Photovoltaic air conditioning system and control method thereof

Abstract

The present invention discloses a photovoltaic air-conditioning system and a control method thereof, the system comprising: a host, comprising a photovoltaic current conversion control system and a host air-conditioning system; a slave, comprising a slave air-conditioning system, and being communicatively connected with the photovoltaic current conversion control system; the host further comprising: an information acquisition unit, for acquiring environmental information collected and sent by all slaves through the photovoltaic current conversion control system, and acquiring the initial priority order of all slaves; a weight allocation unit, for allocating a weight to each slave; a weight addition unit, for weight addition of the initial priority order through the weight corresponding to each slave, to obtain the final priority order of the slave; a slave power supply unit, for supplying power to each slave according to the final priority order. The present invention adopts the form of cooperation between the host and the slave, and performs load operation management on the slave through the photovoltaic current conversion control system, thereby both improving the scope of application of the photovoltaic air-conditioning and ensuring the stability of the photovoltaic air-conditioning.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic air conditioning, and in particular to a photovoltaic air conditioning system and a control method thereof. Background Art

[0002] At present, in order to achieve the goals of carbon peak and carbon neutrality, the use of clean energy to replace existing energy models has become increasingly popular. Among them, the cost and efficiency of photovoltaics are constantly improving and improving, and household photovoltaics have grown greatly. Therefore, the local consumption of photovoltaic power generation will become an increasingly important part, and accordingly, photovoltaic air conditioners have come into being. The so-called photovoltaic air conditioner is to use photovoltaic solar power generation to drive the operation of air conditioners. Existing photovoltaic air conditioners mainly tend to be large-capacity units such as commercial and light commercial use. In other words, current photovoltaic air conditioners are not suitable for small households or environments that require flexible arrangement of cooling capacity. In addition, due to the lack of better load operation management, the current photovoltaic air conditioners lack stability and are not reliable during operation. Summary of the invention

[0003] The embodiments of the present invention provide a photovoltaic air-conditioning system and a control method thereof, aiming to improve the application scope and practicality of the photovoltaic air-conditioning and ensure the stability of the photovoltaic air-conditioning system.

[0004] An embodiment of the present invention provides a photovoltaic air conditioning system, comprising:

[0005] Host, including photovoltaic inverter control system and host air conditioning system,

[0006] At least one slave machine, each of the slave machines comprises a slave machine air conditioning system, and each of the slave machines is communicatively connected with the photovoltaic power conversion control system;

[0007] Wherein, the host supplies power to the host air conditioning system and the slave air conditioning system through the photovoltaic power conversion control system;

[0008] The host also includes:

[0009] An information acquisition unit, used to acquire environmental information collected and sent by all slaves through the photovoltaic power conversion control system, and to acquire the initial priority order of all slaves;

[0010] a weight allocation unit, configured to allocate a weight to each slave according to the environmental information and the initial priority order;

[0011] A weight adding unit, used for performing weight adding on the initial priority order by the weight corresponding to each slave machine to obtain the final priority order of the slave machines;

[0012] The slave power supply unit is used to supply power to each slave according to the final priority order based on the photovoltaic power conversion control system.

[0013] The embodiment of the present invention further provides a photovoltaic air conditioning control method, which is applicable to the photovoltaic air conditioning system as described above, comprising:

[0014] The host obtains the environmental information collected and sent by all slaves through the photovoltaic power conversion control system, and obtains the initial priority order of all slaves;

[0015] assigning a weight to each slave according to the environmental information and the initial priority order;

[0016] The initial priority order is weighted by the weight corresponding to each slave to obtain the final priority order of the slaves;

[0017] Based on the photovoltaic power conversion control system, each slave machine is powered according to the final priority order.

