CN102064712A - Power electronic transformer based on simple PFC (Power Factor Correction) - Google Patents
Power electronic transformer based on simple PFC (Power Factor Correction) Download PDFInfo
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- CN102064712A CN102064712A CN2010106035631A CN201010603563A CN102064712A CN 102064712 A CN102064712 A CN 102064712A CN 2010106035631 A CN2010106035631 A CN 2010106035631A CN 201010603563 A CN201010603563 A CN 201010603563A CN 102064712 A CN102064712 A CN 102064712A
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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
Abstract
The invention discloses a power electronic transformer based on simple PFC (Power Factor Correction). All single phase structures in a three-phase circuit are same and independent to each other, wherein each phase comprises an input grade, an isolation grade and an output grade; input ends of an input-grade power transformer group and an output-grade power transformer group of each single phase are connected in a star shape; the input grade of each single phase adopts a series connection way; the input-grade power transformer group comprises a diode bridge-type circuit and a buck circuit and can realize the control of a power factor, and the alternating side of each power transformer group is connected in parallel with a pressure sensitive resistor; the isolation grade comprises a high-frequency DC/AC, a high-frequency transformer and a high-frequency AC/DC link, wherein a primary edge of the high-frequency transformer is connected in series with a capacitor, and the loss consumption of a switch tube is reduced under the action of a resonance soft switch; an output side of the isolation grade adopts a parallel connection way; and the output-grade power transformer group adopts a bridge-type inverting circuit, and an output side of the output-grade power transformer group is also connected with a filter. The invention has the advantages of simplifying the circuit structure, reducing the cost, realizing the power factor correction and resonance soft switch and increasing the conversion efficiency.
Description
Technical field
The present invention relates to a kind of electric power electric transformer that is applied in power distribution network, be specifically related to a kind of electric power electric transformer based on simple and easy PFC.
Background technology
Traditional power transformer adopts iron core oil-immersed type usually, has simple, the reliability advantages of higher of manufacture craft, but shortcoming is also fairly obvious, big as volume, weight, no-load loss is higher, and insulating oil exists environment and threatens, function ratio is more single, easily cause output voltage to descend, produce harmonic wave during overload, when dropping into electrical network, also can cause bigger magnetizing inrush current, cause pollution electrical network.The shortcoming of conventional electric power transformer and single function are difficult to satisfy the demand and the target of following power grid construction.As a kind of novel energy conversion equipment, power transformer has that volume is little, in light weight, no-load loss is little, the wet goods advantage that do not need to insulate, and can finely substitute traditional power transformer and be applied in the electrical power trans mission/distribution system, has boundless prospect.
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.And the English full name of PFC is " Power Factor Correction ", the meaning is " power factor correction ", power factor refers to the relation between effective power and the total power consumption (apparent power), and just effective power is divided by the ratio of total power consumption (apparent power).Basically power factor (PF) can be weighed the degree that electric power is used effectively, and when the power factor (PF) value is big more, represents its electric power utilance high more.
Existing too much about switching device in the electric power electric transformer patent both at home and abroad at present, cost is higher, and switching loss is bigger, and conversion efficiency is not high, and this has influenced the promotion and application of electric power electric transformer to a certain extent.But 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
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention proposes a kind of electric power electric transformer based on simple and easy PFC, compares traditional power transformer, and the volume that it can reduce transformer greatly reduces the wastage, and improves whole conversion efficiency.
