Voltage fluctuation control method, medium and air conditioner control system

Abstract

The invention relates to the technical field of air conditioners, particularly provides a voltage fluctuation control method, a medium and an air conditioner control system, and aims to solve the problem that an air conditioner is damaged due to unstable power supply voltage. In order to achieve the purpose, the voltage fluctuation control method is applied to an air conditioner control system, the air conditioner control system comprises an air conditioner and a standby power supply, and the method comprises the steps that when the air conditioner is connected into a power grid, the power grid voltage and the power grid voltage change rate are obtained in real time or at preset time intervals; and based on the power grid voltage and the power grid voltage change rate, selectively changing the operation frequency of a compressor of the air conditioner and / or switching a power supply of the air conditioner as the standby power supply, so that the standby power supply supplies power to the air conditioner. The problems that the air conditioner is unstable in operation, fails and even is damaged due to fluctuation of the power supply voltage are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and specifically provides a voltage fluctuation control method, a medium and an air conditioner control system. Background Art

[0002] With the widespread use of air conditioners around the world, there are problems with unstable power supply environment and large voltage fluctuations in South Asia, Latin America, Middle East and Africa, which can easily cause unstable operation, malfunctions and even damage of air conditioners.

[0003] The mainstream solution in the market is to increase the specifications of electrical components to improve their ability to resist voltage fluctuations, but this solution can only alleviate the impact of voltage fluctuations and cannot fundamentally solve the problem. Moreover, when the voltage fluctuation is too large, even if the solution in the prior art is adopted, it will still cause damage to the air conditioner, affect normal use, and cause economic losses.

[0004] Accordingly, the art needs a new voltage fluctuation control solution to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention is proposed to provide a voltage fluctuation control method, a medium and an air conditioner control system to solve or at least partially solve the technical problem of air conditioner damage caused by unstable power supply voltage.

[0006] In a first aspect, the present invention provides a voltage fluctuation control method, which is applied to an air conditioner control system, wherein the air conditioner control system includes an air conditioner and a backup power supply, and the method includes:

[0007] When the air conditioner is connected to the power grid, the power grid voltage and the power grid voltage change rate are obtained in real time or at preset time intervals;

[0008] Based on the grid voltage and the grid voltage change rate, the compressor operating frequency of the air conditioner is selectively changed and / or the power supply of the air conditioner is switched to the backup power supply, so that the backup power supply supplies power to the air conditioner.

[0009] In a technical solution of the voltage fluctuation control method, selectively changing the compressor operating frequency of the air conditioner and / or switching the power supply of the air conditioner to the backup power supply based on the grid voltage and the grid voltage change rate includes:

[0010] When the grid voltage is in a first preset voltage interval, or the grid voltage change rate is not lower than a preset voltage change rate threshold, the power supply of the air conditioner is switched to the backup power supply.

[0011] In a technical solution of the voltage fluctuation control method, the method further comprises: when the grid voltage is in a second preset voltage interval and the grid voltage change rate is lower than a preset voltage change rate threshold, reducing the current operating frequency of the compressor of the air conditioner;

[0012] The second preset voltage range is closer to the standard voltage of the power grid than the first preset voltage range.

[0013] In a technical solution of the voltage fluctuation control method, the method further includes obtaining the operating frequency of the compressor of the air conditioner; and reducing the current operating frequency of the compressor of the air conditioner includes:

[0014] When the current operating frequency of the compressor is higher than the preset operating frequency threshold, the current operating frequency of the compressor is controlled to be reduced by a first preset value, and the maximum operating frequency of the compressor of the air conditioner is set to be lower than the rated frequency;

[0015] When the current operating frequency of the compressor is not higher than the preset operating frequency threshold, the compressor of the air conditioner is controlled to operate at the lowest frequency.

[0016] In a technical solution of the above voltage fluctuation control method, the method further includes:

[0017] When the current operating frequency of the compressor is not higher than a preset operating frequency threshold, if the air conditioner is shut down for protection, the power supply of the air conditioner is switched to the backup power supply.

[0018] In a technical solution of the above voltage fluctuation control method, the air conditioner control system further includes a power supply box, a first relay, a second relay, and a self-adjusting controller, the first relay is used to connect the backup power supply and the air conditioner, the second relay is used to connect the power supply box and the air conditioner, and the power supply box is used to connect the air conditioner to a power grid; the switching of the power supply of the air conditioner to the backup power supply includes:

[0019] Based on the self-regulating controller, the first relay, the second relay and the backup power supply are controlled to switch the power supply of the air conditioner to the backup power supply.

