Oil return control methods, devices, energy-saving air conditioning units, equipment and storage media

Abstract

This application relates to an oil return control method, apparatus, energy-saving air conditioning unit, equipment, and storage medium. The method includes: determining the power generation data of the photovoltaic power generation equipment in a future time period based on acquired environmental data of the photovoltaic power generation equipment's location; determining the corresponding oil return time window for the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in the future time period; determining the unit's oil return time and parameters within the oil return time window based on the air conditioning unit's operating data when the oil return time window arrives; and controlling the air conditioning unit to perform the unit's oil return operation according to the unit's oil return parameters when the unit's oil return time arrives. This application achieves matching between the unit's oil return operation and the photovoltaic power generation, avoiding the risk of oil return failure caused by insufficient photovoltaic power generation, while improving the utilization rate of photovoltaic energy and the stability of system operation, thus achieving energy saving and energy efficiency improvement.

Description

Technical Field

[0001] This application relates to the field of Internet of Things (IoT) technology, and in particular to a method, apparatus, energy-saving air conditioning unit, equipment, and storage medium for oil return control. Background Technology

[0002] In photovoltaic (PV) multi-split air conditioning systems, oil return is often performed at fixed time intervals. For example, based on the continuous operating time of the PV multi-split system, an oil return operation is performed once every preset period of continuous operation. However, this fixed-time oil return method does not consider factors such as changes in sunlight intensity, seasonal changes, and regional differences in sunlight. This is because PV power generation is intermittent and fluctuating due to the influence of sunlight. If the oil return operation is initiated when PV power is insufficient, the PV power cannot meet the high-frequency power requirements of the oil return operation, leading to oil return failure. For example, in winter when sunlight is weak or in high-latitude regions with short daylight hours, the PV power reserve is insufficient. If the oil return timing is not properly scheduled, the system may fail to initiate oil return, potentially causing compressor oil shortage or liquid slugging. Summary of the Invention

[0003] This application provides a method, apparatus, energy-saving air conditioning unit, equipment, and storage medium for oil return control, in order to solve the problem that the current oil return method using fixed time intervals does not take into account the sunlight factor. If the oil return operation is started when the photovoltaic power is insufficient, the high-frequency power demand of the oil return operation will be insufficient, resulting in oil return failure.

[0004] To address the aforementioned technical problems, the technical solution of this application is provided through the following embodiments:

[0005] This application provides an oil return control method, comprising: determining the power generation data of the photovoltaic power generation equipment in a future time period based on the environmental data of the location of the photovoltaic power generation equipment; determining the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in the future time period; wherein, the oil return time window refers to the time interval in which the maximum power generation is located; when the oil return time window arrives, determining the unit oil return time and unit oil return parameters of the air conditioning unit in the oil return time window based on the operating data of the air conditioning unit; when the unit oil return time arrives, controlling the air conditioning unit to perform unit oil return operation according to the unit oil return parameters.

[0006] Specifically, when the oil return time window arrives, determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the unit's operating data includes: when the oil return time window arrives, determining the oil return operating power and the previous oil return time of the air conditioning unit based on the unit's operating data; determining the continuous operating duration of the air conditioning unit after the previous oil return operation based on the previous oil return time; and determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the oil return operating power, the continuous operating duration of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window.

[0007] Specifically, determining the oil return time and parameters of the air conditioning unit within the oil return time window based on the oil return operating power of the air conditioning unit, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window includes: if the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, and the continuous operating time of the air conditioning unit is greater than or equal to a preset oil return interval, then determining the oil return time as the current time and determining the oil return parameters as preset standard oil return parameters.

[0008] The step of determining the unit oil return time and unit oil return parameters within the oil return time window based on the oil return operating power of the air conditioning unit, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window includes: if the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, and the continuous operating time of the air conditioning unit is less than a preset oil return interval and greater than or equal to a preset time tolerance, then the unit oil return time is determined to be the maximum value time of the oil return time window, and the unit oil return parameters are determined to be preheating oil return parameters; wherein the operating power in the preheating oil return parameters is less than the oil return operating power.

[0009] The step of determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the oil return operating power of the air conditioning unit, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window includes: determining the power generation change trend within the next adjacent time window when the maximum power generation within the oil return time window is less than the oil return operating power of the air conditioning unit; and when the maximum power generation within the next adjacent time window is less than the oil return operating power of the air conditioning unit. If the power generation trend in the next adjacent time window is upward, the unit oil return time is determined to be the time when the continuous operating time of the air conditioning unit reaches the oil return interval, and the unit oil return parameter is determined to be the preheating oil return parameter; if the power generation trend in the next adjacent time window is not upward, the unit oil return time is determined to be the current time, and the unit oil return parameter is determined to be the cooling oil return parameter; wherein, the operating power in the preheating oil return parameter is less than the oil return operating power; and, the operating power in the cooling oil return parameter is less than the oil return operating power.

