Energy-saving control method, device, system and storage medium for fixed-frequency electric appliance

Abstract

The embodiment of the application discloses a kind of energy-saving control method, device, energy-saving control system and storage medium of fixed frequency electrical appliance, and intelligent frequency conversion device includes the energy-saving mode output branch and original mode output branch connected in parallel between power supply and fixed frequency electrical appliance, the energy-saving control method includes: after switching from current working state to the enabling state of energy-saving mode, in order to control the energy-consuming component contactor of the fixed frequency electrical appliance is disconnected, the original mode output branch is disconnected, the energy-saving mode output branch is turned on;According to the type of the current working state, after waiting for corresponding delay period according to delay strategy, control the energy-consuming component contactor of the fixed frequency electrical appliance is closed, and the working frequency and / or speed of the fixed frequency electrical appliance is adjusted by the frequency converter in the energy-saving mode output branch.

Description

Technical Field

[0001] This invention relates to the field of energy conservation, and in particular to an energy-saving control method, device, system, and computer-readable storage medium for fixed-frequency electrical appliances. Background Technology

[0002] Currently, in the field of electrical appliance applications, such as air conditioners, refrigerators, and washing machines, fixed-frequency types are launched first, and variable-frequency types are launched later as technology develops and progresses. Among them, fixed-frequency appliances have relatively higher energy consumption. However, in many application scenarios, there are fixed-frequency appliances that are still in use and have not yet reached the end of their service life. For example, in some data center computer rooms, the use of a large number of fixed-frequency air conditioners will lead to high energy consumption and high upgrade costs. Summary of the Invention

[0003] To address the existing technical problems, embodiments of the present invention provide an energy-saving control method, device, system, and computer-readable storage medium for fixed-frequency electrical appliances that can effectively save energy and have low upgrade costs.

[0004] The technical solution of this invention is implemented as follows:

[0005] In a first aspect, an energy-saving control method for a fixed-frequency electrical appliance is provided, applied to an intelligent frequency converter. The intelligent frequency converter includes an energy-saving mode output branch and a normal mode output branch connected in parallel between the power supply and the fixed-frequency electrical appliance. The energy-saving control method includes:

[0006] After switching from the current working state to the energy-saving mode, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is disconnected, the original mode output branch is disconnected, and the energy-saving mode output branch is turned on in sequence.

[0007] Based on the type of the current working state, after waiting for the corresponding delay period according to the delay strategy, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is controlled to close, and the operating frequency and / or speed of the fixed-frequency electrical appliance is adjusted through the output of the frequency converter in the energy-saving mode output branch.

[0008] Secondly, an energy-saving control device is provided, comprising:

[0009] The switching module is used to sequentially control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the original mode output branch to disconnect, and the energy-saving mode output branch to be turned on after switching from the current working state to the energy-saving mode enabled state.

[0010] The adjustment module is used to control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to close after waiting for the corresponding delay period according to the type of the current working state and through the inverter output in the energy-saving mode output branch to adjust the working frequency and / or speed of the fixed-frequency electrical appliance.

[0011] Thirdly, an energy-saving regulation system is provided, including a fixed-frequency electrical appliance and an intelligent frequency converter connected between the mains power output and the fixed-frequency electrical appliance; the intelligent frequency converter includes a memory, an energy-saving controller, and a mode switching circuit electrically connected to the energy-saving controller.

[0012] The mode switching circuit includes an energy-saving mode output branch and an original mode output branch connected in parallel between the mains power output and the fixed-frequency appliance. The memory stores a computer program. When the computer program is executed by the energy-saving controller, the energy-saving controller performs the energy-saving control method described in any embodiment of this application.

[0013] Fourthly, a computer-readable storage medium is provided, storing a computer program that, when executed by a processor, causes the processor to perform the energy-saving control method provided in any embodiment of this application.

[0014] The energy-saving control method provided in the above embodiments of this application connects a smart frequency converter to a fixed-frequency electrical appliance. The smart frequency converter includes an energy-saving mode output branch and a normal mode output branch connected in parallel between the power supply and the fixed-frequency electrical appliance. When switching from the current working state to the enabled state of the energy-saving mode, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is sequentially controlled to open, the normal mode output branch is opened, and the energy-saving mode output branch is turned on. According to the type of the current working state, after waiting for the corresponding delay period according to the delay strategy, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is controlled to close, and the output is generated through the frequency converter in the energy-saving mode output branch. Adjusting the operating frequency and / or speed of the fixed-frequency electrical appliance allows for the addition of an energy-saving mode without altering its design; only wiring changes are needed to connect it to the intelligent frequency converter, resulting in low upgrade costs. Furthermore, upon switching to energy-saving mode, the switching action proceeds sequentially: the contactor of the energy-consuming component of the fixed-frequency electrical appliance disconnects, the original mode output branch disconnects, the energy-saving mode output branch connects, and the contactor of the energy-consuming component of the fixed-frequency electrical appliance closes. This prevents damage to the fixed-frequency electrical appliance from large currents generated during mode switching, ensuring safe and smooth execution of mode switching. This effectively saves energy consumption of the fixed-frequency electrical appliance while improving its operational reliability.

