Customized voltage balancing device and AC low-voltage distribution system for intelligent power output

Abstract

The present invention is primarily used in the fields of power systems and transformer technology. Disclosed are a voltage balancing device and AC low-voltage power distribution system with customized intelligent power output, which are used to output adjusted phase voltage signals. The device includes multiple voltage balancing units, each of which includes two coil groups that share the same magnetic circuit. The electromagnetic interaction between the two coil groups automatically adjusts the current and voltage to maintain a balanced output voltage. This application can ensure voltage balance in a power system by adjusting the voltage, while reducing costs 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 with customized intelligent power output and an AC low-voltage power distribution system. Background Art

[0002] Three-phase voltage balancers play a vital role in modern power systems. They ensure voltage balance by monitoring and adjusting the voltage differences between the three phases in real time, 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 suffer from slow response speeds, limited adjustment ranges, and high costs. Therefore, it is of great value to develop a new voltage regulator solution that can quickly and efficiently achieve voltage balance over a wider range of voltage fluctuations. Summary of the Invention

[0003] The present invention provides a voltage balancing device with customized intelligent power output and an AC low-voltage power distribution system, which can ensure voltage balance in the 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 includes 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 of the multi-phase voltage signal;

[0005] 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;

[0006] The input end of the first coil group of the current voltage balancing unit serves 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;

[0007] 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.

[0008] Further, each of the second coil groups includes a first coil and a second coil;

[0009] 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.

[0010] Furthermore, the device further comprises a magnetic core, wherein the magnetic core comprises a plurality of magnetic core columns;

[0011] 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.

[0012] Furthermore, the device further includes 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;

[0013] 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;

[0014] The first coil group on the first magnetic core leg is connected to the second coil group on the second magnetic core leg, the second coil group on the first magnetic core leg is connected to the first coil group on the third magnetic core leg, and the first coil group on the second magnetic core leg is connected to the second coil group on the third magnetic core leg.

[0015] Furthermore, the device further comprises a plurality of third coil groups;

[0016] Each coil of the third coil group is wound around a surface of a target magnetic core main among the plurality of magnetic core legs.

[0017] Furthermore, the first magnetic core column, the second magnetic core column and the third magnetic core column are all wound with a third coil group;

[0018] Each of the third coil groups is connected in parallel with a capacitor unit.

[0019] The present invention also provides an AC low-voltage power distribution system, which includes at least one voltage balancing device with customized power intelligent output as described above and a transformer, and each of the voltage balancing devices is connected in series with the transformer.

[0020] Furthermore, the system further comprises a first switch unit;

[0021] 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;

[0022] When the first switch unit is in the on state, a 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 a voltage-balanced multi-phase voltage signal through the first switch unit;

[0023] 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.

[0024] Furthermore, the system further includes a second switch unit;

[0025] 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;

[0026] When the second switch unit is in the first state, a 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 a voltage-balanced multi-phase voltage signal through the second switch unit;

[0027] 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;

[0028] 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 state.

[0029] The present invention further provides an AC low-voltage power distribution system, comprising 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 with customized power intelligent output as described above;

[0030] 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;

[0031] 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.

[0032] The present invention has at least the following beneficial effects:

[0033] In the solution 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 fluxes generated by the coupling of the first coil group and the second coil group intersect with each other. When unbalanced voltage and current pass through the voltage balancing device of the present application, the first coil group and the second coil group exhibit 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 excess reverse 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 the shared magnetic circuit reduces material cost and manufacturing complexity, while also reducing the volume and weight of the device, which helps to reduce overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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 to the technical solution of the present invention.

[0035] Figure 1 This is a schematic structural diagram of a voltage balancing device for customized power intelligent output according to this embodiment;

[0036] Figure 2 is a circuit schematic diagram of a voltage balancing device applicable to a three-phase power supply according to this embodiment;

[0037] Figure 3 This is a circuit schematic diagram of the third coil group in the voltage balancing device for a three-phase power supply according to this embodiment;

[0038] Figure 4 1 is a schematic structural diagram of a voltage balancing device applicable to a three-phase power supply according to the present embodiment;

[0039] Figure 5 Schematic diagram of the structure of the AC low-voltage power distribution system of this embodiment;

[0040] Figure 6 is a schematic diagram of the first switch unit in the AC low-voltage power distribution system of this embodiment being in a conducting state;

[0041] Figure 7 is a schematic diagram of the AC low-voltage power distribution system of this embodiment in which the first switch unit is in an off state;

[0042] Figure 8 is a schematic diagram of the second switch unit in the AC low-voltage power distribution system of this embodiment being in a first state;

[0043] Figure 9is a schematic diagram of the second switch unit in the AC low-voltage power distribution system of this embodiment being in a second state;

[0044] Figure 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;

[0045] 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

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to 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 intended to limit the present invention.