[0010] Before the oil return time of the unit, the process includes: detecting the compressor discharge temperature of the air conditioning unit; opening the subcooling solenoid valve in the air conditioning unit when the compressor discharge temperature is greater than a preset discharge temperature threshold; and increasing the opening of the subcooling electronic expansion valve in the air conditioning unit according to a preset gradient value until the compressor discharge temperature is detected to be less than or equal to the discharge temperature threshold.

[0011] This application embodiment also provides an oil return control device, including: a first determining module, used to determine the power generation data of the photovoltaic power generation equipment in a future time period based on the environmental data of the location of the photovoltaic power generation equipment; a second determining module, used to determine the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in the future time period; wherein, the oil return time window refers to the time interval where the maximum power generation is located; a third determining module, used to determine the unit oil return time and unit oil return parameters of the air conditioning unit in the oil return time window based on the operating data of the air conditioning unit when the oil return time window arrives; and an oil return control module, used to control the air conditioning unit to perform unit oil return operation according to the unit oil return parameters when the unit oil return time arrives.

[0012] This application also provides an energy-saving air conditioning unit, wherein the energy-saving air conditioning unit applies the oil return control method described in any of the above claims.

[0013] This application embodiment also provides a return oil control device, including: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the processor is configured to execute a return oil control program stored in the memory to implement the return oil control method described in any of the above claims.

[0014] This application also provides a computer-readable storage medium storing computer-executable instructions, which are executed to implement the oil return control method described in any of the above claims.

[0015] Compared with the prior art, the technical solution provided in this application has the following advantages: The method provided in this application can determine the power generation data of the photovoltaic power generation equipment in a future time period based on the environmental data of the location of the photovoltaic power generation equipment; determine the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in the future time period; when the oil return time window arrives, determine the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the operating data of the air conditioning unit; when the unit oil return time arrives, control the air conditioning unit to perform the unit oil return operation according to the unit oil return parameters. This application predicts the power generation data based on the acquired environmental data and determines a more suitable oil return time window accordingly, and determines the unit oil return time and unit oil return parameters within the oil return time window based on the operating data of the air conditioning unit, thereby achieving the matching of unit oil return operation and photovoltaic power generation, avoiding the risk of oil return failure caused by insufficient photovoltaic power generation, and improving the utilization rate of photovoltaic energy and the stability of system operation, reducing unnecessary energy consumption, and realizing energy saving and energy efficiency improvement during system operation. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a flowchart of a return oil control method according to an embodiment of this application;

[0020] Figure 2 A detailed flowchart of a return oil control method according to an embodiment of this application;

[0021] Figure 3 This is a structural diagram of a return oil control device according to an embodiment of this application;

[0022] Figure 4 This is a structural diagram of a return oil control device according to an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0025] This application provides an oil return control method. This method can be applied to energy-saving air conditioning units. The energy-saving air conditioning unit can be a photovoltaic energy storage air conditioner. Types of energy-saving air conditioning units include, but are not limited to, photovoltaic multi-split units. The energy-saving air conditioning unit is connected to photovoltaic power generation equipment, which provides the electrical energy.

[0026] like Figure 1 The diagram shown is a flowchart of a return oil control method according to an embodiment of this application.

[0027] Step S110: Based on the environmental data of the location of the photovoltaic power generation equipment, determine the power generation data of the photovoltaic power generation equipment in the future time period.

[0028] Environmental data refers to environmental factors that affect the power generation capacity of photovoltaic (PV) power generation equipment. This environmental data includes, but is not limited to, the solar radiation intensity at the location of the PV power generation equipment, the season, and weather forecasts.

[0029] Power generation data refers to the power generation curve of photovoltaic power generation equipment. Power generation data can reflect the intermittent and fluctuating characteristics of photovoltaic power generation.

[0030] The duration of a future time period can be an empirical value or a value obtained through experimentation. The start time of the future time period is the current time. For example, a future time period is 24 hours from now.

[0031] Step S120: Based on the power generation data of the photovoltaic power generation equipment in the future time period, determine the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment.

[0032] The oil return time window refers to the time interval within which the maximum power generation occurs. The duration of this time interval can be an empirical value or a value obtained through experiments. This oil return time window represents the optimal oil return period in the power generation curve.

[0033] Step S130: When the oil return time window arrives, determine the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the operating data of the air conditioning unit.

