Photovoltaic air conditioner self-cleaning control method and control device

Abstract

This invention discloses a self-cleaning control method and device for photovoltaic air conditioners to improve their self-cleaning performance. The method includes: acquiring real-time target power of the air conditioner and real-time photovoltaic output power during the defrosting process of the outdoor unit or the frosting process of the indoor unit self-cleaning of the photovoltaic air conditioner; when the real-time target power of the air conditioner is greater than the real-time photovoltaic output power, performing a photovoltaic multi-power peak scan to obtain the maximum photovoltaic power, and controlling the self-cleaning operation of the photovoltaic air conditioner based on the maximum power; when the real-time target power of the air conditioner is not greater than the real-time photovoltaic output power, controlling the self-cleaning operation of the photovoltaic air conditioner based on the real-time target power; and performing a photovoltaic multi-power peak scan during the frosting process of the outdoor unit or the defrosting process of the indoor unit self-cleaning of the photovoltaic air conditioner to obtain the maximum photovoltaic power, and controlling the self-cleaning operation of the photovoltaic air conditioner based on the maximum power.

Description

Technical Field

[0001] This invention belongs to the field of energy-saving air conditioning technology, specifically, it relates to a self-cleaning control method and control device for photovoltaic air conditioners. Background Technology

[0002] Photovoltaic air conditioners utilize the photovoltaic array within photovoltaic modules to convert solar energy into electrical energy, providing the power required for their operation. As an energy-saving type of air conditioner, it has been widely applied in various fields such as production and daily life due to the increasing urgency of energy conservation and emission reduction needs and the continuous maturation of photovoltaic technology. Existing photovoltaic air conditioners have a self-cleaning function, using the heat exchanger as an evaporator to generate condensate water, which carries away dust and dirt from the surface of the heat exchanger, achieving automatic cleaning of the air conditioner's heat exchanger.

[0003] Because the performance of photovoltaic (PV) arrays is significantly affected by the environment, if the array is shaded, not only will its maximum power decrease, but multiple peak power points will also occur. When a PV array has multiple peak power points, the maximum power point tracking (MPPT) process becomes complex and inaccurate, preventing the array from quickly, effectively, and stably outputting maximum power, thus affecting the stability of the air conditioner's operating power. Unstable air conditioner operating power, in turn, affects the frosting and defrosting processes of the heat exchanger during self-cleaning operation, easily leading to problems such as insufficient frosting affecting self-cleaning efficiency and incomplete defrosting affecting the heat exchanger's heat exchange performance. Summary of the Invention

[0004] The purpose of this invention is to provide a self-cleaning control method and control device for photovoltaic air conditioners, so as to improve the self-cleaning performance of photovoltaic air conditioners.

[0005] To achieve the above-mentioned objectives, the self-cleaning control method provided by this invention employs the following technical solution:

[0006] A self-cleaning control method for photovoltaic air conditioners, comprising:

[0007] When the photovoltaic air conditioner performs the defrosting process of outdoor unit self-cleaning or the frosting process of indoor unit self-cleaning, the following first control process is executed:

[0008] Obtain the real-time target power of the photovoltaic air conditioner and the real-time photovoltaic output power of the photovoltaic array;

[0009] When the real-time air conditioning target power is greater than the real-time photovoltaic output power, a photovoltaic multi-power peak scan is performed to obtain the maximum power of the photovoltaic maximum power point, and the self-cleaning operation of the photovoltaic air conditioner is controlled according to the maximum power; when the real-time air conditioning target power is not greater than the real-time photovoltaic output power, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the real-time air conditioning target power.

[0010] When the photovoltaic air conditioner performs the outdoor unit self-cleaning frosting process or the indoor unit self-cleaning defrosting process, the following second control process is executed:

[0011] A photovoltaic multi-power peak scan is performed to obtain the maximum power of the photovoltaic maximum power point, and the self-cleaning operation of the photovoltaic air conditioner is controlled based on the maximum power.

[0012] In some embodiments of this application, during the first control process, controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power specifically includes:

[0013] Obtain the power difference between the real-time target power of the air conditioner and the real-time output power of the photovoltaic system;

[0014] The defrosting time of the outdoor unit or the frosting time of the indoor unit is adjusted according to the power difference, and the defrosting time or frosting time is positively correlated with the power difference.

[0015] In some embodiments of this application, adjusting the defrosting time of the outdoor unit's self-cleaning or the frosting time of the indoor unit's self-cleaning based on the power difference specifically includes:

[0016] The adjustment value of the defrosting time for the outdoor unit's self-cleaning is determined based on the power difference. The sum of the set defrosting time for the outdoor unit's self-cleaning and the adjustment value of the defrosting time is determined as the actual defrosting time for the outdoor unit's self-cleaning. The adjustment value of the defrosting time is a positive number and is positively correlated with the power difference.

[0017] Alternatively, the adjustment value of the frosting time for the indoor unit's self-cleaning can be determined based on the power difference, and the sum of the set frosting time for the indoor unit's self-cleaning and the adjustment value of the frosting time can be determined as the actual frosting time for the indoor unit's self-cleaning; the adjustment value of the frosting time is a positive number and is positively correlated with the power difference.

[0018] In some embodiments of this application, during the first control process, controlling the self-cleaning operation of the photovoltaic air conditioner according to the real-time air conditioner target power specifically includes:

[0019] The defrosting time for the outdoor unit's self-cleaning function is set to a defrosting time, or the frosting time for the indoor unit's self-cleaning function is set to a frosting time.

