Control method and system for comprehensive energy supply system of double-source heat pump building

Abstract

The invention discloses a control method and system for a comprehensive energy supply system of a double-source heat pump building, and relates to the technical field of heating, ventilation and air conditioning, and the control method comprises the following steps: collecting conductivity data, extracting a characteristic frequency component of the conductivity data, and judging the state of a phase change material through the characteristic frequency component; an adjusting instruction of the double-source heat pump is triggered according to the state of the phase change material, and a double-source heat pump energy supply mode is output; evaporation reference values are matched for different dual-source heat pump energy supply modes, the frequency of a compressor is adjusted according to the reference deviation, and a variable frequency driving signal is generated; dynamically adjusting compressor frequency and electronic expansion valve opening according to the variable frequency driving signal, monitoring inlet and outlet pressure difference of an evaporator after adjustment, and judging whether bypass valve shunting is carried out or not; a heat recovery channel is activated in bypass valve shunting, and energy recovery and energy supply regulation and control are completed. Through cooperation of conductivity characteristic frequency analysis and dynamic activation of the heat recovery channel, accurate judgment of the state of the phase change material and closed-loop regulation and control of energy flow are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heating, ventilation and air conditioning technology, and particularly relates to a control method and system of a dual-source heat pump building comprehensive energy supply system. BACKGROUND

[0002] In recent years, building energy supply systems gradually evolve towards multi-source collaboration and intelligent control. Dual-source heat pump systems integrate the advantages of air source and ground / water source heat pumps, break through the performance bottleneck of single heat source, and become the core path to improve energy supply stability and energy efficiency. The current mainstream scheme takes multi-modal sensing and dynamic optimization control as the core, and through the integration of phase change material energy storage, evaporator temperature feedback and bypass valve shunt strategy, a multi-level collaborative architecture of heat source-energy storage-load is constructed. In the aspect of phase change material state monitoring, the conductivity characteristic frequency extraction technology gradually replaces the static threshold judgment, providing dynamic basis for heat source switching time optimization. The difference calculation method of evaporator outlet temperature and reference value is widely used for compressor frequency adaptive adjustment, improving system response speed. With the integration of artificial intelligence algorithms and multi-physical field modeling technology, the control logic of the dual-source heat pump building comprehensive energy supply system is evolving towards data-driven and closed-loop feedback, laying a foundation for energy saving optimization under complex conditions.

[0003] However, the prior art has deficiencies in dynamic sensing accuracy and energy closed-loop control. Phase change material state monitoring relies on static threshold judgment of a single parameter such as conductivity, which is difficult to accurately depict the nonlinear dynamic characteristics in the phase change process, resulting in mismatch of heat source switching time, lack of dynamic reference value matching based on real-time heat source characteristics in evaporator outlet temperature control, lag in compressor frequency adjustment, affecting system response speed and energy efficiency, and lack of coordination mechanism for bypass valve shunt and heat recovery channel, failing to direct the shunt waste heat into the phase change material energy storage area, causing energy waste and control accuracy decline. SUMMARY

[0004] In view of the above existing problems, the present application is proposed.

[0005] Therefore, the present application provides a control method of a dual-source heat pump building comprehensive energy supply system to solve the problem of insufficient dynamic sensing accuracy and energy closed-loop control.

[0006] To solve the above technical problems, the present application provides the following technical solutions: In a first aspect, the present application provides a control method of a dual-source heat pump building integrated energy supply system, which comprises: collecting electric conductivity data, extracting a characteristic frequency component of the electric conductivity data, and determining a phase change material state through the characteristic frequency component; triggering an adjustment instruction of the dual-source heat pump according to the phase change material state, adjusting a valve of the dual-source heat pump according to the adjustment instruction, 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 an outlet evaporation temperature of an evaporator, calculating a reference deviation of the outlet evaporation temperature and the evaporation reference value through a difference method, adjusting a compressor frequency according to the reference deviation, and generating a variable frequency driving signal; dynamically adjusting the compressor frequency and an electronic expansion valve opening degree according to the variable frequency driving signal, monitoring an inlet and outlet pressure difference of the evaporator after adjustment, and judging whether to perform bypass valve shunting; in the bypass valve shunting, activating a heat recovery channel, guiding heat energy generated by the bypass valve shunting into a phase change material energy storage area of the heat recovery channel, and completing energy recovery and energy supply regulation.

