determined evaporation saturation temperature, all operating points that are exactly equal to that temperature are found in a two-dimensional coordinate system. These operating points are the critical positions between the liquid slugging risk restricted area and the non-restricted area. These critical operating points are connected in order of increasing compressor frequency to form a continuous and smooth curve. This curve is the upper boundary curve of the liquid slugging risk restricted area. The area above the curve is the liquid slugging risk restricted area, and the area below the curve is the safe area without liquid slugging risk.

[0116] Specifically, for all operating points in the non-restricted area, the compatibility relationship between the compressor frequency and the electronic expansion valve opening at each operating point is analyzed one by one. The basis for judging the compatibility relationship is the relevant data on the operating stability and energy conversion efficiency of the heat pump under this combination.

[0117] Specifically, a comprehensive investigation of all operating points within the stable zone was conducted, and heat pump operating data corresponding to each operating point was extracted one by one. This data included key information related to energy efficiency, such as the heat output of the heat pump, the power consumption of the compressor, and the heat loss of the system.

[0118] Specifically, in the obtained heat pump energy efficiency ratio data, the operating point corresponding to the highest energy efficiency ratio is selected and used as the initial starting point for local optimization. Centered on the initial starting point, a small adjacent region is defined within the stable region. The range of this region is limited to not exceeding the boundary of the stable region and can cover all adjacent operating points around the initial starting point.

[0119] Furthermore, based on the determined condensation saturation temperature, all operating points exactly equal to this temperature are selected in the two-dimensional coordinate system. These operating points are the critical positions between the exhaust overheating restricted area and the non-restricted area. Similarly, these critical operating points are continuously connected in ascending order of compressor frequency to form another continuous and smooth curve. This curve is the lower boundary curve of the exhaust overheating restricted area. The area below this curve is the exhaust overheating restricted area, and the area above the curve is the safe area with no exhaust overheating risk. The upper boundary curve of the liquid slugging risk restricted area and the lower boundary curve of the exhaust overheating restricted area together define a region in the two-dimensional coordinate system with no liquid slugging risk and no exhaust overheating risk. This region is the non-restricted area of ​​the integrated heat pump.

[0120] Furthermore, for each operating point, the degree of matching between the optimal opening range of the electronic expansion valve at that compressor frequency and the optimal frequency range of the compressor at that electronic expansion valve opening is determined. A high degree of matching means that the heat pump can achieve low energy loss and stable operation at that operating point. The degree of matching of all operating points in the non-restricted area is comprehensively evaluated, and continuous areas with a high degree of matching that meets the preset standard and is concentrated are selected.

[0121] Furthermore, based on the core definition of heat pump energy efficiency ratio (EER) and combined with the extracted operational data, the specific EER value for each operating point is obtained by calculating the ratio of heating capacity to total energy consumption. After obtaining the EER for each operating point, all EER values ​​are organized and recorded in ascending order, and associated with the corresponding operating point coordinate information.

[0122] Furthermore, the heat pump efficiency ratio (EER) of each operating point within the adjacent region is calculated and compared with the EER of the initial starting point. If an operating point with a higher EER exists within the adjacent region, that operating point is updated as the new optimization starting point. Subsequently, adjacent regions are delineated again with the new starting point as the center for EER comparison. This process is repeated until no operating point with an EER higher than the current starting point appears within the delineated adjacent regions. At this point, the operating point corresponding to the current starting point is the operating point with the highest heat pump EER obtained after local optimization, and this operating point is determined as the cooperative operation point of the integrated heat pump.

[0123] In summary, by plotting the risk-free zone boundary curves using evaporation saturation temperature and condensation saturation temperature, a clear non-risk zone was delineated. This zone avoids the risks of liquid slugging and exhaust overheating, while also encompassing all safe operating parameter combinations. This delineation clarifies the parameter range for safe heat pump operation, providing a precise baseline for subsequent stable zone selection, eliminating interference from dangerous operating conditions, and ensuring that subsequent optimization processes are always conducted within a safe framework, thus improving the safety and specificity of the control method.

[0124] In summary, the region with the highest matching degree between compressor frequency and electronic expansion valve opening was selected from the non-restricted area as the stable region, focusing on the high-efficiency potential range of heat pump operation. The parameter combination within this region can achieve a balance between equipment operation stability and energy conversion efficiency, avoiding the inefficiency of blindly searching for the optimal solution in a large safe area, significantly narrowing the scope of subsequent energy efficiency ratio traversal and optimization, and improving the efficiency and accuracy of determining the coordinated operation point.

