SE1100309A1 - Transformer arrangement for high voltage applications - Google Patents
Transformer arrangement for high voltage applications Download PDFInfo
- Publication number
- SE1100309A1 SE1100309A1 SE1100309A SE1100309A SE1100309A1 SE 1100309 A1 SE1100309 A1 SE 1100309A1 SE 1100309 A SE1100309 A SE 1100309A SE 1100309 A SE1100309 A SE 1100309A SE 1100309 A1 SE1100309 A1 SE 1100309A1
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- Sweden
- Prior art keywords
- transformer arrangement
- electrical signal
- frequency
- high voltage
- transformer
- Prior art date
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- 238000004804 winding Methods 0.000 claims abstract description 42
- 230000006978 adaptation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Föreliggande uppfinning avser en transformator (9) för högspänningstillämpningar. Transformatorn (9) har medel (13) för omvandling av en elektrisk signal mottagen från ett högspänningsnät, varvid energiutbytet mellan transformatorns lindningar (11-1, 11-2) sker vid en hög frekvens i förhållande till högspänningsnätfrekvensen. Transformatorn (9) har vidare medel som omvandlar den högfrekventa signalen på sekundärsidan för anpassning till högspänningsnätet.(Fig. 2)The present invention relates to a transformer (9) for high voltage applications. The transformer (9) has means (13) for converting an electrical signal received from a high-voltage network, whereby the energy exchange between the transformer's windings (11-1, 11-2) takes place at a high frequency in relation to the high-voltage network frequency. The transformer (9) also has means that convert the high-frequency signal on the secondary side for adaptation to the high-voltage network. (Fig. 2)
Description
15 20 25 30 In particular, one object is to provide a transformer arrangement with reduced energy losses. 15 20 25 30 In particular, one object is to provide a transformer arrangement with reduced energy losses.
The above object may be obtained by means of the invention as defined in the independent claims. Specific embodiments are set out in the dependent claims.The above object may be obtained by means of the invention as defined in the independent claims. Specific embodiments are set out in the dependent claims.
In a first aspect of the present disclosure there is provided A DC-DC transformer arrangement for a power system, which DC- DC transformer arrangement comprises: an inverter for converting a DC electrical signal received from the power system to a first AC electrical signal; a primary winding arranged to receive the first AC electrical signal; a secondary winding arranged so in relation to the primary winding that a magnetic field generated in the primary winding by means of the first AC electrical signal induces a second AC electrical signal in the secondary winding, and a rectifier for converting the second AC electrical signal to a second DC electrical signal, wherein the inverter and the rectifier each have high voltage electron tubes as switch means.In a first aspect of the present disclosure there is provided A DC-DC transformer arrangement for a power system, which DC- DC transformer arrangement comprises: an inverter for converting a DC electrical signal received from the power system to a first AC electrical signal; a primary winding arranged to receive the first AC electrical signal; a secondary winding arranged so in relation to the primary winding that a magnetic field generated in the primary winding by means of the first AC electrical signal induces a second AC electrical signal in the secondary winding, and a rectifier for converting the second AC electrical signal to a second DC electrical signal, where the inverter and the rectifier each have high voltage electron tubes as switch means.
By providing a high voltage transformer which utilizes high frequency electrical signals for inducing magnetic fields in its windings, losses in the transformer arrangement may be reduced. The high voltage electron tubes provide fast response times for switching, low costs and a small footprint. Thus, the present transformer arrangement is space-saving compared to the prior art.By providing a high voltage transformer which utilizes high frequency electrical signals for inducing magnetic fields in its windings, losses in the transformer arrangement may be reduced. The high voltage electron tubes provide fast response times for switching, low costs and a small footprint. Thus, the present transformer arrangement is space-saving compared to the prior art.
Each high voltage electron tube may be a cold cathode electron tube. Cold cathode electron tubes may be able to resist high voltages and currents while provide reliable switching.Each high voltage electron tube may be a cold cathode electron tube. Cold cathode electron tubes may be able to resist high voltages and currents while providing reliable switching.
One embodiment may comprise control means for controlling the inverter and the rectifier. 10 15 20 25 Each of the electrical signals may be current.One embodiment may comprise control means for controlling the inverter and the rectifier. 10 15 20 25 Each of the electrical signals may be current.
Alternatively each of the electrical signals may be voltage.Alternatively each of the electrical signals may be voltage.
One embodiment may comprise a rectifier, an inverter and primary and secondary windings for each electrical phase.One embodiment may comprise a rectifier, an inverter and primary and secondary windings for each electrical phase.