[0034] The unit oil return time refers to the unit's oil return start time within the oil return time window.

[0035] The unit's oil return parameters refer to the parameters used when the air conditioning unit performs the oil return operation. These parameters include, but are not limited to: the compressor's operating power, the opening degree of the heating electronic expansion valve, and the duration of the oil return operation. The heating electronic expansion valve is used to control the refrigerant flow rate in the refrigerant piping.

[0036] Step S140: When the unit oil return time is reached, control the air conditioning unit to perform the unit oil return operation according to the unit oil return parameters.

[0037] The unit's oil return parameters include, but are not limited to: the compressor's operating power and the target opening degree of the heating electronic expansion valve.

[0038] Furthermore, after determining the unit's oil return parameters, the compressor's operating power in the unit's oil return parameters is converted into the compressor's operating frequency; the heating electronic expansion valve in the air conditioning unit is adjusted to the target opening degree in the unit's operating parameters; and the compressor in the air conditioning unit is adjusted to the converted operating frequency.

[0039] In this embodiment, the power generation data of the photovoltaic power generation equipment in the future time period can be determined based on the environmental data of the location of the photovoltaic power generation equipment. Based on the power generation data of the photovoltaic power generation equipment in the future time period, the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment is determined. When the oil return time window arrives, the unit's oil return time and parameters within the oil return time window are determined based on the operating data of the air conditioning unit. When the unit's oil return time arrives, the air conditioning unit is controlled to perform the unit oil return operation according to the unit's oil return parameters. This embodiment predicts power generation data based on the acquired environmental data and determines a suitable oil return time window accordingly. Furthermore, it determines the unit's oil return time and parameters within the oil return time window based on the operating data of the air conditioning unit. This achieves matching between the unit's oil return operation and the photovoltaic power generation, avoiding the risk of oil return failure due to insufficient photovoltaic power generation. Simultaneously, it improves the utilization rate of photovoltaic energy and the stability of system operation, reduces unnecessary energy consumption, and achieves energy saving and efficiency improvement during system operation.

[0040] To make the embodiments of this application easier to understand, the oil return control method of the embodiments of this application will be further described below.

[0041] In this embodiment of the application, the power generation data of the photovoltaic power generation equipment in a future time period can be determined based on the environmental data of the location of the photovoltaic power generation equipment.

[0042] Environmental data of the location of the photovoltaic power generation equipment can be acquired once every preset oil return control time period. Using a pre-trained power generation prediction model, the power generation data of the photovoltaic power generation equipment in the future time period can be determined.

[0043] The duration of the oil return control period can be an empirical value or a value obtained through experiments. For example, the duration of the oil return control period is 24 hours. During this period, at least one unit oil return operation must be performed. The time interval between two adjacent unit oil return operations is a preset oil return interval. In other words, it is the time interval between the end of one unit oil return operation and the start of the next. The oil return interval can be an empirical value or a value obtained through experiments. For example, the oil return interval can be 4 hours.

[0044] Environmental data includes, but is not limited to: the light intensity at the location of the photovoltaic power generation equipment, the season, and weather forecasts.

[0045] Power generation prediction models can be trained neural network models that can predict the power generation data of photovoltaic power generation equipment in the future based on input environmental data.

[0046] Furthermore, historical environmental data of the same period at the location of the photovoltaic power generation equipment can be obtained, or environmental data of the location of the photovoltaic power generation equipment at the time of the return oil control period can be obtained, or environmental data of the location of the photovoltaic power generation equipment at the previous return oil control period can be obtained.

[0047] In this embodiment of the application, after determining the power generation data of the photovoltaic power generation equipment in a future time period, the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment can be determined based on the power generation data of the photovoltaic power generation equipment in the future time period.

[0048] Furthermore, the number of oil return time windows is at least one. The duration of each oil return time window is greater than or equal to the duration of the unit's oil return operation.

[0049] In one implementation, the power generation data of the photovoltaic power generation equipment in a future time period can be input into a pre-trained oil return time prediction model; the oil return time prediction model can then determine the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in the future time period.

[0050] In another embodiment, when the power generation data is presented as a power generation curve, a sliding window can be pre-set. This sliding window moves along the power generation curve, and when the peak power generation is at the center of the sliding window, the sliding window is determined as the oil return time window. The duration of the sliding window is greater than or equal to the duration of the unit's oil return operation.

[0051] Furthermore, the unit operation data of the air conditioning unit includes the start time of the previous unit oil return operation. Based on the start time and duration of the previous unit oil return operation, the expected oil return time for the next unit oil return operation can be determined. The peak power generation is determined within a preset time range centered on the expected oil return time. When the peak power generation is at the center of the sliding window, the sliding window is determined as the oil return time window.