Technical scheme: for solving the problems of the technologies described above, a kind of electric power electric transformer of the present invention based on simple and easy PFC, each phase structure is identical and independent in its three-phase circuit, every input stage, isolation level and output stage of comprising mutually; The input of the power inverter group of each single-phase input stage and the power inverter group of output stage is connected by star-like respectively; The power inverter group of each single-phase input stage comprises first power inverter, and first power inverter comprises diode-bridge circuit and buck circuit, first power inverter AC side piezo-resistance in parallel, and DC side connects corresponding dc energy storage electric capacity; Isolation level comprises the second rate converter as high frequency DC/AC link, high frequency transformer and as the 3rd power inverter of high-frequency AC/DC link; The power inverter group of output stage comprises the 4th power inverter, and it adopts the voltage-source type bridge inverter main circuit; Connect the input of second power inverter behind the output parallel connection direct storage capacitor of first power inverter, connect the former limit of high frequency transformer after the output series capacitance of second power inverter, the secondary of high frequency transformer connects the input of the 3rd power inverter, connect the input of the 4th power inverter behind the output of the 3rd power inverter and the last dc energy storage electric capacity, the corresponding input that connects filter of the output of the 4th power inverter, the output termination three phase supply network of filter.
The diode-bridge circuit of described input stage comprises first power diode, second power diode, the 3rd power diode, the 4th power diode, described buck circuit comprises power switch pipe, power diode, reactor and capacitor, first power diode, connection mid point after the series connection of second power diode connects and exchanges the input side negative terminal, the 3rd power diode, connection mid point after the series connection of the 4th power diode connects and exchanges the input side anode, exchange input side piezo-resistance also in parallel, thyristor in parallel between two end lines of diode rectifier bridge output DC side, the anode series connection power switch pipe of DC side, parallel diode between two end lines of DC side again, subsequently at the anode series reactor of DC side, and shunt capacitor between two end lines of DC side again.
Described second power inverter is by first power switch unit, second power switch unit, the 3rd power switch unit, the 4th power switch unit is formed the bridge type topology structure, first power switch unit, series capacitor connects the former limit of high frequency transformer anode after the complementary conducting of second power switch unit, the 3rd power switch unit, connect the former limit of high frequency transformer negative terminal after the complementary conducting of the 4th power switch unit, described the 3rd power inverter is by the 5th power diode, the 6th power diode, the 7th power diode, the 8th power diode is formed bridge circuit, the 5th power diode, connection mid point after the series connection of the 6th power diode connects the secondary anode of high frequency transformer, the 7th power diode, connection mid point after the series connection of the 8th power diode connects the secondary negative terminal of high frequency transformer, and the DC side output is connected in parallel on the same dc energy storage electric capacity.
Described the 4th power inverter is by the 5th power switch unit, the 6th power switch unit, the 7th power switch unit, the 8th power switch unit is formed the bridge type topology structure, the 5th power switch unit, positive termination the 3rd power inverter output plus terminal of the 7th power switch unit, the 6th power switch unit, the negative terminal of the 8th power switch unit connects the 3rd power inverter output negative terminal, the 5th power switch unit, connect the input of filter after the complementary conducting of the 6th power switch unit, the 7th power switch unit, connect the input of filter after the complementary conducting of the 8th power switch unit.
Described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT.
Described filter is made up of output inductor and output filter capacitor.
A kind of electric power electric transformer of the present invention based on simple and easy PFC, its prime power unit is based on AC-DC-AC-DC-AC type electric power electric transformer, the groundwork principle of prime power cellular construction is: the AC side of input stage piezo-resistance in parallel, shield, input stage is converted into direct current signal with the industrial frequency AC signal by uncontrollable rectification of diode and buck reduction voltage circuit, it is the AC-DC link, and the realization power factor controlling, can also reduce the voltage stress of switching tube device by the buck reduction voltage circuit; Thyristor in parallel between diode bridge rectifier circuit and the buck circuit has certain fault-tolerant ability in the input stage; By second power inverter in the isolation level direct current signal is converted into high-frequency square-wave signal, it is the DC-AC link, connect the former limit of high-frequency isolation transformer behind the last electric capacity of output series connection of second power inverter, and can play the resonant type soft-switch effect, thus reduce switching loss, improve conversion efficiency, the secondary of high-frequency isolation transformer is converted into direct current signal by the uncontrollable rectification of diode, be the AC-DC link, be reduced into the industrial frequency AC signal by the 4th power inverter again, be i.e. the DC-AC link; Control the work of power electronic equipment by suitable control strategy, thereby be the electric energy of another kind of frequency, voltage, waveform the transformation of electrical energy of a kind of frequency, voltage, waveform.
