CN104253548A - Three-level power electronic traction transformer of non-power frequency transformer - Google Patents
Three-level power electronic traction transformer of non-power frequency transformer Download PDFInfo
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- CN104253548A CN104253548A CN201410328017.XA CN201410328017A CN104253548A CN 104253548 A CN104253548 A CN 104253548A CN 201410328017 A CN201410328017 A CN 201410328017A CN 104253548 A CN104253548 A CN 104253548A
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Abstract
The invention discloses a three-level power electronic traction transformer of a non-power frequency transformer. An input reactor L is connected with a traction network (V) to realize the vehicle-mounted power transformation, n identical function modules (M1-Mn) which are connected by input serial connection and output parallel connection are adopted, and each module is a power electronic device of an alternating current-direct current converter with a single-phase structure. The transformer is characterized in that a power electronic device consists of a single-phase diode inserting type three-level rectifying circuit and a half-bridge three-level bidirectional direct current-direct current converter. The transformer has the advantages that the structure is concise, and the requirement of the resonance is not necessary to meet ; the size of the system is greatly reduced, the working efficiency and electric energy quality are improved, the system is controllable, and the easiness in adverse effects, such as resonance, is avoided; the three-level output is realized, the current returning energy in the single switch cycle is reduced, and the energy transmission efficiency is greatly improved.
Description
Technical field
The present invention relates to a kind of power electronics traction transformer, particularly relate to the locomotive vehicle-mounted power electronics traction transformer of no industrial frequency transformer in Traction networks.
Background technology
Figure 1 shows that traditional vehicle-mounted changer system transformer model circuit structure.Figure comprises ac tracting network, three winding Industrial Frequency Transformer, Pulse rectifier, traction invertor.Traction networks is connected with winding top, three winding Industrial Frequency Transformer former limit; Secondary two windings respectively with two pwm pulse rectifiers, rectifier outlet side is in parallel, and is connected with traction invertor.Tradition traction transformer haulage chain is very heavy, efficiency is relatively low, and the quality of power supply is not high, needs extra harmonic compensation device and reactive power compensator.
For effectively solving the problem, propose a kind of two level power electronic transformers of no industrial frequency transformer, as shown in Figure 2.Wherein, the equal modules (M of Traction networks (V), the connection of input reactance device L and n employing input series and output parallel is comprised
1-M
n).Described module is made up of the power electronic equipment of the A.C.-D.C. converter of phase structure.This power electronic equipment is primarily of single-phase H bridge rectification circuit, the two-way straight convertor composition of bilateral H bridge two level.Described electric power electric transformer is simple for structure, does not need to meet condition of resonance.But due to the withstand voltage restriction of switching tube IGBT, make to meet Traction networks when normally running, each module voltage lower grade, cause that cascade module is too many, system reliability reduces, give on controlling and realizing and bring a difficult problem.
Summary of the invention
The object of the invention is the three level power electronics traction transformer relating to a kind of no industrial frequency transformer, make it to overcome the as above not enough of prior art, have simple for structure, do not need to meet condition of resonance; The volume of mitigation system greatly, operating efficiency and the high advantage of the quality of power supply.
