CN102055348A - Voltage reducing power electronic transformer for distribution network - Google Patents
Voltage reducing power electronic transformer for distribution network Download PDFInfo
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- CN102055348A CN102055348A CN2010106030089A CN201010603008A CN102055348A CN 102055348 A CN102055348 A CN 102055348A CN 2010106030089 A CN2010106030089 A CN 2010106030089A CN 201010603008 A CN201010603008 A CN 201010603008A CN 102055348 A CN102055348 A CN 102055348A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a voltage reducing power electronic transformer for a distribution network. Structures of single phases in a three-phase circuit are the same and independent; each phase comprises an input level, an isolation level and an output level; the input level of the single phase is formed by cascading a plurality of same power transformers to adapt high-voltage input, and the power transformer comprises an uncontrolled rectifier bridge and a boost-based power factor correction circuit; the isolation level comprises a high-frequency direct current (DC)/ alternating current (AC) link, a high-frequency transformer and a high-frequency AC/DC link, and a parallel mode is adopted in the output level of an isolation level module of each phase to adapt a high-power load; and the output level consists of a three-phase voltage source converter of four bridge arms, three-path output can be realized according to the requirement of the load, and the converter of the output level is also connected with a liquid crystal (LC) filter to improve the waveform quality of the voltage and the current. The power electronic transformer can improve the conversion efficiency at the same time of reducing the production cost, improve the reliability of a device, adapt different load requirements of the distribution network and improve the flexibility in the use of the distribution network, and has good application prospect.
Description
Technical field
The present invention relates to a kind of power transmission and distribution device that can realize multiple function, be specifically related to a kind of voltage-dropping type electric power electric transformer that is used for distribution.
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, 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.Along with power electronic device level and high frequency transformer Development of Materials, electric power electric transformer will be brought into play indispensable effect in intelligent grid.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of voltage-dropping type electric power electric transformer that is used for distribution, not only can realize voltage transformation, the voltage isolation of traditional transformer, the simple functions of energy delivery, can also realize reactive power compensation, harmonic wave control and intelligent grid under some new demands.
Technical scheme: for achieving the above object, a kind of voltage-dropping type electric power electric transformer that is used for distribution of the present invention, each phase structure is identical and independent in its three-phase circuit, every input stage, isolation level and output stage of comprising mutually, described input stage is formed by some identical power inverter cascades, can adapt to the high voltage input like this, the power inverter DC side connects corresponding dc energy storage electric capacity; Described isolation level comprises high frequency DC/AC link, high frequency transformer and high-frequency AC/DC link; Described output stage is made of the three-phase inverter of four brachium pontis, the corresponding series filter of each inverter power converter AC side; The input of three-phase adopts the Y type to connect, and the output of the isolation level of every phase adopts mode in parallel to connect, and can adapt to high power load like this.
Described output stage adopts the three-phase four-arm structure to be applicable to three-phase four-wire system, and the output of No. three inverters that the three-phase input is corresponding can adopt separately three tunnel outputs or mode in parallel to export to adapt to the power distribution network load request.
The cascade number of the power inverter of described input stage and the voltage of input side are suitable, described power inverter comprises not control rectifying circuit and by inductance of the H bridge be made up of four diodes, the circuit of power factor correction that insulated gate bipolar transistor (IGBT) and the 5th diode are formed based on boost, described H bridge is thyristor in parallel between two end lines of control rectifying circuit output DC side not, the anode series inductance of DC side, insulated gate bipolar transistor in parallel between two end lines of DC side again, subsequently at the anode of DC side the 5th diode of connecting, and parallel connection direct storage capacitor between two end lines of DC side again.