First power inverter is connected in series in each single-phase input stage, thereby can directly insert the high pressure of different brackets; Each single-phase isolation level connects as the DC side parallel of the 3rd power inverter of high-frequency AC/DC link; Output stage adopts the bridge power converter structure, and filter is made up of output inductor and output filter capacitor.
Beneficial effect: a kind of electric power electric transformer of the present invention based on simple and easy PFC, it compared with prior art except the advantage that possesses the conventional electric power transformer, also has the following advantages:
1, a kind of electric power electric transformer of the present invention based on simple and easy PFC, it realizes power factor correction by the buck circuit, can significantly reduce the number of the switching tube of this part;
2, a kind of electric power electric transformer of the present invention based on simple and easy PFC, it adopts the mode of prime power unit combination to constitute, single-phase input stage adopts the input stage power inverter by the prime power unit to be connected in series, be convenient to flexible Application on the power distribution network circuit of each electric pressure, can directly import high pressure;
3, a kind of electric power electric transformer of the present invention based on simple and easy PFC, the realization of its isolation level resonant capacitance and resonant type soft-switch can reduce switching loss to a certain extent, improves the whole conversion efficiency of device;
4, a kind of electric power electric transformer based on simple and easy PFC of the present invention, thyristor also in parallel in the middle of its input stage makes this electric power electric transformer have fault-tolerant ability by suitable control.
Description of drawings
Fig. 1 is the single-phase overall structure schematic diagram of the electric power electric transformer based on simple and easy PFC of the present invention;
Fig. 2 is the three-phase block mold block diagram of the electric power electric transformer based on simple and easy PFC of the present invention;
Fig. 3 adopts the phase structure schematic diagram of three level structures for the output stage of the electric power electric transformer based on simple and easy PFC of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is done further explanation.
As shown in Figure 2, a kind of electric power electric transformer of the present invention based on simple and easy PFC, each phase structure is identical and independent in its three-phase circuit, every input stage, isolation level and output stage of comprising mutually, and this input stage, isolation level and output stage comprise the power inverter group respectively; The input of the power inverter group of each single-phase input stage and the power inverter group of output stage is connected by star-like respectively.Isolation level comprises high frequency DC/AC link, high frequency transformer and high-frequency AC/DC link; Phase structure comprises the input of prime power unit piezo-resistance R in parallel, wherein, the input of output termination second power inverter 2 of first power inverter 1, the former limit of the output termination high frequency transformer 3 of second power inverter 2, the secondary of high frequency transformer 3 connects the input of the 3rd power inverter 4, the input of output termination the 4th power inverter 5 of the 3rd power inverter 4; The output of prime power unit connects the input of filter 6, and filter 6 is the LC filter of being made up of output inductor La1 and output filter capacitor Ca1, and the output of this filter 6 links to each other with the three phase supply network.
