Split iron core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation

Abstract

The invention discloses a split iron core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation, and belongs to the technical field of transformers. The iron core column of the transformer comprises a main iron core column and a voltage regulating iron core column split from the main iron core column. According to the invention, a load winding and a voltage regulating winding are respectively wound on a split iron core column, and then a network side winding is wound on the load winding and the voltage regulating winding; the load winding and the voltage regulating winding are connected with the converter, and the converter comprises a voltage compensation converter and a current compensation converter; the basic principle of voltage regulation is that the magnetic flux of a voltage regulation iron core column is changed through a voltage compensation converter, so that the magnetic flux fluctuation of a main iron core column caused by grid-side voltage fluctuation is inhibited, and the stable control of load voltage is indirectly realized; distortion, harmonic waves and reactive components of load current are absorbed through the current compensation converter, an isolation transformer is omitted, and the overall structure of the HDT is simplified.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformers, and particularly relates to a split core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation. BACKGROUND

[0002] With the development of the power system in the direction of intelligence and diversification, as a key equipment of the power grid, the performance of the distribution transformer directly affects the power quality and power supply reliability. The traditional distribution transformer is limited by its fixed transformation ratio and mechanical voltage regulation mechanism, and has inherent defects such as regulation lag and insufficient control accuracy when dealing with complex conditions such as grid connection of distributed power and dynamic fluctuation of load. Especially at the end nodes of the distribution network, the dynamic characteristics and steady-state accuracy of load voltage regulation have gradually failed to meet the needs of new types of loads. Therefore, in the future new type of distribution network environment, improving the control ability and dynamic performance of the distribution transformer has become a core problem to be solved at present.

[0003] In view of the above problems, some scholars have proposed the concept of hybrid distribution transformer (HDT), which basically connects a small-capacity power electronic converter to the traditional transformer to realize a composite topology structure with electromagnetic conversion and power electronic regulation. Its outstanding advantage is that it not only retains the core advantages of high reliability and low cost of traditional transformers, but also realizes fast and accurate regulation of voltage and current amplitude, phase, power factor and other parameters with the help of power electronic converters. Studies have shown that HDT can effectively solve the power quality problems under complex conditions such as high proportion of renewable energy access and fluctuation of impact load, and provide key technical support for modern intelligent distribution networks.

[0004] The main feature of the existing HDT is to directly connect the voltage compensation converter in series between the power supply and the load. In order to achieve electrical isolation and match the lower voltage level of the converter, the following two technical routes can be taken. On the one hand, the voltage compensation converter can be directly connected to the low-voltage side of the distribution network; at this time, the cross section of the main transformer needs to be increased to cope with the magnetic saturation caused by the sudden rise of the network side voltage; but this will increase the cost of the main transformer, and the port voltage of the transformer is still fluctuating, which will still affect the dynamic characteristics of the converter. On the other hand, an isolation transformer is added to directly connect the converter to the high-voltage side, thereby completely eliminating the port voltage fluctuation of the main transformer; in this way, the additional isolation transformer can avoid the need to increase the cross section of the main transformer, but the additional isolation transformer will still increase the overall complexity and cost of the HDT. Although the conjugate magnetic integration technology can combine the main transformer and the isolation transformer, the adjustment structure is relatively complex, the cost of manufacturing with existing technology is high, and it is difficult to industrialize and popularize. SUMMARY

[0005] The application aims at overcoming the defects of the prior art, and provides a split core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation to solve the problems of three-phase main transformer core redundancy waste and three-phase system overall structure complexity caused by the low voltage level matching and high efficient electrical isolation of the existing three-phase HDT.

