Voltage balancing device capable of customizing intelligent power output and alternating-current low-voltage power distribution system

Abstract

The invention is mainly applied to the technical field of power systems and transformers. The invention discloses a voltage balancing device for customizing electric power intelligent output and an alternating-current low-voltage power distribution system, which are used for outputting adjusted phase voltage signals, the device comprises a plurality of voltage balancing units, each voltage balancing unit comprises two coil groups, the two coil groups share the same magnetic circuit, and the voltage balancing units are connected with the same magnetic circuit. The electromagnetic interaction between the two coil groups is utilized to automatically adjust the current and the voltage, so that the output voltage is kept balanced. The voltage balance in the power system can be ensured by adjusting the voltage, and meanwhile, the cost is reduced by simplifying the device structure.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems and transformers, and in particular to a voltage balancing device for customized power intelligent output and an AC low-voltage power distribution system. Background Art

[0002] In modern power systems, three-phase voltage balancers play a vital role. They ensure voltage balance by real-time monitoring and adjusting the voltage difference between the three-phase power sources, thereby preventing a variety of problems caused by three-phase imbalance. These problems include unstable load voltage, increased reactive power loss, reduced power factor, equipment overheating, and system instability. However, existing three-phase voltage balancers have limitations such as slow response speed, limited adjustment range, or high cost. Therefore, it is of great value to develop a new voltage regulator solution that can quickly and efficiently achieve voltage balance within a wider range of voltage fluctuations. Summary of the invention

[0003] The present invention provides a voltage balancing device with customized power intelligent output and an AC low-voltage power distribution system, which can ensure voltage balance in a power system by adjusting the voltage and reduce costs by simplifying the device structure.

[0004] The present invention provides a voltage balancing device for customized power intelligent output, the device is used to adjust a multi-phase voltage signal, the device comprises a plurality of voltage balancing units, and the input end of each of the voltage balancing units is used to input a phase voltage signal in the multi-phase voltage signal; Each of the voltage balancing units includes a first coil group and a second coil group, wherein the first coil group and the second coil group are arranged in the same magnetic circuit; The input end of the first coil group of the current voltage balancing unit is used as the input end of the current voltage balancing unit, and the output end of the first coil group of the current voltage balancing unit is connected to the input end of the second coil group of the next voltage balancing unit; The input end of the second coil group of the current voltage balancing unit is connected to the output end of the first coil group of the previous voltage balancing unit, and the output end of the second coil group of the current voltage balancing unit serves as the output end of the current voltage balancing unit and is used to output the adjusted phase voltage signal.

[0005] Further, each of the second coil groups includes a first coil and a second coil; One end of the first coil serves as an input end of the second coil group, the other end of the first coil serves as an output end of the second coil group, and one end of the second coil is connected to the other end of the first coil.

[0006] Furthermore, the device also includes a magnetic core, and the magnetic core includes a plurality of magnetic core columns; For each of the magnetic core columns, the coils of the first coil group and the second coil group of the voltage balancing unit are both wound on the surface of the magnetic core column corresponding to the voltage balancing unit.

[0007] Furthermore, the device further comprises a first magnetic core column, a second magnetic core column and a third magnetic core column, one ends of the first magnetic core column, the second magnetic core column and the third magnetic core column are connected to each other, and the other ends of the first magnetic core column, the second magnetic core column and the third magnetic core column are connected to each other; The surfaces of the first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with coils of the first coil group and the second coil group of the voltage balancing unit; The first coil group on the first magnetic core column is connected to the second coil group on the second magnetic core column, the second coil group on the first magnetic core column is connected to the first coil group on the third magnetic core column, and the first coil group on the second magnetic core column is connected to the second coil group on the third magnetic core column.

[0008] Further, the device also includes a plurality of third coil groups; Each coil of the third coil group is wound around a surface of a target magnetic core main body among the plurality of magnetic core columns.

[0009] Further, the first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with a third coil group; Each of the third coil groups is connected in parallel with the capacitor unit.

[0010] The present invention also provides an AC low-voltage power distribution system, which includes at least one voltage balancing device for customized power intelligent output as described above and a transformer, and each of the voltage balancing devices is connected in series with the transformer.