[0125] In summary, by traversing the heat pump energy efficiency ratios of all operating points within the stable region, a comprehensive understanding of the energy efficiency level distribution under different parameter combinations within this region was achieved. By systematically analyzing the energy efficiency performance of each operating point, complete energy efficiency data support was provided for subsequent optimization, avoiding insufficient optimization due to the omission of high-efficiency operating points. This ensured the accurate identification of operating points with the greatest energy efficiency potential, laying a comprehensive data foundation for determining collaborative operating points.

[0126] In summary, by performing local optimization at the operating point where the heat pump achieves its highest energy efficiency ratio, the precision of the optimal operating parameters is further refined. This eliminates interference from neighboring points with slightly lower energy efficiency, ensuring that the final coordinated operating point represents the most precise parameter combination within the stable region. This operating point guides the heat pump to operate in its optimal state, maximizing energy conversion efficiency while ensuring operational stability. This allows the heat pump to achieve highly efficient and energy-saving operation under safe conditions, highlighting the core advantages of the integrated coordinated control method.

[0127] In this embodiment of the invention, the formula for calculating the heat pump energy efficiency ratio is specifically used for:

[0128]

[0129] in, The heat pump's energy efficiency ratio is... To map the heating capacity, For Euler number, To coordinate the control of entropy, This is the compressor's reference power consumption. The frequency deviation penalty coefficient, This is the actual compressor frequency. This is the theoretically optimal frequency.

[0130] Specifically, the mapped heating capacity is derived from the actual heating data collected in real time by heat sensing devices during the operation of the integrated heat pump. This data is obtained after linear mapping processing corresponding to the heat pump's operating state, directly reflecting the heat pump's current heating output capacity. The Euler number is a fixed constant in mathematics, a natural constant determined through long-term mathematical derivation and verification, and is directly used as a known constant in calculations. The cooperative control entropy is obtained by analyzing the cooperative operating state of the compressor frequency and electronic expansion valve opening in the integrated heat pump. Combined with data such as the degree of matching and operational stability, it is determined after a quantitative evaluation of the system's disorder level, reflecting the energy loss characteristics related to the cooperative control process. The compressor reference power consumption is the standard operating power consumption of the compressor obtained through experimental testing under the integrated heat pump's design rated operating conditions. This data is calibrated multiple times before the heat pump leaves the factory and stored in the system control database as the basic reference power consumption for calculations. The frequency deviation penalty coefficient is a fixed value pre-set based on the heat pump's operating characteristics and energy efficiency optimization goals. It is determined experimentally, taking into account the energy efficiency loss patterns of the compressor under different frequency deviations, and is used to quantify the energy efficiency impact of the deviation between the actual and optimal frequencies. The actual compressor frequency is the operating frequency data collected in real time by a frequency monitoring device installed on the compressor, directly reflecting the compressor's current actual operating state. The theoretical optimal frequency is the optimal operating frequency determined after a comprehensive analysis of the compressor's operating efficiency, based on the integrated heat pump's design parameters, refrigerant thermodynamic properties, and energy efficiency test data under different operating conditions. It is stored in the system as a reference benchmark for frequency optimization.

[0131] Furthermore, this calculation is used to accurately quantify the energy efficiency level of the integrated heat pump under current operating conditions. By comprehensively considering factors such as the heat pump's heating output, collaborative control effects, compressor base power consumption, and the impact of frequency deviation, a specific index that comprehensively reflects the heat pump's energy conversion efficiency is obtained. Its core significance lies in providing a quantitative basis for optimizing the operation of integrated heat pumps. The magnitude of this value determines the energy efficiency of the current combination of compressor frequency and electronic expansion valve opening, helping to screen out stable operating ranges and determine collaborative operating points. This ensures that the heat pump achieves its heating function with the highest energy conversion efficiency during operation, while also providing energy efficiency decision support for subsequent control signal modulation, achieving high-efficiency and energy-saving operation of the heat pump.

