Air conditioner control method and device, electronic equipment and storage medium

Abstract

The invention provides an air conditioner control method and device, electronic equipment and a storage medium. The method comprises the steps that if a new demand response event occurs, the response lag duration of the electronic expansion valve at the end moment of a historical demand response event is obtained; according to the response lagging duration, when it is determined that the demand response event ends, a first strategy or a second strategy is adopted to control the opening degree of the electronic expansion valve till it is determined that the control end condition is met; wherein the first strategy comprises the steps that the opening degree of the electronic expansion valve is controlled to rise to a first preset opening degree; wherein the second strategy comprises the steps that the opening degree of the electronic expansion valve is controlled to rise to a second preset opening degree, and the opening degree of the electronic expansion valve in the next time step length is adjusted. According to the method, the problem of how to reduce the shutdown risk of the fluorine system air conditioner caused by low-voltage protection after the demand response time is ended can be solved.

Description

Technical Field

[0001] The present application relates to air conditioning control technology, and in particular to an air conditioning control method, device, electronic device, and storage medium. Background Art

[0002] With rapid socioeconomic development and the continuous improvement of people's living standards, various types of air conditioners have become widely used. This widespread use of air conditioners has resulted in a significant "air conditioning load." This rapid increase in air conditioning load can lead to numerous problems on the power grid, such as widening peak-to-valley differences, deteriorating load characteristics, and significant load spikes. To ensure the economical, safe, and stable operation of the power grid, the power grid issues power reduction requirements for air conditioners to regulate the load. In response, the air conditioners implement demand response to the grid. Currently, there are two common demand response methods for fluorine-based air conditioners: one forcibly reduces the compressor operating frequency to 70% of rated power under normal curtailment conditions, and the other forcibly reduces the compressor operating frequency to 40% of rated power under strict curtailment conditions.

[0003] However, at the end of the demand response, the air conditioner switches from the demand response control mode to the free control (PI control) mode, causing the compressor to increase its frequency extremely quickly. The action time of the electronic expansion valve is restricted by factors such as the air conditioner's pipeline length, electronic control delay time, and temperature sensing signal transmission. The time when its valve body senses the compressor's exhaust superheat always lags behind the compressor's frequency increase response time at the end of the demand response. In other words, at the end of the demand response, due to the rapid frequency increase of the compressor, the pressure on the low-pressure side of the air conditioner drops rapidly, and the electronic expansion valve fails to increase its opening in time, resulting in even lower pressure on the low-pressure side of the air conditioner. Excessively low pressure on the low-pressure side of the air conditioner will trigger the low-pressure protection of the air conditioner, causing the air conditioner to shut down and fail to operate normally.

[0004] Therefore, how to reduce the risk of shutdown of fluorine system air conditioners due to low-pressure protection after the demand response time ends still needs to be considered. Summary of the Invention

[0005] The present application provides an air conditioning control method, device, electronic device, and storage medium to solve the problem of how to reduce the risk of shutdown of a fluorine system air conditioner due to low-voltage protection after the demand response time ends.

[0006] In one aspect, the present application provides an air conditioning control method, comprising:

[0007] If a new demand response event occurs, obtain the response lag time of the electronic expansion valve at the end of the historical demand response event;

[0008] determining, based on the response lag time, that the first strategy or the second strategy is adopted to control the opening of the electronic expansion valve when the demand response event ends, until it is determined that a control end condition is met;

[0009] Wherein, the first strategy includes: controlling the opening of the electronic expansion valve to increase to a first preset opening;

[0010] The second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

[0011] In one embodiment, adjusting the opening of the electronic expansion valve at the next time step includes:

[0012] Adjusting the opening of the electronic expansion valve at the next time step based on the opening assignment relationship or the air conditioning operating parameters obtained in real time;

[0013] The air conditioning operating parameters include at least one of the following: the operating frequency of the compressor, the exhaust superheat of the compressor and the low-pressure side pressure of the air conditioner; the opening assignment relationship is used to reflect the number and duration of the low-pressure side pressure dropping to the preset minimum pressure, and the mapping relationship between the opening adjustment value.

[0014] In one embodiment, when the air conditioning operating parameter includes the operating frequency, adjusting the opening of the electronic expansion valve at the next time step based on the air conditioning operating parameter acquired in real time includes:

[0015] Obtaining an expected operating frequency of the compressor at the next time step according to the rising speed of the operating frequency;

[0016] determining an expected mass flow rate based on the expected operating frequency;

[0017] According to the mapping relationship between the expected mass flow rate and the opening degree, the opening degree of the electronic expansion valve in the next time step is adjusted.

[0018] In one embodiment, when the air conditioning operating parameter includes the exhaust gas superheat, adjusting the opening of the electronic expansion valve at the next time step based on the air conditioning operating parameter acquired in real time includes:

[0019] Obtaining an exhaust superheat difference between the exhaust superheat obtained in real time and the exhaust superheat obtained in a previous time step;

[0020] When the exhaust superheat difference is greater than a tolerance value, adjusting the opening of the electronic expansion valve in the next time step to be greater than the current opening of the electronic expansion valve;

[0021] When the exhaust superheat difference is less than or equal to the tolerance value, the opening of the next time step is adjusted to be smaller than the current opening.

[0022] In one embodiment, controlling the opening of the electronic expansion valve to increase to a second preset opening includes:

[0023] Get the maximum opening and safety factor of the electronic expansion valve;

[0024] The second preset opening is determined according to the maximum opening and the safety factor, and the opening of the electronic expansion valve is controlled to increase to the second preset opening.

[0025] In one embodiment, adjusting the opening of the electronic expansion valve at the next time step based on the opening assignment relationship or the air conditioning operating parameters obtained in real time includes:

[0026] Get the decreasing speed of the low-pressure side pressure;

[0027] When the decreasing speed is greater than the first speed, adjusting the opening of the electronic expansion valve in the next time step based on the exhaust gas superheat of the compressor or the low-pressure side pressure of the air conditioner;

[0028] When the descending speed is less than or equal to the first speed, the opening degree of the electronic expansion valve in the next time step is adjusted based on the opening degree assignment relationship.