[0011] Furthermore, the system further comprises a first switch unit; The input end of the voltage balancing device is connected to the transformer, and the output end of the voltage balancing device is connected to the first switch unit; When the first switch unit is in the on state, the multi-phase voltage signal is input to the voltage balancing device, and the voltage balancing device adjusts the multi-phase voltage signal and then outputs the voltage-balanced multi-phase voltage signal through the first switch unit; When the first switch unit is in an off state, the multi-phase voltage signal is input to the first switch unit and then output.

[0012] Furthermore, the system further comprises a second switch unit; The input end of the voltage balancing device is connected to the transformer, and the output end of the voltage balancing device is connected to the second switch unit; When the second switch unit is in the first state, the multi-phase voltage signal is input to the voltage balancing device, and the multi-phase voltage signal is adjusted by the voltage balancing device and then outputted through the second switch unit as a voltage-balanced multi-phase voltage signal; When the second switch unit is in the second state, the multi-phase voltage signal is input to the second switch unit and then output; When the second switch unit is in the third state, the circuits through which the multi-phase voltage signal is input to the voltage balancing device and the second switch unit are both in an open circuit state.

[0013] The present invention also provides an AC low-voltage power distribution system, the system comprising a first voltage balancing device, a second voltage balancing device, a switch module and a transformer module, the first voltage balancing device and the second voltage balancing device are both voltage balancing devices for customized power intelligent output as described above; The input end of the first voltage balancing device is used to input a first multi-phase voltage signal, and the output end of the first voltage balancing device is connected to the transformer module through the switch module; The input end of the second voltage balancing device is used to input a second multi-phase voltage signal, and the output end of the first voltage balancing device is connected to the transformer module through the switch module.

[0014] The present invention has at least the following beneficial effects: In the scheme of the present application, the first coil group and the second coil group of each voltage balancing unit share the same magnetic circuit, and the magnetic flux generated by the coupling of the first coil group and the second coil group intersects with each other. When the unbalanced voltage and current pass through the voltage balancing device of the present application, the first coil group and the second coil group present different degrees of magnetic saturation, and the coil group with a higher voltage will naturally absorb more inductive reactive power. By utilizing the mechanism that the magnetic potential inside the magnetic circuit always tends to a relatively balanced state, through electromagnetic interaction and conversion, the reverse excess current between the first coil group and the second coil group is resisted, and finally the phase voltage output by the intersection of the second coil group is relatively balanced. In addition, since there is no need to set up a separate magnetic circuit for each coil group, the design of a shared magnetic circuit reduces material costs and manufacturing complexity, while also reducing the volume and weight of the device, which helps to reduce overall costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0016] Figure 1 is a structural schematic diagram of a voltage balancing device for customized power intelligent output of this embodiment; Figure 2 is a circuit schematic diagram of a voltage balancing device applicable to a three-phase power supply of this embodiment; Figure 3 is a circuit schematic diagram of the third coil group in the voltage balancing device applicable to a three-phase power supply of this embodiment; Figure 4 is a schematic structural diagram of a voltage balancing device applicable to a three-phase power supply according to the present embodiment; Figure 5 is a schematic structural diagram of the AC low-voltage power distribution system of this embodiment; Figure 6 is a schematic diagram of a first switch unit in a conducting state in the AC low-voltage power distribution system of this embodiment; Figure 7 is a schematic diagram of a first switch unit in an off state in the AC low-voltage power distribution system of this embodiment; Figure 8 is a schematic diagram of a second switch unit in a first state in the AC low-voltage power distribution system of this embodiment; Fig. 9 is a schematic diagram of the second switch unit in the AC low-voltage power distribution system of this embodiment being in a second state; Fig.10 is a schematic diagram of the second switch unit in the AC low-voltage power distribution system of this embodiment being in a third state; Among them, 100 is a voltage balancing device; 110 is a voltage balancing unit; 111 is a first coil group; 112 is a second coil group. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] In the power distribution system, three-phase unbalance is a common problem, which can lead to voltage instability, increased reactive power loss, reduced power factor, equipment overheating, and system instability. In order to solve these problems, three-phase unbalance regulation technology came into being, which achieves system balance by installing balancers in the unbalanced circuit. These balancers can be capacitors, inductors, or transformers, etc. They monitor and adjust the voltage between the three-phase power supply to ensure that the voltage of each phase is equal, thereby maintaining three-phase balance.

