A peak-valley electricity and load depth matching operation control method of air source heat pump coupled with cold and heat storage

Abstract

The application discloses a peak-valley electricity and load deep matching operation control method of an air source heat pump coupled with cold and heat storage, and comprises the following steps: collecting environmental data through a sensor system, inputting the collected environmental data into a load matching calculation model for calculation, and obtaining real-time cooling and heating loads of a building; adjusting the operation frequency of an air source heat pump coupled with cold and heat storage system according to the obtained real-time cooling and heating loads of the building; and adjusting the operation mode of the air source heat pump coupled with cold and heat storage system according to the peak-valley electricity time period after the adjustment is completed, so as to realize deep matching between system operation and the peak-valley electricity time period. Through the load matching calculation model, relevant load prediction results are obtained, the operation frequency of the air source heat pump unit is adjusted in combination with the return water temperature and the average indoor temperature, the control method of load matching is formed, precise heating or refrigeration is realized, the operation mode of the system is adjusted according to the peak-valley time period, and the effect of deep matching between system operation and the peak-valley time period is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of energy-saving application, and in particular to a peak-valley electricity and load deep matching operation control method for an air source heat pump coupled with cold and heat storage. BACKGROUND

[0002] A heat pump is a high-efficiency energy conversion device, which can effectively solve the heat demand in production and life and improve energy utilization efficiency by converting low-grade heat into high-grade heat through consumption of a small amount of electricity, is a green and low-carbon heat supply mode, and has significant energy-saving and environmental protection characteristics. The annual sales of the heat pump industry have exceeded 30 billion yuan, most of which are air source heat pump products. Air source heat pumps are widely used in building cooling and heating, domestic hot water, industrial and agricultural heat and other fields, and are particularly widely used in the field of building cooling and heating.

[0003] Due to the load variation of the power system, the peak-valley electricity period is set to alleviate the contradiction between power supply and demand, improve the power grid load rate and equipment utilization rate, and achieve the purpose of controlling peak load, fully utilizing low-valley electricity and improving social and economic benefits. A common form of utilizing the price difference between peak-valley electricity is to use electric heating to heat the phase change heat storage material in the valley electricity period, or to use a water chiller to cool the cold storage material, and to release heat or cold in the peak electricity period. However, the heating efficiency of the electric heating mode is low, the electric heating efficiency is less than 100%, the power load is large, and only electricity charges can be saved, but energy saving cannot be achieved. The cold storage mode using a water chiller increases the investment of the system. Moreover, in the process of air source heat pump providing heating and cooling for buildings, the return water temperature is usually used as the main basis for judging the operation of the unit, which is relatively single.

[0004] Therefore, it is urgent to design an air source heat pump system with high efficiency and stability and a reasonable control method, so that the system can not only meet the needs of building cooling and heating, but also deeply match the peak-valley electricity period, so that the unit can be reasonably and intelligently operated, and the electric energy and operation cost can be saved. SUMMARY

[0005] In order to solve the above technical problems, the application provides the following technical solutions:

[0006] The embodiment of the application provides a peak-valley electricity and load deep matching operation control method for an air source heat pump coupled with cold and heat storage, which comprises the following steps:

[0007] The environment data collected by the sensor system is input into a load matching calculation model for calculation to obtain the real-time cooling and heating load of the building;

[0008] The operation frequency of the air source heat pump coupled with cold and heat storage system is adjusted according to the obtained real-time cooling and heating load of the building;

[0009] After the adjustment, the operation mode of the air source heat pump coupled cold and heat storage system is adjusted according to the peak and valley electricity period of the power grid, so as to realize deep matching between the system operation and the peak and valley electricity period of the power grid.

[0010] In a possible implementation, the load matching calculation model comprises a heating load matching calculation model and a cooling load matching calculation model, wherein the heating load matching calculation model is:

[0011]

[0012] wherein, is an outdoor average temperature in a certain period, is a heating indoor design temperature, is a heating outdoor calculation temperature, is a real-time heating load, is a building heat load corresponding to the heating outdoor calculation temperature.

[0013] In a possible implementation, the cooling load matching calculation model is:

[0014]

[0015]

[0016] wherein, is a real-time refrigeration load, is a building cold load corresponding to a refrigeration air conditioning outdoor calculation temperature, is a refrigeration indoor design temperature, is a refrigeration outdoor calculation temperature, is a parameter related to an ambient temperature, an indoor temperature and an air conditioning load outdoor calculation temperature, is a coefficient related to solar radiation, is a proportion of heat transferred by an envelope structure, is a proportion of radiation heat entering a transparent envelope structure, is a proportion of human body heat dissipation, is a proportion of lighting heat dissipation, is a proportion of heat dissipation of internal heat sources of equipment and appliances, is a proportion of heat brought by permeated air, is a proportion of material heat dissipation, is a proportion of latent heat in a moisture dissipation process.

[0017] In a possible implementation, the air source heat pump coupled cold and heat storage system comprises an intermediate buffer water tank, an air source heat pump unit connected in parallel with the intermediate buffer water tank, a phase change heat storage module, a phase change cold storage module, and a fan coil, the phase change heat storage module is provided with a heat storage circulating pump and a heat storage electromagnetic valve between the phase change heat storage module and the intermediate buffer water tank, the phase change cold storage module is provided with a cold storage circulating pump and a cold storage electromagnetic valve between the phase change cold storage module and the intermediate buffer water tank, the fan coil is provided with a heating and cooling circulating pump and an expansion tank between the fan coil and the intermediate buffer water tank, the air source heat pump unit is provided with an air source heat pump circulating pump between the air source heat pump unit and the intermediate buffer water tank, and the heat storage circulating pump, the cold storage circulating pump, the heating and cooling circulating pump, the air source heat pump circulating pump, the heat storage electromagnetic valve, the cold storage electromagnetic valve, and the air source heat pump unit are electrically connected with a controller, and the controller is electrically connected with a sensor system.