As shown in Figure 1, first power inverter 1 adopts by the first power diode D1 in each phase input stage, the second power diode D2, the 3rd power diode D3, the bridge circuit that the 4th power diode D4 forms connects by power switch tube S, power diode D, the buck circuit that reactor L1 and capacitor C1 form constitutes, the first power diode D1, connect after the complementary conducting of the second power diode D2 and exchange the input side negative terminal, the 3rd power diode D3, connect after the complementary conducting of the 4th power diode D4 and exchange the input side anode, exchange an input side piezo-resistance R also in parallel, thyristor T in parallel between two end lines of diode rectifier bridge output DC side, the anode series connection power switch tube S of DC side, diode D in parallel between two end lines of DC side again, subsequently at the anode series reactor L1 of DC side, and capacitor C1 in parallel between two end lines of DC side again; Second power inverter 2 adopts the first power switch unit S1 in each isolated level, the second power switch unit S2, the 3rd power switch unit S3, the 4th power switch unit S4 forms the bridge type topology structure, the first power switch unit S1, the last capacitor of series connection connects high frequency transformer 3 former limit anodes after the complementary conducting of the second power switch unit S2, the 3rd power switch unit S3, connect high frequency transformer 3 former limit negative terminals after the complementary conducting of the 4th power switch unit S4, the 3rd power inverter 4 is by the 5th power diode D5, the 6th power diode D6, the 7th power diode D7, the bridge circuit that the 8th power diode D8 forms, the 5th power diode D5, connect the secondary anode of high frequency transformer 3 after the complementary conducting of the 6th power diode D6, the 7th power diode D7, connect the secondary negative terminal of high frequency transformer 3 after the complementary conducting of the 8th power diode D8, the DC side output is connected in parallel on the same dc energy storage capacitor C; The 4th power inverter 5 adopts the 5th power switch unit S5 in each phase output stage, the 6th power switch unit S6, the 7th power switch unit S7, the 8th power switch unit S8 forms the bridge type topology structure, the 5th power switch unit S5, positive termination the 3rd power inverter 4 output plus terminals of the 7th power switch unit S7, the 6th power switch unit S6, the negative terminal of the 8th power switch unit S8 connects the 3rd power inverter 4 output negative terminals, the 5th power switch unit S5, connect the input of filter 6 after the complementary conducting of the 6th power switch unit S6, the 7th power switch unit S7, connect the input of filter 6 after the complementary conducting of the 8th power switch unit S8, described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT.
In power distribution network was used, the prime power unit of a kind of electric power electric transformer based on simple and easy PFC of the present invention was based on the AC-DC-AC-DC-AC type; The AC side of an input stage piezo-resistance R in parallel, shield, input stage is converted into direct current signal with the industrial frequency AC signal by uncontrollable rectification of diode and buck reduction voltage circuit, can realize power factor controlling, and can reduce the voltage stress of switching tube device by the buck reduction voltage circuit, be converted into high-frequency square-wave signal by second power inverter 2 in the isolation level then, connect the former limit of high-frequency isolation transformer 3 behind the last electric capacity of output series connection of second power inverter 2, and can play the resonant type soft-switch effect, reduce switching loss, the secondary of high-frequency isolation transformer 3 is converted into direct current signal by the uncontrollable rectification of diode, is reduced into the industrial frequency AC signal by the 4th power inverter 5 again; Control the work of power electronic equipment by suitable control strategy, thereby be the electric energy of another kind of frequency, voltage, waveform the transformation of electrical energy of a kind of frequency, voltage, waveform.
As shown in Figure 3, a kind of electric power electric transformer of the present invention based on simple and easy PFC, its outlet side the 4th power inverter can also constitute C by the tri-level inversion circuit that two dc capacitors, four clamping diodes and eight power switchs are formed
D1And C
D2Be input dividing potential drop electric capacity, Q
11, Q
14And Q
21, Q
24Be main switch, Q
12, Q
13And Q
22, Q
23It is auxiliary switch, output voltage can be by switching tube and diode pincers at mid-point voltage, so can obtain three level, compare with two-level inverter, the voltage harmonic content of its output can reduce significantly, and the voltage stress of every switching tube is reduced to input voltage half, is applicable to the occasion of high input voltage.
A kind of electric power electric transformer of the present invention based on simple and easy PFC, its single-phase input stage adopts the input stage power inverter by the prime power unit to be connected in series, be convenient to flexible Application on the power distribution network circuit of each electric pressure, need not to utilize and transformer coupledly just can directly import high pressure; The output-stage power converter is made of the single-phase bridge voltage source inverter; For the voltage stress that reduces switching tube, the quality that improves output waveform, the output-stage power converter can also adopt three level structures.