[0019] The main function of a three-phase voltage balancer is to prevent equipment damage and efficiency loss caused by three-phase imbalance, and to protect the stability and safety of the power system. In some cases, the balancer also has an automatic adjustment function, which can automatically adjust when an imbalance is detected to maintain the stable operation of the system. In addition, installing automatic regulators and phase sequence protectors is also a common application method. They can monitor system imbalance and automatically adjust, as well as cut off power supply when the phase sequence is wrong to protect equipment from damage.

[0020] However, the application of three-phase voltage balancers also faces some challenges. First, high-quality balancers are expensive, especially when applied on a large scale, the initial investment cost is significant. Second, some balancers require regular maintenance and calibration, which increases the complexity and cost of operation and maintenance. In addition, some types of balancers may introduce additional energy losses, reduce system efficiency, and may have limited response speed under rapidly changing load conditions. Compatibility issues, installation restrictions, and reliance on balancer reliability are also factors that need to be considered in practical applications. In order to solve the above problems, the present application provides the following embodiments.

[0021] Please refer to Figure 1 , Figure 1 It is a structural schematic diagram of the voltage balancing device for customized power intelligent output of this embodiment.

[0022] The present embodiment provides a voltage balancing device 100 for customized intelligent power output, which is used to adjust a multi-phase voltage signal. The device includes multiple voltage balancing units 110, and the input end of each voltage balancing unit 110 is used to input a phase voltage signal in the multi-phase voltage signal; each voltage balancing unit 110 includes a first coil group 111 and a second coil group 112, and the first coil group 111 and the second coil group 112 are arranged in the same magnetic circuit; the input end of the first coil group 111 of the current voltage balancing unit 110 serves as the input end of the current voltage balancing unit 110, and the output end of the first coil group 111 of the current voltage balancing unit 110 is connected to the input end of the second coil group 112 of the next voltage balancing unit 110; the input end of the second coil group 112 of the current voltage balancing unit 110 is connected to the output end of the first coil group 111 of the previous voltage balancing unit 110, and the output end of the second coil group 112 of the current voltage balancing unit 110 serves as the output end of the current voltage balancing unit 110 and is used to output the adjusted phase voltage signal.

[0023] In some embodiments, each second coil group 112 includes a first coil and a second coil; one end of the first coil serves as an input end of the second coil group 112, the other end of the first coil serves as an output end of the second coil group 112, and one end of the second coil is connected to the other end of the first coil.

[0024] In this embodiment, the first coil group 111 and the second coil group 112 of each voltage balancing unit 110 share the same magnetic circuit, and the magnetic flux generated by the coupling of the first coil group 111 and the second coil group 112 intersects with each other. When the unbalanced voltage and current pass through the voltage balancing device 100 of the present application, the first coil group 111 and the second coil group 112 present different magnetic saturation levels, and the coil group with a higher voltage will naturally absorb more inductive reactive power. By utilizing the mechanism that the magnetic potential inside the magnetic circuit always tends to a relatively balanced state, through electromagnetic interaction and conversion, the reverse excess current between the first coil group 111 and the second coil group 112 is resisted, and finally the phase voltage output by the intersection of the second coil group 112 is relatively balanced. In addition, since there is no need to set a separate magnetic circuit for each coil group, the design of the shared magnetic circuit reduces material cost and manufacturing complexity, and also reduces the volume and weight of the device, which helps to reduce the overall cost.

[0025] Please refer to Figure 2 , Figure 2 4 is a circuit diagram of a voltage balancing device applicable to a three-phase power supply according to the present embodiment.

[0026] The circuit is a three-phase transformer circuit with a filtering function. The three-phase voltage signal is input to the first coil group and the second coil group, and voltage conversion is achieved through the two coil groups. The voltage balancing device of this embodiment also has the function of a low-pass filter, which can filter out noise signals of different frequencies.

[0027] In some embodiments, the voltage balancing device further includes a magnetic core including a plurality of magnetic core columns; for each magnetic core column, the coils of the first coil group and the second coil group of the voltage balancing unit are both wound on the surface of the magnetic core column corresponding to the voltage balancing unit.

[0028] In some embodiments, the voltage balancing device further includes a plurality of third coil groups; the coils of each third coil group are wound around the surface of a target magnetic core body among the plurality of magnetic core columns.

