Flexible power utilization control method of direct-current air conditioner and direct-current air conditioner system

Abstract

The invention relates to the technical field of air conditioners, particularly provides a flexible power utilization control method of a direct-current air conditioner and a direct-current air conditioner system, and aims to solve the problems that flexible power utilization control of an existing direct-current air conditioner is relatively tedious, slow in response and low in reliability. In order to achieve the purpose, the flexible power utilization control method of the direct-current air conditioner comprises the step of determining the operation frequency of a compressor of the direct-current air conditioner according to bus voltage so as to adjust the power of the direct-current air conditioner. The operation frequency is directly adjusted according to the bus voltage, so that the power of the direct-current air conditioner can be directly adjusted instead of modifying the air conditioner temperature set by a user through information of a household energy management system and then feeding back to the direct-current air conditioner to adjust the frequency of the direct-current air conditioner, and then the power of the air conditioner is adjusted. According to the mode of the invention, adjustment can be directly carried out instead of a household energy management system and the like, the power grid load can be quickly responded, the frequency is adjusted according to the bus voltage, excessive communication is not needed, the reliability is high, and the cost is relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically provides a flexible power consumption control method for a DC air conditioner and a DC air conditioner system. Background Art

[0002] With the implementation of the "dual carbon" strategy and the proposal of the "photovoltaic, energy storage, DC, flexible" green building solution, the application market of photovoltaic air conditioners with the functions of "photovoltaic, energy storage, DC, flexible" is more extensive. However, the direct current output by the photovoltaic is affected by light and temperature, and the voltage of the DC power supply network fluctuates. When the voltage is low, if the air conditioner operates at a large power, it will increase the load on the power grid and also cause the voltage of the bus to increase, bringing unnecessary safety hazards.

[0003] Existing DC air conditioners require flexible power consumption control. Specifically, the home energy management system sends control instructions to the indoor unit of the air conditioner to change the user-set temperature, and then the air conditioner system reduces the operating power according to the instructions of the indoor unit, thereby achieving flexible power consumption control.

[0004] However, the main technical drawback of the above solution is that flexible power consumption control needs to rely on the information of the home energy management system to change the user-set temperature to achieve flexible power consumption control. This control method relying on communication has problems of slow response speed and low reliability. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problems that the flexible power consumption control of existing DC air conditioners is cumbersome, slow in response, and low in reliability.

[0006] In a first aspect, the present invention provides a flexible power consumption control method for a DC air conditioner, and the control method includes the following steps:

[0007] Determine the operating frequency of the compressor of the DC air conditioner according to the bus voltage to adjust the power of the DC air conditioner.

[0008] In a specific embodiment of the above flexible power consumption control method for a DC air conditioner, the control method further includes the following steps:

[0009] Before determining the operating frequency of the compressor, divide the voltage into multiple sections, and each section has a corresponding target operating frequency.

[0010] In a specific embodiment of the above flexible power consumption control method for a DC air conditioner, "divide the voltage into multiple sections, and each section has a corresponding target operating frequency" specifically includes:

[0011] The lower the voltage value of the section, the lower the corresponding target operating frequency.

[0012] In the specific implementation of the flexible power consumption control method for the above DC air conditioner, "dividing the voltage into multiple sections, each of which has a corresponding target operating frequency" specifically includes:

[0013] The voltage is divided into four sections, which are the first section, the second section, the third section, and the fourth section in descending order of voltage;

[0014] The target operating frequency corresponding to the first section is the preset frequency;

[0015] The target operating frequency corresponding to the second section is A% of the preset frequency, where A is less than 100;

[0016] The target operating frequency corresponding to the third section is B% of the preset frequency, where B is less than A;

[0017] The target operating frequency corresponding to the fourth section is C% of the preset frequency, where C is less than or equal to B.

[0018] In the specific implementation of the flexible power consumption control method for the above DC air conditioner, A is 90; B and C are 80.

