CN104578833A - Implementation method of thyristor-based high-quality active front-end converter - Google Patents

Implementation method of thyristor-based high-quality active front-end converter Download PDF

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Publication number
CN104578833A
CN104578833A CN201310479789.9A CN201310479789A CN104578833A CN 104578833 A CN104578833 A CN 104578833A CN 201310479789 A CN201310479789 A CN 201310479789A CN 104578833 A CN104578833 A CN 104578833A
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current
phase
unsteady flow
thyristor
flow bridge
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CN104578833B (en
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高毅夫
陈琳琳
刘昆
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Beijing Kaide Zhongtian Technology Development Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/1555—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with control circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses an implementation method of a thyristor-based high-quality active front-end converter, belongs to the alternating-current converter control technology, and aims to intensively study the rectification system conversion mechanism of a frequency converter, a topological structure and a control technology and develop a thyristor-based high-quality active front-end converter with low harmonic wave, high power factor and electric power feedback capacity. The implementation method of the thyristor-based high-quality active front-end converter is characterized in that an active front-end conversion system of the converter comprises a phase-shifting transformer, a 12-pulse bridge inverter and a multi-level direct current control and synthesis unit, wherein the 12-pulse bridge inverter is formed by two completely identical 6-pulse thyristor bridge inverters. An asymmetrical current control strategy is adopted, two three-phase bridge inverters are controlled according to a given conversion rule, so that current on line side of the phase-shifting transformer is sine-wave current, the functions of low harmonic wave, free adjustability of a power factor, electric power feedback brake, adjustable large range of direct-current voltage and current are realized, and the method is applicable to green and energy-saving type active front-end converters with various voltage classes and various power ranges.

Description

Based on the high-quality Active Front End current transformer implementation method of thyristor
Technical field
The invention belongs to AC converter control technology.
Background technology
Frequency converter comes out over more than 30 year, and its application obtains and develops rapidly, is widely used in all trades and professions at present, instead of Direct Current Governor System in some field.The extensive use of frequency converter has benefited from manufacture technique of power electronic device, Semiconductor Converting Technology, control technology, Microcomputer Technology, the developing rapidly of large scale integrated circuit technology, equally, the extensive use of frequency converter also effectively facilitates the development of correlation technique.Under this technology is mutually promoted, frequency converter constantly miniaturized, power is large, function is strong, be developed in convenient operation etc. and perfect.
On the other hand, frequency converter is again harmonic pollution source, and along with the extensive use of frequency converter, the problem of harmonic pollution also becomes day by day serious, and the problem solving harmonic pollution just becomes the important topic that we face.
The harmonic pollution solving converter plant can obtain from two approach, and one is additional filterings device and reactive power compensator, and another approach is the converter plant of research and development low harmony wave and High Power Factor.Obviously the former passive remedies mode, and the latter is positive active method.Research and develop the imbody that high-quality Active Front End current transformer is exactly a rear approach.
At present, the method of high-grade low voltage frequency converter harmonic inhabitation, raising power factor is the method adopting Active Front End current transformer to be attached with source filter, Active Front End current transformer carries out High Power Factor and controls and electric energy feedback control, active filter carries out harmonic, by Harmonics elimination or suppress in allowed limits.High-grade medium voltage frequency converter harmonic inhabitation, to improve the method for power factor be the method adopting multiple active rectification, namely by multiple phase shifting transformer and multi-pulse rectification and the elimination of pulse-width modulation (PWM) technology or harmonic inhabitation, raising power factor, carry out electric energy feedback control.And low-grade pressure common and medium voltage frequency converter all ubiquity harmonic wave, power factor and electric energy feedback problems.
Make a general survey of current frequency converter commutation system, high-grade converter technology can realize power factor close to " 1 ", harmonic content lower than national standard requirement numerical value and can electric energy feedback control, but still there is system price costliness, system realizes the weakness such as complicated, these weakness seriously constrain the practical application of high-end frequency converter, the frequency converter overwhelming majority applied in the market is low-grade common frequency converter, this just makes frequency converter extensive use and the contradiction administering harmonic pollution, the same with the environmental pollution of water with natural air, the harmonic pollution administering and solve power electronic equipment is also extremely urgent problem.A kind of there is succinct topological structure if can find, simple, reliable, cheap system carrys out alternative current various frequency converter commutation systems, then can receive the resultant effect administering harmonic pollution and energy efficiency, greatly will promote the development of converter technology.
