A control method and system for a dual-source heat pump building integrated energy supply system

Abstract

This invention discloses a control method and system for a dual-source heat pump building integrated energy supply system, relating to the field of HVAC technology. The method includes: collecting conductivity data, extracting characteristic frequency components from the conductivity data, and determining the state of the phase change material (PCM) based on these characteristic frequency components; triggering adjustment commands for the dual-source heat pump according to the PCM state, and outputting the dual-source heat pump energy supply mode; matching evaporation reference values ​​for different dual-source heat pump energy supply modes, and adjusting the compressor frequency according to the reference deviation to generate a variable frequency drive signal; dynamically adjusting the compressor frequency and electronic expansion valve opening based on the variable frequency drive signal, monitoring the pressure difference between the evaporator inlet and outlet after adjustment, and determining whether to perform bypass valve diversion; activating the heat recovery channel during bypass valve diversion to complete energy recovery and energy supply regulation. This invention achieves accurate determination of the PCM state and closed-loop regulation of energy flow through the synergy of conductivity characteristic frequency analysis and dynamic activation of the heat recovery channel.

Description

Technical Field

[0001] This invention relates to the field of heating, ventilation and air conditioning technology, and in particular to a control method and system for a dual-source heat pump building integrated energy supply system. Background Technology

[0002] In recent years, building energy supply systems have gradually evolved towards multi-source collaboration and intelligent control. Dual-source heat pump systems, by integrating the advantages of air-source and ground / water-source heat pumps, overcome the performance bottlenecks of single heat sources and have become a core path to improve energy supply stability and efficiency. Current mainstream solutions are centered on multimodal sensing and dynamic optimization control. By integrating phase change material energy storage, evaporator temperature feedback, and bypass valve diversion strategies, a multi-level collaborative architecture of heat source-energy storage-load is constructed. In phase change material status monitoring, conductivity characteristic frequency extraction technology is gradually replacing static threshold judgment, providing dynamic basis for optimizing heat source switching timing. The method of calculating the difference between the evaporator outlet temperature and the reference value is widely used for compressor frequency adaptive adjustment, improving system response speed. With the integration of artificial intelligence algorithms and multiphysics modeling technology, the control logic of dual-source heat pump building integrated energy supply systems is evolving towards forward data-driven and closed-loop feedback, laying the foundation for energy-saving optimization under complex operating conditions.

[0003] However, existing technologies have shortcomings in terms of dynamic sensing accuracy and energy closed-loop control. Phase change material (PCM) state monitoring relies on static threshold determination of single parameters such as conductivity, which makes it difficult to accurately characterize the nonlinear dynamic characteristics of the phase change process. This leads to mismatch in heat source switching timing, lack of dynamic reference value matching based on real-time heat source characteristics for evaporator outlet temperature control, lag in compressor frequency regulation, affecting system response speed and energy efficiency, and the lack of a coordinated mechanism between bypass valve diversion and heat recovery channels, failing to direct the diverted waste heat into the PCM energy storage area, resulting in energy waste and reduced control accuracy. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, this invention provides a control method for a dual-source heat pump building integrated energy supply system to address the shortcomings in dynamic sensing accuracy and energy closed-loop regulation.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides a control method for a dual-source heat pump building integrated energy supply system, comprising: collecting conductivity data, extracting characteristic frequency components of the conductivity data, and determining the state of the phase change material through the characteristic frequency components; triggering a regulation command for the dual-source heat pump according to the state of the phase change material, regulating the dual-source heat pump valve according to the regulation command, and outputting a dual-source heat pump energy supply mode; matching an evaporation reference value for different dual-source heat pump energy supply modes, monitoring the outlet evaporation temperature of the evaporator, calculating the reference deviation between the outlet evaporation temperature and the evaporation reference value using the difference method, and adjusting the compressor frequency according to the reference deviation to generate a variable frequency drive signal; dynamically adjusting the compressor frequency and the opening of the electronic expansion valve according to the variable frequency drive signal, monitoring the pressure difference between the inlet and outlet of the evaporator after adjustment, and determining whether to perform bypass valve diversion; activating the heat recovery channel in the bypass valve diversion, introducing the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel, and completing energy recovery and energy supply regulation.

[0008] As a preferred embodiment of the control method for the dual-source heat pump building integrated energy supply system of the present invention, the method includes: collecting conductivity data, performing low-pass filtering on the conductivity data, and generating conductivity time-series data.

[0009] Convert the conductivity time-series data into a frequency domain signal and output a spectral distribution map;

[0010] From the spectral distribution map, select the characteristic frequency range that shows energy convergence and reflects changes in the state of matter, extract the frequency point amplitude of the characteristic frequency range, and integrate the frequency point amplitude to generate an amplitude distribution matrix.

[0011] Set a threshold for the spectral components, compare the amplitude distribution matrix with the threshold for the spectral components, and determine the state of the phase change material.

[0012] In a preferred embodiment of the control method for the dual-source heat pump building integrated energy supply system of the present invention, the specific steps for converting conductivity time-series data into a frequency domain signal and outputting a spectrum distribution diagram are as follows:

[0013] The conductivity time series data is truncated into independent data segments according to a fixed time window;

[0014] Perform a Fast Fourier Transform on the independent data segments to output a frequency domain signal;

[0015] Extract the frequency value of each frequency point in the frequency domain signal, and perform square root operation on the real part and imaginary part of each frequency domain signal to generate the frequency point amplitude;

[0016] Sort the frequency values ​​in ascending order, draw a two-dimensional chart based on the sorted frequency values ​​and frequency point amplitudes, and output the spectrum distribution map.

