Variable frequency operation transformer device

Abstract

The application discloses a variable frequency operation transformer device, which comprises a base frame, a first transformer module, a second transformer module, a reactance module and a switching conversion module; the first transformer winding comprises a first winding unit, a second winding unit and a first switching unit, the first switching unit is connected with the first winding unit and the second winding unit respectively, the first switching unit has at least a first working state and a second working state, the second transformer winding is coupled with the first transformer winding, the second transformer winding comprises a third winding unit, a fourth winding unit and a second switching unit, the second switching unit is connected with the third winding unit and the fourth winding unit respectively, the second switching unit has at least a third working state and a fourth working state, the switching conversion unit is connected with the reactor and the second transformer winding respectively, and the switching conversion unit has at least a fifth working state and a sixth working state; the design is convenient to construct and maintain, saves the occupied area and reduces the construction and maintenance cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power equipment, in particular to a variable-frequency operation transformer device. BACKGROUND

[0002] The transformer device in the field of electric power is mainly used for converting the electric energy generated by a generator set into a voltage level suitable for grid connection or storage, and can be compatible with power grid environments at various frequencies to provide a wider range of application scenarios, such as being applied in the fields of wind power generation, photovoltaic power generation, etc.

[0003] However, taking offshore wind power facilities as an example, the offshore and land areas usually widely use a 50Hz power system, while the medium and far seas of 70-200km use a 16.7-20Hz low-frequency power system, the transformer devices used in the two power systems are different, and are affected by the line frequency, and cannot be used universally, so different transformer devices need to be configured in advance during construction and maintenance, the offshore environment is relatively harsh, the maintenance cost is high, the different transformer devices in different sea areas increase the maintenance cost, and also increase the workload of maintenance personnel. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a variable-frequency operation transformer device, which is convenient to construct and maintain, saves land area, reduces construction and maintenance cost and workload, and improves the stability and reliability of the power system.

[0005] The variable frequency operation transformer device according to the first aspect of the present application comprises a base frame, a first transformer module arranged on the base frame, the first transformer module comprising a first transformer winding, the first transformer winding comprising a first winding unit, a second winding unit and a first switching unit, the first switching unit being connected with the first winding unit and the second winding unit respectively, the first switching unit having at least a first working state and a second working state and being capable of switching between the first working state and the second working state, wherein in the first working state, the first winding unit and the second winding unit are connected in series, and in the second working state, the first winding unit and the second winding unit are connected in parallel; a second transformer module arranged on the base frame, the second transformer module comprising a second transformer winding, the second transformer winding and the first transformer winding being coupled with each other, the second transformer winding comprising a third winding unit, a fourth winding unit and a second switching unit, the second switching unit being connected with the third winding unit and the fourth winding unit respectively, the second switching unit having at least a third working state and a fourth working state and being capable of switching between the third working state and the fourth working state, wherein in the third working state, the third winding unit and the fourth winding unit are connected in series, and in the fourth working state, the third winding unit and the fourth winding unit are connected in parallel; a reactance module and a switching conversion module, both arranged on the base frame, the reactance module comprising a reactor, the switching conversion module comprising a switching conversion unit, the switching conversion unit being connected with the reactor and the second transformer winding respectively, the switching conversion unit having at least a fifth working state and a sixth working state and being capable of switching between the fifth working state and the sixth working state, wherein in the fifth working state, the reactor and the second transformer winding are connected, and in the sixth working state, the reactor and the second transformer winding are disconnected.

[0006] The variable frequency operation transformer device according to the present application has at least the following beneficial effects:

[0007] The variable frequency operation transformer device of the application can realize the transformation of the number of turns of the winding, the second switching unit can switch the third winding unit and the fourth winding unit between the series and parallel states, and the transformation of the number of turns of the winding can also be realized, while the second transformer winding and the first transformer winding are coupled to each other, the transformation of the number of turns can change the voltage level of the transformer, to adapt to different voltage transformation requirements, different voltage level transformations are compatible with the power system of the power frequency and the low frequency, to realize free conversion, in addition, in the application scenario of the low frequency, the reactor in the reactance module can be connected to the second transformer winding through the switching and conversion unit, to effectively increase the impedance, to meet the demand of the power system in the low frequency environment, while in the application scenario of the power frequency, the reactor can be switched out, the design is convenient to construct and maintain, saves the occupied area, reduces the construction and maintenance cost and the workload, and the transformer device maintains stable performance output, and improves the reliability of the power system.

