Control method of photovoltaic air conditioning system

Abstract

The invention provides a control method of a photovoltaic air-conditioning system, the photovoltaic air-conditioning system comprises an air conditioner, a photovoltaic power generation assembly capable of supplying power to the air conditioner and a mains supply, and the control method comprises the following steps: after the photovoltaic air-conditioning system is started by an instruction, starting the air conditioner; the real-time power generation power Pa of the photovoltaic power generation assembly and the electricity utilization power Pb of the air conditioner in the normal operation state are obtained; and when Pa is smaller than or equal to Pb, the air conditioner is controlled to operate with reduced power. When the real-time power generation power is not higher than the electricity consumption power of the air conditioner in the normal operation state, the air conditioner is controlled to operate with reduced power, the electricity consumption demand of the air conditioner is actively reduced, the electricity storage capacity demand of an electricity storage component configured in the system can be reduced, the number of photovoltaic panels configured in a photovoltaic power generation assembly is reduced, and the power generation efficiency is improved. And therefore, under the condition that the power generation of the photovoltaic power generation assembly is insufficient, the air conditioner can still maintain operation without shutdown on the premise that commercial power supply is not needed in the daytime, and the basic air conditioning requirement of a user is met.

Description

Technical Field

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

[0002] There are various types of photovoltaic air conditioning equipment on the market, mainly divided into two types: photovoltaic grid-connected (grid-fed) or photovoltaic self-generation and self-use. Although the photovoltaic grid-connected (grid-fed) method can feed back surplus electricity to the local power grid to generate benefits, it is greatly affected by local policies and is prone to interference with the power grid. Photovoltaic self-use can be divided into two types: one is photovoltaic self-use, which realizes the air-conditioning equipment's disconnection from the grid power supply through photovoltaic + energy storage battery. However, the cost of energy storage battery is relatively high. In order to ensure that the energy storage battery can be fully charged during the day and the air-conditioning equipment can maintain normal operation at night, the required photovoltaic panels are too many and the capacity of the energy storage battery is too large, so the recovery period of the investment cost becomes long. In addition, if there is continuous haze weather, the energy storage battery cannot be charged and the role of the energy storage battery will be greatly reduced. In this case, the mains grid is still required to supply power to the air-conditioning equipment to ensure user needs; the other photovoltaic self-use is that the air-conditioning equipment draws electricity from photovoltaics during the day, and draws electricity from the mains grid when photovoltaic power generation is insufficient or at night. The scheme in which photovoltaic power generation will not be fed back to the mains grid is relatively easy to promote. Since this scheme will not feed power to the grid, the interference to the grid is reduced, it is less affected by local policies, and the investment cost is relatively low, so the promotion difficulty is relatively small, but this scheme is greatly restricted by the number of photovoltaic panels installed.

[0003] When the number of photovoltaic panels is too small, although the investment cost is reduced, it is easy to have insufficient photovoltaic power during the day and need to call the city power, or the city power grid stops supplying power due to insufficient photovoltaic power supply. When the number of photovoltaic panels is too large, although full photovoltaic power generation can be achieved during the day, the maximum power generation of photovoltaic panels is limited by the power consumption of air-conditioning equipment, and the surplus solar radiation cannot produce actual benefits. The investment cost is high, and the installation area of ​​photovoltaic panels increases. The minimum number of photovoltaic panels in the current photovoltaic air-conditioning system is mostly configured according to the normal operation of the air conditioner. The number of photovoltaic panels is relatively large. When the photovoltaic power generation is insufficient during the day due to environmental factors, it is necessary to draw power from the city power grid. When the city power grid stops supplying power, the photovoltaic power generation alone is not enough to maintain the normal operation of the air conditioner and shut down. Summary of the invention

[0004] Therefore, the present invention provides a control method for a photovoltaic air-conditioning system, which can solve the technical problem in the prior art that when the photovoltaic power generation is insufficient and the mains power grid stops supplying power, the photovoltaic power generation alone is insufficient to maintain the normal operation of the air-conditioning and causes the system to shut down.

[0005] In order to solve the above problems, the present invention provides a control method for a photovoltaic air conditioning system, wherein the photovoltaic air conditioning system comprises an air conditioner and a photovoltaic power generation component and a mains power supply source capable of supplying power to the air conditioner, comprising the following steps:

[0006] After the photovoltaic air conditioning system is instructed to start, the real-time power generation power Pa of the photovoltaic power generation component and the power consumption power Pb of the air conditioner in normal operation are obtained;

[0007] When Pa≤Pb, the air conditioner is controlled to operate at reduced power.

[0008] In some embodiments, when Pa≤Pb, the following steps are further included:

[0009] Compare the size of Pa and Pc, Pc is the set value of photovoltaic power generation, and Pc<Pb;

[0010] When Pa<Pc, the mains power supply source is controlled to supply power to the air conditioner, and after the mains power supply source successfully supplies power to the air conditioner, the air conditioner is controlled to operate at reduced power.

