CN101615847B - Automatic voltage regulator based on electric power electronic transformer - Google Patents
Automatic voltage regulator based on electric power electronic transformer Download PDFInfo
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- CN101615847B CN101615847B CN200910183231XA CN200910183231A CN101615847B CN 101615847 B CN101615847 B CN 101615847B CN 200910183231X A CN200910183231X A CN 200910183231XA CN 200910183231 A CN200910183231 A CN 200910183231A CN 101615847 B CN101615847 B CN 101615847B
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Abstract
The invention relates to an automatic voltage regulator based on an electric power electronic transformer, which belongs to the technical field of application of electric power electronics in electric systems. The automatic voltage regulator based on the electric power electronic transformer is divided into three stages: an input stage, an isolation stage and an output stage. The input stage consists of power inverters and can achieve bidirectional flow of current; the isolation stage adopts a high frequency transformer to reduce the volume of the transformer and improve the overall conversion efficiency; and the output stage also consists of power converters, and each converter is connected with a filter to improve the waveform quality of the voltage and the current. The whole device adopts mature power devices, which not only can finish the functions of voltage transformation and the energy transfer of the conventional power transformers, but also can automatically regulate the output voltage of each phase of circuit.
Description
Technical field
The present invention relates to a kind of automatic voltage adjusting device, belong to power electronics in the application on power system technical field based on electric power electric transformer.
Background technology
In power distribution network, supply line various voltage disturbances occur through regular meeting, like electric voltage dropping, rises flickering, overvoltage, under voltage etc.For the load to voltage-sensitive, like computer, communication apparatus etc. bring about great losses through regular meeting, like losing of precious data, and the interruption of communication etc.Traditional servo-type Voltagre regulator can solve the problem of supply line's voltage disturbance; But traditional servo-type Voltagre regulator goes a bucking voltage is injected by system with a variable autotransformer and isolating transformer; This structure not only dynamic response is slow, and big Industrial Frequency Transformer also is its major defect, and Industrial Frequency Transformer not only volume is big; Cost is high, and conversion efficiency is low.
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 NE BY ENERGY TRANSFER.Its outstanding feature is through 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.Based on the automatic voltage regulator of electric power electric transformer, adopt high frequency transformer to realize the traditional autotransformer and the function of isolating transformer, reduced the volume of device greatly, improved whole conversion efficiency.
Summary of the invention
Technical problem: the topological structure that the objective of the invention is to propose a kind of automatic voltage regulator based on electric power electric transformer; Not only realize voltage transformation, NE BY ENERGY TRANSFER; Can also the voltage of power transmission line be automatically adjusted; Compare the volume that traditional pressurizer has reduced device greatly, reduced loss, improved whole conversion efficiency.
Technical scheme: the invention discloses a kind of automatic voltage regulator based on electric power electric transformer, this adjuster adopts three-phase structure, and single-phase is three grades of formations, i.e. input stage, isolation level, output stage; Input stage is made up of first power inverter; Isolation level is a high frequency transformer; Output stage is made up of second power inverter; Wherein, The former limit of the output termination high frequency transformer of first power inverter; The secondary of high frequency transformer connects the input of second power inverter, and the output of second power inverter connects the input of filter, the output termination three phase supply network of filter.
The star-like connection of the input of first power inverter in the said input stage; First power inverter is connected in parallel on the uniline; First power inverter adopts the bridge type topology structure to be made up of first power switch unit, second power switch unit, the 3rd power switch unit, the 4th power switch unit; Connect the former limit of high frequency transformer anode after first power switch unit, the complementary conducting of second power switch unit; Connect the former limit of high frequency transformer negative terminal after the 3rd power switch unit, the complementary conducting of the 4th power switch unit, said each power switch unit is composed in parallel by two IGBT and an inverse parallel diode.