[0015] The energy-saving control device, energy-saving control system, and computer-readable storage medium provided in the above embodiments belong to the same concept as the corresponding energy-saving control method embodiments, and thus have the same technical effects as the corresponding energy-saving control method embodiments, which will not be repeated here. Attached Figure Description

[0016] Figure 1This is a system architecture diagram of an optional application scenario for the energy-saving control method in one embodiment;

[0017] Figure 2 This is a flowchart of an energy-saving control method in one embodiment;

[0018] Figure 3 This is a schematic diagram of the mode switching mechanism in one embodiment;

[0019] Figure 4 This is a flowchart of energy-saving mode switching in an optional specific example;

[0020] Figure 5 This is a flowchart of the original mode switching in an optional specific example;

[0021] Figure 6 This is a schematic diagram of the energy-saving control device in one embodiment;

[0022] Figure 7 This is a schematic diagram of the structure of an energy-saving control system in one embodiment. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] In the following description, the expression “some embodiments” refers to a subset of all possible embodiments. However, it should be understood that “some embodiments” can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0026] Please see Figure 1This is a system architecture diagram for an optional application scenario of the energy-saving control method provided in this application embodiment, including a mains power supply 11, a fixed-frequency appliance 12, and an intelligent frequency converter 13 connected between the mains power supply and the fixed-frequency appliance. The fixed-frequency appliance 12 can be various fixed-frequency type electrical products such as air conditioners, refrigerators, and washing machines. The fixed-frequency appliance 12 can include one or more main energy-consuming components. Taking a fixed-frequency air conditioner as an example, the main energy-consuming components include one or more compressors and an internal fan; taking a fixed-frequency refrigerator as an example, the main energy-consuming component includes a compressor; taking a fixed-frequency washing machine as an example, the main energy-consuming component includes a motor. The intelligent frequency converter 13 is an intelligent device with storage and computing capabilities, loaded with a computer program that implements the energy-saving control method described in the embodiments of this application. The intelligent frequency converter 13 includes an energy-saving controller 131 and an energy-saving mode output branch 132 and an original mode output branch 133 electrically connected to the energy-saving controller 131. The energy-saving mode output branch 132 and the original mode output branch 133 are connected to the energy-consuming components one by one. The energy-saving controller 131 executes the computer program to upgrade the fixed-frequency electrical appliance 12 by adding an energy-saving mode.

[0027] The intelligent frequency converter 13 may include a display module. The computer program implementing the energy-saving control method described in this application embodiment can be a client. Users can open the client and perform human-machine interaction operations through the operation interface provided by the client. For example, the operation interface may include a switch button for energy-saving mode and original mode, supporting users to manually switch between energy-saving mode and original mode through the operation interface. The operation interface may include options for setting some operating parameters of the frequency converter in the energy-saving mode output branch 132, supporting users to adaptively adjust and adapt the operating parameters of the frequency converter according to the different types and models of the fixed-frequency electrical appliances 12 connected to the intelligent frequency converter 13.

[0028] Please see Figure 2 This application provides an energy-saving control method that can be applied to... Figure 1 The intelligent frequency converter shown includes the following steps:

[0029] S101, after switching from the current working state to the energy-saving mode enable state, the contactor of the energy-consuming component of the fixed frequency electrical appliance is disconnected, the original mode output branch is disconnected, and the energy-saving mode output branch is turned on in sequence.

[0030] The enabled state refers to the target object's operation enable signal being enabled, which can also be understood as the target object's permission to run signal. When in the enabled state, i.e., when the operation enable signal is enabled, the target object can only run upon receiving a start command. The target object refers to the controlled object in automation, such as the main energy-consuming components of a fixed-frequency electrical appliance. The intelligent frequency converter includes an energy-saving mode output branch and a raw mode output branch connected in parallel with the energy-consuming components of the fixed-frequency electrical appliance. The energy-saving mode refers to the mode in which the energy-saving mode output branch of the intelligent frequency converter controls the operation of the energy-consuming components of the fixed-frequency electrical appliance; the raw mode refers to the mode in which the raw mode output branch of the intelligent frequency converter controls the operation of the energy-consuming components of the fixed-frequency electrical appliance. The current operating state can be any state other than the enabled state of the energy-saving mode, such as the disabled state of the energy-saving mode or the enabled state of the raw mode. The intelligent frequency converter can switch from the current operating state to the enabled state of the energy-saving mode by the user manually operating through an interactive interface, or by checking whether the corresponding mode switching conditions are met according to pre-configured mode switching rules.

[0031] S103, according to the type of the current working state, after waiting for the corresponding delay period according to the delay strategy, control the contactor of the energy-consuming component of the fixed frequency electrical appliance to close, and adjust the working frequency and / or speed of the fixed frequency electrical appliance through the inverter output in the energy-saving mode output branch.

[0032] After switching to the energy-saving mode, different delay strategies are set to calculate the delay period based on the type of the current operating state before the switch. After sequentially controlling the contactor of the energy-consuming component of the fixed-frequency appliance to open, the original mode output branch to close, and the energy-saving mode output branch to open, the corresponding delay period is waited according to the delay strategy matched to the type of the current operating state before the contactor of the energy-consuming component of the fixed-frequency appliance is controlled to close. The operating frequency and / or speed of the fixed-frequency appliance is adjusted through the inverter output in the energy-saving mode output branch.

[0033] In the above embodiments, the intelligent frequency converter is connected to the fixed-frequency electrical appliance. When switching from the current working state to the enabled state of energy-saving mode, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is opened in sequence, the original mode output branch of the intelligent frequency converter is opened, and the energy-saving mode output branch is turned on. According to the type of the current working state, after waiting for the corresponding delay period according to the delay strategy, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is closed to realize the switching to energy-saving mode. Thus, upgrading fixed-frequency electrical appliances to an energy-saving mode can be achieved simply by changing the wiring to connect to the intelligent frequency converter, without requiring any changes to the design of the fixed-frequency electrical appliances, resulting in low upgrade costs. Secondly, after switching to energy-saving mode, the switching action is executed in the following sequence: the contactor of the energy-consuming component of the fixed-frequency electrical appliance is disconnected, the original mode output branch is disconnected, the energy-saving mode output branch is turned on, and the contactor of the energy-consuming component of the fixed-frequency electrical appliance is closed. When the intelligent frequency converter switches from other operating states to the enabled state of energy-saving mode, it first disconnects the contactor of the energy-consuming component of the fixed-frequency electrical appliance, completing the state switch between the original mode output branch and the energy-saving mode output branch, and then closes the contactor of the energy-consuming component of the fixed-frequency electrical appliance. This avoids the formation of large currents during mode switching that could damage the fixed-frequency electrical appliance, ensuring the safe and smooth execution of mode switching, and improving the reliability of operation while effectively saving the operating energy consumption of the fixed-frequency electrical appliance. For the intelligent frequency converter switching from other working states to the energy-saving mode, after completing the state switching between the original mode output branch and the energy-saving mode output branch, it remains inactive for a delay period before controlling the contactor of the energy-consuming component of the fixed frequency electrical appliance to close, thereby achieving current-limiting soft start of the energy-consuming component.