[0018] In a possible implementation, the operation frequency of the air source heat pump coupled cold and heat storage system is adjusted according to the obtained real-time cooling and heating load of the building, comprising:

[0019] The obtained real-time cooling and heating load of the building is judged, if the obtained real-time heating load of the building is compared with the design load to obtain a first load proportionality coefficient;

[0020] The operation frequency of the heating and cooling circulating pump is adjusted according to the first load proportionality coefficient;

[0021] After the adjustment is completed, the parameters of the air source heat pump unit and the operation frequency of the heat storage circulating pump are controlled according to the return water temperature and the average indoor temperature;

[0022] Or,

[0023] If the obtained real-time cooling load of the building is compared with the design load to obtain a second load proportionality coefficient;

[0024] The operation frequency of the heating and cooling circulating pump is adjusted according to the second load proportionality coefficient;

[0025] After the adjustment is completed, the parameters of the air source heat pump unit and the operation frequency of the cold storage circulating pump are controlled according to the return water temperature and the average indoor temperature.

[0026] In a possible implementation, the parameters of the air source heat pump unit and the operation frequency of the heat storage circulating pump are controlled according to the return water temperature and the average indoor temperature, comprising:

[0027] When the return water temperature is less than a preset temperature or the average indoor temperature is lower than a set temperature, the process of the air source heat pump unit is determined;

[0028] If the air source heat pump unit is in the heating process, the frequency of the air source heat pump circulating pump is increased;

[0029] If the air source heat pump unit is in the heat release process, the frequency of the heat storage circulating pump is increased;

[0030] If the air source heat pump unit is in the heating and heat storage process, the operating parameters of the air source heat pump circulating pump remain unchanged, the frequency of the heating and cooling circulating pump is reduced, and the end heating effect is ensured;

[0031] Or,

[0032] When the return water temperature is greater than the preset temperature and the indoor average temperature reaches the set temperature, if the air source heat pump unit is in the heating process, the frequency of the air source heat pump circulating pump is reduced;

[0033] If the air source heat pump unit is in the heat release process, the frequency of the heat storage circulating pump is reduced;

[0034] If the air source heat pump unit is in the heating and heat storage process, the operating parameters of the air source heat pump circulating pump remain unchanged, the frequency of the heating and cooling circulating pump is reduced, and the end heating effect is ensured;

[0035] In a possible implementation, the method comprises:

[0036] When the return water temperature is greater than the preset temperature or the indoor average temperature is higher than the set temperature, if the air source heat pump unit is in the cooling process, the frequency of the air source heat pump circulating pump is increased;

[0037] If the air source heat pump unit is in the cooling process, the frequency of the heat storage circulating pump is increased;

[0038] If the air source heat pump unit is in the cooling and heat storage process, the operating frequency of the air source heat pump circulating pump remains unchanged, and the frequency of the heating and cooling circulating pump is increased, so as to ensure the end cooling effect;

[0039] Or;

[0040] When the return water temperature is less than the set temperature and the indoor average temperature reaches the set temperature, if the air source heat pump unit is in the cooling process, the frequency of the air source heat pump circulating pump is reduced;

[0041] If the air source heat pump unit is in the cooling process, the frequency of the heat storage circulating pump is reduced;

[0042] If the air source heat pump unit is in the cooling and heat storage process, the operating frequency of the air source heat pump circulating pump remains unchanged, and the frequency of the heat storage circulating pump is reduced, otherwise the operating parameters remain unchanged.

[0043] In a possible implementation, the operation mode of the air source heat pump coupled cold and heat storage system is adjusted according to the peak-valley electricity period of the power grid to realize deep matching between system operation and the peak-valley electricity period of the power grid, and the operation mode comprises the following steps:

[0044] If the current month is in the heating season and the peak-valley electricity period is in the valley period of the power grid, the operation mode of the air source heat pump coupled cold and heat storage system is adjusted to the air source heat pump unit heating and heat storage mode, the air source heat pump unit is started to heat, and the heat storage circulating pump and the heat storage electromagnetic valve are started to heat the phase change heat storage module.

[0045] If the current month is in the heating season and the peak-valley electricity period is in the peak period of the power grid, the air source heat pump coupled cold and heat storage system is switched to the heat release mode, the air source heat pump unit and the air source heat pump circulating pump are in standby state, and the energy of the phase change heat storage module is preferentially released.

[0046] If the current month is in the heating season and the peak-valley electricity period is in the flat period of the power grid, the air source heat pump coupled cold and heat storage system is switched according to the energy storage state of the phase change heat storage module, the heat release mode is maintained if the phase change heat storage module meets the heat release condition, or the air source heat pump heating is switched if not.

[0047] Or, if the current month is in the cooling season and the peak-valley electricity period is in the valley period of the power grid, the operation mode of the air source heat pump coupled cold and heat storage system is adjusted to the air source heat pump unit cooling and cold storage mode, the air source heat pump unit is started to cool, and the cold storage circulating pump and the cold storage electromagnetic valve are started to cool the phase change cold storage module.

[0048] If the current month is in the cooling season and the peak-valley electricity period is in the peak period of the power grid, the air source heat pump coupled cold and heat storage system is switched to the cold release mode, the air source heat pump unit and the air source heat pump circulating pump are in standby state, and the energy of the phase change cold storage module is preferentially released.

[0049] If the current month is in the cooling season and the peak-valley electricity period is in the flat period of the power grid, the air source heat pump coupled cold and heat storage system is switched according to the energy storage state of the phase change cold storage module, the cold release mode is maintained if the phase change cold storage module meets the cold release condition, or the air source heat pump cooling is switched if not.

[0050] Compared with the prior art, the application has the following beneficial effects:

[0051] The phase change heat storage module, the phase change cold storage module and the air source heat pump system are coupled in the application, the intermediate buffer water tank is used as a coupling medium, a parallel integrated system is formed, heating, cooling, heat storage, cold storage, heating and cooling are independently operated and do not affect each other, and the system is stable and reliable.