[0052] In this embodiment of the application, after determining the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment, the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window can be determined based on the operating data of the air conditioning unit when the oil return time window arrives.

[0053] Specifically, when the oil return time window arrives, the oil return operating power and the previous oil return time of the air conditioning unit can be determined based on the unit's operating data; the continuous operating time of the air conditioning unit after the previous oil return operation can be determined based on the previous oil return time; and the unit oil return time and parameters of the air conditioning unit within the oil return time window can be determined based on the oil return operating power, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window.

[0054] The unit's operating data includes, but is not limited to: the oil return operating power of the air conditioning unit and the previous oil return time of the air conditioning unit.

[0055] Oil return operating power refers to the standard operating power of the compressor when the air conditioning unit performs the oil return operation.

[0056] The previous oil return time refers to the start time of the previous oil return operation performed by the air conditioning unit.

[0057] Furthermore, based on the previous oil return time of the air conditioning unit and the preset oil return operation duration, the end time of the previous oil return operation of the air conditioning unit is determined; based on the end time of the previous oil return operation and the current time, the continuous operating time of the air conditioning unit after the previous oil return operation is determined. The continuous operating time of the air conditioning unit after the previous oil return operation is the time difference between the end time of the previous oil return operation and the current time.

[0058] In this embodiment of the application, determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window includes: when the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, and the continuous operating time of the air conditioning unit is greater than or equal to the preset oil return interval, determining the unit oil return time as the current time and determining the unit oil return parameters as preset standard oil return parameters.

[0059] The oil return interval refers to the standard time interval between two consecutive oil return operations performed by the unit. Furthermore, to avoid performing oil return operations when photovoltaic power is insufficient, the actual oil return interval can be less than or equal to the oil return time.

[0060] Standard oil return parameters include: the compressor's standard operating power and the target opening degree of the heating electronic expansion valve. The standard operating power refers to the oil return operating power of the aforementioned air conditioning unit.

[0061] If the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, it means that the photovoltaic power can support the air conditioning unit to perform the unit's oil return operation.

[0062] If the continuous operating time of the air conditioning unit is greater than or equal to the oil return interval, it means that the air conditioning unit needs to perform an oil return operation.

[0063] In this embodiment of the application, determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window includes: when the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, and the continuous operating duration of the air conditioning unit is less than a preset oil return interval duration and greater than or equal to a preset time tolerance, determining the unit oil return time as the maximum value time of the oil return time window and determining the unit oil return parameters as preheating oil return parameters; wherein, the operating power in the preheating oil return parameters is less than the oil return operating power.

[0064] Time tolerance refers to the allowable time for the air conditioning unit to perform the oil return operation ahead of schedule. The time tolerance can be a preset percentage of the oil return interval duration. For example, the time tolerance is 80% of the oil return interval duration.

[0065] The preheating return oil parameters refer to the first unit's return oil parameters corresponding to low-power return oil operation.

[0066] If the continuous operating time of the air conditioning unit is less than the oil return interval but greater than or equal to the preset time tolerance, it means that the air conditioning unit has not yet met the time conditions for oil return operation, but has met the time conditions that allow for early execution of the oil return operation. In this case, the oil return operation can be performed at the end of the oil return time window (i.e., the maximum end value time).

[0067] In this embodiment, determining the oil return time and parameters of the air conditioning unit within the oil return time window includes: if the maximum power generation within the oil return time window is less than the oil return operating power of the air conditioning unit, and the maximum power generation within the next adjacent time window is less than the oil return operating power of the air conditioning unit, determining the power generation change trend within the next adjacent time window; if the power generation change trend within the next adjacent time window is an upward trend, determining the oil return time as the time when the continuous operating duration of the air conditioning unit reaches the oil return interval duration, and determining the oil return parameters as preheating oil return parameters; if the power generation change trend within the next adjacent time window is not an upward trend, determining the oil return time as the current time, and determining the oil return parameters as cooling oil return parameters; wherein, the operating power in the preheating oil return parameters is less than the oil return operating power; and the operating power in the cooling oil return parameters is less than the oil return operating power.

[0068] The next adjacent time window after the return oil time window refers to the time window that is adjacent to the return oil time window and is later in time.

[0069] The preheating return oil parameters refer to the first unit's return oil parameters corresponding to low-power return oil operation.