[0034] In some embodiments, the current operating state includes an unenabled state in energy-saving mode and an enabled state in original mode; the energy-saving control method further includes:

[0035] If the current working state is the power-saving mode with no enable state, the first delay period is determined according to the preset mode switching enable time period based on the first delay strategy.

[0036] If the current working state is the enabled state of the original mode, the second delay period is determined according to the preset mode switching enable time period and delay enable time period based on the second delay strategy.

[0037] Before the intelligent frequency converter switches to the enabled state of energy-saving mode, its other operating states can be the disabled state of energy-saving mode. If the device is already in energy-saving mode before the switch, the corresponding first delay strategy can primarily determine the delay period based on the mode-entry enabling time. For example, the first delay strategy can calculate the first delay period as twice the mode-entry enabling time. If the mode switching time is 5 seconds, then the first delay period is 10 seconds. Alternatively, the intelligent frequency converter can also be in the enabled state of the original mode before switching to the enabled state of energy-saving mode. For the case where the device is in a relative mode before the switch, the corresponding first delay strategy needs to combine the mode-entry enabling time and the delayed enabling time to determine the delay period. For example, the second delay strategy can calculate the second delay period as the sum of twice the mode-entry enabling time and the delayed enabling time. If the delayed enabling time is 180 seconds and the mode switching time is 5 seconds, then the second delay period is 190 seconds.

[0038] In the above embodiments, different delay strategies are set to calculate the delay period based on the different working states before switching to the energy-saving mode enable state. For the delay strategy of switching from relative mode to energy-saving mode, a delay enable period is added when calculating the delay period. After the delay period is reached without any action, the contactor of the energy-consuming component of the fixed frequency electrical appliance is controlled to close, so as to realize the current-limited soft start of the energy-consuming component and improve the reliability of switching from relative mode to energy-saving mode.

[0039] Optionally, after switching from the current operating state to the energy-saving mode enabling state, the following further applies:

[0040] The inverter in the energy-saving mode output branch is stopped, and after waiting for a preset mode switching enable time period, the steps of sequentially controlling the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the original mode output branch to disconnect, and the energy-saving mode output branch to turn on are executed.

[0041] In this embodiment, after switching from the current working state to the energy-saving mode enable state, the inverter in the energy-saving mode output branch is first controlled to stop and wait for a preset mode switching enable time period. Then, the execution actions of sequentially controlling the contactor of the energy-consuming component of the fixed frequency electrical appliance to disconnect, the original mode output branch to disconnect, and the energy-saving mode output branch to turn on are executed. The energy-saving controller first issues a control command to stop the inverter and waits for the preset mode switching enable time period to ensure that the inverter is turned off before the switching control is executed. This avoids the inverter being still running due to uncertain abnormal factors, which could lead to errors or safety risks in subsequent switching control, and improves the safety and reliability of switching to the energy-saving mode.

[0042] Optionally, the sequential control of disconnecting the contactor of the energy-consuming component of the fixed-frequency electrical appliance, disconnecting the original mode output branch, and turning on the energy-saving mode output branch includes:

[0043] The contactor of the energy-consuming component of the fixed-frequency electrical appliance is disconnected, and after a first time interval, the original mode output branch is disconnected; after a second time interval, the energy-saving mode output branch is turned on; or,

[0044] The mode switching enable time period is divided into multiple time intervals, and the contactor of the energy-consuming component of the fixed frequency electrical appliance is disconnected, the original mode output branch is disconnected, and the energy-saving mode output branch is turned on in sequence according to the corresponding time intervals.

[0045] In this embodiment, while maintaining the sequential order of the actions of disconnecting the contactor of the energy-consuming component of the fixed-frequency electrical appliance, disconnecting the original mode output branch, and turning on the energy-saving mode output branch, time intervals are provided for each action. The first time interval and the second time interval can be the same or different, and can be manually set by the user through the operation interface or can be a pre-set fixed time parameter. Optionally, the overall duration for disconnecting the contactor of the energy-consuming component of the fixed-frequency electrical appliance to complete the state switching of the original mode output branch and the energy-saving mode output branch can be set to be the same as the mode switching enable time period. The user can manually set the mode switching enable time period through the operation interface. In the process of executing the mode switching, the mode switching enable time period is divided into multiple time intervals proportionally, so that the actions of sequentially and intermittently controlling the disconnection of the contactor of the energy-consuming component of the fixed-frequency electrical appliance, disconnection of the original mode output branch, and turning on the energy-saving mode output branch are completed within the mode switching enable time period.

[0046] Optionally, the energy-saving control method further includes:

[0047] After switching from the enabled state of the energy-saving mode to the enabled state of the original mode, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is sequentially controlled to disconnect, the output branch of the energy-saving mode is disconnected, and the output branch of the original mode is turned on.

[0048] After waiting for the preset mode switching time period, the contactor of the energy-consuming component of the fixed-frequency electrical appliance is closed.