[0052] The application integrates the phase change heat storage module and the phase change cold storage module into the air source heat pump system through the peak-valley electricity and load deep matching operation control method of air source heat pump coupling cold storage and heat storage, obtains the load prediction result related to the operation time and the environment temperature through the load matching calculation model, combines the return water temperature, the average indoor temperature, the operation frequency of the air source heat pump circulating pump, the heat storage and cold storage circulating pump and the heating and cooling circulating pump, forms the control method of load matching, realizes the accurate heating or refrigeration, adjusts the system operation mode according to the peak-valley period of the power grid, achieves the effect of deep matching of system operation and peak-valley period, carries out heat storage or cold storage in the valley period, carries out heat release or cold release in the peak period, can realize the effect of peak load shifting and valley load filling and balancing power supply of the power grid, saves the operation cost of the user by using the price difference of peak-valley electricity, achieves the effect of energy-saving operation of the system, and finally realizes energy saving and emission reduction. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 A flowchart of the peak-valley electricity and load deep matching operation control method of air source heat pump coupling cold storage and heat storage is provided for the embodiment of the application.

[0054] Figure 2 A structure diagram of the air source heat pump coupling cold storage and heat storage system is provided for the embodiment of the application.

[0055] Figure 3 A heating operation matching flowchart is provided for the embodiment of the application.

[0056] Figure 4 A cooling operation matching flowchart is provided for the embodiment of the application.

[0057] Figure 5 A heating operation power grid matching control mode flowchart is provided for the embodiment of the application.

[0058] Figure 6 A cooling operation power grid matching control mode flowchart is provided for the embodiment of the application.

[0059] Figure 2 The symbols are as follows: 1-air source heat pump unit, 2-phase change heat storage module, 3-phase change cold storage module, 4-intermediate buffer water tank, 5-expansion tank, 6-fan coil, 7-air source heat pump circulating pump, 8-heating and cooling circulating pump, 9-heat storage circulating pump, 10-heat storage electromagnetic valve, 11-cold storage circulating pump, 12-cold storage electromagnetic valve, 13-exhaust valve, 14-controller. DETAILED DESCRIPTION

[0060] The present scheme will be described below in combination with the drawings and specific embodiments.

[0061] Figure 1A flowchart of a peak-valley electricity and load depth matching operation control method of an air source heat pump coupled with cold and heat storage is provided for the embodiments of the present application, see Figure 1 The peak-valley electricity and load depth matching operation control method of an air source heat pump coupled with cold and heat storage in the embodiments includes the following steps:

[0062] In S101, the environmental data collected by the sensor system is input into the load matching calculation model for calculation to obtain the real-time cooling and heating load of the building.

[0063] In the embodiments, the environmental data such as the supply water temperature, return water temperature and flow rate of the air source heat pump, the terminal supply water temperature, the terminal return water temperature and flow rate, the intermediate buffer tank temperature, the outdoor temperature, the solar radiation, the temperature of each room in the building, the temperature difference and flow rate of the phase change heat storage module and the phase change cold storage module, etc. are collected by the sensor system. The collected environmental data are input into the load matching calculation model for calculation to obtain the real-time cooling and heating load of the building.

[0064] In the embodiments, the load matching calculation model includes a heating load matching calculation model and a cooling load matching calculation model, wherein the heating load matching calculation model is as follows:

[0065]

[0066] wherein, is the average outdoor temperature in a certain period of time, is the indoor design temperature for heating, generally 18℃ or 20℃, is the outdoor calculation temperature for heating, for example, -5.3℃ in Jinan, is the real-time heating load, is the building heat load corresponding to the outdoor calculation temperature for heating, which is given according to the load calculation method during construction design.

[0067] Since the cooling load has many constituent factors, including the heat transferred by the envelope structure, the radiant heat entering through the transparent envelope structure, the heat dissipated by the human body, the heat dissipated by lighting, the heat dissipated by internal heat sources such as equipment and appliances, the heat brought in by permeable air, the heat dissipated by materials, the latent heat of the dehumidification process, etc., the air conditioning load of a typical building accounts for:

[0068] Office building: solar radiation heat 20%, equipment and appliances 20%, human body heat dissipation 20%, envelope structure 15%, lighting heat dissipation 10%, air permeation 10%, material heat dissipation 5%.

[0069] Shopping mall: human body heat dissipation 25%, equipment 20%, solar radiation heat 15%, lighting heat dissipation 15%, air permeation 15%, material heat dissipation 5%, envelope structure 5%.

[0070] Hotel: 20% of solar radiation heat, 20% of human body heat, 15% of equipment and appliances, 15% of air penetration, 15% of building envelope, 10% of lighting heat dissipation, and 5% of material heat dissipation.

[0071] It can be seen that the proportion of the maintenance structure in the cooling load is small, the influence of the ambient temperature change on the load is small, the proportion of the solar radiation heat is relatively large, and the load changes in the morning, noon, evening and night are mainly caused by the influence of the change of the radiation heat. Therefore, the embodiment of the present application proposes a cooling load matching calculation model as follows:

[0072]

[0073]

[0074] wherein, is the real-time refrigeration load, is the building cooling load corresponding to the refrigeration air conditioning outdoor calculation temperature, is the refrigeration indoor design temperature, is the refrigeration outdoor calculation temperature, is a parameter related to the ambient temperature, indoor temperature, and air conditioning load outdoor calculation temperature, is a coefficient related to solar radiation, according to the change of solar radiation in a day, a normal distribution coefficient between 0~1.0 is taken during 06:00-18:00 in the daytime, and is obtained according to the comparison between the measured solar radiation and the reference radiation, is the proportion of the heat entering the building envelope, is the proportion of the radiation heat entering the transparent building envelope, is the proportion of the human body heat dissipation, is the proportion of the lighting heat dissipation, is the proportion of the heat dissipation of the internal heat source of the equipment and appliances, is the proportion of the heat brought in by the penetrating air, is the proportion of the heat dissipation of the material, is the proportion of the latent heat in the dehumidification process.

