Dual-system air conditioner and control method and control device thereof

Abstract

The invention provides a dual-system air conditioner and a control method and device thereof. The dual-system air conditioner comprises a main air conditioning system and a main system power module, wherein the main air conditioning system comprises a main refrigerant loop and a main system power module; the secondary air conditioning system comprises a secondary refrigerant loop, a refrigerant radiator is connected between the evaporator and the condenser in series, and the refrigerant radiator is in heat transfer connection with the main system power module; the control device comprises an acquisition module and a control module, and the acquisition module is used for acquiring the temperature of the main system power module; and the control module is used for controlling and adjusting working parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module. The temperature of the refrigerant radiator can be reduced through the medium-temperature and high-pressure refrigerant behind the condenser of the secondary air-conditioning system so as to reduce the temperature of the power module, the supercooling degree of the refrigerant of the condenser of the main air-conditioning system is not reduced, the condensation phenomenon is not likely to occur, and the safety, reliability and the refrigerating and heating effects are guaranteed. And the two systems operate independently, so that the control is more flexible.

Description

Technical Field

[0001] The present invention relates to the field of electrical equipment technology, and in particular to a dual-system air conditioner and a control method and a control device thereof. Background Art

[0002] At present, many air conditioners, especially large air conditioners, are basically variable frequency compressors, and variable frequency compressors require variable frequency power modules to drive the frequency conversion. During the operation of the unit, the power module will generate a higher temperature. At present, most of them are closely contacted with the refrigerant radiator and the power module. The refrigerant in the system flows through the refrigerant radiator to reduce the temperature of the power module and prevent the power module from running at high temperature, thereby increasing the service life of the power module and reducing the defective rate of the power module. In addition, if the temperature of the power module is too high, the compressor will automatically reduce the frequency, seriously affecting the cooling and heating effects.

[0003] There are basically two ways in the existing system. One is to reduce the refrigerant heat dissipation temperature through the refrigerant condensed on the high-pressure side of the system. However, this method will cause the original system to reduce the degree of supercooling before entering the evaporator, affecting the cooling and heating effect of the air conditioner. Another way is to separate the medium-temperature and high-pressure liquid refrigerant after condensation into a low-temperature and low-pressure refrigerant gas-liquid mixture through the throttling and pressure reduction of the electronic expansion valve, thereby absorbing the temperature of the refrigerant heat dissipation. However, this method has two disadvantages. First, the diversion leads to a reduction in the circulation of the refrigerant, resulting in a worse cooling and heating effect of the indoor mechanism. Second, the electronic expansion valve throttling and pressure reduction of the refrigerant gas-liquid mixture at a low temperature and low pressure is often at a lower temperature. The high humidity operating environment often causes condensation on the power module and computer board through the cold bridge effect, which reduces safety and reliability. Summary of the invention

[0004] The present invention provides a dual-system air conditioner and a control method and control device thereof, which are used to solve the defects existing in the prior art and achieve the following technical effects: the temperature of the refrigerant radiator can be reduced to reduce the temperature of the power module through the medium-temperature and high-pressure refrigerant after the condenser of the secondary air conditioning system, without reducing the supercooling degree of the condenser refrigerant of the main air conditioning system, and condensation is not easy to occur, and the safety, reliability and cooling and heating effects are guaranteed. Moreover, the two systems operate independently of each other, and the control is more flexible.

[0005] A dual-system air conditioner according to a first embodiment of the present invention comprises: A main air conditioning system, including a main refrigerant circuit and a main system power module, wherein the main refrigerant circuit includes an outdoor heat exchanger, an indoor heat exchanger and a main compressor; A secondary air conditioning system, comprising a secondary refrigerant circuit, the secondary refrigerant circuit comprising an evaporator, a condenser and a secondary compressor, a refrigerant radiator is connected in series between the evaporator and the condenser, and the refrigerant radiator is heat-transferably connected to the main system power module; The control device includes an acquisition module and a control module, wherein the acquisition module is used to acquire the temperature of the main system power module; the control module is used to control and adjust the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module.

[0006] According to a second embodiment of the present invention, a control method for a dual-system air conditioner based on the first embodiment of the present invention includes: Acquiring the temperature of the main system power module; The operating parameters of the main air-conditioning system and / or the secondary air-conditioning system are controlled and adjusted according to the temperature of the main system power module.

[0007] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module specifically includes: According to the temperature range of the power module of the main system, the on / off status of the secondary compressor is controlled, and the target condensing pressure of the secondary air-conditioning system is determined; When the secondary compressor is turned on, the operating frequency of the secondary compressor is controlled and adjusted according to the target condensing pressure until the actual condensing pressure of the secondary air-conditioning system reaches the target condensing pressure.

[0008] According to an embodiment of the present invention, the step of controlling the on / off status of the secondary compressor and determining the target condensing pressure of the secondary air-conditioning system according to the temperature range of the power module of the main system specifically includes: When the temperature of the main system power module is greater than or equal to the first set temperature, controlling the secondary compressor to start, and determining the target condensing pressure to be the first condensing pressure; When the temperature of the main system power module is greater than or equal to the second set temperature and less than the third set temperature, determining the target condensing pressure to be the second condensing pressure, and the secondary compressor is running at this time; When the temperature of the main system power module is greater than or equal to the third set temperature and less than the fourth set temperature, determining the target condensing pressure to be the third condensing pressure, at which time the secondary compressor is running; When the temperature of the main system power module is greater than or equal to a fourth set temperature, determining the target condensing pressure to be a fourth condensing pressure, and at this time the secondary compressor operates at a set maximum frequency; The second set temperature is greater than the first set temperature, the first condensing pressure is less than the second condensing pressure, the second condensing pressure is less than the third condensing pressure, and the third condensing pressure is less than the fourth condensing pressure.