[0006] To achieve the above-mentioned purpose, the application adopts the following technical solutions: The application discloses a split core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation, which comprises three-phase main core columns, three-phase voltage regulation core columns, windings, an upper iron yoke and a lower iron yoke. Each phase voltage regulation core column is arranged beside the corresponding main core column, and the upper ends of the main core columns and the voltage regulation core columns are connected with the upper iron yoke, and the lower ends are connected with the lower iron yoke. The windings are divided into grid side windings, load windings and voltage regulation windings; the load windings are wound around the main core columns, the voltage regulation windings are wound around the voltage regulation core columns, and the grid side windings are wound outside the load windings and the voltage regulation windings of the same phase. The load windings and the voltage regulation windings are used for connecting a converter; the converter comprises current compensation converters, voltage compensation converters and a DC bus split capacitor in parallel; the neutral points of the load windings and the voltage regulation windings are connected with the midpoint of the DC bus split capacitor.

[0007] The application further improves in that: Preferably, the windings are layer windings.

[0008] Preferably, the three-phase main core columns comprise an A-phase main core column, a B-phase main core column and a C-phase main core column; the three-phase voltage regulation core columns comprise an A-phase voltage regulation core column, two B-phase voltage regulation core columns and a C-phase voltage regulation core column. The A-phase voltage regulation core column is arranged beside the A-phase main core column, the two B-phase voltage regulation core columns are arranged on the two sides of the B-phase main core column respectively, and the C-phase voltage regulation core column is arranged beside the C-phase main core column.

[0009] Preferably, the cross-sectional areas of the A-phase voltage regulation core column and the C-phase voltage regulation core column are equal; the cross-sectional area of the B-phase voltage regulation core column is half of the cross-sectional area of the A-phase voltage regulation core column, and the sum of the cross-sectional areas of the two B-phase voltage regulation core columns is equal to the cross-sectional area of the A-phase voltage regulation core column.

[0010] Preferably, the voltage regulation winding of the B-phase is composed of two sub voltage regulation windings with equal number of turns in series, and the two sub voltage regulation windings are wound around the B-phase voltage regulation core columns on the two sides of the B-phase respectively.

[0011] Preferably, the cross-sectional area of the A-phase main core column is greater than that of the A-phase voltage regulating core column, the cross-sectional area of the B-phase main core column is greater than the sum of the cross-sectional areas of the two B-phase voltage regulating core columns, and the cross-sectional area of the C-phase main core column is greater than that of the C-phase voltage regulating core column.

[0012] Preferably, the grid-side winding is connected to the grid in a delta connection, the load winding is connected to the load in a star connection with a neutral point, and the voltage regulating winding is connected to the converter in a star connection with a neutral point.

[0013] Preferably, the main core column and the voltage regulating core column of each phase are connected to the iron yokes on both sides through 45-degree bevel joints.

[0014] Preferably, the magnetic flux of each phase of the grid-side winding is equal to the sum of the magnetic fluxes of the main core column and the voltage regulating core column of each phase.

[0015] Preferably, the voltage compensation converter controls the magnetic flux of the voltage regulating core column through the voltage regulating winding, so that the magnetic flux of the main core column remains unchanged, and the current compensation converter is connected in parallel with the load winding.

[0016] Compared with the prior art, the present application has the following beneficial effects: The present application proposes a split core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation, which splits a small part of the main core column of a traditional three-phase distribution transformer into a voltage regulating core column, equivalently splits the original main core, and installs a voltage regulating winding thereon, while only winding a load winding on the original main core column, and then wrapping a grid-side winding outside the load winding and the voltage regulating winding, thereby realizing a new HDT voltage regulation mode. This design omits the isolation transformer, simplifies the overall structure of the HDT, is equivalent to directly connecting the voltage compensation converter across the grid-side high voltage level, realizes stable control of the transformer port voltage, and does not affect electrical isolation, effectively matches the low voltage level of the voltage compensation converter, and is therefore a new HDT scheme with outstanding competitive advantages. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The main circuit topology of the split core type HDT of the present application; Figure 2 The electromagnetic body diagram of the split core type three-phase HDT of the present application; Figure 3 The core structure diagram of the split core type three-phase HDT of the present application.