[0007] As a preferred scheme of the control method of the dual-source heat pump building integrated energy supply system, the electric conductivity data is subjected to low-pass filtering processing to generate electric conductivity time series data. The electric conductivity time series data is converted into a frequency domain signal, and a frequency spectrum distribution map is output. A characteristic frequency range that converges energy and reflects a material state change is screened from the frequency spectrum distribution map, a frequency point amplitude of the characteristic frequency range is extracted, and the frequency point amplitudes are integrated to generate an amplitude distribution matrix. A frequency spectrum component threshold value is set, the amplitude distribution matrix is compared with the frequency spectrum component threshold value, and a phase change material state is judged.

[0008] As a preferred scheme of the control method of the dual-source heat pump building integrated energy supply system, the conversion of the electric conductivity time series data into the frequency domain signal and the output of the frequency spectrum distribution map specifically comprise the following steps. The electric conductivity time series data is truncated into independent data segments according to a fixed time window. The independent data segments are subjected to fast Fourier transform to output the frequency domain signal. The frequency values of each frequency point in the frequency domain signal are extracted, and the real part and the imaginary part of each frequency domain signal are subjected to square root operation to generate a frequency point amplitude. The frequency values are arranged in ascending order, a two-dimensional chart is drawn according to the arranged frequency values and the frequency point amplitudes, and the frequency spectrum distribution map is output.

[0009] As a preferred scheme of the control method of the dual-source heat pump building integrated energy supply system, the triggering of the adjustment instruction of the dual-source heat pump according to the phase change material state, the valve adjustment of the dual-source heat pump according to the adjustment instruction, and the output of the dual-source heat pump energy supply mode specifically comprise the following steps. According to any state of the phase change material solid, mixed state and liquid state, the adjustment instruction of the double source heat pump is matched; The adjustment instruction is transmitted to the double source heat pump control center, and the valve adjustment signal of the air source heat pump and the solar heat pump is triggered; According to the valve adjustment signal, the air source evaporation circuit valve and the solar direct expansion circuit valve are adjusted, and the energy supply mode of the adjusted air source evaporation circuit valve and the solar direct expansion circuit valve is marked.

[0010] As a preferred scheme of the control method of the double source heat pump building comprehensive energy supply system, wherein: the evaporation reference value is matched for different double source heat pump energy supply modes, the outlet evaporation temperature of the evaporator is monitored, the reference deviation of the outlet evaporation temperature and the evaporation reference value is calculated by difference method, the frequency of the compressor is adjusted according to the reference deviation, and the variable frequency driving signal is generated, and the specific steps are, The evaporation reference value corresponding to the energy supply mode is matched from the preset evaporation reference value table; The temperature sensor monitors the outlet evaporation temperature of the evaporator in real time, and the reference deviation of the outlet evaporation temperature and the evaporation reference value is calculated by difference method; According to the size and direction of the reference deviation, the frequency of the compressor is adjusted, the frequency variation is generated, and the frequency variation is converted into a variable frequency driving signal.

[0011] As a preferred scheme of the control method of the double source heat pump building comprehensive energy supply system, wherein: the frequency of the compressor and the opening degree of the electronic expansion valve are dynamically adjusted according to the variable frequency driving signal, the inlet and outlet pressure difference of the evaporator after adjustment is monitored, and it is judged whether the bypass valve shunt is performed, and the specific steps are, The variable frequency driving signal is input into the variable frequency driver of the double source heat pump compressor, and the variable frequency driver adjusts the operating frequency of the double source heat pump compressor; The opening degree of the electronic expansion valve is adjusted according to the real-time monitored outlet evaporation temperature of the evaporator; After completing the dynamic adjustment of the operating frequency and the opening degree of the electronic expansion valve, the inlet pressure of the evaporator and the outlet pressure of the evaporator are monitored according to the fixed time interval, and the instantaneous pressure difference of the inlet and outlet of the evaporator is obtained; The instantaneous pressure difference of the current fixed time interval and the adjacent fixed time interval is compared, and it is judged whether the bypass valve shunt is needed.