[0009] According to one embodiment of the present invention, when the secondary compressor is turned on, in the step of controlling and adjusting the operating frequency of the secondary compressor according to the target condensing pressure until the actual condensing pressure of the secondary air-conditioning system reaches the target condensing pressure: When the target condensing pressure is the first condensing pressure, controlling the operating frequency of the secondary compressor to not exceed a first percentage of a set maximum frequency; When the target condensing pressure is the second condensing pressure, controlling the operating frequency of the secondary compressor to not exceed a second percentage of the set maximum frequency; When the target condensing pressure is a third condensing pressure, controlling the operating frequency of the secondary compressor to not exceed a third percentage of a set maximum frequency; The first percentage is smaller than the second percentage, and the second percentage is smaller than the third percentage.

[0010] According to an embodiment of the present invention, the step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module specifically includes: Determining that the operating frequency of the secondary compressor reaches a set maximum frequency and the temperature of the main system power module is greater than or equal to a fourth set temperature; The operating frequency of the main compressor is controlled and adjusted according to the temperature range of the main system power module.

[0011] According to an embodiment of the present invention, the step of controlling and adjusting the operating frequency of the main compressor according to the temperature range of the main system power module specifically includes: When the temperature of the main system power module is greater than or equal to a fourth set temperature and less than a fifth set temperature, controlling the main compressor to reduce the frequency to a first set ratio of the original operating frequency at a first frequency reduction speed; When the temperature of the main system power module is greater than or equal to the fifth set temperature and less than the sixth set temperature, the main compressor is controlled to reduce the frequency to a second set ratio of the original operating frequency at a second frequency reduction speed; When the temperature of the main system power module is greater than or equal to the sixth set temperature and less than the seventh set temperature, controlling the main compressor to reduce the frequency to a third set ratio of the original operating frequency at a third frequency reduction speed; When the temperature of the main system power module is greater than or equal to the seventh set temperature and less than the eighth set temperature, controlling the main compressor to reduce the frequency to a fourth set ratio of the original operating frequency at a fourth frequency reduction speed; When the temperature of the main system power module is greater than or equal to an eighth set temperature, controlling the main compressor to stop; Among them, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the third frequency reduction speed is less than the fourth frequency reduction speed, and the first setting ratio is greater than the second setting ratio, the second setting ratio is greater than the third setting ratio, and the third setting ratio is greater than the fourth setting ratio.

[0012] According to one embodiment of the present invention, the control method of the dual-system air conditioner further includes: Obtaining the condenser outlet temperature of the secondary air conditioning system; The operating parameters of the external fan of the secondary air-conditioning system are controlled and adjusted according to the outlet temperature of the condenser and the temperature of the power module of the main system.

[0013] According to an embodiment of the present invention, controlling and adjusting the operating parameters of the external fan of the secondary air conditioning system according to the condenser outlet temperature and the temperature of the main system power module specifically includes: When the difference between the temperature of the main system power module and the condenser outlet temperature is less than a first set difference, controlling the external fan of the secondary air-conditioning system to maintain the set highest gear operation; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to the first set difference and less than the second set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the first upshift speed and the maximum gear does not exceed the first set gear; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to the second set difference and less than the third set difference, the external fan of the secondary air-conditioning system is controlled to maintain the current gear and not exceed the second set gear at most; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to the third set difference and less than the fourth set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the second upshift speed and the maximum gear does not exceed the third set gear; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to a fourth set difference, controlling the external fan of the secondary air-conditioning system to increase the gear according to the third upshift speed and not exceeding the fourth set gear at most; Among them, the first upshift speed is greater than the second upshift speed, the second upshift speed is greater than the third upshift speed, and the first set gear is greater than the second set gear, the second set gear is greater than the third set gear, and the third set gear is greater than the fourth set gear.

[0014] According to a third aspect of the present invention, a control device for a dual-system air conditioner based on the first aspect of the present invention comprises: An acquisition module, used for acquiring the temperature of the main system power module; The control module is used to control and adjust the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module.

[0015] The present invention aims to provide a dual-system air conditioner and a control method and control device thereof, wherein a secondary system is inserted into the main system, and the secondary air conditioning system includes a secondary compressor, a condenser, an evaporator, a throttling device, and a refrigerant radiator. The refrigerant radiator temperature can be lowered by the medium-temperature and high-pressure refrigerant behind the condenser of the secondary air conditioning system to lower the temperature of the power module, without reducing the supercooling degree of the condenser refrigerant of the main air conditioning system, and condensation is not easy to occur, so that safety, reliability, and cooling and heating effects are guaranteed. Moreover, the two systems operate independently of each other, and the control is more flexible.

[0016] Furthermore, compared with the related art, the present invention has the following advantages.

[0017] (1) Independence and flexibility: The main air-conditioning system and the secondary air-conditioning system can operate independently without interfering with each other, which makes the control more flexible. Any system can be adjusted separately according to the actual situation without affecting the normal operation of the other system.

[0018] (2) Power module temperature control: The secondary air-conditioning system is specifically used to control the temperature of the power module of the main air-conditioning system. The temperature of the power module of the main system is lowered by the medium-temperature and high-pressure refrigerant condensed by the secondary system. This can effectively prevent the power module from overheating and causing the compressor to reduce its frequency, thereby ensuring the cooling and heating effects of the air-conditioning system.

[0019] (3) Refrigerant subcooling maintenance: The traditional method of reducing the refrigerant heat dissipation temperature by condensing the refrigerant on the high-pressure side will cause the main system's subcooling to decrease, thereby affecting the overall performance of the air conditioner. The present invention achieves power module cooling through the independent operation of the secondary system, avoiding this situation, thereby ensuring that the cooling and heating efficiency of the main system is not affected.