[0018] The photovoltaic air conditioning system provided in this embodiment has the characteristics of a host and a slave, wherein the host has both a photovoltaic current conversion control system and an air conditioning system, which can provide a DC power supply for the air conditioning system of the host and / or the slave by accessing photovoltaic panels and alternating current, while the slave only has an air conditioning system, which is powered by the host. The combination of the host and the slave can achieve a flexible installation effect, and the number of hosts and slaves can be selected according to the actual situation of the residence. At the same time, the slave does not need a current conversion system, which can greatly reduce costs. Compared with the existing photovoltaic multi-split system, this embodiment has the advantages of convenient installation (can be installed before and after decoration) and flexible use (independent switches for different host and slave refrigeration systems). In addition, this embodiment, on the basis of the host and the slave, meets the total load requirements of the host power supply, prevents the overall photovoltaic air conditioning system from operating overload for a long time and aggravates the system's own losses, and also increases the reliability of the photovoltaic air conditioning through the coordinated operation logic of the host and the slave. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 A system architecture diagram of a photovoltaic air conditioning system provided by an embodiment of the present invention;

[0021] Figure 2 A schematic block diagram of a host in a photovoltaic air conditioning system provided by an embodiment of the present invention;

[0022] Figure 3 A host system architecture diagram in a photovoltaic air conditioning system provided by an embodiment of the present invention;

[0023] Figure 4 A schematic flow chart of a photovoltaic air conditioning control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] See below Figure 1 , an embodiment of the present invention provides a photovoltaic air conditioning system, comprising:

[0029] Host, including photovoltaic inverter control system and host air conditioning system,

[0030] At least one slave machine, each of the slave machines comprises a slave machine air conditioning system, and each of the slave machines is communicatively connected with the photovoltaic power conversion control system;

[0031] Wherein, the host supplies power to the host air conditioning system and the slave air conditioning system through the photovoltaic power conversion control system;

[0032] like Figure 2 As shown, the host also includes:

[0033] The information acquisition unit 201 is used for the host to acquire the environmental information collected and sent by all slaves through the photovoltaic power conversion control system, and to acquire the initial priority order of all slaves;

[0034] A weight allocation unit 202, configured to allocate a weight to each slave according to the environment information and the initial priority order;

[0035] A weight adding unit 203, configured to perform weight adding on the initial priority order by using the weight corresponding to each slave to obtain a final priority order of the slaves;

[0036] The slave power supply unit 204 is used to supply power to each slave according to the final priority order based on the photovoltaic power conversion control system.

[0037] The photovoltaic air conditioning system provided in this embodiment has the characteristics of a host and a slave, wherein the host has both a photovoltaic current conversion control system and an air conditioning system, which can provide a DC power supply for the air conditioning system of the host and / or the slave by accessing photovoltaic panels and alternating current, while the slave only has an air conditioning system, which is powered by the host. The combination of the host and the slave can achieve a flexible installation effect, and the number of hosts and slaves can be selected according to the actual situation of the residence. At the same time, the slave does not need a current conversion system, which can greatly reduce costs. Compared with the existing photovoltaic multi-split system, this embodiment has the advantages of convenient installation (can be installed before and after decoration) and flexible use (independent switches for different host and slave refrigeration systems). In addition, this embodiment, on the basis of the host and the slave, meets the total load requirements of the host power supply, prevents the overall photovoltaic air conditioning system from operating overload for a long time and aggravates the system's own losses, and also increases the reliability of the photovoltaic air conditioning through the coordinated operation logic of the host and the slave.

[0038] Specifically, in addition to controlling the reasonable operation of its own host air-conditioning system through the photovoltaic power conversion control system, the host will also obtain the environmental information reported by each slave and the priority order between the slaves (i.e., the initial priority order), thereby assigning a weight to each slave to form a more reasonable priority order related to the environmental information, i.e., the final priority order, and then powering each slave according to the final priority order to achieve reasonable load management and ensure the stability and reliability of the overall photovoltaic air-conditioning system.

[0039] Combination Figure 3As shown, the host includes a photovoltaic inverter control system and a host air conditioning system, wherein the host air conditioning system includes an outdoor unit and an indoor unit, wherein the outdoor unit includes an outdoor unit controller, a compressor, an outdoor fan, a heat exchanger and a connection component, and the indoor unit includes an indoor unit controller, an indoor fan, a heat exchanger and a connection component. It can be understood that the components in the slave air conditioning system of the slave are the same as those of the host air conditioning system, that is, the slave air conditioning system includes an outdoor unit and an indoor unit, wherein the outdoor unit and the indoor unit are the same as the corresponding parts of the host air conditioning system.

