DE102012110969A1 - Three-phase transformer system and network with such a three-phase transformer system - Google Patents

Abstract

The present invention relates to a three-phase transformer system comprising: a three-phase transformer unit (101), each single-phase transformer component (1) comprising: an iron core (10), a first low-voltage winding (11) and a second low-voltage winding (12) which are connected in parallel to one another said iron core (10) is arranged, said first low voltage winding (11) and said second low voltage winding (12) in said three phase transformer (101) being separately star connected; a high voltage winding (13) attached to said first low voltage winding (11) and said second low voltage winding (12); and a direct current supply (102), in which the positive pole (+) and the negative pole (-) each with the neutral point (O1) of the star-connected first low-voltage winding (11) and with the neutral point (O2) of the star-connected second low-voltage winding (12) are electrically connected. In the present invention, the magnetic saturation factor of the iron core (10) is changed by controlling the voltage of the DC power supply (102), so that the reactance of the three-phase transformer unit (101) is changed. In addition, a network with the aforementioned three-phase transformer system is specified in the present invention.

Description

Technical area

The present invention relates to a transformation technique, more particularly to a variable reactance three-phase transformer system and a network having such a three-phase transformer system.

State of the art

The transformer is a device, wherein the AC voltage is converted according to the principle of electromagnetic induction. The transformer essentially comprises a primary winding, a secondary winding and an iron core (magnetic core). The transformer is often used for voltage boosting or voltage reduction, transformer resistance adjustment and safe isolation, etc.

Normally, the reactance of the transformer is determined by its size and design. In the transformer of a certain type, its reactance is fixed. But it is necessary for the industry to develop a transformer with its reactance adjustable so that the induction current is introduced into the grid.

For example, in a wind generator or in the field of metallogy, it is necessary to dynamically regulate the power factor of the power line, so that it is necessary to additionally use a reactor such as a reactor. Shunt reactor, series reactor, smoothing reactor ...), to arrange separately to regulate the induction current of the network, thereby increasing the power factor. This inevitably leads to a considerable increase in costs.

Content of the invention

The object of the present invention is to solve at least one problem of the problems existing in the prior art to a certain extent.

The present invention is based on the first object to provide a three-phase transformer system, wherein the power factor of the power line is controlled in a dynamic manner, the voltage output of the network is stabilized and the investment costs are reduced.

In addition, in the present invention, it is necessary to specify a network, wherein the induction current is controllable in the network, and the power factor is increased.

In order to achieve the above-mentioned object, there is provided a three-phase transformer system in a first aspect of the embodiment of the present invention, the three-phase transformer system comprises a three-phase transforming unit, each single-phase transforming component comprising: an iron core; first and second low-voltage windings arranged in parallel to each other on the iron core, said first low-voltage winding and said second low-voltage winding being separately star-connected in said three-phase transforming unit; a high voltage winding attached to said first and second low voltage windings. The three-phase transformer system also includes a DC power supply, wherein the positive pole and the negative pole of said DC power supply are each electrically connected to the neutral point of the star-connected first and the star-connected second low-voltage winding.

In the three-phase transformer system according to the embodiment of the present invention, the magnetic saturation factor of the iron core of the three-phase transformer unit is changed by controlling the voltage of the DC power supply, so that the reactance of the three-phase transformer unit is changed to achieve the regulation of the reactance of the three-phase transformer. In the application, the three-phase transformer acts like the combination of the traditional three-phase transformer with a reactor, so that the industrial application costs are reduced.

In one embodiment of the present invention, the voltage of said DC power supply is controllable so that the reactance is adjustable as desired.

In one embodiment of the present invention, said first and said second low-voltage windings are oval in cross section, and the high-voltage winding is rectangular in cross-section.

And in the present invention, the turns ratio of said high voltage winding to said first low voltage winding corresponds to the turns ratio of said high voltage winding to said second low voltage winding.

In one embodiment of the present invention, the high voltage winding is in the case of the aforementioned three-phase transformation unit connected in a triangle.

In one embodiment of the present invention, said iron cores are fastened parallel to one another by a first and second fastening element arranged parallel to one another.

And, said iron core is integrally formed, and said iron core comprises: an upper iron core body and a lower iron core body, and three pairs of iron core rods, which are mutually mechanically connected in parallel with the upper iron core body and the lower iron core body, and said first low-voltage winding said second low-voltage winding and said high-voltage winding are each wound around the iron core bars of each pair.