[0020] (4) Avoid condensation: In high humidity environments, the traditional electronic expansion valve throttling and pressure reduction method easily causes condensation on the power module and computer board, reducing the safety and reliability of the system. The refrigerant heat dissipation method adopted by the present invention will not cause the temperature to be too low, thereby reducing the risk of condensation.

[0021] (5) Intelligent control: The present invention uses intelligent control methods to adjust the parameters of the secondary system, such as the compressor frequency, valve opening, and fan speed, and realizes intelligent adjustment of the operating state of the secondary system according to the temperature change of the power module of the main system, thereby ensuring the stability and efficiency of the system.

[0022] As described above, the present invention not only solves the problem of overheating of the power module, but also optimizes the overall performance of the system and improves the safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the dual-system air conditioner provided by the present invention.

[0025] Figure 2 It is a flow chart of the control method of the dual-system air conditioner provided by the present invention.

[0026] Figure 3 It is a structural schematic diagram of the control device of the dual-system air conditioner provided by the present invention.

[0027] Figure 4 It is a structural schematic diagram of the electronic device provided by the present invention. Description of the drawings: 1. Main refrigerant circuit; 11. Main system power module; 12. Outdoor heat exchanger; 13. Indoor heat exchanger; 14. Main compressor; 15. Four-way valve; 2. Secondary refrigerant circuit; 21. Evaporator; 22. Condenser; 23. Secondary compressor; 24. Refrigerant radiator; 25. Throttling device; 110. Acquisition module; 120. Control module. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] A dual-system air conditioner and a control method and a control device thereof provided by the present invention will be described below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, the dual-system air conditioner according to the first embodiment of the present invention includes a main air conditioning system, a secondary air conditioning system and a control device.

[0033] The main air conditioning system includes a main refrigerant circuit 1 and a main system power module 11 . The main refrigerant circuit includes an outdoor heat exchanger 12 , an indoor heat exchanger 13 and a main compressor 14 .

[0034] The secondary air-conditioning system includes a secondary refrigerant circuit 2, which includes an evaporator 21, a condenser 22 and a secondary compressor 23. A refrigerant radiator 24 is connected in series between the evaporator 21 and the condenser 22, and the refrigerant radiator 24 is heat-transferably connected to the main system power module 11.

[0035] The control device includes an acquisition module 110 and a control module 120. The acquisition module 110 is used to acquire the temperature of the main system power module 11; the control module 120 is used to control and adjust the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11.

[0036] As for the dual-system air conditioner of the embodiment of the present invention, the structural composition and effectiveness of each system inside it are introduced in turn below.

[0037] The main air conditioning system includes a main refrigerant circuit 1 and a main system power module 11. The main refrigerant circuit 1 consists of an outdoor heat exchanger 12 (condenser 22), an indoor heat exchanger 13 (evaporator 21) and a main compressor 14. The main compressor 14 is responsible for compressing the refrigerant into a high-temperature and high-pressure gas, and then releasing heat to the external environment through the outdoor heat exchanger 12, so that the refrigerant becomes a medium-temperature and high-pressure liquid. Subsequently, the refrigerant passes through a throttling device 25 (not specifically mentioned, but usually present) and becomes a low-temperature and low-pressure liquid or a gas-liquid mixed state, and finally absorbs indoor heat through the indoor heat exchanger 13, and is converted into a low-temperature and low-pressure gas and returns to the compressor, completing a cycle. The main system power module 11 is used to drive the variable frequency operation of the main compressor 14, which generates heat due to its work.

[0038] The secondary air conditioning system includes a secondary refrigerant circuit 2, which is composed of an evaporator 21, a condenser 22 and a secondary compressor 23. Among them, a refrigerant radiator 24 is connected in series between the evaporator 21 and the condenser 22. The function of the refrigerant radiator 24 is to exchange heat with the main system power module 11 through heat transfer, thereby reducing the temperature of the power module. The secondary compressor 23 is responsible for compressing the refrigerant to make it a high-temperature and high-pressure gas, and then releases heat to the external environment through the condenser 22, so that the refrigerant becomes a medium-temperature and high-pressure liquid. After that, the refrigerant exchanges heat with the main system power module 11 through the refrigerant radiator 24, absorbs the heat of the power module, and thus reduces the temperature of the power module. After that, the refrigerant continues to throttle and reduce the pressure through the throttling device 25, and then returns to the compressor after absorbing heat through the evaporator 21.

[0039] The control device includes an acquisition module 110 and a control module 120. The acquisition module is responsible for monitoring the temperature of the main system power module 11. The control module 110 determines how to adjust the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system based on the obtained temperature data to ensure that the temperature of the power module is within a safe range. When it is detected that the temperature of the main system power module 11 is too high, the control module 110 will take measures to increase the cooling capacity of the secondary air-conditioning system, such as increasing the frequency of the secondary compressor 23 or adjusting the opening of the throttling device 25, thereby indirectly reducing the temperature of the main system power module 11.

[0040] Further, based on the above structure, the specific working principle and working process of the dual-system air conditioner of the present invention are introduced as follows: when the air conditioning system is started, if it is detected that the temperature of the main system power module 11 exceeds the preset safety threshold, the secondary air conditioning system starts to work, compresses the refrigerant through the secondary compressor 23, and cools the refrigerant to a medium-temperature and high-pressure state through the condenser 22 and the refrigerant radiator 24 of the secondary refrigerant circuit 2, and then performs heat exchange with the main system power module 11 through the refrigerant radiator 24, thereby reducing the temperature of the main system power module 11. During this process, the control device will dynamically adjust the working parameters of the secondary air conditioning system according to the actual temperature changes to achieve the best cooling effect. When the temperature of the main system power module 11 drops to a safe range, the secondary air conditioning system may reduce its working intensity or stop working. This design enables the air conditioning system to effectively manage the temperature of the power module while maintaining the cooling and heating effects, avoiding the problem of system frequency reduction or shutdown due to overheating.