Realizing our concrete scheme of goal of the invention is:
A three level power electronics traction transformer for no industrial frequency transformer, realizes vehicle power transformation after being connected by input reactance device L with Traction networks (V), the identical functional module (M adopting input series and output parallel to connect by n
1-M
n), described module is the power electronic equipment of the A.C.-D.C. converter of phase structure, and described power electronic equipment forms primarily of single-phase diode clamped three level rectification circuit, the two-way straight convertor of half-bridge three-level, wherein:
A, left side Traction networks (V) are connected with one end of input reactance device (L); The other end of input reactance device (L) is connected to module 1 (M
1) in the left brachium pontis tandem tap pipe (S of rectification circuit
1, S
2, S
3, S
4) mid point a
1; Module 1 (M
1) in the right brachium pontis tandem tap pipe (S of rectification circuit
5, S
6, S
7, S
8) mid point c
1adjacent block (M with it
2) in rectification circuit left brachium pontis on mid point a
2point is connected, and by that analogy, the input of n module is cascaded structure, last module (M
n) in rectification circuit right brachium pontis mid point c
nthe negative terminal (R) of Traction networks is connected;
Clamping diode (the D of left and right brachium pontis in rectification circuit in b, each module
1, D
2with D
3, D
4) mid point b
1, d
1and DC side two series capacitance (C
1, C
2) mid point e
1be connected.The catching diode mid point g of the left half-bridge of the two-way straight convertor of half-bridge three-level
1be connected with medium/high frequency transformer (MFT) former limit winding ends and be connected to e
1point; And its left half-bridge tandem tap pipe (S
9, S
10, S
11, S
12) mid point f
1through inductance L
rbe connected to winding top, intermediate frequency transformer (MFT) former limit, its vice-side winding top and straight convertor right half-bridge tandem tap pipe (S
13, S
14, S
15, S
16) mid point h
1be connected, vice-side winding end is connected to right half-bridge catching diode (D
7, D
8) mid point i
1, and with DC bus capacitor (C
3, C
4) mid point j
1be connected.Straight convertor DC output end mouth k in each module
1, l
1, k
2, l
2k
n, l
nin parallel-connection structure.
When reality uses, each brachium pontis of every module all can realize three level and export, and due to paralleled power switches diode, and electric current can two-way flow, but does not affect output level; Be example with regard to the left brachium pontis of rectification circuit, work as S
1, S
2during conducting, a
1, e
1the voltage of point-to-point transmission is the half of intermediate dc busbar voltage; Work as S
2, S
3during conducting, a
1, e
1the voltage of point-to-point transmission is 0; Work as S
3, S
4during conducting, a
1, e
1the voltage of point-to-point transmission is the half of negative intermediate dc busbar voltage.
Three level electric power electric transformer of the present invention adopts the structure of n equal modules input series and output parallel.Because each wired in parallel is at secondary side, each module only has flat-out sub-fraction, and modular design provides some advantages for the enforcement of transducer and maintenance.Below different structure in each module is described:
1, the clamped three level rectification circuit of single-phase diode
The clamped three level rectification circuit of single-phase diode is the interface of power electronics traction transformer and Traction networks, and it is connected with Traction networks by connecting reactance L.Its basic function is the control by switch tube, carries out rectification, realize output dc voltage adjustable to Traction networks alternating voltage.As shown in Figure 3, each brachium pontis has 4 switching tubes to its basic structure, and compared to H bridge construction, each brachium pontis has more two switching tubes, and therefore the voltage withstand class of circuit is doubled; Compare the cascade of H bridge, because the voltage withstand class of diode clamping circuit is doubled, therefore cascade module number only has the half of H bridge, and namely the capacity of tri-level single module is doubled.
2, the two-way straight convertor of half-bridge three-level
In the two-way straight convertor of half-bridge three-level, transformer primary side brachium pontis realizes invert function, direct voltage is reverse into the alternating voltage supply transformer of three level.Circuit Fault on Secondary Transformer brachium pontis realizes rectification function, and the alternating current that transformer exports is become direct current.
