CN201369679Y - Electronic transformer for electric power line - Google Patents
Electronic transformer for electric power line Download PDFInfo
- Publication number
- CN201369679Y CN201369679Y CNU2009200361428U CN200920036142U CN201369679Y CN 201369679 Y CN201369679 Y CN 201369679Y CN U2009200361428 U CNU2009200361428 U CN U2009200361428U CN 200920036142 U CN200920036142 U CN 200920036142U CN 201369679 Y CN201369679 Y CN 201369679Y
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Abstract
An electronic transformer for an electric power line is divided into three stages: an input stage, an isolation stage and an output stage, wherein the input stage adopts an H-bridge cascaded topological structure so as to adapt for the requirement of the input for different voltage stages, the isolation stage adopts a parallel format of a plurality of high-frequency transformers, DC/AC high-frequency modulation and AC/DC high-frequency modulation in the isolation link adopt a single-phase full-control half-bridge structure so as to save switch devices; the output stage consists of one or more three-phase voltage source convertors which are connected in parallel and can realize multi-passage output according to the requirement of the load; and the output stage convertor is also connected with an LC filter so as to improve the waveform quality of the voltage current. The whole device completely adopts mature power devices; and each layer cascaded by the input stage and the corresponding isolation stage can be combined as a convertor, thus facilitating the design and production for the convertor. The device can complete the simple functions of the traditional transformer such as voltage transformation, isolation and energy transmission, and can realize novel functions which can adapt for the requirement of power system.
Description
Technical field
The utility model relates to a kind of power transmission and distribution device that can realize multiple function, belongs to the technical field that power electronics is used in electric power system.
Background technology
Power transformer has become the basic composition equipment of electrical power trans mission/distribution system since 19th century were invented.Manufacture craft is simple though traditional power transformer has, the reliability advantages of higher, but it only can realize electric pressure conversion and insulation isolation, function ratio is more single, and because there is electromagnetic coupled in the former secondary of transformer, can't realize the isolation of transformer both sides fault current, voltage, the fault restriction scope; Can't realize the isolation of transformer both sides distortion current, interference voltage, cause sensitive load to be affected on the one hand, cause electric network pollution on the other hand; Work as transformer in addition and also have magnetizing inrush current, paired running sharing of load inequality and problems such as circulation, insulating oil contaminated environment.
The notion of the electric power electric transformer seventies in last century (PET-Power electronic transformer) is suggested for this reason, and PET utilizes the power electronics commutation technique to realize voltage transformation and energy delivery.Its outstanding feature is by voltage source converter (VSC) amplitude and the phase place of its former secondary AC side voltage, electric current to be carried out the continuous controllable adjusting.Therefore, PET not only can overcome the defective of traditional transformer, can also solve the problems such as electromagnetic looped network, the quality of power supply, reactive-load dynamic compensation and the raising system stability limit that electric power system faces.
Therefore, along with power electronic device level and high frequency transformer Development of Materials, electric power electric transformer will replace traditional transformer and be widely used in electric power system.
Summary of the invention
Technical problem: the purpose of this utility model is to propose a kind of power circuit electronic transformer, not only realize voltage transformation, the voltage isolation of traditional transformer, the simple functions of energy delivery, can also realize that some other adapts to the new function of electric power system needs.
Technical scheme: the power circuit that the utility model proposes is identical and independent with the electronic transformer three-phase structure, every three grades of formation schemes, i.e. input stage, isolation level, output stage of adopting mutually.Input stage is formed by many groups of identical power inverter cascades, and the AC side of each power inverter connects a reactor, and DC side is connected with tapped dc energy storage electric capacity; Isolation level comprises high frequency DC/AC link, high frequency transformer, high-frequency AC/DC link; Output stage is made of many groups inverter power converter, the shared output stage dc energy storage of the DC side of each inverter power converter electric capacity, the AC side of each the inverter power converter LC filter of also connecting.
