A single-core, heterogeneous-coupling phase-shifting transformer and a phase angle adjustment device

Abstract

The present invention provides a single-core, heterogeneous-coupling auto-phase-shifting transformer and its phase angle adjustment device, belonging to the technical field of phase-shifting transformers. The transformer comprises three phases, each phase comprising: a first main winding, a second main winding, at least one auxiliary winding, and a tap-changer device; the auxiliary winding of the current phase is connected to one end of the first main winding of the two adjacent phases through the tap-changer device; the other ends of the first main winding and the second main winding are directly or indirectly connected to the power supply end or the load end of the external line; the auxiliary winding also leads to at least one neutral point output by connecting to the tap-changer device, which is used to establish or connect the neutral point of the system. The present invention adopts a single-core structure to achieve symmetrical phase adjustment, reducing costs and floor space; at the same time, the tap-changer is located at the center point of the star-connected phase-adjusting winding, which prevents the tap-changer from being subjected to high voltage impact at the line end, reduces the insulation requirements of the tap-changer, and further reduces costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of phase-shifting transformers, and in particular relates to a single-core, different-coupling auto-coupling phase-shifting transformer and a phase angle adjustment device. Background Art

[0002] A phase-shifting transformer is a special type of transformer that can change the phase and amplitude of voltage. When connected in series with a line, it can effectively improve the voltage distribution of the power grid and reduce line losses. This is of great significance for optimizing power transmission, improving the grid structure, and enhancing power quality.

[0003] Phase-shifting transformers currently on the market can be divided into single-core and dual-core types based on their core structures. Existing single-core phase-shifting transformers have a limited phase-shifting range and require the on-load tap-changer to be located at the line end, resulting in harsh operating environments and making them unsuitable for high-voltage transmission lines. While dual-core phase-shifting transformers can accommodate the on-load tap-changer at the neutral point, they require a large footprint and are expensive to manufacture. Summary of the Invention

[0004] In view of this, the present invention aims to provide a new topology phase-shifting transformer suitable for high voltage level, neutral point phase modulation, and single-core structure, so as to solve the above-mentioned problems existing in existing single-core or dual-core structure phase-shifting transformers.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a single-core hetero-column auto-phase-shifting transformer, which adopts a single-core structure and includes three phases, each phase including:

[0007] The main winding includes a first main winding and a second main winding;

[0008] at least one auxiliary winding;

[0009] A tap changer device, which is equipped with a polarity selection function at each auxiliary winding, is used to connect the auxiliary winding to the main winding of the adjacent phase and can change the polarity of the connection;

[0010] The auxiliary winding of the current phase is connected to one end of the first main winding of the first adjacent phase and one end of the second main winding of the second adjacent phase through corresponding two polarities;

[0011] The first main winding of the current phase is connected to the two corresponding polarities of the auxiliary winding of the second adjacent phase;

[0012] The second main winding of the current phase is connected to the two corresponding polarities of the auxiliary winding of the first adjacent phase;

[0013] The other ends of the first main winding and the second main winding are respectively connected directly or indirectly to the power supply end or the load end of the external circuit to form a circuit loop;

[0014] The auxiliary winding also leads to at least one neutral point output by connecting to the tap changer device, which is used for establishing or connecting the system neutral point;

[0015] The tap changer device allows switching between different gears to adjust the voltage ratio of the auxiliary winding, thereby achieving simultaneous voltage and phase regulation.

[0016] Furthermore, the tap changer device realizes a polarity selection function by configuring a polarity selector.

[0017] Furthermore, the tap changer device is also connected to a control module, which is used to dynamically adjust the connection state between the auxiliary winding and the main winding according to a preset algorithm. The tap changer device is configured to adjust the connection state between the auxiliary winding and the main winding according to the instructions of the control module to dynamically adjust the phase angle.

[0018] Furthermore, when the tap changer device is in positive tapping, the control module determines the magnitude of the phase shift angle according to the following formula:

[0019]

[0020] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0021] Furthermore, when the tap changer device is in negative tapping, the control module determines the magnitude of the phase adjustment angle according to the following formula:

[0022]

[0023] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0024] Furthermore, the connection status includes a connection mode and / or a turns ratio.

[0025] Furthermore, all windings and tap-changer devices of the single-core, heterogeneous-coupling phase-shifting transformer are connected inside the same casing and then led out, or led out and then connected.