[0047] Three-phase imbalance is a common problem in power distribution systems, leading to voltage instability, increased reactive power loss, reduced power factor, equipment overheating, and system instability. To address these issues, three-phase imbalance regulation technology has emerged. It achieves system balancing by installing balancers in unbalanced circuits. These balancers can be capacitors, inductors, or transformers. They monitor and regulate the voltage between the three phases, ensuring that each phase has an equal voltage, thus maintaining three-phase balance.

[0048] The primary function of a three-phase voltage balancer is to prevent equipment damage and efficiency loss caused by three-phase imbalance, thereby protecting the stability and safety of the power system. In some cases, the balancer also features an automatic adjustment function, automatically adjusting when an imbalance is detected to maintain stable system operation. Furthermore, the installation of automatic regulators and phase sequence protectors is also common. These devices can monitor system imbalances and automatically adjust, as well as cut off power when the phase sequence is incorrect, protecting equipment from damage.

[0049] 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, and 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, certain types of balancers may introduce additional energy loss, 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. To address the above problems, this application provides the following embodiments.

[0050] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the voltage balancing device for customized power intelligent output in this embodiment.

[0051] This embodiment provides a voltage balancing device 100 for customized intelligent power output, which is used to adjust multi-phase voltage signals. 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.

[0052] In some embodiments, each second coil group 112 includes a first coil and a second coil; one end of the first coil serves as the input end of the second coil group 112, the other end of the first coil serves as the 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.

[0053] 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 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 exhibit different degrees of magnetic saturation, and the coil group with higher voltage will naturally absorb more inductive reactive power. By utilizing the mechanism that the magnetic potential within the magnetic circuit always tends to a relatively balanced state, through electromagnetic interaction and conversion, the excess reverse 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 up a separate magnetic circuit for each coil group, the shared magnetic circuit design reduces material cost and manufacturing complexity, while also reducing the volume and weight of the device, which helps to reduce overall cost.

[0054] 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 this embodiment.

[0055] The circuit is a three-phase transformer circuit with filtering capabilities. Three-phase voltage signals are input to the first and second coil groups, where voltage conversion is achieved. The voltage balancing device of this embodiment also functions as a low-pass filter, capable of filtering out noise signals of varying frequencies.

[0056] 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 corresponding magnetic core column of the voltage balancing unit.

[0057] 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 a surface of a target magnetic core main body among the plurality of magnetic core columns.

[0058] In some embodiments, each third coil group is connected in parallel with a capacitor.

[0059] Please refer to Figure 3 , Figure 3 This is a circuit diagram of the third coil group in the voltage balancing device for a three-phase power supply according to 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.

[0060] 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 end 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.

[0061] In some embodiments, the first magnetic core leg, the second magnetic core leg, and the third magnetic core leg are each wound with a third coil group; and each third coil group is connected in parallel to the capacitor unit.

[0062] Please refer to Figure 4 , Figure 4 3 is a schematic structural diagram of a voltage balancing device applicable to a three-phase power supply according to this embodiment.

[0063] After the voltage balancing device is connected in series to the power system's main power circuit, when the voltage and current from the input pass through the device, the device's preset voltage level reduces the voltage to allow for power adjustment. The first and second coil groups generate magnetic forces on the coupled magnetic cores of the voltage and current passing through them. Because the two coil groups are wound around two different core legs of the same three-legged iron core, the magnetic flux generated by the coupling of the first and second coil groups intersects. When unbalanced voltage and current pass through the device, the two coil groups exhibit different levels of magnetic saturation. The coil group with the higher voltage will naturally absorb more inductive reactive power. The voltage balancing device utilizes the mechanism by which the magnetic potential within its core always tends towards a relatively balanced state. Through electromagnetic interaction and conversion, it resists excess reverse current between the two coil groups. Finally, the voltage is output through the intersection of the first and second coils in the second coil group, and the output phase voltage is now relatively balanced.