[0008] According to some embodiments of the application, the first transformer winding, the second transformer winding, the reactor and the switching and conversion unit each include three, the first transformer winding and the second transformer winding are coupled one by one, and the switching and conversion unit is connected one by one with the second transformer winding and the reactor respectively.

[0009] According to some embodiments of the application, the three first transformer windings are connected in a triangle.

[0010] According to some embodiments of the application, the three second transformer windings are connected in a star.

[0011] According to some embodiments of the application, the first switching unit includes a first switching switch and a second switching switch, the first switching switch includes a first connection end, a second connection end and a third connection end, the second switching switch includes a fourth connection end and a fifth connection end, the first connection end is connected with the first end of the first winding unit, the second connection end is connected with the first end of the second winding unit, the third connection end is connected with the fifth connection end and the tail end of the first winding unit respectively, the fourth connection end is connected with the tail end of the second winding unit, in the first working state, the first connection end and the second connection end are closed, the second connection end and the third connection end are disconnected, and the fourth connection end and the fifth connection end are closed; in the second working state, the first connection end and the second connection end are disconnected, the second connection end and the third connection end are closed, and the fourth connection end and the fifth connection end are disconnected.

[0012] According to some embodiments of the present application, the first variable voltage winding further comprises a voltage regulating winding, the voltage regulating winding comprises a plurality of coil units connected in series, a first end of the voltage regulating winding, a second end of the voltage regulating winding and two adjacent coil units are provided with voltage regulating terminals, the second winding unit is connected to the first end or the second end of the voltage regulating winding, and an intermediate tap is provided on the voltage regulating winding, the intermediate tap is capable of being connected to any one of the voltage regulating terminals.

[0013] According to some embodiments of the present application, the first variable voltage winding further comprises a tapping conversion unit, the tapping conversion unit is connected to the second end of the second winding unit, the first end of the voltage regulating winding and the second end of the voltage regulating winding respectively, the tapping conversion unit has at least a seventh working state and an eighth working state and is capable of switching between the seventh working state and the eighth working state, in the seventh working state, the second end of the second winding unit is connected to the first end of the voltage regulating winding, and in the eighth working state, the second end of the second winding unit is connected to the second end of the voltage regulating winding.

[0014] According to some embodiments of the present application, the second switching unit comprises a third switching switch and a fourth switching switch, the third switching switch comprises a sixth connection end, a seventh connection end and an eighth connection end, the fourth switching switch comprises a ninth connection end and a tenth connection end, the sixth connection end is connected to the first end of the third winding unit, the seventh connection end is connected to the first end of the fourth winding unit, the eighth connection end is connected to the tenth connection end and the second end of the third winding unit respectively, the ninth connection end is connected to the second end of the fourth winding unit, in the third working state, the sixth connection end and the seventh connection end are closed, the seventh connection end and the eighth connection end are disconnected, and the ninth connection end and the tenth connection end are closed; in the fourth working state, the sixth connection end and the seventh connection end are disconnected, the seventh connection end and the eighth connection end are closed, and the ninth connection end and the tenth connection end are disconnected.

[0015] According to some embodiments of the present application, the switching conversion unit comprises a switching switch, the switching switch comprises a first gate, a second gate and a third gate, the first gate is connected to the second end of the fourth winding unit and the first end of the reactor respectively, the second gate is connected to the second end of the reactor, in the fifth working state, the third gate is connected to the second gate, and in the sixth working state, the third gate is connected to the first gate.

[0016] According to some embodiments of the present application, the variable frequency operation transformer device further comprises a control module, the control module is connected to the first switching unit, the second switching unit and the switching conversion unit respectively to control the switching states of the first switching unit, the second switching unit and the switching conversion unit respectively.