[0018] In the drawings: 10, main core column; 11, voltage regulating core column; 12, upper iron yoke; 13, lower iron yoke; 14, DC bus capacitor. DETAILED DESCRIPTION

[0019] The application will be described in further detail below with reference to the drawings: Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar designations throughout the several views, and repeated description is omitted. The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0020] The basic principle of existing hybrid distribution transformer (HDT) to realize load voltage stability control is to directly connect a controllable voltage source between the network side and the load side, and the controllable voltage source can be realized by a PWM converter. Based on the magnetic flux regulation principle, a split core type three-phase HDT circuit and magnetic circuit topology are proposed. The load winding and the voltage regulation winding are wound on the split core column respectively, and then the network side winding is wound on the load winding and the voltage regulation winding. The basic principle of voltage regulation is to change the magnetic flux of the voltage regulation core column through the voltage compensation converter, thereby suppressing the magnetic flux fluctuation of the main core column caused by the network side voltage fluctuation, so as to indirectly realize the load voltage stability control. The current compensation converter is directly connected across the load winding, directly absorbing the distortion, harmonic and reactive components of the load current, and realizing the sinusoidal unit power factor control of the network side current based on the magnetic potential balance principle. The new HDT omits the isolation transformer necessary for the voltage compensation converter to access the high voltage level of the network side, and only uses three windings to realize electrical isolation, so that the overall structure of the system is simpler.

[0021] The application discloses a split core type three-phase hybrid distribution transformer based on magnetic flux voltage regulation, which comprises a core structure, windings and a converter. The core structure comprises three main core columns 10, a split voltage regulation core column 11, an upper yoke 12, a lower yoke 13 and windings. Each phase winding comprises a network side winding, a load winding and a voltage regulation winding. The upper and lower ends of the main core column 10 and the voltage regulation core column 11 are connected to the upper and lower yokes respectively, forming six windows, realizing a complete three-phase integrated core, thereby saving ferromagnetic material. The network side winding is wound outside the main core column and the voltage regulation core column of the same phase, the load winding is wound outside the main core column of the phase, the voltage regulation winding is wound outside the voltage regulation core column of the phase, the network side winding is outside the load winding and the voltage regulation winding, the network side winding is magnetically linked with the main core column and the voltage regulation core column, and the load winding and the voltage regulation winding are used for connecting the converter. The voltage regulation core column in the structure is equivalent to an auxiliary core split from the original main core column and is arranged next to the main core column. The scheme omits the isolation transformer, simplifies the complexity of the overall HDT system without affecting the electrical isolation performance, and improves the utilization rate of ferromagnetic material.

[0022] The load winding and the voltage regulating winding are used to connect a transformer, the transformer includes a current compensation transformer, a voltage compensation transformer and a DC bus split capacitor, and the neutral points of the voltage regulating winding and the load winding are connected to the midpoint of the DC bus split capacitor.

[0023] In some embodiments of the present application, the winding is a layer winding.

[0024] In some embodiments of the present application, each phase voltage regulating core column is arranged next to each phase main core column, and to realize structural symmetry, the B phase main core column is split into two small core columns, and the core cross section is half of that of the A voltage regulating core column and the C phase voltage regulating core column. The A phase voltage regulating core column and one B phase voltage regulating core column are arranged between the A phase main core column and the B phase voltage regulating core column, and the other B phase voltage regulating core column and the C phase voltage regulating core column are arranged between the B phase main core column and the C phase main core column.

[0025] The cross-sectional area of the A phase main core column is greater than that of the A phase voltage regulating core column, the cross-sectional area of the B phase main core column is greater than the sum of the cross-sectional areas of the two B phase voltage regulating core columns, and the cross-sectional area of the C phase main core column is greater than that of the C phase voltage regulating core column.