In a second aspect of the present disclosure there is provided an AC-AC transformer arrangement for a power system, which AC- AC transformer arrangement comprises: a first frequency converter for frequency converting a first electrical signal received from the power system to a higher frequency; a primary winding arranged to receive the converted first electrical signal; a secondary winding arranged so in relation to the primary winding that a magnetic field generated in the primary winding by means of the converted first electrical signal induces a second electrical signal in the secondary winding, and a second frequency converter for frequency converting the second electrical signal to a lower frequency, wherein the first and the second frequency converters each have high voltage electron tubes as switch means.In a second aspect of the present disclosure there is provided an AC-AC transformer arrangement for a power system, which AC- AC transformer arrangement comprises: a first frequency converter for frequency converting a first electrical signal received from the power system to a higher frequency ; a primary winding arranged to receive the converted first electrical signal; a secondary winding arranged so in relation to the primary winding that a magnetic field generated in the primary winding by means of the converted first electrical signal induces a second electrical signal in the secondary winding, and a second frequency converter for frequency converting the second electrical signal to a lower frequency, where the first and the second frequency converters each have high voltage electron tubes as switch means.
Each high voltage electron tube may be a cold cathode electron tube.Each high voltage electron tube may be a cold cathode electron tube.
One embodiment may comprise control means for controlling the first frequency converter and the second frequency converter.One embodiment may comprise control means for controlling the first frequency converter and the second frequency converter.
Each of the electrical signals may be current.Each of the electrical signals may be current.
Alternatively each of the electrical signals may be voltage.Alternatively each of the electrical signals may be voltage.
One embodiment may comprise a first frequency converter, a second frequency converter, and primary and secondary windings for each electrical phase. 10 15 20 25 Additional features and advantages will be disclosed in the following.One embodiment may comprise a first frequency converter, a second frequency converter, and primary and secondary windings for each electrical phase. 10 15 20 25 Additional features and advantages will be disclosed in the following.
BRIEF DESCRIPTION OF THE DRAWINGS The invention and the advantages thereof will now be described by way of non-limiting examples, with reference to the accompanying drawings of which: Fig. 1 is a schematic block diagram of a high voltage power system.BRIEF DESCRIPTION OF THE DRAWINGS The invention and its advantages will now be described by way of non-limiting examples, with reference to the accompanying drawings of which: Fig. 1 is a schematic block diagram of a high voltage power system.
Fig. 2 is a circuit diagram of an example of a transformer arrangement for use in the high voltage power system in Fig. 1.Fig. 2 is a circuit diagram of an example of a transformer arrangement for use in the high voltage power system in Fig. 1.
DETAILED DESCRIPTION Fig. 1 shows a power system 1 such as an electric grid. The power system 1 comprises a power plant 3, such as a wind farm or a hydroelectric plant and a power line 11, which together form a power transmission network part of the power system 1.DETAILED DESCRIPTION Fig. 1 shows a power system 1 such as an electric grid. The power system 1 comprises a power plant 3, such as a wind farm or a hydroelectric plant and a power line 11, which together form a power transmission network part of the power system 1.
The power system 1 further comprises a substation 5 to which a plurality of loads 7 are connected. The substation and its lines to the loads 7 form a distribution network part of the power system 1.The power system 1 further comprises a substation 5 to which a plurality of loads 7 are connected. The substation and its lines to the loads 7 form a distribution network part of the power system 1.
Power transformer arrangements 9, in the following referred to as transformer arrangements, connect the different parts of the power system 1. Such transformers may for instance provide AC to AC transformation or DC to DC transformation of an electrical signal in the grid. The electrical signal may e.g. be a voltage signal or a current signal.Power transformer arrangements 9, in the following referred to as transformer arrangements, connect the different parts of the power system 1. Such transformers may for instance provide AC to AC transformation or DC to DC transformation of an electrical signal in the grid. The electrical signal may e.g. be a voltage signal or a current signal.
With reference to Fig. 2, an example of a transformer arrangement 9 will be described. For reasons of clarity, only the primary side of the transformer arrangement 9 is shown. l0 15 20 25 30 The secondary side of the transformer arrangement 9 has a similar structure, as will be made clear herebelow.With reference to Fig. 2, an example of a transformer arrangement 9 will be described. For reasons of clarity, only the primary side of the transformer arrangement 9 is shown. l0 15 20 25 30 The secondary side of the transformer arrangement 9 has a similar structure, as will be made clear herebelow.
The transformer arrangement 9 comprises a primary winding 11- 1, a secondary winding 11-2, an inverter 13 connected to the primary winding 11-1 and a rectifier (not shown) connected to the secondary winding 11-2. The transformer arrangement 9 is for arrangement in a power system such as power system 1.The transformer arrangement 9 comprises a primary winding 11- 1, a secondary winding 11-2, an inverter 13 connected to the primary winding 11-1 and a rectifier (not shown) connected to the secondary winding 11-2. The transformer arrangement 9 is for arrangement in a power system such as power system 1.