This power circuit is as follows with the connected mode of electronic transformer:
Three-phase structure in this device is identical and independent, every three grades of formations, i.e. input stage, isolation level, output stage of adopting mutually; Input stage is formed by a plurality of identical power inverter cascades, and the AC side of each power inverter connects a reactor, and DC side connects corresponding dc energy storage electric capacity; Isolation level comprises high frequency DC/AC link, high frequency transformer, high-frequency AC/DC link; Output stage is made of a plurality of inverter power converters, the shared output stage dc energy storage of its DC side electric capacity, the also corresponding LC filter that connects of each inverter power converter AC side; Wherein, the power inverter number of input stage cascade equates with the high frequency transformer number of isolation level; The DC side of the high frequency DC/AC link of the DC side of each power inverter of input stage and corresponding isolation level is connected respectively to corresponding dc energy storage electric capacity (3) two ends, and the high-pressure side non-same polarity of the dc energy storage electric capacity mid point and the high frequency transformer of correspondence is connected; The DC side output of the high-frequency AC of isolation level/DC link is connected to output stage dc energy storage electric capacity, and the non-same polarity of each high frequency transformer low-pressure side of isolation level is connected respectively to the mid point of output stage dc energy storage electric capacity; Through behind the above-mentioned line, high frequency DC/AC link, high frequency transformer and the high-frequency AC of the corresponding power converter of input stage, corresponding isolation level/DC link is formed a high pressure/isolated converter, and every phase of a multifunctional power electric transformer just is made up of a plurality of such high pressure/isolated converters; At last, output stage is composed in parallel by a plurality of identical inverter power converters, and each inverter power converter output terminal connects a corresponding LC filter as output.
Described input stage uses the power inverter cascade to form; The high frequency DC/AC link of isolation level and high-frequency AC/DC link all adopts the single-phase semi-bridge circuit; Output stage adopts the inverter power converter to compose in parallel multichannel output.
Described input stage adopts cascaded topology, need not to utilize transformer coupledly just can directly import high pressure, and the inverter power converter parallel-connection structure of output stage employing three-phase voltage source type is to satisfy the needs of low-voltage and high-current.
Described output stage is applicable to the three-phase three-wire system system when adopting three-phase three brachium pontis structures, then be applicable to three-phase four-wire system when adopting the three-phase four-arm structure; Can realize the output of three-phase voltage source type inverter power converter parallel multiplex, satisfy the needs of different loads requirement, particularly sensitive loads.
Beneficial effect: power circuit electronic transformer of the present utility model except the advantage that possesses the conventional electric power electronic transformer, with respect to the present domestic and international design that proposes, also has following function:
1. this power circuit can be realized the function that multichannel is exported with electronic transformer, when using as step-down transformer, can change the way of output by changing output stage power inverting converter in parallel number, thereby satisfy the demand of various different load characteristics.
This power circuit is identical and independent with electronic transformer three-phase inverter structure, can realize the self-balancing of three-phase; Can realize the accurate same-phase of the electric current and voltage of former secondary simultaneously by High Power Factor rectification, inversion, improve power factor.
2. this power circuit is connected in the distribution system with electronic transformer, on the one hand by regulating the amplitude and the phase place of its AC side voltage, electric current, solves power quality problems such as voltage dip/temporary liter, harmonic wave, fluctuation and flickering; On the other hand, by its AC-DC-AC link, and high frequency transformer isolates, can realize loading and electric power system between interference isolate, suppress harmonic wave, improve the electrical network electric circumstance.
3. when this power circuit is used electronic transformer with form connecting system interconnections such as serial or parallel connections, play the effect of SSSC and STATCOM, therefore can improve the stability limit of system, increase the delivering power of interconnection.
4. this power circuit can carry out the continuous controllable adjusting with the former secondary AC side voltage of electronic transformer, the amplitude and the phase place of electric current, therefore can adjust the equivalent electrical impedance of place circuit, improve the transient stability limit of the electromagnetic looped network section at power grid construction initial stage.
5. this power circuit carries out the continuous controllable adjusting with the amplitude and the phase place of the not only former secondary AC side of electronic transformer voltage, electric current, and alternating current-direct current has concurrently, so help voltage such as solar energy, wind-force and small power station or frequency fluctuation is big and distributed power source that alternating current-direct current has concurrently inserts electrical network.
6. this power circuit can instantaneous (us level) turn-off with the employed device for high-power power electronic of electronic transformer, so electric power electric transformer employing control method, can realize the fault current restriction.
7. this power circuit utilizes totally digitilized technology to realize on-line monitoring with electronic transformer, is convenient to digital transformer substation and implements, and can save old-fashioned protective relaying device by protection and the monitoring of self simultaneously.