[0011] In some embodiments, the photovoltaic air conditioning system is equipped with a small power storage component, and the maximum storage capacity of the small power storage component is equal to the power consumption of the air conditioner running at maximum power for a target time;

[0012] When Pa≥Pc, controlling the small power storage component and the photovoltaic power generation assembly to supply power to the air conditioner at the same time, and controlling the air conditioner to operate at a reduced power; or,

[0013] When Pa<Pc, when the mains power supply source is cut off, the small power storage component and the photovoltaic power generation assembly are controlled to supply power to the air conditioner at the same time, and the air conditioner is controlled to operate at a reduced power.

[0014] In some embodiments, when Pa>Pb, it is detected whether the small power storage component is in a fully charged state, and when the small power storage component is not in a fully charged state, the photovoltaic power generation component is controlled to charge the small power storage component; or,

[0015] When the small power storage component and the photovoltaic power generation assembly are simultaneously supplying power to the air conditioner, the discharge current of the small power storage component is detected, and when the discharge current is 0, the AC power supply is attempted to be used to supply power to the air conditioner simultaneously.

[0016] In some embodiments, the photovoltaic power generation component is equipped with a water washing mechanism for cleaning the outer surface of the photovoltaic panel of the photovoltaic power generation component. When Pa>Pb is in operation, the water washing mechanism is controlled to operate.

[0017] In some embodiments, the water washing mechanism includes a water collecting tray, and a semiconductor refrigeration component is arranged in the upper area of ​​the water collecting tray. The cold end of the semiconductor refrigeration component is used to condense moisture in the surrounding air to form condensed water, so as to use the formed condensed water to clean the photovoltaic panel.

[0018] In some embodiments, the water washing mechanism also includes a condensate distribution tray, a bottom plate of which is provided with a plurality of drain holes, the plurality of drain holes being arranged at intervals along the length direction of the top end of the photovoltaic power generation component, and the condensate distribution tray is controllably connected to the water collection space of the water collection tray.

[0019] In some embodiments, the water collecting tray and the condensed water evenly distributed tray are stacked up and down and the water collecting tray closes the top opening of the condensed water evenly distributed tray. A drain outlet is formed on the bottom plate of the water collecting tray. A drain control component is provided on the drain outlet. The drain control component can control the drain outlet to open when the condensed water level in the water collecting tray reaches a high point, and control the drain outlet to be cut off when the condensed water level in the water collecting tray reaches a low point.

[0020] In some embodiments, the drainage control assembly includes a lifting sealing rod, on which a low point switch and a high point switch are fixedly arranged along its height from bottom to top, and a float is also mounted on the lifting sealing rod, and the float is located between the low point switch and the high point switch. A sealing head is provided at the lower end of the lifting sealing rod, and also includes a lifting drive component, which can control the lifting sealing rod to rise when the float contacts the high point switch so that the sealing head is connected to the drain port, and control the lifting sealing rod to descend when the float contacts the low point switch so that the sealing head cuts off the drain port.

[0021] In some embodiments, the air conditioner further includes a water receiving pan and a water pump for receiving condensation generated by its indoor heat exchanger, wherein the water pump can pump the condensation water in the water receiving pan into the water collection pan; and / or the lifting drive component is an electric drive component.

[0022] In some embodiments, when Pa>Pb, the photovoltaic power generation assembly is controlled to supply power to the semiconductor refrigeration component and the lifting drive component to ensure the operation of the semiconductor refrigeration component and the lifting drive component.

[0023] In some embodiments, when the photovoltaic power generation component supplies power to the semiconductor refrigeration component, when the air temperature of the environment in which the semiconductor refrigeration component is located is not lower than a preset temperature value, the semiconductor refrigeration component is controlled to operate.

[0024] In some implementations, controlling the air conditioner to operate at reduced power includes:

[0025] When the operation mode of the air conditioner is a cooling mode, controlling the compressor of the air conditioner to reduce a first frequency every first time; or,

[0026] When the operation mode of the air conditioner is a heating mode, controlling the compressor of the air conditioner to reduce a second frequency every second time; or,

[0027] When the operation mode of the air conditioner is the air supply mode, the wind speed of the indoor fan of the air conditioner is controlled to be lowered.

[0028] In some embodiments, the photovoltaic air-conditioning system has a power-saving mode and a comfort mode. When the photovoltaic air-conditioning system runs in the comfort mode, before obtaining Pa and Pb, it is first determined whether the AC power supply is off. If the AC power supply is off, the photovoltaic air-conditioning system is controlled to switch from the comfort mode to the power-saving mode; if the AC power supply is normally supplied, the relationship between Pa and Pb is further determined, and when Pa>Pb, the photovoltaic power generation component is used to power the air conditioner; when Pa≤Pb, the photovoltaic power generation component and the AC power supply are used to power the air conditioner at the same time.

