CN104601002B - A kind of sparse formula dual stage matrix converter topological structure - Google Patents

A kind of sparse formula dual stage matrix converter topological structure Download PDF

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Publication number
CN104601002B
CN104601002B CN201410837675.1A CN201410837675A CN104601002B CN 104601002 B CN104601002 B CN 104601002B CN 201410837675 A CN201410837675 A CN 201410837675A CN 104601002 B CN104601002 B CN 104601002B
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China
Prior art keywords
way switch
phase
matrix converter
topological structure
wholly
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CN104601002A (en
Inventor
雷家兴
周波
秦显慧
卞金梁
石宝平
梁莹
韩娜
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

The invention discloses the new sparse formula dual stage matrix converter topological structure of one kind, this structure includes following part：Three two-way controllable switches, three-phase diode rectifier bridge, three-phase inverters.Rectification stage present invention, avoiding other dual stage matrix converters easily produces negative pressure and then the shortcoming of the failure that is short-circuited, and can effectively improve system reliability.Additionally, the present invention can also be widened to [90 °, 90 °] input reactive power angle adjustable range, the problem that the input side power-factor angle of traditional dual-level matrix frequency converter can only be adjusted in the range of [30 °, 30 °] is solved；Topological structure of the invention, control is simple and reliable, with practical value higher.