[0132] In general, as the mapped heating capacity increases, the overall calculation result also increases, meaning that the improvement in heat pump heating output capacity directly leads to an increase in the energy efficiency ratio (EER), showing a positive correlation. When the cooperative control entropy increases, its corresponding exponential term value decreases, resulting in a lower overall calculation result. This indicates that the higher the degree of disorder in the cooperative control process, the greater the energy loss and the lower the EER, showing an inverse correlation. When the compressor's baseline power consumption increases, the calculation result decreases, meaning that the higher the compressor's base operating power consumption, the lower the EER, showing an inverse correlation. The closer the actual compressor frequency is to the theoretical optimal frequency, the smaller the absolute value of the frequency deviation, the smaller the corresponding penalty term value, and the larger the overall calculation result. When the actual compressor frequency is exactly the same as the theoretical optimal frequency, the penalty term value is zero, at which point the negative impact of this part on the calculation result is completely eliminated, and the EER reaches a relatively high level under this operating condition. Conversely, the farther the actual compressor frequency deviates from the theoretical optimal frequency, the larger the penalty term value, and the more significant the decrease in EER, showing an inverse correlation between the degree of deviation between the actual frequency and the theoretical optimal frequency and the EER.

[0133] In this embodiment of the invention, when the AC motor drive signal and valve position control current signal of the integrated heat pump are modulated based on the control variable and cooling load adjustment amount corresponding to the cooperative operation point to obtain the cooperative control signal of the integrated heat pump, it is specifically used for:

[0134] The compressor frequency and electronic expansion valve opening corresponding to the cooperative operation point are converted from digital to analog to obtain the AC motor drive signal and valve position control current signal of the integrated heat pump.

[0135] The AC motor drive signal and the valve position control current signal are superimposed and modulated to obtain the control signal of the integrated heat pump;

[0136] The control signal is spectrally corrected based on the cooling load adjustment to obtain the coordinated control signal of the integrated heat pump.

[0137] Specifically, the compressor frequency and electronic expansion valve opening values ​​corresponding to the coordinated operation point are extracted. For the digital signal of the compressor frequency, the digital frequency value is converted into a continuously changing voltage signal with a fixed conversion accuracy. The amplitude change of this voltage signal is linearly related to the numerical change of the compressor frequency, which can accurately reflect the compressor operating frequency required by the coordinated operation point. This voltage signal is the AC motor drive signal of the integrated heat pump, which can be directly transmitted to the AC motor controller of the compressor to adjust the motor's operating frequency.

[0138] Specifically, the amplitude ranges of the two signals are first uniformly calibrated to ensure that they are superimposed at the same signal magnitude, thus avoiding signal distortion after modulation due to excessive differences in signal amplitude. After calibration, the voltage waveform of the AC motor drive signal and the current waveform of the valve position control current signal are synchronously superimposed using a phase-in-phase superposition method.

[0139] Specifically, the cooling load adjustment of the integrated heat pump under the current operating conditions is obtained. This adjustment reflects the difference between the actual cooling demand and the rated cooling load. The frequency components of the control signal are fully analyzed to clarify the fundamental frequency, harmonic components, and amplitude ratio of each frequency component.

[0140] Furthermore, for the digital signal of the opening degree of the electronic expansion valve, the digital value of the opening degree is converted into a current signal within a specific range according to the preset conversion rules. The magnitude of the current signal is precisely matched with the opening degree requirement of the electronic expansion valve. The larger the current, the larger the valve opening degree, and the smaller the current, the smaller the valve opening degree.

[0141] Furthermore, when the AC motor drive signal increases, the valve position control current signal also increases synchronously, and vice versa, ensuring that the superimposed signal can simultaneously and accurately transmit the control requirements of the compressor frequency and the electronic expansion valve opening. After superposition, the superimposed composite signal is converted into a regular signal that conforms to the heat pump control interface standard through signal shaping processing. This signal, after superposition modulation and shaping, is the control signal of the integrated heat pump.

[0142] Furthermore, based on the magnitude and direction of the cooling load adjustment, the target for spectrum correction is determined. If the cooling load needs to be increased, the amplitude of the frequency components in the control signal related to the load increase needs to be enhanced; if the cooling load needs to be reduced, the amplitude of the corresponding frequency components needs to be weakened. Based on the determined correction target, the spectrum of the control signal is adjusted accordingly. By enhancing or weakening the amplitude of specific frequency components, the spectral characteristics of the control signal are made compatible with the current cooling load adjustment. During the adjustment process, it is ensured that the core control information of the control signal is not changed, and only its spectral distribution is optimized to adapt to the load change requirements.