[0019] In the specific implementation of the flexible power consumption control method for the above DC air conditioner, "determining the operating frequency of the DC air conditioner compressor according to the bus voltage" specifically includes the following steps:

[0020] Determine the section where the bus voltage is located;

[0021] Determine the target operating frequency according to the section;

[0022] Control the compressor of the DC air conditioner to operate at the target operating frequency.

[0023] In the specific implementation of the flexible power consumption control method for the above DC air conditioner, the DC air conditioner can be directly adjusted from the current operating frequency to the target operating frequency corresponding to any other section.

[0024] In a second aspect, the present invention provides a DC air conditioner system, which includes a DC air conditioner, a voltage detection module, and a control module; the DC air conditioner and the voltage detection module are both communicatively connected to the control module;

[0025] The voltage detection module is used to detect the bus voltage and transmit it to the control module;

[0026] The control module can determine the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner.

[0027] In the specific implementation of the above DC air-conditioning system, before the control module determines the operating frequency of the compressor, the voltage is divided into multiple sections, and each section has a corresponding target operating frequency;

[0028] "Dividing the voltage into multiple sections, and each section has a corresponding target operating frequency" specifically includes:

[0029] The voltage is divided into four sections, and the voltages from high to low are the first section, the second section, the third section, and the fourth section in sequence;

[0030] The target operating frequency corresponding to the first section is the preset frequency;

[0031] The target operating frequency corresponding to the second section is A% of the preset frequency, where A is less than 100;

[0032] The target operating frequency corresponding to the third section is B% of the preset frequency, where B is less than A;

[0033] The target operating frequency corresponding to the fourth section is C% of the preset frequency, where C is less than or equal to B.

[0034] In the specific implementation of the above DC air-conditioning system, "the control module can determine the operating frequency of the DC air-conditioning compressor according to the bus voltage" specifically includes:

[0035] The control module determines the section where the bus voltage is located;

[0036] The control module determines the target operating frequency according to the section;

[0037] The control module controls the compressor of the DC air-conditioning to operate at the target operating frequency; and / or

[0038] The control module can control the DC air-conditioning to directly adjust from the current operating frequency to the target operating frequency corresponding to any other section.

[0039] In the case of adopting the above technical solution, the control method of the present invention can determine the operating frequency of the DC air-conditioning compressor according to the bus voltage to adjust the power of the DC air-conditioning; directly adjusting the operating frequency according to the bus voltage can enable the power of the DC air-conditioning to be directly adjusted, rather than modifying the air-conditioning temperature set by the user through the information of the home energy management system and then feeding it back to the DC air-conditioning to adjust the frequency of the DC air-conditioning, and then adjusting the power of the air-conditioning. The method of this application can directly adjust, rather than passing through the home energy management system, etc., can quickly respond to the grid load, and adjusts the frequency according to the bus voltage, without too much communication, with high reliability and low cost.

[0040] The voltage is divided into multiple sections, and each section has a corresponding target operating frequency. Moreover, the lower the voltage value of the section, the lower the corresponding target operating frequency. When the voltage change amplitude is small, it is not necessary to adjust the frequency of the DC air conditioner, which can avoid unnecessary frequent adjustments and ensure the stability of the DC air conditioner. Description of the Drawings

[0041] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which:

[0042] Figure 1 is the main step flowchart of "determining the operating frequency of the DC air conditioner compressor according to the bus voltage" provided by Embodiment 1 of the present invention;

[0043] Figure 2 is the specific step flowchart of "determining the operating frequency of the DC air conditioner compressor according to the bus voltage" provided by Embodiment 1 of the present invention;

[0044] Figure 3 is the specific step flowchart of the flexible power consumption control method of the DC air conditioner provided by Embodiment 1 of the present invention;

[0045] Figure 4 is the specific step flowchart of "the control module determines the operating frequency of the DC air conditioner compressor according to the bus voltage" provided by Embodiment 2 of the present invention;

[0046] Figure 5 is the specific step flowchart of the flexible power consumption control of the DC air conditioner system provided by Embodiment 2 of the present invention. Detailed Embodiments

[0047] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0048] It should be noted that in the description of the present invention, the terms indicating the direction or position relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or position relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "setting", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, indirectly connected through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Existing DC air conditioners require flexible power control. Specifically, the home energy management system sends control instructions to the indoor unit of the air conditioner to change the user-set temperature, and then the air conditioner system reduces the operating power according to the instructions of the indoor unit, thereby achieving flexible power control.