[0070] Cooling oil return parameters refer to the second unit's oil return parameters corresponding to low-power oil return operation. In both the preheating and cooling oil return parameters, the opening degree of the heating electronic expansion valve can be a target opening degree. The operating power in both the preheating and cooling oil return parameters refers to the compressor's operating power. The compressor's operating power in the cooling oil return parameters can be less than or equal to the compressor's operating power in the preheating oil return parameters.

[0071] Furthermore, after determining the return oil time window, the time interval between the previous and subsequent return oil time windows can be defined as the next adjacent time window after the previous return oil time window. Alternatively, after determining the return oil time window, for each return oil time window, the position corresponding to the end time of the return oil time window on the power generation curve can be located. Based on the trend of the power generation curve after that position, the time interval corresponding to the single trend immediately following that position can be determined as the next adjacent time window. Here, a single trend refers to an upward or downward trend. For example, if a downward trend appears after that position, then the end position of the downward trend is determined as the end position of the next adjacent time window. Alternatively, after determining the return oil time window, for each return oil time window, based on the end time of the return oil time window, a time interval of a preset window length can be determined as the next adjacent time window.

[0072] If the power generation trend in the next adjacent time window is upward, it means that the photovoltaic power is insufficient to support normal unit oil return operation. However, if the photovoltaic power is on an upward trend, it is possible to try low-power unit oil return operation during the normal oil return time.

[0073] If the power generation trend in the next adjacent time window is not upward, it means that the photovoltaic power is insufficient to support the normal unit oil return operation, and the photovoltaic power may continue to decline. If the air conditioning unit returns oil at this time, it can avoid the problem of the photovoltaic power being even lower and causing the oil return failure. The low-power unit oil return operation can be executed immediately.

[0074] In this embodiment of the application, after determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window, the air conditioning unit can be controlled to perform the unit oil return operation according to the unit oil return parameters when the unit oil return time is reached.

[0075] In this embodiment of the application, before the oil return time of the unit, the compressor exhaust temperature of the air conditioning unit can also be detected; if the compressor exhaust temperature is greater than a preset exhaust temperature threshold, the subcooling solenoid valve in the air conditioning unit is opened; according to a preset gradient value, the opening degree of the subcooling electronic expansion valve in the air conditioning unit is increased until the compressor exhaust temperature is detected to be less than or equal to the exhaust temperature threshold.

[0076] The subcooling solenoid valve is used to open or close the bypass line from the subcooling section to the compressor.

[0077] The subcooled air electronic expansion valve is used to regulate the refrigerant flow rate in the bypass pipeline.

[0078] The following is a more specific example to describe the oil return control method of this application embodiment. Figure 2 This is a detailed flowchart of a return oil control method according to an embodiment of this application.

[0079] Step S210: When the oil return time window (i.e., within t1-t2) arrives, determine the continuous running time of the air conditioning unit after the previous oil return operation based on the unit's operating data.

[0080] Step S220: Determine whether the maximum power generation within the oil return time window is greater than or equal to the oil return operating power f1 of the air conditioning unit; if yes, proceed to step S230; if no, proceed to step S270.

[0081] Step S230: Determine whether the continuous running time is greater than or equal to the return oil interval duration T1; if yes, proceed to step S240; if no, proceed to step S250.

[0082] In step S240, if the maximum power generation within the oil return time window is greater than or equal to the oil return operating power f1 of the air conditioning unit, and the continuous operating length of the air conditioning unit is greater than or equal to the preset oil return interval duration T1, the oil return time of the unit is determined to be the current time and the oil return parameters of the unit are determined to be the preset standard oil return parameters.

[0083] Standard oil return parameters include: the compressor's standard operating power and the standard opening degree of the heating electronic expansion valve. The standard operating power is the aforementioned oil return operating power. The standard opening degree can be the aforementioned target opening degree.

[0084] By using standard oil return parameters to perform the unit's oil return operation, the air conditioning unit can perform high-power oil return normally and efficiently bring back the lubricating oil in the pipeline.

[0085] In step S250, if the maximum power generation within the oil return time window is greater than or equal to the oil return operating power f1 of the air conditioning unit, and the continuous operating time of the air conditioning unit is less than the preset oil return interval, determine whether the continuous operating time of the air conditioning unit is greater than the time tolerance T0; if yes, proceed to step S260; if no, it means that the air conditioning unit does not need oil return operation yet, and this process can be terminated first, and this process will be executed again when the next oil return time window arrives.

[0086] Step S260: If the continuous operating time of the air conditioning unit is greater than the time tolerance T0, determine the unit's oil return time as the maximum value time t2 of the oil return time window and determine the unit's oil return parameters as the preheating oil return parameters.

[0087] Wherein, the operating power in the preheating return oil parameters is less than the return oil operating power.