[0017] In a preferred embodiment of the control method for the dual-source heat pump building integrated energy supply system described in this invention, the steps of triggering the adjustment command of the dual-source heat pump according to the phase change material state, adjusting the dual-source heat pump valve according to the adjustment command, and outputting the dual-source heat pump energy supply mode are as follows:

[0018] The adjustment command of the dual-source heat pump can be matched according to any state of the phase change material, whether it is solid, mixed or liquid.

[0019] The adjustment command is transmitted to the dual-source heat pump control center, triggering valve adjustment signals for both the air source heat pump and the solar heat pump.

[0020] Adjust the air source evaporation circuit valve and the solar direct expansion circuit valve according to the valve adjustment signal, and mark the power supply mode for the adjusted air source evaporation circuit valve and the solar direct expansion circuit valve.

[0021] As a preferred embodiment of the control method for the dual-source heat pump building integrated energy supply system described in this invention, the steps include: matching evaporation reference values ​​for different dual-source heat pump energy supply modes, monitoring the outlet evaporation temperature of the evaporator, calculating the reference deviation between the outlet evaporation temperature and the evaporation reference value using the difference method, adjusting the compressor frequency according to the reference deviation, and generating a variable frequency drive signal. The specific steps are as follows:

[0022] Match the evaporation reference value of the corresponding energy supply mode from the preset evaporation reference value table;

[0023] A temperature sensor monitors the evaporator outlet evaporation temperature in real time, and the reference deviation between the outlet evaporation temperature and the evaporation reference value is calculated by the difference method.

[0024] The compressor frequency is adjusted according to the magnitude and direction of the reference deviation to generate a frequency change, which is then converted into a variable frequency drive signal.

[0025] As a preferred embodiment of the control method for the dual-source heat pump building integrated energy supply system of the present invention, the steps of dynamically adjusting the compressor frequency and the opening of the electronic expansion valve according to the variable frequency drive signal, monitoring the pressure difference between the inlet and outlet of the evaporator after adjustment, and determining whether to perform bypass valve diversion are as follows:

[0026] The variable frequency drive signal is input to the variable frequency drive of the dual-source heat pump compressor, and the variable frequency drive adjusts the operating frequency of the dual-source heat pump compressor.

[0027] The opening of the electronic expansion valve is adjusted according to the real-time monitored evaporator outlet evaporation temperature.

[0028] After completing the dynamic adjustment of the operating frequency and the opening of the electronic expansion valve, the evaporator inlet pressure and evaporator outlet pressure are monitored at fixed time intervals to obtain the instantaneous pressure difference between the evaporator inlet and outlet.

[0029] By comparing the instantaneous pressure difference between the current fixed time interval and the adjacent fixed time interval, it is determined whether a bypass valve diversion is required.

[0030] As a preferred embodiment of the control method for the dual-source heat pump building integrated energy supply system of the present invention, the steps of activating the heat recovery channel in the bypass valve diversion, and introducing the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel to complete energy recovery and energy supply regulation are as follows:

[0031] After the bypass valve is started, an activation command is sent to the valve assembly of the heat recovery channel to open the inlet and outlet valves of the heat recovery channel and generate a heat energy transfer path.

[0032] During the bypass valve diversion process, a high-temperature working fluid is generated. The high-temperature working fluid is introduced into the heat recovery channel through the heat energy transfer path and exchanges heat with the circulating heat exchange medium. The heat exchange medium carries the heat energy into the phase change material energy storage area.

[0033] In the phase change material energy storage zone, the phase change material absorbs the heat energy of the heat exchange medium through heat conduction and stores the heat energy as latent heat.

[0034] Real-time monitoring of the latent heat in the energy storage area of ​​the phase change material to determine whether the energy storage status meets the standards;

[0035] When the energy storage status does not meet the standard, keep the inlet and outlet valves of the heat recovery channel open.

[0036] When the energy storage status meets the standard, energy recovery and energy supply regulation are completed by reverse activation of the heat exchange medium;

[0037] The high-temperature working fluid is a high-temperature refrigerant that is diverted from the exhaust end of the dual-source heat pump compressor during the bypass valve diversion process and carries the heat energy of the compressor operation.

[0038] Secondly, the present invention provides a control system for a dual-source heat pump building integrated energy supply system, comprising,

[0039] The status module is used to collect conductivity data, extract the characteristic frequency components of the conductivity data, and determine the state of the phase change material through the characteristic frequency components.

[0040] The mode module is used to trigger the adjustment command of the dual-source heat pump according to the state of the phase change material, adjust the dual-source heat pump valve according to the adjustment command, and output the dual-source heat pump energy supply mode.

[0041] The signal module is used to match the evaporation reference value for different dual-source heat pump power supply modes, monitor the outlet evaporation temperature of the evaporator, calculate the reference deviation between the outlet evaporation temperature and the evaporation reference value through the difference method, and adjust the compressor frequency according to the reference deviation to generate a variable frequency drive signal.

[0042] The flow diversion module is used to dynamically adjust the compressor frequency and the opening of the electronic expansion valve according to the variable frequency drive signal, monitor the pressure difference between the inlet and outlet of the evaporator after adjustment, and determine whether to perform bypass valve flow diversion.

[0043] The control module is used to activate the heat recovery channel in the bypass valve diversion, and to introduce the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel to complete energy recovery and energy supply control.

[0044] Thirdly, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, it implements any step of the control method for a dual-source heat pump building integrated energy supply system as described in the first aspect of the present invention.