[0029] The control method of a photovoltaic air conditioning system provided by the present invention has the following beneficial effects:

[0030] When the real-time power generation is not higher than the power consumption of the air conditioner under normal operating conditions, the air conditioner is controlled to operate at a lower power level to actively reduce its power consumption demand. This can reduce the power storage capacity demand of the power storage components configured in the system on the one hand, and on the other hand, can reduce the number of photovoltaic panels configured in the photovoltaic power generation assembly. Further, when the photovoltaic power generation assembly generates insufficient power, the air conditioner can still maintain operation without shutting down during the day without the need for AC power supply (for example, when the AC power is off), thereby meeting the user's basic air conditioning needs. In addition, the photovoltaic power generation assembly does not need to be equipped with too many photovoltaic panels, which can reduce the cost investment of photovoltaic panels and is conducive to the market promotion of photovoltaic air-conditioning systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0032] Figure 1 It is a schematic diagram of the principle of a photovoltaic air conditioning system according to an embodiment of the present invention (including a partial structural diagram);

[0033] Figure 2 It is a schematic diagram of the principle of a photovoltaic air conditioning system according to another embodiment of the present invention (including a partial structural diagram);

[0034] Figure 3 It is a partial structural schematic diagram of a photovoltaic power generation component in the photovoltaic air conditioning system of the present invention;

[0035] Figure 4 is a schematic diagram of the partial structure of the photovoltaic power generation assembly in the photovoltaic air conditioning system of the present invention from another perspective;

[0036] Figure 5 yes Figure 2 A schematic diagram of a power supply when the photovoltaic air conditioning system in the power saving mode and the air conditioner in the cooling mode, in which the photovoltaic power generation components and the small power storage components supply power to the air conditioner at the same time;

[0037] Figure 6 yes Figure 5 Schematic diagram of the state of the small storage component after discharge;

[0038] Figure 7 yes Figure 2 Another power supply schematic diagram when the photovoltaic air conditioning system in FIG. 1 operates in power saving mode or comfort mode and the air conditioner operates in cooling mode, in which the photovoltaic power generation component and the mains power supply simultaneously supply power to the air conditioner;

[0039] Figure 8 yes Figure 2 Another power supply schematic diagram of the photovoltaic air conditioning system in the comfort mode and the air conditioner in the cooling mode. In the figure, the photovoltaic power generation component has sufficient power generation to supply power to the air conditioner alone and charge the small storage component;

[0040] Fig. 9 yes Figure 2 Another power supply diagram when the photovoltaic air conditioning system in the figure runs in the comfort mode and the air conditioner runs in the cooling mode. In the figure, the photovoltaic power generation component generates insufficient power, and the mains power supply is used to supplement the power gap of the air conditioner;

[0041] Fig.10 yes Figure 2 A schematic diagram showing that the photovoltaic air conditioning system operates in comfort mode or power saving mode and the air conditioner operates in heating mode and only uses the mains power supply to power the air conditioner;

[0042] Fig.11 yes Figure 2 A power supply schematic diagram of the photovoltaic air conditioning system in the comfort mode or power saving mode and the air conditioner in the air supply mode, in which the photovoltaic power generation component has sufficient power generation to supply power to the air conditioner alone and charge the small power storage components;

[0043] Fig.12 yes Figure 2 Another power supply diagram when the photovoltaic air conditioning system in the figure is running in the comfort mode or power saving mode and the air conditioner is running in the air supply mode. In the figure, the power generation of the photovoltaic power generation component is seriously insufficient, and only the mains power supply is used to power the air conditioner;

[0044] Fig.13 yes Figure 2 Another power supply diagram of the photovoltaic air conditioning system in the power saving mode and the air conditioner in the air supply mode. In the figure, the photovoltaic power generation component generates insufficient power, and the photovoltaic power generation component is used to power the air conditioner while reducing the indoor air level.

[0045] Fig.14 yes Figure 2 Schematic diagram of control flow of photovoltaic air conditioning system in power saving mode;

[0046] Fig.15 yes Figure 2 Schematic diagram of the control flow of the photovoltaic air-conditioning system in the comfort mode.

[0047] The accompanying drawings are marked as follows:

[0048] 1. Air conditioner; 11. Compressor; 12. Indoor heat exchanger; 121. Water collection tray; 122. Indoor fan; 13. Water pump; 14. Outdoor heat exchanger; 141. Outdoor fan; 151. First throttling element; 152. Second throttling element; 16. Four-way reversing valve; 17. Liquid storage tank; 181. External machine control device; 182. Internal machine control device; 2. Photovoltaic power generation component; 21. Water washing mechanism; 211. Water collection tray; 2111. Drain outlet; 2112. Lifting sealing rod; 2113. Low point switch; 2114. High point switch; 2115. Float; 2116. Sealing head; 2117. Lifting drive component; 212. Semiconductor refrigeration component; 213. Condensate distribution tray; 2131. Drain hole; 214. Drainage control component; 3. Mains power supply; 4. Small storage component. DETAILED DESCRIPTION