[0051] However, the main technical drawback of the above solution is that flexible power control needs to rely on the information of the home energy management system to change the user-set temperature to achieve flexible power control. This control method relying on communication has problems of slow response speed and low reliability. To solve the above technical problems, the present application discloses a flexible power control method for a DC air conditioner and a DC air conditioner system. The following will be described in detail with two embodiments.

[0052] Embodiment 1

[0053] This embodiment discloses a flexible power control method for a DC air conditioner. The control method includes the following steps:

[0054] Determine the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner. The above steps need to be performed every preset time interval, so that the DC air conditioner can be controlled in real time, that is, it can respond to the change of the bus voltage in real time. In this embodiment, the preset time is 5 minutes. In other embodiments, the preset time can also be 2 minutes, 3 minutes, 8 minutes, 10 minutes, or 15 minutes, etc. Specifically, it can be determined according to the change drive and frequency of the bus voltage.

[0055] The control method further includes the following steps:

[0056] Before performing the step of "determining the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner", obtain the bus voltage. The bus voltage can be specifically detected by a bus voltage detection circuit for subsequent control.

[0057] The control method further includes the following steps:

[0058] Before performing the step of "determining the operating frequency of the DC air-conditioning compressor based on the bus voltage to adjust the power of the DC air-conditioning", the voltage is divided into multiple sections, and each section has a corresponding target operating frequency; among them, the lower the voltage value of the section, the lower the corresponding target operating frequency; this can ensure that when the voltage is low, the operating power of the DC air-conditioning is low, thereby reducing the power grid load.

[0059] Among them, the specific setting of "dividing the voltage into multiple sections, and each section has a corresponding compressor operating frequency" is carried out at the time of factory, so that the DC air-conditioning can operate according to the above sections. Of course, it can also be set during installation, or set by the user using the device.

[0060] Among them, the specific content of "dividing the voltage into multiple sections, and each section has a corresponding compressor operating frequency" includes:

[0061] The voltage is divided into four sections, and the voltages from high to low are the first section, the second section, the third section and the fourth section in turn; among them, the voltage is represented by Vol. The voltage value corresponding to the first section is: Vol≥the first preset voltage, and the first preset voltage is preferably 365V in this embodiment. In other embodiments, the first preset voltage can also be other values. The voltage value corresponding to the second section is: the second preset voltage≤Vol<the first preset voltage; the second preset voltage is preferably 340V in this embodiment. In other embodiments, the second preset voltage can also be other values. The voltage corresponding to the third section: the third preset voltage≤Vol<the second preset voltage; the third preset voltage is preferably 320V in this embodiment. In other embodiments, the third preset voltage can also be other values. The voltage corresponding to the fourth section: Vol<the third preset voltage.

[0062] Regarding the division of the sections, it should be noted that although the voltage is divided into four sections in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also divide it into three sections, five sections or more sections, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0063] Regarding the value of the sections, it should be noted that although the sections are divided according to the above values in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also select other values as the dividing points, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0064] Among them, the target operating frequency corresponding to the first section is the preset frequency; the preset frequency is the normal operating frequency. That is, when in the first section, the voltage is relatively high, indicating that the DC grid load is not too high. Therefore, it can ensure that the DC air conditioner operates according to the set target temperature of the user, that is, the DC air conditioner can operate at the normal frequency.

[0065] The target operating frequency corresponding to the second section is A% of the preset frequency, where A is less than 100; the voltage in the second section has decreased, that is, it represents that the bus voltage has decreased. In order to maintain the stability of the power grid and reduce the grid load, the operating frequency of the compressor is reduced.