[0029] In some embodiments, each third coil set is connected in parallel with a capacitor.

[0030] Please refer to Figure 3 , Figure 3 This is a circuit schematic diagram of the third coil group in the voltage balancing device for three-phase power supply of this embodiment. The three-phase power supply adjusts the voltage level and performs filtering through the third coil group to ensure the stability and purity of the output voltage.

[0031] In some embodiments, the voltage balancing device also includes a first magnetic core column, a second magnetic core column and a third magnetic core column, one ends of the first magnetic core column, the second magnetic core column and the third magnetic core column are interconnected, and the other ends of the first magnetic core column, the second magnetic core column and the third magnetic core column are interconnected; the surfaces of the first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with coils of the first coil group and the second coil group of the voltage balancing unit; the first coil group on the first magnetic core column is connected to the second coil group on the second magnetic core column, the second coil group on the first magnetic core column is connected to the first coil group on the third magnetic core column, and the first coil group on the second magnetic core column is connected to the second coil group on the third magnetic core column.

[0032] In some embodiments, the first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with a third coil group; each third coil group is connected in parallel with the capacitor unit.

[0033] Please refer to Figure 4 , Figure 4 4 is a schematic diagram of the structure of a voltage balancing device applicable to a three-phase power supply according to the present embodiment.

[0034] After the voltage balancing device is connected in series to the main power supply circuit of the power system, when the voltage and current from the input end pass through the voltage balancing device, the preset gear of the voltage balancing device reduces the voltage to leave room for adjusting the power, and the first coil group and the second coil group generate magnetic force on the voltage and current coupling magnetic core passing through. Since the two coil groups are respectively wound on two different core columns of the same three-column iron core, the magnetic flux generated by the coupling of the first coil group and the second coil group intersects with each other. When the unbalanced voltage and current pass through the device, the two coil groups show different degrees of magnetic saturation, and the coil group with higher voltage will naturally absorb more inductive reactive power. The voltage balancing device uses the mechanism that the magnetic potential inside its iron core always tends to a relatively balanced state, and uses electromagnetic interaction and conversion to resist the reverse excess current between the two coil groups. Finally, the voltage is output through the intersection of the first coil and the second coil in the second coil group. At this moment, the output phase voltage is relatively balanced.

[0035] In addition, the function of the third coil group is to strengthen the reactance of the first coil group and the second coil group, suppress voltage harmonics and improve the power factor, and form mutual inductance with the first coil group and the second coil group. Due to the effect of mutual inductance, the magnetic potential balance of the device becomes more interconnected.

[0036] It can be understood that the voltage balancing device is usually connected in series to the main power supply circuit of the power system, which can centrally control and manage the input power of the load system in all directions and improve the power quality. The voltage balancing device is like an inductive device, but its special structure makes its working characteristics capacitive. Improving the system power factor with such technology will not change the inductive nature of the load, but only reduce the inductive nature of the load, that is, it will not reduce the power factor of the load system, but on the contrary, it will help to improve the power factor of the load system.

[0037] Please refer to Figure 5 , Figure 5 Schematic diagram of the structure of the AC low-voltage power distribution system of this embodiment.

[0038] An AC low-voltage power distribution system, the system includes a first voltage balancing device, a second voltage balancing device, a switch module and a transformer module, the first voltage balancing device and the second voltage balancing device are both voltage balancing devices with customized power intelligent output as in any of the above embodiments; the input end of the first voltage balancing device is used to input a first multi-phase voltage signal, and the output end of the first voltage balancing device is connected to the transformer module through the switch module; the input end of the second voltage balancing device is used to input a second multi-phase voltage signal, and the output end of the first voltage balancing device is connected to the transformer module through the switch module.

[0039] It can be understood that when the capacity of the voltage balancing device is greater than or equal to the capacity of the transformer, it is directly connected in series to the secondary side of the transformer.

[0040] This embodiment also provides an AC low-voltage power distribution system, which includes at least one voltage balancing device with customized power intelligent output as in any of the above embodiments and a transformer, and each voltage balancing device is connected in series with the transformer.

[0041] It can be understood that when the capacity of the voltage balancing device is smaller than the capacity of the transformer or the load increases, a bypass is added to put the voltage balancing device in a flat-road condition.