[0088] The preheating oil return parameters include: the compressor's first operating power f0 and the standard opening degree of the heating electronic expansion valve. The operating power (first operating power f0) in the preheating oil return parameters can be determined based on a preset first correction coefficient k1 and the maximum power generation P within the oil return time window. Where k1 is an empirical coefficient or a system determined experimentally, and k1 can be less than 1.

[0089] By using preheating oil return parameters to perform the unit's oil return operation, the compressor in the air conditioning unit can operate at a power lower than the oil return operating power. This reduces the starting shock of the air conditioning unit, reduces the power consumption of the air conditioning unit, and can also bring back a small amount of lubricating oil.

[0090] Step S270: If the maximum power generation within the oil return time window is less than the oil return operating power of the air conditioning unit, determine whether the power generation trend in the next adjacent time window is an upward trend; if yes, proceed to step S280; if no, proceed to step S290.

[0091] Step S280: If the power generation change trend in the next adjacent time window is determined to be an upward trend, the unit oil return time is determined to be the time when the continuous running time of the air conditioning unit is equal to the oil return interval, and the unit oil return parameter is determined to be the preheating oil return parameter.

[0092] Wherein, the operating power in the preheating return oil parameters is less than the return oil operating power.

[0093] The oil return time of the unit is determined as the time when the continuous running time of the air conditioning unit reaches the oil return interval, that is, to make the air conditioning unit return oil according to the normal oil return interval.

[0094] Step S290: If the power generation change trend in the next adjacent time window is not an upward trend, determine the unit oil return time as the current time and determine the unit oil return parameter as the cooling oil return parameter.

[0095] Wherein, the operating power in the preheating oil return parameters can be less than the oil return operating power; the operating power in the cooling oil return parameters can be less than or equal to the operating power in the preheating oil return parameters.

[0096] The cooling oil return parameters include: the compressor's second operating power f2 and the standard opening degree of the heating electronic expansion valve. The operating power (second operating power f2) in the preheating oil return parameters can be determined based on the preset second correction coefficient k2 and the maximum power generation P within the oil return time window. Where k2 is an empirical coefficient or a system determined experimentally, k2 can be less than or equal to k1.

[0097] This application addresses the technical problem of unreasonable oil return timing in photovoltaic power generation systems due to differences in sunlight, season, and region. This leads to air conditioning units failing to perform oil return operations or experiencing low energy utilization when photovoltaic power is insufficient. This application can predict power generation data for future periods and select periods with sufficient sunlight and high power generation for oil return operations. Furthermore, it dynamically determines the optimal oil return time window based on sunlight intensity, seasonal characteristics, and regional differences, matching the oil return operation with peak photovoltaic power generation. This significantly increases the reliance on photovoltaic power for the oil return process, improving energy utilization and system stability. Moreover, based on the air conditioning unit's oil return operating power, the unit's continuous operating time since the last oil return operation, and the maximum power generation within the oil return time window, a suitable operating power is determined. Examples include low preheating power, high main oil return power, and low cooling power. These three operating powers are matched to the rising, peak, and falling periods of photovoltaic power generation, respectively, achieving efficient utilization of photovoltaic energy and improving system operating efficiency.

[0098] This application also provides a return oil control device. For example... Figure 3 The diagram shown is a structural diagram of a return oil control device according to an embodiment of this application.

[0099] The oil return control device includes:

[0100] The first determining module 310 is used to determine the power generation data of the photovoltaic power generation equipment in a future time period based on the environmental data of the location of the photovoltaic power generation equipment.

[0101] The second determining module 320 is used to determine the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in a future time period; wherein, the oil return time window refers to the time interval in which the maximum power generation occurs.

[0102] The third determining module 330 is used to determine the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the operating data of the air conditioning unit when the oil return time window arrives.

[0103] The oil return control module 340 is used to control the air conditioning unit to perform the unit oil return operation according to the unit oil return parameters when the unit oil return time is reached.

[0104] The functions of the apparatus described in this application embodiment have been described in the above method embodiments. Therefore, for any parts not detailed in the description of this embodiment, please refer to the relevant descriptions in the foregoing embodiments, which will not be repeated here.

[0105] This application also provides a return oil control device, such as... Figure 4 The diagram shown is a structural diagram of a return oil control device according to an embodiment of this application.

[0106] The oil return control device includes a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440.

[0107] Memory 430 is used to store computer programs.