[0020] In some embodiments of this application, during the second control process, controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power specifically includes:

[0021] Compare the maximum power with a set power threshold.

[0022] When the maximum power is greater than the set power threshold, the defrosting time of the outdoor unit self-cleaning or the defrosting time of the indoor unit self-cleaning is adjusted according to the first power difference obtained by subtracting the maximum power from the set power threshold, and the defrosting time or defrosting time is negatively correlated with the first power difference.

[0023] When the maximum power is not greater than the set power threshold, the defrosting time of the outdoor unit self-cleaning or the defrosting time of the indoor unit self-cleaning is adjusted according to the second power difference obtained by subtracting the set power threshold from the maximum power, and the defrosting time or defrosting time is positively correlated with the second power difference.

[0024] In some embodiments of this application, adjusting the frosting time of the outdoor unit's self-cleaning or the defrosting time of the indoor unit's self-cleaning based on the first power difference specifically includes:

[0025] The first adjustment value for the frosting time of the outdoor unit self-cleaning is determined based on the first power difference. The difference between the set frosting time of the outdoor unit self-cleaning and the first adjustment value for the frosting time is determined as the actual frosting time of the outdoor unit self-cleaning. The first adjustment value for the frosting time is a positive number and is positively correlated with the first power difference.

[0026] Alternatively, a first adjustment value for the defrosting time of the indoor unit's self-cleaning can be determined based on the first power difference, and the difference between the set defrosting time of the indoor unit's self-cleaning and the first adjustment value for the defrosting time can be determined as the actual defrosting time of the indoor unit's self-cleaning; the first adjustment value for the defrosting time is a positive number and is positively correlated with the first power difference;

[0027] Adjust the defrosting time of the outdoor unit's self-cleaning function or the defrosting time of the indoor unit's self-cleaning function based on the second power difference, specifically including:

[0028] The second adjustment value for the frosting time of the outdoor unit self-cleaning is determined based on the second power difference. The sum of the set frosting time of the outdoor unit self-cleaning and the second adjustment value of the frosting time is determined as the actual frosting time of the outdoor unit self-cleaning. The second adjustment value of the frosting time is a positive number and is positively correlated with the second power difference.

[0029] Alternatively, a second adjustment value for the defrosting time of the indoor unit's self-cleaning can be determined based on the second power difference, and the sum of the set defrosting time of the indoor unit's self-cleaning and the second adjustment value of the defrosting time can be determined as the actual defrosting time of the indoor unit's self-cleaning; the second adjustment value of the defrosting time is a positive number and is positively correlated with the second power difference.

[0030] In some embodiments of this application, performing the photovoltaic multi-power peak scanning to obtain the maximum power of the photovoltaic maximum power point specifically includes:

[0031] On the photovoltaic power-voltage curve, the operating point with the open-circuit voltage is taken as the initial search point. The search proceeds in the direction of decreasing voltage until the first peak power point is found. The first voltage and the first power corresponding to the first peak power point are recorded.

[0032] The difference voltage is determined based on the first voltage; the difference voltage is less than the first voltage.

[0033] The operating point where the voltage equals the voltage difference is used as the new search starting point to continue the search. The peak power point found in the subsequent search is recorded as the most recent peak power point, and the voltage and power corresponding to the most recent peak power point are recorded.

[0034] The sum of the voltage corresponding to the most recent peak power point and the difference voltage is used as the voltage of the next search starting point;

[0035] Determine whether the difference between the first voltage and the voltage of the next search starting point is less than the difference voltage; if not, take the operating point with a voltage equal to the voltage of the next search starting point as the new search starting point and continue searching; until the difference between the first voltage and the voltage of the next search starting point is less than the difference voltage, then stop searching;

[0036] After the search stops, the point with the highest power among all the peak power points found is determined as the photovoltaic maximum power point, and the power of the photovoltaic maximum power point is determined as the maximum power.

[0037] In some embodiments of this application, determining the difference voltage based on the first voltage specifically includes:

[0038] The number N of the photovoltaic array connected in series is obtained, and the difference voltage is determined based on the first voltage and the number N. The difference voltage is positively correlated with the first voltage and negatively correlated with the number N.

[0039] To achieve the aforementioned objectives, the self-cleaning control device provided by this invention employs the following technical solution:

[0040] A self-cleaning control device for photovoltaic air conditioners, comprising:

[0041] The self-cleaning operation phase determination unit is used to determine the current self-cleaning operation phase of the air conditioner.

[0042] A real-time air conditioning target power acquisition unit is used to acquire the real-time air conditioning target power of the photovoltaic air conditioner.

[0043] A real-time photovoltaic output power acquisition unit is used to acquire the real-time photovoltaic output power of the photovoltaic array in a photovoltaic air conditioner.

[0044] The execution unit is used to execute a first control process when the photovoltaic air conditioner performs the defrosting process of the outdoor unit self-cleaning or the frosting process of the indoor unit self-cleaning; it is also used to execute a second control process when the photovoltaic air conditioner performs the frosting process of the outdoor unit self-cleaning or the defrosting process of the indoor unit self-cleaning.