There is due to thyristor the advantages such as high, the specified On current of withstand voltage is large, efficiency is high, good reliability, just obtained a wide range of applications since it comes out always, even if there is the characteristic of half control, thus, outside some field is replaced by full-controlled switching elements such as GTO, IGBT, IGCT, it still occupies critical positions in DC speed regulation field and high-power applications field.Practical application shows, thyristor is still one of attractive power electronic device, carries out more deep research still have important practical significance to it.
About the research of the high-quality Active Front End current transformer based on thyristor yet there are no the document published.
Summary of the invention
The object of the invention is commutation system conversion mechanism, topological structure and the control technology of furtheing investigate frequency converter, research and develop a kind of low harmony wave, High Power Factor, can electric energy feedback, high-quality Active Front End current transformer based on thyristor.
Research object of the present invention is thyristor 12 Pulses Rectifier, and this is the typical structure of rectifier, and its converter transformer winding construction of the rectifier of this spline structure is simple, and outlet is easy, and winding utilization is high, is applicable to various power applications.
The main points that the present invention is based on the high-quality Active Front End current transformer implementation method of thyristor achieve breakthrough progress in harmonics restraint, thyristor application, system synthesis efficiency and four quadrant running.
The feature that the present invention is based on the high-quality Active Front End current transformer implementation method of thyristor is that the Active Front End converter system of frequency converter is by a primary side Y winding [2] and Y and the △ secondary side winding [3] of two mutual deviations 30 degree and the phase shifting transformer of [4], the 12 pulse wave unsteady flow bridges and a set of many level DCs Current Control be made up of two identical thyristor 6 pulse wave unsteady flows bridge [5] and [6] and synthesis unit [7] form, adopt the control strategy of asymmetrical current, by many level DCs Current Control and synthesis unit [7], implement to control the current waveform of two three-phase unsteady flow bridges by the particular transform rule of (1) formula and (2) formula, [34] be the Y three-phase unsteady flow bridge output current wave of many level synthesis of the incremental steps shape triangular current waveforms such as employing, [35] be the current waveform that △ three-phase unsteady flow bridge exports, [36] be that Y three-phase unsteady flow bridge exports and △ three-phase unsteady flow bridge exports the DC side current waveform synthesized, [32] be Circuit Fault on Secondary Transformer Y winding current waveform, [33] be Circuit Fault on Secondary Transformer △ winding current waveform, [31] be the resultant current waveform that transformer primary side obtains, for low harmony wave sine waveform, by to Y three-phase unsteady flow bridge and the direct control of △ three-phase unsteady flow bridge current amplitude and the phase control of reciprocity incremental steps shape triangular current, achieve power factor adjustable arbitrarily, electric energy feedback is braked, the function that direct voltage and electric current freely regulate and control at 0 ~ nominal value range.
I BY ( ωt ) = I dc { 1 2 + Σ k = 1 ∞ 7 + 4 3 36 ( 2 k - 1 ) 2 - 1 cos [ 6 ( 2 k - 1 ) ωt ] + Σ k = 1 ∞ 1 144 k 2 - 1 cos ( 12 kωt ) - - - ( 1 )
I BΔ ( ωt ) = I dc { 1 2 - Σ k = 1 ∞ 7 + 4 3 36 ( 2 k - 1 ) 2 - 1 cos [ 6 ( 2 k - 1 ) ωt ] + Σ k = 1 ∞ 1 144 k 2 - 1 cos ( 12 kωt ) - - - ( 2 )
In formula:
I bY: Y bridge direct current
I b Δ: Δ bridge direct current
I dc: DC side inverter load current
k=1，2，…
Accompanying drawing explanation
Accompanying drawing 1 is the high-quality Active Front End current transformer implementation method topology diagram based on thyristor, and in Fig. 1,1 is three-phase alternating current incoming power, is generally the power supply of standard voltage grade, in particular cases also can the power supply of criteria of right and wrong voltage; 2 is phase shifting transformer first side winding, Y connection; 3 is phase shifting transformer secondary side Y shape windings; 4 is phase shifting transformer secondary side △ shape windings, and differ 30 ° with Y shape winding, line voltage is equal; 5 is Y winding Thyristor Three-phase unsteady flow bridges; 6 is △ winding Thyristor Three-phase unsteady flow bridges; 7 is many level DCs Current Control and synthesis unit, and effect is carried out controlling and synthesizing in the mode of many level by the direct current of Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge; 8 is inversion unit.