[0049] 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 only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0050] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0053] See Figure 1As shown, the present invention provides a photovoltaic air-conditioning system, including an air conditioner 1 and a photovoltaic power generation component 2 and a mains power supply 3 capable of supplying power to the air conditioner 1, wherein the air conditioner 1 includes a compressor 11, an indoor heat exchanger 12, a second throttling element 152, a liquid storage tank 17, a first throttling element 151, an outdoor heat exchanger 14 and a four-way reversing valve 16, the indoor heat exchanger 12 is provided with a water receiving tray 121 located thereunder and an indoor fan 122 for driving air to exchange heat therewith, the outdoor heat exchanger 14 is provided with an outdoor fan 141 for driving air to exchange heat therewith, it can be understood that the air conditioner also includes a water pump 13, the water pump 13 is used to discharge the condensed water received in the water receiving tray 121 to the external environment or to the target location, such as the water collecting tray 211 of the photovoltaic power generation component 2, the air conditioner also includes an outdoor unit control device 181 and an indoor unit control device 182. In a preferred embodiment, the air conditioner also includes a small power storage component 4, such as a capacitor or a small battery, which acts as a buffer container and only needs to meet the power consumption requirement of the air conditioner running at full load for a few minutes (2-3 minutes). During its charging or discharging period, the size of the photovoltaic power generation power and the power consumption of the air conditioning equipment is judged to accurately identify whether the photovoltaic power generation can meet the power consumption of the air conditioning equipment.

[0054] See also Figure 1 and Fig.15 As shown, according to an embodiment of the present invention, a control method of a photovoltaic air conditioning system is provided, which is used to control the aforementioned photovoltaic air conditioning system, and comprises the following steps:

[0055] After the photovoltaic air conditioning system is turned on, the real-time power generation power Pa of the photovoltaic power generation component 2 and the power consumption power Pb of the air conditioner 1 in normal operation are obtained;

[0056] When Pa≤Pb, the air conditioner 1 is controlled to operate at reduced power, wherein the reduced power operation includes, for example, lowering the operating frequency of the compressor 11 and lowering the air conditioner wind speed.

[0057] In this technical solution, when the real-time power generation is not higher than the power consumption of the air conditioner 1 under normal operation, the air conditioner 1 is controlled to reduce the power operation and actively reduce its power consumption demand. This can reduce the power storage capacity demand of the power storage components configured in the system on the one hand, and on the other hand, it can reduce the number of photovoltaic panels configured in the photovoltaic power generation assembly 2. In addition, when the photovoltaic power generation assembly 2 generates insufficient power, it can still ensure that the air conditioner 1 can maintain operation without shutting down during the day without the need for city power supply (for example, when the city power is off), thus meeting the user's basic air conditioning needs. In addition, the photovoltaic power generation assembly 2 does not need to be equipped with too many photovoltaic panels, which can reduce the cost investment of photovoltaic panels and is conducive to the market promotion of photovoltaic air conditioning systems.

[0058] In some embodiments, when Pa≤Pb, the following steps are further included:

[0059] Compare the size of Pa and Pc, Pc photovoltaic power setting value (such as Fig.14 , and Pc<Pb, the aforementioned Pc has corresponding different preset values ​​according to different operation modes of the air conditioner 1;

[0060] When Pa<Pc, the mains power supply source 3 is controlled to supply power to the air conditioner 1, and after the mains power supply source 3 successfully supplies power to the air conditioner 1, the air conditioner 1 is controlled to operate at reduced power.

[0061] In this technical solution, when Pa<Pc, it indicates that photovoltaic power generation is seriously insufficient, and photovoltaic power generation alone cannot maintain the reduced-power operation of the air conditioner 1. Therefore, at this time, the AC power supply source 3 is further used to power the air conditioner 1. It can be understood that at this time, since the air conditioner 1 is operating at a reduced power, the AC power supply cost is objectively saved.

[0062] In some embodiments, the photovoltaic air conditioning system is equipped with a small power storage component 4 (for example Fig.14 and Fig.15 The maximum storage capacity of the small storage component 4 is equal to the power consumption of the air conditioner 1 running at maximum power for a target time (generally 2-3 minutes);

[0063] When Pa≥Pc, the small power storage component 4 and the photovoltaic power generation component 2 are controlled to supply power to the air conditioner 1 at the same time, and the air conditioner 1 is controlled to reduce the power operation. When Pa≥Pc, it means that although the power generation of the photovoltaic power generation component 2 is insufficient, it can meet the maintenance operation of the air conditioner 1 after the air conditioner 1 reduces the power. At this time, the storage capacity of the small power storage component 4 only needs to meet the possible power demand during the reduced power operation of the air conditioner 1.

[0064] In another preferred embodiment, when Pa<Pc, when the AC power supply source 3 is powered off, the small power storage component 4 and the photovoltaic power generation component 2 are controlled to supply power to the air conditioner 1 at the same time, and the air conditioner 1 is controlled to operate at reduced power. The small power storage component 4 and the photovoltaic power generation component 2 are used to supply power to the air conditioner 1 at the same time to ensure that the air conditioner 1 operates at reduced power for a longer period of time.

