adding transformer

Abstract

The embodiment of the application provides a kind of additive transformer, it is related to electronic power technical field.The additive transformer includes: multiple ring conductors;Multiple groups of input windings, corresponding to the ring conductor one by one, the ring conductor penetrates the first axial cavity of the input winding;Output winding, multiple ring conductors all penetrate the second axial cavity of the output winding, and multiple ring conductors do not intersect each other.The adder provided in the embodiment of the application expands capacity, provides multi-stage voltage output, flexibly adjusts current / voltage ratio, optimizes waveform and reduces voltage harmonic, improves the performance of additive transformer from multiple dimensions, realizes power supply demand under multiple working conditions, and provides reliable electric energy conversion for various high-power AC transmission devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic power, in particular to an additive transformer. BACKGROUND

[0002] With the continuous increase of energy power, rail transportation, large scientific devices, agriculture and residential electricity, the capacity of the power grid is rising, and the power supply capacity and voltage level of the transformer are also increasing. However, the capacity of the conventional dry-type transformer commonly used on the power supply side cannot be further improved, and it also does not have the function of increasing or decreasing voltage.

[0003] The capacity of the largest dry-type transformer in China is about 20 MVA, and the core and winding thereof cannot be further improved. The voltage level of the conventional transformer is fixed and cannot realize the increase or decrease of voltage. Limited by the existing manufacturing process, the core winding cannot be infinitely increased, resulting in that the capacity of the transformer is restricted. In some high-power electromagnetic propulsion fields, the capacity is tens of megawatts or even gigawatts, and the existing dry-type transformer cannot meet the demand of technological progress.

[0004] Therefore, there is an urgent need for a dry-type transformer with capacity expansion and voltage adjustment. SUMMARY

[0005] In order to solve the above technical problems, an additive transformer is provided in the embodiments of the present application to solve the above technical problems.

[0006] In a first aspect, the present application provides an additive transformer, comprising:

[0007] a plurality of ring conductors;

[0008] a plurality of groups of input windings corresponding one-to-one to the ring conductors, the ring conductors penetrating first axial cavities of the input windings;

[0009] an output winding, the plurality of ring conductors penetrating second axial cavities of the output winding and not intersecting each other.

[0010] In an optional embodiment of the present application, the ring conductors are symmetric polygons.

[0011] In an optional embodiment of the present application, the output winding is a multi-tap winding.

[0012] In an optional embodiment of the present application, the plurality of ring conductors are uniformly arranged along the axial center axis of the output winding.

[0013] In an optional embodiment of the present application, the input windings and the output winding are obtained by winding copper foil.

[0014] In an optional embodiment of the present application, the ring conductor is a single-phase core.

[0015] In an optional embodiment of the present application, the ring conductor is made of silicon steel material.

[0016] In an optional embodiment of the present application, the silicon steel material is a silicon steel material with polarity orientation.

[0017] In an optional embodiment of the present application, the adder transformer further comprises:

[0018] The support frame comprises a plurality of support sub-mechanisms for supporting the plurality of input windings and / or the plurality of ring conductors.

[0019] In an optional embodiment of the present application, the input currents of the input windings are not completely the same.

[0020] In the first aspect, please continue to refer to Figure 2 and Figure 3 When the three groups of input winding voltage modulation waves are different: the input modulation wave of the first input winding is 0.8V, the input modulation wave of the second input winding is 0.6V, and the input modulation wave of the third input winding is 1V, the output voltage of the output winding is 0.8+0.6+1=2.4V; that is, the input multiphase superposition is realized, and the purpose of obtaining a larger capacity output is achieved.

[0021] Please continue to refer to Figure 4 , Figure 4 The carrier phase-shifted generated waveform diagram of the adder transformer of the embodiment of the present application when two inputs (i.e., the input windings are two groups) is as follows, Figure 4 (a) and Figure 4 (b) are input voltage waveform diagrams of the two input windings, respectively, Figure 4 (c) is a voltage waveform diagram output by the output winding, from which it can be clearly seen that the voltage u is superimposed to twice the input, thereby realizing the superposition and increase of the capacity.