In order to achieve the above object, there is provided a network in a second aspect of the embodiment of the present invention, the network comprising: a main network; a local area network, the said main network being powered by a main step-up transformer; at least one wind generator unit, from which said local area network is powered by said three-phase transformer system; and a control device from which the voltage of said DC power supply is regulated according to the input side or output side power factor of the local area network.

In the network according to the embodiment of the present invention, a corresponding induction current is generated by the control of the voltage of the DC power supply of the three-phase transformer system in the network and introduced into the network to dynamically regulate the power factor of the power line, wherein the active power of the generator, of the transformer and the electrical appliance is improved, the grid voltage in the transmission and the transformation is stabilized and the quality of the electrical energy is improved. At the same time it is no longer necessary to install an additional adjustable reactor, etc., so that the investment costs are considerably reduced.

In addition, according to the exemplary embodiment of the present invention, the network additionally comprises a capacity compensation unit, by means of which the output of at least one of the wind generator units is reactively compensated.

In a third aspect of the embodiment of the present invention, there is provided a local area network comprising said three-phase transformer system.

The additional aspects and advantages of the present invention will be set forth in part in the following description, and in part will become apparent from the following description, or may be learned by practice of the present invention.

Brief description of the drawings

In conjunction with the following drawings, the above and / or additional aspects and advantages of the present invention will be explained in detail with reference to the embodiments in order to facilitate the understanding of the present invention, wherein

1 Three-phase transformer system according to an embodiment of the present invention shown schematically in the schematic diagram;

2 Three-phase transformation unit according to an embodiment of the present invention shown in plan view;

3 Three-phase transformation unit according to an embodiment of the present invention shown in section;

4 Power network of the network according to an embodiment of the present invention shown schematically, and

5 Power network of the network according to a specific typical example of the present invention shown schematically.

embodiment

Hereinafter, the embodiments of the present invention will be explained in detail, which are illustrated in the accompanying drawings, wherein the same or similar components or components with the same or similar function from beginning to end with the same or similar reference numerals. The embodiments shown below in conjunction with the drawings are typical examples, they are only for the interpretation of the present invention, and should not be considered as limiting the present invention.

The terminologies used in the presentation of the present invention, such as "longitudinal,""transverse,""upper,""lower,""forward,""rear,""left,""right,""vertical,""horizontal,""Top","bottom", etc. refer to the azimuth or gaze angle shown in the drawings or the positional relationship, which serve only to facilitate the explanation of the present invention. Such terminologies do not mean that the present invention should have particular azimuth design and operation. Therefore, they are not considered the limitation of the present invention.

In the following, only a typical example will be described which should not in any way be construed as limiting the present invention and as limiting the application or use of the present invention. To simplify, the similar components shown in the drawings are designated by like numerals. For example, "at least one" should be understood by the terminology "at least one of A, B and C" as a logic (A or B or C ", that is, as a non-exclusive logic" or ".) It should be understood that it is possible to carry out the process steps in different order without changing the principle of the present invention.

For example, the terminology "module or unit" refers to an application specific integrated circuit (ASIC), circuit, processor (shared, specific, or group), and memory for executing software or more than one software or software Hardware program, a composite logic circuit, and / or other corresponding components with said function.

Hereinafter, a three-phase transformer system according to the embodiment of the invention and a network with such three-phase transformer system will be explained in conjunction with the drawings.

In 1 When a three-phase transformer system is shown in a first aspect of the embodiment of the present invention, the three-phase transformer system includes a three-phase transformer unit 101 with three single phase transformer components or single phase transformer components 1 and a DC power supply 102 wherein each single-phase transforming component 1 an iron core 10 , a first low-voltage winding 11 , a second low-voltage winding 12 and a high voltage winding 13 includes, and the iron core 10 each transformation component 1 a pair of iron core bars 100 and 200 includes, the first low-voltage winding 11 and the second low-voltage winding 12 parallel to each other on the iron core 10 are arranged, for example, the first low-voltage winding 11 on the iron core bar 100 is arranged, and the second low-voltage winding 12 on the iron core bar 200 is arranged. These are the first low-voltage winding 11 and the second low-voltage winding 12 the three-phase transformation unit 101 separately star connected. The high voltage winding 13 is at the first low voltage winding 11 and the second low-voltage winding 12 attached. The positive pole (+) and the negative pole (-) of the DC power supply 102 are each at the neutral point O1 of the first low-voltage winding 11 and with the neutral point O2 of the second low-voltage winding 12 electrically connected, and the voltage of the DC power supply 102 is adjustable. By regulating the voltage of the DC power supply 102 is the magnetic saturation factor of the iron core 10 changeable, so that the reactance of the three-phase transformation unit 101 is changed.