[0041] In summary, the present invention aims to provide a dual-system air conditioner, by inserting a secondary system into the main system, the secondary air conditioning system includes a secondary compressor 23, a condenser 22, an evaporator 21, a throttling device 25, and a refrigerant radiator 24, which can reduce the temperature of the refrigerant radiator 24 to reduce the temperature of the power module through the medium-temperature and high-pressure refrigerant after the condenser 22 of the secondary air conditioning system, and does not reduce the supercooling degree of the refrigerant in the condenser 22 of the main air conditioning system, and is not prone to condensation, and safety, reliability, and cooling and heating effects are guaranteed. Moreover, the two systems operate independently of each other, and the control is more flexible.

[0042] Furthermore, compared with the related art, the present invention has the following advantages.

[0043] (1) Independence and flexibility: The main air-conditioning system and the secondary air-conditioning system can operate independently without interfering with each other, which makes the control more flexible. Any system can be adjusted separately according to the actual situation without affecting the normal operation of the other system.

[0044] (2) Power module temperature control: The secondary air-conditioning system is specifically used to control the temperature of the power module of the main air-conditioning system. The temperature of the power module 11 of the main system is lowered by the medium-temperature and high-pressure refrigerant condensed by the secondary system. This can effectively prevent the power module from overheating and causing the compressor to reduce its frequency, thereby ensuring the cooling and heating effects of the air-conditioning system.

[0045] (3) Refrigerant subcooling maintenance: The traditional method of reducing the refrigerant heat dissipation temperature by condensing the refrigerant on the high-pressure side will cause the main system's subcooling to decrease, thereby affecting the overall performance of the air conditioner. The present invention achieves power module cooling through the independent operation of the secondary system, avoiding this situation, thereby ensuring that the cooling and heating efficiency of the main system is not affected.

[0046] (4) Avoid condensation: In high humidity environments, the traditional electronic expansion valve throttling and pressure reduction method easily causes condensation on the power module and computer board, reducing the safety and reliability of the system. The refrigerant heat dissipation method adopted by the present invention will not cause the temperature to be too low, thereby reducing the risk of condensation.

[0047] (5) Intelligent control: The present invention uses intelligent control methods to adjust the parameters of the secondary system, such as the compressor frequency, valve opening, and fan speed, and realizes intelligent adjustment of the operating state of the secondary system according to the temperature change of the main system power module 11, thereby ensuring the stability and efficiency of the system.

[0048] As described above, the present invention not only solves the problem of overheating of the power module, but also optimizes the overall performance of the system and improves the safety and reliability of the system.

[0049] The control method, control device and dual-system air conditioner of the dual-system air conditioner proposed in the present invention are described below with reference to the accompanying drawings. Among them, before the embodiment of the present invention is described in detail, the entire application scenario is first described. The control method, control device, electronic device and computer-readable storage medium of the dual-system air conditioner of the embodiment of the present invention can be applied to the dual-system air conditioner locally, and can also be applied to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, the third-party device may include many different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0050] The following is an explanation of the control method applicable to a dual-system air conditioner as an example. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and third-party equipment.

[0051] like Figure 2 As shown, a control method for a dual-system air conditioner according to a second aspect of an embodiment of the present invention includes: Step S1, obtaining the temperature of the main system power module 11; Step S2 , controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11 .

[0052] According to the control method of the dual-system air conditioner of the embodiment of the present invention, its specific working process is as follows: in step S1, the real-time temperature data of the power module in the main air-conditioning system is obtained by a sensor or other monitoring means. In step S2, the operating status of the main air-conditioning system and the secondary air-conditioning system is adjusted according to the temperature data obtained in step S1. Specifically, when it is detected that the temperature of the power module is high, the control system will take measures to increase the cooling capacity of the secondary air-conditioning system, such as increasing the frequency of the secondary compressor 23, adjusting the opening of the electronic expansion valve or changing the speed of the fan, etc., so as to reduce the temperature of the main system power module 11 through the refrigerant radiator 24 of the secondary air-conditioning system. On the contrary, if the temperature is reduced to a safe range, the activity intensity of the secondary air-conditioning system may be reduced or the operation of the secondary air-conditioning system may be completely stopped to save energy and avoid unnecessary energy consumption.

[0053] In this way, the system can effectively manage the temperature of the power module while maintaining the cooling or heating effect of the air-conditioning system, avoiding compressor frequency reduction or shutdown problems caused by overheating, thereby improving the operating efficiency and stability of the air-conditioning system. At the same time, such a design also helps to reduce condensation in the air-conditioning system in a high humidity environment and improve the safety and reliability of the system.

[0054] According to some embodiments of the present invention, the step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11 specifically includes: According to the temperature range of the main system power module 11, the on / off status of the secondary compressor 23 is controlled, and the target condensing pressure of the secondary air-conditioning system is determined; When the secondary compressor 23 is turned on, the operating frequency of the secondary compressor 23 is controlled and adjusted according to the target condensing pressure until the actual condensing pressure of the secondary air-conditioning system reaches the target condensing pressure.

[0055] In this embodiment, when the temperature of the power module 11 of the main system is lower than a certain value (such as 43°C), the secondary compressor 23 does not need to run, and the secondary air-conditioning system does not work at this time. As the temperature rises, when the power module temperature reaches a specific range (such as 50°C and above), the secondary compressor 23 will start and set different target condensing pressures according to different temperature ranges. For example, when the temperature is between 50°C and 75°C, the target condensing pressure will be gradually adjusted as the temperature rises to ensure that the secondary air-conditioning system can effectively reduce the power module temperature of the main system. In higher temperature ranges (such as 90°C and above), the target condensing pressure of the secondary air-conditioning system will be further lowered, and the secondary compressor 23 will run at the highest frequency to quickly reduce the power module temperature, and may be accompanied by an increase in the operating speed of the outdoor fan.