[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below in the description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0019] Figure 1 is a top view of one embodiment of a variable frequency operation transformer device of the present application;

[0020] Figure 2 is a circuit principle structure diagram of a second transformer module of one embodiment of a variable frequency operation transformer device of the present application;

[0021] Figure 3 is a circuit principle structure diagram of a first transformer module of one embodiment of a variable frequency operation transformer device of the present application.

[0022] REFERENCE NUMERALS

[0023] base frame 100; first transformer winding 200; first winding unit 210; second winding unit 220; first switching unit 230; first switching switch 231; first connection terminal 232; second connection terminal 233; third connection terminal 234; second switching switch 235; fourth connection terminal 236; fifth connection terminal 237; second transformer module 300; third winding unit 310; fourth winding unit 320; second switching unit 330; third switching switch 331; sixth connection terminal 332; seventh connection terminal 333; eighth connection terminal 334; fourth switching switch 335; ninth connection terminal 336; tenth connection terminal 337; reactor 400; switching and converting unit 500; switching switch 510; first gate point 520; second gate point 530; third gate point 540; voltage regulating winding 600; coil unit 610; voltage regulating terminal 620; intermediate tap 630; tap converting unit 700; neutral line 800. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by like or similar reference numerals throughout the drawings. The embodiments described below are examples for explaining the present application, and should not be construed as limiting the present application.

[0025] In the description of the application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0026] In the description of the application, the meaning of one or more is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features or the order of the indicated technical features.

[0027] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0028] As Figure 1 - Figure 3As shown in the figure, the variable frequency operation transformer device according to the first aspect of the embodiment of the application comprises a base frame 100, a first transformer module, a second transformer module 300, a reactance module and a switching conversion module, the first transformer module is arranged on the base frame 100, the first transformer module comprises a first transformer winding 200, the first transformer winding 200 comprises a first winding unit 210, a second winding unit 220 and a first switching unit 230, the first switching unit 230 is connected with the first winding unit 210 and the second winding unit 220 respectively, the first switching unit 230 has at least a first working state and a second working state and can be switched between the first working state and the second working state, wherein in the first working state, the first winding unit 210 and the second winding unit 220 are connected in series, and in the second working state, the first winding unit 210 and the second winding unit 220 are connected in parallel, the second transformer module 300 is arranged on the base frame 100, the second transformer module 300 comprises a second transformer winding, the second transformer winding and the first transformer winding 200 are coupled with each other, the second transformer winding comprises a third winding unit 310, a fourth winding unit 320 and a second switching unit 330, the second switching unit 330 is connected with the third winding unit 310 and the fourth winding unit 320 respectively, the second switching unit 330 has at least a third working state and a fourth working state and can be switched between the third working state and the fourth working state, wherein in the third working state, the third winding unit 310 and the fourth winding unit 320 are connected in series, and in the fourth working state, the third winding unit 310 and the fourth winding unit 320 are connected in parallel, the reactance module and the switching conversion module are arranged on the base frame 100, the reactance module comprises a reactor 400, the switching conversion module comprises a switching conversion unit 500, the switching conversion unit 500 is connected with the reactor 400 and the second transformer winding respectively, the switching conversion unit 500 has at least a fifth working state and a sixth working state and can be switched between the fifth working state and the sixth working state, wherein in the fifth working state, the reactor 400 and the second transformer winding are connected, and in the sixth working state, the reactor 400 and the second transformer winding are disconnected.

[0029] As Figure 1 shown, the base frame 100 can comprise a base, the first transformer module, the second transformer module 300, the reactance module and the switching conversion module can be placed on the base, the number of turns of the first transformer winding 200 is more than the number of turns of the second transformer winding, the first transformer winding 200 can serve as a high-voltage side winding, and the second transformer winding serves as a low-voltage side winding, the first transformer winding 200 can be sleeved on the second transformer winding, the first switching unit 230, the second switching unit 330, the reactance module and the switching conversion module can be placed around the side of the first transformer winding 200 to facilitate wiring.