[0045] The first control process includes: when the real-time air conditioner target power is greater than the real-time photovoltaic output power, performing photovoltaic multi-power peak scanning to obtain the maximum power of the photovoltaic maximum power point, and controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power; when the real-time air conditioner target power is not greater than the real-time photovoltaic output power, controlling the self-cleaning operation of the photovoltaic air conditioner according to the real-time air conditioner target power.

[0046] The second control process includes: performing a photovoltaic multi-power peak scan to obtain the maximum power of the photovoltaic maximum power point, and controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power.

[0047] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the above-described photovoltaic air conditioner self-cleaning control method is implemented.

[0048] Compared with the prior art, the advantages and positive effects of the present invention are:

[0049] The photovoltaic air conditioner self-cleaning control method and device provided by this invention, when the photovoltaic air conditioner performs the defrosting process of the outdoor unit self-cleaning or the frosting process of the indoor unit self-cleaning, the power required for the operation of the photovoltaic air conditioner is relatively small. Under this condition, the real-time target power required by the photovoltaic air conditioner and the real-time photovoltaic output power that the photovoltaic array can provide are used as judgment parameters. When the real-time target power of the air conditioner is greater than the real-time photovoltaic output power, the photovoltaic output cannot meet the actual needs of the air conditioner. At this time, a photovoltaic multi-power peak scan will be performed to obtain the maximum power of the maximum power point, and the self-cleaning operation of the photovoltaic air conditioner will be controlled according to the maximum power to meet the self-cleaning operation requirements of the air conditioner as much as possible and improve the self-cleaning effect. When the real-time target power of the air conditioner is not greater than the real-time photovoltaic output power, the photovoltaic output will not operate at maximum power. The power level at which the self-cleaning function is achieved generally meets the actual needs of the air conditioner. In this case, photovoltaic multi-power peak scanning is not performed; instead, the self-cleaning operation of the photovoltaic air conditioner is directly controlled based on the real-time target power of the air conditioner. This avoids the complexity of multi-power peak scanning and the instability caused by inaccurate scanning, which could affect the self-cleaning effect. However, during the frosting process of the outdoor unit or the defrosting process of the indoor unit, the photovoltaic air conditioner requires a larger power. In this condition, the relationship between the real-time target power required by the air conditioner and the real-time photovoltaic output power provided by the photovoltaic array is not considered. Instead, photovoltaic multi-power peak scanning is performed to obtain the maximum power at the maximum power point. The self-cleaning operation of the photovoltaic air conditioner is then controlled based on the maximum power to meet the self-cleaning requirements as much as possible and improve the self-cleaning effect. Using the control method and device provided by this invention, photovoltaic multi-power peak scanning can be selectively performed based on different stages of photovoltaic air conditioner self-cleaning, simplifying the control process and maintaining the stability of the photovoltaic air conditioning system while ensuring the self-cleaning effect.

[0050] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a flowchart of one embodiment of the photovoltaic air conditioner self-cleaning control method of the present invention;

[0053] Figure 2 This is a schematic diagram of one embodiment of the photovoltaic air conditioner self-cleaning control device of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0055] It should be noted that the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0056] Figure 1 A flowchart of one embodiment of the photovoltaic air conditioner self-cleaning control method of the present invention is shown.

[0057] like Figure 1 As shown, this embodiment employs the following process for self-cleaning control.

[0058] S101: Obtain the self-cleaning operation phase of the photovoltaic air conditioner.

[0059] The self-cleaning operation phase of a photovoltaic air conditioner includes four stages: the frosting process of the outdoor unit self-cleaning, the frosting process of the indoor unit self-cleaning, and the defrosting process of the outdoor unit self-cleaning.

[0060] S102: Determine whether the first control process condition is met. If yes, proceed to step S103; otherwise, proceed to step S108.

[0061] In this embodiment, the first control process condition is that the photovoltaic air conditioner performs either the defrosting process of the outdoor unit or the frosting process of the indoor unit for self-cleaning. When the self-cleaning operation stage of the photovoltaic air conditioner obtained in step S101 is either the defrosting process of the outdoor unit or the frosting process of the indoor unit for self-cleaning, it is determined that the first control process condition is met. Then, the control process of step S103 or step S104 is executed according to the result of determining whether the first control process condition is met.

[0062] S103: Execute the first control process.

[0063] When a photovoltaic air conditioner performs the defrosting process for its outdoor unit self-cleaning, the air conditioner operates in cooling mode. The outdoor unit heat exchanger, acting as a condenser, releases heat to melt the frost on the heat exchanger and uses the melted water to clean it.

[0064] When the photovoltaic air conditioner performs the self-cleaning frosting process of the indoor unit, it also operates in cooling mode. The indoor unit heat exchanger absorbs heat as an evaporator, and the indoor air frosts on the surface of the indoor unit heat exchanger.

[0065] When the photovoltaic air conditioner is in the defrosting process of outdoor unit self-cleaning or the frosting process of indoor unit self-cleaning, it operates in cooling mode, where the required power is relatively low. Under these conditions, the first control process will be executed, specifically steps S104 to S107.

[0066] S104: Obtain the real-time target power P1 of the photovoltaic air conditioner and the real-time photovoltaic output power P2 of the photovoltaic array.

[0067] In the first control process, the real-time target power P1 of the photovoltaic air conditioner and the real-time photovoltaic output power P2 of the photovoltaic array are first acquired. The real-time target power of the air conditioner is the operating power required by the photovoltaic air conditioner, which is acquired in real time according to the set sampling frequency and is the power required to perform the self-cleaning process; while the real-time photovoltaic output power of the photovoltaic array is the output power that the photovoltaic array in the photovoltaic air conditioner can provide, which is acquired in real time according to the set sampling frequency. The methods for acquiring both powers are implemented using existing technologies, and will not be specifically described or limited here.