[0029] In one embodiment, determining, based on the response lag time, whether to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends includes:

[0030] When the response lag time is less than the first time and greater than the second time, determining that the demand response event ends and adopting the first strategy to control the opening of the electronic expansion valve;

[0031] When the time after the response is greater than or equal to the first time, it is determined that the demand response event ends and the second strategy is adopted to control the opening of the electronic expansion valve.

[0032] In one embodiment, determining that a control termination condition is met includes:

[0033] When the low-pressure side pressure remains within the preset pressure range within the preset time period, it is determined that the control end condition has been met;

[0034] The maximum pressure of the preset pressure range is obtained by fitting the operating frequency of the air conditioner during the non-demand response period, the low-pressure side pressure, and the exhaust gas superheat.

[0035] In one embodiment, the first strategy and the second strategy both further include:

[0036] The rising speed of the operating frequency is reduced to the target speed.

[0037] In another aspect, the present application provides an air conditioning control device, comprising:

[0038] An acquisition module is used to obtain the response lag time of the electronic expansion valve at the end of a historical demand response event if a new demand response event occurs;

[0039] a control module, which determines, based on the response lag time, when the demand response event ends, to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve until it is determined that a control end condition is met;

[0040] Wherein, the first strategy includes: controlling the opening of the electronic expansion valve to increase to a first preset opening;

[0041] The second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

[0042] On the other hand, the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0043] The memory stores computer-executable instructions;

[0044] The processor executes the computer-executable instructions stored in the memory to implement the method according to the first aspect.

[0045] On the other hand, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When the instructions are executed, the computer executes the method described in the first aspect.

[0046] On the other hand, the present application provides a computer program product, including a computer program, which is used to implement the air conditioning control method as described in the first aspect when executed by a processor.

[0047] In summary, the air conditioning control method provided by the embodiment of the present application includes: if a new demand response event occurs, obtaining the response lag time of the electronic expansion valve at the end time of the historical demand response event; based on the response lag time, determining whether to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve at the end of the demand response event until it is determined that the control end condition is met. Among them, the first strategy includes: controlling the opening of the electronic expansion valve to rise to a first preset opening. Among them, the second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

[0048] That is, the air conditioner's electronic expansion valve opening is increased in advance, or the opening is continuously adjusted to prevent the triggering of low-pressure protection due to insufficient opening of the electronic expansion valve. This reduces the risk of fluorine system air conditioners shutting down due to low-pressure protection after the demand response time expires. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0050] Figure 1 Schematic diagram of compressor frequency increase provided for this application;

[0051] Figure 2 A flowchart of an air conditioning control method provided in one embodiment of the present application;

[0052] Figure 3 A schematic diagram of opening degree changes in an air conditioning control method provided in one embodiment of the present application;

[0053] Figure 4 A schematic diagram of changes in exhaust gas superheat in an air conditioning control method provided in one embodiment of the present application;

[0054] Figure 5 A schematic diagram of changes in low-pressure side pressure in an air conditioning control method provided in one embodiment of the present application;

[0055] Figure 6 A schematic diagram of opening degree changes in an air conditioning control method provided by another embodiment of the present application;

[0056] Figure 7 A schematic diagram of changes in exhaust gas superheat in an air conditioning control method provided by another embodiment of the present application;

[0057] Figure 8 A schematic diagram of changes in low-pressure side pressure in an air conditioning control method provided by another embodiment of the present application;

[0058] Figure 9 A flowchart of an air conditioning control method provided in yet another embodiment of the present application;

[0059] Figure 10 A schematic diagram of the change of the opening degree in the air conditioning control method provided in another embodiment of the present application;

[0060] Figure 11 A schematic diagram of changes in exhaust gas superheat in an air conditioning control method provided in yet another embodiment of the present application;

[0061] Figure 12A schematic diagram of changes in low-pressure side pressure in an air conditioning control method provided in yet another embodiment of the present application;

[0062] Figure 13 A schematic diagram of changes in low-pressure side pressure in an air conditioning control method provided by another embodiment of the present application;

[0063] Figure 14 A schematic diagram of changes in low-pressure side pressure in an air conditioning control method provided by another embodiment of the present application;

[0064] Figure 15 A schematic diagram of an air conditioning control device provided in one embodiment of the present application;

[0065] Figure 16 A schematic diagram of an electronic device provided for one embodiment of the present application.

[0066] The above drawings illustrate specific embodiments of the present disclosure, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0067] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0068] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] First, let’s explain the terms involved in this application:

[0070] Exhaust superheat: The temperature difference between the compressor exhaust pipe and the saturation temperature corresponding to the actual condensing pressure. This refers to how many degrees the current actual temperature is higher than the saturation temperature corresponding to the actual pressure. Exhaust superheat = Exhaust temperature - Saturation temperature corresponding to the exhaust pressure.

[0071] With rapid socioeconomic development and the continuous improvement of people's living standards, various types of air conditioners have become widely used. This widespread use of air conditioners has resulted in a significant "air conditioning load." This rapid increase in air conditioning load can lead to numerous problems on the power grid, such as widening peak-to-valley differences, deteriorating load characteristics, and significant load spikes. To ensure the economical, safe, and stable operation of the power grid, the power grid issues power reduction requirements for air conditioners to regulate the load. In response, the air conditioners implement demand response to the grid. Currently, there are two common demand response methods for fluorine-based air conditioners: one forcibly reduces the compressor operating frequency to 70% of rated power under normal curtailment conditions, and the other forcibly reduces the compressor operating frequency to 40% of rated power under strict curtailment conditions.

[0072] See Figure 1 However, at the end of the demand response, the air conditioner switches from demand response control mode to free control (PI control), causing the compressor to ramp up very quickly. The electronic expansion valve's actuation timing is constrained by factors such as the air conditioner's piping length, electronic control delay, and temperature sensing signal transmission. The valve's sensing of the compressor's exhaust superheat always lags behind the compressor's ramp-up time at the end of the demand response.