[0066] The target operating frequency corresponding to the third section is B% of the preset frequency, where B is less than A; the voltage in the third section has further decreased, that is, the bus voltage has further decreased. In order to maintain the stability of the power grid and reduce the grid load, the operating frequency of the compressor is further reduced.

[0067] The target operating frequency corresponding to the fourth section is C% of the preset frequency, where C is less than or equal to B; the voltage in the fourth section has decreased even further, that is, the bus voltage has decreased even further. In order to maintain the stability of the power grid and reduce the grid load, the operating frequency of the compressor is decreased even further.

[0068] Among them, the specific values of A, B, and C are: A is 90, and B and C are 80. Regarding the values of A, B, and C, it should be noted that although the values are taken as above in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also select other values for A, B, and C, which do not depart from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0069] As Figure 1 shown, among them, "determining the operating frequency of the DC air conditioner compressor according to the bus voltage" specifically includes:

[0070] Determining the section where the bus voltage is located; determining the target operating frequency according to the located section; controlling the compressor of the DC air conditioner to operate according to the target operating frequency.

[0071] The flexible power consumption control method of this DC air conditioner further includes: the DC air conditioner can directly adjust from the current operating frequency to the target operating frequency corresponding to any other section.

[0072] As Figure 2 shown, "determining the section where the bus voltage is located; determining the target operating frequency according to the section; controlling the compressor of the DC air conditioner to operate according to the target operating frequency" specifically includes the following steps:

[0073] S1. Determine whether the bus voltage is greater than or equal to the first preset voltage. If it is, proceed to step S2; if not, proceed to step S3.

[0074] S2. The DC air conditioner operates at a preset frequency. If the DC air conditioner is currently operating at the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at the preset frequency, adjust the DC air conditioner to operate at the preset frequency.

[0075] S3. Determine whether the bus voltage is greater than or equal to the second preset voltage. If it is, proceed to step S4; if not, proceed to step S5.

[0076] S4. The DC air conditioner operates at A% of the preset frequency. If the DC air conditioner is currently operating at A% of the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at A% of the preset frequency, adjust the DC air conditioner to operate at A% of the preset frequency.

[0077] S5. Determine whether the bus voltage is greater than or equal to the third preset voltage. If it is, proceed to step S6; if not, proceed to step S7.

[0078] S6. The DC air conditioner operates at B% of the preset frequency. If the DC air conditioner is currently operating at B% of the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at B% of the preset frequency, adjust the DC air conditioner to operate at B% of the preset frequency.

[0079] S7. The DC air conditioner operates at C% of the preset frequency. If the DC air conditioner is currently operating at C% of the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at C% of the preset frequency, adjust the DC air conditioner to operate at C% of the preset frequency.

[0080] As Figure 3 shown, the flexible power consumption control method for the DC air conditioner specifically includes the following steps:

[0081] S00. Obtain the bus voltage.

[0082] S01. Determine whether the bus voltage is greater than or equal to the first preset voltage. If it is, proceed to step S02; if not, proceed to step S03.

[0083] S02. If the DC air conditioner operates at the preset frequency, then after an interval of the preset time, proceed to step S00; if the DC air conditioner is currently operating at the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at the preset frequency, adjust the DC air conditioner to operate at the preset frequency.

[0084] S03. Determine whether the bus voltage is greater than or equal to the second preset voltage. If yes, proceed to step S04; if no, proceed to step S05.

[0085] S04. The DC air conditioner operates at the preset frequency of A%. After an interval of the preset time, proceed to step S00. If the DC air conditioner is currently operating at the preset frequency of A%, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at the preset frequency of A%, adjust the DC air conditioner to operate at the preset frequency of A%.

[0086] S05. Determine whether the bus voltage is greater than or equal to the third preset voltage. If yes, proceed to step S06; if no, proceed to step S07.

[0087] S06. The DC air conditioner operates at the preset frequency of B%. After an interval of the preset time, proceed to step S00. If the DC air conditioner is currently operating at the preset frequency of B%, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at the preset frequency of B%, adjust the DC air conditioner to operate at the preset frequency of B%.