[0020] In a technical solution of the voltage fluctuation control method, the backup power source is an engine; and the switching of the power supply of the air conditioner to the backup power source comprises:

[0021] The outdoor unit of the air conditioner is controlled to stop, the second relay is disconnected, and the generator is started at the same time; after a preset time, the first relay is closed, and the outdoor unit resumes operation;

[0022] Wherein, when the power supply of the air conditioner is switched to the backup power supply, the indoor unit of the air conditioner does not stop but operates normally.

[0023] In a second aspect, a computer-readable storage medium is provided, in which a plurality of program codes are stored, wherein the program codes are suitable for being loaded and run by a processor to execute the voltage fluctuation control method described in any one of the technical solutions of the above-mentioned voltage fluctuation control method.

[0024] In a third aspect, an air conditioner control system is provided, comprising an air conditioner, a backup power supply, a processor and a memory, wherein the memory is suitable for storing a plurality of program codes, and the program codes are suitable for being loaded and run by the processor to execute the voltage fluctuation control method described in any one of the technical solutions of the above-mentioned voltage fluctuation control method.

[0025] In a technical solution of the above-mentioned air conditioner control system, it also includes a power supply box, a first relay, and a second relay. The first relay is used to connect the backup power supply and the air conditioner, and the second relay is used to connect the power supply box and the air conditioner. The power supply box is used to connect the air conditioner to the power grid.

[0026] The above one or more technical solutions of the present invention have at least one or more of the following Beneficial effects:

[0027] In the technical solution of the present invention, by selectively changing the operating frequency of the air conditioner compressor and / or switching the power supply of the air conditioner to a backup power supply, the problem of unstable operation, malfunction or even damage of the air conditioner caused by power supply voltage fluctuations is solved.

[0028] In the technical solution of the present invention, when the power supply voltage fluctuation range is small, the compressor operating frequency of the air conditioner is reduced so that the air conditioner can continue to be powered by the power grid and operate stably; when the power supply voltage fluctuates greatly, the generator is switched to supply power to ensure that the air conditioner is not interfered by the power grid and can operate safely and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the figures are used to represent similar components, among which:

[0030] Figure 1 is a flow chart of the main steps of a voltage fluctuation control method according to an embodiment of the present invention;

[0031] Figure 2is a schematic diagram of an air conditioner control system to which a voltage fluctuation control method according to an embodiment of the present invention is applied;

[0032] Figure 3 is a detailed flowchart of a voltage fluctuation control method according to an embodiment of the present invention;

[0033] Figure 4 FIG. 4 is a main structural block diagram of an air conditioner control system according to an embodiment of the present invention.

[0035] Reference numerals list :

[0036] 21: outdoor unit; 22: generator; 23: power supply box; 24: first relay; 25: second relay;

[0037] 400: air conditioner control system; 401: air conditioner; 402: backup power supply; 403: processor; 404: memory; 405: program code. DETAILED DESCRIPTION

[0038] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0039] In the description of the present invention, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software parts, such as program codes, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware, or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program codes, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, and the like. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B", and may include only A, only B, or A and B. The singular terms "one" and "the" may also include plural forms.

[0040] See attached Figure 1 , Figure 1The figure is a flow chart of the main steps of a voltage fluctuation control method according to an embodiment of the present invention. The voltage fluctuation control method is applied to an air conditioner control system, which includes an air conditioner and a backup power supply.

[0041] like Figure 1 As shown, the voltage fluctuation control method in the embodiment of the present invention mainly includes the following steps S11 to S12.

[0042] Step S11, when the air conditioner is connected to the power grid, the power grid voltage and the power grid voltage change rate are obtained in real time or at preset time intervals.

[0043] In this embodiment, the grid voltage refers to the grid power supply voltage detected in real time when the power supply of the air conditioner is the grid. The grid voltage change rate refers to a physical quantity representing the voltage change obtained by differentiating the grid voltage.

[0044] Step S12, based on the grid voltage and the grid voltage change rate, selectively changing the compressor operating frequency of the air conditioner and / or switching the power supply of the air conditioner to the backup power supply, so that the backup power supply supplies power to the air conditioner.