[0073] That is to say, at the end of the demand response, the compressor's frequency increase action is rapid, causing the pressure on the low-pressure side of the air conditioner to drop rapidly, and the electronic expansion valve does not increase its opening in time, resulting in an even lower pressure on the low-pressure side of the air conditioner. Too low pressure on the low-pressure side of the air conditioner will trigger the low-pressure protection of the air conditioner. Taking a strict demand response event as an example, during the period of demand response events, the compressor frequency of the fluorine system air conditioner is limited to low-frequency operation. At this time, the opening of the electronic expansion valve, which relies on detecting the exhaust superheat of the compressor, is relatively small. At the end of the demand response event, the compressor's action is rapid, causing the pressure on the low-pressure side to drop rapidly, and the electronic expansion valve does not increase its opening in time, causing the pressure on the low-pressure side to be too low, triggering low-pressure protection.

[0074] Low-voltage protection can easily cause the air conditioner to shut down and not operate normally, affecting its normal use. Therefore, how to reduce the risk of downtime caused by low-voltage protection in fluorine system air conditioners after the demand response time ends is still a matter of consideration.

[0075] Based on this, the present application provides an air conditioning control method, device, electronic device, and storage medium. The air conditioning control method includes: if a new demand response event occurs, obtaining the response lag time of the electronic expansion valve at the end time of the historical demand response event; according to the response lag time, determining whether to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve at the end of the demand response event until it is determined that the control end condition is met. Among them, the first strategy includes: controlling the opening of the electronic expansion valve to rise to a first preset opening. Among them, the second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

[0076] That is, the air conditioner's electronic expansion valve opening is increased in advance, or the opening is continuously adjusted to prevent the triggering of low-pressure protection due to insufficient opening of the electronic expansion valve. This reduces the risk of fluorine system air conditioners shutting down due to low-pressure protection after the demand response time expires.

[0077] The air conditioning control method provided in this application is applied to electronic devices, such as air conditioning controllers, cloud servers, etc.

[0078] See Figure 2 One embodiment of the present application provides an air conditioning control method, comprising:

[0079] S210: If a new demand response event occurs, obtain the response lag time of the electronic expansion valve at the end time of the historical demand response event.

[0080] It should be noted that the air conditioner in this embodiment refers to an air conditioning system.

[0081] The demand response event refers to an event that occurs in response to the power reduction demand on the grid side. During the period of the demand response event, the compressor reduces the operating frequency, that is, the compressor reduces the frequency. After the demand response event ends, the compressor quickly increases the operating frequency, that is, the compressor increases the frequency. Specifically, at the end of the demand response event, the air conditioner switches from the demand response control mode to the free control (PI control) mode, resulting in an extremely fast compressor frequency increase rate. The action time of the electronic expansion valve is restricted by factors such as the air conditioner pipeline length, electronic control delay events, and temperature sensing signal transmission. The time when its valve body senses the scheduled overheating of the compressor always lags behind the compressor frequency increase response time at the end of the demand response event. The time that the electronic expansion valve lags behind the compressor frequency increase response time is referred to as the response lag time in this embodiment.

[0082] For an air conditioner, the response lag of the electronic expansion valve is fixed. Therefore, when a new demand response event occurs, if you want to know the response lag of the electronic expansion valve, you can directly obtain the response lag of the electronic expansion valve at the end of the previous demand response event.

[0083] S220 , determining, based on the response lag time, whether to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends, until it is determined that a control end condition is met.

[0084] Different response hysteresis times correspond to different strategies. It's understandable that the longer the response hysteresis, the more necessary it is to intervene in the opening of the electronic expansion valve. The purpose of this intervention is to prevent the low-voltage side voltage of the air conditioner from triggering the low-voltage protection function, that is, to prevent the low-voltage side voltage of the air conditioner from falling too low.

[0085] In an optional embodiment, when the response lag time is less than the first time period and greater than the second time period, it is determined that the demand response event has ended, and a first strategy is employed to control the opening of the electronic expansion valve. The first strategy includes controlling the opening of the electronic expansion valve to increase to a first preset opening.

[0086] See Figure 3 , Figure 3 Where t1 represents the time when the electronic expansion valve opening is preset, and t2 represents the end time of the demand response event. That is, during the demand response event period or before the demand response event occurs, a fixed opening is set for the electronic expansion valve, that is, the first preset opening is set for the electronic expansion valve, so that the opening of the electronic expansion valve increases after the demand response event ends. Figure 4 If the value of the first preset opening is reasonable, then the exhaust superheat (SH) of the compressor will be lowered from the allowable lower limit SH for a period of time after the demand response event ends. low Towards the allowable upper limit SH high When the refrigerant cycle becomes stable, the exhaust superheat SH will also decrease from the allowable upper limit SH high Gradually to the normal value SH of PI control PI Change until it stabilizes. The pressure change trend of the low-pressure side of the air conditioner is as follows Figure 5 shown.

[0087] It should be noted that the first preset opening can be different for different air conditioners. The slower the speed at which the electronic expansion valve transmits signals, the larger the first preset opening. When the first preset opening is large enough and reaches the limit value, it will undoubtedly threaten the exhaust superheat of the compressor, and the exhaust superheat will become smaller and smaller. If the opening of the electronic expansion valve is increased to the maximum value, it still cannot keep the exhaust superheat during the compressor frequency increase process within the allowable limit SH. high, it means that the first strategy is no longer applicable to the control of the air conditioner.

[0088] Optionally, the first strategy further includes reducing the operating frequency increase rate to a target rate. Specifically, the compressor operating frequency increase rate is reduced from a Hz / min to b Hz / min, changing the compressor operating frequency from a sharp increase to a gradual increase. This allows the electronic expansion valve more time to respond.

[0089] In an optional embodiment, when the duration after the response is greater than or equal to the first duration, it is determined that the demand response event has ended, and a second strategy is employed to control the opening of the electronic expansion valve. The second strategy includes controlling the opening of the electronic expansion valve to increase to a second preset opening and adjusting the opening of the electronic expansion valve at the next time step.