[0088] S07. The DC air conditioner operates at the preset frequency of C%. After an interval of the preset time, proceed to step S00. If the DC air conditioner is currently operating at the preset frequency of C%, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at the preset frequency of C%, adjust the DC air conditioner to operate at the preset frequency of C%.

[0089] Embodiment 2

[0090] This embodiment discloses a DC air conditioner system, which includes a DC air conditioner, a voltage detection module, and a control module; the DC air conditioner and the voltage detection module are both communicatively connected to the control module; wherein the control module is specifically the controller of the DC air conditioner, and the voltage detection module is communicatively connected to the controller through a wire harness; of course, it can also be communicatively connected through wireless transmission means such as wifi or Bluetooth. In other embodiments, the control module can also be the controller of a flexible home appliance system, and the voltage detection module is communicatively connected to the controller through a wire harness; of course, it can also be communicatively connected through wireless transmission means such as wifi or Bluetooth.

[0091] The voltage detection module is used to detect the bus voltage and transmit the detection data to the control module;

[0092] The control module can determine the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner.

[0093] The above steps need to be performed every preset time interval, that is, the voltage needs to be detected once, and the operating frequency of the DC air conditioner compressor is determined according to the voltage. Performing it every preset time can enable real-time control of the DC air conditioner, that is, it can respond to changes in the bus voltage in real time. In this embodiment, the preset time is 5 minutes. In other embodiments, the preset time can also be 2 minutes, 3 minutes, 8 minutes, 10 minutes, 15 minutes, etc. Specifically, it can be determined according to the driving force and frequency of the change of the bus voltage.

[0094] Before the control module determines the operating frequency of the DC air conditioner compressor according to the bus voltage, the voltage is divided into multiple sections, and each section has a corresponding target operating frequency; among them, the lower the voltage value of the section, the lower the corresponding target operating frequency; this can ensure that when the voltage is low, the operating power of the DC air conditioner is low, thereby reducing the grid load.

[0095] Among them, "dividing the voltage into multiple sections, and each section has a corresponding compressor operating frequency" is specifically set at the time of factory, so that the DC air conditioner can operate according to the above sections. Of course, it can also be set during installation, or set by the user using the device. Specifically, the data is first stored in the control module and directly retrieved and used when performing the step of "determining the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner".

[0096] Among them, "dividing the voltage into multiple sections, and each section has a corresponding compressor operating frequency" specifically includes:

[0097] The voltage is divided into four sections, and the voltages from high to low are the first section, the second section, the third section, and the fourth section in turn; among them, the voltage is represented by Vol. The voltage value corresponding to the first section is: Vol≥the first preset voltage, where the first preset voltage is preferably 365V in this embodiment, and in other embodiments, the first preset voltage can also be other values. The voltage value corresponding to the second section is: the second preset voltage≤Vol<the first preset voltage; where the second preset voltage is preferably 340V in this embodiment, and in other embodiments, the second preset voltage can also be other values. The voltage corresponding to the third section: the third preset voltage≤Vol<the second preset voltage; where the third preset voltage is preferably 320V in this embodiment, and in other embodiments, the third preset voltage can also be other values. The voltage corresponding to the fourth section: Vol<the third preset voltage.

[0098] Regarding the division of sections, it should be noted that although the voltage is divided into four sections in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also divide it into three sections, five sections or more sections, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0099] Regarding the values of the sections, it should be noted that although the sections are divided and distinguished according to the above values in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also select other values as the division points, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0100] Among them, the target operating frequency corresponding to the first section is the preset frequency; the preset frequency is the normal operating frequency. That is, when in the first section, the voltage is relatively high, indicating that the DC power grid load is not too high. Therefore, it can ensure that the DC air conditioner operates according to the set target temperature of the user, that is, it can make the DC air conditioner operate at a normal frequency.

[0101] The target operating frequency corresponding to the second section is A% of the preset frequency, and A is less than 100; the voltage in the second section decreases, that is, it represents that the bus voltage decreases. In order to maintain the stability of the power grid and reduce the power grid load, the compressor operating frequency is reduced.

