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

Abstract

The application provides an air conditioner control method and device, an electronic device, and a storage medium. The method comprises: if a new demand response event occurs, obtaining a response lag time length of an electronic expansion valve at the end time of a historical demand response event; determining whether to use a first strategy or a second strategy to control the opening degree of the electronic expansion valve at the end of the demand response event according to the response lag time length until a control end condition is determined; the first strategy comprises: controlling the opening degree of the electronic expansion valve to rise to a first preset opening degree; the second strategy comprises: controlling the opening degree of the electronic expansion valve to rise to a second preset opening degree and adjusting the opening degree of the electronic expansion valve at the next time step. The method of the application can solve the problem of how to reduce the shutdown risk of a fluorine system air conditioner caused by low pressure protection after the end of the demand response time.

Description

Technical Field

[0001] This application relates to air conditioning control technology, and more particularly to an air conditioning control method, device, electronic equipment, and storage medium. Background Technology

[0002] With the rapid development of the social economy and the continuous improvement of people's living standards, various types of air conditioners have been widely used. This widespread use has created a considerable "air conditioning load," and the rapid increase in this load can lead to many problems on the power grid side, such as widening the peak-to-valley difference, deteriorating load characteristics, and significant load spikes. To ensure the economical, safe, and stable operation of the power grid, the grid will impose power reduction demands on air conditioners to regulate their load. Correspondingly, air conditioners respond to the demand from the grid. Currently, there are two common demand responses from refrigerant-based air conditioners: one is under normal reduction conditions, where the compressor's operating frequency is forcibly reduced to 70% of its rated power; the other is under strict reduction conditions, where the compressor's operating frequency is forcibly reduced to 40% of its rated power.

[0003] However, at the end of the demand response, the air conditioner switches from demand response control mode to free control (PI control) mode, causing the compressor to increase its frequency extremely rapidly. The timing of the electronic expansion valve's action is constrained by factors such as the air conditioner's piping length, electrical control delay time, and temperature sensing signal transmission. The valve's ability to sense 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, the rapid frequency increase of the compressor causes a rapid drop in the air conditioner's low-pressure side pressure. If the electronic expansion valve does not increase its opening in time, the low-pressure side pressure will be even lower. Excessively low low-pressure side pressure triggers the air conditioner's low-pressure protection, causing the air conditioner to shut down and malfunction.

[0004] Therefore, how to reduce the risk of air conditioning system shutdown due to low pressure protection after the demand response time ends is still a matter that needs to be considered. Summary of the Invention

[0005] This application provides an air conditioning control method, device, electronic equipment, and storage medium to solve the problem of how to reduce the risk of air conditioning system shutdown due to low pressure protection after the demand response time ends.

[0006] On the one hand, this application provides an air conditioning control method, including:

[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] Based on the response lag time, determine whether to use the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends, until the control termination condition is determined to be met.

[0009] The first strategy includes: controlling the opening of the electronic expansion valve to rise 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 degree of the electronic expansion valve at the next time step includes:

[0012] The opening degree of the electronic expansion valve is adjusted in the next time step based on the opening degree assignment relationship or the air conditioner operating parameters obtained in real time.

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

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

[0015] Based on the rate of increase of the operating frequency, the expected operating frequency of the compressor in the next time step is obtained;

[0016] Determine the expected quality flow rate based on the expected operating frequency;

[0017] Based on the mapping relationship between the expected mass flow rate and the opening degree, adjust the opening degree of the electronic expansion valve at the next time step.

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

[0019] Obtain the difference between the real-time exhaust superheat and the exhaust superheat obtained in the previous time step;

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

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

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

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

[0024] The second preset opening degree is determined based on the maximum opening degree and the safety factor, and the opening degree of the electronic expansion valve is controlled to rise to the second preset opening degree.

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

[0026] Obtain the rate of decrease of the low-pressure side pressure;

[0027] When the descent rate is greater than the first rate, the opening of the electronic expansion valve is adjusted in the next time step based on the compressor's exhaust superheat or the air conditioning low-pressure side pressure.

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

[0029] In one embodiment, determining whether to use a first strategy or a second strategy to control the opening of the electronic expansion valve at the end of the demand response event based on the response lag duration includes:

[0030] When the response lag time is less than the first time and greater than the second time, the first strategy is used to control the opening of the electronic expansion valve when the demand response event ends.

[0031] When the duration following the response is greater than or equal to the first duration, a second strategy is used to control the opening of the electronic expansion valve when the demand response event is determined to have ended.