[0065] In some embodiments, when Pa>Pb, it means that the photovoltaic power generation component 2 has sufficient power generation capacity, and it is detected whether the small power storage component 4 is in a fully charged state. When the small power storage component 4 is not in a fully charged state, the photovoltaic power generation component 2 is controlled to charge the small power storage component 4.

[0066] When the small power storage component 4 and the photovoltaic power generation component 2 are simultaneously supplying power to the air conditioner 1, the discharge current of the small power storage component 4 is detected, and when the discharge current is 0, the AC power supply 3 is tried to be used to supply power to the air conditioner 1 at the same time to ensure that the air conditioner 1 maintains operation for as long as possible.

[0067] In some embodiments, the photovoltaic power generation component 2 is equipped with a water washing mechanism 21, which is used to clean the outer surface of the photovoltaic panel of the photovoltaic power generation component 2. During the operation of the photovoltaic air-conditioning system, when Pa>Pb, the water washing mechanism 21 is controlled to operate.

[0068] In this technical solution, the outer surface of the photovoltaic panel is cleaned by the water washing mechanism 21, which can remove dust from the surface of the photovoltaic panel and increase the power generation of the photovoltaic panel. The water washing mechanism 21 is controlled to operate only when the photovoltaic power generation component 2 generates sufficient power, to prevent the power supply time to the air conditioner 1 from being reduced when the photovoltaic power generation component 2 generates insufficient power.

[0069] In another preferred embodiment, the water washing mechanism 21 includes a water collecting tray 211, and a semiconductor refrigeration component 212 is arranged in the upper area of ​​the water collecting tray 211. The cold end of the semiconductor refrigeration component 212 is used to condense moisture in the surrounding air to form condensed water, so as to use the formed condensed water to clean the photovoltaic panel. It can be understood that the hot end of the semiconductor refrigeration component 212 is located on the outside of the water collecting tray 211.

[0070] In this technical solution, semiconductor refrigeration components 212 are used to generate condensed water, and this condensed water is used to clean the photovoltaic panels. In this way, the cooling capacity of the condensed water can be used to cool the photovoltaic panels while cleaning the photovoltaic panels, thereby improving the efficiency of photovoltaic power generation. At the same time, it should be noted that the use of semiconductor refrigeration components 212 to actively generate condensed water also makes it unnecessary to set up a corresponding water supply structure specifically for the photovoltaic power generation component 2, thereby simplifying the structural design of the photovoltaic power generation component 2. The specific number of the semiconductor refrigeration components 212 can be reasonably selected according to the specific demand for condensed water for cleaning.

[0071] In some embodiments, the water washing mechanism 21 also includes a condensate distribution tray 213, and a plurality of drain holes 2131 are provided on the bottom plate of the condensate distribution tray 213. The plurality of drain holes 2131 are arranged at intervals along the length direction of the top end of the photovoltaic power generation component 2, and the condensate distribution tray 213 is controllably connected to the water collection space of the water collection tray 211.

[0072] In this technical solution, the condensed water stored in the water collecting space of the water collecting tray 211 can be guided and sprinkled on the outer surface of the photovoltaic power generation component 2 below it through the condensed water distribution tray 213, thereby ensuring a more comprehensive cleaning of the outer surface of the photovoltaic panel of the photovoltaic power generation component 2.

[0073] In a preferred embodiment, the water collecting tray 211 and the condensed water evenly distributing tray 213 are stacked up and down and the water collecting tray 211 closes the top opening of the condensed water evenly distributing tray 213, a drain outlet 2111 is formed on the bottom plate of the water collecting tray 211, and a drain control component 214 is provided on the drain outlet 2111. The drain control component 214 can control the drain outlet 2111 to open when the condensed water level in the water collecting tray 211 reaches a high point, and control the drain outlet 2111 to be cut off when the condensed water level in the water collecting tray 211 reaches a low point.

[0074] In this technical solution, the water collecting tray 211 is stacked on the condensed water evenly distributing tray 213, and the drainage control component 214 is used to control the discharge of the condensed water in the water collecting tray 211. The condensed water can be discharged to the condensed water evenly distributing tray 213 by gravity, and the gravitational potential energy is used to provide greater cleaning power.

[0075] In some embodiments, the drainage control assembly 214 includes a lifting sealing rod 2112, on which a low point switch 2113 and a high point switch 2114 are fixedly arranged along its height from bottom to top, and a float 2115 is also mounted on the lifting sealing rod 2112, and the float 2115 is located between the low point switch 2113 and the high point switch 2114. The lower end of the lifting sealing rod 2112 is provided with a sealing head 2116, and also includes a lifting drive component 2117, which can control the lifting sealing rod 2112 to rise when the float 2115 contacts the high point switch 2114 so that the sealing head 2116 is connected to the drain port 2111. When the float 2115 contacts the low point switch 2113, the lifting sealing rod 2112 is controlled to descend so that the sealing head 2116 cuts off the drain outlet 2111. The sealing head 2116 can be a rubber pad, for example. Preferably, the lifting drive component 2117 is an electric drive component, for example, it can be a stator assembly with an energized coil. Correspondingly, the lifting sealing rod 2112 has a corresponding permanent magnet, so that the electromagnetic force of the energized coil can be used to drive the lifting sealing rod 2112 to rotate and lift a preset height, thereby realizing the on-off control of the drain outlet 2111 by the sealing head 2116. The high point switch 2114 and the low point switch 2113 can be specifically made of commercially available contact switches.