[0056] When the secondary compressor 23 is started, the control system will adjust the operating frequency of the secondary compressor 23 according to the set target condensing pressure. If the actual condensing pressure fails to reach the target value, the compressor frequency will continue to rise until the actual condensing pressure is consistent with the target. Once the target condensing pressure is reached, the compressor frequency will tend to stabilize. If the actual condensing pressure exceeds the target value, the compressor frequency will be reduced to prevent the condensing pressure from being too high.

[0057] This control method ensures that the secondary air-conditioning system can effectively respond to the temperature change of the power module 11 of the main system, and realizes fine control of the temperature of the power module by dynamically adjusting the frequency of the secondary compressor 23.

[0058] In this way, through the above method, the control method of the present invention can ensure that even in extreme cases, the power module temperature of the main air-conditioning system can be effectively controlled by the secondary air-conditioning system, thereby avoiding system performance degradation due to overheating, while reducing energy consumption and maintenance costs.

[0059] In some specific embodiments of the present invention, according to the temperature range of the main system power module 11, the step of controlling the on / off status of the secondary compressor 23 and determining the target condensing pressure of the secondary air-conditioning system specifically includes: When the temperature of the main system power module 11 is greater than or equal to the first set temperature, the secondary compressor 23 is controlled to start, and the target condensing pressure is determined to be the first condensing pressure; When the temperature of the main system power module 11 is greater than or equal to the second set temperature and less than the third set temperature, the target condensing pressure is determined to be the second condensing pressure, and the secondary compressor 23 is running at this time; When the temperature of the main system power module 11 is greater than or equal to the third set temperature and less than the fourth set temperature, the target condensing pressure is determined to be the third condensing pressure, and the secondary compressor 23 is running at this time; When the temperature of the main system power module 11 is greater than or equal to the fourth set temperature, the target condensing pressure is determined to be the fourth condensing pressure, and the secondary compressor 23 operates at the set maximum frequency.

[0060] Among them, the second set temperature is greater than the first set temperature, the first condensation pressure is less than the second condensation pressure, the second condensation pressure is less than the third condensation pressure, and the third condensation pressure is less than the fourth condensation pressure.

[0061] Further, when the secondary compressor 23 is turned on, in the step of controlling and adjusting the operating frequency of the secondary compressor 23 according to the target condensing pressure until the actual condensing pressure of the secondary air-conditioning system reaches the target condensing pressure: When the target condensing pressure is the first condensing pressure, controlling the operating frequency of the secondary compressor 23 to not exceed a first percentage of the set maximum frequency; When the target condensing pressure is the second condensing pressure, controlling the operating frequency of the secondary compressor 23 to not exceed a second percentage of the set maximum frequency; When the target condensing pressure is the third condensing pressure, the operating frequency of the secondary compressor 23 is controlled not to exceed a third percentage of the set maximum frequency.

[0062] The first percentage is less than the second percentage, and the second percentage is less than the third percentage.

[0063] It can be understood that the temperature of the main system power module 11 of the main air-conditioning system is related to the refrigerant circulation volume and temperature difference of the secondary air-conditioning system. The higher the refrigerant circulation volume of the secondary air-conditioning system, the lower the temperature of the main system power module 11; the lower the outlet temperature of the condenser 22 of the secondary air-conditioning system, that is, the lower the supercooling degree of the condenser 22, the lower the inlet temperature of the refrigerant radiator 24, and the lower the temperature of the main system power module 11.

[0064] Specifically, the working frequency f of the secondary compressor 23 of the secondary air-conditioning system is operated according to the condensing pressure Pd. If the target condensing pressure cannot be reached, the secondary compressor 23 will continue to increase the frequency; if the target condensing pressure is reached, the frequency of the secondary compressor 23 tends to be stable; if the target condensing pressure is exceeded, the secondary compressor 23 will reduce the frequency, that is, the target condensing pressure is set in advance, the higher the temperature of the main system power module 11, the lower the target condensing pressure, the more the secondary compressor 23 needs to increase the frequency to reach the target condensing pressure, the frequency of the secondary compressor 23 is increased, the overall refrigerant circulation volume of the secondary air-conditioning system is increased, and the heat exchange temperature between the refrigerant radiator 24 and the main system power module 11 is increased, the cooling effect is also better, that is, the heat taken away from the main system power module 11 is also more, and the power module temperature is also reduced. The target condensing pressure can be set in advance according to the experimental results. Specifically, the target condensing pressure is related to the temperature of the main system power module 11.

[0065] For example, when the temperature of the main system power module 11 Tf ≥ Tao (ambient temperature) + 10°C and Tf ≥ 50°C, the secondary air conditioning system is turned on and operates. The protection temperature corresponding to the target condensing pressure Pd (taking R410a refrigerant as an example) is 49°C. PID control is implemented. After the secondary compressor 23 is started, the maximum operating frequency is 50% of the set maximum frequency to prevent the frequency of the secondary compressor 23 from fluctuating frequently. For every 1°C increase in Tf, the frequency of the secondary compressor 23 increases by 2Hz.

[0066] When 75℃>Tf ≥ 60℃, the protection temperature corresponding to the target condensing pressure Pd (taking R410a refrigerant as an example) is 51℃. For every 1℃ increase, the frequency of the secondary compressor 23 increases by 2Hz, and the maximum operating frequency of the secondary compressor 23 is 70% of the set maximum frequency.

[0067] When 90℃>Tf ≥ 75℃, the protection temperature corresponding to the target condensing pressure Pd (taking R410a refrigerant as an example) is 53℃. For every 1℃ increase, the frequency of the secondary compressor 23 increases by 3Hz, and the maximum operating frequency of the secondary compressor 23 is 85% of the set maximum frequency.