The control method traditional to the two-way straight convertor of half-bridge three-level is phase shifting control, its operation principle waveform as shown in Figure 4, T in Fig. 4
hfrepresent half control cycle, Q
9~ Q
16represent Fig. 3 breaker in middle pipe S
9~ S
16drive singal, V
aBindication transformer primary side port voltage, V
cDindication transformer secondary port voltage, V
1represent the two-way straight convertor input voltage of half-bridge three-level and intermediate dc busbar voltage, V
2represent the two-way straight convertor output voltage of half-bridge three-level, I
lrepresent inductance (L
r) electric current.Under tradition phase-shifting controls, Q
9, Q
10identical, Q
11, Q
12identical, Q
9(Q
10) and Q
11(Q
12) complementary, Q
13, Q
14identical, Q
15, Q
16identical, Q
13(Q
14) and Q
15(Q
16) complementary.There is phase shifting angle Φ in the drive singal of the drive singal switching tube corresponding to secondary side brachium pontis of each switching tube of transformer primary side brachium pontis, just can be controlled the size and Orientation of flow of power by the size controlling phase shifting angle Φ.Tradition phase-shifting control method simply, easily realizes.But because the electric current of inductance lags behind voltage, there is the stage that inductive current is contrary with original edge voltage direction, as the t in Fig. 4
0~ t
0' and t
2~ t
2' stage, during this period of time, primary side power output is negative, and power is back in primary side power supply, defines this power for backflow power.Easy discovery, in through-put power one timing, backflow power is larger, and in order to compensate this part power, the power of forward transmission is also larger, and this will increase converter current stress, thus the loss of increasing power device, reduce the efficiency of converter.
In order to solve power reflux problem, have employed the control method that a kind of pulse width control combines with phase shifting control, its operation principle waveform as shown in Figure 5.Pulse width control controls the ON time of each switching tube in one-period, the uppermost switching tube of each brachium pontis and a nethermost switching tube ON time is allowed to be less than half period, in the middle of each brachium pontis, two switching tube ON time are greater than half period, thus the voltage waveform of transformer two-port is the square wave of three level.In Fig. 5, D
2the time span corresponding for phase shifting angle Φ and T
hfratio, also can be expressed as D
2=Φ/π; τ represents the time of two switching tubes or two switching tube conductings simultaneously below above each brachium pontis in half period, τ=(1-D
1) T
hf.Wherein, D
1for V
aBor V
cDtime of zero level and half period T in half period
hfratio.The implication of other symbols and identical in Fig. 4 in Fig. 5.Can be seen by Fig. 5, in transformer primary side port voltage, increase by one section of zero level can reduce backflow power.The control method that pulse width control and phase shifting control combine compared with phase shifting control, many controlled quentity controlled variable D when regulation output power
1, to onesize power output, can by different D
1, D
2combination realizes, thus the soft-switching range that can expand converter reduces the switching loss of power device, improves power transmission efficiency.
Compared with prior art, beneficial effect of the present invention is:
1. due to the use of IGBT, impel transformer frequencies to increase with the order of magnitude, far away higher than traditional Industrial Frequency Transformer frequency; Correspondingly in straight convertor, adopt medium/high frequency transformer (MFT), relative to Industrial Frequency Transformer system, can the volume of mitigation system greatly, increase work efficiency and the quality of power supply, and system controlled, not easily cause the adverse consequencess such as resonance.
2. owing to adopting three-level structure in individual module of the present invention, improve single module electric pressure relative to the power electronics traction transformer of existing two level block, under identical capacity conditions, medium-frequency isolation transformer quantity can be reduced by half;
3. monolateral of DC/DC converter uses a brachium pontis, realizes three level and exports, reduce in the Single switch cycle size of the energy that refluxes, effectively can improve energy transmission efficiency relative to the straight convertor of the H bridge construction of two level;