[0026] In a second aspect, the present invention provides a phase angle adjustment device, comprising:

[0027] a control unit configured to control the tap changer device to adjust the connection state of the phase-shifting transformer winding according to the target phase adjustment angle, so as to dynamically adjust the phase angle;

[0028] And, a phase-shifting transformer connected to the control unit, the phase-shifting transformer adopts the single-core, different-column auto-coupling phase-shifting transformer as in the first aspect.

[0029] Furthermore, when the tap changer device is in positive tapping, the control unit determines the magnitude of the phase shift angle according to the following formula:

[0030]

[0031] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0032] Furthermore, when the tap changer device is in negative tapping, the control unit determines the magnitude of the phase adjustment angle according to the following formula:

[0033]

[0034] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0035] In summary, the present invention provides a single-core hetero-coupling auto-phase-shifting transformer and a phase angle adjustment device thereof, which adopts a single-core structure and includes three phases, each phase including: a main winding, including a first main winding and a second main winding; at least one auxiliary winding; a tap-changer device, wherein the tap-changer device is equipped with a polarity selection function at each auxiliary winding, for connecting the auxiliary winding with the main winding of the adjacent phase, and is capable of changing the polarity of the connection; the auxiliary winding of the current phase is connected to one end of the first main winding of the first adjacent phase and one end of the second main winding of the second adjacent phase through the corresponding two polarities; the current phase The first main winding is connected to the two corresponding polarities of the auxiliary winding of the second adjacent phase; the second main winding of the current phase is connected to the two corresponding polarities of the auxiliary winding of the first adjacent phase; the other ends of the first main winding and the second main winding are directly or indirectly connected to the power supply end or load end of the external line to form a circuit loop; the auxiliary winding also leads to at least one neutral point output through connection with the tap changer device, which is used to establish or connect the system neutral point; the tap changer device allows switching between different gears to adjust the voltage ratio of the auxiliary winding, thereby achieving simultaneous voltage and phase adjustment. The present invention adopts a single-core structure to achieve symmetrical phase adjustment, reducing costs and floor space; at the same time, the tap changer is located at the center point of the star-connected phase adjustment winding, which prevents the tap changer from being subjected to high voltage impact at the line end, reduces insulation requirements for the tap changer, and further reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A topological diagram of a single-core, heterogeneous-coupling auto-phase-shifting transformer provided in an embodiment of the present invention;

[0038] Figure 2 The topology and voltage phase diagram of the single-core asymmetrical phase-shifting transformer provided by the embodiment of the present invention;

[0039] Figure 3 The topology and voltage phase diagram of the single-core phase-shifting transformer provided in the embodiment of the present invention;

[0040] Figure 4 The topology and voltage phase diagram of the triangular-hexagonal phase-shifting transformer provided in an embodiment of the present invention;

[0041] Figure 5 Topological diagrams of dual-core asymmetric and symmetrical phase-shifting transformers provided in embodiments of the present invention;

[0042] Figure 6 A schematic diagram of the winding connection of a single-core, heterogeneous-coupling, phase-shifting transformer provided in an embodiment of the present invention;

[0043] Figure 7a The voltage vector diagram of the positive tapped phase-shift transformer under no-load condition provided by the embodiment of the present invention;

[0044] Figure 7b The voltage vector diagram of the negative tapped phase-shift transformer under no-load condition provided by the embodiment of the present invention;

[0045] Figure 8a A diagram showing the relative relationship of the phase angle adjustment for the positive tap provided in an embodiment of the present invention;

[0046] Figure 8b This is a diagram showing the relative relationship of the negative tap down phase angle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purposes, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0048] As energy supply centers separate from power load centers, power systems are gradually evolving toward high-voltage, high-capacity, large-scale, interconnected, and long-distance transmission. This trend has facilitated the interconnection of regional power grids and effectively improved power supply reliability. However, the increasing capacity and complexity of the grid structure have also brought a series of challenges and problems.

[0049] In interconnected regional power grids, system power flows are completely dependent on the load at each node. Without any control measures, power flows in parallel lines and ring networks are distributed according to impedance. This natural distribution of power can lead to irrational power flow distribution along lines, causing some lines to carry excessive loads while others have relatively low utilization. This unbalanced load distribution not only affects the overall efficiency of the power system but also poses a threat to the safe and stable operation of the grid. Therefore, appropriate power flow control measures are necessary to regulate the transmission power of the lines.