[0042] In some embodiments, the AC low-voltage power distribution system also includes a first switch unit; the input end of the voltage balancing device is connected to the transformer, and the output end of the voltage balancing device is connected to the first switch unit; when the first switch unit is in an on state, a multi-phase voltage signal is input to the voltage balancing device, and the multi-phase voltage signal is adjusted by the voltage balancing device and then output through the first switch unit to obtain a voltage-balanced multi-phase voltage signal; when the first switch unit is in an off state, the multi-phase voltage signal is input to the first switch unit and then output.

[0043] Please refer to Figure 6 , Figure 6 It is a schematic diagram showing that the first switch unit is in a conducting state when the first switch unit is connected to the voltage balancing device in the AC low-voltage power distribution system of this embodiment.

[0044] The first switch unit includes a first switch and a second switch. The input voltage signal is input to the voltage balancing device from the closed first switch and then the balanced voltage signal adjusted by the voltage balancing device is output through the closed second switch.

[0045] Please refer to Figure 7 , Figure 7 It is a schematic diagram showing that the first switch unit is in an off state when the first switch unit is connected to the voltage balancing device in the AC low-voltage power distribution system of this embodiment.

[0046] After the first switch is turned off, the voltage balancing device is in a short-circuit state, and the input voltage signal is output through the closed second switch.

[0047] In some embodiments, the AC low-voltage power distribution system also includes a second switch unit; the input end of the voltage balancing device is connected to the transformer, and the output end of the voltage balancing device is connected to the second switch unit; when the second switch unit is in a first state, a multi-phase voltage signal is input to the voltage balancing device, and the multi-phase voltage signal is adjusted by the voltage balancing device and then output through the second switch unit to achieve voltage-balanced multi-phase voltage signal; when the second switch unit is in a second state, the multi-phase voltage signal is input to the second switch unit and then output; when the second switch unit is in a third state, the circuits of the multi-phase voltage signal input to the voltage balancing device and the second switch unit are both in an open state.

[0048] Please refer to Figures 8 to 10 , the second switch unit includes a third switch and a fourth switch. When the second switch unit is in the first state, the input voltage signal is input from the closed third switch to the voltage balancing device, and then the balanced voltage signal adjusted by the voltage balancing device is output through the closed fourth switch; when the second switch unit is in the second state, the third switch is turned off, the voltage balancing device is in a short-circuit state, and the input voltage signal is output through the closed fourth switch; when the second switch unit is in the third state, the third switch is turned off, the fourth switch is turned off, the voltage balancing device is in a stopped working state, and the input power supply is cut off.

[0049] In the AC low-voltage power distribution system provided by the above-mentioned embodiment, the first coil group and the second coil group of each voltage balancing unit share the same magnetic circuit, and the magnetic flux generated by the coupling of the first coil group and the second coil group intersects with each other. When the unbalanced voltage and current pass through the voltage balancing device of the present application, the first coil group and the second coil group present different degrees of magnetic saturation, and the coil group with a higher voltage will naturally absorb more inductive reactive power. By utilizing the mechanism that the magnetic potential inside the magnetic circuit always tends to a relatively balanced state, through electromagnetic interaction and conversion, the reverse excess current between the first coil group and the second coil group is resisted, and finally the phase voltage output by the intersection of the second coil group is relatively balanced. In addition, since there is no need to set up a separate magnetic circuit for each coil group, the design of a shared magnetic circuit reduces material costs and manufacturing complexity, and also reduces the volume and weight of the device, which helps to reduce overall costs.

[0050] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, device, device, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, devices, products or devices. It should be understood that in the present application, "at least one (item)" refers to one or more, and "a plurality" refers to two or more.

[0051] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0052] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0053] Although the description of the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached claims, taking into account the prior art, so as to effectively cover the intended scope of the present application. In addition, the above description of the present application is based on the embodiments foreseeable by the inventor, and its purpose is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. A voltage balancing device for customized power intelligent output, characterized in that: The device is used to adjust a multi-phase voltage signal, and the device includes a plurality of voltage balancing units, and an input end of each of the voltage balancing units is used to input a phase voltage signal in the multi-phase voltage signal; Each of the voltage balancing units includes a first coil group and a second coil group, wherein the first coil group and the second coil group are arranged in the same magnetic circuit; The input end of the first coil group of the current voltage balancing unit is used as the input end of the current voltage balancing unit, and the output end of the first coil group of the current voltage balancing unit is connected to the input end of the second coil group of the next voltage balancing unit; The input end of the second coil group of the current voltage balancing unit is connected to the output end of the first coil group of the previous voltage balancing unit, and the output end of the second coil group of the current voltage balancing unit serves as the output end of the current voltage balancing unit and is used to output the adjusted phase voltage signal.