[0049] The mode switchout time period and the mode switch-in enable time period can be the same or different. The mode switchout time period can be manually set by the user through the operation interface or it can be a preset fixed time parameter. When switching from energy-saving mode to original mode, the current working state before the switch is mainly the enabled state of energy-saving mode. First, the contactor of the energy-consuming component of the fixed-frequency appliance is disconnected. After completing the state switch between the output branch of energy-saving mode and the output branch of original mode, the contactor of the energy-consuming component of the fixed-frequency appliance is closed after waiting for the preset mode switchout time period. This can effectively avoid the formation of large current during mode switching that could damage the fixed-frequency appliance, ensure the safe and smooth execution of mode switching, and improve work reliability. The transition from the unenabled state of original mode to the intelligent state of energy-saving mode can be adapted to existing control processes used for the start-up and operation of fixed-frequency appliances.

[0050] Optionally, after switching from the enabled state of the energy-saving mode to the enabled state of the original mode, the method further includes:

[0051] The inverter in the energy-saving mode output branch is stopped, and after waiting for a preset mode switching time period, the steps of sequentially controlling the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the energy-saving mode output branch to disconnect, and the original mode output branch to turn on are executed.

[0052] In this embodiment, after switching from energy-saving mode to original mode, the inverter in the output branch of energy-saving mode is first stopped and waits for a preset mode switching enable time period. Then, the contactors of the energy-consuming components of the fixed-frequency electrical appliances are disconnected, the output branch of energy-saving mode is disconnected, and the output branch of original mode is turned on in sequence. The energy-saving controller first issues a control command to stop the inverter and waits for a preset mode switching time period to ensure that the inverter is turned off before the branch switching control of different modes is executed. This avoids the inverter from still running due to uncertain abnormal factors, which could lead to errors or safety risks in subsequent switching control, and improves the safety and reliability of switching between original mode and energy-saving mode.

[0053] Optionally, the sequential control of disconnecting the contactor of the energy-consuming component of the fixed-frequency electrical appliance, disconnecting the energy-saving mode output branch, and turning on the original mode output branch includes:

[0054] The contactor of the energy-consuming component of the fixed-frequency electrical appliance is disconnected, and after a first time interval, the energy-saving mode output branch is disconnected; after a second time interval, the original mode output branch is turned on; or,

[0055] The mode switching time period is divided into multiple time intervals, and the contactor of the energy-consuming component of the fixed frequency electrical appliance is disconnected, the output branch of the energy-saving mode is disconnected, and the output branch of the original mode is turned on in sequence according to the corresponding time intervals.

[0056] In this embodiment, while maintaining the sequential order of the actions of disconnecting the contactor of the energy-consuming component of the fixed-frequency electrical appliance, disconnecting the energy-saving mode output branch, and turning on the original mode output branch, time intervals are provided for each action. The first time interval and the second time interval can be the same or different, and can be manually set by the user through the operation interface or can be a pre-set fixed time parameter. Optionally, the overall duration of disconnecting the contactor of the energy-consuming component of the fixed-frequency electrical appliance and switching the state of the energy-saving mode output branch and the original mode output branch can be set to be the same as the mode cut-out time period. The user can manually set the mode cut-out time period through the operation interface. In the process of executing the mode switching, the mode cut-out time period is divided into multiple time intervals proportionally, so that the actions of sequentially and intermittently controlling the disconnection of the contactor of the energy-consuming component of the fixed-frequency electrical appliance, disconnection of the energy-saving mode output branch, and turning on the original mode output branch are completed within the mode cut-out time period.

[0057] Optionally, the switching between energy-saving mode and original mode can be done manually by the user through an interactive interface, or by switching modes in real time according to pre-configured mode switching rules, which detect whether the corresponding mode switching conditions are met.

[0058] Please see Figure 3 In one optional example, the mode switching condition for energy-saving mode to switch from running to stopping may include one of the following: when a manual switching command to the original mode is received, when a shutdown alarm command is received during the operation of energy-saving mode, or when a shutdown command is received during the operation of energy-saving mode. According to the mode switching rules, if any of the above mode switching conditions are met, it can be regarded as receiving a mode switching command to switch from energy-saving mode to the original mode, and the switching control process from energy-saving mode to the original mode is executed.

[0059] The mode switching conditions from running to stopping in the original mode can be: when a manual switching command to energy-saving mode is received, there is no shutdown alarm, and the intelligent frequency converter is in the power-on state. According to the mode switching rules, when it is determined that the corresponding mode switching conditions are met, it can be regarded as receiving a control command to stop in the original mode and a mode switching command to switch from the original mode to the energy-saving mode, and the switching control process from the original mode to the energy-saving mode is executed.

[0060] In some embodiments, the fixed-frequency appliance is a fixed-frequency air conditioner, and the energy-consuming component contactor is a compressor contactor; the adjustment of the operating frequency and / or speed of the fixed-frequency appliance through the inverter output in the energy-saving mode output branch includes:

[0061] Based on the difference between the current control temperature and the target temperature, if the current control temperature is greater than the target temperature, the inverter in the energy-saving mode output branch increases the operating frequency and / or speed of the fixed-frequency electrical appliance.

[0062] If the current control temperature is lower than the target temperature, the inverter in the energy-saving mode output branch will reduce the operating frequency and / or speed of the fixed-frequency electrical appliance.

[0063] Intelligent inverter units can be equipped with temperature sensors, which can be placed near the original temperature sensor of the fixed-frequency air conditioner, thus ensuring that the controlled temperatures of both are similar. In energy-saving mode, the energy-saving controller can adjust the inverter's frequency output within the compressor's allowable frequency range based on the difference between the current controlled temperature and the target temperature. Specifically, the energy-saving controller receives the control temperature reported by the temperature sensor in real time. If the current controlled temperature is higher than the target temperature, the inverter outputs an increased frequency; the greater the temperature difference between the controlled and target temperatures, the greater the increase in the operating frequency and / or speed of the fixed-frequency appliance. Conversely, if the current controlled temperature is lower than the target temperature, the inverter outputs a decreased frequency; the greater the temperature difference between the controlled and target temperatures, the greater the decrease in the operating frequency and / or speed of the fixed-frequency appliance.