[0012] As a preferred scheme of the control method of the double source heat pump building comprehensive energy supply system, wherein: in the bypass valve shunt, the heat recovery channel is activated, the heat energy generated by the bypass valve shunt is introduced into the phase change material energy storage area of the heat recovery channel, and the energy recovery and energy supply regulation are completed, and the specific steps are, After the bypass valve shunt is started, the activation instruction is sent to the valve assembly of the heat recovery channel, the inlet valve and the outlet valve of the heat recovery channel are opened, and the heat energy transmission path is generated; High-temperature working medium is generated in the bypass valve shunting process, and is guided into the heat recovery channel through a heat energy transmission path and exchanges heat with a circulating heat exchange medium, and the heat exchange medium carries heat energy into the phase change material energy storage area; The phase change material in the phase change material energy storage area absorbs the heat energy of the heat exchange medium through heat conduction and stores the heat energy as latent heat; The energy storage state of the latent heat of the phase change material energy storage area is monitored in real time, and whether the energy storage state meets the standard is determined; When the energy storage state does not meet the standard, the inlet valve and the outlet valve of the heat recovery channel are kept open; When the energy storage state meets the standard, energy recovery and energy supply regulation are completed by reversely activating the heat exchange medium; The high-temperature working medium is high-temperature refrigerant diverted and guided from the exhaust end of the dual-source heat pump compressor in the bypass valve shunting process and carries the heat energy of the compressor operation.

[0013] In a second aspect, the present application provides a control system of a dual-source heat pump building comprehensive energy supply system, comprising, A state module is configured to collect electrical conductivity data, extract characteristic frequency components of the electrical conductivity data, and determine the phase change material state through the characteristic frequency components; A mode module is configured to trigger adjustment instructions of the dual-source heat pump according to the phase change material state, adjust the valves of the dual-source heat pump according to the adjustment instructions, and output the dual-source heat pump energy supply mode; A signal module is configured to match evaporation reference values for different dual-source heat pump energy supply modes, monitor the outlet evaporation temperature of the evaporator, calculate the reference deviation of the outlet evaporation temperature and the evaporation reference value through the difference method, adjust the compressor frequency according to the reference deviation, and generate a variable frequency drive signal; A shunting module is configured to dynamically adjust the compressor frequency and the electronic expansion valve opening degree 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 shunting; A regulation module is configured to activate the heat recovery channel in the bypass valve shunting, guide the heat energy generated in the bypass valve shunting into the phase change material energy storage area of the heat recovery channel, and complete energy recovery and energy supply regulation.

[0014] In a third aspect, the present application provides a computer device comprising a memory and a processor, and the memory stores a computer program, wherein the computer program is executed by the processor to implement any step of the control method of the dual-source heat pump building comprehensive energy supply system according to the first aspect of the present application.

[0015] In a fourth aspect, the present application provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement any step of the control method of the dual-source heat pump building comprehensive energy supply system according to the first aspect of the present application.

[0016] The present application has the beneficial effects that: through the synergy of the conductivity characteristic frequency analysis and the dynamic activation of the heat recovery channel, the precise discrimination of the phase change material state and the closed-loop regulation of the energy flow are realized. The conductivity data are collected and the characteristic frequency components are extracted, so that the frequency domain response differences of the phase change material in different states are quantitatively identified, the sensitivity and stability of the state judgment are improved, the dual-source heat pump energy supply mode switching is triggered after the specific phase change state is determined, the real-time matching of the energy supply strategy and the energy storage state is ensured, and in the bypass valve shunting, the heat recovery channel is activated, the originally wasted heat energy is introduced into the phase change material energy storage area, not only the immediate conversion and storage of the energy recovery are realized, but also the adaptability of the dual-source heat pump building comprehensive energy supply system to the load fluctuation is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0018] Fig. 1 The flow chart of the control method of the dual-source heat pump building comprehensive energy supply system.

[0019] Fig. 2 The schematic diagram of the control system of the dual-source heat pump building comprehensive energy supply system.

[0020] Fig. 3 The flow chart of the conductivity data processing and the phase change material state judgment.

[0021] Fig. 4 The flow chart of the bypass valve shunting and the heat recovery control. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification.

[0023] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0024] Second, the "one embodiment" or "an embodiment" referred to herein can include a particular feature, structure, or characteristic. The various embodiments appearing at different places in this specification can not all refer to the same embodiment or to the same implementations or alternatives of an embodiment.

[0025] Referring to Figs. 1-4 For one embodiment of the present application, the embodiment provides a control method of a dual-source heat pump building integrated energy supply system, comprising the following steps: S1, collecting electrical conductivity data, extracting characteristic frequency components of the electrical conductivity data, and determining the phase change material state through the characteristic frequency components.