[0045] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the control method for a dual-source heat pump building integrated energy supply system as described in the first aspect of the present invention.

[0046] The beneficial effects of this invention are as follows: By synergistically combining conductivity characteristic frequency analysis and dynamic activation of the heat recovery channel, accurate identification of the phase change material state and closed-loop control of energy flow are achieved. Collecting conductivity data and extracting characteristic frequency components allows for the quantification and identification of frequency domain response differences of the phase change material in different states of matter, improving the sensitivity and stability of state judgment. Upon determining a specific phase change state, the dual-source heat pump energy supply mode is switched, ensuring real-time matching between the energy supply strategy and the energy storage state. Furthermore, activating the heat recovery channel in the bypass valve diversion redirects the originally lost heat energy into the phase change material energy storage area, achieving not only immediate energy recovery and storage but also enhancing the adaptability of the dual-source heat pump building integrated energy supply system to load fluctuations. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A flowchart of the control method for a dual-source heat pump building integrated energy supply system.

[0049] Figure 2 A schematic diagram of the control system for a dual-source heat pump building integrated energy supply system.

[0050] Figure 3 This is a flowchart for conductivity data processing and phase change material state determination.

[0051] Figure 4 This is a flowchart for bypass valve diversion and heat recovery control. Detailed Implementation

[0052] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0053] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0054] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0055] Reference Figures 1-4 As one embodiment of the present invention, this embodiment provides a control method for a dual-source heat pump building integrated energy supply system, comprising the following steps:

[0056] S1. Collect conductivity data, extract the characteristic frequency components of the conductivity data, and determine the state of the phase change material through the characteristic frequency components.

[0057] Collect conductivity data, perform low-pass filtering on the conductivity data, and generate conductivity time series data;

[0058] Specifically, conductivity data is continuously collected by a FiSens FBG sensor array deployed in the phase change material region. The collection frequency is set according to the dynamic characteristics of the phase change material's state change, for example, acquiring conductivity data at a frequency of 100 times per second to ensure coverage of key stages in the phase change process. The conductivity data contains high-frequency noise caused by environmental electromagnetic interference, sensor drift, and local non-uniformity of the material, which needs to be processed by low-pass filtering technology. The low-pass filtering technology uses a fifth-order Butterworth filter with a set cutoff frequency (e.g., 5 Hz) to retain low-frequency signals related to the phase change material's state change while suppressing noise components above the cutoff frequency. The conductivity data after low-pass filtering forms a continuous time series, i.e., conductivity time series data. The conductivity time series data has a smooth waveform and clear abrupt change points, which can accurately reflect the transition characteristics of the phase change material from a solid state to a liquid or mixed state.

[0059] The conductivity time series data is truncated into independent data segments according to a fixed time window;

[0060] The conductivity time series data is segmented. A fixed time window is used to divide the continuous conductivity time series data into independent data segments that do not overlap. The length of the time window is set according to the typical period of the phase change material state change to ensure that each independent data segment contains complete local phase change characteristics. The truncation operation is achieved by extracting the conductivity time series data segment by segment.

[0061] Perform a Fast Fourier Transform on the independent data segments to output a frequency domain signal;

[0062] Specifically, a Fast Fourier Transform (FFT) is performed on each independent data segment to convert the time-domain conductivity data into a frequency-domain signal. The Fast Fourier Transform decomposes the independent data segment into a superposition of different frequency components through a discretization method, and outputs a frequency-domain signal containing frequency values ​​and corresponding amplitudes. For example, for a data segment containing 1000 sampling points, the Fast Fourier Transform will generate 500 frequency points, each frequency point corresponding to an amplitude. Each frequency point in the frequency-domain signal exists in complex form, and the real part and imaginary part of the complex number correspond to the cosine component and sine component of the frequency component in the frequency-domain signal, respectively.

[0063] Extract the frequency value of each frequency point in the frequency domain signal, and perform square root operation on the real part and imaginary part of each frequency domain signal to generate the frequency point amplitude;

[0064] Each frequency point in the frequency domain signal is analyzed to obtain the frequency value corresponding to each frequency point. The real and imaginary parts of the frequency point are extracted, and the frequency point amplitude is calculated by square root operation. The frequency point amplitude reflects the energy intensity of the frequency component in the conductivity signal. The higher the frequency point amplitude, the more significant the correlation between the frequency value and the state change of the phase change material.

[0065] The formula for frequency point amplitude is:

[0066] ;

[0067] in, Indicates the frequency point index identifier. Indicates the first The amplitude of each frequency point. Represents the real part of the frequency point. This represents the imaginary part of the frequency point;

[0068] Sort the frequency values ​​in ascending order, draw a two-dimensional chart based on the sorted frequency values ​​and frequency point amplitudes, and output the spectrum distribution map.

[0069] Arrange the frequency values ​​of all frequency points in ascending order and map the corresponding frequency point amplitudes to the same coordinate system. Plot a spectrum distribution diagram in a two-dimensional chart with the frequency values ​​as the horizontal axis and the frequency point amplitudes as the vertical axis. The spectrum distribution diagram intuitively presents the energy distribution of each frequency component in the conductivity signal. The energy convergence area corresponds to the characteristic frequency range of the phase change material's physical state change.

[0070] Select characteristic frequency ranges that reflect energy convergence and changes in the state of matter from the spectral distribution diagram;

[0071] Based on the regions in the spectral distribution map where the energy density is significantly higher than the background noise, frequency ranges where energy convergence occurs are selected. Combining the physical laws of the conductivity characteristics of phase change materials during solid-state, mixed-state, and liquid-state transitions, the characteristic frequency range related to the change of state is determined. The selection process must exclude false energy peaks caused by environmental interference or errors in the FiSens FBG sensor array to ensure that the characteristic frequency range strictly corresponds to the state evolution process of the phase change material.