[0068] S105: Determine whether P1 > P2. If yes, proceed to step S106; otherwise, proceed to step S107.

[0069] S106: Perform photovoltaic multi-power peak scanning to obtain the maximum power of the photovoltaic maximum power point, and control self-cleaning operation based on the maximum power.

[0070] When S105 determines that P1 > P2, meaning the real-time target power of the air conditioner is greater than the real-time photovoltaic output power, the photovoltaic output cannot meet the actual power requirements of the air conditioner during self-cleaning. Therefore, a multi-power peak scan of the photovoltaic system is performed to obtain the maximum power corresponding to the photovoltaic maximum power point. The self-cleaning operation is controlled based on this maximum power to meet the self-cleaning operation requirements of the air conditioner as much as possible and improve the self-cleaning effect.

[0071] S107: Self-cleaning operation is controlled based on the real-time target power of the air conditioner.

[0072] When S105 determines that P1 > P2 is not satisfied, meaning the real-time air conditioner target power is not greater than the real-time photovoltaic output power, the photovoltaic output power can meet the actual power requirements for the air conditioner's self-cleaning. Even if the photovoltaic output is not operating at its maximum power point, it can still basically meet the actual self-cleaning needs of the air conditioner. In this case, photovoltaic multi-power peak scanning is not performed; the self-cleaning operation of the photovoltaic air conditioner is directly controlled based on the real-time air conditioner target power to achieve the self-cleaning effect. By not performing multi-power peak scanning, the complexity of multi-power peak scanning and the problem of unstable air conditioner operation due to inaccurate scanning, which affects the self-cleaning effect, are effectively avoided.

[0073] S108: Execute the second control process.

[0074] If step S102 determines that the self-cleaning stage does not meet the conditions of the first control process, then the self-cleaning operation stage of the photovoltaic air conditioner is either the frosting process of the outdoor unit's self-cleaning or the defrosting process of the indoor unit's self-cleaning.

[0075] When a photovoltaic air conditioner performs the outdoor unit self-cleaning frosting process, the photovoltaic air conditioner is running in heating mode. The outdoor unit heat exchanger acts as an evaporator to absorb heat, and outdoor air frosts on the surface of the outdoor unit heat exchanger.

[0076] When a photovoltaic air conditioner performs the defrosting process of self-cleaning the indoor unit, the photovoltaic air conditioner is in heating mode. The indoor unit heat exchanger, acting as a condenser, releases heat to melt the frost on the indoor unit heat exchanger, and uses the melted water to clean the indoor unit heat exchanger.

[0077] When the photovoltaic air conditioner is in either the outdoor unit's self-cleaning frosting process or the indoor unit's self-cleaning defrosting process, it operates in heating mode, requiring a higher power output. Under these conditions, the second control process will be executed, specifically step S109.

[0078] S109: Perform photovoltaic multi-power peak scanning to obtain the maximum power of the photovoltaic maximum power point, and control self-cleaning operation based on the maximum power.

[0079] When the photovoltaic air conditioner performs the outdoor unit self-cleaning frosting process or the indoor unit self-cleaning defrosting process, the photovoltaic air conditioner requires a large power. Under this condition, the relationship between the real-time target power required by the air conditioner and the real-time photovoltaic output power that the photovoltaic array can provide is not considered. Instead, a photovoltaic multi-power peak scan is performed to obtain the maximum power of the maximum power point. The self-cleaning operation of the photovoltaic air conditioner is controlled according to the maximum power to meet the self-cleaning operation requirements of the air conditioner as much as possible and improve the self-cleaning effect.

[0080] The method described in the above embodiments for photovoltaic air conditioner self-cleaning control can selectively perform photovoltaic multi-power peak scanning based on different stages of photovoltaic air conditioner self-cleaning, simplifying the control process and maintaining the stability of photovoltaic air conditioner system operation while ensuring the self-cleaning effect of photovoltaic air conditioner.

[0081] In the self-cleaning operation control of photovoltaic air conditioners, the compressor defrosting frequency or compressor frost formation frequency is usually determined based on factors such as ambient temperature, humidity, and cleanliness requirements. Then, the frost formation process is completed by controlling the frost formation time, and the defrosting process is completed by controlling the defrosting time. Therefore, frost formation time and defrosting time are key control parameters reflecting the degree of frost formation and defrosting, and consequently, the self-cleaning effect.

[0082] Based on the above description, using frosting time and / or defrosting time as control parameters for the self-cleaning process is beneficial for simply and effectively controlling the self-cleaning effect.

[0083] In some embodiments, during the first control process, controlling the self-cleaning operation of the photovoltaic air conditioner based on the maximum power specifically includes:

[0084] First, obtain the power difference between the real-time target power of the air conditioner and the real-time output power of the photovoltaic system.

[0085] Then, adjust the defrosting time of the outdoor unit's self-cleaning function or the frosting time of the indoor unit's self-cleaning function according to the power difference, and the defrosting time or frosting time is positively correlated with the power difference.