[0032] In one embodiment, determining that the control termination condition has been met includes:

[0033] When the low-pressure side pressure remains within the preset pressure range for a preset duration, the control termination condition is determined to be met.

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

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

[0036] Reduce the rate of increase of the operating frequency to the target speed.

[0037] On the other hand, this application provides an air conditioning control device, including:

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

[0039] The control module determines, based on the response lag time, whether to use a first strategy or a second strategy to control the opening of the electronic expansion valve when the demand response event ends, until the control termination condition is determined to be met.

[0040] The first strategy includes: controlling the opening of the electronic expansion valve to rise 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, this application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0043] The memory stores computer-executed instructions;

[0044] The processor executes computer execution instructions stored in the memory to implement the method as described in the first aspect.

[0045] On the other hand, this application provides a computer-readable storage medium storing computer-executable instructions that, when executed, cause a computer to perform the method described in the first aspect.

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

[0047] In summary, the air conditioning control method provided by the embodiments of this application includes: if a new demand response event occurs, obtaining the response lag time of the electronic expansion valve at the end time of a historical demand response event; and determining, based on the response lag time, controlling the opening degree of the electronic expansion valve using a first strategy or a second strategy when the demand response event ends, until the control termination condition is determined to be met. The first strategy includes: controlling the opening degree of the electronic expansion valve to rise to a first preset opening degree. The second strategy includes: controlling the opening degree of the electronic expansion valve to rise to a second preset opening degree, and adjusting the opening degree of the electronic expansion valve in the next time step.

[0048] In other words, the opening of the air conditioner's electronic expansion valve is increased in advance, or the opening is further adjusted and increased continuously, to prevent the low-pressure protection from being triggered due to insufficient opening of the electronic expansion valve. This reduces the risk of the refrigerant system air conditioner shutting down due to low-pressure protection after the demand response time ends. Attached Figure Description

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

[0050] Figure 1 A schematic diagram of compressor frequency increase provided in this application;

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

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

[0053] Figure 4 A schematic diagram illustrating the change in exhaust superheat in an air conditioning control method provided in one embodiment of this application;

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

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

[0056] Figure 7 A schematic diagram illustrating the change in exhaust superheat in an air conditioning control method provided in another embodiment of this application;

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

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

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

[0060] Figure 11 A schematic diagram illustrating the change in exhaust superheat in an air conditioning control method provided in another embodiment of this application;

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

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

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

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

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

[0066] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0067] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this 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 construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0069] First, let's explain the terms used in this application:

[0070] Exhaust superheat: The temperature difference between the compressor exhaust pipe and the saturation temperature corresponding to the actual condensing pressure. It refers to the difference in temperature between the current actual temperature and the saturation temperature corresponding to the actual pressure. Exhaust superheat = Exhaust temperature - Saturation temperature corresponding to exhaust pressure.

[0071] With the rapid development of the social economy and the continuous improvement of people's living standards, various types of air conditioners have been widely used. This widespread use has created a considerable "air conditioning load," and the rapid increase in this load can lead to many problems on the power grid side, such as widening the peak-to-valley difference, deteriorating load characteristics, and significant load spikes. To ensure the economical, safe, and stable operation of the power grid, the grid will impose power reduction demands on air conditioners to regulate their load. Correspondingly, air conditioners respond to the demand from the grid. Currently, there are two common demand responses from refrigerant-based air conditioners: one is under normal reduction conditions, where the compressor's operating frequency is forcibly reduced to 70% of its rated power; the other is under strict reduction conditions, where the compressor's operating frequency is forcibly reduced to 40% of its rated power.

[0072] Please 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) mode, resulting in an extremely rapid increase in compressor frequency. The timing of the electronic expansion valve's action is constrained by factors such as the length of the air conditioner's piping, the delay time of the electronic control, and the transmission of temperature sensing signals. The time it takes for the valve body to sense the superheat of the compressor's exhaust is always later than the compressor's frequency increase response time at the end of the demand response.

[0073] In other words, at the end of the demand response period, the rapid increase in compressor frequency causes a rapid drop in the low-pressure side pressure of the air conditioner. If the electronic expansion valve does not increase its opening in time, the low-pressure side pressure will be even lower. Excessively low low-pressure side pressure will trigger the air conditioner's low-pressure protection. Taking a strict demand response event as an example, during the demand response event, the compressor frequency of the refrigerant-based air conditioner is limited to low frequency operation. At this time, the opening of the electronic expansion valve, which is controlled by detecting the compressor's exhaust superheat, is relatively small. However, at the end of the demand response event, the rapid compressor action causes a rapid drop in low-pressure side pressure, and the electronic expansion valve does not increase its opening in time, resulting in excessively low low-pressure side pressure and triggering low-pressure protection.