[0076] In this technical solution, the drainage control component 214 can control the opening and closing of the drainage outlet 2111 by raising and lowering it, and control the liquid level of the condensed water by relying on the low point switch 2113 and the high point switch 2114, thereby ensuring that the amount of condensed water is sufficient for a single cleaning of the photovoltaic panel.

[0077] In another preferred embodiment, the air conditioner 1 also includes a water receiving pan 121 and a water pump 13 for receiving condensation generated by the indoor heat exchanger 12 thereof. The water pump 13 can pump the condensation water in the water receiving pan 121 into the water collecting pan 211. In this way, on the one hand, the condensation water in the water receiving pan 121 can be discharged in time to prevent overflow to the indoor side, and on the other hand, this part of the condensation water can be used to clean the photovoltaic panels.

[0078] In some embodiments, when Pa>Pb, it indicates that the photovoltaic power generation component 2 has sufficient power generation. At this time, the photovoltaic power generation component 2 is controlled to supply power to the semiconductor refrigeration component 212 and the lifting drive component 2117 to ensure the operation of the semiconductor refrigeration component 212 and the lifting drive component 2117, so as to be able to clean the photovoltaic panel in time and ensure the power generation efficiency. When Pa≤Pb, the semiconductor refrigeration component 212 and the lifting drive component 2117 are not supplied to reduce the consumption of photovoltaic power generation and ensure the operation of the air conditioner 1; or, when the air conditioner 1 is running in the cooling mode, the water pump 13 is controlled to be powered to ensure the operation of the water pump 13, that is, when the air conditioner 1 is running in the cooling mode, the water pump 13 is controlled to operate and the condensed water in the water receiving tray 121 is discharged in time.

[0079] In some embodiments, when the photovoltaic power generation component 2 supplies power to the semiconductor refrigeration component 212, when the air temperature of the environment in which the semiconductor refrigeration component 212 is located is not lower than a preset temperature value, the semiconductor refrigeration component 212 is controlled to operate to prevent the condensed water generated by the low ambient temperature from freezing.

[0080] In some embodiments, controlling the air conditioner 1 to operate at reduced power includes: when the operating mode of the air conditioner 1 is the cooling mode, controlling the compressor 11 of the air conditioner 1 to operate at a first time interval (such as Fig.14 The C value in the first frequency is reduced (such as Fig.14 or, when the operation mode of the air conditioner 1 is the heating mode, the compressor 11 of the air conditioner 1 is controlled to rotate every second time (such as Fig.14 The D value in the second frequency is reduced (such as Fig.14 or, when the operation mode of the air conditioner 1 is the air supply mode, controlling the wind speed of the indoor fan 122 of the air conditioner 1 to be lowered.

[0081] In some embodiments, the photovoltaic air-conditioning system has a power-saving mode and a comfort mode. When the photovoltaic air-conditioning system runs in the comfort mode, before obtaining Pa and Pb, it is first determined whether the AC power supply 3 is powered off. If the AC power supply 3 is powered off, the photovoltaic air-conditioning system is controlled to switch from the comfort mode to the power-saving mode, so that the air conditioner 1 can operate at a reduced power, and then the power generation of the photovoltaic power generation component 2 can maintain the operation of the air conditioner 1 for a longer period of time; if the AC power supply 3 is powered normally, the relationship between Pa and Pb is further determined, and when Pa>Pb, the photovoltaic power generation component 2 is used to power the air conditioner 1; when Pa≤Pb, the photovoltaic power generation component 2 and the AC power supply 3 are used to power the air conditioner 1 at the same time to meet the user's usage needs.

[0082] See Figure 5 As shown in the figure, the photovoltaic air conditioning system operates in power saving mode and the air conditioner operates in cooling mode. The photovoltaic power generation components and small power storage components in the figure simultaneously supply power to the air conditioner. Figure 6 The small power storage component is discharged. When the power generation of the photovoltaic power generation component 2 is insufficient, the air conditioner 1 in the figure is operated at reduced power. Therefore, the air conditioner 1 only operates under the power generation of the photovoltaic power generation component 2. In this way, when the city power is cut off, the air conditioner 1 can be guaranteed to operate without stopping, which meets the user's needs to a certain extent. The capacity of the small power storage component 4 does not need to be configured too large, which reduces the configuration cost. Since it is in power saving mode, Figure 5 and Figure 6 The semiconductor refrigeration component 212 and the lifting drive component 2117 are not powered, but because it is in cooling mode, the water pump 13 is powered to ensure the timely discharge of condensed water.

