Three-phase balancing device, control method, apparatus, and medium

Abstract

This application discloses a three-phase balancing device, control method, apparatus, and medium. The three-phase balancing device includes a first control switch, the input terminal of which is connected to a three-phase input power supply; a second control switch, the input terminal of which is connected to the output terminal of the first control switch; a first AC contactor, the input terminal of which is connected to the input terminal of the second control switch; an energy-saving device, the input terminal of which is connected to the output terminal of the first AC contactor; a third control switch, the input terminal of which is connected to the output terminal of the energy-saving device, and the output terminal of which is connected to an external load; and a second AC contactor, the input terminal of which is connected between the first and second control switches, and the output terminal of which is connected to the external load. This application enables dynamic three-phase balancing.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of three-phase balancing technology, and in particular to a three-phase balancing device, control method, apparatus, and medium. Background Technology

[0002] In power distribution networks, due to the widespread random connection of single-phase loads and the extensive use of nonlinear devices (such as frequency converters and rectifiers), problems such as three-phase voltage / current imbalance, low power factor, severe harmonic pollution, and operating voltage deviation from rated values ​​are common. These problems not only lead to increased line and transformer losses and excessive neutral current, but also cause decreased motor efficiency, increased heating, and shortened lifespan, resulting in huge energy waste. Summary of the Invention

[0003] This application provides a three-phase balancing device, control method, apparatus, and medium that can achieve dynamic three-phase balancing.

[0004] In a first aspect, embodiments of this application provide a three-phase balancing device, comprising: The first control switch, the input terminal of the first control switch is connected to the three-phase input power supply; A second control switch, the input terminal of which is connected to the output terminal of the first control switch; A first AC contactor, the input terminal of which is connected to the input terminal of the second control switch; An energy-saving device, wherein the input terminal of the energy-saving device is connected to the output terminal of the first AC contactor; The third control switch has its input terminal connected to the output terminal of the energy-saving device and its output terminal connected to an external load. The second AC contactor has its input terminal connected between the first control switch and the second control switch, and its output terminal connected to the external load. The control module is connected to the second control switch, the first AC contactor, the energy-saving device, the third control switch, and the second AC contactor respectively. The control module is used to adjust the energy-saving device according to the circuit parameters of the three-phase balancing equipment.

[0005] The three-phase balancing device according to the first aspect of this application has at least the following advantages: by connecting the energy-saving device between the first AC contactor and the external load, the three-phase current entering the external load is balanced. Furthermore, by connecting the external load via a third control switch, a power supply bypass is added, ensuring that power supply to the external load is maintained even when the energy-saving device is in a faulty state.

[0006] According to some embodiments of the first aspect of this application, the energy-saving device includes a first main coil, a second main coil, a third main coil, a first auxiliary coil, a second auxiliary coil, a third auxiliary coil, a first adjustable coil, a second adjustable coil, and a third adjustable coil. One end of the first main coil is connected to the first output terminal of the first AC contactor, and the other end of the first main coil is connected to one end of the first adjustable coil. The other end of the first adjustable coil is connected to the third control switch. The first auxiliary coil is coupled to both the first main coil and the first adjustable coil. One end of the second main coil is connected to the second output terminal of the first AC contactor, and the other end of the second main coil is connected to one end of the second adjustable coil. The other end of the second adjustable coil is connected to the third control switch. The second auxiliary coil is coupled to both the second main coil and the second adjustable coil. One end of the third main coil is connected to the third output terminal of the first AC contactor, and the other end of the third main coil is connected to one end of the third adjustable coil. The other end of the third adjustable coil is connected to the third control switch. The third auxiliary coil is coupled to both the third main coil and the third adjustable coil. The first secondary coil, the second secondary coil, and the third secondary coil are connected in series.

[0007] According to some embodiments of the first aspect of this application, the control module includes a processing unit, a data acquisition unit, and an adjustment unit. The processing unit is connected to the data acquisition unit and the adjustment unit respectively. The processing unit acquires the current information and voltage information of the three-phase balancing device through the data acquisition unit. The processing unit adjusts the first adjustable coil, the second adjustable coil, and the third adjustable coil through the adjustment unit based on the current information and the voltage information.

[0008] Secondly, embodiments of this application provide a control method based on a three-phase balancing device, applied to the three-phase balancing device described in the first aspect embodiment above, the control method comprising: Obtain the total active power, three-phase current imbalance, and power factor of the three-phase balancing device; The energy-saving device is adjusted based on the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor.