[0102] The target operating frequency corresponding to the third section is B% of the preset frequency, and B is less than A; the voltage in the third section further decreases, that is, the bus voltage further decreases. In order to maintain the stability of the power grid and reduce the power grid load, the compressor operating frequency is further reduced.

[0103] The target operating frequency corresponding to the fourth section is C% of the preset frequency, and C is less than or equal to B; the voltage in the fourth section further decreases, that is, the bus voltage further decreases. In order to maintain the stability of the power grid and reduce the power grid load, the compressor operating frequency is further reduced.

[0104] Among them, the specific values of A, B, and C are: A is 90, and B and C are 80. Regarding the values of A, B, and C, it should be noted that although the values are taken according to the above values in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can also select other values for A, B, and C, which do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0105] "The control module can determine the operating frequency of the DC air conditioner compressor according to the bus voltage" specifically includes:

[0106] The control module first determines the section where the bus voltage is located; then determines the target operating frequency according to the section; and then controls the compressor of the DC air conditioner to operate at the target operating frequency.

[0107] In addition, the control module can control the DC air conditioner to directly adjust from the current operating frequency to the target operating frequency corresponding to any other section.

[0108] As Figure 4 shown, "The control module first determines the section where the bus voltage is located; then determines the target operating frequency according to the section; and then controls the compressor of the DC air conditioner to operate at the target operating frequency" specifically includes the following steps:

[0109] S1. The control module determines whether the bus voltage is greater than or equal to the first preset voltage. If so, proceed to step S2; if not, proceed to step S3.

[0110] S2. The control module controls the DC air conditioner to operate at the preset frequency; if the DC air conditioner is currently operating at the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at the preset frequency, the control module adjusts the DC air conditioner to operate at the preset frequency.

[0111] S3. The control module determines whether the bus voltage is greater than or equal to the second preset voltage. If so, proceed to step S4; if not, proceed to step S5.

[0112] S4. The control module controls the DC air conditioner to operate at A% of the preset frequency. If the DC air conditioner is currently operating at A% of the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at A% of the preset frequency, the control module adjusts the DC air conditioner to operate at A% of the preset frequency.

[0113] S5. The control module determines whether the bus voltage is greater than or equal to the third preset voltage. If so, proceed to step S6; if not, proceed to step S7.

[0114] S6. The control module controls the DC air conditioner to operate at B% of the preset frequency. If the DC air conditioner is currently operating at B% of the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at B% of the preset frequency, the control module adjusts the DC air conditioner to operate at B% of the preset frequency.

[0115] S7. The control module controls the DC air conditioner to operate at C% of the preset frequency. If the DC air conditioner is currently operating at C% of the preset frequency, there is no need to adjust the operating frequency of the DC air conditioner; if the DC air conditioner is not currently operating at C% of the preset frequency, the control module adjusts the DC air conditioner to operate at C% of the preset frequency.

[0116] As Figure 5As shown, the flexible power consumption control of the DC air-conditioning system specifically includes:

[0117] S00. The voltage detection module detects the bus voltage and transmits it to the control module.

[0118] S01. The control module determines whether the bus voltage is greater than or equal to the first preset voltage. If so, step S02 is performed; if not, step S03 is performed.

[0119] S02. The control module controls the DC air-conditioning to operate at the preset frequency; if the DC air-conditioning is currently operating at the preset frequency, there is no need to adjust the operating frequency of the DC air-conditioning; if the DC air-conditioning is currently not operating at the preset frequency, the control module adjusts the DC air-conditioning to the preset frequency for operation.

[0120] S03. The control module determines whether the bus voltage is greater than or equal to the second preset voltage. If so, step S04 is performed; if not, step S05 is performed.

[0121] S04. The control module controls the DC air-conditioning to operate at A% of the preset frequency. If the DC air-conditioning is currently operating at A% of the preset frequency, there is no need to adjust the operating frequency of the DC air-conditioning; if the DC air-conditioning is currently not operating at A% of the preset frequency, the control module adjusts the DC air-conditioning to A% of the preset frequency for operation.