[0040] Figure 4 A schematic flow chart of a photovoltaic air-conditioning control method provided in an embodiment of the present invention is provided. The method is applicable to the photovoltaic air-conditioning system as described above, and specifically comprises steps S401 to S404.

[0041] S401, the host obtains the environmental information collected and sent by all slaves through the photovoltaic power conversion control system, and obtains the initial priority order of all slaves;

[0042] S402, assigning a weight to each slave according to the environmental information and the initial priority order;

[0043] S403, weighting the initial priority order by the weight corresponding to each slave to obtain a final priority order of the slaves;

[0044] S404: Based on the photovoltaic power conversion control system, power each slave machine according to the final priority order.

[0045] In this embodiment, the host obtains the environmental information reported by each slave and the priority order among the slaves (i.e., the initial priority order) through the photovoltaic power conversion control system, and assigns a weight to each slave to form a more reasonable priority order related to the environmental information, i.e., the final priority order. Then, each slave is powered according to the final priority order to achieve reasonable load management and ensure the stability and reliability of the overall photovoltaic air-conditioning system.

[0046] In this embodiment, the host has both a photovoltaic inverter control system and an air-conditioning system, which can provide a DC power supply for the air-conditioning system of the host and / or the slave by connecting to the photovoltaic panel and the AC power, while the slave only has an air-conditioning system, which is powered by the host. The combination of the host and the slave can achieve a flexible installation effect, and the number of hosts and slaves can be selected according to the actual situation of the house. At the same time, the slave does not need a inverter system, which can greatly reduce costs. Compared with the existing photovoltaic multi-split system, this embodiment has the advantages of convenient installation (can be installed before and after decoration) and flexible use (different hosts and slave refrigeration systems have independent switches). In addition, this embodiment, on the basis of the host and the slave, meets the total load requirements of the host power supply, prevents the overall photovoltaic air-conditioning system from operating overload for a long time and aggravates the system's own losses, and also increases the reliability of the photovoltaic air-conditioning through the coordinated operation logic of the host and the slave.

[0047] In a specific application scenario, the host allocates the DC power required by each slave. Optionally, the host has a rectifier system, so that when the photovoltaic DC power supply is insufficient, the AC power of the power grid can be rectified into DC power to supply itself and other slaves; Optionally, the host has a storage battery, so that when the air-conditioning load is less than the photovoltaic power generation, excess photovoltaic power can be stored; Optionally, the host has an inverter system, which converts photovoltaic power into AC power and transmits it back to the power grid when the battery is full and the air-conditioning is not loaded. In general, the host controls the operation of the slaves and is the calculation, processing, and control center of the entire photovoltaic air-conditioning system, and has all the functions of a slave. The slave collects the environmental information of its internal and external machines, and feeds it back to the host in the form of pulsed electrical signals (or WIFI, Bluetooth, etc.). The environmental information includes but is not limited to the indoor environmental temperature and humidity, outdoor environmental temperature and humidity, and the temperature of each key node of the system. In addition, if Figure 1 As shown, the slave can also transmit the user demand signal to the master.

[0048] In one embodiment, the environmental information includes the number of people within the air conditioning coverage area and the outdoor ambient temperature;

[0049] The step S402 includes:

[0050] In different operation modes, the outdoor environment temperature is compared with a preset external temperature threshold, and the weight of each slave is calculated according to the comparison result.

[0051] During the operation of the photovoltaic air conditioner, the corresponding working conditions of each host and slave, the number of people (the air conditioner is equipped with an infrared detection device to detect the number of people indoors covered by the corresponding air conditioner range), the number of startups, and the set priority of each host (slave) are weighted and added. Through logical control, the total load ratio corresponding to each host (slave) is finally obtained, or the final priority order. When the total load exceeds the limit value, under the condition of this load ratio, or according to the final priority order, the corresponding slave is subjected to corresponding frequency reduction processing. Here, the preset external ring temperature threshold refers to the pre-set outdoor ambient temperature threshold.