[0090] Specifically, first, at a time Ta before the end of the demand response event, the opening of the electronic expansion valve is increased to the second preset opening within an allowable range. Boundary conditions of the allowable range include, but are not limited to, upper and lower limits of refrigerant mass flow, upper and lower limits of system superheat, and the maximum opening limit of the electronic expansion valve.

[0091] Optionally, the maximum opening and safety factor of the electronic expansion valve are obtained, and the second preset opening is determined based on the maximum opening and the safety factor. The opening of the electronic expansion valve is controlled to increase to the second preset opening. Specifically, the second preset opening = maximum opening × safety factor. The safety factor can be set as appropriate based on the equipment status of the air conditioner, for example, 95%, 90%, 85%, etc. The maximum opening of the electronic expansion valve may vary in different air conditioners, and the maximum opening of the electronic expansion valve needs to be determined based on actual conditions.

[0092] Secondly, the opening of the electronic expansion valve in the next time step is adjusted to prevent the low-pressure side pressure of the air conditioner from being too low and triggering low-pressure protection. The adjustment includes increasing or decreasing. Before the air conditioner enters the free control mode, the opening of the electronic expansion valve in the next time step is adjusted in real time to prevent the low-pressure side pressure of the air conditioner from being too low and triggering low-pressure protection. Optionally, the opening of the electronic expansion valve in the next time step can be adjusted based on real-time measured data, such as real-time measured low-pressure side pressure, exhaust superheat, etc. Optionally, the opening of the electronic expansion valve in the next time step can be adjusted based on the compressor frequency of the compressor. Optionally, the opening of the electronic expansion valve in the next time step can be adjusted based on real-time measured parameters and a pre-set mapping relationship. The real-time measured parameters can be, for example, the number of times the low-pressure side pressure of the air conditioner touches the bottom, the duration of the bottoming, etc.

[0093] In an optional embodiment, the opening of the electronic expansion valve in the next time step is adjusted based on the air conditioning operating parameters obtained in real time. The air conditioning operating parameters include the operating frequency of the compressor. Specifically, based on the rising rate of the operating frequency, the expected operating frequency of the compressor in the next time step is obtained, for example, the expected operating frequency is f. Then, based on the expected operating frequency, the expected mass flow rate is determined, for example, the expected mass flow rate is Q m According to the mapping relationship between the expected mass flow rate and the opening degree, the opening degree of the electronic expansion valve in the next time step is adjusted.

[0094] When determining the expected mass flow rate based on the expected operating frequency, first, according to the formula Q AC =bf+c or formula Q AC =af 2 +bf+c to determine the expected cooling capacity of the air conditioner, where f represents the expected operating frequency of the compressor, Q AC represents the expected cooling capacity of the air conditioner, and a, b, and c are constant coefficients obtained by fitting based on historical data or measured data. AC =q·Q m Determine the expected mass flow rate, where Q AC represents the expected cooling capacity, q represents the cooling capacity per unit mass of refrigerant, Q m Represents the expected mass flow. After determining the expected mass flow, according to the formula Determine the opening of the electronic expansion valve in the next time step, where Q m represents the expected mass flow rate, F0 represents the opening of the electronic expansion valve in the next time step, P1 and P2 represent the inlet and outlet pressures of the electronic expansion valve, ρ1 represents the inlet refrigerant density of the electronic expansion valve, and C represents the discharge coefficient, which can be obtained based on experimental data.

[0095] Optionally, the opening of the electronic expansion valve at the next time step can be determined based on a mapping relationship between the expected operating frequency and the opening of the electronic expansion valve. Specifically, the mapping relationship between the expected operating frequency and the opening of the electronic expansion valve is F=f(f), where F represents the opening of the electronic expansion valve and f represents the expected operating frequency.

[0096] The mapping relationship between the expected operating frequency and the opening degree of the electronic expansion valve F=f(f) can be obtained by fitting based on formulas 1 to 4. Formula 1 is Q AC =bf+c or Q AC =af 2 +bf+c, formula 2 is Formula 3 is Q AC =q·Q m=q·f(n), formula 4 is n=60f(1-s) / p. In the formula, Q AC represents the cooling capacity of the air conditioner, f represents the operating frequency of the compressor, a, b, and c are constant coefficients obtained by fitting based on historical data or measured data, and Q m represents the mass flow rate, q represents the cooling capacity of unit mass of refrigerant, F0 represents the opening of the electronic expansion valve in the next time step, P1 and P2 represent the inlet and outlet pressures of the electronic expansion valve, ρ1 represents the inlet refrigerant density of the electronic expansion valve, C represents the discharge coefficient, which can be obtained based on experimental data, n represents the compressor speed, p represents the pole pair number, and s represents the slip rate.

[0097] Optionally, the second strategy also includes reducing the operating frequency increase rate to a target rate. Specifically, the compressor operating frequency increase rate is reduced from a Hz / min to b Hz / min, changing the compressor operating frequency from a sharp increase to a slow increase. This allows the electronic expansion valve more time to respond.

[0098] In summary, different response lag times correspond to different strategies. When the response lag is short, the first strategy can be used to control the electronic expansion valve; when the response lag is long, the second strategy can be used to control the electronic expansion valve. Using either the first or second strategy to control the electronic expansion valve prevents the air conditioner's low-voltage side voltage from triggering the air conditioner's low-voltage protection, effectively preventing the air conditioner's low-voltage side voltage from falling too low, thereby reducing the risk of the air conditioner shutting down due to low-voltage protection.

[0099] The first strategy or the second strategy is adopted to control the opening of the electronic expansion valve, and when it is determined that the control end condition is reached, the control of the opening of the electronic expansion valve is stopped. Reaching the control end condition means that the air conditioner switches from the demand response control mode to the free control mode (PI mode). Optionally, when the low-pressure side pressure continues to be within the preset pressure range within a preset time period, it is determined that the control end condition is reached. The maximum pressure of the preset pressure range is obtained by fitting the operating frequency, the low-pressure side pressure and the exhaust superheat of the air conditioner during the non-demand response period. The control end condition can also be other conditions, for example, the exhaust superheat of the compressor fluctuates within the preset exhaust heat range, the operating frequency of the compressor fluctuates within the preset operating frequency range, etc. This embodiment does not specifically limit the control end condition.