4. DC/DC converter three level exports the working range expanding device zero current passing, effectively can reduce switching loss.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is traditional traction transformer structural system figure;
Fig. 2 is two level power electric traction transformer circuit schematic diagrams of existing no industrial frequency transformer;
Fig. 3 is a kind of three level power electronics traction transformer circuit theory diagrams of no industrial frequency transformer;
Fig. 4 is that the tradition phase-shifting of straight convertor controls operation principle waveform;
Fig. 5 is the operation principle waveform that the pulse width control of straight convertor combines with phase shifting control
Embodiment
Fig. 3 illustrates, a kind of embodiment of the present invention is: a kind of three level power electronics traction transformer of no industrial frequency transformer, vehicle power transformation is realized, the identical functional module (M adopting input series and output parallel to connect by n after being connected with Traction networks (V) by input reactance device L
1-M
n), described module is the power electronic equipment of the A.C.-D.C. converter of phase structure, it is characterized in that, described power electronic equipment forms primarily of single-phase diode clamped three level rectification circuit, the two-way straight convertor of half-bridge three-level, wherein:
A, left side Traction networks (V) are connected with one end of input reactance device (L); The other end of input reactance device (L) is connected to module 1 (M
1) in the left brachium pontis tandem tap pipe (S of rectification circuit
1, S
2, S
3, S
4) mid point a
1; Module 1 (M
1) in the right brachium pontis tandem tap pipe (S of rectification circuit
5, S
6, S
7, S
8) mid point c
1adjacent block (M with it
2) in rectification circuit left brachium pontis on mid point a
2point is connected, and by that analogy, the input of n module is cascaded structure, last module (M
n) in rectification circuit right brachium pontis mid point c
nthe negative terminal (R) of Traction networks is connected;
Clamping diode (the D of left and right brachium pontis in rectification circuit in b, each module
1, D
2with D
3, D
4) mid point b
1, d
1and DC side two series capacitance (C
1, C
2) mid point e
1be connected.The catching diode mid point g of the left half-bridge of the two-way straight convertor of half-bridge three-level
1be connected with medium/high frequency transformer (MFT) former limit winding ends and be connected to e
1point; And its left half-bridge tandem tap pipe (S
9, S
10, S
11, S
12) mid point f
1through inductance L
rbe connected to winding top, intermediate frequency transformer (MFT) former limit, its vice-side winding top and straight convertor right half-bridge tandem tap pipe (S
13, S
14, S
15, S
16) mid point h
1be connected, vice-side winding end is connected to right half-bridge catching diode (D
7, D
8) mid point i
1, and with DC bus capacitor (C
3, C
4) mid point j
1be connected.Straight convertor DC output end mouth k in each module
1, l
1, k
2, l
2k
n, l
nin parallel-connection structure.
Claims (1)
1. a three level power electronics traction transformer for no industrial frequency transformer, realizes vehicle power transformation after being connected by input reactance device L with Traction networks (V), the identical functional module (M adopting input series and output parallel to connect by n
1-M
n), described module is the power electronic equipment of the A.C.-D.C. converter of phase structure, it is characterized in that, described power electronic equipment forms primarily of single-phase diode clamped three level rectification circuit, the two-way straight convertor of half-bridge three-level, wherein:
A, left side Traction networks (V) are connected with one end of input reactance device (L); The other end of input reactance device (L) is connected to module 1 (M
1) in the left brachium pontis tandem tap pipe (S of rectification circuit
1, S
2, S
3, S
4) mid point a
1; Module 1 (M
1) in the right brachium pontis tandem tap pipe (S of rectification circuit
5, S
6, S
7, S
8) mid point c
1adjacent block (M with it
2) in rectification circuit left brachium pontis on mid point a
2point is connected, and by that analogy, the input of n module is cascaded structure, last module (M
n) in rectification circuit right brachium pontis mid point c
nthe negative terminal (R) of Traction networks is connected;
Clamping diode (the D of left and right brachium pontis in rectification circuit in b, each module
1, D
2with D
3, D
4) mid point b
1, d
1and DC side two series capacitance (C
1, C
2) mid point e
1be connected; The catching diode mid point g of the left half-bridge of the two-way straight convertor of half-bridge three-level