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 (6)
1. electric power electric transformer based on simple and easy PFC, 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; The input of the power inverter group of each single-phase input stage and the power inverter group of output stage is connected by star-like respectively; The power inverter group of each single-phase input stage comprises first power inverter (1), first power inverter (1) comprises diode-bridge circuit and buck circuit, first power inverter (1) AC side piezo-resistance in parallel, DC side connects corresponding dc energy storage electric capacity; Isolation level comprises the second rate converter (2) as high frequency DC/AC link, high frequency transformer (3) and as the 3rd power inverter (4) of high-frequency AC/DC link; The power inverter group of output stage comprises the 4th power inverter (5), and it adopts the voltage-source type bridge inverter main circuit; Connect the input of second power inverter (2) behind the output parallel connection direct storage capacitor of first power inverter (1), connect the former limit of high frequency transformer (3) after the output series capacitance of second power inverter (2), the secondary of high frequency transformer (3) connects the input of the 3rd power inverter (4), connect the input of the 4th power inverter (5) behind the output of the 3rd power inverter (4) and the last dc energy storage electric capacity, the corresponding filter (6) that connects of the output of the 4th power inverter (5).
2. the electric power electric transformer based on simple and easy PFC according to claim 1, it is characterized in that: the diode-bridge circuit of described input stage comprises first power diode (D1), second power diode (D2), the 3rd power diode (D3), the 4th power diode (D4), described buck circuit comprises power switch pipe (S), power diode (D), reactor (L1) and capacitor (C1), first power diode (D1), connection mid point after second power diode (D2) series connection connects and exchanges the input side negative terminal, the 3rd power diode (D3), connection mid point after the 4th power diode (D4) series connection connects and exchanges the input side anode, exchange input side piezo-resistance (R) in parallel, thyristor in parallel (T) between two end lines of diode rectifier bridge output DC side, the anode series connection power switch pipe (S) of DC side, parallel diode (D) between two end lines of DC side again, subsequently at the anode series reactor (L1) of DC side, and shunt capacitor (C1) between two end lines of DC side again.
3. the electric power electric transformer based on simple and easy PFC according to claim 1, it is characterized in that: described second power inverter (2) is by first power switch unit (S1), second power switch unit (S2), the 3rd power switch unit (S3), the bridge type topology structure that the 4th power switch unit (S4) is formed, first power switch unit (S1), series capacitor (C2) connects the former limit of high frequency transformer (3) anode after the complementary conducting of second power switch unit (S2), the 3rd power switch unit (S3), connect the former limit of high frequency transformer (3) negative terminal after the complementary conducting of the 4th power switch unit (S4), described the 3rd power inverter (4) is by the 5th power diode (D5), the 6th power diode (D6), the 7th power diode (D7), the 8th power diode (D8) is formed bridge circuit, the 5th power diode (D5), connection mid point after the 6th power diode (D6) series connection connects the secondary anode of high frequency transformer (3), the 7th power diode (D7), connection mid point after the 8th power diode (D8) series connection connects the secondary negative terminal of high frequency transformer (3), and the DC side output is connected in parallel on the same dc energy storage electric capacity (C).
4. the electric power electric transformer based on simple and easy PFC according to claim 1, it is characterized in that: described the 4th power inverter (5) is by the 5th power switch unit (S5), the 6th power switch unit (S6), the 7th power switch unit (S7), the 8th power switch unit (S8) is formed the bridge type topology structure, the 5th power switch unit (S5), positive termination the 3rd power inverter (4) output plus terminal of the 7th power switch unit (S7), the 6th power switch unit (S6), the negative terminal of the 8th power switch unit (S8) connects the 3rd power inverter (4) output negative terminal, the 5th power switch unit (S5), connect the input of filter (6) after the complementary conducting of the 6th power switch unit (S6), the 7th power switch unit (S7), connect the input of filter (6) after the complementary conducting of the 8th power switch unit (S8).
5. according to claim 3 or 4 described electric power electric transformers based on simple and easy PFC, it is characterized in that: described each power switch unit is composed in parallel with a diode that oppositely is connected by two IGBT.
6. according to claim 1 or 4 described electric power electric transformers based on simple and easy PFC, it is characterized in that: described filter (6) is made up of output inductor (La1) and output filter capacitor (Ca1).
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