Second power inverter is connected on the uniline in the said output stage, and second power inverter adopts the bridge type topology structure to be made up of the 5th power switch unit, the 6th power switch unit, the 7th power switch unit, the 8th power switch unit; The positive termination high frequency transformer secondary anode of the 5th power switch unit, the 7th power switch unit; The negative terminal of the 6th power switch unit, the 8th power switch unit connects high frequency transformer secondary negative terminal, connects the first output inductor negative terminal after the 5th power switch unit, the complementary conducting of the 6th power switch unit; Connect the second output inductor negative terminal after the 7th power switch unit, the complementary conducting of the 8th power switch unit, said each power switch unit is composed in parallel by two IGBT and an inverse parallel diode;
Said filter is made up of output filter capacitor, first output inductor, second output inductor; Output filter capacitor is attempted by the end of the same name of first output inductor, second output inductor, on the termination uniline of the same name of first output inductor, second output inductor.
Three-phase structure in this device is identical and independent, and the structure of each phase all is based on AC-AC (AC-AC) type electric power electric transformer, and Fig. 1 is based on AC-AC type electric power electric transformer theory diagram.Its operation principle is: former side is converted into high-frequency signal with power frequency component through converters, and promptly raising frequency is coupled to pair side through middle high-frequency isolation transformer then, utilizes converters to be reduced into power frequency component again, i.e. frequency reducing.Through adopting suitable controlling schemes to control the work of power electronic equipment, thereby be the electric energy of another kind of frequency, voltage, waveform with the transformation of electrical energy of a kind of frequency, voltage, waveform.Electric power electric transformer is applied in the application of automatic voltage adjusting device, can regulates the voltage of output through phase shifting control easily.The phase structure of this automatic voltage adjusting device is as shown in Figure 2, adopts three grades of formations, i.e. input stage, isolation level, output stage; Input stage is made up of power inverter, and power inverter adopts the bridge type topology structure, comprises the power switch list, and each power switch unit is connected to form by two IGBT and inverse parallel diode thereof, can realize the electric current two-way flow; Isolation level is a high frequency transformer, can reduce device volume, improves whole efficiency, realizes the function of voltage transformation and NE BY ENERGY TRANSFER; Output stage is made up of power inverter; The same with input stage, power inverter also adopts the bridge type topology structure, comprises power switch unit; Each power switch unit is connected to form by two IGBT and inverse parallel diode thereof; Can realize the electric current two-way flow, the output-stage power converter also connects filter, to improve the voltage current waveform quality.The AC power frequency voltage of input is modulated to high-frequency ac voltage through former limit power inverter; Modulation operates in soft on off state through first power switch unit, second power switch unit, the 3rd power switch unit, the 4th power switch unit and realizes; Wherein first power switch unit, the complementary conducting of second power switch unit, the 3rd power switch unit, the complementary conducting of the 4th power switch unit.Secondly; The former limit of high frequency transformer high frequency modulated voltage is coupled to its secondary; By secondary and the identical in structure power inverter counter modulation of former limit, modulation operates in soft on off state through the 5th power switch unit, the 6th power switch unit, the 7th power switch unit, the 8th power switch unit and realizes then.The high frequency voltage of output is converted into desired voltage through output filter filtering.The three-phase structure of this automatic voltage adjusting device is as shown in Figure 3, is combined by phase structure, also is divided into three grades: input stage, isolation level and output stage.The input stage of this device is made up of the input stage power inverter of each phase structure, and the input of every phase power inverter is connected in parallel during work on the three phase supply network according to star-like connection; Isolation level is made up of the isolating transformer of each phase structure; Output stage is made up of the output-stage power converter of each phase structure, and the output of each phase power inverter is connected on each phase circuit of three phase supply network during work, realizes the voltage of each phase circuit is regulated automatically.When each phase line voltage distribution falls, during under voltage, the positive voltage of device output compensates line voltage distribution; When each phase line voltage distribution rises, during overvoltage, the negative voltage of device output compensates line voltage distribution; Device adopts corresponding control strategies, has good dynamic characteristics, can compensate adjusting to each phase line voltage distribution timely, can well suppress voltage fluctuation, flickering, fall, quality of voltage problems such as rising, overvoltage and under voltage.
Beneficial effect: the automatic voltage regulation technology scheme based on electric power electric transformer of the present invention; Except the advantage that possesses traditional pressurizer; Owing to adopt high frequency transformer to carry out transformation,, improved the efficient of whole device so reduced the volume of single unit system greatly; Through adopting the control corresponding mode; Can regulate regulated output voltage easily automatically; Has good dynamic characteristics; Can compensate adjusting to each phase voltage of circuit timely, can well suppress voltage fluctuation, flickering, fall, quality of voltage problem such as rising, overvoltage and under voltage.