Thereby the transformer arrangement 9 may be fed with an electrical signal which it transforms and provides to another part of the power system via the rectifier.Thereby the transformer arrangement 9 may be fed with an electrical signal which it transforms and provides to another part of the power system via the rectifier.
Each of the inverter 13 and rectifier comprises switch means 13 in the form of high voltage electron tubes. Each high voltage electron tube 15 is controlled by means of a control means 17. For reasons of simplicity only one of the high voltage electron tubes 15 of the inverter 13 is shown to be connected to the control means 17. In reality each high voltage electron tube is controlled by means of a control means, as would be apparent to the skilled person. One such control means may in one variation control all high voltage electron tubes. Alternatively, each of the inverter 13 and rectifier is controlled by a separate control means. In another variation, each high voltage electron tube is associated with an individual control means.Each of the inverter 13 and rectifier comprises switch means 13 in the form of high voltage electron tubes. Each high voltage electron tube 15 is controlled by means of a control means 17. For reasons of simplicity only one of the high voltage electron tubes 15 of the inverter 13 is shown to be connected to the control means 17. In reality each high voltage electron tube is controlled by means of a control means, as would be apparent to the skilled person. One such control means may in one variation control all high voltage electron tubes. Alternatively, each of the inverter 13 and rectifier is controlled by a separate control means. In another variation, each high voltage electron tube is associated with an individual control means.
The control means 17 provide switching signals to the high voltage electron tubes 15. The switching signal may in one embodiment be based on pulse width modulation. Other signal modulations may also be possible, as would be apparent to the skilled person.The control means 17 provide switching signals to the high voltage electron tubes 15. The switching signal may in one embodiment be based on pulse width modulation. Other signal modulations may also be possible, as would be apparent to the skilled person.
High voltage electron tubes which may be suitable for the present disclosure are for instance cold cathode electron tubes such as the electron tube presented in US 4,950,962. In 10 15 20 25 general, any electron tube which may withstand currents in a high voltage power system, and which may be switched in such a system, may be utilized.High voltage electron tubes which may be suitable for the present disclosure are for instance cold cathode electron tubes such as the electron tube presented in US 4,950,962. In 10 15 20 25 general, any electron tube which may withstand currents in a high voltage power system, and which may be switched in such a system, may be utilized.
The transformer arrangement 9 may in one variation be of air core type, i.e. the windings of the transformer arrangement are not wound around any structure.The transformer arrangement 9 may in one variation be of air core type, i.e. the windings of the transformer arrangement are not wound around any structure.
Alternatively, the primary and secondary windings are wound around a core substrate. In one embodiment the core substrate is a non-magnetic material. Such a non-magnetic material may for instance be bakelite or any other non-conductive heat resistant plastic or similar material.Alternatively, the primary and secondary windings are wound around a core substrate. In one embodiment the core substrate is a non-magnetic material. Such a non-magnetic material may for instance be bakelite or any other non-conductive heat resistant plastic or similar material.
The frequency of the alternating electric signal generated by the inverter 13 and provided to the primary windings 11-1 may be in the kilohertz range. Alternatively, the frequency of the alternating electric signal generated by the inverter 13 and provided to the primary windings 11-1 may be in the megahertz range. Thus, the high voltage electron tubes 15 may be switched such that the inverter provides a very high frequency alternating electrical signal to the primary windings 11-1 compared to signal frequencies in power systems in general.The frequency of the alternating electric signal generated by the inverter 13 and provided to the primary windings 11-1 may be in the kilohertz range. Alternatively, the frequency of the alternating electric signal generated by the inverter 13 and provided to the primary windings 11-1 may be in the megahertz range. Thus, the high voltage electron tubes 15 may be switched such that the inverter provides a very high frequency alternating electrical signal to the primary windings 11-1 compared to signal frequencies in power systems in general.
The primary and secondary windings 11-1 and 11-2 may for instance be formed by means of coaxial cable or any similar high frequency low loss conductive means.The primary and secondary windings 11-1 and 11-2 may for instance be formed by means of coaxial cable or any similar high frequency low loss conductive means.