[0026] Collecting electrical conductivity data, performing low-pass filtering processing on the electrical conductivity data, and generating electrical conductivity time series data; Specifically, the electrical conductivity data is continuously collected by the FiSens FBG sensor array arranged in the phase change material region, and the collection frequency is set according to the dynamic characteristics of the phase change material state change, for example, the electrical conductivity data is acquired at a frequency of 100 times per second, to ensure covering the key stages in the phase change process. The electrical conductivity data contains high-frequency noise caused by environmental electromagnetic interference, sensor drift and material local non-uniformity, which needs to be processed by low-pass filtering technology. The low-pass filtering technology uses a fifth-order Butterworth filter, and sets the cutoff frequency (such as 5 Hz) to retain the low-frequency signals related to the phase change material state change, while suppressing noise components above the cutoff frequency. The electrical conductivity data after low-pass filtering forms a continuous time series, i.e. electrical conductivity time series data, which has smooth waveform and clear mutation points, and can accurately reflect the transition characteristics of the phase change material from solid state to liquid state or mixed state. The electrical conductivity time series data is truncated into independent data segments according to a fixed time window; The electrical conductivity time series data is processed in segments, and the continuous electrical conductivity time series data is divided into independent data segments that do not overlap each other using a fixed time window. 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 realized by extracting the electrical conductivity time series data in segments; The independent data segments are subjected to fast Fourier transform, and frequency domain signals are outputted; 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, outputs a frequency-domain signal containing frequency values and corresponding amplitude values, and generates 500 frequency points for a data segment containing 1000 sampling points, with each frequency point corresponding to an amplitude value. Each frequency point in the frequency-domain signal exists in the form of a complex number, with the real part and the imaginary part corresponding to the cosine component and the sine component of the frequency component in the frequency-domain signal, respectively. The frequency value of each frequency point in the frequency-domain signal is extracted, and the real part and the imaginary part of each frequency-domain signal are subjected to square root operation to generate the frequency point amplitude value. Each frequency point in the frequency-domain signal is analyzed to obtain the corresponding frequency value of each frequency point, and the real part value and the imaginary part value of the frequency point are extracted. Through square root operation, the frequency point amplitude value of the frequency point is calculated. The higher the frequency point amplitude value, the more significant the correlation between the frequency value and the state change of the phase change material. The frequency point amplitude value formula is ; wherein, represents the frequency point index identifier, represents the frequency point amplitude value of the th frequency point, represents the real part value of the frequency point, represents the imaginary part value of the frequency point; The frequency values are arranged in ascending order, and a two-dimensional chart is drawn according to the arranged frequency values and the frequency point amplitude values to output a frequency spectrum distribution graph. The frequency values of all frequency points are arranged in ascending order, and the corresponding frequency point amplitude values are mapped to the same coordinate system. The frequency spectrum distribution graph is drawn by taking the frequency value as the horizontal axis and the frequency point amplitude value as the vertical axis in the form of a two-dimensional chart. The frequency spectrum distribution graph directly presents the energy distribution of each frequency component in the conductivity signal. The energy concentration area corresponds to the characteristic frequency range of the state change of the phase change material. The characteristic frequency range that reflects the state change and has energy concentration is selected from the frequency spectrum distribution graph. Based on the area in the frequency spectrum distribution graph where the energy density is significantly higher than the background noise, the frequency range with energy concentration is selected. Combined with the physical law of the conductivity characteristics of the phase change material in the conversion process from solid state, mixed state to liquid state, the characteristic frequency range related to the state change is determined. The selection process needs to exclude false energy peaks caused by environmental interference or errors of the FiSens FBG sensor array to ensure that the characteristic frequency range strictly corresponds to the state evolution process of the phase change material. The frequency point amplitudes in the feature frequency range are extracted, and the frequency point amplitudes are integrated to generate an amplitude distribution matrix; All frequency point amplitudes in the feature frequency range are extracted from the frequency spectrum distribution diagram, the frequency point amplitudes are arranged in frequency order to form a one-dimensional array, and the one-dimensional array is expanded into a two-dimensional amplitude distribution matrix through matrix processing; According to the state characteristics of the phase change material, a frequency spectrum component threshold is set, the amplitude distribution matrix is compared with the frequency spectrum component threshold, and the phase change material state is judged; According to the frequency domain response characteristics of the electrical conductivity of the phase change material in the solid state, the mixed state and the liquid state, the frequency spectrum component thresholds corresponding to different states are set. The setting of the frequency spectrum component threshold needs to comprehensively consider the thermodynamic parameters, the electrical conductivity baseline value and the environmental working conditions of the phase change material, so as to ensure that the frequency spectrum component threshold range can accurately distinguish the frequency spectrum characteristics of different states. By comparing each frequency point amplitude in the amplitude distribution matrix with the frequency spectrum component threshold point by point, it is judged whether the phase change material is currently in the solid state, the mixed state or the liquid state, thereby providing a decision basis for the heat source switching of the dual-source heat pump building integrated energy supply system.