[0074] Low-pressure protection can easily cause air conditioners to shut down and malfunction, affecting their normal use. Therefore, reducing the risk of shutdown due to low-pressure protection in refrigerant-based air conditioners after the demand response time ends remains a consideration.

[0075] Based on this, this application provides an air conditioning control method, apparatus, electronic device, and storage medium. The air conditioning control method includes: if a new demand response event occurs, acquiring the response lag time of an electronic expansion valve at the end of a historical demand response event; based on the response lag time, determining whether to use a first strategy or a second strategy to control the opening degree of the electronic expansion valve when the demand response event ends, until a control termination condition is determined to be met. The first strategy includes: controlling the opening degree of the electronic expansion valve to increase to a first preset opening degree. The second strategy includes: controlling the opening degree of the electronic expansion valve to increase to a second preset opening degree, and adjusting the opening degree of the electronic expansion valve in the next time step.

[0076] In other words, the opening of the air conditioner's electronic expansion valve is increased in advance, or the opening is further adjusted and increased continuously, to prevent the low-pressure protection from being triggered due to insufficient opening of the electronic expansion valve. This reduces the risk of the refrigerant system air conditioner shutting down due to low-pressure protection after the demand response time ends.

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

[0078] Please see Figure 2 One embodiment of this application provides an air conditioning control method, including:

[0079] S210, 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.

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

[0081] The demand response event refers to the event that occurs in response to a reduction in power demand on the grid side. During the occurrence of the demand response event, the compressor reduces its operating frequency, i.e., compressor frequency reduction. After the demand response event ends, the compressor rapidly increases its operating frequency, i.e., compressor frequency increase. Specifically, at the end of the demand response event, the air conditioner switches from demand response control mode to free control (PI control) mode, resulting in an extremely rapid compressor frequency increase rate. However, the timing of the electronic expansion valve's action is constrained by factors such as the length of the air conditioner's piping, electronic control delay events, and temperature sensing signal transmission. The time it takes for the valve to sense the compressor's overheating is always delayed compared to the compressor's frequency increase response time at the end of the demand response event. This delay between the electronic expansion valve and the compressor's frequency increase response time is referred to as the response lag time in this embodiment.

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

[0083] S220, based on the response lag time, determine whether to use the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends, until the control termination condition is determined to be met.

[0084] Different response lag times correspond to different strategies. It is understandable that the longer the response lag time, the more necessary it is to interfere with the opening of the electronic expansion valve. The purpose of the interference is to prevent the low-pressure side voltage of the air conditioner from triggering the low-pressure protection of the air conditioner, that is, to prevent the low-pressure side voltage of the air conditioner from becoming too low.

[0085] In an optional embodiment, when the response lag time is less than a first time and greater than a second time, a first strategy is used to control the opening degree of the electronic expansion valve when the demand response event is determined to have ended. The first strategy includes controlling the opening degree of the electronic expansion valve to rise to a first preset opening degree.

[0086] Please see Figure 3 , Figure 3 In this context, t1 represents the time for setting the electronic expansion valve opening, and t2 represents the end time of the demand response event. That is, a fixed opening is set for the electronic expansion valve during or before the demand response event occurs; specifically, this first preset opening is set so that the opening of the electronic expansion valve increases after the demand response event ends. Please refer to [link to relevant documentation]. Figure 4 If the value of the first preset opening is reasonable, then for a period of time after the demand response event ends, the compressor's discharge superheat (SH) will decrease from the allowable lower limit SH. low To the maximum allowable value SH high Changes. When the refrigerant cycle stabilizes, the exhaust superheat SH will also change from the allowable upper limit SH. high Gradually move towards the normal value SH of PI control PI The pressure changes continue until it stabilizes. The trend of low-pressure side pressure changes in the air conditioner is as follows: Figure 5 As shown.

[0087] It should be noted that the first preset opening degree can vary for different air conditioners. The slower the electronic expansion valve transmits signals, the larger the first preset opening degree. When the first preset opening degree is large enough, reaching its limit, it will undoubtedly threaten the compressor's exhaust superheat, causing the exhaust superheat to decrease. If the electronic expansion valve opening is increased to its maximum value, it still cannot maintain the exhaust superheat during the compressor's frequency increase process within the allowable limit SH. highIf so, it means that the first strategy is no longer applicable to the control of the air conditioner.