[0009] According to some embodiments of the second aspect of this application, the energy-saving device includes a plurality of adjustable coils, and adjusting the energy-saving device according to the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor includes: In response to the total active power being lower than a preset power threshold, the input voltage of the three-phase balancing device is obtained; If the total active power is lower than a preset power threshold and the input voltage is greater than a preset voltage threshold, adjust each of the adjustable coils.

[0010] According to some embodiments of the second aspect of this application, the energy-saving device includes a plurality of adjustable coils, and adjusting the energy-saving device according to the active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor includes: If the three-phase current imbalance exceeds a preset safety threshold, adjust each of the adjustable coils.

[0011] According to some embodiments of the second aspect of this application, the energy-saving device includes a plurality of adjustable coils. Adjusting the energy-saving device based on the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor includes: If the power factor is less than a preset threshold, adjust each of the adjustable coils.

[0012] Thirdly, embodiments of this application provide an operation control device for implementing the control method based on a three-phase balancing device as provided in the second aspect embodiment.

[0013] Fourthly, embodiments of this application provide a three-phase balancing device, including the operation control device provided in the third aspect of the embodiments above.

[0014] Fifthly, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the control method based on a three-phase balancing device as provided in the second aspect embodiment.

[0015] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of a three-phase balancing device provided in an embodiment of this application; Figure 2This is a schematic diagram of the structure of the energy-saving device provided in the embodiments of this application; Figure 3 A detailed flowchart of a control method based on a three-phase balancing device provided in this application embodiment; Figure 4 This is a schematic diagram of the structure of an operation control device provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0019] It is understandable that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, or the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0020] In power distribution networks, due to the widespread random connection of single-phase loads and the extensive use of nonlinear devices (such as frequency converters and rectifiers), problems such as three-phase voltage / current imbalance, low power factor, severe harmonic pollution, and operating voltage deviation from rated values ​​are common. These problems not only lead to increased line and transformer losses and excessive neutral current, but also cause decreased motor efficiency, increased heating, and shortened lifespan, resulting in huge energy waste.

[0021] Based on this, embodiments of this application provide a three-phase balancing device, control method, apparatus, and medium. By connecting the energy-saving device between a first AC contactor and an external load, the three-phase current entering the external load is balanced. Furthermore, by connecting the external load via a third control switch, a power supply bypass is added, ensuring that power supply to the external load is maintained even when the energy-saving device is in a faulty state.

[0022] Firstly, referring to Figure 1 , Figure 1 This is a schematic diagram of the structure of a three-phase balancing device provided in an embodiment of this application.

[0023] It is understood that the three-phase balancing equipment includes a first control switch, a second control switch, a first AC contactor, an energy-saving device, a third control switch, a second AC contactor, and a control module. The input terminal of the first control switch is connected to the three-phase input power supply, and the output terminal of the first control switch is connected to the input terminals of the second control switch and the second AC contactor, respectively. The energy-saving device is connected to the second control switch via the first AC contactor, and to an external load via the third control switch. The output terminal of the second AC contactor is connected to the external load. The control module is connected to the second control switch, the first AC contactor, the energy-saving device, the third control switch, and the second AC contactor, respectively. The control module is used to adjust the energy-saving device according to the circuit parameters of the three-phase balancing equipment. By connecting the energy-saving device between the first AC contactor and the external load, the three-phase current entering the external load is balanced. Furthermore, connecting the external load via the third control switch adds a power supply bypass, allowing power to be maintained to the external load even when the energy-saving device is faulty. Furthermore, the control module can acquire voltage signals before and after adjustment by the energy-saving device via the second and third control switches. The energy-saving device contains a current sensor, which the control module can use to acquire current information from the three-phase balancing equipment. The control module is connected to the first and second AC contactors. Under normal operating conditions of the energy-saving device, the control module can control the second AC contactor to turn off and the first AC contactor to turn on. In the event of a fault in the energy-saving device, the control module can control the second AC contactor to turn on and the first AC contactor to turn off, continuously supplying power to the external load via a bypass.

[0024] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of the energy-saving device provided in the embodiments of this application.