[0086] During the maximum power scan in the first control process, if the real-time target power of the air conditioner is greater than the real-time photovoltaic output power, the power difference between the two will be positive. The larger the power difference, the greater the insufficiency of the real-time photovoltaic output power in meeting the actual needs of the air conditioner, and the more insufficient the photovoltaic output power. Therefore, when determining the defrosting or frosting time based on the power difference, a positive correlation is used: the larger the power difference, the longer the determined defrosting or frosting time. This extended running time addresses issues such as insufficient frosting due to insufficient photovoltaic output power or compressor frequency reduction, which affects the self-cleaning effect, or incomplete defrosting affecting the heat exchanger's heat exchange performance.

[0087] In some other embodiments, the adjustment of defrosting time or frosting time is not arbitrary, but based on the preset frosting time and defrosting time of the photovoltaic air conditioner under the rated state with sufficient power, so as to match the performance of the photovoltaic air conditioner itself.

[0088] In these embodiments, adjusting the defrosting time of the outdoor unit's self-cleaning or the frosting time of the indoor unit's self-cleaning based on the power difference specifically includes:

[0089] The defrosting time adjustment value for the outdoor unit's self-cleaning is determined based on the power difference. The sum of the set defrosting time and the adjusted defrosting time value is determined as the actual defrosting time for the outdoor unit's self-cleaning. The adjusted defrosting time value is a positive number and is positively correlated with the frequency difference. The actual defrosting time obtained in this way is also positively correlated with the power difference.

[0090] Alternatively, the adjustment value for the frosting time of the indoor unit's self-cleaning function can be determined based on the power difference. The sum of the set frosting time and the adjusted value is then used to determine the actual frosting time for the indoor unit's self-cleaning function. The adjusted value for the frosting time is a positive number and is positively correlated with the power difference. The actual frosting time obtained in this way is also positively correlated with the power difference.

[0091] In other embodiments, during the first control process, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the real-time target power of the air conditioner, specifically including:

[0092] The defrosting time for the outdoor unit's self-cleaning function is set to the defrosting time, or the frosting time for the indoor unit's self-cleaning function is set to the frosting time.

[0093] During the first control process, when the real-time air conditioning target power is not greater than the real-time photovoltaic output power, the photovoltaic output power is sufficient. The defrosting time and the frosting time are controlled to be the set defrosting time and the frosting time, which are adapted to the performance of the photovoltaic air conditioner itself.

[0094] In some other embodiments, during the second control process, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the maximum power, specifically including:

[0095] First, the maximum power is compared with a set power threshold. The set power threshold is a known power value, typically a larger one.

[0096] When the maximum power is greater than the set power threshold, the defrosting time of the outdoor unit self-cleaning or the defrosting time of the indoor unit self-cleaning is adjusted according to the first power difference obtained by subtracting the maximum power from the set power threshold, and the defrosting time or defrosting time is negatively correlated with the first power difference.

[0097] When the maximum power is not greater than the set power threshold, the outdoor unit's self-cleaning frosting time or the indoor unit's self-cleaning defrosting time is adjusted according to the second power difference obtained by subtracting the set power threshold from the maximum power, and the frosting time or defrosting time is positively correlated with the second power difference.

[0098] In the second control process, although the relationship between the real-time air conditioner target power and the real-time photovoltaic output power is not considered, the defrosting or frosting time is adjusted based on the relationship between the maximum photovoltaic power and the known set power threshold. Furthermore, if the maximum power is greater than the set power threshold, it indicates that the photovoltaic output power is sufficient, and the compressor can self-clean at a higher frequency, thus shortening the frosting or defrosting time. The larger the first power difference obtained by subtracting the maximum power from the set power threshold, the more sufficient the photovoltaic output power, and the shorter the defrosting or frosting time can be. Therefore, when determining the frosting or defrosting time based on the first power difference obtained by subtracting the maximum power from the set power threshold, a negative correlation is used: the larger the power difference, the shorter the determined frosting or defrosting time, improving the self-cleaning speed of the photovoltaic air conditioner. Conversely, if the maximum power is less than the set power threshold, it indicates that the photovoltaic output power is limited; the larger the second power difference obtained by subtracting the maximum power from the set power threshold, the more insufficient the photovoltaic output power. When determining the defrosting or frosting time based on the second power difference, the positive correlation is utilized: the larger the power difference, the longer the determined defrosting or frosting time. The extended operating time is used to solve problems such as insufficient frosting due to insufficient photovoltaic output power or compressor frequency reduction, which affects the self-cleaning effect, or incomplete defrosting affecting the heat exchanger's heat exchange performance.

[0099] In some other embodiments, during the second control process, the preset frosting time and preset defrosting time of the photovoltaic air conditioner under rated power conditions are adjusted to match the performance of the photovoltaic air conditioner itself.

[0100] Specifically, adjust the defrosting time of the outdoor unit's self-cleaning function or the defrosting time of the indoor unit's self-cleaning function based on the first power difference, including:

[0101] The first adjustment value for the frosting time of the outdoor unit's self-cleaning is determined based on the first power difference. The difference between the set frosting time of the outdoor unit's self-cleaning and the first adjustment value is determined as the actual frosting time of the outdoor unit's self-cleaning. The first adjustment value for the frosting time is a positive number and is positively correlated with the first power difference. The actual frosting time obtained thus is negatively correlated with the first power difference.