The rectifier is arranged to convert the alternating electrical signal induced in the secondary windings 11-2 and provided to the rectifier by the secondary windings ll-2 to a DC electrical signal. The DC electrical signal may be provided back to the power system. 10 15 20 25 30 In an alternative embodiment not shown in the drawings, the transformer arrangement is an AC-AC transformer arrangement.The rectifier is arranged to convert the alternating electrical signal induced in the secondary windings 11-2 and provided to the rectifier by the secondary windings ll-2 to a DC electrical signal. The DC electrical signal may be provided back to the power system. 10 15 20 25 30 In an alternative embodiment not shown in the drawings, the transformer arrangement is an AC-AC transformer arrangement.
The AC-AC transformer arrangement comprises a first frequency converter on the primary side of the transformer arrangement and a second frequency converter on the secondary side of the transformer arrangement. Furthermore, the transformer arrangement also comprises primary and secondary windings and at least one control means for switching the first and second frequency converter.The AC-AC transformer arrangement comprises a first frequency converter on the primary side of the transformer arrangement and a second frequency converter on the secondary side of the transformer arrangement. Furthermore, the transformer arrangement also comprises primary and secondary windings and at least one control means for switching the first and second frequency converter.
The first frequency converter may comprise a rectifier in series with an inverter. The rectifier is arranged to generate a DC electrical signal which the inverter converts to a high frequency electrical signal and which is provided to the primary windings. Thus, in use the first frequency converter increases the frequency of an AC electrical signal provided to the transformer arrangement from an electrical source.The first frequency converter may comprise a rectifier in series with an inverter. The rectifier is arranged to generate a DC electrical signal which the inverter converts to a high frequency electrical signal and which is provided to the primary windings. Thus, in use the first frequency converter increases the frequency of an AC electrical signal provided to the transformer arrangement from an electrical source.
The second frequency converter may comprise a rectifier in series connection with an inverter. The rectifier may receive the high frequency electrical signal from the secondary windings and convert it to a DC electrical signal. The inverter is arranged to convert the DC electrical signal to e.g. a 50 Hz or 60 Hz electrical signal for providing it back to the power system.The second frequency converter may comprise a rectifier in series connection with an inverter. The rectifier may receive the high frequency electrical signal from the secondary windings and convert it to a DC electrical signal. The inverter is arranged to convert the DC electrical signal to e.g. a 50 Hz or 60 Hz electrical signal for providing it back to the power system.
The switch means in both the first and the second frequency converters are high voltage electron tubes, as described in the DC-DC transformer arrangement hereabove.The switch means in both the first and the second frequency converters are high voltage electron tubes, as described in the DC-DC transformer arrangement hereabove.
The frequency of the frequency converted electrical signal may for instance be in the kilohertz range. Alternatively, the frequency of the frequency converted electrical signal may be in the megahertz range. Thus, the high voltage electron tubes may be switched such that the inverter provides a high 10 frequency alternating electrical signal to the primary windings.The frequency of the frequency converted electrical signal may for instance be in the kilohertz range. Alternatively, the frequency of the frequency converted electrical signal may be in the megahertz range. Thus, the high voltage electron tubes may be switched such that the inverter provides a high 10 frequency alternating electrical signal to the primary windings.
Transformer arrangements according to the present disclosure may for instance be utilized in HVDC or FACTS applications in high voltage power systems. Beneficially, the transformer arrangement provides a low-loss high voltage transformer which requires small space.Transformer arrangements according to the present disclosure may for instance be utilized in HVDC or FACTS applications in high voltage power systems. Beneficially, the transformer arrangement provides a low-loss high voltage transformer which requires small space.
The skilled person in the art realizes that the present invention by no means is limited to the examples described hereabove. On the contrary, many modifications and Variations are possible within the scope of the appended claims.The skilled person in the art realizes that the present invention by no means is limited to the examples described hereabove. On the contrary, many modifications and variations are possible within the scope of the appended claims.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1100309A SE1100309A1 (en) | 2011-04-21 | 2011-04-21 | Transformer arrangement for high voltage applications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1100309A SE1100309A1 (en) | 2011-04-21 | 2011-04-21 | Transformer arrangement for high voltage applications |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE1100309A1 true SE1100309A1 (en) | 2011-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1100309A SE1100309A1 (en) | 2011-04-21 | 2011-04-21 | Transformer arrangement for high voltage applications |
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| Country | Link |
|---|---|
| SE (1) | SE1100309A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103959624A (en) * | 2011-08-01 | 2014-07-30 | 阿尔斯通技术有限公司 | DC to DC converter assembly |
-
2011
- 2011-04-21 SE SE1100309A patent/SE1100309A1/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103959624A (en) * | 2011-08-01 | 2014-07-30 | 阿尔斯通技术有限公司 | DC to DC converter assembly |
| CN103959624B (en) * | 2011-08-01 | 2016-10-19 | 阿尔斯通技术有限公司 | DC-to-DC converter assembly |
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