[0030] The variable frequency operation transformer device of the application can realize the transformation of the number of turns of the winding, the second switching unit 330 can switch the third winding unit 310 and the fourth winding unit 320 in series and parallel states, and the transformation of the number of turns of the winding can also be realized, and the second transformer winding and the first transformer winding 200 are coupled to each other, the transformation of the number of turns can change the voltage level of the transformer, to adapt to different voltage transformation requirements, different voltage level transformation is compatible with the power system of the power frequency and the low frequency, realizes the free conversion, in addition, in the application scene of the low frequency, the reactor 400 in the reactance module can be connected to the second transformer winding through the switching and conversion unit 500, effectively increases the impedance, meets the demand of the power system in the low frequency environment, and in the application scene of the power frequency, the reactor 400 can be switched out, the design is convenient for construction and maintenance, saves the occupied area, reduces the construction and maintenance cost and the workload, and the transformer device maintains stable performance output, improves the reliability of the power system.

[0031] In some embodiments of the application, as shown in Figure 1 Figure 3 The first transformer winding 200, the second transformer winding, the reactor 400 and the switching and conversion unit 500 all include three, the first transformer winding 200 and the second transformer winding are one-to-one coupled, and the switching and conversion unit 500 is one-to-one connected with the second transformer winding and the reactor 400 respectively.

[0032] In application to three-phase power system, three first transformer windings 200 and three second transformer windings are respectively connected to three-phase lines to realize three-phase transformation, three first transformer windings 200 can be arranged in a row, and each second transformer winding is one-to-one correspondingly sleeved on the first transformer winding 200.

[0033] In some embodiments of the application, as shown in Figure 3 The three first transformer windings 200 are connected in a triangle.

[0034] Specifically, the first end of the first first transformer winding 200 is connected with the tail end of the third first transformer winding 200, the tail end of the first first transformer winding 200 is connected with the first end of the second first transformer winding 200, and the tail end of the second first transformer winding 200 is connected with the first end of the third first transformer winding 200.

[0035] In some embodiments of the application, as shown in​Figure 2 As shown, the three second variable windings are connected in star.

[0036] Specifically, the variable device further comprises a neutral line 800, in the sixth working state of the switching and converting unit 500, the tail end of each second variable winding is directly connected with the neutral line 800, in the fifth working state of the switching and converting unit 500, the tail end of each second variable winding is connected with the neutral line 800 through the respective electric reactor 400.

[0037] In some embodiments of the present application, as shown in Figure 2 As shown, the first switching unit 230 comprises a first switching switch 231 and a second switching switch 235, the first switching switch 231 comprises a first connecting end 232, a second connecting end 233 and a third connecting end 234, the second switching switch 235 comprises a fourth connecting end 236 and a fifth connecting end 237, the first connecting end 232 is connected with the head end of the first winding unit 210, the second connecting end 233 is connected with the head end of the second winding unit 220, the third connecting end 234 is respectively connected with the fifth connecting end 237 and the tail end of the first winding unit 210, the fourth connecting end 236 is connected with the tail end of the second winding unit 220, in the first working state, the first connecting end 232 and the second connecting end 233 are closed, the second connecting end 233 and the third connecting end 234 are disconnected, the fourth connecting end 236 and the fifth connecting end 237 are closed; in the second working state, the first connecting end 232 and the second connecting end 233 are disconnected, the second connecting end 233 and the third connecting end 234 are closed, the fourth connecting end 236 and the fifth connecting end 237 are disconnected.

[0038] Specifically, the first switching switch 231 can comprise a conductive first blade movably arranged, in the first working state, the first blade is moved between the first connecting end 232 and the second connecting end 233 to connect the first connecting end 232 and the second connecting end 233 respectively, while in the second working state, the second blade is moved between the second connecting end 233 and the third connecting end 234 to connect the third connecting end 234 and the second connecting end 233 respectively.

[0039] The second switching switch 235 comprises a conductive second blade movably arranged, in the first working state, the second blade is moved between the fourth connecting end 236 and the fifth connecting end 237 to connect the fourth connecting end 236 and the fifth connecting end 237 respectively, in the second working state, the second blade is moved out of the fourth connecting end 236 and the fifth connecting end 237 to disconnect the fourth connecting end 236 and the fifth connecting end 237.