[0102] Alternatively, a first adjustment value for the defrosting time of the indoor unit's self-cleaning can be determined based on the first power difference. The difference between the set defrosting time of the indoor unit's self-cleaning and the first adjustment value is then determined as the actual defrosting time of the indoor unit's self-cleaning. The first adjustment value for the defrosting time is a positive number and is positively correlated with the first power difference. The actual defrosting time obtained in this way is negatively correlated with the first power difference.

[0103] The defrosting time of the outdoor unit's self-cleaning function or the defrosting time of the indoor unit's self-cleaning function is adjusted based on the second power difference, specifically including:

[0104] The second adjustment value for the frosting time of the outdoor unit's self-cleaning is determined based on the second power difference. The sum of the set frosting time for the outdoor unit's self-cleaning and the second adjustment value is determined as the actual frosting time for the outdoor unit's self-cleaning. The second adjustment value for the frosting time is a positive number and is positively correlated with the second power difference. The actual frosting time determined in this way is positively correlated with the second power difference.

[0105] Alternatively, a second adjustment value for the defrosting time of the indoor unit's self-cleaning can be determined based on the second power difference. The sum of the set defrosting time for the indoor unit's self-cleaning and the second adjustment value is then used to determine the actual defrosting time for the indoor unit's self-cleaning. The second adjustment value for the defrosting time is a positive number and is positively correlated with the second power difference. The actual defrosting time determined in this way maintains a positive correlation with the second power difference.

[0106] The method for obtaining the maximum power point of photovoltaics by multi-power peak scanning can be implemented using existing technologies.

[0107] In other instances, to improve scanning speed and accuracy, photovoltaic multi-power peak scanning is performed to obtain the photovoltaic maximum power point, specifically including:

[0108] On the photovoltaic power-voltage curve, the operating point where the voltage is the open-circuit voltage is used as the initial search point. The search proceeds in the direction of decreasing voltage until the first peak power point is found. The first voltage and the first power corresponding to the first peak power point are recorded. The search method employs existing technologies, such as the perturbation-observation method.

[0109] The difference voltage is determined based on the first voltage, and the difference voltage is less than the first voltage. The specific determination method is preset.

[0110] The operating point where the voltage equals the voltage difference is used as the new starting point for the search. The peak power point found in the subsequent search is recorded as the most recent peak power point, and the voltage and power corresponding to the most recent peak power point are recorded.

[0111] The sum of the voltage corresponding to the most recent peak power point and the voltage difference is used as the voltage of the next search starting point;

[0112] Before continuing the search, first determine whether the difference between the first voltage and the voltage of the next search starting point is less than the difference voltage; if not, take the operating point with a voltage equal to the voltage of the next search starting point as the new search starting point and continue the search; until the difference between the first voltage and the voltage of the next search starting point is less than the difference voltage, then stop the search.

[0113] It should be understood that if the difference between the first voltage and the voltage of the next search starting point is not less than the difference voltage, the operating point whose voltage equals the voltage of the next search starting point is used as the new search starting point to continue the search. After finding the peak power point, it is taken as the most recent peak power point, and the voltage and power corresponding to the peak power point are recorded. Then, the sum of the voltage corresponding to the peak power point and the difference voltage is used as the voltage of the next search starting point, and the above voltage judgment process is repeated.

[0114] After the search stops, the point with the highest power among all the peak power points found is determined as the photovoltaic maximum power point, and the power of the photovoltaic maximum power point is determined as the maximum power.

[0115] In the aforementioned multi-power peak scanning process, since the operating point with voltage equal to the voltage difference is used as the new search starting point, the magnitude of the voltage difference limits the search range. Furthermore, the sum of the voltage corresponding to the most recent peak power point and the voltage difference is used as the voltage of the next search starting point; therefore, the magnitude of the voltage difference also determines the distance between the next search starting point and the most recent peak power point. Before continuing the search, it is necessary to determine whether the difference between the first voltage and the voltage of the next search starting point is less than the voltage difference; therefore, the magnitude of the voltage difference also determines whether to end the search. Thus, it is clear that the magnitude of the voltage difference plays a crucial role in the multi-power peak scanning process, affecting both the search speed and the search accuracy.

[0116] In some embodiments, a method for calculating the difference voltage based on the first voltage can be determined based on experiments or experience.

[0117] In some embodiments, determining the difference voltage based on the first voltage specifically includes:

[0118] The number N of solar panels connected in series in the photovoltaic array is obtained. A differential voltage is determined based on a first voltage and the number N, with the differential voltage positively correlated with the first voltage and negatively correlated with the number N. The more solar panels connected in series in the photovoltaic array, the greater the photovoltaic output power, but also the greater the susceptibility to environmental influences and the more peak power points. Setting the differential voltage to be negatively correlated with the number N of solar panels—a larger number N results in a smaller differential voltage—increases the search range and search frequency, thereby improving the search speed and accuracy of the maximum power point.

[0119] Figure 2 The diagram shown is a structural schematic of an embodiment of the photovoltaic air conditioner self-cleaning control device of the present invention, which realizes the self-cleaning operation control of the photovoltaic air conditioner.

[0120] like Figure 2As shown, the control device of this embodiment includes structural units, the functions of the structural units, and the relationships between them, as detailed below.

[0121] The control device includes:

[0122] Self-cleaning operation stage determination unit 21 is used to determine the current self-cleaning operation stage of the air conditioner.

[0123] The real-time air conditioning target power acquisition unit 22 is used to acquire the real-time air conditioning target power of the photovoltaic air conditioner.