[0052] In a specific embodiment, in different operation modes, the outdoor environment temperature is compared with a preset external temperature threshold, and the weight of each slave is calculated according to the comparison result, including:

[0053] In cooling mode, when the outdoor ambient temperature is greater than or equal to the first external ambient temperature threshold, the weight is calculated according to the following formula:

[0054] ωn=K1*(Tn-a)*Xn / n

[0055] Wherein, ωn represents the weight, Tn represents the outdoor ambient temperature, K1 and a represent different constants, Xn represents the number of people within the air conditioning coverage area, n represents the priority level, n=1, 2, 3...;

[0056] When the outdoor ambient temperature is greater than or equal to the second external ambient temperature threshold and less than the first external ambient temperature threshold, the weight is calculated according to the following formula:

[0057] ωn=K2*(Tn-a)*Xn / n

[0058] In the formula, K2 represents a constant;

[0059] When the outdoor ambient temperature is greater than or equal to the third external ambient temperature threshold and less than the second external ambient temperature threshold, the weight is calculated according to the following formula:

[0060] ωn=K3 / (a-Tn)*Xn / n

[0061] Where, K3 represents a constant;

[0062] Among them, the first external ring temperature threshold is greater than the second external ring temperature threshold, and the second external ring temperature threshold is greater than the third external ring temperature threshold.

[0063] In this embodiment, in the cooling mode, the outdoor ambient temperature is compared with the preset external ring temperature threshold, so as to calculate the weight by using an appropriate calculation method. The preset external ring temperature threshold specifically includes a first external ring temperature threshold, a second external ring temperature threshold, and a third external ring temperature threshold, wherein the first external ring temperature threshold is greater than the second external ring temperature threshold, and the second external ring temperature threshold is greater than the third external ring temperature threshold.

[0064] For example, the first outer ring temperature threshold is 35°C, the second outer ring temperature threshold is 23°C, and the third outer ring temperature threshold is 15°C, that is, when Tn≥35°C, the weight ωn=K1*(Tn-23)*Xn / n, (K1 is the weight coefficient when Tn≥35°C, and the final value is determined according to the actual situation); when 23°C≤Tn<35°C, the weight ωn=K2*(Tn-23)*Xn / n, (K2 is the weight coefficient when Tn<35°C, and the final value is determined according to the actual situation); when 15°C≤Tn<23°C, ωn=K3 / (23-Tn)*Xn / n, (K3 is the weight coefficient when 15°C≤Tn<23°C, and the final value is determined according to the actual situation).

[0065] In another specific embodiment, the outdoor ambient temperature is compared with a preset external ambient temperature threshold, and the weight of each slave is calculated according to the comparison result, further comprising:

[0066] In the heating mode, when the outdoor ambient temperature is less than or equal to the fourth outer ring temperature threshold, the weight is calculated according to the following formula:

[0067] ωn=K4*(b-Tn)*Xn / n

[0068] In the formula, K4 and b represent different constants respectively.

[0069] When the outdoor ambient temperature is greater than the fourth external ambient temperature threshold and less than or equal to the fifth external ambient temperature threshold, the weight is calculated according to the following formula:

[0070] ωn=K5 / (Tn-b)*Xn / n

[0071] Where, K5 represents a constant;

[0072] Among them, the fourth outer ring temperature threshold is smaller than the third outer ring temperature threshold, and the fifth outer ring temperature threshold is larger than the second outer ring temperature threshold and smaller than the first outer ring temperature threshold.