[0075] Referring to Figure 2The air source heat pump coupling cold and heat storage system in the embodiment of the application comprises an intermediate buffer water tank 4, and an air source heat pump unit 1, a phase change heat storage module 2, a phase change cold storage module 3 and a fan coil 6 connected in parallel with the intermediate buffer water tank 4, wherein the phase change heat storage module 2 and the intermediate buffer water tank 4 are provided with a heat storage circulating pump 9 and a heat storage electromagnetic valve 10, the phase change cold storage module 3 and the intermediate buffer water tank 4 are provided with a cold storage circulating pump 11 and a cold storage electromagnetic valve 12, the fan coil 6 and the intermediate buffer water tank 4 are provided with a heat and cold supply circulating pump 8 and an expansion tank 5, and the air source heat pump unit 1 and the intermediate buffer water tank 4 are provided with an air source heat pump circulating pump 7, the heat storage circulating pump 9, the cold storage circulating pump 11, the heat and cold supply circulating pump 8, the air source heat pump circulating pump 7, the heat storage electromagnetic valve 10, the cold storage electromagnetic valve 12 and the air source heat pump unit 1 are electrically connected with a controller 14, and the controller 14 is electrically connected with a sensor system.

[0076] In the embodiment, the air source heat pump unit 1 adopts an ultra-low temperature jet augmenting enthalpy type unit, which can meet the application in most areas of China, and can produce hot water for heating in winter and cold water for refrigeration in summer. The phase change temperature of the phase change heat storage module 2 is adjustable at 45℃, the phase change temperature of the phase change cold storage module 3 is adjustable at 10℃, and the fan coil 6 is used at the end, which can be used for heating and refrigeration. The system operates under pressure, and the expansion tank 5 is arranged to absorb the expanded pressure in the system circuit. The controller 14 adopts a PLC controller, calculates the real-time cooling and heating load of the building according to the parameters collected by the sensor system, and sets the operation mode and operation control parameters according to the peak and valley electricity time period of the power grid.

[0077] The operation principle of the air source heat pump coupling cold and heat storage system is as follows: when heating, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are closed. The air source heat pump unit 1 is started in the heating mode, when heat storage is needed, the air source heat pump unit 1, the air source heat pump circulating pump 7, the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are all started to perform air source heat pump heating and heat storage; after the heat storage is completed, the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are closed, the air source heat pump unit 1 continues to operate normally, in the peak electricity time period, the heat of the phase change heat storage module 2 is preferentially used, the system operates in the heat release mode, the air source heat pump unit 1 stops operating, the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are started, the water in the intermediate buffer water tank 4 enters the phase change heat storage module 2 to be heated, and then returns to the intermediate buffer water tank 4, when the heat of the phase change heat storage module 2 is used up, the air source heat pump unit 1 is started to produce heat.

[0078] In the refrigeration operation, the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are closed, the air source heat pump unit 1 is started in the refrigeration mode, when the cold storage is needed, the air source heat pump unit 1, the air source heat pump circulating pump 7, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are all started, the air source heat pump cooling and cold storage are carried out, after the cold storage is completed, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are closed, the air source heat pump unit 1 continues to operate normally, in the peak electricity period, the cold quantity of the phase change cold storage module 3 is preferentially used, the air source heat pump unit 1 stops operating, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are started, the water in the intermediate buffer tank 4 enters the phase change cold storage module 3 to be cooled, and then returns to the intermediate buffer tank 4, and when the cold quantity of the phase change cold storage module 3 is used up, the air source heat pump unit 1 is started to refrigerate.

[0079] In S102, the operation frequency of the air source heat pump coupled cold storage and heat storage system is adjusted according to the obtained real-time cooling and heating load of the building.

[0080] Referring to Figure 3 In the embodiment, the obtained real-time cooling and heating load of the building is judged, if the real-time heating load of the building is obtained, the real-time heating load of the building is compared with the design load to obtain a first load proportionality coefficient, the operation frequency of the heating and cooling circulating pump 8 is adjusted according to the first load proportionality coefficient, the design load corresponds to the rated frequency 50Hz, and the actual frequency is multiplied by the proportionality coefficient, after the adjustment is completed, the parameters of the air source heat pump unit 1 operation and the operation frequency of the heat storage circulating pump 9 are controlled according to the return water temperature and the indoor average temperature. When the return water temperature is less than the set temperature 36℃, or the indoor average temperature is lower than the set temperature 20℃, if the air source heat pump unit 1 is in the heating process, the frequency of the air source heat pump circulating pump 7 is increased, the frequency is selected to be increased by 1-3Hz / min, if the air source heat pump unit 1 is in the heat release process, the frequency of the heat storage circulating pump 9 is increased by 1-3Hz / min, and if the air source heat pump unit 1 is in the heating and heat storage process, the operation parameters of the air source heat pump circulating pump 7 are unchanged, the frequency of the heating and cooling circulating pump 8 is selected to be reduced by 1-3Hz / min, and the terminal heating effect is preferentially ensured.

[0081] When the return water temperature is greater than the set temperature 36℃, and the indoor average temperature reaches the set temperature 20℃, if the air source heat pump unit 1 is in the heating process, the frequency of the air source heat pump circulating pump 7 is reduced, the frequency is selected to be reduced by 1-3Hz / min,

[0082] If the air source heat pump unit 1 is in the heat release process, the frequency of the heat storage circulating pump 9 is reduced by 1-3Hz / min,

[0083] If the air source heat pump unit 1 is in the heating and heat storage process, the air source heat pump circulating pump 7 operating parameters remain unchanged, and the heating and cooling circulating pump 8 frequency is reduced by 1-3 Hz / min, which can be selected, otherwise the operating parameters remain unchanged. During this process, the frequency of the compressor and the fan inside the air source heat pump unit 1, and the opening of the expansion valve, are controlled by the controller 14 of the air source heat pump unit itself according to its established program.