[0026] Each phase voltage regulating winding is wound on the voltage regulating core column 11, wherein the B phase voltage regulating winding is formed by two sub-voltage regulating windings with equal number of turns connected in series, and the two sub-voltage regulating windings are wound on the voltage regulating core columns on both sides of the B phase main core column respectively; each phase load winding is wound on the main core column, and each phase grid-side winding is wrapped outside the respective phase load winding and voltage regulating winding and interlinks with the magnetic flux of the main core column and the voltage regulating core column.

[0027] By adjusting the distance between the main core column 10 and the voltage regulating core column 11, the thickness and the number of turns of the winding, the range of the regulated voltage required by the user can be matched.

[0028] In some embodiments of the present application, the grid-side winding is connected to the grid in a delta connection; the load winding is connected to the load in a star connection with a neutral point; the load winding is connected to the transformer; and the voltage regulating winding is connected to the transformer in a star connection with a neutral point.

[0029] In some embodiments of the present application, the magnetic flux interlinked by each phase grid-side winding is equal to the sum of the magnetic fluxes of each phase main core column and the voltage regulating core column, and when the grid voltage fluctuation causes the sum of the magnetic fluxes of the two core columns to fluctuate, the voltage compensation transformer can actively control the magnetic flux of the voltage regulating core column through the voltage regulating winding, so that the magnetic flux of the main core column remains unchanged, thereby indirectly stabilizing the load voltage.

[0030] In some embodiments of the present application, the current compensation transformer is directly connected in parallel across the load winding to inject a compensation current, thereby maintaining the sinusoidal symmetry characteristic of the entire transformer winding current.

[0031] In some embodiments of the present application, the first and last ends of the main core column and the voltage-regulating core column of each phase are respectively connected to the upper / lower yoke by means of a stepped lap joint 45-degree miter joint to improve the mechanical strength of the connection.

[0032] The application will be further described below in connection with specific examples.

[0033] As shown in Figure 1 , Figure 2 and Figure 3 , the split-core three-phase HDT of the present application comprises a transformer and a converter, the main transformer comprises windings and a core, and the converter comprises a voltage compensation module CV SE , a current compensation module CV SH and a DC bus capacitor 14.

[0034] The transformer windings comprise an A-phase network-side winding W 1A , a B-phase network-side winding W 1B , a C-phase primary winding W 1C , an A-phase load winding W 2a , a B-phase load winding W 2b , a C-phase load winding W 2c , an A-phase voltage-regulating winding W 3a , a B-phase voltage-regulating winding W 3b and a C-phase voltage-regulating winding W 3c . The first / last ends of the three-phase network-side windings are A / X, B / Y and C / Z in sequence, the first / last ends of the three-phase load windings are a2 / x2, b2 / y2 and c2 / z2 in sequence, and the first ends of the three-phase voltage-regulating windings are a3 / x3, b3 / y3 and c3 / z3 in sequence. The first ends of the network-side windings, the load windings and the voltage-regulating windings are defined as the same-named ends.

[0035] The network-side windings are connected to the 10kV distribution network in a delta connection, specifically: the first ends A, B and C of the three-phase primary windings W 1A , W 1B and W 1C are connected to the power grid, and the last ends X, Y and Z are connected to phases B, C and A, respectively, thereby forming a delta connection. The load windings W 2a , W 2b , W 2c and the voltage-regulating windings W 3a , W 3b and W 3c are all connected in a star connection with the neutral point, specifically: W 2a , W 2b , W 2c , W 3a , W 3b and W 3cThe ends x2, y2, z2, x3, y3, z3 of the three-phase transformer are connected together to form a neutral point (N) Figure 1 The three-phase transformer is connected to the split capacitor midpoint n, thereby enabling three-phase independent control.

[0036] In Figure 1 , the voltage compensation module CV SE of the three-phase transformer is directly connected to the voltage regulating winding W 3a 3b 3c The first ends a3, b3, c3 of the three-phase current compensation module CV SH are connected to the voltage regulating winding W 2a 2b 2c In addition, a2, b2, c2 are mainly responsible for connecting the distribution network load.