[0124] The real-time photovoltaic output power acquisition unit 23 is used to acquire the real-time photovoltaic output power of the photovoltaic array in the photovoltaic air conditioner.

[0125] The execution unit 24 is used to execute a first control process when the self-cleaning operation stage determined by the unit 21 is the defrosting process of the outdoor unit self-cleaning or the frosting process of the indoor unit self-cleaning of the photovoltaic air conditioner; and is also used to execute a second control process when the self-cleaning operation stage determined by the unit 21 is the frosting process of the outdoor unit self-cleaning or the defrosting process of the indoor unit self-cleaning of the photovoltaic air conditioner.

[0126] The first control process includes: when the real-time air conditioning target power acquired by the real-time air conditioning target power acquisition unit 22 is greater than the real-time photovoltaic output power acquired by the real-time photovoltaic output power acquisition unit 23, performing photovoltaic multi-power peak scanning to obtain the maximum power of the photovoltaic maximum power point, and controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power; when the real-time air conditioning target power is not greater than the real-time photovoltaic output power, controlling the self-cleaning operation of the photovoltaic air conditioner according to the real-time air conditioning target power.

[0127] The second control process includes: performing a photovoltaic multi-power peak scan to obtain the maximum power of the photovoltaic maximum power point, and controlling the self-cleaning operation of the photovoltaic air conditioner based on the maximum power.

[0128] A photovoltaic air conditioning control device with the above structure runs the corresponding software program, performs the corresponding functions, and follows the instructions. Figure 1 The photovoltaic air conditioner self-cleaning control method embodiment and other embodiments shown in the figure implement the photovoltaic air conditioner self-cleaning control process to achieve the technical effect corresponding to the method embodiment.

[0129] Other embodiments of the present invention also provide a computer storage medium on which a computer program is stored, and when the computer program is executed by a processor, it implements... Figure 1 The embodiments and other embodiments provide a photovoltaic air conditioner self-cleaning control method, and achieve the technical effects of the corresponding embodiments.

[0130] The aforementioned computer storage media can be implemented using any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The computer storage media can be any available storage medium accessible to general-purpose or special-purpose computers.

[0131] In some embodiments, a computer storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. Both the processor and the storage medium can reside in application-specific integrated circuits (ASICs). Of course, the processor and storage medium can also exist as discrete components in the device.

[0132] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A self-cleaning control method for photovoltaic air conditioners, characterized in that, The method includes: When the photovoltaic air conditioner performs the defrosting process of outdoor unit self-cleaning or the frosting process of indoor unit self-cleaning, the following first control process is executed: Obtain the real-time target power of the photovoltaic air conditioner and the real-time photovoltaic output power of the photovoltaic array; When the real-time air conditioning target power is greater than the real-time photovoltaic output power, a photovoltaic multi-power peak scan is performed to obtain the maximum power of the photovoltaic maximum power point, and the self-cleaning operation of the photovoltaic air conditioner is controlled according to the maximum power; when the real-time air conditioning target power is not greater than the real-time photovoltaic output power, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the real-time air conditioning target power. When the photovoltaic air conditioner performs the outdoor unit self-cleaning frosting process or the indoor unit self-cleaning defrosting process, the following second control process is executed: A photovoltaic multi-power peak scan is performed to obtain the maximum power of the photovoltaic maximum power point, and the self-cleaning operation of the photovoltaic air conditioner is controlled based on the maximum power.

2. The photovoltaic air conditioner self-cleaning control method according to claim 1, characterized in that, In the first control process, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the maximum power, specifically including: Obtain the power difference between the real-time target power of the air conditioner and the real-time output power of the photovoltaic system; The defrosting time of the outdoor unit or the frosting time of the indoor unit is adjusted according to the power difference, and the defrosting time or frosting time is positively correlated with the power difference.

3. The photovoltaic air conditioner self-cleaning control method according to claim 2, characterized in that, Adjusting the defrosting time of the outdoor unit's self-cleaning function or the frosting time of the indoor unit's self-cleaning function based on the power difference specifically includes: The adjustment value of the defrosting time for the outdoor unit's self-cleaning is determined based on the power difference. The sum of the set defrosting time for the outdoor unit's self-cleaning and the adjustment value of the defrosting time is determined as the actual defrosting time for the outdoor unit's self-cleaning. The adjustment value of the defrosting time is a positive number and is positively correlated with the power difference. Alternatively, the adjustment value of the frosting time for the indoor unit's self-cleaning can be determined based on the power difference, and the sum of the set frosting time for the indoor unit's self-cleaning and the adjustment value of the frosting time can be determined as the actual frosting time for the indoor unit's self-cleaning; the adjustment value of the frosting time is a positive number and is positively correlated with the power difference.

4. The photovoltaic air conditioner self-cleaning control method according to claim 1, characterized in that, In the first control process, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the real-time target power of the air conditioner, specifically including: The defrosting time for the outdoor unit's self-cleaning function is set to a defrosting time, or the frosting time for the indoor unit's self-cleaning function is set to a frosting time.