[0088] Optionally, the first strategy also includes reducing the rate of increase of the operating frequency to the target speed. That is, reducing the rate of increase of the compressor's operating frequency from a Hz / min to b Hz / min, so that the compressor's operating frequency changes from a rapid increase to a slow increase. This allows the electronic expansion valve more response time.

[0089] In an optional embodiment, when the duration following the response is greater than or equal to the first duration, a second strategy is employed to control the opening of the electronic expansion valve upon determining the end of the demand response event. This 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 in the next time step.

[0090] Specifically, firstly, within the time frame 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. The boundary conditions of this allowable range include, but are not limited to, the upper and lower limits of refrigerant mass flow rate, the upper and lower limits of system superheat, and the maximum opening limit of the electronic expansion valve.

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

[0092] Secondly, the opening degree of the electronic expansion valve is adjusted in the next time step to prevent the low-pressure side pressure of the air conditioner from triggering low-pressure protection due to excessively low pressure. This adjustment includes increasing or decreasing. Before the air conditioner enters free control mode, the opening degree 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 triggering low-pressure protection due to excessively low pressure. Optionally, the opening degree 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 degree of the electronic expansion valve in the next time step can be adjusted based on the compressor frequency. Optionally, the opening degree 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, such as the number of times the air conditioner's low-pressure side pressure bottoms out and the duration of bottoming out.

[0093] In an optional embodiment, the opening degree of the electronic expansion valve in the next time step is adjusted based on real-time acquired air conditioning operating parameters. These operating parameters include the compressor's operating frequency. Specifically, based on the rate of increase of this 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, the expected mass flow rate is determined based on this expected operating frequency, for example, the expected mass flow rate is Q. m Based on the mapping relationship between the expected mass flow rate and the opening degree, the opening degree of the electronic expansion valve is adjusted in the next time step.

[0094] When determining the expected mass flow rate based on the expected operating frequency, firstly, according to formula Q... AC =bf+c or formula Q AC =af 2 The expected cooling capacity of the air conditioner is determined by the formula +bf+c, where f represents the expected operating frequency of the compressor, and Q... AC This represents the expected cooling capacity of the air conditioner. a, b, and c are constant coefficients obtained by fitting historical or measured data. Furthermore, according to the formula Q... AC =q·Q m Determine the expected mass flow rate, where Q AC Q represents the expected cooling capacity, where q represents the cooling capacity per unit mass of refrigerant. m This represents the expected quality flow rate. Once the expected quality flow rate is determined, it is calculated using the formula... Determine the opening degree of the electronic expansion valve in the next time step, where Q m F0 represents the expected mass flow rate, 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 degree of the electronic expansion valve in the next time step can be determined based on the mapping relationship between the expected operating frequency and the opening degree of the electronic expansion valve. Specifically, the mapping relationship between the expected operating frequency and the opening degree of the electronic expansion valve is F = f(f), where F represents the opening degree of the electronic expansion valve and f represents the expected operating frequency.

[0096] The mapping relationship F = f(f) between the expected operating frequency and the opening degree of the electronic expansion valve can be obtained by fitting equations 1 to 4. Equation 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. Where Q AC represents the air conditioning cooling capacity, f represents the compressor operating frequency, and a, b, and c are constant coefficients obtained by fitting historical or measured data. Q m ρ represents mass flow rate, q represents the cooling capacity per unit mass of refrigerant, F0 represents the opening degree 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 number of pole pairs, and s represents the slip rate.

[0097] Optionally, the second strategy also includes reducing the rate of increase of the operating frequency to the target speed. That is, reducing the rate of increase of the compressor's operating frequency from a Hz / min to b Hz / min, so that the compressor's operating frequency changes from a rapid increase to a slow increase. This allows the electronic expansion valve more response time.

[0098] In summary, different response lag times correspond to different strategies. When the response lag time is short, the first strategy can be used to control the electronic expansion valve; when the response lag time is long, the second strategy can be used. Using either the first or second strategy to control the electronic expansion valve will prevent the low-pressure side voltage of the air conditioner from triggering its low-pressure protection, thus preventing the low-pressure side voltage from becoming too low and reducing the risk of the air conditioner shutting down due to low-pressure protection.