Description of drawings
Fig. 1: the present invention is based on AC-AC type electric power electric transformer theory diagram.
Fig. 2: phase structure topological diagram of the present invention.
Wherein have: first power inverter 1, second power inverter 2, high frequency transformer 3, filter 4;
Symbol description:
Vin: the device input voltage,
Vo: the circuit output voltage,
Va: the device output voltage,
The first power switch unit S1, the second power switch unit S1, the 3rd power switch unit S2, the 4th power switch unit S2, the 5th power switch unit S3, the 6th power switch unit S3, the 7th power switch unit S4, the 8th power switch unit S4.
L1: first output inductor,
L2: second output inductor,
C1: output filter capacitor.
Fig. 3: the three-phase structure topological diagram that the present invention is based on AC-AC type electric power electric transformer.
Symbol description:
Ua, Ub, Uc: each phase voltage of three phase supply network.
Embodiment
Be that specific embodiment of the present invention further describes below:
This device adopts three-phase structure, and single-phase is three grades of formations, i.e. input stage, isolation level, output stage; Input stage is made up of first power inverter 1; Isolation level is a high frequency transformer 3; Output stage is made up of second power inverter 2; Wherein, The former limit of the output termination high frequency transformer 3 of first power inverter 1; The secondary of high frequency transformer 3 connects the input of second power inverter 2, and the output of second power inverter 2 connects the input of filter 4, the output termination three phase supply network of filter 4.
In automatic voltage regulator based on electric power electric transformer; The star-like connection of the input of each phase power inverter in the input stage; Power inverter is connected in parallel on each phase circuit of three phase supply network; First power inverter 1 adopts the bridge type topology structure to be made up of the first power switch unit S1, the second power switch unit S1, the 3rd power switch unit S2, the 4th power switch unit S2; Connect high frequency transformer 3 former limit anodes after the power switch unit first power switch unit S1, the complementary conducting of the second power switch unit S1; Connect high frequency transformer 3 former limit negative terminals after the 3rd power switch unit S2, the complementary conducting of the 4th power switch unit S2, said each power switch unit is composed in parallel by two IGBT and an inverse parallel diode; The output of power inverter is connected on each phase circuit of three phase supply network in the output stage; Second power inverter 2 adopts the bridge type topology structure to be made up of the 5th power switch unit S3, the 6th power switch unit S3, the 7th power switch unit S4, the 8th power switch unit S4; The positive termination high frequency transformer 3 secondary ends of the 5th power switch unit S3, the 7th power switch unit S4; The negative terminal of the 6th power switch unit S3, the 8th power switch unit S4 connects high frequency transformer 3 secondary negative terminals; Connect the first output inductor L1 negative terminal after merit the 5th power switch unit S3, the complementary conducting of the 6th power switch unit S3; Connect the second output inductor L2 negative terminal after the 7th power switch unit S4, the complementary conducting of the 8th power switch unit S4, said each power switch unit is composed in parallel by two IGBT and an inverse parallel diode; Filter 4 is made up of output filter capacitor C1, the first output inductor L1, the second output inductor L2; Output filter capacitor C1 is attempted by the end of the same name of the first output inductor L1, the second output inductor L2, the termination three phase supply network of the same name of the first output inductor L1, the second output inductor L2.
Based on the automatic voltage regulator control method of electric power electric transformer, when each phase line voltage distribution falls, during under voltage, the positive voltage of device output compensates line voltage distribution; When line voltage distribution rises, during overvoltage, the negative voltage of device output compensates line voltage distribution.
This device is based on the automatic voltage regulator of AC-AC type electric power electric transformer, and its input stage also is connected in the three phase supply network, and output stage respectively is in series and is connected on the three phase supply network, realizes each phase voltage is regulated.The three-phase structure of this device is identical and independent; The operation principle of each phase is identical; Be: former side is converted into high-frequency signal (its frequency is that 600Hz is to 1.2kHz) with the power-frequency voltage signal through first power inverter 1, and promptly raising frequency is coupled to pair side through middle high frequency transformer 3 then; Utilize second power inverter 2 to be reduced into power-frequency voltage signal, i.e. frequency reducing synchronously again.Through phase shifting control, can change the amplitude of fundamental voltage output of voltage, need extra output filter 4 simultaneously.