In the in 1 illustrated embodiment of the present invention corresponds to the Windungszahlverhältnis of the high voltage winding 13 to the first low-voltage winding 11 the turns ratio of the high voltage winding 13 to the second low voltage winding 12 in the three-phase transformation unit 101 , And in one embodiment of the present invention, the high voltage winding is 13 the three-phase transformation unit 101 switched triangular. Of course, one can understand that the high voltage winding 13 the three-phase transformation unit 101 can also be starred. These are the first low-voltage winding 11 and the second low-voltage winding 12 formed in cross-section oval-shaped, and is the high-voltage winding 13 formed in cross-section rectangular.

That is, the function of the three-phase transformation unit 101 according to the embodiment of the present invention is the same as the function of the general transformer, wherein the energy is transmitted by the step-up transformation or by the low-transformation, when the voltage of the DC power supply 102 is zero. As in 1 shown when the inserted voltage of the DC power supply 102 reaches a certain value, the direction of the magnetic flux of the alternating current corresponds to the direction of the magnetic flux of the direct current in an iron core rod 100 from the two iron core rods 100 . 200 in any period of the sine wave, and are the direction of the magnetic flux of the alternating current and the direction of the magnetic flux of the direct current in the other iron core rod 200 opposite each other. Therefore, an iron core bar 100 the two iron core rods 100 . 200 according to the two low-voltage windings 11 . 12 always in a near-saturation state, and is the other iron core bar 200 in a sub-saturation state. In this case, the Reactance of the three-phase transformation unit 101 adjustable, so that the induction current can be introduced into the network. The direction of the magnetic flux of the alternating current is denoted by the dotted arrow, and the direction of the magnetic flux of the direct current is indicated by the solid arrow.

At the in 1 illustrated embodiment of the present invention is the high voltage winding 13 each electrically connected to the high voltage terminals A, B, C, are the first low-voltage winding 11 and the second low-voltage winding 12 for each single-phase transforming component 1 each electrically connected to the low-voltage terminals a, b, c.

At the in 2 Illustrated embodiment of the present invention are the iron core 10 from a mutually parallel first and second fastening element 21 . 22 attached parallel to each other. From the first fastener 21 and the second fastening element 22 Six iron core bars can be completely fixed.

And as in 1 and 3 represented is the iron core 10 the three-phase transforming unit 101 integrally formed. The iron core 10 still includes an upper iron core body 31 , a lower iron core body 32 and three pairs of iron core bars 100 . 200 , The three pairs of iron bars 100 . 200 are mutually parallel with the upper iron core body 31 and the lower iron core body 32 mechanically connected. The first low-voltage winding 11 and the second low-voltage winding 12 are each around the iron core rod 100 and the iron core bar 200 wound up with each pair, the high voltage winding 13 is around the iron core 10 wound up, etc. on the outer periphery of the first low-voltage winding 11 and the second low-voltage winding 12 attached.

In the three-phase transformer system according to the embodiment of the present invention, the magnetic saturation factor of the magnetic core becomes 10 the three-phase transformation unit 101 by regulating the voltage of the DC power supply 102 changed, so that the reactance of the three-phase transformation unit 101 is changed, and the regulation of the reactance of this transformer is achieved. Therefore, the application of this three-phase transformer acts like the application of the combination of a traditional three-phase transformer with a reactor, so that the industrial use costs are reduced.

In the following, the network will be associated with the above-mentioned three-phase transformer system 4 and 5 explained. As in 4 As shown, the network comprises a main network 41 , a local area network 42 , at least one wind generator unit 43 , a control device 44 , a main step-up transformer 45 and a three-phase transformer system 46 ,

The tension of the local network 42 gets through the main step-up transformer 45 to the tension of the main network 41 transformed, the local area network 41 flows simultaneously into the main network 41 one to the main network 41 to supply electricity. In a typical example of the present invention, the voltage of the local area network 42 35 KV, the voltage of the main network can be 220 KV, and in the wind generator area can the local network 42 from thirty-three wind generator units 43 and transformers exist.