[0050] A phase-shifting transformer is a special type of transformer that can change the phase and amplitude of voltage. When connected in series with a line, it can effectively improve the voltage distribution of the power grid and reduce line losses. This is of great significance for optimizing power transmission, improving the grid structure, and enhancing power quality.

[0051] The phase-shifting transformers currently on the market can be divided into single-core and double-core types based on the differences in core structure, and can be divided into asymmetric and symmetric types based on the change in voltage amplitude after phase shifting.

[0052] If the excitation unit and series unit of the phase-shifting transformer share a core, it is a single-core type; if the excitation unit and series unit use independent cores, it is a dual-core type. If the line voltage amplitude does not change after phase shifting, it is a symmetrical type; otherwise, it is an asymmetrical type.

[0053] Advantages and disadvantages of the single-core type: The structure is simple, but the voltage regulating winding and the on-load tap changer are directly connected to the line end, directly withstanding short-circuit current and overvoltage. If necessary, a series reactor and lightning arrester are required. It is mostly used for voltage levels of 110kV and below.

[0054] Advantages and Disadvantages of the Dual-Core Type: The tap changer is located on the neutral point, effectively reducing insulation levels. At zero phase shift, the dual-core PST still has sufficient impedance to meet the product's short-circuit withstand requirements, eliminating the need for a series reactor. While this structure has the disadvantage of being complex, it offers flexibility and design freedom.

[0055] See also Figure 1 , Figure 1 1 is a topological structure diagram of a single-core, heterogeneous-coupling auto-phase-shifting transformer taking phase 1 as an example in some embodiments.

[0056] The following is a brief introduction to the typical phase-shifting transformer connection topology.

[0057] See also Figure 2 , Figure 2 It is the topology and voltage phase diagram of single-core asymmetrical phase-shifting transformer.

[0058] Take phase A as an example: the secondary side voltage regulating winding coupled with VBC is connected in series in the phase A circuit. BC and V SA The phases are perpendicular to each other, so the compensation voltage ΔV A With V SA By adjusting the tap changer and polarity switch on the voltage regulating winding, the compensation voltage ΔV can be changed. A The size and direction of the phase shift angle α can be adjusted.

[0059] An asymmetric phase-shifting transformer will change the voltage amplitude after phase shifting. The larger the phase shift angle, the greater the change in voltage amplitude, which may cause the line voltage to exceed the limit after phase shifting. Therefore, the phase shift range of an asymmetric phase-shifting transformer is relatively small.

[0060] See also Figure 3 , Figure 3 It is the topology and voltage phase diagram of single-core symmetrical phase-shifting transformer.

[0061] The single-core symmetrical voltage regulating winding is evenly divided into two parts, namely the source side winding and the load side winding. Both sides of the winding are equipped with on-load tap changers, and their gears must be kept consistent so that the compensation voltage on both sides of the winding is equal.

[0062] See also Figure 4 , Figure 4 This is the topology and voltage phase diagram of the triangle-hexagonal phase-shifting transformer.

[0063] Similar to the single-core symmetry, the voltage regulating winding is divided equally into two parts: the source side winding and the load side winding. Both windings are equipped with on-load tap changers, with the gears kept consistent. The compensation voltage on both windings is the same. The main difference is that the inner delta winding is connected to the voltage regulating coil and then connected in series to form a hexagonal connection.

[0064] See also Figure 5 , Figure 5 It is the topology diagram of dual-core asymmetrical and symmetrical phase-shifting transformer.

[0065] The regulating winding and on-load tap-changer of the single-core phase-shifting transformer are directly connected in series in the line. The on-load tap-changer is directly affected by the system overvoltage and short-circuit current, which is not conducive to the safe and stable operation of the on-load tap-changer. Therefore, it is not suitable for high voltage levels. When the voltage level is 220kV and above, a series transformer is required to isolate the regulating winding from the line, that is, the double-core type.

[0066] The excitation unit and series unit of a bipolar phase-shifting transformer use separate transformers. The on-load tap-changer is isolated from the system by the series transformer, eliminating the direct impact of system overvoltage and short-circuit current. This makes it suitable for high voltage levels. Table 1 compares phase-shifting transformers with different topologies.