[0072] Extract the frequency point amplitudes within the characteristic frequency range and integrate the frequency point amplitudes to generate an amplitude distribution matrix;

[0073] Extract the amplitude values ​​of all frequency points within the characteristic frequency range from the spectrum distribution map, arrange the frequency point amplitude values ​​in frequency order to form a one-dimensional array, and expand the one-dimensional array into a two-dimensional amplitude distribution matrix through matrix processing;

[0074] Based on the physical properties of phase change materials, a threshold for the spectral components is set, and the amplitude distribution matrix is ​​compared with the threshold for the spectral components to determine the state of the phase change material.

[0075] Based on the frequency domain response characteristics of the conductivity of phase change materials in solid, mixed and liquid states, spectral component thresholds are set for different states of matter. The setting of spectral component thresholds needs to comprehensively consider the thermodynamic parameters of the phase change material, the baseline value of conductivity, and environmental conditions to ensure that the range of spectral component thresholds can accurately distinguish the spectral characteristics of different states of matter. By comparing the amplitude of each frequency point in the amplitude distribution matrix with the spectral component threshold point by point, it is determined whether the phase change material is currently in a solid, mixed or liquid state, thereby providing a decision basis for the heat source switching of the dual-source heat pump building integrated energy supply system.

[0076] S2. Trigger the adjustment command of the dual-source heat pump according to the state of the phase change material, adjust the dual-source heat pump valve according to the adjustment command, and output the dual-source heat pump energy supply mode.

[0077] The adjustment command of the dual-source heat pump can be matched according to any state of the phase change material, whether it is solid, mixed or liquid.

[0078] Specifically, the generation of adjustment commands depends on the phase change material state-valve response mapping rule. The phase change material state-valve response mapping rule is established through historical operating data and the phase change material state change law to ensure the pertinence and effectiveness of adjustment commands under different states. After matching, the adjustment commands are stored in the form of structured data, including valve adjustment target value, power supply mode name and execution priority, to provide a basis for subsequent transmission and execution.

[0079] The adjustment command is transmitted to the dual-source heat pump control center, triggering valve adjustment signals for both the air source heat pump and the solar heat pump.

[0080] The adjustment command is transmitted to the dual-source heat pump control center via the communication link. The adjustment target values ​​and energy supply mode identifiers of the air source evaporator loop valve and the solar direct expansion loop valve are extracted. After receiving the adjustment command, the dual-source heat pump control center generates the corresponding valve adjustment signal according to the adjustment target value in the adjustment command. The valve adjustment signal contains the opening control command of the air source evaporator loop valve and the opening control command of the solar direct expansion loop valve. At the same time, the energy supply mode identifier is embedded in the valve adjustment signal to distinguish different energy supply modes. The generation of the valve adjustment signal follows the signal encoding rules. The signal encoding rules are set by defining data bits, check bits, start / stop bits and specific mapping methods (such as 4B / 5B, NRZ, Manchester code, etc.) to ensure the accuracy and integrity of the signal during transmission.

[0081] Adjust the air source evaporation circuit valve and the solar direct expansion circuit valve according to the valve adjustment signal, and mark the power supply mode for the adjusted air source evaporation circuit valve and the solar direct expansion circuit valve;

[0082] After receiving the valve adjustment signal, the air source evaporator circuit valve adjusts its opening to the target value according to the opening control command in the valve adjustment signal. The adjustment process is achieved through step drive or proportional control to ensure that the opening change meets the opening control command requirements. The solar direct expansion circuit valve synchronously receives the valve adjustment signal and adjusts its opening to the target value according to the opening control command in the signal. The adjustment process is also achieved through step drive or proportional control to ensure that the opening change is coordinated with the adjustment of the air source evaporator circuit valve.

[0083] After adjustment, the status information of the air source evaporator loop valve and the solar direct expansion loop valve is transmitted back to the control center through the feedback channel. The status information includes the current opening value and the adjustment completion status. According to the energy supply mode identifier in the valve adjustment signal, the control center assigns the corresponding energy supply mode name to the adjusted air source evaporator loop valve and the solar direct expansion loop valve, and writes the energy supply mode name into the valve status record as the basis for subsequent energy supply mode output. Finally, the adjustment results of the air source evaporator loop valve and the solar direct expansion loop valve together with the energy supply mode identifier constitute the current energy supply mode of the dual-source heat pump.

[0084] S3. Match the evaporation reference value for different dual-source heat pump energy supply modes, monitor the outlet evaporation temperature of the evaporator, calculate the reference deviation between the outlet evaporation temperature and the evaporation reference value using the difference method, and adjust the compressor frequency according to the reference deviation to generate a variable frequency drive signal.

[0085] Match the evaporation reference value of the corresponding energy supply mode from the preset evaporation reference value table;

[0086] Specifically, the evaporation baseline value table is preset based on the operating conditions of the dual-source heat pump building integrated energy supply system (such as energy supply mode and heat load demand) and the performance characteristics of heat pump equipment (such as evaporator design parameters and compressor efficiency curves). At the same time, it combines the safety boundaries (such as preventing frosting or overheating) and energy efficiency optimization goals (such as minimizing energy consumption or maximizing heat supply) in actual applications. The evaporation baseline value table uses the energy supply mode name as the index field and associates the evaporation baseline value range corresponding to different energy supply modes. When the energy supply mode identifier is received, it performs precise matching in the evaporation baseline value table according to the energy supply mode identifier, extracts the corresponding evaporation baseline value range, and uses the middle value or boundary value of the evaporation baseline value range as the evaporation baseline value of the current energy supply mode.