Description

A kind of sparse formula dual stage matrix converter topological structure
Technical field
The present invention relates to a kind of electrical energy changer, more particularly to a kind of new sparse formula dual stage matrix converter topology knot Structure.
Background technology
Matrix converter is a kind of new A C-AC converters, with small volume, lightweight and long working life spy Point, is taken as one of replacement topology of double pwm converters of current extensive application, is at home and abroad widely studied.Two-stage matrix Converter is a kind of subclass of matrix converter, including two parts of rectification stage and inverse cascade.Two parts are by the middle of direct current Dc bus is connected, but without DC energy storage element.Compared to classical matrix converter, dual stage matrix converter has clamp circuit Simply, the advantages of change of current control strategy is easily realized, obtains the extensive concern of researcher.
When system does not require that converter has bidirectional power flow kinetic force, dual stage matrix converter can also reduce switch number Amount, now it is referred to as sparse formula dual stage matrix converter.A kind of typical traditional sparse formula dual stage matrix converter topology knot Structure is as shown in Figure 1.Rectification stage is by 6 wholly-controled devices (each device includes an individual diodes) and 6 two extra poles Pipe is constituted.It in addition to it can not realize bi-directional power flow, with identical with classical matrix converter and dual stage matrix converter Function.
However, as common dual-level matrix frequency converter, structure shown in accompanying drawing 1 has a larger defect.It Rectification stage be made up of wholly-controled device, it is possible to create negative DC bus-bar voltage.Such as when input three-phase voltage meets：uA>uB> uCWhen, if in conducting rectification stage C phases under bridge arm and A phases bridge arm wholly-controled device, DC bus-bar voltage udc=uC-uA<0.This When negative pressure can not be blocked due to the diode of inverse cascade each bridge arm, short trouble will occur, and endanger system safety.This feelings The vibration of condition generally existing in systems in practice, such as input side and electromagnetic interference reason trigger rectification stage full-controlled device mistake to lead It is logical.Importantly, existing document is proved, and when input power factor angle is more than 30 ° or less than -30 °, DC bus-bar voltage The situation of negative value necessarily occurs.Therefore also be limited at the input power factor angle of traditional Sparse Matrix Converter by drawbacks described above In [- 30 °, 30 °], the reactive power regulatory function of converter is have impact on.
The content of the invention
Technical problem to be solved：
It is an object of the invention to provide a kind of new sparse formula two-stage matrix for avoiding rectification stage that negative pressure occurs conversion Device topological structure.
Technical scheme：
In order to realize function above, the invention provides the new sparse formula dual stage matrix converter topological structure of one kind, its It is characterised by：Including three two-way switch, rectification stage and inverse cascades；
Wherein rectification stage includes six diodes, and inverse cascade includes six wholly-controled devices, is input into three-phase alternating voltage (uA、uB、uC) the three-phase alternating current end of rectification stage, rectification are connected to by two-way switch S1, two-way switch S2, two-way switch S3 respectively The dc bus of level is connected with the dc bus of inverse cascade, output three-phase alternating voltage (uU、uV、uW) it is connected to the three-phase of inverse cascade Exchange end.
Each two-way switch is constituted by 2 wholly-controled device common emitters, and one in parallel of each wholly-controled device is reversely Body diode.
2 wholly-controled devices of each two-way switch use identical pwm control signal, and the dutycycle of two-way switch S1 is d1, the dutycycle of two-way switch S2 is d2, the dutycycle of two-way switch S3 is d3, they are determined by following formula：
Wherein, | uA|、|uB|、|uC| three-phase input voltage u is represented respectivelyA、uB、uCAbsolute value, uimaxRepresent | uA|、|uB |、|uC| in maximum.
Within each two-way switch cycle, input voltage absolute value is equal to uimaxThat phase the permanent conducting of two-way switch, The two-way switch of remaining two-phase is according to each self-corresponding dutycycle alternate conduction.
Beneficial effect：
It can be seen from above-mentioned technical scheme that, the new sparse formula dual stage matrix converter topological structure that the present invention is provided There is following benefit effect compared with prior art：
1st, in the present invention, rectification stage can produce negative pressure in no instance, will not be by the bridge arm two of inverse cascade Pole pipe is short-circuited failure, is advantageous to the reliability of raising system；
2nd, the present invention can also be widened to [- 90 °, 90 °] input power factor angle adjustable range, breach original twin-stage square Battle array converter can only adjust the limitation at input power factor angle in the range of [- 30 °, 30 °]；
3rd, in the present invention, the control of three two-way switch is very convenient, and dutycycle calculates simple, and need not during commutation Dead Time is set.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples：
A kind of typical traditional Sparse Matrix Converter topological structures of Fig. 1；
The new sparse formula dual stage matrix converter topological structure of Fig. 2 one kind proposed by the present invention；
The composition structure chart of Fig. 3 two-way switch；
Three dutycycle expression formulas of two-way switch in mono- input voltage cycle of Fig. 4；
Three drive waveforms figure (u of two-way switch in mono- switch periods of Fig. 5A>0>uB>uC)。
Specific embodiment
The present invention provides a kind of new sparse formula dual stage matrix converter topological structure, to make the purpose of the present invention, technology Scheme and effect are clearer, clearly, and referring to the drawings and give an actual example that the present invention is described in more detail.It should be appreciated that Specific implementation described herein is only used to explain the present invention, is not intended to limit the present invention.
System architecture proposed by the present invention is as shown in Figure 2.Three-phase input voltage (uA、uB、uC) two-way by three respectively Switch (S1, S2, S3) is connected to the input of rectification stage, and rectification stage is made up of six diodes, the dc bus of rectification stage and inverse The dc bus for becoming level connects, and inverse cascade is made up of a common three-phase inverter, three-phase output voltage (uU、uV、uW) it is connected to inverse Become the three-phase alternating current end of level.In accompanying drawing 2, three two-way switch are four-quadrant switches, can flow through bidirectional current, can also be blocked two-way Voltage.As shown in Figure 3, each two-way switch is by two wholly-controled device (occlusion bodies for the bi-directional switch structure that the present invention is used Diode) common emitter connects to be formed.The such two-way switch of selection can reduce the quantity of isolation drive power supply, simplify drive circuit Design, reduce circuit stray inductance.
Three two-way switch S1, S2, S3 turn on one effective switch combination of generation, such as a total of three kinds of combinations, table 1 two-by-two It is shown.For example, when S1 and S2 conductings, S3 shut-offs is switched, DC bus-bar voltage udc=| uA-uB|, wherein, absolute value sign | | Represent the full-wave rectification effect of rectification stage diode.When S1, S2, S3 are turned on entirely, now rectification stage is common three-phase full-wave Rectification, DC bus-bar voltage be in table 1 three kinds of voltage any one, therefore the combination is nor effective switch combination.When Only one of which switch conduction or when not having switch conduction in S1, S2, S3, DC bus-bar voltage is 0, therefore nor effective Switch combination.As shown in Table 1, no matter why three-phase input voltage is worth, and DC bus-bar voltage may be selected to be three line electricity of input Any one of pressure, this characteristic is that all matrix converters realize that sinusoidal input is necessary.So structure shown in the present invention Also input current sineization can be realized.
The relation of 1 three conducting states of two-way switch of table and DC bus-bar voltage
S1 S2 S3
Conducting Conducting Shut-off
Conducting Shut-off Conducting
Shut-off Conducting Conducting
Also known by accompanying drawing 2 and table 1, because rectification stage is constituted by a diode, the unilateal conduction characteristic of diode is caused directly Stream busbar voltage one be set on the occasion of.Therefore, no matter how three two-way switch in input line control, and rectification stage is all without generation Negative pressure, enters without the failure that is short-circuited.Particularly, if three two-way switch are simultaneously turned on, now whole topological structure can be waited Imitate into the connection of diode uncontrollable rectifier bridge and inverter, input three-phase will not be short-circuited failure.And such case is in tradition Can all trigger phase fault in matrix converter, dual stage matrix converter and traditional sparse formula dual stage matrix converter, produce Electric current, endangers the safety of power device.
DC bus-bar voltage one is set to and also causes that input power factor angle can be in [- 90 °, 90 °] scope on the occasion of this characteristic Interior any regulation.In other dual stage matrix converters, when input power factor angle is not in the range of [- 30 °, 30 °], direct current Busbar voltage occurs negative value, triggers short trouble.And in topological structure of the invention, even if input power factor angle does not exist [- 30 °, 30 °], the rectified action of rectification stage also ensure that DC bus-bar voltage is not in negative value.Therefore, the present invention is than other Dual stage matrix converter has broader power-factor angle adjustable range.
Topology merging method shown in accompanying drawing 2 is also very simple, and inverse cascade can be adjusted using traditional space vector of voltage Algorithm processed.Different from other matrix converters, the present invention only has three two-way switch, and they only need to three road pwm control signals (two wholly-controled devices of each two-way switch can share pwm control signal all the way).To ensure the sine degree of input current, three The dutycycle of individual two-way switch is determined by following formula：
In formula, d1、d2、d3The respectively dutycycle of two-way switch S1, S2, S3, | uA|、|uB|、|uC| three-phase is represented respectively Input voltage uA、uB、uCAbsolute value, uimaxRepresent | uA|、|uB|、|uC| in maximum.Accompanying drawing 4 is a supply voltage week In phase, d1、d2And d3Expression formula.Under a kind of this control mode, the electric current and absolute value of voltage of every phase input voltage are flowed through It is directly proportional.This is identical with the characteristic of other matrix converters, therefore the control method ensure that the sine degree of input current.Work as uA >0>uB>uCWhen, in a switch periods, the drive waveforms of S1, S2, S3 are as shown in Figure 5.Input three-phase voltage uA、uBAnd uC When, can also carry out similar analysis.In accompanying drawing 5, TsSwitch periods are represented, " 1 " represents correspondence switch conduction, and " 0 " represents that correspondence is opened Shut-off, d2TsRepresent the time of two-way switch S2 conductings, d3TsRepresent the time of two-way switch S3 conductings.As seen from the figure, now Two-way switch S1 permanent conducting, two-way switch S2 and S3 alternate conduction in a switch periods.When the conducting state of S2 and S3 is entered During row switching, their drive signal need not set dead band.Because, even if S2 and S3 are simultaneously turned on, due to rectification stage Diode unilateal conduction characteristic, input B phases and C phases will not be short-circuited failure.This characteristic is also topological structure of the invention Relative to another advantage of other dual stage matrix converter topological structures.
It is understood that for those of ordinary skills, can be with technology according to the present invention scheme and its hair Bright design is subject to equivalent or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention Shield scope.