[0073] In this embodiment, in the heating mode, the outdoor ambient temperature is compared with the preset outer ring temperature threshold, where the fourth outer ring temperature threshold and the fifth outer ring temperature threshold also belong to the preset outer ring temperature threshold. For example, the fourth outer ring temperature threshold is 10°C, and the fifth outer ring temperature threshold is 25°C, that is, when Tn≤10°C, the weight ωn=K4*(10-Tn)*Xn / n, (K4 is the weight coefficient when Tn≤10°C, and the final value is determined according to the actual situation); when the outer ring is 10°C<Tn≤25°C, the weight ωn=K5 / (Tn--10)*Xn / n, (K4 is the weight coefficient when Tn≤10°C, and the final value is determined according to the actual situation).

[0074] Furthermore, according to the weights calculated according to the above content, the initial priority order can be weighted to obtain the final priority order:

[0075] αn=ωn / k

[0076] In the formula, αn is the final priority order, ωn is the weight, and k represents the total number of air conditioners turned on.

[0077] In one embodiment, the step S404 includes:

[0078] Get the number of slaves and compare the current total load with the preset load threshold;

[0079] A power supply strategy is generated according to the load comparison result, the number of slaves and the final priority order, and the power supply load of each slave is controlled using the power supply strategy.

[0080] In this embodiment, a corresponding power supply strategy can be generated according to the number of slaves and the load comparison result between the current total load of the photovoltaic air-conditioning system and the preset load threshold. Based on the power supply strategy, the load of the slaves can be managed to ensure that the overall photovoltaic air-conditioning system can operate stably and reliably.

[0081] In a specific embodiment, generating a power supply strategy according to the load comparison result, the number of slaves and the final priority order, and using the power supply strategy to control the power supply load of each slave includes:

[0082] When the number of slaves is greater than or equal to a first number threshold and less than or equal to a second number threshold, obtaining a load comparison result;

[0083] If the load comparison result is that the current total load is greater than the first load threshold, load reduction management is performed on the slave machine according to the final priority order;

[0084] If the load comparison result is that the current total load is greater than the second load threshold, the first m slaves with the highest final priority order are selected for power supply, and the other slaves are subjected to the first frequency reduction processing until the current total load is less than or equal to the third load threshold; wherein the first load threshold is less than the third load threshold, the third load threshold is less than the second load threshold, and m≥1;

[0085] If the load comparison result is that the current total load is greater than the fourth load threshold, the first m slaves with the highest final priority order are selected for power supply, and the other slaves are subjected to the second frequency reduction processing until the current total load is less than or equal to the third load threshold; wherein the second load threshold is less than the fourth load threshold;

[0086] If the load comparison result is that the current total load is greater than the fifth load threshold, the slave with the lowest final priority order is selected for shutdown and restart processing, and the operating frequencies of other slaves are maintained. After the restart is completed, the current total load is re-compared with the preset load threshold until the current total load is less than the sixth load threshold, or the slaves are stopped in order from low to high according to the final priority order; wherein the fifth load threshold is greater than the fourth load threshold, and the sixth load threshold is less than the first load threshold.

[0087] In this embodiment, under different load comparison results, different power supply strategies are implemented for the slaves. For example, the first quantity threshold is 1, the second quantity threshold is 3, that is, when 1 ≤ number of slaves ≤ 3, the load comparison result is obtained. If the current total load exceeds 90% of the maximum load (that is, the first load threshold), different load limit reduction processes are performed according to the load weight priority order of each slave and host (that is, the final priority order), to ensure that the slave (or host) with priority 1 (that is, the highest first m in the final priority order) is supplied with power or continues to increase the frequency, while all other slaves are limited to the current frequency operation. If the current total load exceeds 95% of the maximum load (that is, the second load threshold), the power supply of the slave (or host) with priority 1 is guaranteed (the frequency can continue to increase), and the other slaves are respectively reduced at a speed of 0.5HZ / (s*αn*c) (that is, the first frequency reduction process, where c is a constant, and the final value is determined according to the actual situation) until the total load is less than or equal to 92% of the maximum load. If the current total load exceeds 98% of the maximum load (i.e., the fourth load threshold), the operating frequency of priority 1 is maintained, and all others are reduced in frequency at a rate of 2HZ / (s*αn*c) (i.e., the second frequency reduction process) until the total load is less than or equal to 92% of the maximum load (i.e., the third load threshold). If the current total load exceeds 100% of the maximum load (i.e., the fifth load threshold), the operating frequencies of all master and slave machines except the lowest priority are maintained, and the shutdown process of the last priority is performed, and then restarted and re-judged. When there are three shutdowns due to exceeding 100% load, the machine with the lowest priority will no longer be started until the load is less than 70% of the maximum load (i.e., the sixth load threshold) or it is manually shut down and restarted. Here, if the shutdown still occurs for the fourth time, continue to stop the previous priority, and so on.