The full bridge inverter that described DC/AC link adopts four insulated gate bipolar transistors to form, the full-bridge that four diodes of AC/DC link employing are formed is control rectifying circuit not.Specifically, described four insulated gate bipolar transistors are first insulated gate bipolar transistor, second insulated gate bipolar transistor, the 3rd insulated gate bipolar transistor and the 4th insulated gate bipolar transistor, series resonance electric capacity connects the former limit of high frequency transformer anode after first insulated gate bipolar transistor, the second insulated gate bipolar transistor conducting, connects the former limit of high frequency transformer negative terminal after the 3rd insulated gate bipolar transistor, the 4th insulated gate bipolar transistor conducting; Four diodes comprise first diode, second diode, the 3rd diode and the 4th diode, connection mid point after first diode, the series connection of second diode connects the secondary anode of high frequency transformer, connection mid point after the 3rd diode, the series connection of the 4th diode connects the secondary negative terminal of high frequency transformer, the DC side output is connected in parallel on the second dc energy storage electric capacity, and this second dc energy storage electric capacity is in order to improve the power of output.
Described filter is made up of output inductor and output filter capacitor, can improve the voltage current waveform quality.
Beneficial effect: a kind of voltage-dropping type electric power electric transformer that is used for distribution of the present invention compared with prior art, except the advantage that possesses the conventional electric power electronic transformer, also has the following advantages:
1, the present invention is provided with the bypass thyristor at each input module, can excise the normal operation that this module does not influence whole system when certain input power unit module breaks down, and improves the reliability of device greatly;
2, the present invention increases resonant capacitance isolating the AC/DC module, and the realization by the isolation module resonant type soft-switch reduces the wastage, and improves the conversion efficiency of electric power electric transformer;
3, multichannel of the present invention output can adapt to the different loads requirement of distribution, can adopt the mode of multichannel output-parallel for high power load, improves the flexibility that it uses in distribution;
4, the present invention is connected in the distribution system, 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;
5, the amplitude of former secondary AC side voltage of the present invention, electric current and phase place can be carried out the continuous controllable adjusting, 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;
6, the present invention adopts modularized design, can offer convenience for its assembling, enhances productivity greatly.
Description of drawings
Fig. 1 is a kind of single-phase theory diagram that is used for the voltage-dropping type electric power electric transformer of distribution of the present invention;
Fig. 2 is a kind of whole theory diagram of three-phase that is used for the voltage-dropping type electric power electric transformer of distribution of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
As depicted in figs. 1 and 2, a kind of voltage-dropping type electric power electric transformer that is used for distribution, each phase structure is identical and independent in its three-phase circuit, every input stage, isolation level and output stage of comprising mutually, input stage is formed by some identical power inverter cascades, can adapt to the high voltage input, the power inverter DC side connects corresponding dc energy storage electric capacity 1; Isolation level comprises high frequency DC/AC link, high frequency transformer and high-frequency AC/DC link; Output stage is made of the three-phase inverter of four brachium pontis, the corresponding series filter 2 of each inverter power converter AC side, and the LC filter that filter 2 is made up of output inductor and output filter capacitor, it can improve the voltage current waveform quality; The input of three-phase adopts the Y type to connect, and the output of the isolation level of every phase adopts mode in parallel to connect, and it can adapt to high power load.
Specifically, the cascade number of the power inverter of input stage and the voltage of input side are suitable, power inverter comprises not control rectifying circuit and by inductance 4 of the H bridge be made up of four diodes 3, the circuit of power factor correction that insulated gate bipolar transistor 5 and the 5th diode 6 are formed based on boost, the H bridge is thyristor 7 in parallel between two end lines of control rectifying circuit output DC side not, the anode series inductance 4 of DC side, insulated gate bipolar transistor 5 in parallel between two end lines of DC side again, subsequently at the anode of DC side the 5th diode 6 of connecting, and parallel connection direct storage capacitor 1 between two end lines of DC side again.
The full bridge inverter that the DC/AC link adopts four insulated gate bipolar transistors to form, the full-bridge that four diodes of AC/DC link employing are formed is control rectifying circuit not.Specifically, four insulated gate bipolar transistors are first insulated gate bipolar transistor 11, second insulated gate bipolar transistor 12, the 3rd insulated gate bipolar transistor 13 and the 4th insulated gate bipolar transistor 14, series resonance electric capacity 8 connects the former limit of high frequency transformer anode after first insulated gate bipolar transistor 11,12 conductings of second insulated gate bipolar transistor, connects the former limit of high frequency transformer negative terminal after the 3rd insulated gate bipolar transistor 13,14 conductings of the 4th insulated gate bipolar transistor; Four diodes comprise first diode 21, second diode 22, the 3rd diode 23 and the 4th diode 24, connection mid point after first diode 21,22 series connection of second diode connects the secondary anode of high frequency transformer, connection mid point after the 3rd diode 23,24 series connection of the 4th diode connects the secondary negative terminal of high frequency transformer, the DC side output is connected in parallel on the second dc energy storage electric capacity 9, and this second dc energy storage electric capacity 9 is in order to improve the power of output.