[0067] Table 1 Comparison of phase-shifting transformers with different topologies

[0068]

[0069] In summary, existing single-core phase-shifting transformers have a relatively small phase-shifting range, require on-load tap-changers to be located at the line end, and operate in a harsh environment, making them unsuitable for high-voltage transmission lines. Although dual-core phase-shifting transformers can have on-load tap-changers located at the neutral point, they occupy a large area and have high manufacturing costs. Therefore, the present invention proposes a single-core, hetero-column auto-coupling phase-shifting transformer and its phase angle adjustment device suitable for high voltage levels (220 kV and above), neutral point phase adjustment, and a single-core structure.

[0070] The following is a detailed introduction to an embodiment of a single-core, heterogeneous-coupling auto-phase-shifting transformer of the present invention.

[0071] See also Figure 1 This embodiment provides a single-core, heterogeneous-coupling, phase-shifting transformer, which has a single-core structure and includes three phases, each phase including:

[0072] The main winding includes a first main winding and a second main winding;

[0073] at least one auxiliary winding;

[0074] A tap changer device, which is equipped with a polarity selection function at each auxiliary winding, is used to connect the auxiliary winding to the main winding of the adjacent phase and can change the polarity of the connection;

[0075] The auxiliary winding of the current phase is connected to one end of the first main winding of the first adjacent phase and one end of the second main winding of the second adjacent phase through corresponding two polarities;

[0076] The first main winding of the current phase is connected to the two corresponding polarities of the auxiliary winding of the second adjacent phase;

[0077] The second main winding of the current phase is connected to the two corresponding polarities of the auxiliary winding of the first adjacent phase;

[0078] The other ends of the first main winding and the second main winding are respectively connected directly or indirectly to the power supply end or the load end of the external circuit to form a circuit loop;

[0079] The auxiliary winding also leads to at least one neutral point output by connecting to the tap changer device, which is used for establishing or connecting the system neutral point;

[0080] The tap changer device allows switching between different gears to adjust the voltage ratio of the auxiliary winding, thereby achieving simultaneous voltage and phase regulation

[0081] It should be noted that the single-core, heterogeneous-coupling auto-phase-shifting transformer of this embodiment has a three-phase structure, capable of processing three-phase AC power systems and suitable for multi-phase applications such as power transmission and motor control. Each phase consists of four main components: a first main winding, a second main winding, an auxiliary winding, and a tap changer for voltage and phase adjustment.

[0082] The auxiliary winding of phase 1 is connected to one of the main windings of phase 2 or phase 3 via the polarity selector of the tap changer. The polarity selector allows the polarity of the connection to be changed, which means that the direction of the phase difference can be adjusted, thereby achieving positive or negative phase shift.

[0083] The other ends of the main windings for phases 2 and 3 are connected to the incoming or outgoing terminals of the line, respectively. This connection ensures that the transformer can effectively connect to the external power grid for the transmission or conversion of electrical energy.

[0084] The tapped ends of the auxiliary winding are connected via the tap changer selector and then brought out as the neutral point of the system. This is crucial for the stable operation of the three-phase system, especially when the neutral line is required for reactive power compensation, voltage measurement or protection.

[0085] This embodiment, by adjusting the polarity selector and tap changer, can flexibly control the voltage phase of phase 1 relative to phases 2 or 3, thereby fine-tuning the phase relationship of the entire three-phase system. This is particularly important for complex power systems or motor drive applications that require precise phase matching. Furthermore, this embodiment utilizes a single-core structure, with the main coil and the other two phase-shifting coils achieving phase adjustment. The tap changer is located at the center of the star-connected phase-shifting winding, reducing the insulation requirements of the tap changer.

[0086] In a preferred embodiment of the present invention, the tap changer device implements a polarity selection function by configuring a polarity selector. Connecting the auxiliary winding of the current phase to one end of the first main windings of two adjacent phases via the tap changer device comprises: connecting two ends of the auxiliary winding of the current phase to two polarities of the polarity selector of the tap changer device, respectively; and connecting the polarity selector of the tap changer device to one end of the first main windings of the two adjacent phases.