[0083] Referring to the figure, when the air conditioner 1 is in the cooling mode, the low-pressure and low-temperature refrigerant is sucked from the air intake port of the compressor 11, compressed by the compressor 11 into a high-temperature and high-pressure vapor refrigerant and discharged from the exhaust port, flows through the outdoor heat exchanger 14 through the four-way reversing valve 16 for condensation and heat exchange, and is cooled into a high-pressure and medium-temperature refrigerant. The refrigerant flows to the first throttling element 151 and changes into a low-temperature and low-pressure vapor-liquid two-phase state, and then is split in the liquid storage tank 17, wherein the vapor refrigerant is at the upper end of the liquid storage tank 17 and is directly sucked into the air supply port of the compressor 11. The other liquid refrigerant is discharged from the bottom of the liquid storage tank 17 and throttled again by the second throttling element 152, and the pressure and temperature of the refrigerant are further reduced, and then flows through the indoor heat exchanger 12 to absorb heat. After the refrigerant is heated, it returns to the air intake port of the compressor 11 through the four-way reversing valve 16, forming a refrigeration cycle. During this period, the indoor fan 122 and the outdoor fan 141 are always running.

[0084] Figure 7As shown, since the power generation of the photovoltaic power generation component 2 is obviously insufficient, the photovoltaic power generation component 2 and the mains power supply source 3 are used to power the air conditioner at the same time, and the water washing mechanism 21 is not powered at this time.

[0085] Fig.10 The figure shows the operation of the air conditioner 1 in the heating mode. After the low-pressure and low-temperature refrigerant is sucked from the air intake port of the compressor 11, it is compressed by the compressor 11 into a high-temperature and high-pressure vapor refrigerant and discharged from the exhaust port. It flows through the indoor heat exchanger 12 through the four-way reversing valve 16 for condensation and heat exchange, and is cooled into a high-pressure and medium-temperature refrigerant. The refrigerant flows to the second throttling element 152 and changes into a low-temperature and low-pressure vapor-liquid two-phase state, and then is split in the liquid storage tank 17, wherein the vapor refrigerant is at the upper end of the liquid storage tank 17 and is directly sucked into the air supply port of the compressor 11. The other liquid refrigerant is discharged from the bottom of the liquid storage tank 17 and throttled again by the first throttling element 151. The pressure and temperature of the refrigerant further decrease, and then it flows through the outdoor heat exchanger 14 to absorb heat. After the refrigerant is heated, it returns to the air intake port of the compressor 11 through the four-way reversing valve 16, forming a heating cycle. During this period, the indoor fan 122 and the outdoor fan 141 are always running.

[0086] Figures 11 to 13 It shows the situation that the air conditioner 1 is running in the air supply mode, at this time, only the indoor fan 122 in the air conditioner 1 is running, and the compressor 11 is not running.

[0087] Fig.14 and Fig.15 In a specific embodiment, the A value, B value, C value, D value, E value, F value, G value, and H value are respectively A=7~12°C; B=3~6Hz; C=0.5~1min; D=0.5~1min; E=100~300W (in cooling mode); E=80~300W (in heating mode); E=30~150W (in air supply mode); F=4~8Hz; G=5~8Hz; H=4~8Hz.

[0088] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A control method for a photovoltaic air conditioning system, the photovoltaic air conditioning system comprising an air conditioner (1) and a photovoltaic power generation component (2) and a mains power supply (3) capable of supplying power to the air conditioner (1), characterized in that: The steps include: After the photovoltaic air conditioning system is instructed to start, the real-time power generation power Pa of the photovoltaic power generation component (2) and the power consumption power Pb of the air conditioner (1) in a normal operating state are obtained; When Pa≤Pb, the air conditioner (1) is controlled to operate at reduced power.

2. The control method according to claim 1, characterized in that: When Pa≤Pb, the following steps are also included: Compare the size of Pa and Pc, Pc is the set value of photovoltaic power generation, and Pc<Pb; When Pa<Pc, the mains power supply (3) is controlled to supply power to the air conditioner (1), and after the mains power supply (3) successfully supplies power to the air conditioner (1), the air conditioner (1) is controlled to operate at reduced power.

3. The control method according to claim 2, characterized in that: The photovoltaic air conditioning system is equipped with a small power storage component (4), the maximum power storage capacity of the small power storage component (4) being equal to the power consumption of the air conditioner (1) when operating at maximum power for a target time period; When Pa≥Pc, the small power storage component (4) and the photovoltaic power generation component (2) are controlled to supply power to the air conditioner (1) at the same time, and the air conditioner (1) is controlled to operate at a reduced power; or, When Pa<Pc, when the mains power supply (3) is powered off, the small power storage component (4) and the photovoltaic power generation component (2) are controlled to supply power to the air conditioner (1) at the same time, and the air conditioner (1) is controlled to operate at a reduced power.

4. The control method according to claim 3, characterized in that: When Pa>Pb, detecting whether the small power storage component (4) is in a fully charged state, and when the small power storage component (4) is not in a fully charged state, controlling the photovoltaic power generation component (2) to charge the small power storage component (4); or, In the process of the small power storage component (4) and the photovoltaic power generation assembly (2) simultaneously supplying power to the air conditioner (1), the discharge current of the small power storage component (4) is detected, and when the discharge current is 0, the mains power supply (3) is attempted to be used simultaneously to supply power to the air conditioner (1).