[0100] In an optional embodiment, when the response lag time of the electronic expansion valve is very short, for example, when the response lag time is less than or equal to the second time, no excessive intervention is required, and the opening of the electronic expansion valve is controlled based solely on the scheduled superheat control logic of the electronic expansion valve itself. In this case, the opening change of the electronic expansion valve is as follows: Figure 6 As shown in the figure, the variation trend of exhaust superheat is as follows: Figure 7 As shown in the figure, the changing trend of the low-pressure side pressure is as follows: Figure 8 shown.

[0101] In summary, the air conditioning control method provided in this embodiment includes: if a new demand response event occurs, obtaining the response lag duration of the electronic expansion valve at the end of the historical demand response event; based on the response lag duration, determining whether to use the first strategy or the second strategy to control the opening of the electronic expansion valve at the end of the demand response event until it is determined that the control termination condition is met. The first strategy includes: controlling the opening of the electronic expansion valve to increase to a first preset opening. The second strategy includes: controlling the opening of the electronic expansion valve to increase to a second preset opening, and adjusting the opening of the electronic expansion valve for the next time step.

[0102] That is, the air conditioner's electronic expansion valve opening is increased in advance, or the opening is continuously adjusted to prevent the triggering of low-pressure protection due to insufficient opening of the electronic expansion valve. This reduces the risk of fluorine system air conditioners shutting down due to low-pressure protection after the demand response time expires.

[0103] See Figure 9 One embodiment of the present application provides an air conditioning control method, comprising:

[0104] S910: If a new demand response event occurs, obtain the response lag time of the electronic expansion valve at the end time of the historical demand response event.

[0105] For a detailed description of this step, reference may be made to the relevant description of step S210 in the above embodiment, which will not be repeated here.

[0106] S920: Determine, based on the response lag time, that a second strategy is employed to control the opening of the electronic expansion valve when the demand response event ends, until a control termination condition is determined to be met. The second strategy is to control the opening of the electronic expansion valve to increase to a second preset opening, and then adjust the opening of the electronic expansion valve for the next time step based on the opening value assignment relationship.

[0107] The opening assignment relationship is used to reflect the mapping relationship between the number and duration of the low-pressure side pressure dropping to the preset minimum pressure and the opening adjustment value.

[0108] In one optional embodiment, the rate of decrease of the low-pressure side pressure is obtained. When the rate of decrease is greater than a first rate, the opening of the electronic expansion valve for the next time step is adjusted based on the compressor exhaust superheat or the air conditioner low-pressure side pressure. When the rate of decrease is less than or equal to the first rate, the opening of the electronic expansion valve for the next time step is adjusted based on an opening assignment relationship. In other words, when the low-pressure side pressure decreases slowly, the real-time opening of the electronic expansion valve is adjusted based on the opening assignment relationship.

[0109] The following describes the adjustment method for the opening degree of the electronic expansion valve when the low-pressure side pressure drops slowly.

[0110] Please refer to Figure 10 、 Figure 11 and Figure 12 , first, before the demand response event ends, set the second preset opening degree A so that the low-pressure side pressure P at the end of the demand response DR is close to the upper limit value P of the allowable low-pressure side pressure max , or make the exhaust superheat SH of the compressor close to the minimum allowable exhaust superheat SH min . Among them, the upper limit value P of the allowable low-pressure side pressure max can be obtained by fitting the hourly frequency, pressure data, and exhaust superheat data of the compressor under the existing conventional operation mode. For example, the target exhaust superheat SH aim is 25 °C, and the acceptable range is 22-27 °C. The conventional low-pressure side pressure corresponding to the hourly power of the compressor under the conventional operating condition (SH = 25 °C) can be obtained based on historical data and approximately fitted as the upper limit value P of the allowable low-pressure side pressure max fitting line, or it can be simplified to use a specific reasonable value within the range of 22 °C < SH < 27 °C as the upper limit value P of the allowable low-pressure side pressure max .

[0111] Then obtain the number N DR of times when the low-pressure side pressure P min drops to the preset minimum pressure P P_Pmin and the duration T P_Pmin , substitute the number N P_Pmin and the duration T P_Pmin into this opening degree assignment relationship, and query the corresponding opening degree adjustment value x n . Assume that the second preset opening degree is A, then the opening degree for the next n time steps is adjusted to A + x1 + x2 + … + x n . The purpose of real-time adjustment of the opening degree is to make the opening degree of the electronic expansion valve under the current working condition be A + x1 + x2 + … + x n when the low-pressure side pressure P DR can be increased to be close to the upper limit value P of the allowable low-pressure side pressure max . Until after the opening degree of the electronic expansion valve is assigned based on this opening degree assignment relationship, the low-pressure side pressure no longer drops to near the lower limit value P of the allowable low-pressure side pressure min , but fluctuates within a certain reasonable range P min < P i < P max , indicating that the opening degree of this electronic expansion valve is already close to the low-pressure side pressure control in the free control mode PIThe corresponding electronic expansion valve opening can be switched to free control mode.

[0112] Specifically, after the demand response event ends, the low-pressure side pressure P of the air conditioner is detected at a high frequency. DR , when the low-pressure side pressure approaches the low-pressure side allowable pressure lower limit P min When the compressor exhaust superheat SH is close to the minimum allowable compressor exhaust superheat SH min When the electronic expansion valve opening is assigned A+x1, the system low-pressure side pressure is close to the low-pressure side allowable pressure upper limit P max Continue to detect the electronic expansion valve after the assigned opening. As the operating frequency of the compressor increases, the low-pressure side pressure gradually approaches the low-pressure side allowable pressure lower limit P min , and assign the electronic expansion valve opening to A+x1+x2 again, so that the low-pressure side pressure is close to the low-pressure side allowable pressure upper limit P max Until a certain opening is assigned, the low-pressure side pressure is no longer close to the low-pressure side allowable pressure lower limit P min , but fluctuates within a reasonable range P min <P DR <P max , indicating that the opening of the electronic expansion valve is close to the low-pressure side pressure control P in the free control mode. PI The corresponding electronic expansion valve opening can be switched to free control mode.