[0040] The first switch 231 and the second switch 235 have a linkage connected with the first blade and the second blade respectively, when the first blade is in the first working state, the second blade is also in the first working state, when the first blade is in the second working state, the second blade is also in the second working state.

[0041] In some embodiments of the present application, as shown in Figure 3 The first transformer winding 200 further comprises a voltage regulating winding 600, the voltage regulating winding 600 comprises a plurality of coil units 610 connected in series, voltage regulating ends 620 are arranged between the head end of the voltage regulating winding 600, the tail end of the voltage regulating winding 600 and adjacent two coil units 610, the tail end of the second winding unit 220 is connected with the head end of the voltage regulating winding 600 or the tail end of the voltage regulating winding 600, an intermediate tap 630 is arranged on the voltage regulating winding 600, and the intermediate tap 630 can be connected with any voltage regulating end 620.

[0042] Specifically, the number of turns of each coil unit 610 can be the same, partially the same and partially different, the voltage regulating end 620 can be a port capable of being detachably electrically connected with the intermediate tap 630, and a worker can selectively connect the intermediate tap 630 with the corresponding voltage regulating end 620 according to actual needs, that is, a corresponding number of coil units 610 can be connected into the circuit of the first winding unit 210 and the second winding unit 220, while the intermediate tap 630 is used to be connected with the first transformer winding 200 of another phase, of course, the intermediate tap 630 can also be selected to be connected with the voltage regulating end 620 of the head end or the tail end of the voltage regulating winding 600, and no coil unit 610 is selected to be connected, so that on-load regulation and no-excitation regulation are realized, the input and output voltages of the circuit are reasonably adjusted, and the power transmission efficiency is improved.

[0043] In some embodiments of the present application, the first transformer winding 200 further comprises a tapping conversion unit 700 connected with the tail end of the second winding unit 220, the head end of the voltage regulating winding 600 and the tail end of the voltage regulating winding 600, the tapping conversion unit 700 has at least a seventh working state and an eighth working state and can be switched between the seventh working state and the eighth working state, in the seventh working state, the tail end of the second winding unit 220 is connected with the head end of the voltage regulating winding 600, and in the eighth working state, the tail end of the second winding unit 220 is connected with the tail end of the voltage regulating winding 600.

[0044] Specifically, due to the characteristics of the winding direction of the coil unit 610, the directions of the induced voltages are different because the directions of the magnetic fluxes formed by the current flowing into the head end of the voltage regulating winding 600 and the current flowing into the tail end of the voltage regulating winding 600 are different, and thus the tap changing unit 700 can be switched between the seventh working state and the eighth working state to form voltages of two different directions, i.e., positive and negative, so as to widen the voltage modulation range.

[0045] The tap changing unit 700 can include a tap switch blade, one end of the tap switch blade being connected to the tail end of the second winding unit 220, and the other end of the tap switch blade being movable and connected between the head end and the tail end of the voltage regulating winding 600.

[0046] In some embodiments of the present application, as shown in Figure 2 The second switching unit 330 includes a third switching switch 331 and a fourth switching switch 335, the third switching switch 331 including a sixth connection end 332, a seventh connection end 333 and an eighth connection end 334, the fourth switching switch 335 including a ninth connection end 336 and a tenth connection end 337, the sixth connection end 332 being connected to the head end of the third winding unit 310, the seventh connection end 333 being connected to the head end of the fourth winding unit 320, the eighth connection end 334 being connected to the tenth connection end 337 and the tail end of the third winding unit 310 respectively, and the ninth connection end 336 being connected to the tail end of the fourth winding unit 320, in the third working state, the sixth connection end 332 and the seventh connection end 333 are closed, the seventh connection end 333 and the eighth connection end 334 are disconnected, and the ninth connection end 336 and the tenth connection end 337 are closed; in the fourth working state, the sixth connection end 332 and the seventh connection end 333 are disconnected, the seventh connection end 333 and the eighth connection end 334 are closed, and the ninth connection end 336 and the tenth connection end 337 are disconnected.