As in 4 represented, becomes the local area network 42 at the same time from each wind generator unit 43 through the three-phase transformation system 46 powered. After the input-side or output-side network power factor of the local area network 42 is the voltage of the DC power supply 102 from the control device 44 controlled. For example, if the input side or output side power factor of the local area network 42 as real-time or real-time monitoring result of the control device 44 is less than 0.85, the DC power supply 102 immediately under the control of the control device 44 is turned on, and the induction current through the regulation of the voltage of the DC power supply 102 introduced into the network to perform appropriate compensation.

Specifically, as in 5 In addition, the network mentioned above additionally comprises a capacity compensation unit 51 , This includes the control device 44 a main control device 52 and one of the capacity compensation unit 51 corresponding sub-control device 53 , Each capacity compensation unit 51 is designed such that the output of at least one wind generator unit 43 is reactive compensated. In a typical example of the present invention, thirty-three capacitance compensation units 51 assembled to form an automatically switchable capacitor group. That is, the output voltage of the thirty-three wind generator units 43 for example, of 690 V is reactive compensated by the automatically switchable capacitor group, the harmonic or harmonic is eliminated, and the compensation is performed periodically.

In this case, the wind generator unit correspond 43 , the subcontrol device 53 , the capacity compensation unit 51 and the three-phase transformer system 46 each other or are coordinated. That is, the output side Voltage change and the power factor of the local area network 42 from the main controller 52 be monitored real-time or in Echteit, and the thirty-three sub-control devices 53 at the same time from the main control unit 52 be controlled to the power factor of the output of the local area network 42 to the thirty-three three-phase transformer systems 46 to monitor. The thirty-three sub-control devices 53 be from the main control unit 52 according to the input and output power factor of the local area network 42 controlled as monitoring result, the voltage of the DC power supply 102 in the thirty-three three-phase transformer systems 46 to regulate accordingly, and the capacity compensation units 51 be simultaneously through the sub-control devices 53 controlled accordingly, the output of the corresponding wind generator units 43 to dynamically compensate locally in a dynamic manner.

That is, the corresponding capacitance current or induction current from the main control device 52 after the change of the power factor of the network and the change of the mains voltage for compensation real time or in real time is used. Specifically, when the wind generator of the wind generator unit 43 running with high load, becomes the capacity compensation unit 51 automatically put into operation, namely, the capacitor group is automatically turned on to perform the reactive compensation in a dynamic manner. In this case, the induction current may have a value of zero. When the load of the wind generator of the wind generator unit 43 is small, becomes the capacity compensation unit 51 turned off, and it becomes the voltage of the DC power supply 102 set to a setpoint, the network of the three-phase transformer system 46 is supplied with appropriate induction current to stabilize the voltage of the network; if the compensation at the same time of the three-phase transformer system 46 and from the capacity compensation unit 51 is performed, namely, when the load is in the middle, the voltage of the DC power supply 102 to control the dynamic change of the induction current from zero to the set point, so that the harmonic of the network is rehabilitated, and the quality of the power supply of the network is improved. For example, in the field of metallogy, the voltage of the DC power supply 102 normally regulated, so that the network of the three-phase transformer system 46 supplied with induction current.

In another embodiment of the present invention, it is still possible to use the three-phase transformer system 46 in a phase shift mode, and when the three-phase transformer system configured in the phase shift mode 46 is integrated into the network since thirty-three three-phase transformer systems 46 are provided, it is possible to use different phase shift modes in each three-phase transformer system, namely, the phase angle of the phase shift is different, so that the harmonic of the local network is greatly reduced after the superposition, and the rehabilitation of the harmonics is avoided in the networking, and the Quality of electrical energy is improved.

In the network according to the embodiment of the present invention, the induction current is controlled by controlling the voltage of the DC power supply 102 of the three-phase transformer system 46 wherein the induction current is introduced into the network, so that the dynamic regulation of the power factor of the power line is achieved, the active power of the generator, the transformer and the electrical appliances is increased, the grid voltage is stabilized in the transmission and transformation, and the quality of electrical energy is improved. At the same time, it is no longer necessary to additionally install an adjustable reactor, etc., so that the investment costs are considerably reduced.