[0143] In summary, the parameters corresponding to the coordinated operation points are converted from digital to analog, transforming abstract frequency and opening values ​​into analog signals that can directly drive the actuators—namely, AC motor drive signals and valve position control current signals. This conversion ensures the effective transmission of control commands, enabling the compressor and electronic expansion valve to accurately respond to the requirements of the coordinated operation points. It avoids the problem of digital signals not being able to directly act on the actuators, providing a reliable signal foundation for their coordinated operation and guaranteeing the precise implementation of control commands.

[0144] In summary, by superimposing and modulating the two signals, the dual commands of compressor frequency regulation and electronic expansion valve opening control are integrated to form a unified integrated heat pump control signal. This process achieves synchronous coordination of the two control signals, avoiding the incoordination problems that may result from independent control of a single signal. It ensures that compressor frequency changes and electronic expansion valve opening adjustments are synchronized and adapted, improving the coordination and stability of heat pump operation and laying the signal foundation for subsequent precise control.

[0145] In summary, spectral correction of the control signal based on cooling load adjustments enables the control signal to dynamically adapt to changes in actual cooling demand. The corrected coordinated control signal retains the optimal control logic at the coordinated operation point while also optimizing in real time according to load changes. This avoids the drawbacks of fixed control signals being unable to adapt to load fluctuations, ensuring that the heat pump maintains efficient and stable operation under different load conditions, and further enhancing the flexibility and adaptability of integrated coordinated control.

[0146] Compared with the prior art, the present invention has the following beneficial effects:

[0147] 1. This technology simultaneously acquires the internal state parameters and thermodynamic regulation parameters of the integrated heat pump, and performs precise analysis based on the physical properties and thermodynamic characteristics of the refrigerant. It constructs a two-dimensional coordinate system and scientifically delineates the liquid slugging risk zone and the exhaust overheating zone, effectively ensuring the safety of system operation. By selecting the stable zone with the highest matching degree between compressor frequency and electronic expansion valve opening, and combining a comprehensive traversal and local optimization of the heat pump's energy efficiency ratio, the optimal cooperative operating point is determined, significantly improving the heat pump's energy conversion efficiency and achieving the goal of high-efficiency system operation.

[0148] 2. This technology generates a coordinated control signal adapted to actual operating requirements through a series of precise control steps, including digital-to-analog conversion, signal superposition modulation, and spectrum correction, ensuring consistent and coordinated operation between the compressor and the electronic expansion valve. This control signal can dynamically respond to changes in the refrigeration load, enabling real-time optimization and adjustment of parameters, significantly improving the stability and flexibility of system operation. Simultaneously, through scientific control logic, it reduces energy loss, extends equipment lifespan, and fully leverages the operational potential of the integrated heat pump and distillation system.

[0149] like Figure 2 The diagram shown is a functional block diagram of an integrated coordinated control system for heat pump and distillation provided in an embodiment of the present invention.

[0150] The integrated coordinated control system 100 for heat pumps and distillation described in this invention can be installed in an electronic device. Depending on the functions implemented, the integrated coordinated control system 100 may include a data acquisition module 101, a saturation temperature module 102, a coordinate system construction module 103, a restricted area identification module 104, a cooperative operation point module 105, and a cooperative control signal module 106. The module described in this invention can also be referred to as a unit, which refers to a series of computer program segments that can be executed by the processor of an electronic device and can perform a fixed function, and are stored in the memory of the electronic device.

[0151] In this embodiment, the functions of each module / unit are as follows:

[0152] The data acquisition module synchronously acquires the internal state parameters and thermodynamic regulation parameters of the integrated heat pump;

[0153] The saturation temperature module performs characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters to obtain the evaporation saturation temperature and condensation saturation temperature of the integrated heat pump.

[0154] The coordinate system construction module constructs a two-dimensional coordinate system for the integrated heat pump, with the compressor frequency in the thermal regulation parameters as the horizontal axis and the electronic expansion valve opening in the thermal regulation parameters as the vertical axis.

[0155] The restricted area identification module connects the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature, respectively, to obtain the liquid slugging risk restricted area and the exhaust overheating restricted area of ​​the integrated heat pump;

[0156] The collaborative operation point module uses the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints to divide the two-dimensional coordinate system, obtain the stable region of the integrated heat pump, and take the operating point with the highest heat pump energy efficiency ratio in the stable region as the collaborative operation point of the integrated heat pump. The stable region is the area where the compressor frequency and the electronic expansion valve opening degree have the highest matching degree.