[0045] In one embodiment of the present invention, when the grid voltage is in a first preset voltage interval, or the grid voltage change rate is not lower than a preset voltage change rate threshold, the power supply of the air conditioner is switched to the backup power supply.

[0046] In one embodiment, if the standard voltage of the power grid is A 0 , the first preset voltage interval is less than or equal to 0.7A 0 Or greater than or equal to 1.3A 0 The preset voltage change rate threshold is 10V / min. Exemplarily, the backup power source may be a generator.

[0047] That is, when the grid voltage A and the grid voltage change rate B meet: A≤0.7A 0 or 1.3A 0 ≤A, or B≥10V / min, the power supply is switched to the generator.

[0048] In one embodiment of the present invention, the method further comprises:

[0049] When the grid voltage is in a second preset voltage interval and the grid voltage change rate is lower than a preset voltage change rate threshold, the current operating frequency of the compressor of the air conditioner is reduced;

[0050] The second preset voltage range is closer to the standard voltage of the power grid than the first preset voltage range.

[0051] In one embodiment, if the standard voltage of the power grid is A 0 , the second preset voltage interval is greater than 0.7A 0 Less than 0.8A 0 or greater than 1.2A 0 Less than 1.3A 0 voltage range.

[0052] Furthermore, in one embodiment of the present invention, the method further includes obtaining an operating frequency of a compressor of the air conditioner.

[0053] The lowering of the current operating frequency of the compressor of the air conditioner includes: when the current operating frequency of the compressor is higher than a preset operating frequency threshold, controlling the current operating frequency of the compressor to be lowered by a first preset value, and setting the maximum operating frequency of the compressor of the air conditioner to be lower than the rated frequency.

[0054] In one embodiment, the preset operating frequency threshold is 30 Hz; the first preset value is 10 Hz; the rated frequency is 60 Hz, and the maximum operating frequency of the air conditioner compressor is set to 50 Hz.

[0055] That is, when the grid voltage A, grid voltage change rate B and compressor operating frequency C meet the following conditions: 0.7A 0 <A<0.8A 0 or 1.2A 0 <A<1.3A 0 , and B<10V / min, and C>30HZ, the compressor operating frequency of the air conditioner is controlled to be reduced by 10HZ, and the maximum operating frequency of the compressor of the air conditioner is set to 50HZ.

[0056] If the compressor operating frequency of the air conditioner is reduced by 10HZ and the current compressor operating frequency is not greater than 50HZ, the air conditioner will operate at the compressor operating frequency after the reduction of 10HZ; if the compressor operating frequency of the air conditioner is reduced by 10HZ and is still greater than 50HZ, the air conditioner will operate at the operating frequency of 50HZ.

[0057] When the current operating frequency of the compressor is not higher than the preset operating frequency threshold, the compressor of the air conditioner is controlled to operate at the lowest frequency.

[0058] In one embodiment, the operating frequency of the air conditioner may be 15HZ-130HZ, and the compressor of the air conditioner is controlled to operate at a frequency of 15HZ.

[0059] That is, when the grid voltage A, grid voltage change rate B and compressor operating frequency C meet the following conditions: 0.7A 0 <A<0.8A 0 or 1.2A0 <A<1.3A 0 , and B<10V / min, and C≤30HZ, the compressor operating frequency of the air conditioner is controlled to be reduced to 15HZ.

[0060] Furthermore, in this embodiment, the method further includes:

[0061] When the current operating frequency of the compressor is not higher than the preset operating frequency threshold, if the air conditioner is shut down for protection, the power supply of the air conditioner is switched to the backup power supply. Exemplarily, the backup power supply may be a generator.

[0062] In one embodiment, when the grid voltage A satisfies 0.8A 0 ≤A≤1.2A 0 When the power supply voltage of the power grid fluctuates within a safe range, there is no need to change the operating frequency of the air conditioner compressor or switch the power supply.

[0063] In actual operation, the values ​​of the first preset voltage interval, the second preset voltage interval, the preset voltage change rate threshold, the first preset value, etc. are not limited to the examples in the above embodiments, and those skilled in the art can set them according to actual needs.