[0087] Please refer again Figure 1Taking phase 1 as an example, the connection topology is as follows: the auxiliary winding of phase 1 is connected to both polarities of the tap changer polarity selector, which is connected to one of the main windings of phases 2 and 3; the other outlet of the main windings of phases 2 and 3 is connected to the incoming (or outgoing) end of the line; the auxiliary winding outlet is connected to the tap changer selector and then led out as the neutral point. The polarity selection function of the tap changer not only affects the phase, but also can be used with different taps (or gears) to change the neutral point potential, thereby indirectly adjusting the output voltage of the transformer. In the phase-shifting transformer of this embodiment, this adjustment is very important for meeting voltage requirements under different load conditions.

[0088] In a preferred embodiment of the present invention, the auxiliary winding and the tap changer device are further connected to a control module. The control module is configured to dynamically adjust the connection state between the auxiliary winding and the main winding according to a preset algorithm to achieve continuously adjustable phase angle of the output voltage between the current phase and the adjacent phase. The tap changer device is configured to adjust the connection state between the auxiliary winding and the main winding according to instructions from the control module to adjust the phase angle to a target value.

[0089] In a further embodiment of the present invention, when the tap changer is in positive tapping, the target phase adjustment angle is calculated as follows:

[0090]

[0091] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0092] In a further embodiment of the present invention, when the tap changer device is in negative tapping, the target phase adjustment angle is calculated as follows:

[0093]

[0094] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0095] The following combination Figure 6 -8 introduces the calculation of the phase adjustment angle in the above embodiment.

[0096] Figure 6 The following is a schematic diagram of the winding connection of the single-core, heterogeneous-coupling phase-shifting transformer of this technical solution, where A1-C1 are the auxiliary windings of the three phases, and A2-C3 are the two main windings of the three phases; Figure 7a and Figure 7b The voltage vectors of the phase-shift transformer under no-load conditions in positive tap and negative tap are shown respectively; Figure 8a Figure 8bThe relative relationship of the phase angle of the phase-shift transformer under positive and negative tapping is shown respectively; as shown in Figure 7, according to the definition of three-phase electricity, the phase difference between the phases of the same voltage system of the normal operating transformer is 120°. In addition, according to the principle of magnetic induction, the phase angles of the coils on the same core leg are the same, as shown in Figure 8. Taking the vertical direction as the reference, we have U A1 The phase angle is 0°, let U SA The phase angle difference is α.

[0097] When the tap changer is in positive tapping mode, there are:

[0098]

[0099] Let U B2 =kU A1 , then:

[0100]

[0101] Substituting into formula (1), we have:

[0102]

[0103] When the tap changer is in negative tap, the following can be obtained by analogy:

[0104]

[0105] Furthermore, in one embodiment, Figure 6 In the illustrated topology, the connection positions of the first and second main windings are interchangeable. This allows for design flexibility, allowing the winding connection method to be adjusted to meet specific needs or installation conditions without changing the overall operating principle. This design simplifies the production process, reduces the number of spare parts, and facilitates maintenance and fault replacement.

[0106] In one embodiment, Figure 6 In the illustrated topology, the tap changer's polarity selector can be eliminated, allowing one end of the main winding to be directly connected to one end of the phase-modulating winding, enabling unidirectional phase angle adjustment. In this embodiment, the tap changer's polarity selector is eliminated, and the main winding is directly connected to the phase-modulating (auxiliary) winding. While this approach loses bidirectional phase angle adjustment capability, it simplifies the structure and reduces costs while still enabling unidirectional phase angle adjustment. This is a viable solution for applications requiring only unidirectional phase shifting, such as load regulation where phase requirements are less stringent.

[0107] In one embodiment, all windings and tap changers can be connected within the same housing before being led out, or they can be led out and then connected. All windings and tap changers can be pre-connected within a single housing, or they can be connected separately and then integrated. The former improves the overall compactness and ease of installation of the equipment, reducing the workload and error rate of on-site assembly. The latter facilitates customization or on-site adjustments, especially when flexible configuration is required based on actual conditions. This design takes into account flexibility and convenience in manufacturing and field application.

[0108] The above is a detailed introduction to an embodiment of a single-core heterogeneous auto-coupling phase-shifting transformer of the present invention. The following is a detailed introduction to an embodiment of a phase angle adjustment device of a single-core heterogeneous auto-coupling phase-shifting transformer of the present invention.