[0157] The collaborative control signal module modulates the AC motor drive signal and valve position control current signal of the integrated heat pump based on the control variables and cooling load adjustment amount corresponding to the collaborative operation point, thereby obtaining the collaborative control signal of the integrated heat pump.

[0158] In the several embodiments provided by this invention, it should be understood that the disclosed methods and systems can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and other division methods may be used in actual implementation.

[0159] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0160] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional modules.

[0161] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0162] The embodiments of this application can acquire and process relevant data based on artificial intelligence technology. Artificial intelligence is the theory, method, technology, and application system that uses digital computers or machines controlled by digital computers to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use that knowledge to obtain optimal results.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A coordinated control method for integrating a heat pump and distillation, characterized in that, The method includes: Simultaneously acquire the internal state parameters and thermodynamic regulation parameters of the integrated heat pump; The evaporation saturation temperature and condensation saturation temperature of the integrated heat pump are obtained by performing characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters respectively. A two-dimensional coordinate system is constructed for the integrated heat pump, with the compressor frequency in the thermodynamic regulation parameters as the horizontal axis and the electronic expansion valve opening in the thermodynamic regulation parameters as the vertical axis. By connecting the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature respectively, the liquid slugging risk restricted area and the exhaust overheating restricted area of ​​the integrated heat pump can be obtained; Using the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints, the two-dimensional coordinate system is divided to obtain the stable region of the integrated heat pump, and the operating point with the highest heat pump energy efficiency ratio in the stable region is taken as the cooperative operation point of the integrated heat pump, wherein the stable region is the area with the highest matching degree between the compressor frequency and the electronic expansion valve opening. Based on the control variables and cooling load adjustment corresponding to the cooperative operation point, the AC motor drive signal and valve position control current signal of the integrated heat pump are modulated to obtain the cooperative control signal of the integrated heat pump, including: The compressor frequency and electronic expansion valve opening corresponding to the cooperative operation point are converted from digital to analog to obtain the AC motor drive signal and valve position control current signal of the integrated heat pump. The AC motor drive signal and the valve position control current signal are superimposed in phase, and the waveform of the superimposed signal is shaped to obtain the control signal of the integrated heat pump. The control signal is spectrally corrected based on the cooling load adjustment to obtain the coordinated control signal of the integrated heat pump.

2. The integrated coordinated control method for heat pump and distillation as described in claim 1, characterized in that, The synchronous acquisition of the integrated heat pump's internal state parameters and thermodynamic regulation parameters includes: The monitoring data of the integrated heat pump is periodically sampled to obtain the equipment status value and driving variables of the integrated heat pump; The device status values ​​and the driving variables are time-aligned to obtain the internal status parameters and thermodynamic regulation parameters of the integrated heat pump.

3. The integrated coordinated control method for heat pump and distillation as described in claim 1, characterized in that, The step of interpolating the suction pressure and condensation pressure in the internal state parameters to obtain the evaporation saturation temperature and condensation saturation temperature of the integrated heat pump includes: Based on the physical properties of the refrigerant in the integrated heat pump, piecewise linear interpolation is performed on the suction pressure and the condensation pressure to obtain the saturation temperature curve of the integrated heat pump. The temperature points corresponding to the suction pressure and the condensation pressure are extracted from the saturation temperature curve to obtain the evaporation saturation temperature and the condensation saturation temperature of the integrated heat pump.

4. The integrated coordinated control method for heat pump and distillation as described in claim 1, characterized in that, The construction of a two-dimensional coordinate system for the integrated heat pump, with the compressor frequency (among the thermodynamic regulation parameters) as the horizontal axis and the electronic expansion valve opening (among the thermodynamic regulation parameters) as the vertical axis, includes: The range of compressor frequency values ​​in the thermodynamic regulation parameters is used as the horizontal axis coordinate range of the integrated heat pump. The range of values ​​for the opening degree of the electronic expansion valve in the thermodynamic regulation parameters is taken as the vertical axis coordinate interval of the integrated heat pump. The integrated heat pump is constructed using the horizontal axis coordinate interval and the vertical axis coordinate interval.

5. The integrated coordinated control method for heat pump and distillation as described in claim 1, characterized in that, The connection of operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature respectively yields the liquid slugging risk zone and the exhaust overheating zone of the integrated heat pump, including: Set a lower safety limit corresponding to the evaporation saturation temperature and a higher safety limit corresponding to the condensation saturation temperature; In the two-dimensional coordinate system, liquid hammer risk points below the lower safety limit and exhaust overheat risk points above the upper safety limit are identified; The liquid slugging risk points and the exhaust overheating risk points are connected by transforming trajectories to form an envelope, thus obtaining the liquid slugging risk exclusion zone and the exhaust overheating exclusion zone of the integrated heat pump.