Accompanying drawing 2 is the high-quality Active Front End current transformer implementation method oscillograms under ideal transformation based on thyristor, and in Fig. 2,21 is three-phase alternating current incoming power side A phase I acurrent waveform, B phase I bcurrent waveform and C phase I ccurrent waveform and A phase I acurrent waveform is similar, and difference is only differ 120 ° and 240 ° with A phase respectively; 22 is 12 pulse wave convertor transformer secondary side Y shape winding A phase Ia ycurrent waveform, B phase I bYcurrent waveform and C phase I cYcurrent waveform and A phase Ia ycurrent waveform is similar, and difference is only differ 120 ° and 240 ° with A phase respectively; 23 is 12 pulse wave convertor transformer secondary side △ shape winding A phase Ia Δcurrent waveform, B phase I b Δcurrent waveform and C phase I c △current waveform and A phase Ia Δcurrent waveform is similar, and difference is only differ 120 ° and 240 ° with A phase respectively; 24 is Y winding three-phase unsteady flow bridge output current IBY waveforms, is triangular current; 25 is △ winding three-phase unsteady flow bridge output current I b Δwaveform is also triangular current, but differs 30 ° with Y three-phase unsteady flow bridge in phase place; 26 is that Y three-phase unsteady flow bridge exports and △ three-phase unsteady flow bridge exports the DC side inverter load current I synthesized dCwaveform.
Accompanying drawing 3 is the high-quality Active Front End current transformer implementation method oscillograms when incremental steps shape triangular waves such as employings based on thyristor, and in Fig. 3,31 is three-phase alternating current incoming power side A phase I acurrent waveform, B phase I bcurrent waveform and C phase I ccurrent waveform and A phase I acurrent waveform is similar, and difference is only differ 120 ° and 240 ° with A phase respectively; 32 is 12 pulse wave convertor transformer secondary side Y shape winding A phase Ia ycurrent waveform, B phase I bYcurrent waveform and C phase I cYcurrent waveform and A phase Ia ycurrent waveform is similar, and difference is only differ 120 ° and 240 ° with A phase respectively; 33 is 12 pulse wave convertor transformer secondary side △ shape winding A phase Ia △current waveform, B phase I b Δcurrent waveform and C phase I c △current waveform and A phase Ia △current waveform is similar, and difference is only differ 120 ° and 240 ° with A phase respectively; 34 is Y winding three-phase unsteady flow bridge output current I bYwaveform; 35 is △ winding three-phase unsteady flow bridge output current I b △waveform; 36 is DC side inverter load current I dCwaveform.
Embodiment
For realize low harmony wave, High Power Factor, can the function of electric energy feedback, high-quality Active Front End current transformer implementation method based on thyristor takes the topological structure of phase shifting transformer, system has the phase shifting transformer of Y and the △ secondary side winding of first side winding and two mutual deviations 30 degree, 12 pulse wave thyristor current transformers and a set of many level DCs Current Control by one and allocation units form, and control strategy takes the method for the asymmetrical control three-phase unsteady flow bridge electric current based on (1) formula and (2) formula.