The structure of this each phase of device is all identical, comprises following composition: adopt three grades of formations, i.e. input stage, isolation level, output stage; Input stage is made up of first power inverter 1; Power inverter adopts the bridge type topology structure; Comprise the first power switch unit S1, the second power switch unit S1, the 3rd power switch unit S2, the 4th power switch unit S2; Each power switch unit is connected to form by two IGBT and inverse parallel diode thereof, can realize the electric current two-way flow; Isolation level is a high frequency transformer 3, can reduce device volume, improves whole efficiency, realizes the function of voltage transformation and NE BY ENERGY TRANSFER; Output stage is made up of second power inverter 2; The same with input stage, power inverter also adopts the topological structure of bridge-type, comprises the 5th power switch unit S3, the 6th power switch unit S3, the 7th power switch unit S4, the 8th power switch unit S4; Each power switch unit is connected to form by two IGBT and inverse parallel diode thereof; Can realize the electric current two-way flow, the output-stage power converter also connects filter 4, to improve the voltage current waveform quality.The AC power frequency voltage of input is modulated to high-frequency ac voltage through former limit first power inverter 1; Modulation operates in soft on off state through the first power switch unit S1, the second power switch unit S1, the 3rd power switch unit S2, the 4th power switch unit S2 and realizes; The wherein first power switch unit S1, the complementary conducting of the second power switch unit S1S1, the 3rd power switch unit S2, the complementary conducting of the 4th power switch unit S2.Secondly; High frequency transformer 3 former limit high frequency modulated voltages are coupled to its secondary; By secondary and identical in structure power inverter 2 counter modulation of former limit, modulation operates in soft on off state through the 5th power switch unit S3, the 6th power switch unit S3, the 7th power switch unit S4, the 8th power switch unit S4 and realizes then.The high frequency voltage of output is converted into desired voltage through output filter filtering.
The three-phase structure of this device is to be combined by each phase structure, and its input stage is connected in parallel on the three-phase power line, and output stage respectively is in series on three-phase power line.Phase structure with this device is an example, and the input terminal voltage that its pressure regulation process: Vin is a device is described, Va is the output end voltage of device, this voltage overlapped in series in supply line, thereby circuit output voltage V o is regulated Vo=Vin+Va wherein.When line voltage distribution falls, during under voltage, the positive voltage Va of device output compensates line voltage distribution Vo; When line voltage distribution rises, during overvoltage, the negative voltage Va of device output compensates line voltage distribution Vo; Device adopts corresponding control strategies, has good dynamic characteristics, can compensate adjusting to line voltage distribution timely, can well suppress voltage fluctuation, flickering, fall, quality of voltage problems such as rising, overvoltage and under voltage.
Claims (2)
1. the automatic voltage regulator based on electric power electric transformer is characterized in that this adjuster adopts three-phase structure, and single-phase is three grades of formations, i.e. input stage, isolation level, output stage; Input stage is made up of first power inverter (1); Isolation level is high frequency transformer (3); Output stage is made up of second power inverter (2); Wherein, The former limit of the output termination high frequency transformer (3) of first power inverter (1); The secondary of high frequency transformer (3) connects the input of second power inverter (2); The output of second power inverter (2) connects the input of filter (4), the output termination three phase supply network of filter (4);
The star-like connection of input of first power inverter (1) in the said input stage; First power inverter (1) is connected in parallel on the uniline; First power inverter (1) adopts the bridge type topology structure to be made up of first power switch unit (S1), second power switch unit
the 3rd power switch unit (S2), the 4th power switch unit
; Connect the former limit of high frequency transformer (3) anode after first power switch unit (S1), the complementary conducting of second power switch unit
; Connect the former limit of high frequency transformer (3) negative terminal after the 3rd power switch unit (S2), the complementary conducting of the 4th power switch unit
, said each power switch unit is composed in parallel by two IGBT and an inverse parallel diode;
Second power inverter (2) is connected on the uniline in the said output stage, and second power inverter (2) adopts the bridge type topology structure to be made up of the 5th power switch unit (S3), the 6th power switch unit
the 7th power switch unit (S4), the 8th power switch unit
; Positive termination high frequency transformer (3) the secondary anode of the 5th power switch unit (S3), the 7th power switch unit (S4); The negative terminal of the 6th power switch unit
the 8th power switch unit
connects high frequency transformer (3) secondary negative terminal, connects first output inductor (L1) negative terminal after the 5th power switch unit (S3), the complementary conducting of the 6th power switch unit
; Connect second output inductor (L2) negative terminal after the 7th power switch unit (S4), the complementary conducting of the 8th power switch unit
, said each power switch unit is composed in parallel by two IGBT and an inverse parallel diode.