[0088] In another specific embodiment, the generating of a power supply strategy according to the load comparison result, the number of slaves and the final priority order, and using the power supply strategy to control the power supply load of each slave, further includes:

[0089] When the number of slaves is greater than a second number threshold, obtaining a load comparison result;

[0090] If the load comparison result is that the current total load is greater than the first load threshold, then the power supply and / or frequency increase processing of the first k slaves with the highest final priority order is guaranteed, and the other slaves are maintained to operate at the current frequency; wherein k≥1 and k>m;

[0091] If the load comparison result is that the current total load is greater than the second load threshold, the first k slaves with the highest final priority order operate at the current frequency, and the other slaves are subjected to the third frequency reduction process until the current total load is less than or equal to the third load threshold; wherein the first load threshold is less than the third load threshold, and the third load threshold is less than the second load threshold;

[0092] If the load comparison result is that the current total load is greater than the fourth load threshold, the first m slaves with the highest priority in the final priority order operate according to the current frequency, and the first frequency reduction processing is performed on the first k slaves with the highest priority in the final priority order, and the second frequency reduction processing is performed on other slaves;

[0093] If the load comparison result is that the current total load is greater than the fifth load threshold, the current operating frequencies of the top m slaves with the highest final priority order are maintained, and the slave with the lowest final priority order is selected for shutdown and restart processing. After the restart is completed, the current total load is re-compared with the preset load threshold until the current total load is less than the sixth load threshold, or the slaves are stopped in order from low to high in the final priority order.

[0094] In addition, in a specific application scenario, the frequency after the first frequency reduction processing is 0.5HZ / (s*αn*c); the frequency after the second frequency reduction processing is 2HZ / (s*αn*c); the frequency after the third frequency reduction processing is 1HZ / (s*αn*c); wherein s represents seconds, αn is the final priority order, and c represents a constant.

[0095] For example, when the number of slaves is ≥3, the load comparison result is obtained. If the current total load exceeds 90% of the maximum load, the power supply of the slaves (or hosts) of priority 1 and 2 is guaranteed (the frequency can continue to be increased), and all other slaves are limited to operate at the current frequency. If the current total load exceeds 95% of the maximum load, the slaves of priority 1 and 2 operate at the current frequency, and the other slaves are respectively reduced in frequency at a speed of 1HZ / (s*αn*c) (i.e., the third frequency reduction processing) until the current total load is less than or equal to 92% of the maximum load. If the current total load exceeds 98% of the maximum load, the operating frequency of priority 1 is maintained, the slaves of priority 2 are reduced in frequency at a speed of 0.5HZ / (s*αn*c), and the other slaves are respectively reduced in frequency at a speed of 2HZ / (s*αn*c) until the total load is less than or equal to 92% of the maximum load. If the current total load exceeds 100% of the maximum load, the operating frequency of priority 1 and 2 is maintained, and the machines with the lowest and second lowest priority are shut down, and then restarted in order of priority to prevent the instantaneous starting current from being too large, and then re-judgment is made. When there are three shutdowns due to exceeding 100% load, the machines with the lowest and second lowest priority will not be started again until the load is lower than 70% of the maximum load or the machine is manually shut down and restarted in order of priority. If the machine still shuts down for the fourth time, continue to stop the previous priority. And so on.