Description of drawings
Fig. 1 represents the power circuit single-phase whole theory diagram of electronic transformer,
Fig. 2 represents the power circuit whole theory diagram of electronic transformer three-phase.
Have among the above figure: power inverter 1, reactor 2, dc energy storage electric capacity 3, high frequency DC/AC link 4, high frequency transformer 5, high-frequency AC/DC link 6, inverter power converter 7, output stage dc energy storage electric capacity 8, LC filter 9.
Embodiment
This power circuit is with the technical scheme of the high-pressure side cascade of electronics transformer adopting, low-pressure side parallel connection, and three-phase structure is independent and identical, the circuit topology of its a certain phase as shown in Figure 1, overall structure is divided into three grades: input stage, isolation level, output stage.Input stage is formed by the cascade of many groups power inverter, and the cascade number is determined (as: high side voltage 10kV during switching device 1200V/600A, needs 13 converter cascades) by electric pressure and selected power electronic device level.The power inverter of each cascade is the single-phase fully controlled bridge of being made up of four full-control type devices, and reactor of AC side series connection of each single-phase fully controlled bridge suppresses to realize the AC side harmonic wave.Certain capacity capacitor group in parallel between two end lines of the DC side of single-phase fully controlled bridge converter, the mid point of capacitor group is connected with the non-same polarity of isolation link medium-high frequency transformer.
This power circuit is divided into three parts with the isolation level of electronic transformer: high frequency DC/AC link, high frequency transformer, high frequency DC/AC link.High frequency DC/AC link is modulated into the high-frequency signal of 1-10kHz with the direct voltage of input, and high-frequency AC/DC link then is reduced to direct current with the high frequency ac signal of high frequency transformer output.High frequency transformer is mainly finished the effect of voltage transformation and isolation, and its volume and frequency are inversely proportional to, and loss and frequency are directly proportional, should be according to the frequency of high-frequency signal and the loss comprehensive Design of permission during design.By forming with the same number of single-phase semi-bridge code converter of input stage cascade, each converter is the single-phase semi-bridge for being made up of two full-controlled switch devices all near the high-pressure side part for isolation level, and the corresponding end line of its two terminated line and input stage links to each other; Isolation level also is the single-phase semi-bridge of being made up of two full-controlled switch devices near the converter of low-pressure side part, its number also single-phase full bridge type power inverter number with the high-pressure side cascade is identical, the DC side output of this single-phase semi-bridge converter connects output stage dc energy storage capacitor, and the secondary non-same polarity of the mid point of capacitor and high frequency transformer links to each other; Different be the shared DC side of all high-frequency AC/DC link with the DC side of high frequency DC/AC link is independent; High frequency transformer in the middle of the isolation level is the separate single-phase transformer, and its quantity also single-phase full bridge type power inverter number with the high-pressure side cascade is identical.The benefit of this structural design is that a power inverter and the corresponding isolation level of input stage can be formed a high pressure/isolated converter, is convenient to design, produces, safeguards.
This power circuit is made up of many groups inverter power converter with the output stage of electronic transformer, this inverter power converter can be three-phase three arm converters of being made up of six full-control type devices, also can be the three-phase four-arm converter of forming by eight full-control type devices, two end lines of the DC side of inverter power converter should be connected with the DC side terminal pair of isolating transformer near low-pressure side, and AC side is the series LC filter circuit also.
Described power circuit electronic transformer, input stage use the power inverter cascade of single-phase full bridge type to form; The high frequency DC/AC link of isolation level and high-frequency AC/DC link all adopts the single-phase semi-bridge circuit; Output stage adopts the inverter power converter of three-phase voltage source type to compose in parallel multichannel output, and the switching device of each road output can be selected different power electronic device for use, realizes the output of different needs.
Described power circuit electronic transformer, each converter AC side of the input stage reactor of all having connected.
Described power circuit electronic transformer, input stage adopt cascaded topology to satisfy the needs of the little electric current of high voltage, and output stage adopts three-phase voltage source type inverter power converter parallel-connection structure to satisfy the needs of low-voltage and high-current or multiple different qualities load.
Described power circuit electronic transformer, output stage are applicable to when adopting three-phase three brachium pontis structures and the three-phase three-wire system system are applicable to three-phase four-wire system when also adopting the three-phase four-arm structure.