[0064] In some embodiments, the step of adjusting the operating frequency and / or speed of the fixed-frequency electrical appliance through the inverter output in the energy-saving mode output branch further includes:

[0065] In the energy-saving mode, if the operating frequency of the variable frequency appliance is lower than the rated frequency and / or the speed is lower than the speed threshold for a period of time exceeding the set oil return cycle, a frequency increase oil return control is executed to control the operating frequency of the variable frequency appliance to increase and maintain the target oil return frequency for a preset period of time before exiting.

[0066] In energy-saving mode, the compressor frequency and / or speed may remain below the rated frequency and / or below the speed threshold for a period of time. In this embodiment, a timed frequency-increase oil return mechanism is set. If the operating frequency of the inverter is below the rated frequency and / or the speed is below the speed threshold for a duration exceeding the set oil return cycle, a frequency-increase oil return control is executed. This controls the inverter's operating frequency to increase and maintain at the target oil return frequency, and / or its speed to increase and maintain at the target speed for a preset duration before exiting the control. The oil return cycle is typically eight hours. Within one frequency-increase oil return control cycle, the inverter's operating frequency increases and maintains at the target oil return frequency for three minutes before exiting the control.

[0067] In the above embodiments, by setting a timed frequency increase oil return mechanism, the oil can be smoothly circulated back into the compressor during the long-term continuous operation of the energy-saving mode, ensuring the continuous stability of the fixed-frequency air conditioner's working state.

[0068] In some embodiments, the step of adjusting the operating frequency and / or speed of the fixed-frequency electrical appliance through the inverter output in the energy-saving mode output branch further includes:

[0069] The current frequency reduction and / or speed reduction protection level is determined based on the deviation between the preset operating parameters of the fixed-frequency electrical appliance and / or the intelligent frequency converter and the corresponding reference parameter range; wherein, the preset operating parameters include at least one of the following: frequency converter current, frequency converter temperature, compressor exhaust temperature, and internal fan speed;

[0070] If the frequency reduction and / or speed reduction protection level is Level 1, the corresponding level protection scheme is activated to limit the frequency and / or reduce the rate of increase.

[0071] If the frequency reduction and / or speed reduction protection level is level two, the corresponding protection scheme is activated to limit the frequency and / or reduce the speed increase.

[0072] If the frequency reduction and / or speed reduction protection level is level three, the corresponding protection scheme is to limit the operating frequency and / or speed reduction to the lower limit frequency and / or lower limit speed.

[0073] In energy-saving mode, the compressor frequency and / or speed may remain high for a period of time. In this embodiment, a frequency reduction and / or speed reduction protection mechanism is set up. Three frequency reduction and / or speed reduction protection levels are set according to the difference between the inverter current, inverter temperature, and compressor discharge temperature and the expected safe range. For the three frequency reduction protection levels, corresponding level protection schemes are set up to limit the rate of increase of frequency and / or speed, limit the increase of frequency and / or speed, and limit the operating frequency and / or speed to the lower limit frequency and / or speed.

[0074] In this embodiment, by setting a frequency reduction protection mechanism, the compressor's operating frequency and / or speed can be intelligently adjusted based on the real-time detected inverter current, inverter temperature, exhaust temperature and internal fan speed during the long-term continuous operation of the energy-saving mode, ensuring the continuous stability of the fixed-frequency air conditioner's operating status.

[0075] In some embodiments, the energy-consuming components of the fixed-frequency air conditioner include multiple compressors and an indoor fan, and the energy-saving mode output branch and the original mode output branch include multiple sets corresponding one-to-one with multiple compressor contactors and the indoor fan;

[0076] The method of adjusting the operating frequency and / or speed of the fixed-frequency electrical appliance through the inverter output in the energy-saving mode output branch includes:

[0077] In the energy-saving mode, the operating frequency and / or speed of the compressor and the speed of the internal fan are adjusted respectively by the frequency converter output in each of the energy-saving mode output branches.

[0078] In the intelligent frequency converter, the energy-saving mode output branch and the original mode output branch connected in parallel form a group. The number of groups of energy-saving mode output branches and original mode output branches is the sum of the number of compressors and the number of internal fans. Each group of energy-saving mode output branches and original mode output branches corresponds one-to-one with a compressor and an internal fan, respectively. The intelligent frequency converter intelligently controls the compressor operation by switching between energy-saving mode and original mode, and also dynamically adjusts the speed of the internal fan according to the difference between the current controlled temperature and the target temperature.

[0079] Please see Figure 4 To provide a more comprehensive understanding of the energy-saving control method provided in this application, a fixed-frequency air conditioner is used as an example for illustration. The energy-saving mode switching process in the energy-saving control method includes:

[0080] S111, the compressor is already running in energy-saving mode, but the enable signal is not enabled; S112, the compressor is already running in energy-saving mode, but the enable signal is enabled.

[0081] Alternatively, S113, the compressor operation enable signal in the original mode is enabled; S114, the compressor operation enable signal in the energy-saving mode is enabled.

[0082] S12, Inverter stops; Waiting mode switch-in enable time is 5 seconds;

[0083] S13, compressor contactor disconnected; wait 2 seconds;

[0084] S14, the original mode output contactor is disconnected; wait 1 second;

[0085] S15, the energy-saving mode output contactor engages;

[0086] Hold still for 2 seconds;

[0087] Based on the original mode before switching in, after waiting for the sum of the 2x mode switching enable time of 5 seconds and the delay enable time of 180 seconds, the compressor contactor engages at S16.

[0088] Alternatively, if the mode before switching is already in energy-saving mode, wait for 5 seconds after the twice-mode switching enable time, then at S16, the compressor contactor engages.

[0089] After a 5-second wait time before the mode switch-in enable time,

[0090] S17, the frequency converter is running.