[0084] Referring to Figure 4 If the building real-time cooling load is obtained, the building real-time cooling load is compared with the design cooling load to obtain a second load proportionality coefficient, and the operating frequency of the heating and cooling circulating pump 8 is adjusted according to the second load proportionality coefficient. The design load corresponds to a rated frequency of 50 Hz, and the actual frequency is multiplied by the proportionality coefficient. After the adjustment is completed, the parameters of the air source heat pump unit 1 and the operating frequency of the cold storage circulating pump 11 are controlled according to the return water temperature and the indoor average temperature. In this embodiment, when the return water temperature is greater than the set 17℃ temperature or the indoor average temperature is higher than the set 26℃ temperature, if the air source heat pump unit 1 is in the cooling process, the air source heat pump circulating pump 7 frequency is increased by 1-3 Hz / min, which can be selected, if the air source heat pump unit 1 is in the cooling process, the air source heat pump circulating pump 7 frequency is increased by 1-3 Hz / min, which can be selected, if the air source heat pump unit 1 is in the cooling and cold storage process, the air source heat pump circulating pump 7 operating frequency remains unchanged, and the frequency of the heating and cooling circulating pump 8 is increased by 1-3 Hz / min, which can be selected, to ensure the terminal refrigeration effect. When the return water temperature is less than the set 17℃ temperature, and the indoor average temperature reaches the set 26℃ temperature, if the air source heat pump unit 1 is in the cooling process, the air source heat pump circulating pump 7 frequency is reduced by 1-3 Hz / min, which can be selected, if the air source heat pump unit is in the cooling process, the air source heat pump circulating pump 7 frequency is reduced by 1-3 Hz / min, which can be selected, if the air source heat pump unit 1 is in the cooling and cold storage process, the air source heat pump circulating pump 7 operating frequency remains unchanged, and the frequency of the cold storage circulating pump 11 is reduced by 1-3 Hz / min, which can be selected, otherwise the operating parameters remain unchanged.

[0085] S103, after the adjustment is completed, the air source heat pump coupling cold storage and heat storage system operating mode is adjusted according to the peak and valley electricity period of the power grid, and the system operation is deeply matched with the peak and valley electricity period of the power grid.

[0086] In this embodiment, the current month and the peak valley electricity period are judged. If the current month is in the heating season and the peak valley electricity period is in the valley segment of the power grid, the air source heat pump coupled cold storage heat storage system operating mode is adjusted to the air source heat pump unit heating and heat storage mode, the air source heat pump unit 1 is started to heat, and at the same time, the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are started to heat, and the phase change heat storage module 2 is heat stored. If the current month is in the heating season and the peak valley electricity period is in the peak segment of the power grid, the air source heat pump coupled cold storage heat storage system is switched to the heat release mode, the air source heat pump unit 1 and the air source heat pump circulating pump 7 are in standby state, and the energy of the phase change heat storage module 2 is preferentially released. If the current month is in the heating season and the peak valley electricity period is in the flat segment of the power grid, the switching is carried out according to the energy storage state of the phase change heat storage module 2. If the phase change heat storage module 2 meets the heat release condition, the heat release mode is maintained, otherwise the air source heat pump unit heating is switched.

[0087] If the current month is in the cooling season and the peak valley electricity period is in the valley segment of the power grid, the air source heat pump coupled cold storage heat storage system operating mode is adjusted to the air source heat pump unit cooling and cold storage mode, the air source heat pump unit is started to cool, and at the same time, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are started to cool, and the phase change cold storage module 3 is cold stored. If the current month is in the cooling season and the peak valley electricity period is in the peak segment of the power grid, the air source heat pump coupled cold storage heat storage system is switched to the cold release mode, the air source heat pump unit 1 and the air source heat pump circulating pump 7 are in standby state, and the energy of the phase change cold storage module 3 is preferentially released. If the current month is in the cooling season and the peak valley electricity period is in the flat segment of the power grid, the switching is carried out according to the energy storage state of the phase change cold storage module 3. If the phase change cold storage module 3 meets the cold release condition, the cold release mode is maintained, otherwise the air source heat pump unit cooling is switched.

[0088] Table 1 Shandong power grid peak valley period division

[0089]

[0090] In this embodiment, the peak valley period division table of Shandong power grid in 2025 is selected to illustrate the operation control method. The peak valley period in different months and different time segments within 24 hours per day is set in the control program. The control program judges and selects the operation mode and the corresponding control method according to the current date and time, realizes the deep matching of the peak valley electricity period operation, and flexibly adjusts the system operation. Referring to Figure 5 , the heating operation control method is:

[0091] 07:00-09:00 is the peak period of the power grid. At this time, heat is stored in the phase change thermal storage module 2, and the heat release mode is turned on. The air source heat pump circulation pump 7 reduces the frequency of anti-freeze operation, the air source heat pump unit 1 stops heating and is in standby state, the phase change thermal storage module 2 circulation pump and the heat storage solenoid valve 10 are turned on, and the working fluid in the intermediate buffer water tank 4 enters the phase change thermal storage module 2, is heated to 41°C and returns to the intermediate buffer water tank 4, and the heating and cooling circulation pump 8 circulates the working fluid to the fan coil 6, and then returns to the intermediate buffer water tank 4. The temperature of the intermediate buffer water tank 4 is about 36°C, until the temperature difference between the inlet and outlet of the phase change thermal storage module 2 is lower than 2°C, or the outlet temperature is less than 38°C, or the power grid valley period is reached.

[0092] 09:00-10:00, the power grid is flat. When the phase change thermal storage module 2 still meets the heat release conditions, the heat release mode is maintained and the air source heat pump unit 1 still does not start heating. When the phase change thermal storage module 2 meets the heat release end conditions, that is, the inlet and outlet temperature difference of the phase change thermal storage module 2 is lower than 2°C, or the outlet temperature is lower than 38°C, or the power grid valley is reached, it is switched to the air source heat pump unit heating mode. The air source heat pump circulation pump 7 operates at normal frequency, the air source heat pump unit 1 starts heating at 41°C, the heat storage circulation pump 9 and the heat storage solenoid valve 10 are closed, and the air source heat pump unit 1 directly supplies heat to the intermediate buffer water tank 4.