5. The control method according to claim 1, characterized in that: The photovoltaic power generation component (2) is provided with a water washing mechanism (21), and the water washing mechanism (21) is used to clean the outer surface of the photovoltaic panel of the photovoltaic power generation component (2). When Pa>Pb is in operation during the start-up of the photovoltaic air conditioning system, the water washing mechanism (21) is controlled to operate.

6. The control method according to claim 5, characterized in that: The water washing mechanism (21) comprises a water collecting tray (211), and a semiconductor refrigeration element (212) is arranged in the upper area of ​​the water collecting tray (211). The cold end of the semiconductor refrigeration element (212) is used to condense moisture in the surrounding air to form condensed water, so as to use the formed condensed water to clean the photovoltaic panel.

7. The control method according to claim 6, characterized in that: The water washing mechanism (21) further comprises a condensed water distribution plate (213), a bottom plate of which is provided with a plurality of water drop holes (2131). The plurality of water drop holes (2131) are arranged at intervals along the length direction of the top end of the photovoltaic power generation component (2), and the condensed water distribution plate (213) is controllably connected to the water collection space of the water collection plate (211).

8. The control method according to claim 7, characterized in that: The water collecting tray (211) and the condensed water evenly distributing tray (213) are stacked up and down, and the water collecting tray (211) closes the top opening of the condensed water evenly distributing tray (213). A drainage outlet (2111) is formed on the bottom plate of the water collecting tray (211), and a drainage control component (214) is arranged on the drainage outlet (2111). The drainage control component (214) can control the drainage outlet (2111) to open when the condensed water level in the water collecting tray (211) reaches a high point, and control the drainage outlet (2111) to be cut off when the condensed water level in the water collecting tray (211) reaches a low point.

9. The control method according to claim 8, characterized in that: The drainage control assembly (214) comprises a lifting sealing rod (2112), on which a low point switch (2113) and a high point switch (2114) are fixedly arranged and arranged at intervals from bottom to top along the height of the lifting sealing rod (2112), and a float (2115) is also mounted on the lifting sealing rod (2112), and the float (2115) is located between the low point switch (2113) and the high point switch (2114), and a sealing member is provided at the lower end of the lifting sealing rod (2112). The head (2116) also includes a lifting drive component (2117), which is capable of controlling the lifting sealing rod (2112) to rise when the float (2115) contacts the high point switch (2114) so ​​that the sealing head (2116) is connected to the drain outlet (2111), and controlling the lifting sealing rod (2112) to descend when the float (2115) contacts the low point switch (2113) so that the sealing head (2116) cuts off the drain outlet (2111).

10. The control method according to claim 9, characterized in that: The air conditioner (1) further comprises a water receiving pan (121) for receiving condensation generated by the indoor heat exchanger (12) and a water pump (13), wherein the water pump (13) is capable of pumping condensation water in the water receiving pan (121) into the water collecting pan (211); and / or the lifting drive component (2117) is an electric drive component.

11. The control method according to claim 10, characterized in that: When Pa>Pb, the photovoltaic power generation component (2) is controlled to supply power to the semiconductor refrigeration component (212) and the lifting drive component (2117) to ensure the operation of the semiconductor refrigeration component (212) and the lifting drive component (2117).

12. The control method according to claim 11, characterized in that: In a state where the photovoltaic power generation component (2) supplies power to the semiconductor refrigeration component (212), when the air temperature of the environment in which the semiconductor refrigeration component (212) is located is not lower than a preset temperature value, the semiconductor refrigeration component (212) is controlled to operate.

13. The control method according to claim 1, characterized in that: Controlling the air conditioner (1) to operate at reduced power includes: When the operation mode of the air conditioner (1) is a cooling mode, controlling the compressor (11) of the air conditioner (1) to reduce a first frequency at first intervals; or, When the operation mode of the air conditioner (1) is a heating mode, controlling the compressor (11) of the air conditioner (1) to reduce the second frequency every second time; or, When the operation mode of the air conditioner (1) is the air supply mode, the wind speed of the indoor fan (122) of the air conditioner (1) is controlled to be lowered.

14. The control method according to claim 1, characterized in that: The photovoltaic air conditioning system has a power saving mode and a comfort mode. When the photovoltaic air conditioning system operates in the comfort mode, before obtaining Pa and Pb, it is first determined whether the mains power supply (3) is powered off. If the mains power supply (3) is powered off, the photovoltaic air conditioning system is controlled to switch from the comfort mode to the power saving mode. If the mains power supply (3) is powered normally, the relationship between Pa and Pb is further determined, and when Pa>Pb, the photovoltaic power generation component (2) is used to power the air conditioner (1); when Pa≤Pb, the photovoltaic power generation component (2) and the mains power supply (3) are used to power the air conditioner (1) at the same time.

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