Claims (4)
1. power circuit electronic transformer, it is characterized in that: the three-phase structure in this device is identical and independent, every three grades of formations, i.e. input stage, isolation level, output stage of adopting mutually; Input stage is formed by a plurality of identical power inverters (1) cascade, and the AC side of each power inverter connects a reactor (2), and DC side connects corresponding dc energy storage electric capacity (3); Isolation level comprises high frequency DC/AC link (4), high frequency transformer (5), high-frequency AC/DC link (6); Output stage is made of a plurality of inverter power converters (7), the shared output stage dc energy storage of its DC side electric capacity (8), the also corresponding LC filter (9) that connects of each inverter power converter AC side; Wherein, the power inverter of input stage cascade (1) number equates with high frequency transformer (5) number of isolation level; The DC side of the high frequency DC/AC link (4) of the DC side of each power inverter of input stage and corresponding isolation level is connected respectively to corresponding dc energy storage electric capacity (3) two ends, and the high-pressure side non-same polarity of dc energy storage electric capacity (3) mid point and the high frequency transformer of correspondence is connected; The DC side output of the high-frequency AC of isolation level/DC link (6) is connected to output stage dc energy storage electric capacity (8), and the non-same polarity of each high frequency transformer low-pressure side of isolation level is connected respectively to the mid point of output stage dc energy storage electric capacity (8); Through behind the above-mentioned line, high frequency DC/AC link, high frequency transformer and the high-frequency AC of the corresponding power converter of input stage, corresponding isolation level/DC link is formed a high pressure/isolated converter, and every phase of a multifunctional power electric transformer just is made up of a plurality of such high pressure/isolated converters; At last, output stage is composed in parallel by a plurality of identical inverter power converters, and each inverter power converter output terminal connects a corresponding LC filter as output.
2. power circuit electronic transformer as claimed in claim 1 is characterized in that the cascade of described input stage use power inverter forms; The high frequency DC/AC link of isolation level and high-frequency AC/DC link all adopts the single-phase semi-bridge circuit; Output stage adopts the inverter power converter to compose in parallel multichannel output.
3. power circuit electronic transformer as claimed in claim 1, it is characterized in that described input stage adopts cascaded topology, need not to utilize and transformer coupledly just can directly import high pressure, output stage adopts the inverter power converter parallel-connection structure of three-phase voltage source type to satisfy the needs of low-voltage and high-current.
4. power circuit electronic transformer as claimed in claim 1 is characterized in that described output stage is applicable to the three-phase three-wire system system when adopting three-phase three brachium pontis structures, then be applicable to three-phase four-wire system when adopting the three-phase four-arm structure; Can realize the output of three-phase voltage source type inverter power converter parallel multiplex, satisfy the needs of different loads requirement, particularly sensitive loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200361428U CN201369679Y (en) | 2009-03-10 | 2009-03-10 | Electronic transformer for electric power line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200361428U CN201369679Y (en) | 2009-03-10 | 2009-03-10 | Electronic transformer for electric power line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369679Y true CN201369679Y (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2009200361428U Expired - Lifetime CN201369679Y (en) | 2009-03-10 | 2009-03-10 | Electronic transformer for electric power line |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795080A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Three-phase power electronics transformer for power distribution |
| CN102055348A (en) * | 2010-12-24 | 2011-05-11 | 东南大学 | Voltage reducing power electronic transformer for distribution network |