[0093] From 10:00 to 15:00, during the valley and deep valley sections of the power grid, the air source heat pump unit operates in heating and heat storage mode simultaneously. The air source heat pump unit 1 starts heating at 48°C and supplies heat to the intermediate buffer water tank 4. The heat storage circulation pump 9 and the heat storage solenoid valve 10 are opened, and the circulating working fluid in the intermediate buffer water tank 4 enters the phase change heat storage module 2 and then returns to the intermediate buffer water tank 4 until the inlet and outlet temperature difference is less than 1°C and the outlet temperature is greater than the set value. For example, if the air source heat pump unit heats at 48°C, the set value can be set to 46°C.

[0094] From 15:00 to 16:00, the power grid is flat. When heat storage is not completed, in order to cope with the subsequent long peak period, the heat storage state is continued to be maintained to increase the temperature of the phase change heat storage module 2 as much as possible. When heat storage is completed, the heat storage circulation pump 9 and the heat storage solenoid valve 10 are closed, and the air source heat pump unit 1 continues to supply heat.

[0095] From 16:00 to 21:00, during the peak and peak periods of the power grid, the heat release mode is turned on, the air source heat pump unit 1 and the air source heat pump circulation pump 7 stop heating and are in standby mode; the heat storage circulation pump 9 and the heat storage solenoid valve 10 are turned on, and the working fluid in the intermediate buffer water tank 4 enters the phase change heat storage module 2, and returns to the intermediate buffer water tank 4 after being heated. The heating and cooling circulation pump 8 runs to circulate the working fluid to the fan coil 6, and then returns to the intermediate buffer water tank 4, until the temperature difference between the inlet and outlet of the phase change heat storage module 2 is lower than 2°C, or the outlet temperature of the phase change heat storage module 2 is lower than 38°C, or the peak period of the power grid ends.

[0096] 21:00-24:00, flat section of power grid, when the phase change heat storage module 2 also meets the heat release condition, the heat release state is continued to be kept, when the phase change heat storage module 2 ends heat release, the air source heat pump unit heating mode is switched to, and the air source heat pump unit 1 and the air source heat pump circulating pump 7 are started.

[0097] 00:00-02:00, flat section of power grid, the air source heat pump unit heating mode is kept unchanged, since it is basically in a sleep state at this time, the air source heat pump unit 1 and the heating and cooling circulating pump 8 can appropriately reduce the running frequency, and the indoor temperature is kept from being reduced by more than 2 DEG C, so that energy is saved.

[0098] 02:00-06:00, valley section of power grid, the heat storage mode is switched to, the air source heat pump unit 1 is kept started, the heating temperature is 48 DEG C and can be adjusted, and the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are started.

[0099] 06:00-07:00, flat section of power grid, the heat storage mode is kept, when heat storage is completed and the energy of the phase change heat storage module 2 is sufficient, the heat release mode is entered, otherwise the air source heat pump unit 1 is kept started to heat.

[0100] 07:00-09:00, peak section of power grid, the heat release mode is started, and 24h cyclic operation is formed.

[0101] For a building that is only heated in the daytime, such as an office building, the heating period is set to 08:00-17:00, and the system operation control method in the embodiment is as follows: 07:00-09:00, 09:00-10:00, 10:00-15:00, 15:00-16:00, the operation control methods of these time periods are the same as those described above; 16:00-17:00, peak section of power grid, the heat release mode is started, and the heat release mode control method is used for operation; 17:00-02:00 of the next day, the system is in a standby state, the air source heat pump unit 1 stops heating, and only anti-freezing circulation is performed; the air source heat pump circulating pump 7 and the heating and cooling circulating pump 8 are operated at a reduced frequency according to the anti-freezing circulation condition; 02:00-07:00, valley section of power grid, the heat storage mode is started, the air source heat pump unit 1 is started, the heating temperature is 48 DEG C, the heat storage circulating pump 9 and the heat storage electromagnetic valve 10 are started, and the heating and cooling circulating pump 8 keeps the anti-freezing operation state. 07:00-09:00, peak section of power grid, the heat release mode is used for operation, the air source heat pump unit 1 stops heating, and cyclic heating operation in a day is formed. The heating operation in March and November is controlled according to the same logic as above.

[0102] Referring to Figure 6 , the cooling operation control method is as follows:

[0103] June: 0:00-07:00, power grid flat section, the ambient temperature is relatively low in this period, the air source heat pump unit directly supplies cooling, the air source heat pump unit and the air source heat pump circulating pump are started, the refrigeration temperature is 12℃, the cold water generated by the air source heat pump unit directly enters the intermediate buffer tank, the cold water working medium is circulated to the fan coil end by the heat supply and cooling circulating pump 8, and then returns to the intermediate buffer tank, and the temperature is about 17℃; the cold storage circulating pump and the cold storage electromagnetic valve are closed.

[0104] 07:00-12:00, power grid valley section, enter the cold storage mode, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are started, the air source heat pump unit 1 remains in the refrigeration mode, the refrigeration temperature is adjusted to 7℃, when the temperature difference between the inlet and outlet of the phase change cold storage module 3 is less than 1℃ and the outlet temperature of the phase change cold storage module is less than the set temperature, such as the air source heat pump refrigeration temperature 7℃, the set temperature can be set to 9℃, the cold storage is ended, and the air source heat pump unit 1 supplies cooling, and the refrigeration temperature is adjusted to 12℃.

[0105] 12:00-16:00, power grid flat section, directly supplied by the air source heat pump unit 1, temperature 12℃, cold storage circulating pump 11 and cold storage electromagnetic valve 12 are closed.

[0106] 16:00-23:00, power grid peak section and peak section, open the cold release mode, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are started, the air source heat pump circulating pump 7 is stopped, the air source heat pump unit 1 is stopped and is in standby state; when the temperature difference between the inlet and outlet of the phase change cold storage module 3 is less than 2℃ or the temperature is greater than 20℃, the cold release is ended, and the air source heat pump unit 1 is started to directly supply cooling.