5. The photovoltaic air conditioner self-cleaning control method according to claim 1, characterized in that, In the second control process, the self-cleaning operation of the photovoltaic air conditioner is controlled according to the maximum power, specifically including: Compare the maximum power with a set power threshold. When the maximum power is greater than the set power threshold, the defrosting time of the outdoor unit self-cleaning or the defrosting time of the indoor unit self-cleaning is adjusted according to the first power difference obtained by subtracting the maximum power from the set power threshold, and the defrosting time or defrosting time is negatively correlated with the first power difference. When the maximum power is not greater than the set power threshold, the defrosting time of the outdoor unit self-cleaning or the defrosting time of the indoor unit self-cleaning is adjusted according to the second power difference obtained by subtracting the set power threshold from the maximum power, and the defrosting time or defrosting time is positively correlated with the second power difference.

6. The photovoltaic air conditioner self-cleaning control method according to claim 5, characterized in that, Adjusting the defrosting time of the outdoor unit's self-cleaning function or the defrosting time of the indoor unit's self-cleaning function based on the first power difference, specifically including: The first adjustment value for the frosting time of the outdoor unit self-cleaning is determined based on the first power difference. The difference between the set frosting time of the outdoor unit self-cleaning and the first adjustment value for the frosting time is determined as the actual frosting time of the outdoor unit self-cleaning. The first adjustment value for the frosting time is a positive number and is positively correlated with the first power difference. Alternatively, a first adjustment value for the defrosting time of the indoor unit's self-cleaning can be determined based on the first power difference, and the difference between the set defrosting time of the indoor unit's self-cleaning and the first adjustment value for the defrosting time can be determined as the actual defrosting time of the indoor unit's self-cleaning; the first adjustment value for the defrosting time is a positive number and is positively correlated with the first power difference; Adjust the defrosting time of the outdoor unit's self-cleaning function or the defrosting time of the indoor unit's self-cleaning function based on the second power difference, specifically including: The second adjustment value for the frosting time of the outdoor unit self-cleaning is determined based on the second power difference. The sum of the set frosting time of the outdoor unit self-cleaning and the second adjustment value of the frosting time is determined as the actual frosting time of the outdoor unit self-cleaning. The second adjustment value of the frosting time is a positive number and is positively correlated with the second power difference. Alternatively, a second adjustment value for the defrosting time of the indoor unit's self-cleaning can be determined based on the second power difference, and the sum of the set defrosting time of the indoor unit's self-cleaning and the second adjustment value of the defrosting time can be determined as the actual defrosting time of the indoor unit's self-cleaning; the second adjustment value of the defrosting time is a positive number and is positively correlated with the second power difference.

7. The self-cleaning control method for photovoltaic air conditioning according to any one of claims 1 to 6, characterized in that, Performing the photovoltaic multi-power peak scan to obtain the maximum power of the photovoltaic maximum power point specifically includes: On the photovoltaic power-voltage curve, the operating point with the open-circuit voltage is taken as the initial search point. The search proceeds in the direction of decreasing voltage until the first peak power point is found. The first voltage and the first power corresponding to the first peak power point are recorded. The difference voltage is determined based on the first voltage; the difference voltage is less than the first voltage. The operating point where the voltage equals the voltage difference is used as the new search starting point to continue the search. The peak power point found in the subsequent search is recorded as the most recent peak power point, and the voltage and power corresponding to the most recent peak power point are recorded. The sum of the voltage corresponding to the most recent peak power point and the difference voltage is used as the voltage of the next search starting point; Determine whether the difference between the first voltage and the voltage of the next search starting point is less than the difference voltage; if not, take the operating point with a voltage equal to the voltage of the next search starting point as the new search starting point and continue searching; until the difference between the first voltage and the voltage of the next search starting point is less than the difference voltage, then stop searching; After the search stops, the point with the highest power among all the peak power points found is determined as the photovoltaic maximum power point, and the power of the photovoltaic maximum power point is determined as the maximum power.

8. The photovoltaic air conditioner self-cleaning control method according to claim 7, characterized in that, Determining the difference voltage based on the first voltage specifically includes: The number N of the photovoltaic array connected in series is obtained, and the difference voltage is determined based on the first voltage and the number N. The difference voltage is positively correlated with the first voltage and negatively correlated with the number N.

9. A self-cleaning control device for photovoltaic air conditioners, characterized in that, The device includes: The self-cleaning operation phase determination unit is used to determine the current self-cleaning operation phase of the air conditioner. A real-time air conditioning target power acquisition unit is used to acquire the real-time air conditioning target power of the photovoltaic air conditioner. A real-time photovoltaic output power acquisition unit is used to acquire the real-time photovoltaic output power of the photovoltaic array in a photovoltaic air conditioner. The execution unit is used to execute a first control process when the photovoltaic air conditioner performs the defrosting process of the outdoor unit self-cleaning or the frosting process of the indoor unit self-cleaning; it is also used to execute a second control process when the photovoltaic air conditioner performs the frosting process of the outdoor unit self-cleaning or the defrosting process of the indoor unit self-cleaning. The first control process includes: when the real-time air conditioner target power is greater than the real-time photovoltaic output power, performing photovoltaic multi-power peak scanning to obtain the maximum power of the photovoltaic maximum power point, and controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power; when the real-time air conditioner target power is not greater than the real-time photovoltaic output power, controlling the self-cleaning operation of the photovoltaic air conditioner according to the real-time air conditioner target power. The second control process includes: performing a photovoltaic multi-power peak scan to obtain the maximum power of the photovoltaic maximum power point, and controlling the self-cleaning operation of the photovoltaic air conditioner according to the maximum power.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the photovoltaic air conditioner self-cleaning control method according to any one of claims 1 to 8.

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