[0027] S2, according to the phase change material state, triggering the adjustment instruction of the dual-source heat pump, according to the adjustment instruction, adjusting the valve of the dual-source heat pump, and outputting the energy supply mode of the dual-source heat pump.

[0028] According to any one of the solid state, the mixed state and the liquid state of the phase change material, matching the adjustment instruction of the dual-source heat pump; Specifically, the generation of the adjustment instruction depends on the phase change material state-valve response mapping rule, which is established through historical operation data and the phase change material state change rule, to ensure the pertinence and effectiveness of the adjustment instruction in different states. After matching, the adjustment instruction is stored in a structured data form, including the valve adjustment target value, the energy supply mode name and the execution priority, to provide a basis for subsequent transmission and execution; The adjustment instruction is transmitted to the dual-source heat pump control center to trigger the valve adjustment signal of the air source heat pump and the solar heat pump; The adjustment instruction is transmitted to the dual-source heat pump control center through the communication link, the adjustment target value of the air source evaporation circuit valve and the solar direct expansion circuit valve and the energy supply mode identifier are extracted, the dual-source heat pump control center receives the adjustment instruction, generates the corresponding valve adjustment signal according to the adjustment target value in the adjustment instruction, the valve adjustment signal contains the opening control instruction of the air source evaporation circuit valve and the opening control instruction of the solar direct expansion circuit valve, and 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 coding rule, which is 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 in the transmission process. Adjusting the air source evaporation circuit valve and the solar direct expansion circuit valve according to the valve adjustment signal, and labeling the energy supply mode for the adjusted air source evaporation circuit valve and the solar direct expansion circuit valve; After receiving the valve adjustment signal, the air source evaporation circuit valve adjusts its opening degree to the target value according to the opening control instruction in the valve adjustment signal, and the adjustment process is realized through step-by-step driving or proportional control to ensure that the opening degree change meets the requirements of the opening control instruction. After receiving the valve adjustment signal, the solar direct expansion circuit valve adjusts its opening degree to the target value according to the opening control instruction in the signal, and the adjustment process is also realized through step-by-step driving or proportional control to ensure that the opening degree change is coordinated with the adjustment of the air source evaporation circuit valve; After the adjustment is completed, the state information of the air source evaporation circuit valve and the solar direct expansion circuit valve is returned to the control center through the feedback channel. The state information includes the current opening degree value and the completion status of the adjustment. According to the energy supply mode identification in the valve adjustment signal, the control center assigns the corresponding energy supply mode name to the adjusted air source evaporation circuit valve and the solar direct expansion circuit valve, and writes the energy supply mode name into the valve state record as the basis for subsequent energy supply mode output. Finally, the adjustment results of the air source evaporation circuit valve and the solar direct expansion circuit valve and the energy supply mode identification together constitute the current energy supply mode of the dual-source heat pump.

[0029] S3, matching the evaporation reference value for different dual-source heat pump energy supply modes, monitoring the outlet evaporation temperature of the evaporator, calculating the reference deviation of the outlet evaporation temperature and the evaporation reference value through the difference method, and adjusting the compressor frequency according to the reference deviation to generate a variable frequency driving signal.