[0113] Single bottoming times N P_Pmin , pressure bottoming time T P_Pmin The length of T essentially corresponds to the impact of different environmental conditions on the refrigerant cycle performance. Taking heating as an example, the stricter the external conditions (cold), the worse the refrigerant cycle performance, the greater the fluid viscosity, and the more unfavorable the cycle. Considering different pressure bottoming times T P_Pmin and the number of bottoming out N P_Pmin Under working conditions, it is necessary to set the lower limit of the allowable pressure on the low pressure side P min Adjust to the upper limit of the allowable pressure on the low pressure side P max The electronic expansion valve opening required for the working condition is x1, x2, ..., x n Assignment. That is, based on the experiment, determine N under different bottoming times. P_Pmin , the pressure bottoming time T of this working condition P_Pmin and valve opening x1, x2, ..., x n relationship.

[0114] The opening assignment relationship can be expressed in the form of assignment tables shown in Tables 1 and 2. Table 1 shows the relationship between the number of times the low-pressure side pressure drops to the preset minimum pressure and the duration, and Table 2 shows the relationship between the corresponding opening adjustment value and the duration of time the low-pressure side pressure drops to the preset minimum pressure when the number of times the low-pressure side pressure drops to the preset minimum pressure is fixed.

[0115] Table 1:

[0116]

[0117] Table 2:

[0118]

[0119] It should be noted that adjusting the real-time opening of the electronic expansion valve based on the opening assignment relationship is suitable for situations where the bottoming out frequency is rare. This adjustment presupposes that the air conditioning piping length remains unchanged, the starting operating frequencies of different compressors are determined, the compressor frequency ramp-up rate is constant, and there are no sudden changes in the indoor and outdoor environments.

[0120] At step S930, based on the response lag time, a second strategy is determined to be employed to control the opening of the electronic expansion valve when the demand response event ends, until a control termination condition is determined to be met. The second strategy is to control the opening of the electronic expansion valve to a second preset opening, and then adjust the opening of the electronic expansion valve for the next time step based on the real-time acquired air conditioning operating parameters.

[0121] The air conditioner operating parameter includes at least one of the following: an operating frequency of the compressor, an exhaust superheat of the compressor, and a low-pressure side pressure of the air conditioner.

[0122] For the specific implementation method of adjusting the opening of the electronic expansion valve at the next time step according to the operating frequency of the compressor, reference may be made to the relevant description of the above embodiment, which will not be repeated here.

[0123] In one optional embodiment, the rate of decrease of the low-pressure side pressure is detected. When this rate of decrease is greater than a first rate, the opening of the electronic expansion valve is adjusted for the next time step based on the compressor's exhaust gas superheat or the air conditioner's low-pressure side pressure. In other words, when the low-pressure side pressure drops too quickly, the opening of the electronic expansion valve is adjusted in real time based on real-time measured data to prevent triggering low-pressure protection.

[0124] The following describes how to adjust the opening of the electronic expansion valve when the low-pressure side pressure drops too quickly.

[0125] First, before the demand response ends, the second preset opening A is set so that the low-pressure side pressure P at the end of the demand response is DR Close to the upper limit of the allowable pressure on the low pressure side Pmax or make the superheat SH of the compressor discharge approach the minimum allowable superheat SH min .

[0126] The upper limit value P of the allowable pressure on the low-pressure side max can be obtained by fitting based on the hourly frequency, pressure data, and superheat data of the compressor under the existing conventional operating mode. For example, the target superheat SH aim is 25°C, and the acceptable range is 22 - 27°C. The hourly power of the compressor corresponding to the conventional low-pressure side pressure under the conventional operating condition (SH = 25°C) can be obtained based on historical data, and approximately fitted as the upper limit value P of the allowable pressure on the low-pressure side max fitting line, or it can also be simplified to use a specific reasonable value within the range of 22°C < SH < 27°C as the upper limit value P of the allowable pressure on the low-pressure side max .

[0127] After the demand response event ends, detect the low-pressure side pressure P DR , when the low-pressure side pressure P DR is close to the lower limit value P of the allowable pressure on the low-pressure side min , assign the opening degree of the electronic expansion valve as A + X. The lower limit value P of the allowable pressure on the low-pressure side of different air conditioners min should generally have specific limit values during the R & D stage, such as 0.07 Mpa. Different assignments of X will affect the pressure fluctuation during the demand response recovery process. If the assignment of X is too small, the pressure will fluctuate and approach the lower limit value P of the allowable pressure on the low-pressure side multiple times min , if the assignment of X is too large, the pressure will tend to the upper limit value P of the allowable pressure on the low-pressure side max , so the setting value of X should be reasonably determined based on the measured data from the previous R & D to minimize the number N of times the low-pressure side pressure drops to the preset minimum pressure P_Pmin .

[0128] Continue to detect the low-pressure side pressure P DR , if the low-pressure side pressure P DR is close to the lower limit value P of the allowable pressure on the low-pressure side min , assign the opening degree of the electronic expansion valve as A + X + X. If the low-pressure side pressure P DR is close to the upper limit value P of the allowable pressure on the low-pressure side max , assign the opening degree of the electronic expansion valve as A + X + X - 0.5X, and so on. Until after a certain assignment of the opening degree, it indicates that the opening degree of this electronic expansion valve has approached the opening degree of the electronic expansion valve corresponding to the low-pressure side pressure control P under the free control mode PI , and it can be switched to the free control mode.

[0129] Please refer to Figure 13 The figure shows the schematic diagram of the change trend of the low-pressure side pressure when the adjustment value X is on the high side. Figure 14 This is a diagram showing the changing trend of the low-pressure side pressure when the adjustment value X is too low. In order to better reduce the risk of triggering the low-pressure protection, it is necessary to more accurately determine the value of the adjustment value X.

[0130] In an optional embodiment, the adjustment value X of the opening degree is determined according to the exhaust gas superheat.