[0099] The opening degree of the electronic expansion valve is controlled using either a first strategy or a second strategy. When the control termination condition is met, control of the electronic expansion valve's opening degree is stopped. The control termination condition refers to the air conditioner switching from demand response control mode to free control mode (PI mode). Optionally, the control termination condition is determined to be met when the low-pressure side pressure remains within a preset pressure range for a preset duration. The maximum pressure within this preset pressure range is obtained by fitting the air conditioner's operating frequency, low-pressure side pressure, and exhaust superheat during non-demand response periods. The control termination condition can also be other conditions, such as the compressor's exhaust superheat fluctuating within a preset exhaust superheat range, or the compressor's operating frequency fluctuating within a preset frequent operating range. This embodiment does not specifically limit the control termination condition.

[0100] In an optional embodiment, when the response hysteresis time of the electronic expansion valve is very short, for example, when the response hysteresis time is less than or equal to the second duration, no excessive intervention is required; the opening degree of the electronic expansion valve is controlled solely based on its own superheat control logic. In this case, the opening degree change of the electronic expansion valve is as follows: Figure 6 As shown, the trend of exhaust superheat is as follows: Figure 7 As shown, the pressure variation trend on the low-pressure side is as follows: Figure 8 As 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 time of the electronic expansion valve at the end time of a historical demand response event; based on the response lag time, determining whether to use a first strategy or a second strategy to control the opening degree of the electronic expansion valve when the demand response event ends, until the control termination condition is determined to be met. The first strategy includes: controlling the opening degree of the electronic expansion valve to rise to a first preset opening degree. The second strategy includes: controlling the opening degree of the electronic expansion valve to rise to a second preset opening degree, and adjusting the opening degree of the electronic expansion valve in the next time step.

[0102] In other words, the opening of the air conditioner's electronic expansion valve is increased in advance, or the opening is further adjusted and increased continuously, to prevent the low-pressure protection from being triggered due to insufficient opening of the electronic expansion valve. This reduces the risk of the refrigerant system air conditioner shutting down due to low-pressure protection after the demand response time ends.

[0103] Please see Figure 9 One embodiment of this application provides an air conditioning control method, including:

[0104] S910, 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.

[0105] For a detailed description of this step, please refer to the relevant description of step S210 in the above embodiments, which will not be repeated here.

[0106] S920, based on the response lag time, determine the end of the demand response event and use the second strategy to control the opening of the electronic expansion valve until the control termination condition is met. The second strategy is: control the opening of the electronic expansion valve to rise to a second preset opening, and adjust the opening of the electronic expansion valve in the next time step based on the opening assignment relationship.

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

[0108] In an 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 in the next time step is adjusted based on the compressor's exhaust superheat or the air conditioning 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 in the next time step is adjusted based on the opening assignment relationship. That is, 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 mode of the opening of the electronic expansion valve when the pressure on the low-pressure side drops slowly.

[0110] Please refer to Figure 10 , Figure 11 and Figure 12 , first, before the demand response event ends, the second preset opening A is set, so that the low-pressure side pressure P at the moment when the demand response ends DR is close to the allowable upper limit value P of the low-pressure side pressure max , or the discharge superheat SH of the compressor is close to the minimum allowable discharge superheat SH min . Wherein, the allowable upper limit value P of the low-pressure side pressure max can be obtained by fitting based on the existing hourly frequency, pressure data and discharge superheat data of the compressor in the conventional operation mode. As an example, the target discharge superheat SH aim is 25°C, with an acceptable range of 22 to 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 can be approximately fitted as the fitted line of the allowable upper limit value P of the low-pressure side pressure max , or a specific reasonable value within the range of 22°C<SH<27°C for the discharge superheat can be simplified as the allowable upper limit value P of the low-pressure side pressure max .

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

[0112] Specifically, after the demand response event ends, the low-pressure side pressure P of the air conditioner will be monitored frequently. DR When the low-pressure side pressure approaches the lower limit of the low-pressure side allowable pressure P min At that time, or when the compressor's discharge superheat SH is close to the minimum permissible compressor discharge superheat SH min At that time, the electronic expansion valve opening degree A+x1 is assigned to make the system low-pressure side pressure close to the upper limit of the low-pressure side allowable pressure P. max Continuing to monitor the electronic expansion valve after assigning the opening degree, as the compressor's operating frequency increases, the low-pressure side pressure gradually approaches the lower limit of the low-pressure side allowable pressure P. min The opening degree of the electronic expansion valve is reassigned to A+x1+x2, so that the low-pressure side pressure approaches the upper limit of the low-pressure side allowable pressure P. max This process repeats until, after a certain opening value is assigned, the low-pressure side pressure no longer approaches the lower limit of the low-pressure side allowable pressure P. min Instead, P fluctuates within a reasonable range. min <P DR <P max This indicates that the opening degree of the electronic expansion valve is close to the low-pressure side pressure control P in free control mode. PI The corresponding electronic expansion valve opening can be switched to a free control mode.