[0037] As shown in Figure 1 and Figure 3 , the core of the split core three-phase HDT is composed of a main core column 10, a voltage regulating core column 11, and an upper / lower yoke. The main core column includes A-phase main core column 10a, B-phase main core column 10b, and C-phase main core column 10c. The voltage regulating core column includes A-phase voltage regulating core column 11a, B-phase left voltage regulating core column 11b1, B-phase right voltage regulating core column 11b2, and C-phase voltage regulating core column 11c. The yoke includes an upper yoke 12 and a lower yoke 13. The three-phase main core column and voltage regulating core column 10a, 11a, 11b1, 10b, 11b2, 11c, 10c are arranged in parallel from left to right, showing a longitudinal distribution. Their upper ends and lower ends are connected to the upper yoke 12 and the lower yoke 13 in turn.

[0038] As shown in Figure 1 and Figure 2 , each phase of the network side winding W 1a , W 1b , W 1c , the load winding W 2a , W 2b , W 2c , and the voltage regulating winding W 3a , W 3b , W 3c adopt a layered structure. The load winding W 2a , W 2b , W 2c is wound on the main core column 10a, 10b, 10c, respectively. The voltage regulating winding W 3a , W 3b1 , W 3b2 , W 3c ​​​​The windings are respectively wound on control core posts 11a, 11b1, 11b2, and 10c, and the grid-side windings are simultaneously wound on the outside of the load winding and the voltage regulating winding, thus linking the magnetic flux of the main core post and the voltage regulating core post. Specifically, W 1A Package in W 2a With W 3a outer side, W 1B Package in W 3b1 W 2b With W 3b2 The outside, and W 1C Package in W 2c With W 3c On the outer side, the B-phase voltage regulating core columns (11b1 and 11b2) are symmetrically arranged around the main core column 10b, and their cross-section is half that of the A / C phase voltage regulating core columns 11a and 11c. The B-phase voltage regulating winding consists of two windings with equal turns (W... 3b1 W 3b2 It is composed of series windings, and its number of turns is W of the A / C phase voltage regulating winding. 3a With W 3c Half of it.

[0039] When the grid-side winding voltage fluctuates, W 1A W 1B W 1C The total magnetic flux will inevitably fluctuate, and the local control system can issue a compensation command to control the voltage compensation converter CV. SE In the voltage regulating winding W 3a W 3b1 W 3b2 W 3c By injecting excitation current, the magnetic flux in the voltage regulating iron core columns (11a, 11b1, 11b2, 11c) can be actively controlled. Through the magnetic flux coupling of the layered windings, W can be canceled. 1A W 1B W 1C Real-time fluctuations in total magnetic flux. In this way, the magnetic flux of the main core columns 10a, 10b, and 10c can ultimately be kept constant, thereby maintaining the load winding W. 2a W 2b W 2c The voltage is stable.

[0040] Load winding W 2a W 2b W 2c The load is powered by a three-phase four-wire system, with a current compensation module CV. SH It is connected in parallel with the load. When harmful components such as harmonics, reactive power, or asymmetry appear in the load current, the current compensation module CV... SH It can actively generate an opposite suppressing current, thereby maintaining the injection current into the transformer load winding W. 2a W2b , W 2c and the net side winding W 1A , W 1B , W 1C The current of the net side winding W

[0041] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specified. In the description of the present application, "above" or "below" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature therebetween.

[0042] In the description of the present application, "above", "over" and "on" of a first feature to a second feature include that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher in level than the second feature.

[0043] In the description of the present application, it is to be understood that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] While the embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary and are not to be taken as limiting the scope of the application. The scope of the application is defined by the claims and their equivalents.

[0046] The above description is merely illustrative of the application, and is not to be taken as limiting the scope of the application. Various modifications and changes can be made by those skilled in the art which will comply with the principles of the application without departing from the spirit and scope of the application as defined by the following claims.