[0091] In the above embodiments, after switching from the original mode to the energy-saving mode, the compressor contactor is first disconnected, then the original mode contactor and the energy-saving mode contactor are sequentially disconnected and engaged. After the circuit switching is completed, a delay is made before the inverter outputs to adjust the compressor frequency and / or speed. When the enable signal in the energy-saving mode switches from non-enabled to enabled, there is no logic for this delay in driving the inverter output, and the inverter is promptly driven to adjust the compressor frequency and / or speed. In this way, the large current generated during mode switching can be avoided from damaging the fixed-frequency electrical appliances, ensuring the safe and smooth execution of mode switching, and improving the reliability of operation while effectively saving the working energy consumption of the fixed-frequency electrical appliances.

[0092] Please see Figure 5 The energy-saving control method includes the following original mode switching process:

[0093] S21, the compressor operation enable signal in energy-saving mode has been enabled;

[0094] S22, the original mode compressor operation status enable signal is enabled;

[0095] S23, Inverter stops output; wait 5 seconds for enable switch-out.

[0096] S24, compressor contactor disconnected; wait 5 seconds for enable cut-off;

[0097] S25, Energy-saving mode output contactor disconnects; wait 1 second;

[0098] S26, original mode output contactor engages; wait 4 seconds;

[0099] S27, the compressor contactor engages.

[0100] In the above embodiments, when the energy-saving mode is switched to the original mode, the compressor contactor is first disconnected, and then the energy-saving mode contactor and the original mode contactor are disconnected in sequence. After the circuit switching is completed, the compressor contactor is then engaged, so that the compressor runs at a fixed frequency. This can effectively avoid the large current generated during the mode switching from damaging the fixed-frequency electrical appliance, ensure the safe and smooth execution of the mode switching, and improve the reliability of the operation.

[0101] Please see Figure 6In another aspect, this application provides a cooling system control device, including a switching module 61, which, after switching from the current operating state to the enabled state of energy-saving mode, sequentially controls the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the original mode output branch to disconnect, and the energy-saving mode output branch to connect; and an adjustment module 62, which, according to the type of the current operating state, waits for the corresponding delay period according to a delay strategy, controls the contactor of the energy-consuming component of the fixed-frequency electrical appliance to close, and adjusts the operating frequency of the fixed-frequency electrical appliance through the inverter output in the energy-saving mode output branch.

[0102] Optionally, the adjustment module 62 is further configured to, if the current working state is an energy-saving mode with no enable state, determine a first delay period according to a preset mode switching enable time period based on a first delay strategy; and if the current working state is an original mode with enable state, determine a second delay period according to a second delay strategy based on a preset mode switching enable time period and a delayed enable time period based on a second delay strategy.

[0103] Optionally, the switching module 61 is further configured to, after switching from the current working state to the energy-saving mode enabling state, control the inverter in the energy-saving mode output branch to stop, wait for a preset mode switching enabling time period, and then execute the steps of sequentially controlling the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the original mode output branch to disconnect, and the energy-saving mode output branch to be turned on.

[0104] Optionally, the switching module 61 is specifically used to control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, and after waiting for a first time interval, control the original mode output branch to disconnect, and after waiting for a second time interval, control the energy-saving mode output branch to turn on; or, divide the mode switching enable time period into multiple time intervals, and control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the original mode output branch to disconnect, and the energy-saving mode output branch to turn on in sequence according to the corresponding time intervals.

[0105] Optionally, the switching module 61 is further configured to, after switching from the enabled state of the energy-saving mode to the enabled state of the original mode, sequentially control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the output branch of the energy-saving mode to disconnect, and the output branch of the original mode to be turned on; after waiting for a preset mode switching time period, the adjustment module 62 controls the contactor of the energy-consuming component of the fixed-frequency electrical appliance to close.

[0106] Optionally, the switching module 61 is also used to control the inverter in the energy-saving mode output branch to stop, wait for a preset mode switching time period, and then execute the steps of sequentially controlling the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the energy-saving mode output branch to disconnect, and the original mode output branch to turn on.

[0107] Optionally, the switching module 61 is specifically used to control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, and after waiting for a first time interval, control the output branch of the energy-saving mode to disconnect, and after waiting for a second time interval, control the output branch of the original mode to turn on; or, divide the mode switching time period into multiple time intervals, and control the contactor of the energy-consuming component of the fixed-frequency electrical appliance to disconnect, the output branch of the energy-saving mode to disconnect, and the output branch of the original mode to turn on in sequence according to the corresponding time intervals.

[0108] Optionally, the fixed-frequency electrical appliance is a fixed-frequency air conditioner, and the energy-consuming component contactor is a compressor contactor; the adjustment module 62 is further configured to, based on the difference between the current controlled temperature and the target temperature, increase the operating frequency and / or speed of the fixed-frequency electrical appliance through the inverter output in the energy-saving mode output branch if the current controlled temperature is greater than the target temperature; and decrease the operating frequency and / or speed of the fixed-frequency electrical appliance through the inverter output in the energy-saving mode output branch if the current controlled temperature is less than the target temperature.

[0109] Optionally, the adjustment module 62 is further configured to, in the energy-saving mode, if the operating frequency and / or speed of the variable frequency appliance is lower than the rated frequency and / or the speed is lower than the speed threshold for a period of time exceeding the set oil return cycle, perform a frequency increase and / or speed increase oil return control, control the operating frequency of the variable frequency appliance to increase and maintain at the target oil return frequency, and / or the speed to increase and maintain at the target speed for a preset duration before exiting.

[0110] Optionally, the adjustment module 62 is further configured to determine the current frequency reduction and / or speed reduction protection level based on the deviation between the preset operating parameters of the fixed-frequency electrical appliance and / or the intelligent frequency converter and the corresponding reference parameter range; wherein, the preset operating parameters include at least one of the following: frequency converter current, frequency converter temperature, and compressor exhaust temperature; if the frequency reduction and / or speed reduction protection level is Level 1, the corresponding protection scheme is activated to limit the frequency and / or speed increase rate; if the frequency reduction and / or speed reduction protection level is Level 2, the corresponding protection scheme is activated to limit the frequency and / or speed increase; if the frequency reduction and / or speed reduction protection level is Level 3, the corresponding protection scheme is activated to limit the operating frequency and / or speed to the lower limit frequency and / or speed.