[0068] When Tf ≥ 90° C., the protection temperature corresponding to the target condensing pressure Pd (taking R410a refrigerant as an example) is 55° C. The secondary compressor 23 operates at the set maximum frequency.

[0069] PID control is implemented in all the above four situations. When the temperature of the main system power module 11 stops rising and becomes stable, the frequency of the secondary compressor 23 is reduced by 1 rps for 10 seconds after stabilization to prevent frequent fluctuations of the secondary air conditioning system.

[0070] In addition, when the temperature of the power module of the main air conditioning system decreases to 43° C.<Tf<45° C., the secondary compressor 23 of the secondary air conditioning system decreases to 10% of the set maximum frequency.

[0071] When the temperature of the power module of the main air-conditioning system drops to Tf<43°C and Tf≤Tao+5°C and lasts for 3 minutes, the secondary compressor 23 of the secondary air-conditioning system is shut down.

[0072] According to some embodiments of the present invention, the throttling element of the secondary air-conditioning system can be controlled according to the superheat of the evaporator 21 (in a system with a low-pressure pressure sensor, the superheat can be calculated by the evaporator 21 outlet temperature minus the saturation temperature corresponding to the low pressure) or the inlet and outlet temperature difference (in a system without a low-pressure pressure sensor, the superheat can be calculated by the evaporator 21 outlet temperature minus the evaporator 21 middle temperature), and the superheat is ≥0°C under normal operating conditions.

[0073] However, there are still special circumstances in this embodiment. For example, when the exhaust temperature of the secondary air-conditioning system is relatively high, the overheat degree of the refrigerant radiator 24 of the secondary air-conditioning system may be appropriately ≤0°C.

[0074] According to some embodiments of the present invention, the step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11 specifically includes: Determine that the operating frequency of the secondary compressor 23 reaches the set maximum frequency, and the temperature of the main system power module 11 is greater than or equal to a fourth set temperature; The operating frequency of the main compressor 14 is controlled and adjusted according to the temperature range of the main system power module 11 .

[0075] For example, when the temperature Tf of the main system power module 11 is ≥ 90°C, and the frequency of the secondary compressor 23 reaches the set maximum frequency and the running time exceeds 5 minutes, the main compressor 14 of the main air-conditioning system implements a step-down frequency strategy. That is, the secondary air-conditioning system has output the maximum capacity, but the temperature of the main system power module 11 still cannot be reduced. At this time, it is necessary to reduce the frequency of the main compressor 14 of the main air-conditioning system to reduce the heat generated by the main system power module 11.

[0076] In some specific embodiments of the present invention, the step of controlling and adjusting the operating frequency of the main compressor 14 according to the temperature range of the main system power module 11 specifically includes: When the temperature of the main system power module 11 is greater than or equal to the fourth set temperature and less than the fifth set temperature, the main compressor 14 is controlled to reduce the frequency to a first set ratio of the original operating frequency at a first frequency reduction speed; When the temperature of the main system power module 11 is greater than or equal to the fifth set temperature and less than the sixth set temperature, the main compressor 14 is controlled to reduce the frequency to a second set ratio of the original operating frequency at a second frequency reduction speed; When the temperature of the main system power module 11 is greater than or equal to the sixth set temperature and less than the seventh set temperature, the main compressor 14 is controlled to reduce the frequency to a third set ratio of the original operating frequency at a third frequency reduction speed; When the temperature of the main system power module 11 is greater than or equal to the seventh set temperature and less than the eighth set temperature, the main compressor 14 is controlled to reduce the frequency to a fourth set ratio of the original operating frequency at a fourth frequency reduction speed; When the temperature of the main system power module 11 is greater than or equal to the eighth set temperature, the main compressor 14 is controlled to stop.

[0077] Among them, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the third frequency reduction speed is less than the fourth frequency reduction speed, and the first setting ratio is greater than the second setting ratio, the second setting ratio is greater than the third setting ratio, and the third setting ratio is greater than the fourth setting ratio.

[0078] For example, when the temperature of the main system power module 11 is between 90°C and 92°C, the system detects that the temperature of the main system power module 11 is high, but not yet high enough to require a significant frequency reduction. Therefore, the frequency of the main compressor 14 is reduced to 75% of the original operating frequency at a relatively slow first frequency reduction speed (1 rps per second) to gently reduce the load of the main compressor 14.

[0079] When the temperature of the main system power module 11 is between 92°C and 94°C, the temperature rises further and the system adopts a faster frequency reduction strategy, reducing the frequency of the main compressor 14 to 50% of the original operating frequency at the second frequency reduction speed (2 rps per second), thereby accelerating the cooling speed.

[0080] When the temperature of the main system power module 11 is between 94°C and 96°C, the temperature continues to rise, and the system adopts a more aggressive frequency reduction strategy, reducing the frequency of the main compressor 14 to 25% of the original operating frequency at the third frequency reduction speed (3 rps per second), further increasing the cooling effect.

[0081] When the temperature of the main system power module 11 is between 96°C and 98°C, the temperature is close to the critical value. The system reduces the frequency of the main compressor 14 to 10% of the original operating frequency at the fourth fastest frequency reduction speed (4 rps per second), almost shutting down the main compressor 14 to prevent the temperature from continuing to rise.

[0082] When the temperature of the main system power module 11 reaches or exceeds 98° C., the system considers that the operation of the main compressor 14 is no longer safe, so it shuts down directly to prevent possible damage caused by further temperature rise.

[0083] In this way, through the above-mentioned graded frequency reduction strategy, the system can adjust the working state of the main compressor 14 in a timely manner according to the actual temperature change of the power module, thereby effectively controlling the temperature and ensuring the safe operation of the system.

[0084] According to some embodiments of the present invention, the control method of the dual-system air conditioner further includes: Obtaining the outlet temperature of the condenser 22 of the secondary air conditioning system; The operating parameters of the external fan of the secondary air-conditioning system are controlled and adjusted according to the outlet temperature of the condenser 22 and the temperature of the main system power module 11 .