Claims (2)

1. a kind of sparse formula dual stage matrix converter topological structure, it is characterised in that：Including three two-way switch, rectification stage and inverse Become level；Wherein rectification stage includes six diodes, and inverse cascade includes six wholly-controled devices, input three-phase alternating voltage (uA、uB、 uC) be connected to the three-phase alternating current end of rectification stage by two-way switch S1, two-way switch S2, two-way switch S3 respectively, rectification stage it is straight Stream bus is connected with the dc bus of inverse cascade, output three-phase alternating voltage (uU、uV、uW) it is connected to the three-phase alternating current end of inverse cascade； Each two-way switch is constituted by 2 wholly-controled device common emitters, each wholly-controled device one reverse body diode of parallel connection； 2 wholly-controled devices of each two-way switch use identical pwm control signal, and the dutycycle of two-way switch S1 is d1, it is two-way The dutycycle for switching S2 is d2, the dutycycle of two-way switch S3 is d3, they are determined by following formula：
d 1 = | u A | u i m a x d 2 = | u B | u i max d 3 = | u C | u i m a x
Wherein, | uA|、|uB|、|uC| three-phase input voltage u is represented respectivelyA、uB、uCAbsolute value, uimaxRepresent | uA|、|uB|、|uC | in maximum.
2. a kind of sparse formula dual stage matrix converter topological structure according to claim 1, it is characterised in that：It is double at each To in switch periods, input voltage absolute value is equal to uimaxThat phase the permanent conducting of two-way switch, the two-way opened of remaining two-phase Close according to each self-corresponding dutycycle alternate conduction.
CN201410837675.1A 2014-12-29 2014-12-29 A kind of sparse formula dual stage matrix converter topological structure Expired - Fee Related CN104601002B (en)

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CN108418450B (en) * 2018-02-27 2020-09-25 西安理工大学 Voltage-adjustable PWM rectifier and APFC control method thereof
CN108400718A (en) * 2018-02-27 2018-08-14 西安理工大学 A kind of pressure-adjustable PWM rectifier topology based on IGBT
CN113300614A (en) * 2021-05-29 2021-08-24 湖南工业大学 Novel ultra-sparse matrix converter topological structure containing gamma source circuit

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CN102611349A (en) * 2012-03-15 2012-07-25 南京航空航天大学 AC (alternating current) start/power generation system based on two-stage matrix converter and control method thereof
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