[0087] A temperature sensor monitors the evaporator outlet evaporation temperature in real time, and the reference deviation between the outlet evaporation temperature and the evaporation reference value is calculated by the difference method.

[0088] A temperature sensor is installed at the outlet pipe of the evaporator. It collects the outlet evaporation temperature through analog or digital signals. The sampling period is a fixed time interval (e.g., once every 1 second). The sampled outlet evaporation temperature is transmitted to the control center through a communication link. After receiving the outlet evaporation temperature, the control center calculates the difference between the outlet evaporation temperature and the evaporation reference value. If the result is positive, it means that the outlet temperature is higher than the reference value. If it is negative, it means that the outlet temperature is lower than the reference value. The difference calculation is implemented using floating-point arithmetic to ensure calculation accuracy. After the calculation is completed, the reference deviation is stored in the control center in the form of a value as an input parameter for subsequent compressor frequency adjustment.

[0089] The formula for the benchmark deviation is:

[0090] ;

[0091] in, This indicates the reference deviation between the outlet evaporation temperature and the evaporation reference value. This indicates the outlet evaporation temperature of the evaporator. Indicates the evaporation baseline value;

[0092] The compressor frequency is adjusted according to the magnitude and direction of the reference deviation to generate a frequency change, and the frequency change is converted into a variable frequency drive signal.

[0093] The adjustment range is divided according to the numerical range of the reference deviation. For example, when the absolute value of the reference deviation is less than or equal to 1℃, the compressor frequency is not adjusted. When the absolute value of the reference deviation is greater than 1℃ and less than or equal to 3℃, the adjustment range is ±5%. When the absolute value of the reference deviation is greater than 3℃, the adjustment range is ±10%. The adjustment direction is determined by the sign of the reference deviation (positive number corresponds to frequency decrease, negative number corresponds to frequency increase), generating the corresponding frequency change (such as +5% or -10%). The frequency change is expressed as a percentage. The generated frequency change is superimposed on the current compressor operating frequency to obtain the target frequency value. The target frequency value is converted into an analog signal through the frequency conversion drive signal conversion rules (such as mapping the 0%~100% frequency range to a 0V~10V voltage signal). The analog signal is sent to the compressor's frequency converter through the output interface to drive the compressor operating frequency to adjust to the target value.

[0094] S4. Dynamically adjust the compressor frequency and electronic expansion valve opening according to the variable frequency drive signal, monitor the pressure difference between the inlet and outlet of the evaporator after adjustment, and determine whether to perform bypass valve diversion.

[0095] The variable frequency drive signal is input to the variable frequency drive of the dual-source heat pump compressor, and the variable frequency drive adjusts the operating frequency of the dual-source heat pump compressor.

[0096] Specifically, the variable frequency drive signal is sent to the compressor's variable frequency drive through the output interface of the control center. The signal type is an analog voltage signal (such as 0V~10V). After receiving the analog voltage signal, the variable frequency drive converts the analog voltage signal into digital control commands to drive the compressor motor to rotate. The compressor motor speed is proportional to the target frequency value. When the frequency increases, the speed increases, and when the frequency decreases, the speed decreases. The variable frequency drive monitors the actual output frequency through a real-time feedback loop to ensure that the output frequency is consistent with the target frequency value.

[0097] The opening of the electronic expansion valve is adjusted according to the real-time monitored evaporator outlet evaporation temperature.

[0098] The opening of the electronic expansion valve is dynamically adjusted based on the reference deviation obtained from the real-time monitoring of the evaporator outlet evaporation temperature. The reference deviation generates the opening adjustment command of the electronic expansion valve through the set opening adjustment rules (such as a decrease in opening for positive deviation and an increase in opening for negative deviation). The opening adjustment command is expressed in percentage form (such as +5% or -10%). After receiving the opening adjustment command, the electronic expansion valve adjusts the valve core opening according to the command value. The change in opening directly affects the refrigerant flow. During the adjustment process, the control logic of the electronic expansion valve follows a closed-loop feedback mechanism, which ensures that the actual opening is consistent with the target opening by real-time monitoring of the valve core position feedback signal.

[0099] After completing the dynamic adjustment of the operating frequency and the opening of the electronic expansion valve, the evaporator inlet pressure and evaporator outlet pressure are monitored at fixed time intervals to obtain the instantaneous pressure difference between the evaporator inlet and outlet.

[0100] Pressure sensors are installed in the inlet and outlet pipes of the evaporator. They collect pressure data through analog or digital signals, with a sampling period of a fixed time interval (e.g., once every 2 seconds). The sampled pressure data is transmitted through a communication link and stored as inlet pressure value and outlet pressure value, respectively. The inlet pressure value and outlet pressure value are compared to obtain the instantaneous pressure difference between the inlet and outlet of the evaporator. During the monitoring process, the sampling period of the pressure sensor is synchronized with the compressor frequency adjustment period to ensure data timestamp consistency.