[0030] Matching the evaporation reference value corresponding to the energy supply mode from the preset evaporation reference value table; Specifically, the evaporation reference value table is preset according to the operating conditions of the dual-source heat pump building comprehensive energy supply system (such as energy supply mode and heat load demand) and the performance characteristics of the heat pump equipment (such as evaporator design parameters and compressor efficiency curve), and combined with the safety boundaries (such as preventing frosting or overheating) and energy efficiency optimization targets (such as minimizing energy consumption or maximizing heating capacity) in actual application. The evaporation reference value table takes the energy supply mode name as the index field, associates the evaporation reference value range corresponding to different energy supply modes, and when receiving the energy supply mode identification, accurately matches in the evaporation reference value table according to the energy supply mode identification, extracts the corresponding evaporation reference value range, and takes the middle value or boundary value of the evaporation reference value range as the evaporation reference value of the current energy supply mode; The temperature sensor monitors the outlet evaporation temperature of the evaporator in real time, and calculates the reference deviation of the outlet evaporation temperature and the evaporation reference value through the difference method; The temperature sensor is installed at the evaporator outlet pipe position, and the outlet evaporating temperature is collected through an analog signal or a digital signal, with a fixed time interval (e.g., sampling once every 1 second). The sampled outlet evaporating temperature is transmitted to the control center through a communication link. After the control center receives the outlet evaporating temperature, the outlet evaporating temperature is subtracted from the evaporating reference value. If the result is positive, it indicates that the outlet temperature is higher than the reference value. If the result is negative, it indicates that the outlet temperature is lower than the reference value. The difference is calculated using floating-point arithmetic to ensure calculation accuracy. After the calculation is completed, the reference deviation is stored in the control center as a temporary variable in numerical form, serving as an input parameter for subsequent compressor frequency adjustment. The reference deviation formula is, ; Wherein, represents the reference deviation of the outlet evaporating temperature and the evaporating reference value, represents the outlet evaporating temperature of the evaporator, represents the evaporating reference value. The compressor frequency is adjusted according to the size and direction of the reference deviation, a frequency change amount is generated, and the frequency change amount is converted into a variable frequency drive signal. According to the numerical range of the reference deviation, the adjustment interval is divided. 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 amplitude is ±5%. When the absolute value of the reference deviation is greater than 3℃, the adjustment amplitude is ±10%. The adjustment direction is determined by the sign of the reference deviation (positive for frequency reduction, negative for frequency increase). The corresponding frequency change amount (e.g., +5% or -10%) is generated. The frequency change amount is expressed in percentage form. The generated frequency change amount is superimposed on the current compressor operating frequency to obtain a target frequency value. The target frequency value is converted into an analog signal through a variable frequency drive signal conversion rule (e.g., mapping 0%~100% frequency range to 0V~10V voltage signal). The analog signal is sent to the variable frequency drive of the compressor through the output interface, and the compressor operating frequency is adjusted to the target value.

[0031] 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 shunting.

[0032] The variable frequency drive signal is input into 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. Specifically, the variable frequency drive signal is sent to the compressor's variable frequency driver 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 driver converts the analog voltage signal into a digital control command, drives the compressor motor to rotate, and the compressor motor speed is proportional to the target frequency value. The frequency increases corresponding to the speed increase, and the frequency decreases corresponding to the speed decrease. The variable frequency driver monitors the actual output frequency through a real-time feedback loop to ensure that the output frequency is consistent with the target frequency value. Adjust the electronic expansion valve opening degree according to the real-time monitored evaporator outlet evaporation temperature; Adjust the electronic expansion valve opening degree according to the reference deviation obtained from the real-time monitored evaporator outlet evaporation temperature. The reference deviation generates the opening degree adjustment command of the electronic expansion valve through the set opening degree adjustment rule (such as positive deviation corresponding to reduced opening degree, negative deviation corresponding to increased opening degree). The opening degree adjustment command is expressed in percentage form (such as +5% or -10%). After receiving the opening degree adjustment command, the electronic expansion valve adjusts the valve core opening degree according to the command value of the opening degree adjustment command. The opening degree change directly affects the refrigerant flow. During the adjustment process, the control logic of the electronic expansion valve follows a closed-loop feedback mechanism to ensure that the actual opening degree is consistent with the target opening degree by real-time monitoring of the valve core position feedback signal. After completing the dynamic adjustment of the running frequency and the electronic expansion valve opening degree, monitor the evaporator inlet pressure and the evaporator outlet pressure at fixed time intervals to obtain the instantaneous pressure difference between the evaporator inlet and outlet. The pressure sensor is installed in the evaporator inlet and outlet pipes to collect pressure data through analog or digital signals. The sampling period is a fixed time interval (such as every 2 seconds). The sampled pressure data is transmitted through a communication link and stored as inlet pressure and outlet pressure values. The inlet pressure and outlet pressure values are compared to obtain the instantaneous pressure difference between the evaporator inlet and outlet. During the monitoring process, the sampling period of the pressure sensor is synchronized with the compressor frequency adjustment period to ensure data timestamp consistency. Compare the instantaneous pressure difference of the current fixed time interval with that of the adjacent fixed time interval to determine whether bypass valve shunting is needed. By comparing the instantaneous pressure difference value of the current fixed time interval with that of the adjacent fixed time interval, if the instantaneous pressure difference value exceeds the pressure difference threshold (such as ±10kPa), it indicates that the evaporator pressure difference fluctuates violently, and the bypass valve shunting needs to be triggered. If the instantaneous pressure difference value does not exceed the pressure difference threshold (such as ±10kPa), it indicates that the evaporator pressure difference fluctuates normally, and the bypass valve shunting does not need to be triggered. The setting of the pressure difference threshold needs to be based on the physical characteristics of the equipment (such as evaporator design pressure range, material pressure capacity), historical operation data (such as pressure difference fluctuation range under normal working conditions), safety boundaries (such as minimum / maximum allowable deviation to prevent equipment overload or damage), and manufacturer's technical specifications.