| CN102223078A (en) * | 2011-06-08 | 2011-10-19 | 清华大学 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
| CN102281007A (en) * | 2011-08-30 | 2011-12-14 | 刘闯 | Multi-transformer switch power supply with cascaded output |
| CN104836424A (en) * | 2015-05-18 | 2015-08-12 | 国家电网公司 | Energy router with cascaded module voltage automatic balancing circuit |
| CN104935182A (en) * | 2014-03-20 | 2015-09-23 | 南车株洲电力机车研究所有限公司 | Transformer used for three-level traction current transformer |
| CN104935168A (en) * | 2014-03-20 | 2015-09-23 | 南车株洲电力机车研究所有限公司 | Multifunctional transformer used for traction transmission system |
| CN106410914A (en) * | 2016-11-10 | 2017-02-15 | 中夏新能源（上海）有限公司 | Distributed centralized power management system |
| CN106992546A (en) * | 2017-05-10 | 2017-07-28 | 三峡大学 | A kind of optimal energy allocation system of flexible direct current power distribution network |
| CN108574420A (en) * | 2017-03-08 | 2018-09-25 | 台达电子企业管理（上海）有限公司 | Technics of Power Electronic Conversion unit and system |
| CN108919016A (en) * | 2018-09-13 | 2018-11-30 | 广东电网有限责任公司 | A kind of voltage dip generator and voltage dip pilot system |
| CN111245254A (en) * | 2020-01-15 | 2020-06-05 | 清华大学 | Single-phase direct current port interconnected cascade multilevel converter |
| CN114172166A (en) * | 2021-12-07 | 2022-03-11 | 阳光电源股份有限公司 | Voltage generating device and high-frequency generation control method thereof |
| WO2022067364A1 (en) * | 2020-09-29 | 2022-04-07 | Avl List Gmbh | Dc-to-dc converter comprising a current sensor arrangement |
-
2009
- 2009-03-10 CN CNU2009200361428U patent/CN201369679Y/en not_active Expired - Lifetime
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101795080A (en) * | 2010-03-03 | 2010-08-04 | 中国科学院电工研究所 | Three-phase power electronics transformer for power distribution |
| CN102055348A (en) * | 2010-12-24 | 2011-05-11 | 东南大学 | Voltage reducing power electronic transformer for distribution network |
| CN102223078A (en) * | 2011-06-08 | 2011-10-19 | 清华大学 | Power electronic transformer aiming at distribution network and control method of power electronic transformer |
| CN102281007A (en) * | 2011-08-30 | 2011-12-14 | 刘闯 | Multi-transformer switch power supply with cascaded output |
| CN102281007B (en) * | 2011-08-30 | 2014-01-08 | 刘闯 | Multi-transformer switch power supply with cascaded output |
| CN104935168B (en) * | 2014-03-20 | 2017-11-03 | 南车株洲电力机车研究所有限公司 | Multifunction transformer for traction drive |
| CN104935182A (en) * | 2014-03-20 | 2015-09-23 | 南车株洲电力机车研究所有限公司 | Transformer used for three-level traction current transformer |
| CN104935168A (en) * | 2014-03-20 | 2015-09-23 | 南车株洲电力机车研究所有限公司 | Multifunctional transformer used for traction transmission system |
| CN104935182B (en) * | 2014-03-20 | 2017-11-07 | 南车株洲电力机车研究所有限公司 | Transformer for three level traction convertors |
| CN104836424A (en) * | 2015-05-18 | 2015-08-12 | 国家电网公司 | Energy router with cascaded module voltage automatic balancing circuit |
| CN106410914A (en) * | 2016-11-10 | 2017-02-15 | 中夏新能源（上海）有限公司 | Distributed centralized power management system |
| CN106410914B (en) * | 2016-11-10 | 2019-09-27 | 中夏新能源（上海）有限公司 | It is distributed centralized power management system |
| CN108574420A (en) * | 2017-03-08 | 2018-09-25 | 台达电子企业管理（上海）有限公司 | Technics of Power Electronic Conversion unit and system |
| CN108574420B (en) * | 2017-03-08 | 2020-02-28 | 台达电子企业管理（上海）有限公司 | Power electronic conversion unit and system |
| US10811983B2 (en) | 2017-03-08 | 2020-10-20 | Delta Electronics (Shanghai) Co., Ltd | Power electronic conversion unit and system |
| CN106992546A (en) * | 2017-05-10 | 2017-07-28 | 三峡大学 | A kind of optimal energy allocation system of flexible direct current power distribution network |
| CN108919016A (en) * | 2018-09-13 | 2018-11-30 | 广东电网有限责任公司 | A kind of voltage dip generator and voltage dip pilot system |
| CN111245254A (en) * | 2020-01-15 | 2020-06-05 | 清华大学 | Single-phase direct current port interconnected cascade multilevel converter |
| WO2022067364A1 (en) * | 2020-09-29 | 2022-04-07 | Avl List Gmbh | Dc-to-dc converter comprising a current sensor arrangement |
| CN114172166A (en) * | 2021-12-07 | 2022-03-11 | 阳光电源股份有限公司 | Voltage generating device and high-frequency generation control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091223 Effective date of abandoning: 20090310 |