[0025] It is understood that the energy-saving device includes a first main coil 100, a second main coil 200, a third main coil 300, a first auxiliary coil 120, a second auxiliary coil 220, a third auxiliary coil 320, a first adjustable coil 110, a second adjustable coil 210, and a third adjustable coil 310. One end of the first main coil 100 is connected to the first output terminal of the first AC contactor, and the other end of the first main coil 100 is connected to one end of the first adjustable coil 110. The other end of the first adjustable coil 110 is connected to the third control switch. The first auxiliary coil 120 is coupled to both the first main coil 100 and the first adjustable coil 110. The second main coil 120... One end of the first main coil 200 is connected to the second output terminal of the first AC contactor. The other end of the second main coil 200 is connected to one end of the second adjustable coil 210. The other end of the second adjustable coil 210 is connected to the third control switch. The second auxiliary coil 220 is coupled to both the second main coil 200 and the second adjustable coil 210. One end of the third main coil 300 is connected to the third output terminal of the first AC contactor. The other end of the third main coil 300 is connected to one end of the third adjustable coil 310. The other end of the third adjustable coil 310 is connected to the third control switch. The third auxiliary coil 320 is coupled to both the third main coil 300 and the third adjustable coil 310. The first auxiliary coil 120, the second auxiliary coil 220, and the third auxiliary coil 320 are connected in series. The first adjustable coil 110 includes multiple first adjustment switches, each corresponding to a different number of coil turns. The output terminals of these switches are connected to a third control switch. The control module adjusts the number of coil turns in the circuit of the first adjustable coil 110 by controlling the on / off states of the different first adjustment switches, thereby adjusting the output voltage. The second adjustable coil 210 includes multiple second adjustment switches, each corresponding to a different number of coil turns. The output terminals of these switches are connected to a third control switch. The control module adjusts the number of coil turns in the circuit of the second adjustable coil 210 by controlling the on / off states of the different second adjustment switches, thereby adjusting the output voltage. The third adjustable coil 310 includes multiple third adjustment switches, each corresponding to a different number of coil turns. The output terminals of these switches are connected to a third control switch. The control module adjusts the number of coil turns in the circuit of the third adjustable coil 310 by controlling the on / off states of the different third adjustment switches, thereby adjusting the output voltage.

[0026] It should be noted that the control module includes a processing unit, a data acquisition unit, and an adjustment unit. The processing unit is connected to the data acquisition unit and the adjustment unit respectively. The processing unit obtains the current and voltage information of the three-phase balancing device through the data acquisition unit. Based on the current and voltage information, the processing unit adjusts the first adjustable coil 110, the second adjustable coil 210, and the third adjustable coil 310 through the adjustment unit.

[0027] Secondly, referring to Figure 3 , Figure 3 A detailed flowchart of a control method based on a three-phase balancing device provided in this application embodiment is applied to, for example... Figure 1 and Figure 2 The three-phase balancing device shown includes, but is not limited to, the following steps: Step S100: Obtain the total active power, three-phase current imbalance, and power factor of the three-phase balancing equipment; Step S200: Adjust the energy-saving device according to the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor.

[0028] Understandably, during the operation of a three-phase balancing device, the control module can acquire the total active power, three-phase current imbalance, and power factor to determine whether energy-saving equipment adjustments are needed, thereby achieving three-phase balance. The total active power is the sum of the three-phase power, and the three-phase current imbalance is calculated from the difference between the maximum and minimum phase currents and the average phase current. For example, if the total active power is lower than a preset power threshold, it indicates the circuit is under low load. In this case, the input voltage of the three-phase balancing device can be acquired. If the input voltage is greater than a preset voltage threshold, it indicates the input voltage is greater than the voltage required by the external load. To improve energy utilization efficiency, the control module can adjust the number of turns in each adjustable coil to reduce the operating voltage input to the external load. The preset voltage threshold can be adjusted according to different external loads. As another example, if the three-phase current imbalance is greater than a preset safety threshold, it indicates the circuit is unbalanced. In this case, the control module can first analyze the deviation of each phase voltage, and then adjust the number of turns in each adjustable coil based on the deviation, adjusting the equivalent impedance of each phase in the magnetic balance circuit. For example, if the power factor is less than a preset threshold, the control module can adjust each adjustable coil, thereby adjusting the number of turns of each adjustable coil, changing the capacitive characteristics of each coil, and thus improving the power factor.

[0029] Thirdly, referring to Figure 4 This application provides an operation control device 400, including a memory 410, a processor 420, and a computer program stored in the memory 410 and executable on the processor 420. The processor 420 executes the program to implement the control method based on a three-phase balancing device as described in the second aspect embodiment above, for example, executing... Figure 3 Method steps S100 to S200.

[0030] The memory 410, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs, including the control method based on a three-phase balancing device in the above embodiments of this application. The processor 420 implements the control method based on a three-phase balancing device in the above embodiments of this application by running the non-transitory software program and instructions stored in the memory 410.

[0031] The memory 410 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data required for executing the control method based on the three-phase balancing device in the above embodiments. Furthermore, the memory 410 may include a high-speed random access memory 410, and may also include non-transitory memory 410, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. It should be noted that the memory 410 may include remotely located memories 410 relative to the processor 420, and these remote memories 410 can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0032] Fourthly, embodiments of this application provide a three-phase balancing device, which includes an operation control device 400 as described in the third aspect embodiment. This device balances the three-phase current entering the external load by connecting an energy-saving device between a first AC contactor and an external load. Furthermore, by connecting the external load via a third control switch, a power supply bypass is added, ensuring power supply to the external load is maintained even when the energy-saving device is faulty.