[0096] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of this application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

[0097] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A photovoltaic air conditioning system, characterized in that: include: Host, including photovoltaic inverter control system and host air conditioning system; At least one slave machine, each of the slave machines comprises a slave machine air conditioning system, and each of the slave machines is communicatively connected with the photovoltaic power conversion control system; Wherein, the host supplies power to the host air conditioning system and the slave air conditioning system through the photovoltaic power conversion control system; The host also includes: An information acquisition unit is used for the host to acquire the environmental information collected and sent by all slaves through the photovoltaic power conversion control system, and to acquire the initial priority order of all slaves; a weight allocation unit, configured to allocate a weight to each slave according to the environmental information and the initial priority order; A weight adding unit, used for performing weight adding on the initial priority order by the weight corresponding to each slave machine to obtain the final priority order of the slave machines; A slave power supply unit, configured to supply power to each slave according to the final priority order based on the photovoltaic power conversion control system; The method of supplying power to each slave machine based on the photovoltaic power conversion control system according to the final priority order includes: Get the number of slaves and compare the current total load with the preset load threshold; A power supply strategy is generated according to the load comparison result, the number of slaves and the final priority order, and the power supply load of each slave is controlled using the power supply strategy.

2. A photovoltaic air conditioning control method, applicable to the photovoltaic air conditioning system according to claim 1, characterized in that: include: The host obtains the environmental information collected and sent by all slaves through the photovoltaic power conversion control system, and obtains the initial priority order of all slaves; assigning a weight to each slave according to the environmental information and the initial priority order; The initial priority order is weighted by the weight corresponding to each slave to obtain the final priority order of the slaves; Based on the photovoltaic power conversion control system, supplying power to each slave according to the final priority order; The method of supplying power to each slave machine based on the photovoltaic power conversion control system according to the final priority order includes: Get the number of slaves and compare the current total load with the preset load threshold; A power supply strategy is generated according to the load comparison result, the number of slaves and the final priority order, and the power supply load of each slave is controlled using the power supply strategy.

3. The photovoltaic air conditioning control method according to claim 2, characterized in that: The environmental information includes the number of people within the air conditioning coverage area and the outdoor ambient temperature; The allocating a weight to each slave according to the environment information and the initial priority order comprises: In different operation modes, the outdoor environment temperature is compared with a preset external temperature threshold, and the weight of each slave is calculated according to the comparison result.

4. The photovoltaic air conditioning control method according to claim 3, characterized in that: The outdoor environment temperature is compared with a preset external temperature threshold value under different operation modes, and the weight of each slave is calculated according to the comparison result, including: In cooling mode, when the outdoor ambient temperature is greater than or equal to the first external ambient temperature threshold, the weight is calculated according to the following formula: ωn=K1*(Tn-a)*Xn / n Wherein, ωn represents the weight, Tn represents the outdoor ambient temperature, K1 and a represent different constants, Xn represents the number of people within the air conditioning coverage area, n represents the priority level, n=1, 2, 3...; When the outdoor ambient temperature is greater than or equal to the second external ambient temperature threshold and less than the first external ambient temperature threshold, the weight is calculated according to the following formula: ωn=K2*(Tn-a)*Xn / n In the formula, K2 represents a constant; When the outdoor ambient temperature is greater than or equal to the third external ambient temperature threshold and less than the second external ambient temperature threshold, the weight is calculated according to the following formula: ωn=K3 / (a-Tn)*Xn / n Where, K3 represents a constant; Among them, the first external ring temperature threshold is greater than the second external ring temperature threshold, and the second external ring temperature threshold is greater than the third external ring temperature threshold.

5. The photovoltaic air conditioning control method according to claim 4, characterized in that: The method of comparing the outdoor environment temperature with a preset external temperature threshold in different operation modes and calculating the weight of each slave according to the comparison result also includes: In the heating mode, when the outdoor ambient temperature is less than or equal to the fourth outer ring temperature threshold, the weight is calculated according to the following formula: ωn=K4*(b-Tn)*Xn / n In the formula, K4 and b represent different constants respectively. When the outdoor ambient temperature is greater than the fourth external ambient temperature threshold and less than or equal to the fifth external ambient temperature threshold, the weight is calculated according to the following formula: ωn=K5 / (Tn-b)*Xn / n Where, K5 represents a constant; Among them, the fourth outer ring temperature threshold is smaller than the third outer ring temperature threshold, and the fifth outer ring temperature threshold is larger than the second outer ring temperature threshold and smaller than the first outer ring temperature threshold.