6. The integrated coordinated control method for heat pump and distillation as described in claim 5, characterized in that, The setting of the lower safety limit corresponding to the evaporation saturation temperature and the upper safety limit corresponding to the condensation saturation temperature includes: Based on the thermodynamic properties of the refrigerant in the integrated heat pump, the evaporation saturation temperature and the condensation saturation temperature are thermodynamically converted to obtain the saturation evaporation pressure and saturation condensation pressure of the integrated heat pump. Based on the minimum suction pressure and maximum discharge pressure of the integrated heat pump, the saturated evaporation pressure and the saturated condensation pressure are limited to obtain the safe lower limit of the evaporation pressure and the safe upper limit of the condensation pressure of the integrated heat pump.

7. The integrated coordinated control method for heat pump and distillation as described in claim 1, characterized in that, The two-dimensional coordinate system is divided using the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints to obtain the stable region of the integrated heat pump. The operating point with the highest heat pump energy efficiency ratio within the stable region is taken as the cooperative operation point of the integrated heat pump. The stable region is the area with the highest matching degree between the compressor frequency and the electronic expansion valve opening, including: Based on the evaporation saturation temperature and the condensation saturation temperature, the upper boundary curve of the liquid slugging risk zone and the lower boundary curve of the exhaust overheating zone are plotted in the two-dimensional coordinate system to obtain the non-restricted area of ​​the integrated heat pump. The region in the non-restricted area where the compressor frequency and the electronic expansion valve opening degree match the most is defined as the stable region of the integrated heat pump; The heat pump efficiency ratio is calculated by iterating through the operating points in the stable region. By performing local optimization on the operating point where the energy efficiency ratio of the heat pump is maximized, the cooperative operating point of the integrated heat pump is obtained.

8. The integrated coordinated control method for heat pump and distillation as described in claim 7, characterized in that, The formula for calculating the heat pump energy efficiency ratio is as follows: in, The heat pump's energy efficiency ratio is... To map the heating capacity, For Euler number, To coordinate the control of entropy, This is the compressor's reference power consumption. The frequency deviation penalty coefficient, This is the actual compressor frequency. This is the theoretically optimal frequency.

9. A coordinated control system for heat pump and distillation integration, used to implement the coordinated control method for heat pump and distillation integration as described in claims 1-8, characterized in that, The system includes: The data acquisition module synchronously acquires the internal state parameters and thermodynamic regulation parameters of the integrated heat pump; The saturation temperature module performs characteristic interpolation on the suction pressure and condensation pressure in the internal state parameters to obtain the evaporation saturation temperature and condensation saturation temperature of the integrated heat pump. The coordinate system construction module constructs a two-dimensional coordinate system for the integrated heat pump, with the compressor frequency in the thermal regulation parameters as the horizontal axis and the electronic expansion valve opening in the thermal regulation parameters as the vertical axis. The restricted area identification module connects the operating points in the two-dimensional coordinate system that exceed the evaporation saturation temperature and the condensation saturation temperature, respectively, to obtain the liquid slugging risk restricted area and the exhaust overheating restricted area of ​​the integrated heat pump; The collaborative operation point module uses the liquid slugging risk restricted area and the exhaust overheating restricted area as constraints to divide the two-dimensional coordinate system, obtain the stable region of the integrated heat pump, and take the operating point with the highest heat pump energy efficiency ratio in the stable region as the collaborative operation point of the integrated heat pump. The stable region is the area where the compressor frequency and the electronic expansion valve opening degree have the highest matching degree. The collaborative control signal module, based on the control variables and cooling load adjustment amount corresponding to the collaborative operation point, modulates the AC motor drive signal and valve position control current signal of the integrated heat pump to obtain the collaborative control signal of the integrated heat pump, including: The compressor frequency and electronic expansion valve opening corresponding to the cooperative operation point are converted from digital to analog to obtain the AC motor drive signal and valve position control current signal of the integrated heat pump. The AC motor drive signal and the valve position control current signal are superimposed in phase, and the waveform of the superimposed signal is shaped to obtain the control signal of the integrated heat pump. The control signal is spectrally corrected based on the cooling load adjustment to obtain the coordinated control signal of the integrated heat pump.

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