[0022] In the second aspect, for example, when two of the three input voltages are positive and the other is negative, the voltage effect of 2-1=1 is realized, thereby the adder transformer can meet various power demands under the flexible control mode thereof, and the purpose of flexible adjustment of the input regulated voltage output is achieved.

[0023] In the third aspect, since the adder transformer provided by the embodiment of the present application has a plurality of input windings, the non-pole voltage regulation effect can be realized by different modulation ratios of the input voltages in the plurality of input windings; at the same time, the increase and decrease of the magnetic flux can also be realized by changing the direction of the input modulation wave of the plurality of input windings, based on the multiple input single-phase output form, the multiple voltage grade output of the transformer and the expansion of the capacity are realized, and the purpose of diversification of the input regulated voltage output is achieved.

[0024] In a fourth aspect, the carrier phase shift can not only effectively improve the sinusoidal degree of the waveform, but also can realize the stepless regulation of the voltage. Assuming that the output of the output winding under a single input winding is a unit value 1, the stepless voltage regulation of the transformer is realized by controlling the modulation wave size adjustment, the regulation from zero to rated voltage is realized, and the capacity expansion of the transformer is realized.

[0025] In a fifth aspect, referring to Figure 4 When the adder transformer provided by the embodiment of the present application is two inputs, the traditional method is to increase the PWM waveform amplitude u by one time. In the present patent, the carrier phase shift control method is adopted when the input PWM is used. The multi-level ladder wave is formed by carrier phase shift, so that the output waveform is closer to the sine wave, the system voltage harmonic is reduced, and the system operation efficiency is improved.

[0026] In summary, the adder provided by the embodiment of the present application expands the capacity, provides multi-level voltage output, flexibly adjusts the current / voltage ratio, optimizes the waveform to reduce the voltage harmonic, and improves the performance of the adder transformer from multiple dimensions, realizes the power supply demand under multiple working conditions, and provides reliable power conversion for various high-power AC transmission devices.

[0027] Especially under the premise of considering economy, the traditional multi-output transformer is not suitable for configuring intelligent detection equipment due to its large number, while the adder provided by the embodiment of the present application can be equipped with intelligent health detection equipment due to its integration and magnetic flux addition characteristics, and has functions such as temperature detection, partial discharge detection, voltage and current imbalance detection, smoke detection, etc., realizing the intelligent health detection of the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 It is a schematic diagram of the topology structure of the traditional output transformer;

[0030] Figure 2 It is a schematic diagram of the structure of the adder transformer provided by the embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of the winding structure comparison between the traditional output transformer and the adder transformer provided by the embodiment of the present application;

[0032] Figure 4 It is a carrier phase shift generated waveform diagram when the input winding of the adder transformer provided by the embodiment of the present application is two inputs (i.e. the input winding is 2 groups); wherein, Figure 4(a) and Figure 4 (b) is an input waveform graph of the input winding, Figure 4 (c) is an output waveform graph of the output winding after superimposing each input winding.

[0033] Wherein:

[0034] 10, the adder transformer; 100, the input winding; 200, the output winding; 300, the ring conductor. DETAILED DESCRIPTION

[0035] At present, the largest capacity of the dry-type transformer in China is about 20 MVA, and the core and winding thereof cannot be further improved. Please refer to Figure 1 , Figure 1 The common multi-split transformer topology is shown in the figure, which provides a front-stage voltage conversion and isolation for a high-voltage frequency converter, and the capacity reaches the megawatt level through the design of multiple split windings. The multi-split transformer realizes phase shifting through the extended delta triangle and multiple windings share one core, thereby realizing multi-pulse rectification of the frequency converter. The traditional dry-type transformer has the following defects:

[0036] (1) Large core volume and complex winding: Although the multi-split transformer adopts the multi-split winding form to increase the capacity of the transformer, the core volume is large as the capacity increases. In order to realize multi-pulse rectification, the split winding needs to be phase-shifted at different angles through the extended delta triangle, and the design and manufacturing process are complex.