[0033] S5、in the bypass valve shunt activation heat recovery channel, the bypass valve shunt generated heat energy into the heat recovery channel of the phase change material energy storage area, complete energy recovery and energy supply control.

[0034] After the bypass valve shunt is started, the valve assembly of the heat recovery channel is sent an activation instruction to open the inlet valve and outlet valve of the heat recovery channel to generate a heat energy transmission path. Specifically, when the bypass valve shunt is started, an activation instruction is sent to the valve assembly of the heat recovery channel through a digital signal output interface. The activation instruction content includes the opening command of the inlet valve and outlet valve. After receiving the activation instruction, the valve assembly sequentially opens (such as opening the inlet valve first and then opening 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, and the heat energy transmission path is generated depending on the accurate control of the valve opening degree. After the heat energy transmission path is generated, the inlet and outlet of the heat recovery channel form a stable fluid channel, providing a basic condition for the subsequent transmission of high-temperature working medium. High-temperature working medium is generated during the bypass valve shunt process, which is introduced into the heat recovery channel through the heat energy transmission path and exchanges heat with the circulating heat exchange medium, and the heat exchange medium carries heat into the phase change material energy storage area. During the bypass valve shunt operation, part of the refrigerant flows through the bypass path to form high-temperature working medium (such as temperature higher than the evaporator outlet temperature), and the high-temperature working medium enters the heat recovery channel through the heat energy transmission path. The pre-set heat exchange medium (such as water or antifreeze) in the heat recovery channel circulates at a fixed flow rate. The heat exchange medium and the high-temperature working medium exchange heat in the heat exchange section (such as a plate heat exchanger or a tube-in-shell heat exchanger) of the heat recovery channel. Heat exchange follows Fourier's law (heat conduction rate is proportional to temperature difference). The temperature of the heat exchange medium rises after absorbing the sensible heat of the high-temperature working medium. The heated heat exchange medium enters the phase change material energy storage area through the outlet pipeline. 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, ensuring the continuity of heat transfer. The phase change material in the phase change material energy storage area absorbs the heat energy of the heat exchange medium through heat conduction and stores the heat energy as latent heat. The heat energy carried by the heat exchange medium is transmitted to the phase change material through the contact surface (such as metal fins or direct contact) after the heat exchange medium enters the phase change material energy storage area. The phase change material absorbs the heat energy of the heat exchange medium in the solid-liquid phase change process, and the absorbed heat energy is stored in the form of latent heat. The heat transfer efficiency of the phase change material depends on the material properties (such as thermal conductivity, phase change temperature range) and the structural design of the energy storage area (such as filling density, heat exchange area). During the energy storage process, the state of the phase change material gradually changes from solid to liquid, or remains 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 degree of latent heat storage is determined by the phase change progress of the phase change material (such as the proportion of liquid) and the heat balance state of the energy storage area. Real-time monitoring of the energy storage state of the phase change material energy storage area latent heat, and determining whether the energy storage state meets the standard; Real-time monitoring of the dynamic parameters of the phase change material energy storage area latent heat storage state, including the temperature distribution of the phase change material, the liquid volume proportion, and the inlet and outlet temperature difference of the heat exchange medium. The evaluation of the energy storage state is based on the dynamic absorption characteristics of the phase change material to heat energy. The uniformity of the temperature distribution of the phase change material, the stability of the liquid volume proportion, and the degree of stabilization of the inlet and outlet temperature difference of the heat exchange medium are comprehensively judged. When the temperature distribution of the phase change material tends to be uniform and the liquid volume proportion does not change significantly, it indicates that the energy storage process has entered a balanced state, and the energy storage state meets the standard. When the temperature distribution of the phase change material still has a significant gradient, the liquid volume proportion 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 state does not meet the standard. When the energy storage state does not meet the standard, maintain the open state of the inlet and outlet valves of the heat recovery channel; When the energy storage state meets the standard, complete energy recovery and energy supply control by reversing the activation of the heat exchange medium; If the energy storage state does not meet the standard, maintain the open state of the inlet and outlet valves of the heat recovery channel to ensure that the high-temperature working medium continues to flow into the energy storage area, and the heat exchange medium continues to circulate. In the open state, the inlet and outlet valves should maintain the current opening degree to avoid mechanical wear caused by frequent start-stop. If the energy storage state meets the 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. At the same time, the control center sends a reverse activation command to the circulating pump of the heat exchange medium to adjust the flow direction of the heat exchange medium, releasing the stored latent heat to the dual-source heat pump building energy supply demand area (such as the heating circuit or hot water storage tank) through the heat exchange medium. The energy recovery process realizes the directional transfer of heat energy through the reverse flow of the heat exchange medium. The energy supply control effect is verified by the output temperature or heat supply of the dual-source heat pump building comprehensive energy supply system. After the reverse activation is completed, the heat recovery channel enters a standby state, the valve opening degree and the flow direction of the heat exchange medium return to the initial settings, preparing for the next energy storage cycle.