[0131] Specifically, obtain the exhaust superheat SH obtained in real time t_test and the exhaust superheat SH obtained in the previous time step t-1_pred The difference in exhaust superheat between When the exhaust superheat difference is greater than the tolerance value, the opening of the electronic expansion valve in the next time step is adjusted to be greater than the current opening of the electronic expansion valve. When , it indicates that the current opening of the electronic expansion valve is too small, resulting in an increase in exhaust superheat. At this time, the opening of the electronic expansion valve in the next time step can be increased. On the contrary, when the exhaust superheat difference is less than or equal to the tolerance value, the opening of the next time step is adjusted to be less than the current opening. That is, when When , it indicates that the current opening of the electronic expansion valve is too large, resulting in a decrease in exhaust superheat. At this time, the opening of the electronic expansion valve in the next time step can be reduced.

[0132] Optionally, the opening adjustment value X may be determined based on the low-pressure side pressure obtained in real time, or the opening adjustment to X may be determined based on other parameters, which is not limited in this embodiment.

[0133] In summary, when it is determined that the second strategy is to be used to control the opening of the electronic expansion valve, the opening of the electronic expansion valve in the next time step is adjusted based on the opening assignment relationship or the air conditioning operating parameters obtained in real time. When the pressure on the low-pressure side drops too quickly, the opening of the electronic expansion valve in the next time step is adjusted based on the obtained air conditioning operating parameters. When the pressure on the low-pressure side drops more slowly, the opening of the electronic expansion valve in the next time step is adjusted based on the opening assignment relationship. The time step can be set according to actual needs and is not limited in this embodiment. The smaller the time step, the higher the control accuracy of the electronic expansion valve.

[0134] In summary, the air conditioning control method provided in this embodiment includes: if a new demand response event occurs, obtaining the response lag time of the electronic expansion valve at the end time of the historical demand response event. According to the response lag time, it is determined that the second strategy is adopted to control the opening of the electronic expansion valve when the demand response event ends, until it is determined that the control end condition is met. The second strategy is: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step based on the opening assignment relationship. According to the response lag time, it is determined that the second strategy is adopted to control the opening of the electronic expansion valve when the demand response event ends, until it is determined that the control end condition is met. The second strategy is: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step based on the air conditioning operating parameters obtained in real time.

[0135] That is, when it is determined to adopt the second strategy to control the opening of the electronic expansion valve, the opening of the electronic expansion valve in the next time step is adjusted based on the opening assignment relationship or the air-conditioning operating parameters obtained in real time. When the pressure on the low-pressure side drops too quickly, the opening of the electronic expansion valve in the next time step is adjusted based on the obtained air-conditioning operating parameters. When the pressure on the low-pressure side drops slowly, the opening of the electronic expansion valve in the next time step is adjusted based on the opening assignment relationship. By continuously adjusting and increasing the opening, the problem of triggering low-pressure protection due to insufficient opening of the electronic expansion valve is prevented. Thereby, the purpose of reducing the risk of shutdown of the fluorine system air conditioner due to low-pressure protection after the demand response time is over is achieved.

[0136] See Figure 15 One embodiment of the present application further provides an air conditioning control device 10, comprising:

[0137] The acquisition module 11 is configured to acquire the response lag time of the electronic expansion valve at the end time of a historical demand response event if a new demand response event occurs.

[0138] The control module 12 is configured to determine, based on the response hysteresis time, whether to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends, until it is determined that a control end condition is met.

[0139] The first strategy includes: controlling the opening of the electronic expansion valve to increase to a first preset opening;

[0140] The second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

[0141] Optionally, the control module 12 is specifically used to: adjust the opening of the electronic expansion valve in the next time step based on the opening assignment relationship or the air-conditioning operating parameters obtained in real time; the air-conditioning operating parameters include at least one of the following: the operating frequency of the compressor, the exhaust superheat of the compressor and the low-pressure side pressure of the air-conditioning; the opening assignment relationship is used to reflect the number and duration of the low-pressure side pressure dropping to the preset minimum pressure, and the mapping relationship between the opening adjustment value.

[0142] Optionally, the control module 12 is specifically used to: when the air-conditioning operating parameters include the operating frequency, obtain the expected operating frequency of the compressor in the next time step according to the rising rate of the operating frequency; determine the expected mass flow rate according to the expected operating frequency; and adjust the opening of the electronic expansion valve in the next time step according to the mapping relationship between the expected mass flow rate and the opening.

[0143] Optionally, the control module 12 is specifically used to: when the air-conditioning operating parameters include the exhaust superheat, obtain the exhaust superheat difference between the exhaust superheat obtained in real time and the exhaust superheat obtained in the previous time step; when the exhaust superheat difference is greater than the tolerance value, adjust the opening of the electronic expansion valve in the next time step to be greater than the current opening of the electronic expansion valve; when the exhaust superheat difference is less than or equal to the tolerance value, adjust the opening of the next time step to be less than the current opening.

[0144] Optionally, the control module 12 is specifically configured to: obtain a maximum opening and a safety factor of the electronic expansion valve; determine the second preset opening according to the maximum opening and the safety factor, and control the opening of the electronic expansion valve to rise to the second preset opening.

[0145] Optionally, the control module 12 is specifically used to: obtain the falling rate of the low-pressure side pressure; when the falling rate is greater than the first speed, adjust the opening of the electronic expansion valve in the next time step based on the exhaust superheat of the compressor or the low-pressure side pressure of the air conditioner; when the falling rate is less than or equal to the first speed, adjust the opening of the electronic expansion valve in the next time step based on the opening assignment relationship.

[0146] Optionally, the control module 12 is specifically used to: when the response lag time is less than the first time length and greater than the second time length, determine that the first strategy is used to control the opening of the electronic expansion valve when the demand response event ends; when the time length after the response is greater than or equal to the first time length, determine that the second strategy is used to control the opening of the electronic expansion valve when the demand response event ends.

[0147] Optionally, the control module 12 is specifically used to: determine that the control end condition is met when the low-pressure side pressure continues to be within a preset pressure range within a preset time period; wherein the maximum pressure of the preset pressure range is obtained by fitting the operating frequency of the air conditioner during the non-demand response period, the low-pressure side pressure and the exhaust superheat.