[0085] It can be understood that in order to ensure that the outlet temperature of the condenser 22, that is, the inlet temperature of the refrigerant radiator 24, has a certain heat transfer temperature with the main system power module 11, the system controls the outlet temperature Tdef of the condenser 22. Specifically, the outlet temperature Tdef of the condenser 22 of the secondary air-conditioning system is compared with the temperature Tf of the main system power module 11, and the speed gear of the external fan is controlled.

[0086] In some specific embodiments of the present invention, according to the outlet temperature of the condenser 22 and the temperature of the main system power module 11, the operating parameters of the external fan of the secondary air conditioning system are controlled and adjusted, specifically including: When the difference between the temperature of the main system power module 11 and the outlet temperature of the condenser 22 is less than the first set difference, the external fan of the secondary air-conditioning system is controlled to maintain the set highest gear operation; When the difference between the temperature of the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the first set difference and less than the second set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the first upshift speed and the maximum gear does not exceed the first set gear; When the difference between the temperature of the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the second set difference and less than the third set difference, the external fan of the secondary air-conditioning system is controlled to maintain the current gear and not exceed the second set gear; When the difference between the temperature of the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the third set difference and less than the fourth set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the second upshift speed and the maximum gear does not exceed the third set gear; When the difference between the temperature of the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the fourth set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the third upshift speed and not exceed the fourth set gear.

[0087] Among them, the first upshift speed is greater than the second upshift speed, the second upshift speed is greater than the third upshift speed, and the first set gear is greater than the second set gear, the second set gear is greater than the third set gear, and the third set gear is greater than the fourth set gear.

[0088] For example, when the difference between the temperature (Tf) of the main system power module 11 and the outlet temperature (Tdef) of the condenser 22 is less than the first set difference (10°C), the external fan of the secondary air conditioning system is controlled to maintain the set highest gear operation. At this time, the external fan will be maintained at the highest wind speed to maximize the subcooling degree of the outlet of the secondary system condenser 22.

[0089] When the temperature difference between the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the first set difference (10°C) and less than the second set difference (15°C), the external fan of the secondary air conditioning system is controlled to increase the gear according to the first gear-up speed (10 seconds per gear), but the maximum does not exceed the first set gear (75%). At this time, the wind speed of the external fan will gradually increase, but will not exceed 75% of the highest gear.

[0090] When the temperature difference between the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the second set difference (15°C) and less than the third set difference (20°C), the external fan of the secondary air-conditioning system is controlled to maintain the current gear, but not more than the second set gear (50%). At this time, the external fan will maintain the existing wind speed and will not increase further, and the upper limit of the wind speed is 50% of the highest gear.

[0091] When the temperature difference between the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the third set difference (20°C) and less than the fourth set difference (25°C), the external fan of the secondary air conditioning system is controlled to increase the gear according to the second gear-up speed (1 gear in 20 seconds), but the maximum does not exceed the third set gear (25%). At this time, the wind speed of the external fan will increase slowly, but will not exceed 25% of the highest gear.

[0092] When the temperature difference between the main system power module 11 and the outlet temperature of the condenser 22 is greater than or equal to the fourth set difference (25°C), the external fan of the secondary air conditioning system is controlled to increase the gear according to the third gear-up speed (1 gear in 25 seconds), but the maximum does not exceed the fourth set gear (10%). At this time, the wind speed of the external fan will further increase slowly, but will not exceed 10% of the highest gear.

[0093] In this way, through the above method, the system can adjust the working state of the external fan of the secondary air-conditioning system according to the difference between the temperature of the main system power module 11 and the outlet temperature of the condenser 22, ensuring that the system can effectively dissipate heat under different working conditions while avoiding excessive energy consumption and equipment wear.

[0094] like Figure 3 As shown, a control device for a dual-system air conditioner according to a third aspect of the present invention includes: An acquisition module 110 is used to acquire the temperature of the main system power module 11; The control module 120 is used to control and adjust the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11 .

[0095] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the dual-system air conditioner, including: obtaining the temperature of the main system power module 11; and controlling and adjusting the working parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module 11.

[0096] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0097] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the dual-system air conditioner provided by the above methods, including: obtaining the temperature of the main system power module 11; controlling and adjusting the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11.

[0098] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the control method of the dual-system air conditioner provided by the above-mentioned methods, including: obtaining the temperature of the main system power module 11; controlling and adjusting the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module 11.

[0099] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0100] Through the description of the above implementation modes, those skilled in the art can clearly understand that each implementation mode can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on such an understanding, the above technical solution can essentially or in other words be embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-system air conditioner, characterized in that: include: A main air conditioning system, including a main refrigerant circuit and a main system power module, wherein the main refrigerant circuit includes an outdoor heat exchanger, an indoor heat exchanger and a main compressor; A secondary air conditioning system, comprising a secondary refrigerant circuit, the secondary refrigerant circuit comprising an evaporator, a condenser and a secondary compressor, a refrigerant radiator is connected in series between the evaporator and the condenser, and the refrigerant radiator is heat-transferably connected to the main system power module; The control device includes an acquisition module and a control module, wherein the acquisition module is used to acquire the temperature of the main system power module; the control module is used to control and adjust the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module.

2. A control method for the dual-system air conditioner according to claim 1, characterized in that: include: Acquiring the temperature of the main system power module; The operating parameters of the main air-conditioning system and / or the secondary air-conditioning system are controlled and adjusted according to the temperature of the main system power module.