[0101] Compare the instantaneous pressure difference between the current fixed time interval and the adjacent fixed time interval to determine whether a bypass valve diversion is required;

[0102] By comparing the instantaneous differential pressure value at the current fixed time interval with the instantaneous differential pressure value at adjacent fixed time intervals, if the instantaneous differential pressure change exceeds the differential pressure threshold (e.g., ±10 kPa), it indicates that the evaporator differential pressure fluctuation is severe and the bypass valve needs to be triggered for diversion. If the instantaneous differential pressure change does not exceed the differential pressure threshold (e.g., ±10 kPa), it indicates that the evaporator differential pressure fluctuation is normal and the bypass valve does not need to be triggered for diversion. The differential pressure threshold setting should be based on the physical characteristics of the equipment (e.g., the evaporator design pressure range, material pressure bearing capacity), historical operating data (e.g., the differential pressure fluctuation range under normal operating conditions), safety boundaries (e.g., the minimum / maximum permissible deviation to prevent equipment overload or damage), and the manufacturer's technical specifications.

[0103] S5. Activate the heat recovery channel in the bypass valve diversion, and introduce the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel to complete energy recovery and energy supply regulation.

[0104] After the bypass valve is started, an activation command is sent to the valve assembly of the heat recovery channel to open the inlet and outlet valves of the heat recovery channel and generate a heat energy transfer path.

[0105] Specifically, when the bypass valve starts diverting the flow, it sends an activation command to the valve assembly of the heat recovery channel through the digital signal output interface. The activation command includes the opening commands for the inlet and outlet valves. After receiving the activation command, the valve assembly executes the sequential opening (such as opening the inlet valve first and then the outlet valve) to adjust the valve core position to the fully open state, ensuring that the physical path of the heat recovery channel is connected. The generation of the heat energy transfer path depends on the precise control of the valve opening. After the heat energy transfer path is generated, the inlet and outlet of the heat recovery channel form a stable fluid channel, providing the basic conditions for the subsequent transmission of high-temperature working fluid.

[0106] During the bypass valve diversion process, a high-temperature working fluid is generated. The high-temperature working fluid is introduced into the heat recovery channel through the heat energy transfer path and exchanges heat with the circulating heat exchange medium. The heat exchange medium carries the heat energy into the phase change material energy storage area.

[0107] During the bypass valve diversion operation, part of the refrigerant flows through the bypass path to form a high-temperature working fluid (e.g., the temperature is higher than the evaporator outlet temperature). The high-temperature working fluid enters the heat recovery channel through the heat energy transfer path. The heat exchange medium (e.g., water or antifreeze) preset in the heat recovery channel circulates at a fixed flow rate. The heat exchange medium and the high-temperature working fluid exchange heat in the heat exchange section of the heat recovery channel (e.g., plate heat exchanger or shell-and-tube heat exchanger). The heat exchange follows Fourier's law (the rate of heat conduction is proportional to the temperature difference). After absorbing the sensible heat of the high-temperature working fluid, the temperature of the heat exchange medium rises. The heated heat exchange medium enters the phase change material energy storage area through the outlet pipe. The flow path of the heat exchange medium is consistent with the opening state of the inlet valve and outlet valve of the heat recovery channel to ensure the continuity of heat transfer.

[0108] In the phase change material energy storage zone, the phase change material absorbs the heat energy of the heat exchange medium through heat conduction and stores the heat energy as latent heat.

[0109] After the heat exchange medium enters the phase change material energy storage area, the heat energy carried by the heat exchange medium is transferred to the phase change material through the contact surface (such as metal fins or direct contact). During the solid-liquid phase change process, the phase change material absorbs the heat energy of the heat exchange medium and stores the absorbed heat energy in the form of latent heat. The heat transfer efficiency of the phase change material depends on the material properties (such as thermal conductivity and phase change temperature range) and the structural design of the energy storage area (such as packing density and heat exchange area). During the energy storage process, the state of the phase change material gradually changes from solid to liquid or is maintained in a mixed state (solid-liquid coexistence). The state change is monitored in real time by temperature sensors and phase state detection devices (such as infrared imaging or pressure sensors) installed in the energy storage area. The completion of latent heat storage is jointly determined by the phase change progress of the phase change material (such as the liquid ratio) and the thermal balance state of the energy storage area.

[0110] Real-time monitoring of the latent heat in the energy storage area of ​​the phase change material to determine whether the energy storage status meets the standards;

[0111] The dynamic parameters of the latent heat energy storage status of the phase change material energy storage zone are monitored in real time. These dynamic parameters include the temperature distribution of the phase change material, the liquid volume ratio, and the inlet and outlet temperature difference of the heat exchange medium. The energy storage status is assessed based on the dynamic absorption characteristics of the phase change material for heat energy. The assessment is made by comprehensively judging the uniformity of the phase change material temperature distribution, the stability of the liquid volume ratio, and the degree of stabilization of the inlet and outlet temperature difference of the heat exchange medium. When the phase change material temperature distribution tends to be uniform and the liquid volume ratio does not change significantly, it indicates that the energy storage process has entered an equilibrium state and the energy storage status meets the standard. When there is still a significant gradient in the phase change material temperature distribution, the liquid volume ratio continues to increase, or the inlet and outlet temperature difference of the heat exchange medium fluctuates greatly, it indicates that the energy storage process is still in progress and the energy storage status does not meet the standard.

[0112] When the energy storage status does not meet the standard, keep the inlet and outlet valves of the heat recovery channel open.