Analyze harmonic wave situation, 12 traditional pulse wave rectifiers DC quantity are averagely allocated to two three-phase unsteady flow bridges to convert, when mean allocation DC quantity is to two three-phase unsteady flow bridges, the interchange of two three-phase unsteady flow bridges of 12 pulse wave current transformers exports containing 6k ± 1 (k=1,2,) subharmonic, wherein two three-phase unsteady flow bridge 6 (2k-1) ± 1 (k=1,2 ...) subharmonic equal and opposite in direction, phase place is contrary, 6 (2k) ± 1 (k=1,2 ...) subharmonic equal and opposite in direction, phase place is identical.Therefore, after the interchange of two three-phase unsteady flow bridges exports and synthesizes, 6 (2k-1) ± 1 (k=1,2 ...) subharmonic cancels each other, and two three-phase unsteady flow bridge 6 (2k) ± 1 (k=1,2,) subharmonic exchange with for current transformer export harmonic component, exchange export total harmonic distortion factor THD>8%, such conversion quality obviously can cause harmonic pollution to three-phase alternating-current supply.
How distribute DC quantity to two three-phase unsteady flow bridges, just can harmonic inhabitation, if realize alternating current source to obtain the unequal direct current that distributes of high-quality conversion of sine waveform to two three-phase unsteady flow bridges, but direct current is distributed to two three-phase unsteady flow bridges by the particular transform rule of (1) formula and (2) formula, make two three-phase unsteady flow bridges exchange output and do not comprise 6 (2k) ± 1 (k=1,2,) subharmonic, current transformer just can be made to exchange and to export as sinusoidal wave.
Direct current is distributed to two three-phase unsteady flow bridges by the rule of conversion of (1) formula and (2) formula, and I bY(ω t) and I b Δ(ω t) is synchronous with the ac output current of Y three-phase unsteady flow bridge, △ three-phase unsteady flow bridge, then the synthesis of two three-phase unsteady flow bridges exchanges and exports as sinusoidal current.[24] be the waveform distributing to Y winding three-phase unsteady flow bridge by (1) formula, [25] be the waveform distributing to △ winding three-phase unsteady flow bridge by (2) formula, [22] be Y winding three-phase unsteady flow bridge ac-side current waveform, [23] be △ winding three-phase unsteady flow bridge ac-side current waveform, [21] be the current waveform that Y winding three-phase unsteady flow bridge and △ winding three-phase unsteady flow bridge synthesize, i.e. network side current waveform, for the sine-wave current waveform not containing harmonic wave, this is waveform ideally.
Actually realize such electric current, be by the triangular current being applied to two three-phase unsteady flow bridges with etc. incremental steps shape triangular current be similar to, namely form many level constituted mode.Following principle many level DCs Current Control and synthesis unit [7] is adopted to realize etc. incremental steps shape triangular current waveform:
(1) direct current equalization is assigned to m branch road, each branch road is connected to two gate-controlled switches, these two switch complementary actions, forms complementary switch pair, be connected respectively to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge, m branch road can be formed m+1 level etc. incremental steps shape triangular wave.
(2) complementary switch pair is switched every 30 °/m, the electric current of inflow Y three-phase unsteady flow bridge is made to increase a branch road amount, also make the electric current of inflow △ three-phase unsteady flow bridge reduce by a branch road amount simultaneously, interval through m 30 °/m, after all branch currents all flow into Y three-phase unsteady flow bridge, the electric current of inflow Y three-phase unsteady flow bridge is made to reduce by a branch road amount every 30 °/m again, also make the electric current of inflow △ three-phase unsteady flow bridge increase a branch road amount simultaneously, until the electric current flowing into Y three-phase unsteady flow bridge reduces to zero, repeat above process, just can by direct current by etc. the rule of incremental steps shape triangular wave distribute to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge.
With etc. incremental steps shape triangular wave approximate after, [34] be the waveform distributing to Y winding three-phase unsteady flow bridge by (1) formula, [35] be the waveform distributing to △ winding three-phase unsteady flow bridge by (2) formula, [32] be Y winding three-phase unsteady flow bridge ac-side current waveform, [33] be △ winding three-phase unsteady flow bridge ac-side current waveform, [31] be the current waveform that Y winding three-phase unsteady flow bridge and △ winding three-phase unsteady flow bridge synthesize, i.e. network side current waveform, for the current waveform close to sine wave containing certain harmonic wave, this is the waveform obtained after adopting control method of the present invention.
The high-quality Active Front End current transformer implementation method based on thyristor of above-mentioned principle and direct current control and synthetic method is adopted to have following characteristic:
low harmony wave height conversion quality, phase shifting transformer mains side current harmonic content increases with m and reduces, and the relation of THD and the m of its electric current is shown in table 1.