[0047] Specifically, the third switching switch 331 can include a conductive third blade movably arranged, in the third working state, the third blade is moved between the sixth connection end 332 and the seventh connection end 333 to connect the sixth connection end 332 and the seventh connection end 333 respectively, and in the fourth working state, the third blade is moved between the seventh connection end 333 and the eighth connection end 334 to connect the seventh connection end 333 and the eighth connection end 334 respectively.

[0048] The fourth switching switch 335 includes a conductive fourth blade movably arranged, in the third working state, the fourth blade is moved between the ninth connection end 336 and the tenth connection end 337 to connect the ninth connection end 336 and the tenth connection end 337 respectively, and in the fourth working state, the fourth blade is moved out of the ninth connection end 336 and the tenth connection end 337 to disconnect the ninth connection end 336 and the tenth connection end 337.

[0049] The third switch 331 and the fourth switch 335 also have linkage, the linkage is connected with the third blade and the fourth blade respectively, when the third blade is in the third working state, the fourth blade is also in the third working state, when the third blade is in the fourth working state, the fourth blade is also in the fourth working state.

[0050] In some embodiments of the present application, the switching and converting unit 500 comprises a switching switch 510, the switching switch 510 comprises a first blade point 520, a second blade point 530 and a third blade point 540, the first blade point 520 is connected with the tail end of the fourth winding unit 320 and the head end of the reactor 400 respectively, the second blade point 530 is connected with the tail end of the reactor 400, in the fifth working state, the third blade point 540 is connected with the second blade point 530, in the sixth working state, the third blade point 540 is connected with the first blade point 520.

[0051] Specifically, the switching switch 510 comprises a switching blade, one end of the switching blade is connected with the third blade point 540, the third blade point 540 can be connected with the neutral line 800, in the fifth working state, the current flows through the reactor 400 and the switching blade and then flows into the neutral line 800, in the sixth working state, the current directly flows through the switching blade from the first blade point 520 and then flows into the neutral line 800.

[0052] In some embodiments of the present application, the variable frequency operation transformer device further comprises a control module (not shown in the figure), the control module is connected with the first switching unit 230, the second switching unit 330 and the switching and converting unit 500 respectively to control the first switching unit 230, the second switching unit 330 and the switching and converting unit 500 to switch states respectively.

[0053] The control module can be selected in MCU or CPU and its attached circuit, the first switching unit 230, the second switching unit 330 and the switching and converting unit 500 can all be selected as electric control components, the control module can automatically control the first switching unit 230, the second switching unit 330 and the switching and converting unit 500 to switch working states according to control instructions.

[0054] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

[0055] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and application of the present application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the present application, which is defined by the following claims and their equivalents.