[0113] N times under a single bottom P_Pmin Pressure bottoming time T P_Pmin The length of time it takes for the refrigerant to bottom out essentially corresponds to the impact of different environmental conditions on the refrigerant cycle performance. Taking heating as an example, the more severe the external conditions (cold), the worse the refrigerant cycle performance, the higher its fluid viscosity, and the more unfavorable the cycle. Considering different pressure bottoming times T... P_Pmin Number of times the bottom is reached (N) P_Pmin Under operating conditions, the lower limit of the allowable pressure P on the low-pressure side needs to be adjusted. min Adjust to the upper limit of the allowable pressure P on the low-pressure side max The required opening degrees of the electronic expansion valve under operating conditions are x1, x2, ..., x. n Assign a value. That is, determine N based on experiments for different numbers of bottoming out. P_Pmin The pressure bottoming time T under this operating condition P_Pmin and valve opening degree x1, x2, ..., x n The relationship.

[0114] The opening degree assignment relationship can be represented by the assignment tables shown in Table 1 and Table 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 thereafter. Table 2 shows the relationship between the corresponding opening degree adjustment value and the duration thereafter 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 number of bottoming-out cycles is relatively small. The prerequisites for adjusting the real-time opening of the electronic expansion valve based on the opening assignment relationship include: the air conditioning piping length remains unchanged, the initial operating frequency of different compressors is already determined, the compressor's operating frequency rise rate is fixed, and there are no sudden changes in the indoor and outdoor environments.

[0120] S930, based on the response lag time, determine that when the demand response event ends, use a second strategy to control the opening of the electronic expansion valve until the control termination condition is met. The second strategy is: control the opening of the electronic expansion valve to rise to a second preset opening, and adjust the opening of the electronic expansion valve in the next time step based on the real-time acquired air conditioning operating parameters.

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

[0122] For details on how to adjust the opening degree of the electronic expansion valve in the next time step according to the operating frequency of the compressor, please refer to the relevant description in the above embodiments, which will not be repeated here.

[0123] In an optional embodiment, the rate of decrease of the low-pressure side pressure is obtained. When the rate of decrease exceeds a first rate, the opening of the electronic expansion valve is adjusted in the next time step based on the compressor's exhaust superheat or the air conditioner's low-pressure side pressure. That is, when the low-pressure side pressure decreases too quickly, the opening of the electronic expansion valve is adjusted in real time using data measured in real time 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 degree A is set so that the low-pressure side pressure P at the time the demand response ends is... DR Approaching the upper limit of the allowable pressure P on the low-pressure sidemax , or make the discharge superheat SH of the compressor close to the minimum allowable discharge superheat SH min .

[0126] Low-pressure side allowable upper pressure limit value P max can be obtained by fitting based on the existing hourly frequency, pressure data and discharge superheat data of the compressor under the conventional operation mode. For example, the target discharge superheat SH aim is 25°C, with an acceptable range of 22 to 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 can be approximately fitted as the low-pressure side allowable upper pressure limit value P max fitting line, or a specific reasonable value within the range of 22°C<SH<27°C of the discharge superheat can be simplified as the low-pressure side allowable upper pressure limit value P max .

[0127] After the demand response event ends, the low-pressure side pressure P is detected DR , when the low-pressure side pressure P DR approaches the low-pressure side allowable lower pressure limit value P min , the opening of the electronic expansion valve is assigned as A+X. The low-pressure side allowable lower pressure limit value P of different air conditioners min generally has a specific limit value in the research and development stage, for example, 0.07Mpa. 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 fluctuation will approach the low-pressure side allowable lower pressure limit value P for many times min , if the assignment of X is too large, the pressure will deviate toward the low-pressure side allowable upper pressure limit value P max , so the set value of X should be reasonably determined based on the measured data from the previous research and development, so as to minimize the number N of times the low-pressure side pressure drops to the preset minimum pressure as much as possible P_Pmin .