[0108] In one embodiment of this application, when the processor 410 executes the program stored in the memory 430, it implements the oil return control method provided in any of the foregoing method embodiments, including: determining the power generation data of the photovoltaic power generation equipment in a future time period based on the environmental data of the location of the photovoltaic power generation equipment; determining the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation equipment based on the power generation data of the photovoltaic power generation equipment in the future time period; wherein, the oil return time window refers to the time interval where the maximum power generation is located; when the oil return time window arrives, determining the unit oil return time and unit oil return parameters of the air conditioning unit in the oil return time window based on the operating data of the air conditioning unit; when the unit oil return time arrives, controlling the air conditioning unit to perform the unit oil return operation according to the unit oil return parameters.

[0109] Specifically, when the oil return time window arrives, determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the unit's operating data includes: when the oil return time window arrives, determining the oil return operating power and the previous oil return time of the air conditioning unit based on the unit's operating data; determining the continuous operating duration of the air conditioning unit after the previous oil return operation based on the previous oil return time; and determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the oil return operating power, the continuous operating duration of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window.

[0110] Specifically, determining the oil return time and parameters of the air conditioning unit within the oil return time window based on the oil return operating power of the air conditioning unit, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window includes: if the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, and the continuous operating time of the air conditioning unit is greater than or equal to a preset oil return interval, then determining the oil return time as the current time and determining the oil return parameters as preset standard oil return parameters.

[0111] The step of determining the unit oil return time and unit oil return parameters within the oil return time window based on the oil return operating power of the air conditioning unit, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window includes: if the maximum power generation within the oil return time window is greater than or equal to the oil return operating power of the air conditioning unit, and the continuous operating time of the air conditioning unit is less than a preset oil return interval and greater than or equal to a preset time tolerance, then the unit oil return time is determined to be the maximum value time of the oil return time window, and the unit oil return parameters are determined to be preheating oil return parameters; wherein the operating power in the preheating oil return parameters is less than the oil return operating power.

[0112] The step of determining the unit oil return time and unit oil return parameters of the air conditioning unit within the oil return time window based on the oil return operating power of the air conditioning unit, the continuous operating time of the air conditioning unit after the previous oil return operation, and the maximum power generation within the oil return time window includes: determining the power generation change trend within the next adjacent time window when the maximum power generation within the oil return time window is less than the oil return operating power of the air conditioning unit; and when the maximum power generation within the next adjacent time window is less than the oil return operating power of the air conditioning unit. If the power generation trend in the next adjacent time window is upward, the unit oil return time is determined to be the time when the continuous operating time of the air conditioning unit reaches the oil return interval, and the unit oil return parameter is determined to be the preheating oil return parameter; if the power generation trend in the next adjacent time window is not upward, the unit oil return time is determined to be the current time, and the unit oil return parameter is determined to be the cooling oil return parameter; wherein, the operating power in the preheating oil return parameter is less than the oil return operating power; and, the operating power in the cooling oil return parameter is less than the oil return operating power.

[0113] Before the oil return time of the unit, the process includes: detecting the compressor discharge temperature of the air conditioning unit; opening the subcooling solenoid valve in the air conditioning unit when the compressor discharge temperature is greater than a preset discharge temperature threshold; and increasing the opening of the subcooling electronic expansion valve in the air conditioning unit according to a preset gradient value until the compressor discharge temperature is detected to be less than or equal to the discharge temperature threshold.

[0114] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the return oil control method provided in any of the foregoing method embodiments. Since the return oil control method has already been described in detail above, any omissions or deficiencies in the description of this embodiment can be found in the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0115] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0116] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0117] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0118] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An oil return control method characterized by, The method comprises the following steps: According to the acquired environmental data of the location where the photovoltaic power generation device is located, the power generation power data of the photovoltaic power generation device in the future time period is determined; According to the power generation power data of the photovoltaic power generation device in the future time period, the oil return time window corresponding to the air conditioning unit powered by the photovoltaic power generation device is determined; wherein the oil return time window refers to the time interval where the maximum power generation power is located; When the oil return time window arrives, the unit oil return time and the unit oil return parameter of the air conditioning unit in the oil return time window are determined according to the operation data of the air conditioning unit, comprising: when the oil return time window arrives, the oil return operation power of the air conditioning unit and the previous oil return time of the air conditioning unit are determined according to the unit operation data of the air conditioning unit; the continuous running time length of the air conditioning unit after the previous unit oil return operation is executed is determined according to the previous oil return time of the air conditioning unit; the unit oil return time and the unit oil return parameter of the air conditioning unit in the oil return time window are determined according to the oil return operation power of the air conditioning unit, the continuous running time length of the air conditioning unit after the previous unit oil return operation is executed and the maximum power generation power in the oil return time window; When the unit oil return time arrives, the air conditioning unit is controlled to execute the unit oil return operation according to the unit oil return parameter.