[0037] (2) Fixed output voltage: The voltage level of the traditional transformer is fixed and cannot be increased or decreased.

[0038] (3) Difficulty in capacity improvement: Due to the existing manufacturing process, the core winding cannot be infinitely increased, which restricts the capacity of the transformer.

[0039] In some high-power electromagnetic propulsion fields, the capacity is tens of megawatts or even gigawatts, and the existing dry-type transformer cannot meet the needs of technological progress.

[0040] Therefore, there is an urgent need for a dry-type transformer with expanded capacity and adjustable voltage.

[0041] In view of the above problems, an adder transformer is provided in the embodiments of the present application to provide a kind of. In order to make the purpose, technical scheme and advantages of the present application more clear and clear, the following through embodiment, and combining with the drawings, the adder transformer of the present application is further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0042] The serial numbers of components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and have no technical meaning. Unless otherwise specified, "connection" and "coupling" in this application include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this 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 a limitation on this application.

[0043] In this application, unless otherwise expressly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0044] With the continuous increase of energy power, rail transportation, large scientific devices, agriculture and residential electricity, the capacity of the power grid is continuously rising, and the power supply capacity and voltage level of the transformer are also increasing. However, the capacity of the conventional dry-type transformer commonly used on the power supply side cannot be further improved, and it does not have the function of increasing or decreasing voltage.

[0045] Please refer to Figure 2 and Figure 3 The embodiment of the application provides an additive transformer 10, which comprises a ring conductor 300, an input winding 100 and an output winding 200, wherein:

[0046] The number of the ring conductor 300 is multiple, and the ring conductor 300 is made of metal or conductive material such as graphite and is used as the core of the transformer. The ring conductor 300 is a closed ring and forms a complete loop. In the working process, the magnetic flux can be generated by moving.

[0047] The plurality of input windings 100 correspond to the annular conductors 300 one by one, and the annular conductors 300 pass through the first axial cavities of the input windings 100. For example, there are three annular conductors 300, corresponding to three input windings 100. The input windings 100 can be wound by any metal wire such as copper, iron, aluminum, alloy, etc. For example, the input windings 100 can be wound by copper foil to reduce the skin effect of current, increase the current density, and improve the performance of the additive transformer 10. The input windings 100 have an axial cavity along the axial direction. A set of input windings 100 is sleeved in the annular conductor 300, partially overlaps, and does not completely cover all surfaces of the annular conductor 300. The input windings 100 are primary windings, which serve as current input in operation. The plurality of input windings 100 correspond to a plurality of current inputs. It should be explained that the number of turns of the input windings 100 can be fixed or adjustable, that is, the current and voltage input into the transformer can be flexibly adjusted by the number of turns. The number of turns and capacity of the plurality of input windings 100 can be the same or different, which is not limited in the embodiments of the present application and can be flexibly adjusted according to actual conditions.

[0048] The output windings 200 have a second axial cavity along the axial direction. The output windings 200 are sleeved in the annular conductors 300, partially overlap, and do not completely cover all surfaces of the annular conductors 300, that is, a set of annular conductors 300 is sleeved with at least one set of input windings 100 and output windings 200, and the input windings 100 and the output windings 200 do not intersect. For example, the input windings 100 and the output windings 200 sleeved on the same annular conductor 300 are parallel and axially symmetric along the annular conductor 300. The input windings 100 are secondary windings, which serve as a current output end in operation. The plurality of input windings 100 correspond to a plurality of current inputs, but the current output has only one end. It should be explained that the number of turns of the output windings 200 can be fixed or adjustable, that is, the current and voltage output from the transformer can be flexibly adjusted by the number of turns.

[0049] The following briefly introduces the working principle of the additive transformer 10 provided by the embodiments of the present application, taking the input windings 100 as three groups and the output windings 200 as one group.