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

[0129] Please refer to Figure 13 which is a schematic diagram showing the variation trend of the low-pressure side pressure when the adjustment value X is on the high side. Figure 14 This diagram illustrates the pressure variation trend on the low-pressure side when adjustment X is low. To better reduce the risk of triggering low-pressure protection, the value of adjustment X needs to be determined more accurately.

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

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

[0132] Optionally, the adjustment value X of the opening can be determined based on the real-time low-pressure side pressure, or the opening can be adjusted to X based on other parameters. This embodiment does not impose too many limitations.

[0133] In summary, when determining the control degree of the electronic expansion valve using this second strategy, the opening degree of the electronic expansion valve in the next time step is adjusted based on the opening degree assignment relationship or the real-time acquired air conditioning operating parameters. When the low-pressure side pressure drops too quickly, the opening degree of the electronic expansion valve in the next time step is adjusted based on the acquired air conditioning operating parameters. When the low-pressure side pressure drops slowly, the opening degree of the electronic expansion valve in the next time step is adjusted based on the opening degree assignment relationship. The time step can be set according to actual needs, and this embodiment does not limit it. 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 a historical demand response event. Based on the response lag time, determining that the opening degree of the electronic expansion valve is controlled using a second strategy when the demand response event ends, until the control termination condition is determined to be met. The second strategy is: controlling the opening degree of the electronic expansion valve to rise to a second preset opening degree, and adjusting the opening degree of the electronic expansion valve in the next time step based on the opening degree assignment relationship. Based on the response lag time, determining that the opening degree of the electronic expansion valve is controlled using a second strategy when the demand response event ends, until the control termination condition is determined to be met. The second strategy is: controlling the opening degree of the electronic expansion valve to rise to a second preset opening degree, and adjusting the opening degree of the electronic expansion valve in the next time step based on the real-time acquired air conditioning operating parameters.

[0135] That is, when determining the control of the electronic expansion valve opening using this second strategy, the opening of the electronic expansion valve in the next time step is adjusted based on the opening assignment relationship or real-time acquired air conditioning operating parameters. When the low-pressure side pressure drops too quickly, the opening of the electronic expansion valve in the next time step is adjusted based on the acquired air conditioning operating parameters. When the low-pressure side pressure 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. Thus, the risk of shutdown of the refrigerant system air conditioning due to low-pressure protection after the demand response time ends is reduced.

[0136] Please see Figure 15 An embodiment of this application also provides an air conditioning control device 10, comprising:

[0137] The acquisition module 11 is used to acquire 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.

[0138] The control module 12 is used to determine, based on the response lag time, the opening degree of the electronic expansion valve to be controlled by a first strategy or a second strategy when the demand response event ends, until the control termination condition is determined to be met.

[0139] The first strategy includes: controlling the opening of the electronic expansion valve to rise 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 degree of the electronic expansion valve in the next time step based on the opening degree 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 degree assignment relationship is used to reflect the mapping relationship between the number of times and the duration of the low-pressure side pressure dropping to the preset minimum pressure and the opening degree adjustment value.

[0142] Optionally, the control module 12 is specifically used for: when the air conditioner operating parameters include the operating frequency, obtaining the expected operating frequency of the compressor in the next time step based on the rising rate of the operating frequency; determining the expected mass flow rate based on the expected operating frequency; and adjusting the opening degree of the electronic expansion valve in the next time step based on the mapping relationship between the expected mass flow rate and the opening degree.

[0143] Optionally, the control module 12 is specifically used for: when the air conditioner operating parameters include the exhaust superheat, acquiring the difference between the real-time exhaust superheat and the exhaust superheat acquired in the previous time step; when the exhaust superheat difference is greater than the 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, adjusting the opening of the next time step to be less than the current opening.

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

[0145] Optionally, the control module 12 is specifically used to: obtain the rate of decrease of the low-pressure side pressure; when the rate of decrease is greater than a first rate, adjust the opening of the electronic expansion valve in the next time step based on the compressor's exhaust superheat or the air conditioner's low-pressure side pressure; when the rate of decrease is less than or equal to the first rate, 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 a first time and greater than a second time, determine that the opening degree of the electronic expansion valve is controlled by a first strategy when the demand response event ends; and when the time after the response is greater than or equal to the first time, determine that the opening degree of the electronic expansion valve is controlled by a second strategy when the demand response event ends.