2. the automatic voltage regulator based on electric power electric transformer as claimed in claim 1; It is characterized in that said filter (4) is made up of output filter capacitor (C1), first output inductor (L1), second output inductor (L2); Output filter capacitor (C1) is attempted by the end of the same name of first output inductor (L1), second output inductor (L2), on the termination uniline of the same name of first output inductor (L1), second output inductor (L2).
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| CN200910183231XA CN101615847B (en) | 2009-07-23 | 2009-07-23 | Automatic voltage regulator based on electric power electronic transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910183231XA CN101615847B (en) | 2009-07-23 | 2009-07-23 | Automatic voltage regulator based on electric power electronic transformer |
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| CN101615847A CN101615847A (en) | 2009-12-30 |
| CN101615847B true CN101615847B (en) | 2012-04-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103227474B (en) * | 2012-01-31 | 2015-08-19 | 同济大学 | A kind of photovoltaic power generation grid-connecting system based on solid-state transformer |
| CN105932883B (en) * | 2016-06-03 | 2018-09-21 | 中南大学 | Electric power electric transformer based on the direct AC-AC converters of energy injection type |
| CN106452096B (en) * | 2016-09-05 | 2019-08-27 | 全球能源互联网研究院有限公司 | A kind of bridge structure, converter circuit and electric power electric transformer |
| CN110086355B (en) * | 2019-04-29 | 2020-05-22 | 西安交通大学 | High-frequency control compensation type controllable alternating current distribution transformer |
| CN110212781B (en) * | 2019-06-14 | 2021-01-29 | 燕山大学 | Single-phase current type high-frequency chain matrix type power electronic transformer topology and modulation method |
| CN111628665B (en) * | 2020-05-30 | 2022-09-27 | 青岛鼎信通讯股份有限公司 | Medium-high voltage power electronic transformer based on series digital voltage stabilizer |
| CN112421964B (en) * | 2020-11-12 | 2022-10-28 | 燕山大学 | Three-phase-single-phase high-frequency chain matrix type PET topology modulation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1348248A (en) * | 2001-09-10 | 2002-05-08 | 南京航空航天大学 | High-frequency AC/AC converter with AC link |
| CN1560989A (en) * | 2004-02-18 | 2005-01-05 | 华中科技大学 | On-load smooth regulating trnsformer |
| CN201499090U (en) * | 2009-07-23 | 2010-06-02 | 东南大学 | Automatic voltage regulation device for power electronic transformer |
-
2009
- 2009-07-23 CN CN200910183231XA patent/CN101615847B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1348248A (en) * | 2001-09-10 | 2002-05-08 | 南京航空航天大学 | High-frequency AC/AC converter with AC link |
| CN1560989A (en) * | 2004-02-18 | 2005-01-05 | 华中科技大学 | On-load smooth regulating trnsformer |
| CN201499090U (en) * | 2009-07-23 | 2010-06-02 | 东南大学 | Automatic voltage regulation device for power electronic transformer |
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| CN101615847A (en) | 2009-12-30 |
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Application publication date: 20091230 Assignee: NANJING KEWO ELECTRIC POWER TECHNOLOGY CO., LTD. Assignor: Southeast University Contract record no.: 2013320000217 Denomination of invention: Automatic voltage regulator based on electric power electronic transformer Granted publication date: 20120418 License type: Exclusive License Record date: 20130322 |
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