[0050] The first aspect, please continue to see Figure 2 and Figure 3When the 3 groups of input windings 100 voltage modulation waves are different: the input modulation wave of the first input winding 100 is 0.8V, the input modulation wave of the second input winding 100 is 0.6V, and the input modulation wave of the third input winding 100 is 1V, the output voltage of the output winding 200 is 0.8+0.6+1=2.4V; that is, the input multiphase superposition is realized, and the purpose of obtaining a larger capacity output is achieved.

[0051] Please continue to see Figure 4 , Figure 4 The carrier phase shift generation waveform diagram of the adder transformer 10 of the embodiment of the present application is as follows when two inputs (that is, the input windings 100 are 2 groups) are added, Figure 4 (a) and Figure 4 (b) are the input voltage waveform diagrams of the two input windings 100, respectively, Figure 4 (c) is the voltage waveform diagram of the output of the output winding 200, from which it can be clearly seen that the voltage is superimposed to twice the input, thereby realizing the superposition and increase of the capacity.

[0052] In the second aspect, for example, when two of the three input voltages are positive and the other is negative, the voltage effect of 2-1=1 is realized, and thus the adder transformer 10 can meet various power consumption demands under the flexible control mode thereof, and the purpose of flexible adjustment of the output through input adjustment of the voltage is achieved.

[0053] In the third aspect, since the adder transformer 10 provided by the embodiment of the present application has multiple input windings 100, the stepless voltage regulation effect can be achieved through different modulation ratios of the input voltages in the multiple input windings 100; at the same time, the increase and decrease of the magnetic flux can also be achieved through the change of the direction of the input modulation wave of the multiple input windings 100, based on the multiple input single-phase output form, the multiple voltage grade outputs and the capacity expansion of the transformer are realized, and the purpose of diversification of the output through input adjustment of the voltage is achieved.

[0054] In the fourth aspect, the carrier phase shift not only can effectively improve the sinusoidal degree of the waveform, but also can realize stepless regulation of the voltage; assuming that the output of the output winding 200 under a single input winding 100 is a unit value of 1, the stepless voltage regulation of the transformer is realized through the control of the modulation wave size adjustment, the adjustment from zero to the rated voltage is realized, and the capacity expansion of the transformer is realized.

[0055] In the fifth aspect, please see Figure 4 When the multiple input windings 100 are connected to the frequency converter, the layering carrier output is realized through the carrier phase shift, for example, when the adder transformer 10 provided by the embodiment of the present application is two inputs, the traditional mode is to increase the PWM waveform amplitude by one time, the carrier phase shift control mode is adopted when the input PWM of the present patent, the multi-level ladder wave is formed through the carrier phase shift, the output waveform is closer to the sine wave, the system voltage harmonic is reduced, and the system operation efficiency is improved.

[0056] In summary, the adder provided by the embodiment of the application can expand the capacity, provide multi-stage voltage output, flexibly adjust the current / voltage ratio, optimize the waveform, reduce the voltage harmonic, and improve the performance of the adder transformer 10 from multiple dimensions to meet the power supply requirements in multiple working conditions and provide reliable power conversion for various high-power AC transmission devices.

[0057] Especially under the premise of considering economy, the traditional multi-output transformer is not suitable for configuring intelligent detection equipment due to the large number of transformers, while the adder transformer 10 provided by the embodiment of the application can be equipped with intelligent health detection equipment due to its integration and magnetic flux addition characteristics, and has functions such as temperature detection, partial discharge detection, voltage and current imbalance detection, and smoke detection, thereby realizing intelligent health detection of the transformer.

[0058] In an optional embodiment of the application, the annular conductor 300 is a symmetrical polygon, which can be set as a quadrilateral, for example, and has high stability in structure installation and placement.