[0111] Optionally, the energy-consuming components of the fixed-frequency air conditioner include multiple compressors and an indoor fan. The energy-saving mode output branch and the original mode output branch include multiple sets corresponding to multiple compressor contactors and the indoor fan. Optionally, the adjustment module 62 is also used to adjust the operating frequency and / or speed of the corresponding compressor and the speed of the indoor fan respectively through the inverter output in each of the energy-saving mode output branches in the energy-saving mode.

[0112] It should be noted that the structure provided in this application does not constitute a limitation on the energy-saving regulating device. Each module can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the controller in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the controller can call and execute the operations corresponding to each module. In other embodiments, the energy-saving regulating device may include more or fewer modules than those shown in the figures.

[0113] Please see Figure 7 In another aspect, this application provides an energy-saving regulation system, including a fixed-frequency appliance and an intelligent frequency converter connected between the mains power output and the fixed-frequency appliance; the intelligent frequency converter includes a memory, an energy-saving controller, and a mode switching circuit electrically connected to the energy-saving controller; the mode switching circuit includes an energy-saving mode output branch and an original mode output branch connected in parallel between the mains power output and the fixed-frequency appliance; the memory stores a computer program, and when the computer program is executed by the energy-saving controller, the energy-saving controller performs the energy-saving control method described in any embodiment of this application.

[0114] The fixed-frequency electrical appliances include multiple compressors and internal fans. The energy-saving mode output branch and the original mode output branch include multiple sets connected one-to-one with the compressors and the internal fans. Each energy-saving mode output branch connected to the compressor includes a reactor L1 / L2, a frequency converter 1# / 2#, and an energy-saving mode contactor KM1 / KM3 connected in series. The energy-saving mode output branch connected to the internal fan includes a frequency converter 3# and an energy-saving mode contactor KM5 connected in series. Each original mode output branch includes an original mode contactor KM2 / KM4 / KM6.

[0115] The intelligent frequency converter also includes a low-voltage circuit breaker QF1 / QF2 and an active filter APF connected between the mains power output and the mode switching circuit.

[0116] In another aspect, this application also provides a storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the energy-saving control method provided in any of the above embodiments of this application.

[0117] Those skilled in the art will understand that all or part of the processes in the methods provided in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0118] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for energy saving control of a fixed frequency appliance, applied to an intelligent frequency conversion device, characterized in that, The intelligent frequency conversion device comprises an energy-saving mode output branch and an original mode output branch connected in parallel between a power supply and a fixed-frequency electrical appliance, and the energy-saving control method comprises: After switching from the current working state to the enabled state of the energy-saving mode, the frequency converter in the energy-saving mode output branch is controlled to stop, and after waiting for a preset mode switching-in enabled time period, the energy-consuming component contactor of the fixed-frequency electrical appliance is sequentially controlled to be disconnected, the original mode output branch is controlled to be disconnected, and the energy-saving mode output branch is controlled to be turned on; According to the type of the current working state, a delay period is determined according to a delay strategy, wherein if the current working state is the disabled state of the energy-saving mode, a first delay period is determined according to the preset mode switching-in enabled time period according to a first delay strategy; if the current working state is the enabled state of the original mode, a second delay period is determined according to the preset mode switching-in enabled time period and a delay enabled time period according to a second delay strategy; After waiting for the corresponding delay period, the energy-consuming component contactor of the fixed-frequency electrical appliance is controlled to be closed, and the working frequency and / or rotating speed of the fixed-frequency electrical appliance are output by the frequency converter in the energy-saving mode output branch; The sequential control of the energy-consuming component contactor of the fixed-frequency electrical appliance being disconnected, the original mode output branch being disconnected, and the energy-saving mode output branch being turned on comprises: The energy-consuming component contactor of the fixed-frequency electrical appliance is controlled to be disconnected, and after waiting for a first time interval, the original mode output branch is controlled to be disconnected, and after waiting for a second time interval, the energy-saving mode output branch is controlled to be turned on; or The mode switching-in enabled time period is divided into multiple time intervals, and the energy-consuming component contactor of the fixed-frequency electrical appliance is sequentially controlled to be disconnected, the original mode output branch is sequentially controlled to be disconnected, and the energy-saving mode output branch is sequentially controlled to be turned on according to the corresponding time intervals.

2. The energy saving control method of claim 1, wherein, Further comprising: After switching from the enabled state of the energy-saving mode to the enabled state of the original mode, the energy-consuming component contactor of the fixed-frequency electrical appliance is sequentially controlled to be disconnected, the energy-saving mode output branch is sequentially controlled to be disconnected, and the original mode output branch is sequentially controlled to be turned on; After waiting for a preset mode switching-out time period, the energy-consuming component contactor of the fixed-frequency electrical appliance is controlled to be closed.

3. The energy saving control method of claim 2, wherein, After switching from the enabled state of the energy-saving mode to the enabled state of the original mode, further comprising: The frequency converter in the energy-saving mode output branch is controlled to stop, and after waiting for a preset mode switching-out time period, the step of sequentially controlling the energy-consuming component contactor of the fixed-frequency electrical appliance to be disconnected, the energy-saving mode output branch to be disconnected, and the original mode output branch to be turned on is performed.