[0107] 23:00-24:00, power grid flat section, when the phase change cold storage module 3 still meets the cold release condition, the cold release is continued, when the cold release technical condition is reached, that is, when the temperature difference between the inlet and outlet of the phase change cold storage module is less than 2℃ or the temperature is greater than 20℃, the cold release is ended, and the air source heat pump unit directly supplies cooling mode is operated, the air source heat pump unit 1 is started, and the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are closed.

[0108] 7-8 months:

[0109] 00:00-06:00, power grid flat section and valley section, the ambient temperature is low at this time, the refrigeration COP is high, the air source heat pump unit supplies cooling while cold storage, the air source heat pump unit 1 and the air source heat pump circulating pump 7, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are started, 7℃ refrigeration operation, until the cold storage end condition is reached.

[0110] 06:00-16:00, power grid flat section, the air source heat pump unit directly supplies cooling, the refrigeration temperature is set to 12℃, the phase change cold storage module 3, the cold storage circulating pump 11 and the cold storage electromagnetic valve 12 are closed.

[0111] 16:00-23:00, peak segment and peak segment of power grid, into the cold mode, air source heat pump unit 1 stops refrigeration operation, in standby state, phase change cold storage module 3, cold storage circulating pump 11 and cold storage electromagnetic valve 12 are opened, the circulating working medium returns to the intermediate buffer tank through the phase change cold storage module 3, until the temperature difference between the inlet and outlet of the phase change cold storage module 3 is less than 2℃, or the temperature is greater than 20℃.

[0112] 23:00-24:00, flat segment of power grid, when the phase change cold storage module 3 still meets the cold release condition, the cold release continues, when the temperature difference between the inlet and outlet of the phase change cold storage module 3 is less than 2℃, or the temperature is greater than 20℃, the cold release ends, and the air source heat pump unit 1 is opened to directly supply cold by the air source heat pump unit.

[0113] 9 months:

[0114] 00:00-10:00, flat segment of power grid, run in air source heat pump unit direct cooling mode, air source heat pump unit 1 and air source heat pump circulating pump 7 are opened, and cold storage circulating pump 11 and cold storage electromagnetic valve 12 are closed.

[0115] 10:00-16:00, valley segment and deep valley segment of power grid, run in cold storage mode, air source heat pump unit 1 and air source heat pump circulating pump 7 are opened, and cold storage circulating pump 11 and cold storage electromagnetic valve 12 are opened.

[0116] 16:00-21:00, peak segment and peak segment of power grid, run in cold release mode, cold storage circulating pump 11 and cold storage electromagnetic valve 12 are opened, and air source heat pump unit 1 and air source heat pump circulating pump 7 are closed.

[0117] 21:00-24:00, flat segment of power grid, run in air source heat pump unit direct cooling mode, air source heat pump unit 1 and air source heat pump circulating pump 7 are opened, and cold storage circulating pump 11 and cold storage electromagnetic valve 12 are closed.

[0118] For buildings that only supply cooling during the day, such as office buildings, the system operation control method is the same as the above method.

[0119] In the embodiments of the application, "multiple" refers to two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Wherein A, B can be singular or plural. The character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0120] It should be noted that, as used in this document, the terms "comprises", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "comprises" does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0121] The foregoing is merely illustrative of the principles of this application and various modifications can be made by those skilled in the art without departing from the scope and spirit of the application. The disclosure resides in the claims hereinafter appended.

Claims

1. A peak-valley electricity and load depth matching operation control method for air source heat pump coupled with cold and heat storage, characterized in that, The air source heat pump coupled cold and heat storage system comprises an intermediate buffer water tank, an air source heat pump unit, a phase change heat storage module, a phase change cold storage module and a fan coil connected in parallel with the intermediate buffer water tank, the phase change heat storage module is provided with a heat storage circulating pump and a heat storage electromagnetic valve between the phase change heat storage module and the intermediate buffer water tank, the phase change cold storage module is provided with a cold storage circulating pump and a cold storage electromagnetic valve between the phase change cold storage module and the intermediate buffer water tank, the fan coil is provided with a heating and cooling circulating pump and an expansion tank between the fan coil and the intermediate buffer water tank, the air source heat pump unit is provided with an air source heat pump circulating pump between the air source heat pump unit and the intermediate buffer water tank, the heat storage circulating pump, the cold storage circulating pump, the heating and cooling circulating pump, the air source heat pump circulating pump, the heat storage electromagnetic valve, the cold storage electromagnetic valve and the air source heat pump unit are electrically connected with a controller, and the controller is electrically connected with a sensor system; the intermediate buffer water tank is used as a coupling medium to form a parallel integrated system, so that heating, cooling, heat storage, cold storage, heating and cooling are independently operated respectively. The control method comprises: The environmental data collected by the sensor system is input into a load matching calculation model for calculation to obtain the real-time cooling and heating load of the building; The operation frequency of the air source heat pump coupled cold and heat storage system is adjusted according to the obtained real-time cooling and heating load of the building, comprising: The obtained real-time cooling and heating load of the building is judged, if the obtained is the real-time heating load of the building, the real-time heating load of the building is compared with the design load to obtain a first load proportion coefficient; The operation frequency of the heating and cooling circulating pump is adjusted according to the first load proportion coefficient; After the adjustment is completed, the parameters of the air source heat pump unit and the operation frequency of the heat storage circulating pump are controlled according to the return water temperature and the average indoor temperature, comprising: When the return water temperature is less than the preset temperature or the average indoor temperature is lower than the set temperature, the process of the air source heat pump unit is determined; If the air source heat pump unit is in the heating process, the frequency of the air source heat pump circulating pump is increased; If the air source heat pump unit is in the heat release process, the frequency of the heat storage circulating pump is increased; If the air source heat pump unit is in the heating and heat storage process, the operation parameters of the air source heat pump circulating pump are unchanged, the frequency of the heating and cooling circulating pump is reduced, and the end heating effect is ensured; After the adjustment is completed, the operation mode of the air source heat pump coupled cold and heat storage system is adjusted according to the peak and valley electricity time period of the power grid to realize the deep matching of the system operation and the peak and valley electricity time period of the power grid.