A kind of voltage-dropping type electric power electric transformer that is used for distribution of the present invention, its output stage adopts the three-phase four-arm structure to be applicable to three-phase four-wire system, and the output of No. three inverters that the three-phase input is corresponding can adopt separately three tunnel outputs or mode in parallel to export to adapt to the power distribution network load request.
The above only is a preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. voltage-dropping type electric power electric transformer that is used for distribution, it is characterized in that: each phase structure is identical and independent in its three-phase circuit, every input stage, isolation level and output stage of comprising mutually, described input stage is formed by some identical power inverter cascades, and the power inverter DC side connects corresponding dc energy storage electric capacity (1); Described isolation level comprises high frequency DC/AC link, high frequency transformer and high-frequency AC/DC link; Described output stage is made of the three-phase inverter of four brachium pontis, the corresponding series filter (2) of each inverter power converter AC side; The input of three-phase adopts the Y type to connect, and the output of the isolation level of every phase adopts mode in parallel to connect.
2. a kind of voltage-dropping type electric power electric transformer that is used for distribution according to claim 1, it is characterized in that: the cascade number of the power inverter of described input stage and the voltage of input side are suitable, described power inverter comprises not control rectifying circuit and by inductance (4) of the H bridge be made up of four diodes (3), the circuit of power factor correction that insulated gate bipolar transistor (5) and the 5th diode (6) are formed based on boost, described H bridge is thyristor in parallel (7) between two end lines of control rectifying circuit output DC side not, the anode series inductance (4) of DC side, insulated gate bipolar transistor in parallel (5) between two end lines of DC side again, subsequently at the anode of DC side the 5th diode (6) of connecting, and parallel connection direct storage capacitor (1) between two end lines of DC side again.
3. a kind of voltage-dropping type electric power electric transformer that is used for distribution according to claim 1 and 2, it is characterized in that: the full bridge inverter that described DC/AC link adopts four insulated gate bipolar transistors to form, the full-bridge that four diodes of AC/DC link employing are formed is control rectifying circuit not.
4. a kind of voltage-dropping type electric power electric transformer that is used for distribution according to claim 3, it is characterized in that: described four insulated gate bipolar transistors are first insulated gate bipolar transistor (11), second insulated gate bipolar transistor (12), the 3rd insulated gate bipolar transistor (13) and the 4th insulated gate bipolar transistor (14), first insulated gate bipolar transistor (11), series resonance electric capacity (8) connects the former limit of high frequency transformer anode, the 3rd insulated gate bipolar transistor (13) after second insulated gate bipolar transistor (12) conducting, connect the former limit of high frequency transformer negative terminal after the 4th insulated gate bipolar transistor (14) conducting; Four diodes comprise first diode (21), second diode (22), the 3rd diode (23) and the 4th diode (24), connection mid point after first diode (21), second diode (22) series connection connects the secondary anode of high frequency transformer, connection mid point after the 3rd diode (23), the 4th diode (24) series connection connects the secondary negative terminal of high frequency transformer, and the DC side output is connected in parallel on the second dc energy storage electric capacity (9).