[0122] S05. The control module determines whether the bus voltage is greater than or equal to the third preset voltage. If so, step S06 is performed; if not, step S07 is performed.

[0123] S06. The control module controls the DC air-conditioning to operate at B% of the preset frequency. If the DC air-conditioning is currently operating at B% of the preset frequency, there is no need to adjust the operating frequency of the DC air-conditioning; if the DC air-conditioning is currently not operating at B% of the preset frequency, the control module adjusts the DC air-conditioning to B% of the preset frequency for operation.

[0124] S07. The control module controls the DC air-conditioning to operate at C% of the preset frequency. If the DC air-conditioning is currently operating at C% of the preset frequency, there is no need to adjust the operating frequency of the DC air-conditioning; if the DC air-conditioning is currently not operating at C% of the preset frequency, the control module adjusts the DC air-conditioning to C% of the preset frequency for operation.

[0125] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the 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 flexible power consumption control method for a direct current air conditioner, characterized in that, It includes the following steps: Determine the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner.

2. The control method according to claim 1, characterized in that This control method further includes the following steps: Before determining the operating frequency of the compressor, divide the voltage into multiple sections, and each section has a corresponding target operating frequency.

3. The control method according to claim 2, wherein "Dividing the voltage into multiple sections, and each section has a corresponding target operating frequency" specifically includes: The lower the voltage value of the section, the lower the corresponding target operating frequency.

4. The control method according to claim 3, wherein "Dividing the voltage into multiple sections, and each section has a corresponding target operating frequency" specifically includes: Divide the voltage into four sections, and the voltages from high to low are the first section, the second section, the third section, and the fourth section in sequence; The target operating frequency corresponding to the first section is the preset frequency; The target operating frequency corresponding to the second section is A% of the preset frequency, and A is less than 100; The target operating frequency corresponding to the third section is B% of the preset frequency, and B is less than A; The target operating frequency corresponding to the fourth section is C% of the preset frequency, and C is less than or equal to B.

5. The control method according to claim 4, wherein A is 90; B and C are 80.

6. The control method according to claim 4, characterized in that, "Determine the operating frequency of the DC air conditioner compressor according to the bus voltage" specifically includes the following steps: Determine the section where the bus voltage is located; Determine the target operating frequency according to the section; Control the compressor of the DC air conditioner to operate at the target operating frequency.

7. The control method according to claim 1, characterized in that The DC air conditioner can be directly adjusted from the current operating frequency to the target operating frequency corresponding to any other section.

8. A direct current air conditioning system, characterized in that, It includes a DC air conditioner, a voltage detection module, and a control module; the DC air conditioner and the voltage detection module are both communicatively connected to the control module; The voltage detection module is used to detect the bus voltage and transmit it to the control module; The control module can determine the operating frequency of the DC air conditioner compressor according to the bus voltage to adjust the power of the DC air conditioner.

9. The DC air-conditioning system according to claim 8, wherein Before the control module determines the operating frequency of the compressor, divide the voltage into multiple sections, and each section has a corresponding target operating frequency; "Dividing the voltage into multiple sections, and each section has a corresponding target operating frequency" specifically includes: Divide the voltage into four sections, and the voltages from high to low are the first section, the second section, the third section, and the fourth section in sequence; The target operating frequency corresponding to the first section is the preset frequency; The target operating frequency corresponding to the second section is A% of the preset frequency, and A is less than 100; The target operating frequency corresponding to the third section is B% of the preset frequency, and B is less than A; The target operating frequency corresponding to the fourth section is C% of the preset frequency, and C is less than or equal to B.

10. The DC air conditioning system according to claim 9, wherein "The control module can determine the operating frequency of the DC air conditioner compressor according to the bus voltage" specifically includes: The control module determines the section where the bus voltage is located; The control module determines the target operating frequency according to the section; The control module controls the compressor of the DC air conditioner to operate at the target operating frequency; and / or The control module can control the DC air conditioner to directly adjust from the current operating frequency to the target operating frequency corresponding to any other section.

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