[0064] In one embodiment, see the attached Figure 2 The air conditioner control system further includes a power supply box 23, a first relay 24, a second relay 25, and a self-regulating controller (not shown in the figure), wherein the first relay 24 is used to connect the backup power supply and the air conditioner, and the second relay 24 is used to connect the power supply box 23 and the air conditioner, and the power supply box 23 is used to connect the air conditioner to the power grid; the switching of the power supply of the air conditioner to the backup power supply includes:

[0065] Based on the self-regulating controller, the first relay 24, the second relay 25 and the backup power supply are controlled to switch the power supply of the air conditioner to the backup power supply.

[0066] In one embodiment, the self-regulating controller is arranged on the outdoor unit 21 of the air conditioner. Figure 2 The self-regulating controller communicates with the first relay 24, the second relay 25 and the generator 22 to control the opening and closing of the first relay 24 and the second relay 25, and controls the start-up of the generator 22 to switch the power supply of the air conditioner to the backup power supply.

[0067] In other embodiments of the present invention, the self-regulating controller may not be arranged on the outdoor unit 21 of the air conditioner, as long as the above-mentioned control can be completed. For example, the self-regulating controller may be arranged on the indoor unit of the air conditioner, or may be arranged outside the air conditioner, such as in the cloud.

[0068] Specifically, the backup power source is the engine 22; and the switching of the power supply of the air conditioner 21 to the backup power source includes:

[0069] The outdoor unit of the air conditioner is controlled to stop, the second relay 25 is disconnected, and the generator 22 is started at the same time; after a preset time, the first relay 24 is closed, and the outdoor unit resumes operation; illustratively, the preset time may be 3 minutes.

[0070] When the power supply of the air conditioner 21 is switched to the backup power supply, the indoor unit of the air conditioner 21 does not stop but operates normally.

[0071] The above technical solution ensures that when the power supply of the air conditioner is switched to the backup power supply, the power grid and the backup power supply will not supply power at the same time, thereby ensuring the safe operation of the air conditioner.

[0072] Figure 3 FIG. 1 is a detailed flow chart of a voltage fluctuation control method according to an embodiment of the present invention. Figure 3 As shown:

[0073] Step S31, obtaining the grid voltage to which the air conditioner is connected, and differentiating the grid voltage to obtain the grid voltage change rate;

[0074] Step S32, obtaining the compressor operating frequency of the air conditioner;

[0075] Step S33, generating a control signal in the self-regulating controller based on the grid voltage, the grid voltage change rate, and the compressor operating frequency. Specifically, the control signal may refer to the embodiment of the above step S12;

[0076] Step S34, based on the control signal control, selectively changing the compressor operating frequency of the air conditioner and / or switching the power supply of the air conditioner to the backup power supply, so that the backup power supply supplies power to the air conditioner.

[0077] Based on the above steps S11 and S12, by selectively changing the compressor operating frequency of the air conditioner and / or switching the power supply of the air conditioner to a backup power supply, the problem of unstable operation, fault alarm or even damage of the air conditioner caused by power supply voltage fluctuations is solved.

[0078] When the power supply voltage fluctuates within a small range, the compressor operating frequency of the air conditioner is reduced so that the air conditioner can continue to use power from the grid and operate stably. When the power supply voltage fluctuates greatly, the generator is switched to supply power to ensure that the air conditioner is not interfered with by the grid and can operate safely and stably.

[0079] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art can understand that in order to achieve the effects of the present invention, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These changes are within the scope of protection of the present invention.

[0080] It is understood by those skilled in the art that the present invention implements all or part of the processes in the method of the above embodiment, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium that can carry the computer program code. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electric carrier signals and telecommunication signals.

[0081] Furthermore, the present invention also provides a computer-readable storage medium. In a computer-readable storage medium embodiment according to the present invention, the computer-readable storage medium can be configured to store a program for executing the voltage fluctuation control method of the above method embodiment, and the program can be loaded and run by a processor to implement the above voltage fluctuation control method. For ease of explanation, only the parts related to the embodiment of the present invention are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present invention. The computer-readable storage medium can be a storage device formed by various electronic devices. Optionally, the computer-readable storage medium in the embodiment of the present invention is a non-temporary computer-readable storage medium.

[0082] Furthermore, the present invention also provides an air conditioner control system. Figure 4 , Figure 4 It is a main structural block diagram of an air conditioner control system for executing the voltage fluctuation control method of the present invention.