Claims

1. A split core type three-phase hybrid distribution transformer based on flux regulation, characterized in that, The three-phase main core column, the three-phase voltage regulation core column, the winding, the upper iron yoke and the lower iron yoke are included. Each phase voltage regulation core column is arranged beside the corresponding phase main core column, and the upper ends of the main core column and the voltage regulation core column are connected with the upper iron yoke, and the lower ends are connected with the lower iron yoke. The winding is divided into a grid-side winding, a load winding and a voltage regulation winding; the load winding is wound around the main core column of the phase, the voltage regulation winding is wound around the voltage regulation core column of the phase, and the grid-side winding is wound outside the load winding and the voltage regulation winding of the same phase. The load winding and the voltage regulation winding are used for connecting the converter; the converter includes a current compensation converter, a voltage compensation converter and a DC bus split capacitor in parallel; the neutral points of the load winding and the voltage regulation winding are connected with the midpoint of the DC bus split capacitor.

2. A split core three-phase hybrid distribution transformer based on flux regulation of voltage as claimed in claim 1, wherein, The winding is a layer winding.

3. The split core three-phase hybrid distribution transformer based on flux regulation according to claim 1, characterized in that, The three-phase main core column includes an A-phase main core column, a B-phase main core column and a C-phase main core column; the three-phase voltage regulation core column includes an A-phase voltage regulation core column, two B-phase voltage regulation core columns and a C-phase voltage regulation core column. The A-phase voltage regulation core column is arranged beside the A-phase main core column, the two B-phase voltage regulation core columns are arranged on the two sides of the B-phase main core column respectively, and the C-phase voltage regulation core column is arranged beside the C-phase main core column.

4. The split core three-phase hybrid distribution transformer based on flux regulation according to claim 3, characterized in that, The cross-sectional areas of the A-phase voltage regulation core column and the C-phase voltage regulation core column are equal; the cross-sectional area of the B-phase voltage regulation core column is half of the cross-sectional area of the A-phase voltage regulation core column, and the sum of the cross-sectional areas of the two B-phase voltage regulation core columns is equal to the cross-sectional area of the A-phase voltage regulation core column.

5. The split core three-phase hybrid distribution transformer based on flux regulation according to claim 3, characterized in that, The voltage regulation winding of the B-phase is composed of two sub-voltage regulation windings with equal number of turns in series, and the two sub-voltage regulation windings are wound on the B-phase voltage regulation core columns on the two sides of the B-phase respectively.

6. The split core three-phase hybrid distribution transformer based on flux control voltage regulation as claimed in claim 3 wherein, The cross-sectional area of the A-phase main core column is greater than the cross-sectional area of the A-phase voltage regulation core column, the cross-sectional area of the B-phase main core column is greater than the sum of the cross-sectional areas of the two B-phase voltage regulation core columns, and the cross-sectional area of the C-phase main core column is greater than the cross-sectional area of the C-phase voltage regulation core column.

7. The split core three-phase hybrid distribution transformer based on flux control voltage regulation as claimed in claim 1 wherein, The grid-side winding is connected to the power grid in a delta connection, the load winding is connected to the load in a star connection with a neutral point, and the voltage regulation winding is connected to the converter in a star connection with a neutral point.

8. The split core three-phase hybrid distribution transformer based on flux control voltage regulation as claimed in claim 1 wherein, The main core column and the voltage regulation core column of each phase are connected with the iron yokes on the two sides through 45-degree bevel joints.

9. The split core three-phase hybrid distribution transformer based on flux control voltage regulation as claimed in claim 1 wherein, The magnetic flux of the grid-side winding of each phase is equal to the sum of the magnetic fluxes of the main core column and the voltage regulation core column of each phase.

10. The split core three-phase hybrid distribution transformer based on flux control voltage regulation as claimed in claim 1 wherein, The voltage compensation converter regulates the magnetic flux of the voltage regulation core column through the voltage regulation winding, so that the magnetic flux of the main core column remains unchanged; the current compensation converter is connected with the load winding in parallel.

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