2. The voltage balancing device for customized power intelligent output according to claim 1, characterized in that: Each of the second coil groups includes a first coil and a second coil; One end of the first coil serves as an input end of the second coil group, the other end of the first coil serves as an output end of the second coil group, and one end of the second coil is connected to the other end of the first coil.

3. The voltage balancing device for customized power intelligent output according to claim 2, characterized in that: The device also includes a magnetic core, wherein the magnetic core includes a plurality of magnetic core columns; For each of the magnetic core columns, the coils of the first coil group and the second coil group of the voltage balancing unit are both wound on the surface of the magnetic core column corresponding to the voltage balancing unit.

4. The voltage balancing device for customized power intelligent output according to claim 2, characterized in that: The device further comprises a first magnetic core column, a second magnetic core column and a third magnetic core column, wherein one ends of the first magnetic core column, the second magnetic core column and the third magnetic core column are connected to each other, and the other ends of the first magnetic core column, the second magnetic core column and the third magnetic core column are connected to each other; The surfaces of the first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with coils of the first coil group and the second coil group of the voltage balancing unit; The first coil group on the first magnetic core column is connected to the second coil group on the second magnetic core column, the second coil group on the first magnetic core column is connected to the first coil group on the third magnetic core column, and the first coil group on the second magnetic core column is connected to the second coil group on the third magnetic core column.

5. The voltage balancing device for customized power intelligent output according to claim 1, characterized in that: The apparatus further comprises a plurality of third coil assemblies; Each coil of the third coil group is wound around a surface of a target magnetic core column among the plurality of magnetic core columns.

6. The voltage balancing device for customized power intelligent output according to claim 4, characterized in that: The first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with a third coil group; Each of the third coil groups is connected in parallel with the capacitor unit.

7. An AC low voltage power distribution system, characterized in that: The system comprises at least one voltage balancing device for customized power intelligent output as claimed in any one of claims 1 to 6 and a transformer, and each of the voltage balancing devices is connected in series with the transformer.

8. The AC low voltage power distribution system according to claim 7, characterized in that: The system further comprises a first switch unit; The input end of the voltage balancing device is connected to the transformer, and the output end of the voltage balancing device is connected to the first switch unit; When the first switch unit is in the on state, the multi-phase voltage signal is input to the voltage balancing device, and the voltage balancing device adjusts the multi-phase voltage signal and then outputs the voltage-balanced multi-phase voltage signal through the first switch unit; When the first switch unit is in an off state, the multi-phase voltage signal is input to the first switch unit and then output.

9. The AC low voltage power distribution system according to claim 7, characterized in that: The system further comprises a second switch unit; The input end of the voltage balancing device is connected to the transformer, and the output end of the voltage balancing device is connected to the second switch unit; When the second switch unit is in the first state, the multi-phase voltage signal is input to the voltage balancing device, and the multi-phase voltage signal is adjusted by the voltage balancing device and then outputted through the second switch unit as a voltage-balanced multi-phase voltage signal; When the second switch unit is in the second state, the multi-phase voltage signal is input to the second switch unit and then output; When the second switch unit is in the third state, the circuits through which the multi-phase voltage signal is input to the voltage balancing device and the second switch unit are both in an open circuit state.

10. An AC low voltage power distribution system, characterized in that: The system comprises a first voltage balancing device, a second voltage balancing device, a switch module and a transformer module, wherein the first voltage balancing device and the second voltage balancing device are both voltage balancing devices for customized power intelligent output as claimed in any one of claims 1 to 6; The input end of the first voltage balancing device is used to input a first multi-phase voltage signal, and the output end of the first voltage balancing device is connected to the transformer module through the switch module; The input end of the second voltage balancing device is used to input a second multi-phase voltage signal, and the output end of the first voltage balancing device is connected to the transformer module through the switch module.

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