The relation table of table 1.THD and m
m 2 3 4 5 6 7 8 9
THD 7.77％ 5.25％ 3.99％ 3.28％ 2.77％ 2.45％ 2.20％ 2.02％
According to table 1, when m >=6, the harmonic value of phase shifting transformer mains side is limited within 3%.
thyristor is control entirely, by etc. incremental steps shape triangular current be applied to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge, the electric current that result in switching device in Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge by setting etc. the change of incremental steps shape triangular current rule.When the switching device forming Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge is thyristor, to gate circuit transistor gate triggering signal when the incremental steps shape triangular currents such as applying start, thyristor is open-minded, be during zero waiting incremental steps shape triangular current, thyristor current flows be zero be forced to turn off, namely thyristor is opened and is controlled by gate pole, electric current for zero turn off control by etc. incremental steps shape triangular current provide, both combination makes thyristor achieve the effect of full control switch.The full control of thyristor makes Trigger Angle phase shift range become-180 ° ~ 180 °, the power factor that just can realize so easily in the past using full-controlled switch device to realize can advanced or delayed continuous adjustment, power factor be the control of " 1 ", the high-touch feature that controls of electric energy feedback.
high efficiency, thyristor turns off when electric current is zero, open-minded when voltage is zero, achieves Sofe Switch control mode, and without switching loss, its operating frequency is 50Hz, and switching frequency is low, and thus gross efficiency is high.
by to be applied to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge etc. the control of incremental steps shape triangular wave amplitude, achieve DC voltage electric current controlled on a large scale, DC side no longer needs large energy-storage travelling wave tube.
Compared with the existing technology, the large energy-storage travelling wave tube of AC and DC side is no longer needed with the New Active front end current transformer that the high-quality Active Front End current transformer implementation method based on thyristor builds, avoid resonance and the slow problem of system responses, effectively inhibit harmonic wave, there is low harmony wave, high efficiency, DC voltage and current is controlled on a large scale, power factor is " 1 ", can electric energy feedback, topological structure and the advantage such as control system is succinct, particularly achieve the full controlization of thyristor, the withstand voltage height of thyristor can be played, current capacity is large, device performance is stablized, system realizes simple, the advantage such as cheap builds the green being applicable to various electric pressure and various power bracket, energy-saving Active Front End current transformer, especially in the application of High Power Active front end current transformer, advantage is had more, there is very wide application prospect.
High-quality Active Front End current transformer implementation method based on thyristor is equally applicable to the high-quality rectifier power source of Direct Current Governor System.

Claims (3)

1. the feature that the present invention is based on the high-quality Active Front End current transformer implementation method of thyristor is that the Active Front End converter system of frequency converter is by a primary side Y winding [2] and Y and the △ secondary side winding [3] of two mutual deviations 30 degree and the phase shifting transformer of [4], the 12 pulse wave unsteady flow bridges and a set of many level DCs Current Control be made up of two identical thyristor 6 pulse wave unsteady flows bridge [5] and [6] and synthesis unit [7] form, adopt the control strategy of asymmetrical current, by many level DCs Current Control and synthesis unit [7], implement to control the current waveform of two three-phase unsteady flow bridges by the particular transform rule of (1) formula and (2) formula, [34] be the Y three-phase unsteady flow bridge output current wave of many level synthesis of the incremental steps shape triangular current waveforms such as employing, [35] be the current waveform that △ three-phase unsteady flow bridge exports, [36] be that Y three-phase unsteady flow bridge exports and △ three-phase unsteady flow bridge exports the DC side current waveform synthesized, [32] be Circuit Fault on Secondary Transformer Y winding current waveform, [33] be Circuit Fault on Secondary Transformer △ winding current waveform, [31] be the resultant current waveform that transformer primary side obtains, for low harmony wave sine waveform, by to Y three-phase unsteady flow bridge and the direct control of △ three-phase unsteady flow bridge current amplitude and the phase control of reciprocity incremental steps shape triangular current, achieve power factor adjustable arbitrarily, electric energy feedback is braked, the function that direct voltage and electric current freely regulate and control at 0 ~ nominal value range.