2. The method of claim 1, wherein, The determination of the unit oil return time and the unit oil return parameter of the air conditioning unit in the oil return time window according to the oil return operation power of the air conditioning unit, the continuous running time length of the air conditioning unit after the previous unit oil return operation is executed and the maximum power generation power in the oil return time window comprises: In the case that the maximum power generation power in the oil return time window is greater than or equal to the oil return operation power of the air conditioning unit, and the continuous running time length of the air conditioning unit is greater than or equal to the preset oil return interval time length, the unit oil return time is determined as the current time and the unit oil return parameter is determined as the preset standard oil return parameter.

3. The method of claim 1, wherein, The determination of the unit oil return time and the unit oil return parameter of the air conditioning unit in the oil return time window according to the oil return operation power of the air conditioning unit, the continuous running time length of the air conditioning unit after the previous unit oil return operation is executed and the maximum power generation power in the oil return time window comprises: In the case that the maximum power generation power in the oil return time window is greater than or equal to the oil return operation power of the air conditioning unit, and the continuous running time length of the air conditioning unit is less than the preset oil return interval time length and greater than or equal to the preset time allowance, the unit oil return time is determined as the maximum end value time of the oil return time window and the unit oil return parameter is determined as the preheating oil return parameter; Wherein, the operation power in the preheating oil return parameter is less than the oil return operation power.

4. The method of claim 1, wherein, The determination of the unit oil return time and the unit oil return parameter of the air conditioning unit in the oil return time window according to the oil return operation power of the air conditioning unit, the continuous running time length of the air conditioning unit after the previous unit oil return operation is executed and the maximum power generation power in the oil return time window comprises: determining a power generation trend in a next adjacent time window of the oil return time window; in a case that the power generation trend in the next adjacent time window is an upward trend, determining the unit oil return time as a time when the continuous operation duration of the air conditioning unit reaches an oil return interval duration and determining the unit oil return parameter as a preheating oil return parameter; in a case that the power generation trend in the next adjacent time window is not an upward trend, determining the unit oil return time as a current time and determining the unit oil return parameter as a cooling oil return parameter; wherein an operation power in the preheating oil return parameter is less than the oil return operation power; and an operation power in the cooling oil return parameter is less than the oil return operation power.

5. The method of claim 1, wherein, before the unit oil return time arrives, further comprising: detecting a compressor discharge temperature of the air conditioning unit; in a case that the compressor discharge temperature is greater than a preset discharge temperature threshold, opening a supercooling electromagnetic valve in the air conditioning unit; increasing an opening degree of a supercooling electronic expansion valve in the air conditioning unit according to a preset gradient value until the compressor discharge temperature is detected to be less than or equal to the discharge temperature threshold.

6. An oil return control device characterized by comprising: comprising: a first determining module configured to determine power generation data of a photovoltaic power generation device in a future time period according to acquired environmental data of a location where the photovoltaic power generation device is located; a second determining module configured to determine an oil return time window corresponding to an air conditioning unit powered by the photovoltaic power generation device according to the power generation data of the photovoltaic power generation device in the future time period; wherein the oil return time window refers to a time interval where a maximum power generation is located; a third determining module configured to determine a unit oil return time and a unit oil return parameter of the air conditioning unit in the oil return time window according to operation data of the air conditioning unit when the oil return time window arrives, comprising: determining an oil return operation power of the air conditioning unit and a previous oil return time of the air conditioning unit according to unit operation data of the air conditioning unit when the oil return time window arrives; determining a continuous operation duration of the air conditioning unit after a previous unit oil return operation is performed according to the previous oil return time of the air conditioning unit; determining the unit oil return time and the unit oil return parameter of the air conditioning unit in the oil return time window according to the oil return operation power of the air conditioning unit, the continuous operation duration of the air conditioning unit after the previous unit oil return operation is performed, and a maximum power generation in the oil return time window; an oil return control module configured to control the air conditioning unit to perform a unit oil return operation according to the unit oil return parameter when the unit oil return time arrives.

7. An energy saving air conditioning unit characterized by, The energy-saving air conditioning unit applies the oil return control method in any one of claims 1-5.

8. An oil return control apparatus characterized by comprising: comprising: at least one communication interface; at least one bus connected with the at least one communication interface; at least one processor connected with the at least one bus; at least one memory connected with the at least one bus, wherein the processor is configured to execute an oil return control program stored in the memory to implement the oil return control method of any one of claims 1-5.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions which are executed to implement the oil return control method of any one of claims 1-5.

Images