In a third aspect of the embodiment of the present invention, there is provided a local area network comprising the above-mentioned three-phase transformer system. It is understood that the induction current by controlling the voltage of the DC power supply of the three-phase transformer system 46 can be generated, wherein the induction current is introduced into the network, so that the dynamic regulation of the power factor of the network is achieved, the harmonics is eliminated, and the quality of the network is improved, only if the network normally comprises the above-mentioned three-phase transformer system.

In the description of the present description, the terminology "an embodiment", "some embodiments", "typical example", "concrete typical example" or "some typical examples" etc. refer to the specific features, the design, the fabric or the Advantages included in at least one embodiment or in a typical example. In the present specification, the schematic representation of the above-mentioned terminology does not necessarily refer to the same embodiments or the same typical examples. In addition, the illustrated features, the illustrated design, the illustrated fabric, or the illustrated advantages may be appropriately combined in any embodiment or in a plurality of embodiments or typical examples.

Although the embodiments of the present invention have been illustrated and described, it will be understood by those of ordinary skill in the art that the alteration, alteration, substitution and modification of the present invention also fall within the scope of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims (10)

A three-phase transformer system comprising: a three-phase transforming unit ( 101 ), wherein each single-phase transformation component ( 1 ) comprises: - an iron core ( 10 ); A first and a second low-voltage winding ( 11 . 12 ) parallel to each other on the iron core ( 10 ), said first low-voltage winding ( 11 ) and said second low-voltage windings ( 12 ) in the three-phase transformation unit ( 101 ) are star-connected separately; A high voltage winding ( 13 ) connected to the first and the second low-voltage winding ( 11 . 12 ) is attached; and - a DC power supply ( 102 ), in which the positive pole (+) and the negative pole (-) are respectively connected to the neutral point (O1) of the star-connected first low-voltage winding ( 11 ) and with the neutral point (O2) of the star-connected second low-voltage winding ( 12 ) are electrically connected or electrically connected. A three-phase transformer system according to claim 1, characterized in that said first low-voltage winding ( 11 ) and said second low-voltage winding ( 12 ) are formed oval in cross-section, and said high-voltage winding ( 13 ) is rectangular in cross-section. Three-phase transformer system according to claim 1 or 2, characterized in that the voltage of said DC power supply ( 102 ) is controllable. Three-phase transformer system according to one of the preceding claims, characterized in that the turns ratio of said high-voltage winding ( 13 ) to said first low-voltage winding ( 11 ) the turns ratio of said high voltage winding ( 13 ) to said second low-voltage winding ( 12 ) corresponds. Three-phase transformer system according to one of the preceding claims, characterized in that the high-voltage winding ( 13 ) in said three-phase transformation unit ( 101 ) is connected in a triangular shape. Three-phase transformer system according to one of the preceding claims, characterized in that the said iron cores ( 10 ) by a mutually parallel first and second fastening element ( 21 . 22 ) are mounted parallel to each other. Three-phase transformer system according to one of the preceding claims 1, characterized in that said iron core ( 10 ) is integrally formed, and said iron core ( 10 ) comprises: an upper iron core body ( 31 ) and a lower iron core body ( 32 ), and - three pairs of iron core rods ( 100 . 200 ), each parallel to the upper iron core body ( 31 ) and the lower iron core body ( 32 ) are mechanically connected, in which said first low-voltage winding ( 11 ), said second low-voltage winding ( 12 ) and said high voltage winding ( 13 ) around the iron core rods ( 100 . 200 ) of each pair are wound up. A network comprising: - a main network ( 41 ); - a local area network ( 42 ) from which the said main network ( 41 ) by a main step-up transformer ( 45 ) is powered; At least one wind generator unit ( 43 ) from which the said local area network ( 42 ) is powered by the three-phase transformer system according to any one of claims 1 to 7; and - a control device ( 44 ) from which the voltage of said DC power supply ( 102 ) according to the input-side or output-side power factor of said local area network ( 42 ) is controlled. Network according to claim 8, characterized in that the network additionally comprises: - a capacity compensation unit ( 51 ) from which the output of at least one of the wind generator units ( 43 ) is reactively compensated. Local area network ( 44 ) comprising the three-phase transformer system according to any one of claims 1-7.

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