6. The photovoltaic air conditioning control method according to claim 5, characterized in that: The step of weighting the initial priority order by weight corresponding to each slave machine to obtain the final priority order of the slave machines includes: The weight addition is performed according to the following formula: αn=ωn / k In the formula, αn is the final priority order, ωn is the weight, and k represents the total number of air conditioners turned on.

7. The photovoltaic air conditioning control method according to claim 6, characterized in that: The generating of a power supply strategy according to the load comparison result, the number of slaves and the final priority order, and using the power supply strategy to control the power supply load of each slave, includes: When the number of slaves is greater than or equal to a first number threshold and less than or equal to a second number threshold, obtaining a load comparison result; If the load comparison result is that the current total load is greater than the first load threshold, the first m slaves with the highest final priority order are selected for power supply, and other slaves are limited to operate at the current frequency; If the load comparison result is that the current total load is greater than the second load threshold, the first m slaves with the highest final priority order are selected for power supply, and the other slaves are subjected to the first frequency reduction processing until the current total load is less than or equal to the third load threshold; wherein the first load threshold is less than the third load threshold, the third load threshold is less than the second load threshold, and m≥1; If the load comparison result is that the current total load is greater than the fourth load threshold, the first m slaves with the highest final priority order are selected for power supply, and the other slaves are subjected to the second frequency reduction processing until the current total load is less than or equal to the third load threshold; wherein the second load threshold is less than the fourth load threshold; If the load comparison result is that the current total load is greater than the fifth load threshold, the slave with the lowest final priority order is selected for shutdown and restart processing, and the operating frequencies of other slaves are maintained. After the restart is completed, the current total load is re-compared with the preset load threshold until the current total load is less than the sixth load threshold, or the slaves are stopped in order from low to high according to the final priority order; wherein the fifth load threshold is greater than the fourth load threshold, and the sixth load threshold is less than the first load threshold.

8. The photovoltaic air conditioning control method according to claim 7, characterized in that: The method of generating a power supply strategy according to the load comparison result, the number of slaves and the final priority order, and using the power supply strategy to control the power supply load of each slave, further includes: When the number of slaves is greater than a second number threshold, obtaining a load comparison result; If the load comparison result is that the current total load is greater than the first load threshold, then the power supply and / or frequency increase processing of the first k slaves with the highest final priority order is guaranteed, and the other slaves are maintained to operate at the current frequency; wherein k≥1 and k>m; If the load comparison result is that the current total load is greater than the second load threshold, the first k slaves with the highest final priority order operate at the current frequency, and the other slaves are subjected to the third frequency reduction process until the current total load is less than or equal to the third load threshold; wherein the first load threshold is less than the third load threshold, and the third load threshold is less than the second load threshold; If the load comparison result is that the current total load is greater than the fourth load threshold, the first m slaves with the highest priority in the final priority order operate according to the current frequency, and the first frequency reduction processing is performed on the first k slaves with the highest priority in the final priority order, and the second frequency reduction processing is performed on other slaves; If the load comparison result is that the current total load is greater than the fifth load threshold, the current operating frequencies of the top m slaves with the highest final priority order are maintained, and the slave with the lowest final priority order is selected for shutdown and restart processing. After the restart is completed, the current total load is re-compared with the preset load threshold until the current total load is less than the sixth load threshold, or the slaves are stopped in order from low to high in the final priority order.

9. The photovoltaic air conditioning control method according to claim 8, characterized in that: The frequency reduction rate of the first frequency reduction processing is 0.5HZ / (s*αn*c); the frequency reduction rate after the second frequency reduction processing is 2HZ / (s*αn*c); the frequency reduction rate after the third frequency reduction processing is 1HZ / (s*αn*c); wherein s represents seconds, αn represents the final priority order, and c represents a constant.

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