[0033] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the control method based on a three-phase balancing device as described in the second aspect embodiment above, for example, executing... Figure 3Method steps S100 to S200 are described above. Those skilled in the art will understand that all or some of the steps in the methods disclosed above, and the system, can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all physical components can be implemented as processors, such as central processing units, digital signal processors, or microprocessors executing software, or as hardware, or as integrated circuits, such as application-specific integrated circuits. Such software can be distributed on a computer-readable medium, which can include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information transmission medium.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A three-phase balancing device, characterized in that, include: The first control switch, the input terminal of the first control switch is connected to the three-phase input power supply; A second control switch, the input terminal of which is connected to the output terminal of the first control switch; A first AC contactor, the input terminal of which is connected to the input terminal of the second control switch; An energy-saving device, wherein the input terminal of the energy-saving device is connected to the output terminal of the first AC contactor; The third control switch has its input terminal connected to the output terminal of the energy-saving device and its output terminal connected to an external load. The second AC contactor has its input terminal connected between the first control switch and the second control switch, and its output terminal connected to the external load. The control module is connected to the second control switch, the first AC contactor, the energy-saving device, the third control switch, and the second AC contactor respectively. The control module is used to adjust the energy-saving device according to the circuit parameters of the three-phase balancing equipment.

2. The three-phase balancing device of claim 1, wherein, The energy-saving device includes a first main coil, a second main coil, a third main coil, a first auxiliary coil, a second auxiliary coil, a third auxiliary coil, a first adjustable coil, a second adjustable coil, and a third adjustable coil. One end of the first main coil is connected to the first output terminal of the first AC contactor, and the other end of the first main coil is connected to one end of the first adjustable coil. The other end of the first adjustable coil is connected to the third control switch. The first auxiliary coil is coupled to both the first main coil and the first adjustable coil. One end of the second main coil is connected to the second output terminal of the first AC contactor, and the other end of the second main coil is connected to one end of the second adjustable coil. The other end of the second adjustable coil is connected to the third control switch. The second auxiliary coil is coupled to both the second main coil and the second adjustable coil. One end of the third main coil is connected to the third output terminal of the first AC contactor, and the other end of the third main coil is connected to one end of the third adjustable coil. The other end of the third adjustable coil is connected to the third control switch. The third auxiliary coil is coupled to both the third main coil and the third adjustable coil. The first secondary coil, the second secondary coil, and the third secondary coil are connected in series.

3. The three-phase balancing device of claim 2, wherein, The control module includes a processing unit, a data acquisition unit, and an adjustment unit. The processing unit is connected to the data acquisition unit and the adjustment unit respectively. The processing unit acquires the current and voltage information of the three-phase balancing device through the data acquisition unit. Based on the current and voltage information, the processing unit adjusts the first adjustable coil, the second adjustable coil, and the third adjustable coil through the adjustment unit.

4. A control method based on a three-phase balancing device, characterized in that, The control method, applied to a three-phase balancing device as described in any one of claims 1 to 3, comprises: Obtain the total active power, three-phase current imbalance, and power factor of the three-phase balancing device; The energy-saving device is adjusted based on the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor.

5. The control method according to claim 4, characterized in that, The energy-saving device includes multiple adjustable coils. Adjusting the energy-saving device based on the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor includes: In response to the total active power being lower than a preset power threshold, the input voltage of the three-phase balancing device is obtained; If the total active power is lower than a preset power threshold and the input voltage is greater than a preset voltage threshold, adjust each of the adjustable coils.

6. The control method according to claim 4, characterized in that, The energy-saving device includes multiple adjustable coils. Adjusting the energy-saving device based on the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor includes: If the three-phase current imbalance exceeds a preset safety threshold, adjust each of the adjustable coils.

7. The control method according to claim 4, characterized in that, The energy-saving device includes multiple adjustable coils. Adjusting the energy-saving device based on the total active power of the three-phase balancing equipment, the three-phase current imbalance, and the power factor includes: If the power factor is less than a preset threshold, adjust each of the adjustable coils.

8. An operation control device, characterized in that, The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the control method based on a three-phase balancing device as described in any one of claims 4 to 7.

9. A three-phase balancing device, characterized in that, Includes the operation control device as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the control method based on a three-phase balancing device as described in any one of claims 4 to 7.

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