[0113] When the energy storage status meets the standard, energy recovery and energy supply regulation are completed by reverse activation of the heat exchange medium;

[0114] If the energy storage status is not up to standard, the inlet and outlet valves of the heat recovery channel remain open to ensure a continuous flow of high-temperature working fluid into the energy storage area and continued circulation of the heat exchange medium. While maintaining the open status, the inlet and outlet valves must retain their current opening positions to avoid mechanical wear due to frequent start-stop cycles. If the energy storage status is up to standard, the control center sends a reverse activation command to the valve assembly of the heat recovery channel to close the inlet and outlet valves, cutting off the heat transfer path. Simultaneously, the control center sends a reverse activation command to the circulation pump of the heat exchange medium to adjust the flow direction of the heat exchange medium, releasing the stored latent heat to the energy demand area of ​​the dual-source heat pump building (such as heating circuits or hot water storage tanks). The energy recovery process achieves directional transfer of heat energy through the reverse flow of the heat exchange medium. The energy supply regulation effect is verified by the output temperature or heat supply of the dual-source heat pump building integrated energy supply system. After the reverse activation is completed, the heat recovery channel enters standby mode, and the valve opening and heat exchange medium flow direction return to their initial settings, preparing for the next energy storage cycle.

[0115] This embodiment also provides a control system for a dual-source heat pump building integrated energy supply system, including:

[0116] The status module is used to collect conductivity data, extract the characteristic frequency components of the conductivity data, and determine the state of the phase change material through the characteristic frequency components.

[0117] The mode module is used to trigger the adjustment command of the dual-source heat pump according to the state of the phase change material, adjust the dual-source heat pump valve according to the adjustment command, and output the dual-source heat pump energy supply mode.

[0118] The signal module is used to match the evaporation reference value for different dual-source heat pump power supply modes, monitor the outlet evaporation temperature of the evaporator, calculate the reference deviation between the outlet evaporation temperature and the evaporation reference value through the difference method, and adjust the compressor frequency according to the reference deviation to generate a variable frequency drive signal.

[0119] The flow diversion module is used to dynamically adjust the compressor frequency and the opening of the electronic expansion valve according to the variable frequency drive signal, monitor the pressure difference between the inlet and outlet of the evaporator after adjustment, and determine whether to perform bypass valve flow diversion.

[0120] The control module is used to activate the heat recovery channel in the bypass valve diversion, and to introduce the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel to complete energy recovery and energy supply control.

[0121] This embodiment also provides a computer device applicable to the control method of a dual-source heat pump building integrated energy supply system, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the control method of the dual-source heat pump building integrated energy supply system as proposed in the above embodiment.

[0122] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0123] This embodiment also provides a storage medium storing a computer program. When executed by a processor, the program implements the control method for implementing a dual-source heat pump building integrated energy supply system as proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0124] In summary, this invention achieves precise identification of the phase change material (PCM) state and closed-loop control of energy flow through the synergy of conductivity characteristic frequency analysis and dynamic activation of the heat recovery channel. By collecting conductivity data and extracting characteristic frequency components, the frequency domain response differences of PCM in different states of matter can be quantified and identified, improving the sensitivity and stability of state judgment. Upon determining a specific PCM state, the dual-source heat pump energy supply mode is switched, ensuring real-time matching between the energy supply strategy and the energy storage state. Furthermore, by activating the heat recovery channel in the bypass valve diversion, the originally lost heat energy is introduced into the PCM energy storage area. This not only achieves immediate energy recovery, conversion, and storage but also enhances the adaptability of the dual-source heat pump building integrated energy supply system to load fluctuations.

[0125] 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, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A control method for a dual-source heat pump building integrated energy supply system, characterized in that: include, Collect conductivity data, extract the characteristic frequency components of the conductivity data, and determine the state of the phase change material through the characteristic frequency components; The specific steps for collecting conductivity data, extracting characteristic frequency components from the conductivity data, and determining the state of the phase change material based on these characteristic frequency components are as follows: Collect conductivity data, perform low-pass filtering on the conductivity data, and generate conductivity time series data; Convert the conductivity time-series data into a frequency domain signal and output a spectral distribution map; From the spectral distribution map, select the characteristic frequency range that shows energy convergence and reflects changes in the state of matter, extract the frequency point amplitude of the characteristic frequency range, and integrate the frequency point amplitude to generate an amplitude distribution matrix. Set a threshold for the spectral components, compare the amplitude distribution matrix with the threshold for the spectral components, and determine the state of the phase change material. The dual-source heat pump is activated by triggering the adjustment command of the phase change material state, and the dual-source heat pump valve is adjusted according to the adjustment command to output the dual-source heat pump energy supply mode. To match the evaporation reference value for different dual-source heat pump energy supply modes, monitor the outlet evaporation temperature of the evaporator, calculate the reference deviation between the outlet evaporation temperature and the evaporation reference value using the difference method, and adjust the compressor frequency according to the reference deviation to generate a variable frequency drive signal; The compressor frequency and electronic expansion valve opening are dynamically adjusted according to the variable frequency drive signal. The pressure difference between the inlet and outlet of the evaporator after adjustment is monitored to determine whether to perform bypass valve diversion. The heat recovery channel is activated in the bypass valve diversion, and the heat energy generated by the bypass valve diversion is introduced into the phase change material energy storage area of ​​the heat recovery channel to complete energy recovery and energy supply regulation.

2. The control method for the dual-source heat pump building integrated energy supply system as described in claim 1, characterized in that: The specific steps for converting conductivity time-series data into a frequency domain signal and outputting a spectral distribution map are as follows: The conductivity time series data is truncated into independent data segments according to a fixed time window; Perform a Fast Fourier Transform on the independent data segments to output a frequency domain signal; Extract the frequency value of each frequency point in the frequency domain signal, and perform square root operation on the real part and imaginary part of each frequency domain signal to generate the frequency point amplitude; Sort the frequency values ​​in ascending order, draw a two-dimensional chart based on the sorted frequency values ​​and frequency point amplitudes, and output the spectrum distribution map.