4. The energy saving control method of claim 3, wherein, The sequential control of the energy-consuming component contactor of the fixed-frequency electrical appliance being disconnected, the energy-saving mode output branch being disconnected, and the original mode output branch being turned on comprises: The energy-consuming component contactor of the fixed-frequency electrical appliance is controlled to be disconnected, and after waiting for a first time interval, the energy-saving mode output branch is controlled to be disconnected, and after waiting for a second time interval, the original mode output branch is controlled to be turned on; or The mode switching-out time period is divided into multiple time intervals, and the energy-consuming component contactor of the fixed-frequency electrical appliance is sequentially controlled to be disconnected, the energy-saving mode output branch is sequentially controlled to be disconnected, and the original mode output branch is sequentially controlled to be turned on according to the corresponding time intervals.

5. The energy saving control method according to any one of claims 1 to 4, wherein, The fixed-frequency electrical appliance is a fixed-frequency air conditioner, the energy-consuming component contactor is a compressor contactor; the working frequency and / or rotating speed of the fixed-frequency electrical appliance is adjusted by the inverter output in the energy-saving mode output branch, including: According to the size of the current control temperature and the target temperature, if the current control temperature is greater than the target temperature, the working frequency and / or rotating speed of the fixed-frequency electrical appliance is increased by the inverter output in the energy-saving mode output branch; If the current control temperature is less than the target temperature, the working frequency and / or rotating speed of the fixed-frequency electrical appliance is reduced by the inverter output in the energy-saving mode output branch.

6. The energy saving control method of claim 5, wherein, The working frequency and / or rotating speed of the fixed-frequency electrical appliance is adjusted by the inverter output in the energy-saving mode output branch, further including: In the energy-saving mode, if the working frequency and / or rotating speed of the fixed-frequency electrical appliance is lower than the rated frequency and / or rotating speed for more than a set oil return period, a frequency increase and oil return control is performed, the working frequency of the fixed-frequency electrical appliance is controlled to increase and remain at a target oil return frequency, and / or the rotating speed is controlled to increase and remain at a target rotating speed for a preset time period, and then the control is exited.

7. The energy saving control method of claim 5, wherein, The working frequency and / or rotating speed of the fixed-frequency electrical appliance is adjusted by the inverter output in the energy-saving mode output branch, further including: According to the deviation of the preset working parameters of the fixed-frequency electrical appliance and / or the intelligent frequency conversion device from the corresponding reference parameter range, the current frequency reduction and / or speed reduction protection level is determined; wherein the preset working parameters include at least one of the following: inverter current, inverter temperature, compressor discharge temperature, and inner fan rotating speed; If the frequency reduction and / or speed reduction protection level is level one, the corresponding level protection scheme is to limit the frequency and / or rotating speed rising rate; If the frequency reduction and / or speed reduction protection level is level two, the corresponding level protection scheme is to limit the frequency and / or rotating speed; If the frequency reduction and / or speed reduction protection level is level three, the corresponding level protection scheme is to limit the working frequency and / or rotating speed to the lower limit frequency and / or lower limit rotating speed.

8. The energy saving control method of claim 5, wherein, The energy-consuming components of the fixed-frequency air conditioner include multiple compressors and an inner fan, and the energy-saving mode output branch and the original mode output branch include multiple groups corresponding to the multiple compressor contactors and the inner fan; The working frequency and / or rotating speed of the fixed-frequency electrical appliance is adjusted by the inverter output in the energy-saving mode output branch, including: In the energy-saving mode, the working frequency and / or rotating speed of the corresponding compressor and the rotating speed of the inner fan are respectively adjusted by the inverter output in each energy-saving mode output branch.

9. An energy saving control device, characterized by, including: The switching module is used to control the frequency converter in the energy-saving mode output branch to stop after switching from the current working state to the enabled state of the energy-saving mode, wait for a preset mode switching enabled time period, and sequentially control the energy-consuming component contactor of the fixed-frequency electric appliance to be disconnected, the original mode output branch of the intelligent frequency conversion device to be disconnected, and the energy-saving mode output branch to be conducted. The adjusting module is used to determine a delay period according to a type of the current working state according to a delay strategy, wherein if the current working state is the disabled state of the energy-saving mode, a first delay period is determined according to the preset mode switching enabled time period according to a first delay strategy; if the current working state is the enabled state of the original mode, a second delay period is determined according to the preset mode switching enabled time period and a delay enabled time period according to a second delay strategy; after waiting for the corresponding delay period, the energy-consuming component contactor of the fixed-frequency electric appliance is controlled to be closed, and the working frequency and / or rotating speed of the fixed-frequency electric appliance are adjusted through the frequency converter in the energy-saving mode output branch.

10. An energy saving regulation system, characterized by, The intelligent frequency conversion device comprises a memory, an energy-saving controller, and a mode switching circuit electrically connected to the energy-saving controller. The mode switching circuit comprises an energy-saving mode output branch and an original mode output branch connected in parallel between the commercial power output and the fixed-frequency electric appliance, the memory stores a computer program, and the computer program is executed by the energy-saving controller to enable the energy-saving controller to perform the energy-saving control method according to any one of claims 1 to 8.

11. The energy regulating system of claim 10, wherein, The fixed-frequency electric appliance comprises a plurality of compressors and an inner fan, and the energy-saving mode output branch and the original mode output branch comprise a plurality of groups corresponding to the compressors and the inner fan. Each energy-saving mode output branch corresponding to the compressor comprises an electric reactor, a frequency converter, and an energy-saving mode contactor connected in series. The energy-saving mode output branch corresponding to the inner fan comprises a frequency converter and an energy-saving mode contactor connected in series. Each original mode output branch comprises an original mode contactor.

12. The energy regulating system of claim 10, wherein, The intelligent frequency conversion device further comprises a low-voltage circuit breaker and an active filter connected between the commercial power output and the mode switching circuit.

13. A computer readable storage medium storing a computer program, wherein the computer program comprises program instructions configured to cause a processor to perform the method according to any one of claims 1 to 12. The computer program is executed by the processor to enable the processor to perform the energy-saving control method according to any one of claims 1 to 8.

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