I BY ( ωt ) = I dc { 1 2 + Σ k = 1 ∞ 7 + 4 3 36 ( 2 k - 1 ) 2 - 1 cos [ 6 ( 2 k - 1 ) ωt ] + Σ k = 1 ∞ 1 144 k 2 - 1 cos ( 12 kωt ) - - - ( 1 )
I BΔ ( ωt ) = I dc { 1 2 - Σ k = 1 ∞ 7 + 4 3 36 ( 2 k - 1 ) 2 - 1 cos [ 6 ( 2 k - 1 ) ωt ] + Σ k = 1 ∞ 1 144 k 2 - 1 cos ( 12 kωt ) - - - ( 2 )
In formula:
I bY: Y bridge direct current
I b △: △ bridge direct current
I dc: DC side inverter load current
2. adopt following principle to realize according to many level DCs Current Control according to claim 1 and allocation units [2]:
(1) direct current equalization is assigned to m branch road, each branch road is connected to two gate-controlled switches, these two switch complementary actions, forms complementary switch pair, be connected respectively to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge, m branch road can be formed m+1 level etc. incremental steps shape triangular wave;
(2) complementary switch pair is switched every 30 °/m, the electric current of inflow Y three-phase unsteady flow bridge is made to increase a branch road amount, also make the electric current of inflow △ three-phase unsteady flow bridge reduce by a branch road amount simultaneously, interval through m 30 °/m, after all branch currents all flow into Y three-phase unsteady flow bridge, the electric current of inflow Y three-phase unsteady flow bridge is made to reduce by a branch road amount every 30 °/m again, also make the electric current of inflow △ three-phase unsteady flow bridge increase a branch road amount simultaneously, until the electric current flowing into Y three-phase unsteady flow bridge reduces to zero, repeat above process, just can by direct current by etc. the rule of incremental steps shape triangular wave distribute to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge.
3. according to the high-quality Active Front End current transformer implementation method based on thyristor according to claim 1, there is following characteristic:
low harmony wave height conversion quality, phase shifting transformer mains side current harmonic content increases with m and reduces, and the relation of THD and the m of its electric current is shown in table 1;
The relation table of table 1.THD and m
m 2 3 4 5 6 7 8 9 THD 7.77％ 5.25％ 3.99％ 3.28％ 2.77％ 2.45％ 2.20％ 2.02％
According to table 1, when m >=6, the harmonic value of phase shifting transformer mains side is limited within 3%;
thyristor is control entirely, by etc. incremental steps shape triangular current be applied to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge, the electric current that result in switching device in Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge by setting etc. the change of incremental steps shape triangular current rule; When the switching device forming Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge is thyristor, to gate circuit transistor gate triggering signal when the incremental steps shape triangular currents such as applying start, thyristor is open-minded, be during zero waiting incremental steps shape triangular current, thyristor current flows be zero be forced to turn off, namely thyristor is opened and is controlled by gate pole, electric current for zero turn off control by etc. incremental steps shape triangular current provide, both combination makes thyristor achieve the effect of full control switch; The full control of thyristor makes Trigger Angle phase shift range become-180 ° ~ 180 °, the power factor that just can realize so easily in the past using full-controlled switch device to realize can advanced or delayed continuous adjustment, power factor be the control of " 1 ", the high-touch feature that controls of electric energy feedback;
high efficiency, thyristor turns off when electric current is zero, open-minded when voltage is zero, achieves Sofe Switch control mode, and without switching loss, its operating frequency is 50Hz, and switching frequency is low, and thus gross efficiency is high;
by to be applied to Y three-phase unsteady flow bridge and △ three-phase unsteady flow bridge etc. the control of incremental steps shape triangular wave amplitude, achieve DC voltage electric current controlled on a large scale, DC side no longer needs large energy-storage travelling wave tube.
CN201310479789.9A 2013-10-15 2013-10-15 High quality Active Front End current transformer implementation method based on thyristor Expired - Fee Related CN104578833B (en)

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CN107658875A (en) * 2017-10-30 2018-02-02 镇江大全赛雪龙牵引电气有限公司 Urban track traffic thyristor-type traction rectifier and feedback converter system
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