[0147] Optionally, the control module 12 is specifically used to: determine that the control termination condition has been reached when the low-pressure side pressure remains within the preset pressure range for a preset duration; wherein, the maximum pressure of the preset pressure range is obtained by fitting the air conditioner's operating frequency, the low-pressure side pressure, and the exhaust superheat during non-demand response periods.

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

[0149] The air conditioning control device provided in this application embodiment can execute the air conditioning control method in the above method embodiment. Its implementation principle and technical effects are similar, and will not be repeated here. It should be noted that the above... Figure 15 The division of modules shown is merely illustrative. This application does not limit the division of modules or the naming of modules.

[0150] Please see Figure 16 One embodiment of this application also provides an electronic device 20, including a processor 21 and a memory 22 communicatively connected to 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 preceding embodiments.

[0151] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed, cause the computer-executable instructions to be executed by a processor to implement the air conditioning control method provided in any of the preceding embodiments.

[0152] This application also provides a computer program product, including a computer program that, when executed by a processor, is used to implement the air conditioning control method as provided in any of the preceding embodiments.

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

[0154] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0155] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0156] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they 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 this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0157] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0158] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0159] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0160] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this 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; Based on the response lag time, determine whether to use the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends, until the control termination condition is determined to be met. The first strategy includes: controlling the opening of the electronic expansion valve to rise 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 adjustment of the opening degree of the electronic expansion valve in the next time step includes: The opening degree of the electronic expansion valve is adjusted in the next time step based on the opening degree assignment relationship or the air conditioner operating parameters obtained in real time. The air conditioning operating parameters include at least one of the following: compressor operating frequency, compressor exhaust superheat, and air conditioning low-pressure side pressure; the opening degree assignment relationship is used to reflect the mapping relationship between the number of times and the duration of the low-pressure side pressure dropping to the preset minimum pressure and the opening degree adjustment value.

3. The method according to claim 2, characterized in that, When the air conditioner operating parameters include the operating frequency, adjusting the opening degree of the electronic expansion valve in the next time step based on the real-time acquired air conditioner operating parameters includes: Based on the rate of increase of the operating frequency, the expected operating frequency of the compressor in the next time step is obtained; Determine the expected quality flow rate based on the expected operating frequency; Based on the mapping relationship between the expected mass flow rate and the opening degree, adjust the opening degree of the electronic expansion valve at the next time step.

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

5. The method according to claim 2, characterized in that, The control of the electronic expansion valve to increase its opening to the second preset opening includes: Obtain the maximum opening degree and safety factor of the electronic expansion valve; The second preset opening degree is determined based on the maximum opening degree and the safety factor, and the opening degree of the electronic expansion valve is controlled to rise to the second preset opening degree.

6. The method according to any one of claims 2-5, characterized in that, The adjustment of the electronic expansion valve's opening degree in the next time step based on the opening degree assignment relationship or real-time acquired air conditioning operating parameters includes: Obtain the rate of decrease of the low-pressure side pressure; When the descent rate is greater than the first rate, the opening of the electronic expansion valve is adjusted in the next time step based on the compressor's exhaust superheat or the air conditioning low-pressure side pressure. When the descent speed is less than or equal to the first speed, the opening of the electronic expansion valve is adjusted in the next time step based on the opening assignment relationship.

7. The method according to any one of claims 2-5, characterized in that, The step of determining whether to use the first strategy or the second strategy to control the opening of the electronic expansion valve when the demand response event ends, based on the response lag time, includes: When the response lag time is less than the first time and greater than the second time, the first strategy is used to control the opening of the electronic expansion valve when the demand response event ends. When the duration following the response is greater than or equal to the first duration, a second strategy is used to control the opening of the electronic expansion valve when the demand response event is determined to have ended.

8. The method according to any one of claims 2-5, characterized in that, The conditions for determining when control termination has been met include: When the low-pressure side pressure remains within the preset pressure range for a preset duration, the control termination condition is determined to be met. The maximum pressure within the preset pressure range is obtained by fitting the operating frequency of the air conditioner during non-demand response periods, the low-pressure side pressure, and the exhaust superheat.

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

10. An air conditioning control device, characterized in that, include: The acquisition module is used to acquire the response lag time of the electronic expansion valve at the end of the historical demand response event if a new demand response event occurs. The control module determines, based on the response lag time, whether to use a first strategy or a second strategy to control the opening of the electronic expansion valve when the demand response event ends, until the control termination condition is determined to be met. The first strategy includes: controlling the opening of the electronic expansion valve to rise 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-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in 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 that, when executed, cause the computer to perform the method as described in any one of claims 1-9.

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