3. The control method for the dual-source heat pump building integrated energy supply system as described in claim 1, characterized in that: The specific steps are as follows: triggering the adjustment command of the dual-source heat pump according to the phase change material state, adjusting the dual-source heat pump valve according to the adjustment command, and outputting the dual-source heat pump power supply mode. The adjustment command of the dual-source heat pump can be matched according to any state of the phase change material, whether it is solid, mixed or liquid. The adjustment command is transmitted to the dual-source heat pump control center, triggering valve adjustment signals for both the air source heat pump and the solar heat pump. Adjust the air source evaporation circuit valve and the solar direct expansion circuit valve according to the valve adjustment signal, and mark the power supply mode for the adjusted air source evaporation circuit valve and the solar direct expansion circuit valve.

4. The control method for the dual-source heat pump building integrated energy supply system as described in claim 1, characterized in that: The process involves matching evaporation reference values ​​for different dual-source heat pump energy supply modes, monitoring the evaporator outlet evaporation temperature, calculating the reference deviation between the outlet evaporation temperature and the evaporation reference value using the difference method, and adjusting the compressor frequency according to the reference deviation to generate a variable frequency drive signal. The specific steps are as follows: Match the evaporation reference value of the corresponding energy supply mode from the preset evaporation reference value table; A temperature sensor monitors the evaporator outlet evaporation temperature in real time, and the reference deviation between the outlet evaporation temperature and the evaporation reference value is calculated by the difference method. The compressor frequency is adjusted according to the magnitude and direction of the reference deviation to generate a frequency change, which is then converted into a variable frequency drive signal.

5. The control method for the dual-source heat pump building integrated energy supply system as described in claim 1, characterized in that: The specific steps are as follows: dynamically adjusting the compressor frequency and electronic expansion valve opening based on the variable frequency drive signal, monitoring the pressure difference between the evaporator inlet and outlet after adjustment, and determining whether to perform bypass valve diversion. The variable frequency drive signal is input to the variable frequency drive of the dual-source heat pump compressor, and the variable frequency drive adjusts the operating frequency of the dual-source heat pump compressor. The opening of the electronic expansion valve is adjusted according to the real-time monitored evaporator outlet evaporation temperature. After completing the dynamic adjustment of the operating frequency and the opening of the electronic expansion valve, the evaporator inlet pressure and evaporator outlet pressure are monitored at fixed time intervals to obtain the instantaneous pressure difference between the evaporator inlet and outlet. By comparing the instantaneous pressure difference between the current fixed time interval and the adjacent fixed time interval, it is determined whether a bypass valve diversion is required.

6. The control method for the dual-source heat pump building integrated energy supply system as described in claim 1, characterized in that: The process of activating the heat recovery channel during bypass valve diversion, and directing the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel, thereby completing energy recovery and power supply regulation, involves the following specific steps: After the bypass valve is started, an activation command is sent to the valve assembly of the heat recovery channel to open the inlet and outlet valves of the heat recovery channel and generate a heat energy transfer path. During the bypass valve diversion process, a high-temperature working fluid is generated. The high-temperature working fluid is introduced into the heat recovery channel through the heat energy transfer path and exchanges heat with the circulating heat exchange medium. The heat exchange medium carries the heat energy into the phase change material energy storage area. In the phase change material energy storage zone, the phase change material absorbs the heat energy of the heat exchange medium through heat conduction and stores the heat energy as latent heat. Real-time monitoring of the latent heat in the energy storage area of ​​the phase change material to determine whether the energy storage status meets the standards; When the energy storage status does not meet the standard, keep the inlet and outlet valves of the heat recovery channel open. When the energy storage status meets the standard, energy recovery and energy supply regulation are completed by reverse activation of the heat exchange medium; The high-temperature working fluid is a high-temperature refrigerant that is diverted from the exhaust end of the dual-source heat pump compressor during the bypass valve diversion process and carries the heat energy of the compressor operation.

7. A control system for a dual-source heat pump building integrated energy supply system, based on the control method for the dual-source heat pump building integrated energy supply system according to any one of claims 1 to 6, characterized in that: include, The status module is used to collect conductivity data, extract the characteristic frequency components of the conductivity data, and determine the state of the phase change material through the characteristic frequency components. The mode module is used to trigger the adjustment command of the dual-source heat pump according to the state of the phase change material, adjust the dual-source heat pump valve according to the adjustment command, and output the dual-source heat pump energy supply mode. The signal module is used to match the evaporation reference value for different dual-source heat pump power supply modes, monitor the outlet evaporation temperature of the evaporator, calculate the reference deviation between the outlet evaporation temperature and the evaporation reference value through the difference method, and adjust the compressor frequency according to the reference deviation to generate a variable frequency drive signal. The flow diversion module is used to dynamically adjust the compressor frequency and the opening of the electronic expansion valve according to the variable frequency drive signal, monitor the pressure difference between the inlet and outlet of the evaporator after adjustment, and determine whether to perform bypass valve flow diversion. The control module is used to activate the heat recovery channel in the bypass valve diversion, and to introduce the heat energy generated by the bypass valve diversion into the phase change material energy storage area of ​​the heat recovery channel to complete energy recovery and energy supply control.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the control method for the dual-source heat pump building integrated energy supply system according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the control method for the dual-source heat pump building integrated energy supply system according to any one of claims 1 to 6.

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