[0064] 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.

[0065] It can be understood that voltage balancing devices are typically connected in series with the main power supply circuit of a power system, enabling centralized control and comprehensive management of the input power of the load system, thereby improving power quality. While voltage balancing devices resemble inductive devices, their unique construction gives them capacitive operating characteristics. Improving the system's power factor using this technology does not alter the inductive nature of the load; it simply reduces the load's inductive nature. This means that rather than reducing the load system's power factor, it actually helps improve it.

[0066] Please refer to Figure 5 , Figure 5 Schematic diagram of the structure of the AC low-voltage power distribution system of this embodiment.

[0067] An AC low-voltage power distribution 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.

[0068] 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.

[0069] This embodiment also provides an AC low-voltage power distribution system, which includes at least one voltage balancing device with customized power intelligent output and a transformer as in any of the above embodiments, and each voltage balancing device is connected in series with the transformer.

[0070] 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.

[0071] 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 the on 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 output through the first switch unit to obtain a voltage-balanced multi-phase voltage signal; when the first switch unit is in the off state, the multi-phase voltage signal is input to the first switch unit and then output.

[0072] Please refer to Figure 6 , Figure 6 This 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.

[0073] The first switch unit includes a first switch and a second switch. The input voltage signal is input to the voltage balancing device through the closed first switch, and then the balanced voltage signal adjusted by the voltage balancing device is output through the closed second switch.

[0074] Please refer to Figure 7 , Figure 7 This 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.

[0075] 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.

[0076] In some embodiments, the AC low-voltage power distribution system further 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 with voltage balance; 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.

[0077] Please refer to Figures 8 to 10The second switch unit includes a third switch and a fourth switch. When the second switch unit is in a first state, an input voltage signal is input to the voltage balancing device through the closed third switch, and a balanced voltage signal adjusted by the voltage balancing device is output through the closed fourth switch. When the second switch unit is in a 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 a third state, the third switch and the fourth switch are turned off, the voltage balancing device is in a stopped state, and the input power supply is cut off.

[0078] In the AC low-voltage power distribution system provided by the above 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 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 the shared magnetic circuit reduces material cost and manufacturing complexity, while also reducing the volume and weight of the device, which helps to reduce overall cost.

[0079] 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 sequential order. 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, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, device, apparatus, 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, apparatus, 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.

[0080] In the several embodiments provided in this 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 merely schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, 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.

[0081] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0082] Although the description of the present application has been quite detailed and specifically describes several embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be considered to provide a broad possible interpretation of these claims by reference to the appended 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 foreseen by the inventors, which is intended 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. An AC low-voltage power distribution system, characterized in that: The system includes at least one voltage balancing device with customized power intelligent output and a transformer, and each of the voltage balancing devices is connected in series with the transformer; The device is used to adjust a multi-phase voltage signal, and the device includes a plurality of voltage balancing units, wherein the input end of each of the voltage balancing units is used to input a phase voltage signal of 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 serves 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; The system further 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 the first state, a 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 a voltage-balanced multi-phase voltage signal through the second switch unit; 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 state.

2. The AC low-voltage power distribution system 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 AC low-voltage power distribution system according to claim 2, characterized in that: The device also includes a magnetic core, wherein the magnetic core includes a plurality of magnetic core legs; 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 AC low-voltage power distribution system according to claim 2, characterized in that: The device further includes 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 leg is connected to the second coil group on the second magnetic core leg, the second coil group on the first magnetic core leg is connected to the first coil group on the third magnetic core leg, and the first coil group on the second magnetic core leg is connected to the second coil group on the third magnetic core leg.

5. The AC low-voltage power distribution system according to claim 3, characterized in that: The apparatus further includes 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 AC low-voltage power distribution system 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 a capacitor unit.

7. The AC low-voltage power distribution system according to any one of claims 1 to 6, characterized in that: The system further 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 the on state, a 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 a 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.

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