[0083] like Figure 4 As shown, in one embodiment of the present invention, the air conditioner control system 400 includes an air conditioner 401, a backup power supply 402, a processor 403 and a memory 404, the memory 404 can be configured to store a program code 405 for executing the voltage fluctuation control method of the above method embodiment, and the processor 403 can be configured to execute the program code 405 in the memory 404, the program code 405 includes but is not limited to the program code 405 for executing the voltage fluctuation control method of the above method embodiment. For ease of explanation, only the part related to the embodiment of the present invention is shown, and for specific technical details not disclosed, please refer to the method part of the embodiment of the present invention.

[0084] In one embodiment, the processor 403 comprises a self-regulating controller.

[0085] In one embodiment, the air conditioner control system 400 also includes a power supply box, a first relay, and a second relay. The first relay is used to connect the backup power supply and the air conditioner, and the second relay is used to connect the power supply box and the air conditioner. The power supply box is used to connect the air conditioner to the power grid.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A voltage fluctuation control method, applied to an air conditioner control system, characterized in that: The air conditioner control system includes an air conditioner and a backup power supply, and the method includes: When the air conditioner is connected to the power grid, the power grid voltage and the power grid voltage change rate are obtained in real time or at preset time intervals; Based on the grid voltage and the grid voltage change rate, the compressor operating frequency of the air conditioner is selectively changed and / or the power supply of the air conditioner is switched to the backup power supply, so that the backup power supply supplies power to the air conditioner.

2. The method according to claim 1, characterized in that: The selectively changing the compressor operating frequency of the air conditioner and / or switching the power supply of the air conditioner to the backup power supply based on the grid voltage and the grid voltage change rate comprises: When the grid voltage is in a first preset voltage interval, or the grid voltage change rate is not lower than a preset voltage change rate threshold, the power supply of the air conditioner is switched to the backup power supply.

3. The method according to claim 2, characterized in that The method further comprises: When the grid voltage is in a second preset voltage interval and the grid voltage change rate is lower than a preset voltage change rate threshold, the current operating frequency of the compressor of the air conditioner is reduced; The second preset voltage range is closer to the standard voltage of the power grid than the first preset voltage range.

4. The method according to claim 3, characterized in that The method further includes obtaining the operating frequency of the compressor of the air conditioner; The lowering of the current operating frequency of the compressor of the air conditioner comprises: when the current operating frequency of the compressor is higher than a preset operating frequency threshold, controlling the current operating frequency of the compressor to be lowered by a first preset value, and setting the maximum operating frequency of the compressor of the air conditioner to be lower than the rated frequency; When the current operating frequency of the compressor is not higher than the preset operating frequency threshold, the compressor of the air conditioner is controlled to operate at the lowest frequency.

5. The method according to claim 4, characterized in that The method further comprises: When the current operating frequency of the compressor is not higher than a preset operating frequency threshold, if the air conditioner is shut down for protection, the power supply of the air conditioner is switched to the backup power supply.

6. The method according to claim 1, characterized in that The air conditioner control system further comprises a power supply box, a first relay, a second relay, and a self-adjusting controller, wherein the first relay is used to connect the backup power supply and the air conditioner, the second relay is used to connect the power supply box and the air conditioner, and the power supply box is used to connect the air conditioner to the power grid; The switching of the power supply of the air conditioner to the backup power supply comprises: Based on the self-regulating controller, the first relay, the second relay and the backup power supply are controlled to switch the power supply of the air conditioner to the backup power supply.

7. The method according to claim 6, characterized in that The backup power source is an engine; and the switching of the power supply of the air conditioner to the backup power source comprises: The outdoor unit of the air conditioner is controlled to stop, the second relay is disconnected, and the generator is started at the same time; after a preset time, the first relay is closed, and the outdoor unit resumes operation; Wherein, when the power supply of the air conditioner is switched to the backup power supply, the indoor unit of the air conditioner does not stop but operates normally.

8. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the voltage fluctuation control method according to any one of claims 1 to 7.

9. An air conditioner control system, comprising an air conditioner, a backup power supply, a processor and a memory, wherein the memory is suitable for storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by the processor to execute the voltage fluctuation control method according to any one of claims 1 to 7.

10. The air conditioner control system according to claim 9, characterized in that: It also includes a power supply box, a first relay, and a second relay. The first relay is used to connect the backup power supply and the air conditioner, the second relay is used to connect the power supply box and the air conditioner, and the power supply box is used to connect the air conditioner to the power grid.

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