[0035] The embodiment also provides a control system of the dual-source heat pump building comprehensive energy supply system, comprising: a state module, configured to collect the electric conductivity data, extract a characteristic frequency component of the electric conductivity data, and determine the phase change material state through the characteristic frequency component; a mode module, configured to trigger an adjustment instruction of the dual-source heat pump according to the phase change material state, perform valve adjustment of the dual-source heat pump according to the adjustment instruction, and output a dual-source heat pump energy supply mode; a signal module, configured to match an evaporation reference value for different dual-source heat pump energy supply modes, monitor an outlet evaporation temperature of the evaporator, calculate a reference deviation of the outlet evaporation temperature and the evaporation reference value through a difference method, adjust a compressor frequency according to the reference deviation, and generate a variable frequency driving signal; a shunt module, configured to dynamically adjust the compressor frequency and an electronic expansion valve opening degree according to the variable frequency driving signal, monitor an inlet and outlet pressure difference of the evaporator after adjustment, and determine whether to perform bypass valve shunting; a regulation and control module, configured to activate a heat recovery channel in the bypass valve shunting, guide heat energy generated by the bypass valve shunting into a phase change material energy storage area of the heat recovery channel, and complete energy recovery and energy supply regulation and control.

[0036] The embodiment also provides a computer device suitable for the control method of the dual-source heat pump building comprehensive energy supply system, comprising a memory and a processor; the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions to implement the control method of the dual-source heat pump building comprehensive energy supply system proposed in the above embodiment.

[0037] The computer device can be a terminal, and the computer device comprises a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals. The wireless communication can be achieved through WIFI, operator network, NFC (near field communication) or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device. In addition, the input device can be an external keyboard, touchpad or mouse, etc.

[0038] The embodiment also provides a storage medium having a computer program stored thereon, the program being executed by a processor to implement the control method for realizing the dual-source heat pump building comprehensive energy supply system as proposed in the above embodiment; the storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory, a magnetic disk, or an optical disk.

[0039] To sum up, by the synergy of the conductivity characteristic frequency analysis and the dynamic activation of the heat recovery channel, the present application realizes the accurate discrimination of the phase change material state and the closed-loop regulation of the energy flow. The collection of the conductivity data and the extraction of the characteristic frequency component make the frequency domain response difference of the phase change material in different states be quantitatively identified, which improves the sensitivity and stability of the state judgment. After the specific phase change state is determined, the dual-source heat pump energy supply mode is triggered to switch, which ensures the real-time matching of the energy supply strategy and the energy storage state. In the bypass valve shunting, the heat recovery channel is activated, which leads the originally wasted heat energy into the phase change material energy storage area. Not only the immediate conversion and storage of the energy recovery are realized, but also the adaptability of the dual-source heat pump building comprehensive energy supply system to the load fluctuation is enhanced.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all of them should be covered in the scope of the claims of the present application.

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 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 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.

3. The control method for the dual-source heat pump building integrated energy supply system as described in claim 2, 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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 7, 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.

9. 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 7.

10. 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 7.

Images