[0109] This embodiment provides a phase angle adjustment device for a phase-shifting transformer, comprising:

[0110] a control unit configured to control the tap changer device to adjust the connection state of the phase-shifting transformer winding according to the target phase adjustment angle, so as to dynamically adjust the phase angle of the output voltage;

[0111] And, a phase-shifting transformer connected to the control unit, wherein the phase-shifting transformer adopts the single-core, heterogeneous-column auto-coupling phase-shifting transformer provided in the above embodiment.

[0112] In a further embodiment of the present invention, when the tap changer is in positive tapping, the target phase adjustment angle is calculated as follows:

[0113]

[0114] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0115] In a further embodiment of the present invention, when the tap changer device is in negative tapping, the target phase adjustment angle is calculated as follows:

[0116]

[0117] Where α is the phase difference between the auxiliary winding voltage and the input voltage, and k is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

[0118] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A single-core, heterogeneous-coupling phase-shifting transformer, characterized in that: It adopts a single-core structure with three phases, each phase includes: The main winding includes a first main winding and a second main winding; at least one auxiliary winding; a tap changer device, wherein the tap changer device is equipped with a polarity selection function at each auxiliary winding, for connecting the auxiliary winding to the main winding of the adjacent phase and being able to change the polarity of the connection; The auxiliary winding of the current phase is connected to one end of the first main winding of the first adjacent phase and one end of the second main winding of the second adjacent phase by selecting a polarity from two corresponding polarities; The first main winding of the current phase is connected to one of the two polarities corresponding to the auxiliary winding of the second adjacent phase; The second main winding of the current phase is connected to one of the two polarities corresponding to the auxiliary winding of the first adjacent phase; The other ends of the first main winding and the second main winding are respectively directly or indirectly connected to a power supply end or a load end of an external circuit to form a circuit loop; The auxiliary winding is also connected to the tap changer device to lead out at least one neutral point output for establishing or connecting the system neutral point; The tap changer device allows switching between different gears to adjust the voltage ratio of the auxiliary winding, thereby achieving simultaneous regulation of voltage and phase.

2. The single-core, different-column auto-phase-shifting transformer according to claim 1, characterized in that: The tap changer device realizes the polarity selection function by configuring a polarity selector.

3. The single-core, heterogeneous-coupling phase-shifting transformer according to claim 2, characterized in that: The tap changer device is further connected to a control module, which is configured to dynamically adjust the connection state between the auxiliary winding and the main winding according to a preset algorithm. The tap changer device is configured to adjust the connection state between the auxiliary winding and the main winding according to instructions from the control module to dynamically adjust the phase angle.

4. The single-core, heterogeneous-coupling phase-shifting transformer according to claim 3, characterized in that: When the tap changer is in positive tapping, the control module determines the magnitude of the phase shift angle according to the following formula: ； Where, is the phase angle difference between the auxiliary winding voltage and the input voltage, It is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

5. The single-core, heterogeneous-coupling phase-shifting transformer according to claim 3, characterized in that: When the tap changer is in negative tap mode, the control module determines the phase adjustment angle according to the following formula: ； Where, is the phase angle difference between the auxiliary winding voltage and the input voltage, It is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

6. The single-core, heterogeneous-coupling phase-shifting transformer according to claim 3, characterized in that: The connection status includes a connection mode and / or a turns ratio.

7. The single-core, heterogeneous-coupling phase-shifting transformer according to claim 1, characterized in that: All windings of the single-core, different-column auto-coupling phase-shifting transformer and the tap-changer device are connected inside the same box and then led out, or led out and then connected.

8. A phase angle adjustment device, characterized in that: include: a control unit configured to control the tap changer device to adjust the connection state of the phase-shifting transformer winding according to the target phase adjustment angle, so as to dynamically adjust the phase angle; And, a phase-shifting transformer connected to the control unit, wherein the phase-shifting transformer is a single-core, different-column auto-coupling phase-shifting transformer as described in any one of claims 1-7.

9. The phase angle adjustment device according to claim 8, characterized in that: When the tap changer device is in positive tapping, the control unit determines the magnitude of the phase shift angle according to the following formula: ； Where, is the phase angle difference between the auxiliary winding voltage and the input voltage, It is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

10. The phase angle adjustment device according to claim 8, characterized in that: When the tap changer is in negative tapping, the control unit determines the magnitude of the phase adjustment angle according to the following formula: ； Where, is the phase angle difference between the auxiliary winding voltage and the input voltage, It is the ratio of the main winding voltage to the auxiliary winding voltage amplitude.

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