1be connected with medium/high frequency transformer (MFT) former limit winding ends and be connected to e
1point; And its left half-bridge tandem tap pipe (S
9, S
10, S
11, S
12) mid point f
1through inductance L
rbe connected to winding top, intermediate frequency transformer (MFT) former limit, its vice-side winding top and straight convertor right half-bridge tandem tap pipe (S
13, S
14, S
15, S
16) mid point h
1be connected, vice-side winding end is connected to right half-bridge catching diode (D
7, D
8) mid point i
1, and with DC bus capacitor (C
3, C
4) mid point j
1be connected; Straight convertor DC output end mouth k in each module
1, l
1, k
2, l
2k
n, l
nin parallel-connection structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410328017.XA CN104253548A (en) | 2014-07-10 | 2014-07-10 | Three-level power electronic traction transformer of non-power frequency transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410328017.XA CN104253548A (en) | 2014-07-10 | 2014-07-10 | Three-level power electronic traction transformer of non-power frequency transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104253548A true CN104253548A (en) | 2014-12-31 |
Family
ID=52188170
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410328017.XA Pending CN104253548A (en) | 2014-07-10 | 2014-07-10 | Three-level power electronic traction transformer of non-power frequency transformer |
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| CN104779814A (en) * | 2015-04-17 | 2015-07-15 | 西南交通大学 | Topological structure of vehicle-mounted power frequency-free electric and electronic transformer |
| CN105720840A (en) * | 2015-06-24 | 2016-06-29 | 中兴通讯股份有限公司 | Power conversion device and configuring method thereof |
| WO2016134527A1 (en) * | 2015-02-27 | 2016-09-01 | The University Of Hong Kong | Power converter and power conversion method |
| CN107070257A (en) * | 2017-04-27 | 2017-08-18 | 西南交通大学 | Converter device and converter system |
| CN109256764A (en) * | 2018-11-23 | 2019-01-22 | 西南交通大学 | A kind of vehicle-mounted grid-side converter suitable for middle pressure direct-current traction power supply |
| CN109802575A (en) * | 2019-04-01 | 2019-05-24 | 西南交通大学 | A kind of two-way full-bridge three-level DC-DC converter optimal control method |
| CN110789360A (en) * | 2019-10-31 | 2020-02-14 | 湖南大学 | Multi-system traction transmission system and method based on modular multilevel converter |
| CN112217406A (en) * | 2019-07-11 | 2021-01-12 | 台达电子工业股份有限公司 | Power supply device applied to solid-state transformer framework and three-phase power supply system |
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| CN115361000A (en) * | 2022-10-18 | 2022-11-18 | 北京国械堂科技发展有限责任公司 | Device for applying electric field to human body and electric field therapeutic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016134527A1 (en) * | 2015-02-27 | 2016-09-01 | The University Of Hong Kong | Power converter and power conversion method |
| US11146170B2 (en) | 2015-02-27 | 2021-10-12 | The University Of Hong Kong | Plural stages switching capacitor converter |
| CN104779814A (en) * | 2015-04-17 | 2015-07-15 | 西南交通大学 | Topological structure of vehicle-mounted power frequency-free electric and electronic transformer |
| CN105720840A (en) * | 2015-06-24 | 2016-06-29 | 中兴通讯股份有限公司 | Power conversion device and configuring method thereof |
| CN107070257A (en) * | 2017-04-27 | 2017-08-18 | 西南交通大学 | Converter device and converter system |
| CN109256764A (en) * | 2018-11-23 | 2019-01-22 | 西南交通大学 | A kind of vehicle-mounted grid-side converter suitable for middle pressure direct-current traction power supply |
| CN109802575A (en) * | 2019-04-01 | 2019-05-24 | 西南交通大学 | A kind of two-way full-bridge three-level DC-DC converter optimal control method |
| CN112217406A (en) * | 2019-07-11 | 2021-01-12 | 台达电子工业股份有限公司 | Power supply device applied to solid-state transformer framework and three-phase power supply system |
| CN110789360A (en) * | 2019-10-31 | 2020-02-14 | 湖南大学 | Multi-system traction transmission system and method based on modular multilevel converter |
| CN110789360B (en) * | 2019-10-31 | 2021-06-18 | 湖南大学 | Multi-system traction transmission system and method based on modular multilevel converter |
| CN113114033A (en) * | 2021-05-18 | 2021-07-13 | 西南交通大学 | Direct-current-side secondary ripple suppression device for traction transmission system and control method |
| CN115361000A (en) * | 2022-10-18 | 2022-11-18 | 北京国械堂科技发展有限责任公司 | Device for applying electric field to human body and electric field therapeutic apparatus |
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Application publication date: 20141231 |