[0148] Optionally, both the first strategy and the second strategy further include: reducing the rising speed of the operating frequency to a target speed.

[0149] The air conditioning control device provided in the embodiment of the present application can execute the air conditioning control method in the above method embodiment, and its implementation principle and technical effect are similar, which will not be described in detail here. Figure 15 The division of the modules shown is only a schematic illustration, and this application does not limit the division of the modules and the naming of the modules.

[0150] See Figure 16 One embodiment of the present application further provides an electronic device 20, comprising a processor 21 and a memory 22 in communication with the processor 21. The memory 22 stores computer-executable instructions, and the processor 21 executes the computer-executable instructions stored in the memory 22 to implement the air conditioning control method provided in any of the above embodiments.

[0151] The present application also provides a computer-readable storage medium, which stores computer-executable instructions. When the instructions are executed, the computer-executable instructions are executed by a processor to implement the air-conditioning control method provided in any of the above embodiments.

[0152] The present application also provides a computer program product, including a computer program, which, when executed by a processor, is used to implement the air conditioning control method provided in any of the above embodiments.

[0153] It should be noted that the computer-readable storage medium may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface mount storage device, an optical disc, or a compact disc read-only memory (CD-ROM). It may also be various electronic devices that include one or any combination of the above memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0154] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0155] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0156] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0157] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0158] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0159] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0160] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An air conditioning control method, characterized in that: include: If a new demand response event occurs, obtain the response lag time of the electronic expansion valve at the end of the historical demand response event; determining, based on the response lag time, that the first strategy or the second strategy is adopted to control the opening of the electronic expansion valve when the demand response event ends, until it is determined that a control end condition is met; Wherein, the first strategy includes: controlling the opening of the electronic expansion valve to increase to a first preset opening; The second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

2. The method according to claim 1, characterized in that The adjusting the opening of the electronic expansion valve at the next time step includes: Adjusting the opening of the electronic expansion valve at the next time step based on the opening assignment relationship or the air conditioning operating parameters obtained in real time; The air conditioning operating parameters include at least one of the following: the operating frequency of the compressor, the exhaust superheat of the compressor and the low-pressure side pressure of the air conditioner; the opening assignment relationship is used to reflect the number and duration of the low-pressure side pressure dropping to the preset minimum pressure, and the mapping relationship between the opening adjustment value.

3. The method according to claim 2, characterized in that When the air-conditioning operating parameter includes the operating frequency, adjusting the opening of the electronic expansion valve at the next time step based on the air-conditioning operating parameter acquired in real time includes: Obtaining an expected operating frequency of the compressor at the next time step according to the rising speed of the operating frequency; determining an expected mass flow rate based on the expected operating frequency; According to the mapping relationship between the expected mass flow rate and the opening degree, the opening degree of the electronic expansion valve in the next time step is adjusted.

4. The method according to claim 2, characterized in that When the air conditioning operating parameter includes the exhaust gas superheat, adjusting the opening of the electronic expansion valve at the next time step based on the air conditioning operating parameter acquired in real time includes: Obtaining an exhaust superheat difference between the exhaust superheat obtained in real time and the exhaust superheat obtained in a previous time step; When the exhaust superheat difference is greater than a tolerance value, adjusting the opening of the electronic expansion valve in the next time step to be greater than the current opening of the electronic expansion valve; When the exhaust superheat difference is less than or equal to the tolerance value, the opening of the next time step is adjusted to be smaller than the current opening.

5. The method according to claim 2, characterized in that The controlling the opening of the electronic expansion valve to increase to a second preset opening comprises: Get the maximum opening and safety factor of the electronic expansion valve; The second preset opening is determined according to the maximum opening and the safety factor, and the opening of the electronic expansion valve is controlled to increase to the second preset opening.

6. The method according to any one of claims 2 to 5, characterized in that: The adjusting the opening of the electronic expansion valve at the next time step based on the opening assignment relationship or the air conditioning operation parameters obtained in real time includes: Get the decreasing speed of the low-pressure side pressure; When the decreasing speed is greater than the first speed, adjusting the opening of the electronic expansion valve in the next time step based on the exhaust gas superheat of the compressor or the low-pressure side pressure of the air conditioner; When the descending speed is less than or equal to the first speed, the opening degree of the electronic expansion valve in the next time step is adjusted based on the opening degree assignment relationship.

7. The method according to any one of claims 2 to 5, characterized in that: Determining, based on the response lag time, whether to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends includes: When the response lag time is less than the first time and greater than the second time, determining that the demand response event ends and adopting the first strategy to control the opening of the electronic expansion valve; When the time after the response is greater than or equal to the first time, it is determined that the demand response event ends and the second strategy is adopted to control the opening of the electronic expansion valve.

8. The method according to any one of claims 2 to 5, characterized in that: The determination of reaching the control end condition includes: When the low-pressure side pressure remains within the preset pressure range within the preset time period, it is determined that the control end condition has been met; The maximum pressure of the preset pressure range is obtained by fitting the operating frequency of the air conditioner during the non-demand response period, the low-pressure side pressure, and the exhaust gas superheat.

9. The method according to any one of claims 2 to 5, characterized in that: Both the first strategy and the second strategy further include: The rising speed of the operating frequency is reduced to the target speed.

10. An air conditioning control device, characterized in that: include: An acquisition module is used to obtain the response lag time of the electronic expansion valve at the end of a historical demand response event if a new demand response event occurs; a control module, which determines, based on the response lag time, when the demand response event ends, to adopt the first strategy or the second strategy to control the opening of the electronic expansion valve until it is determined that a control end condition is met; Wherein, the first strategy includes: controlling the opening of the electronic expansion valve to increase to a first preset opening; The second strategy includes: controlling the opening of the electronic expansion valve to rise to a second preset opening, and adjusting the opening of the electronic expansion valve in the next time step.

11. An electronic device, characterized in that: include: a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which, when executed, enable the computer to execute the method according to any one of claims 1 to 9.

Images