Claims

1. A variable frequency operation transformer device, characterized by, include: scaffolding; a first transformer module, disposed on the base frame, comprising a first transformer winding, the first transformer winding comprising a first winding unit, a second winding unit, and a first switching unit, the first switching unit being connected to the first winding unit and the second winding unit, respectively, the first switching unit having at least a first working state and a second working state and being switchable between the first working state and the second working state, wherein in the first working state, the first winding unit and the second winding unit are connected in series, and in the second working state, the first winding unit and the second winding unit are connected in parallel; a second transformer module, disposed on the base frame, the second transformer module including a second transformer winding, the second transformer winding and the first transformer winding being coupled to each other, the second transformer winding including a third winding unit, a fourth winding unit, and a second switching unit, the second switching unit being connected to the third winding unit and the fourth winding unit, respectively, the second switching unit having at least a third working state and a fourth working state and being switchable between the third working state and the fourth working state, wherein in the third working state, the third winding unit and the fourth winding unit are connected in series, and in the fourth working state, the third winding unit and the fourth winding unit are connected in parallel; A reactance module and a switching conversion module are both provided on the base frame, the reactance module includes a reactor, the switching conversion module includes a switching conversion unit, the switching conversion unit is connected to the reactor and the second transformer winding respectively, the switching conversion unit has at least a fifth working state and a sixth working state and can be switched between the fifth working state and the sixth working state, wherein in the fifth working state, the reactor and the second transformer winding are connected, and in the sixth working state, the reactor and the second transformer winding are disconnected; The first switching unit includes a first switching switch and a second switching switch, the first switching switch includes a first connection end, a second connection end, and a third connection end, the second switching switch includes a fourth connection end and a fifth connection end, the first connection end is connected to the head end of the first winding unit, the second connection end is connected to the head end of the second winding unit, the third connection end is respectively connected to the fifth connection end and the tail end of the first winding unit, and the fourth connection end is connected to the tail end of the second winding unit. In a first working state, the first connection end and the second connection end are closed, the second connection end and the third connection end are disconnected, and the fourth connection end and the fifth connection end are closed; in a second working state, the first connection end and the second connection end are disconnected, the second connection end and the third connection end are closed, and the fourth connection end and the fifth connection end are disconnected; The second switching unit comprises a third switching switch and a fourth switching switch, the third switching switch comprises a sixth connection end, a seventh connection end and an eighth connection end, the fourth switching switch comprises a ninth connection end and a tenth connection end, the sixth connection end is connected with the first end of the third winding unit, the seventh connection end is connected with the first end of the fourth winding unit, the eighth connection end is connected with the tenth connection end and the tail end of the third winding unit respectively, the ninth connection end is connected with the tail end of the fourth winding unit, in the third working state, the sixth connection end and the seventh connection end are closed, the seventh connection end and the eighth connection end are disconnected, and the ninth connection end and the tenth connection end are closed; in the fourth working state, the sixth connection end and the seventh connection end are disconnected, the seventh connection end and the eighth connection end are connected, and the ninth connection end and the tenth connection end are disconnected.

2. A variable frequency operating transformer device as claimed in claim 1, wherein: The first variable voltage winding, the second variable voltage winding, the electric reactor and the switching unit each comprise three, the first variable voltage winding and the second variable voltage winding are correspondingly coupled, and the switching unit is connected with the second variable voltage winding and the electric reactor respectively.

3. A variable frequency operating transformer device as defined in claim 1, wherein: The three first variable voltage windings are connected in a triangle shape.

4. A variable frequency operating transformer device as defined in claim 1, wherein: The three second variable voltage windings are connected in a star shape.

5. A variable frequency operating transformer device as defined in claim 1, wherein: The first variable voltage winding further comprises a voltage regulating winding, the voltage regulating winding comprises a plurality of coil units connected in series, a voltage regulating end is arranged between the first end of the voltage regulating winding, the tail end of the voltage regulating winding and adjacent two coil units, the tail end of the second winding unit is connected with the first end or the tail end of the voltage regulating winding, an intermediate tap is arranged on the voltage regulating winding, and the intermediate tap can be connected with any voltage regulating end.

6. A variable frequency operating transformer arrangement according to claim 5, characterised in that: The first variable voltage winding further comprises a tapping switching unit, the tapping switching unit is connected with the tail end of the second winding unit, the first end of the voltage regulating winding and the tail end of the voltage regulating winding respectively, and the tapping switching unit has at least a seventh working state and an eighth working state and can be switched between the seventh working state and the eighth working state, in the seventh working state, the tail end of the second winding unit is connected with the first end of the voltage regulating winding, and in the eighth working state, the tail end of the second winding unit is connected with the tail end of the voltage regulating winding.

7. A variable frequency operating transformer device as defined in claim 1, wherein: The switching unit comprises a switching switch, the switching switch comprises a first gate, a second gate and a third gate, the first gate is connected with the tail end of the fourth winding unit and the first end of the electric reactor respectively, and the second gate is connected with the tail end of the electric reactor, in the fifth working state, the third gate is connected with the second gate, and in the sixth working state, the third gate is connected with the first gate.

8. A variable frequency operating transformer device as defined in claim 1, wherein, A control module is further arranged, and the control module is connected with the first switching unit, the second switching unit and the switching unit respectively to control the switching states of the first switching unit, the second switching unit and the switching unit respectively.

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