5. a kind of voltage-dropping type electric power electric transformer that is used for distribution according to claim 1, it is characterized in that: described filter (2) is made up of output inductor and output filter capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106030089A CN102055348A (en) | 2010-12-24 | 2010-12-24 | Voltage reducing power electronic transformer for distribution network |
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| CN2010106030089A CN102055348A (en) | 2010-12-24 | 2010-12-24 | Voltage reducing power electronic transformer for distribution network |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973129A (en) * | 2014-04-04 | 2014-08-06 | 广西电网公司电力科学研究院 | Soft-switching power electronic transformer |
| CN104362670A (en) * | 2014-10-21 | 2015-02-18 | 上海电机学院 | Non-schedulable solar power generation and mains supply complementary system |
| CN105960689A (en) * | 2014-02-03 | 2016-09-21 | 韩国铁道技术研究院 | Transformer for resonant power converter using winding method for reducing leakage flux |
| WO2016206269A1 (en) * | 2015-06-24 | 2016-12-29 | 中兴通讯股份有限公司 | Power conversion device and configuration method thereof |
| CN106324424A (en) * | 2016-10-31 | 2017-01-11 | 广西电网有限责任公司电力科学研究院 | Method for analyzing H bridge topology state of power electronic transformer |
| CN106716812A (en) * | 2014-08-29 | 2017-05-24 | 新电元工业株式会社 | Power factor improving converter and power supply device including power factor improving converter |
| CN107911039A (en) * | 2017-12-15 | 2018-04-13 | 天水电气传动研究所有限责任公司 | A kind of mixed type dynamic power supplies |
| WO2018126554A1 (en) * | 2017-01-04 | 2018-07-12 | 广东百事泰电子商务股份有限公司 | Smart correction wave voltage conversion circuit based on pfc, full bridge, and half bridge |
| CN109873571A (en) * | 2017-12-04 | 2019-06-11 | 邹晓灵 | A kind of general inverter and its control method |
| RU2747776C1 (en) * | 2020-09-21 | 2021-05-14 | Открытое акционерное общество "Специальное конструкторское бюро приборостроения и автоматики" | Voltage converter |
| CN113991635A (en) * | 2021-10-28 | 2022-01-28 | 广东电网有限责任公司 | Double-loop low-voltage direct-current power distribution system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105960689B (en) * | 2014-02-03 | 2017-12-15 | 韩国铁道技术研究院 | The mode of resonance power converter transformer of winding method is reduced using leakage magnetic flux |
| CN105960689A (en) * | 2014-02-03 | 2016-09-21 | 韩国铁道技术研究院 | Transformer for resonant power converter using winding method for reducing leakage flux |
| CN103973129A (en) * | 2014-04-04 | 2014-08-06 | 广西电网公司电力科学研究院 | Soft-switching power electronic transformer |
| US10601308B2 (en) | 2014-08-29 | 2020-03-24 | Shindengen Electric Manufacturing Co., Ltd. | Power factor improving converter, and power supply device including power factor improving converter |
| CN106716812A (en) * | 2014-08-29 | 2017-05-24 | 新电元工业株式会社 | Power factor improving converter and power supply device including power factor improving converter |
| CN104362670A (en) * | 2014-10-21 | 2015-02-18 | 上海电机学院 | Non-schedulable solar power generation and mains supply complementary system |
| WO2016206269A1 (en) * | 2015-06-24 | 2016-12-29 | 中兴通讯股份有限公司 | Power conversion device and configuration method thereof |
| US10284093B2 (en) | 2015-06-24 | 2019-05-07 | Zte Corporation | Power conversion apparatus and method for configuring the same |
| CN106324424A (en) * | 2016-10-31 | 2017-01-11 | 广西电网有限责任公司电力科学研究院 | Method for analyzing H bridge topology state of power electronic transformer |
| WO2018126554A1 (en) * | 2017-01-04 | 2018-07-12 | 广东百事泰电子商务股份有限公司 | Smart correction wave voltage conversion circuit based on pfc, full bridge, and half bridge |
| CN109873571A (en) * | 2017-12-04 | 2019-06-11 | 邹晓灵 | A kind of general inverter and its control method |
| CN107911039A (en) * | 2017-12-15 | 2018-04-13 | 天水电气传动研究所有限责任公司 | A kind of mixed type dynamic power supplies |
| RU2747776C1 (en) * | 2020-09-21 | 2021-05-14 | Открытое акционерное общество "Специальное конструкторское бюро приборостроения и автоматики" | Voltage converter |
| CN113991635A (en) * | 2021-10-28 | 2022-01-28 | 广东电网有限责任公司 | Double-loop low-voltage direct-current power distribution system |
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Application publication date: 20110511 |