3. The control method of the dual-system air conditioner according to claim 2, characterized in that: The step of controlling and adjusting the operating parameters of the main air conditioning system and / or the secondary air conditioning system according to the temperature of the main system power module specifically includes: According to the temperature range of the power module of the main system, the on / off status of the secondary compressor is controlled, and the target condensing pressure of the secondary air-conditioning system is determined; When the secondary compressor is turned on, the operating frequency of the secondary compressor is controlled and adjusted according to the target condensing pressure until the actual condensing pressure of the secondary air-conditioning system reaches the target condensing pressure.

4. The control method of the dual-system air conditioner according to claim 3, characterized in that: The step of controlling the on / off status of the secondary compressor according to the temperature range of the main system power module and determining the target condensing pressure of the secondary air-conditioning system specifically includes: When the temperature of the main system power module is greater than or equal to the first set temperature, controlling the secondary compressor to start, and determining the target condensing pressure to be the first condensing pressure; When the temperature of the main system power module is greater than or equal to the second set temperature and less than the third set temperature, determining the target condensing pressure to be the second condensing pressure, and the secondary compressor is running at this time; When the temperature of the main system power module is greater than or equal to the third set temperature and less than the fourth set temperature, determining the target condensing pressure to be the third condensing pressure, at which time the secondary compressor is running; When the temperature of the main system power module is greater than or equal to a fourth set temperature, determining the target condensing pressure to be a fourth condensing pressure, and at this time the secondary compressor operates at a set maximum frequency; The second set temperature is greater than the first set temperature, the first condensing pressure is less than the second condensing pressure, the second condensing pressure is less than the third condensing pressure, and the third condensing pressure is less than the fourth condensing pressure.

5. The control method of the dual-system air conditioner according to claim 4, characterized in that: In the case where the secondary compressor is turned on, in the step of controlling and adjusting the operating frequency of the secondary compressor according to the target condensing pressure until the actual condensing pressure of the secondary air-conditioning system reaches the target condensing pressure: When the target condensing pressure is the first condensing pressure, controlling the operating frequency of the secondary compressor to not exceed a first percentage of a set maximum frequency; When the target condensing pressure is the second condensing pressure, controlling the operating frequency of the secondary compressor to not exceed a second percentage of the set maximum frequency; When the target condensing pressure is a third condensing pressure, controlling the operating frequency of the secondary compressor to not exceed a third percentage of a set maximum frequency; The first percentage is smaller than the second percentage, and the second percentage is smaller than the third percentage.

6. The control method of the dual-system air conditioner according to any one of claims 2 to 5, characterized in that: The step of controlling and adjusting the operating parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module specifically includes: Determining that the operating frequency of the secondary compressor reaches a set maximum frequency and the temperature of the main system power module is greater than or equal to a fourth set temperature; The operating frequency of the main compressor is controlled and adjusted according to the temperature range of the main system power module.

7. The control method of the dual-system air conditioner according to claim 6, characterized in that: The step of controlling and adjusting the operating frequency of the main compressor according to the temperature range of the main system power module specifically includes: When the temperature of the main system power module is greater than or equal to a fourth set temperature and less than a fifth set temperature, controlling the main compressor to reduce the frequency to a first set ratio of the original operating frequency at a first frequency reduction speed; When the temperature of the main system power module is greater than or equal to the fifth set temperature and less than the sixth set temperature, the main compressor is controlled to reduce the frequency to a second set ratio of the original operating frequency at a second frequency reduction speed; When the temperature of the main system power module is greater than or equal to the sixth set temperature and less than the seventh set temperature, the main compressor is controlled to reduce the frequency to a third set ratio of the original operating frequency at a third frequency reduction speed; When the temperature of the main system power module is greater than or equal to the seventh set temperature and less than the eighth set temperature, controlling the main compressor to reduce the frequency to a fourth set ratio of the original operating frequency at a fourth frequency reduction speed; When the temperature of the main system power module is greater than or equal to an eighth set temperature, controlling the main compressor to stop; Among them, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the third frequency reduction speed is less than the fourth frequency reduction speed, and the first setting ratio is greater than the second setting ratio, the second setting ratio is greater than the third setting ratio, and the third setting ratio is greater than the fourth setting ratio.

8. The control method of the dual-system air conditioner according to any one of claims 2 to 5, characterized in that: Also includes: Obtaining the condenser outlet temperature of the secondary air conditioning system; The operating parameters of the external fan of the secondary air-conditioning system are controlled and adjusted according to the outlet temperature of the condenser and the temperature of the power module of the main system.

9. The control method of the dual-system air conditioner according to claim 8, characterized in that: The controlling and adjusting the operating parameters of the external fan of the secondary air conditioning system according to the condenser outlet temperature and the temperature of the main system power module specifically includes: When the difference between the temperature of the main system power module and the condenser outlet temperature is less than a first set difference, controlling the external fan of the secondary air-conditioning system to maintain the set highest gear operation; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to the first set difference and less than the second set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the first upshift speed and the maximum gear does not exceed the first set gear; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to the second set difference and less than the third set difference, the external fan of the secondary air-conditioning system is controlled to maintain the current gear and not exceed the second set gear at most; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to the third set difference and less than the fourth set difference, the external fan of the secondary air-conditioning system is controlled to increase the gear according to the second upshift speed and the maximum gear does not exceed the third set gear; When the difference between the temperature of the main system power module and the condenser outlet temperature is greater than or equal to a fourth set difference, controlling the external fan of the secondary air-conditioning system to increase the gear according to the third upshift speed and not exceeding the fourth set gear at most; Among them, the first upshift speed is greater than the second upshift speed, the second upshift speed is greater than the third upshift speed, and the first set gear is greater than the second set gear, the second set gear is greater than the third set gear, and the third set gear is greater than the fourth set gear.

10. A control device for a dual-system air conditioner according to claim 1, characterized in that: include: An acquisition module, used for acquiring the temperature of the main system power module; The control module is used to control and adjust the working parameters of the main air-conditioning system and / or the secondary air-conditioning system according to the temperature of the main system power module.

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