[0059] In an optional embodiment of the application, the output winding 200 is a multi-tap winding. That is, the output winding 200 includes multiple taps, and the number of turns of the output winding 200 is adjusted through the taps, as shown in the following figure. Figure 3 As shown in the figure, in the multi-output frequency conversion, the winding of the variable magnetic flux adder transformer 10 is magnetically coupled with all the secondary core, and compared with the series output of the secondary winding of the traditional transformer, the adder transformer 10 provided by the embodiment of the application does not have electrical connection, and better realizes electrical isolation of the device.

[0060] In an optional embodiment of the application, the multiple annular conductors 300 are uniformly arranged along the axis of the output winding 200 in an axisymmetric manner, so that the generated magnetic field and the magnetic flux in the magnetic field are more uniform, the magnetic flux of adjacent annular conductors 300 is also more uniform, and the adder transformer 10 provided by the embodiment of the application works more stably.

[0061] In an optional embodiment of the application, the input winding 100 and the output winding 200 are both wound by copper foil. The copper foil winding method can reduce the skin effect of the current, increase the current density, and improve the working efficiency and performance of the adder transformer 10 of the embodiment of the application.

[0062] In an optional embodiment of the application, the annular conductor 300 is a single-phase core, that is, the multiple single-phase cores are combined to realize the input of multiple-phase superposition, and the purpose of obtaining larger capacity output is achieved.

[0063] In an optional embodiment of the present application, the annular conductor 300 is made of silicon steel material. The silicon steel material is a silicon steel material with polarity orientation. The silicon steel material with polarity orientation has low hysteresis loss relative to iron material, which can further improve the working performance and working efficiency of the adder transformer 10.

[0064] In an optional embodiment of the present application, the adder transformer 10 further comprises a support frame. The support frame comprises a plurality of support sub-mechanisms for supporting the plurality of input windings 100 and / or the plurality of annular conductors 300, so as to improve the structural stability of the adder transformer 10.

[0065] In an optional embodiment of the present application, the input currents of the input windings 100 are not completely the same. For example, the input windings 100 are single-phase alternating current inputs with the same phase. According to the power capacity, single input, double input, …, N input can be realized, which effectively increases the flexible configuration of the power capacity of the adder transformer and improves the expansibility and flexibility of the input and output voltage or current.

[0066] It should be understood that, although the steps in the flowchart are shown in a sequential order following the arrows, the steps are not necessarily executed in the order shown by the arrows. Unless otherwise specified herein, the steps are not necessarily executed in a strict order, and the steps can be executed in other orders. Moreover, at least some of the steps in the figure can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of the sub-steps or stages is not necessarily sequential, but can be round-robin or alternating with at least some of the other steps or sub-steps or stages of other steps.

[0067] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but it should be considered that any combination of the technical features is within the scope of the present disclosure.

[0068] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be considered as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An adding transformer characterized by, The utility model relates to a kind of multi-phase transformer, including: Multiple annular conductors; Multiple groups of input windings, corresponding to the annular conductors one by one, the annular conductors pass through the first axial cavity of the input winding; Output winding, multiple annular conductors pass through the second axial cavity of the output winding, and multiple annular conductors do not intersect with each other; The annular conductor is a symmetrical polygon;The output winding is a multi-tap winding;Multiple annular conductors are uniformly arranged along the axial symmetry of the output winding;The annular conductor is a single-phase core;The input current of the input winding is not completely the same, realizes the purpose of input multi-phase superposition and flexible adjustment of voltage output through input adjustment; Multiple groups of input windings realize layering carrier wave output through carrier wave phase shift when accessing frequency converter, so that output waveform is closer to sine wave, reduces system voltage harmonic, improves system operation efficiency.

2. The adding transformer according to claim 1, characterized in that, The input winding and the output winding are wound by copper foil.

3. The adding transformer according to claim 1, characterized in that, The annular conductor is made of silicon steel material.

4. The adding transformer according to claim 3, characterized in that, The silicon steel material adopts silicon steel material with polarity orientation.

5. The adding transformer according to claim 1, characterized in that, Also includes: Support frame, including multiple support sub-mechanisms, respectively for supporting multiple input windings and / or multiple annular conductors.

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