2. The peak-valley electricity and load depth matching operation control method of the air source heat pump coupled with cold and heat storage according to claim 1, characterized in that, The load matching calculation model comprises a heating load matching calculation model and a cooling load matching calculation model, wherein the heating load matching calculation model is: wherein, is an outdoor average temperature for a certain period, is a heating indoor design temperature, is a heating outdoor calculation temperature, is a real-time heating load, is a building heat load corresponding to the heating outdoor calculation temperature.

3. The peak-valley electricity and load depth matching operation control method of the air source heat pump coupled with cold and heat storage according to claim 2, characterized in that, The cooling load matching calculation model is: wherein, is the real-time refrigeration load, is the building cooling load corresponding to the refrigeration air conditioning outdoor calculation temperature, is the refrigeration indoor design temperature, is the refrigeration outdoor calculation temperature, is a parameter related to the ambient temperature, indoor temperature, and air conditioning load outdoor calculation temperature, is a coefficient related to solar radiation, is the proportion of heat entering the envelope, is the proportion of radiant heat entering the transparent envelope, is the proportion of human body heat dissipation, is the proportion of lighting heat dissipation, is the proportion of internal heat source dissipation of equipment and appliances, is the proportion of heat brought in by permeable air, is the proportion of material heat dissipation, is the proportion of latent heat in the dehumidification process.

4. The peak-valley electricity and load depth matching operation control method of air source heat pump coupled with cold and heat storage according to claim 1, characterized in that, The operation frequency of the air source heat pump coupled cold and heat storage system is adjusted according to the obtained real-time cooling and heating load of the building, comprising: The obtained real-time cooling and heating load of the building is judged, if the obtained is the real-time cooling load of the building, the real-time cooling load of the building is compared with the design load to obtain a second load proportion coefficient; The operation frequency of the heating and cooling circulating pump is adjusted according to the second load proportion coefficient; After the adjustment, the parameters of the air source heat pump unit and the running frequency of the cold storage circulating pump are controlled according to the return water temperature and the indoor average temperature, including: When the return water temperature is greater than the set temperature or the indoor average temperature is higher than the set temperature, if the air source heat pump unit is in the cooling process, the air source heat pump circulating pump frequency is increased; If the air source heat pump unit is in the cooling process, the frequency of the cold storage circulating pump is increased; If the air source heat pump unit is in the cooling and cold storage process, the air source heat pump circulating pump frequency is unchanged, the frequency of the heating and cooling circulating pump is increased, and the terminal refrigeration effect is ensured; When the return water temperature is less than the set temperature, and the indoor average temperature reaches the set temperature, if the air source heat pump unit is in the cooling process, the frequency of the air source heat pump circulating pump is reduced; If the air source heat pump unit is in the cooling process, the frequency of the cold storage circulating pump is reduced; If the air source heat pump unit is in the cooling and cold storage process, the air source heat pump circulating pump frequency is unchanged, the frequency of the cold storage circulating pump is reduced, otherwise the running parameters are unchanged.

5. The peak-valley electricity and load depth matching operation control method of air source heat pump coupled with cold and heat storage according to claim 1, characterized in that, Including: When the return water temperature is greater than the set temperature and the indoor average temperature reaches the set temperature, if the air source heat pump unit is in the heating process, the frequency of the air source heat pump circulating pump is reduced; If the air source heat pump unit is in the heating process, the frequency of the cold storage circulating pump is reduced; If the air source heat pump unit is in the heating and cold storage process, the air source heat pump circulating pump frequency is unchanged, the frequency of the heating and cooling circulating pump is reduced, otherwise the running parameters are unchanged.

6. The peak-valley electricity and load depth matching operation control method of air source heat pump coupled with cold and heat storage according to claim 1, characterized in that, The air source heat pump coupled cold storage and heat storage system running mode is adjusted according to the peak and valley electricity period of the power grid, and the system operation is deeply matched with the peak and valley electricity period of the power grid, including: The current month and the peak and valley electricity period are judged, if the current month is in the heating season and the peak and valley electricity period is in the valley period of the power grid, the air source heat pump coupled cold storage and heat storage system running mode is adjusted to the air source heat pump unit heating and heat storage mode, the air source heat pump unit is started to heat, and the heat storage circulating pump and the heat storage electromagnetic valve are started to heat, and the phase change heat storage module is heat stored; If the current month is in the heating season and the peak and valley electricity period is in the peak period of the power grid, the air source heat pump coupled cold storage and heat storage system is switched to the heat release mode, the air source heat pump unit and the air source heat pump circulating pump are in standby state, and the energy of the phase change heat storage module is preferentially released; If the current month is in the heating season and the peak and valley electricity period is in the flat period of the power grid, the switching is carried out according to the energy storage state of the phase change heat storage module, if the phase change heat storage module meets the heat release condition, the heat release mode is maintained, otherwise the air source heat pump unit is switched to heating; If the current month is in the cooling season and the peak and valley electricity period is in the valley period of the power grid, the air source heat pump coupled cold storage and heat storage system running mode is adjusted to the air source heat pump unit cooling and cold storage mode, the air source heat pump unit is started to cool, and the cold storage circulating pump and the cold storage electromagnetic valve are started to cool, and the phase change cold storage module is cold stored; If the current month is in the cooling season and the peak and valley electricity period is in the peak period of the power grid, the air source heat pump coupled cold storage and heat storage system is switched to the cooling release mode, the air source heat pump unit and the air source heat pump circulating pump are in standby state, and the energy of the phase change cold storage module is preferentially released; If the current month is in the cooling season and the peak-valley electricity time period is in the power grid flat section, switching is performed according to the energy storage state of the phase change cold storage module, if the phase change cold storage module meets the cooling release condition, the cooling release mode is maintained, otherwise the air source heat pump unit cooling is switched on.

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