CN101860318B - Alternating current governing system for twin-stage matrix converter having anti-losing capability - Google Patents
Alternating current governing system for twin-stage matrix converter having anti-losing capability Download PDFInfo
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- CN101860318B CN101860318B CN2010101794819A CN201010179481A CN101860318B CN 101860318 B CN101860318 B CN 101860318B CN 2010101794819 A CN2010101794819 A CN 2010101794819A CN 201010179481 A CN201010179481 A CN 201010179481A CN 101860318 B CN101860318 B CN 101860318B
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Abstract
The invention provides an alternating current governing system for a twin-stage matrix converter having an anti-losing capability, which is formed by one by one connecting a three-phase power supply, a filter circuit, a three-phase PWM rectification circuit, an anti-losing circuit, a PWM inversion circuit and an induction motor. The anti-losing circuit comprises a main circuit and a control circuit and is formed by adding some assisting elements based on a middle direct current clamping circuit of the prior twin-stage matrix converter. The anti-losing circuit hardware comprises three IGBT, three diodes, an inductor and a capacitor. The invention can maintain the system property of the driving system of the twin-stage matrix converter while ensure the normal work of the system under the condition of falling the power grid and the voltage.
Description
Technical field
The invention belongs to the ac speed control technology field, relate to a kind of Alternating Current Governor System with the dual stage matrix converter of striding anergy power.
Technical background
Matrix converter is the research focus in the field of power electronics over past ten years, and it has a lot of good characteristics, and energy can two-way circulate, input and output current sinusoidal, input power factor are controlled, and it is little to need not jumbo energy storage unit, compact conformation, volume.The dual stage matrix converter that particularly on single-stage matrix converter basis, grows up; It has not only possessed the good characteristic of single-stage matrix converter; And the clamp circuit that has overcome the existence of single-stage matrix converter is huge; Deficiencies such as change of current control complicacy become a kind of power converter that development potentiality is arranged at present most.In numerous application scenarios, matrix converter is that application prospect is arranged most in AC speed regulating, and this is that extensive use by characteristics of dual stage matrix converter own and AC speed regulating determines.But; The Alternating Current Governor System that is made up of existing dual stage matrix converter structure and induction machine does not obtain the practical application in the industry in present stage, and reason is to receive power network fluctuation restriction in circuit structure of dual stage matrix converter own and the practical application greatly.And in the power network fluctuation of numerous types; Electric voltage dropping is the most common a kind of; And be to the most frequent a kind of of Alternating Current Governor System influence; Suppress for solving the influence of electric network electric voltage drop, need to change the dual stage matrix converter circuit structure or increase the fluctuation that some auxiliary circuits could make that the Alternating Current Governor System that is made up of dual stage matrix converter can be born electrical network.
Electric voltage dropping is meant that at a time the amplitude of voltage departs from normal range of operation suddenly, after very short a period of time, returns to the phenomenon of normal level again.The standard of in power quality monitoring, recommending according to IEEE 1159-1995 is that voltage reduces the 10%-90% that amplitude is the amplitude per unit value to the confining spectrum of electric voltage dropping characteristic quantity, and the duration is a half period to a minute.Generally, electric voltage dropping is held time in a few second scope, can not produce equipment and damage, but very responsive load but bring very big influence to grid disturbance like this to AC speed regulating.For traditional Alternating Current Governor System, there has been a lot of scientific workers that this is studied and provided practicable scheme, thereby made Alternating Current Governor System be used widely.But for also constituting by dual stage matrix converter, have the electric voltage dropping of overcoming, promptly have the Alternating Current Governor System of striding anergy power and also do not seen report to some extent developing.
Summary of the invention
The objective of the invention is to propose a kind of Alternating Current Governor System with the dual stage matrix converter of striding anergy power, this Alternating Current Governor System with the dual stage matrix converter of striding anergy power can overcome electric voltage dropping, has the anergy of striding power.
Technical solution of the present invention is following:
A kind of Alternating Current Governor System with the dual stage matrix converter of striding anergy power is characterized in that, by three phase mains, filter circuit, three-phase PWM rectification circuit, stride dead electricity road, PWM inverter circuit and induction machine and be connected in sequence; The described dead electricity route of striding is striden dead electricity road main circuit and the control circuit composition of striding the dead electricity road;
Striding dead electricity road main circuit comprises:
Connect three-phase PWM rectification circuit dc terminal is anodal and PWM inverter circuit dc terminal is anodal diode, an IBGT, diode is parallelly connected with an IBGT;
First branch road with the parallel connection of three-phase PWM rectification circuit dc terminal: be connected three-phase PWM rectification circuit output end anodal inductance series connection pair of diodes, the 2nd IGBT and connect three-phase PWM rectification circuit output end negative pole again; Diode is parallelly connected with the 2nd IGBT;
Second branch road with the parallel connection of PWM inverter circuit dc terminal: be connected the capacitances in series pair of diodes of PWM inverter circuit dc terminal negative pole, the dc terminal positive pole that the 3rd IGBT connects the PWM inverter circuit again;
Between the positive pole of inductance and electric capacity, be connected to a diode;
The control circuit of striding the dead electricity road is the combinational circuit of two inputs, three outputs: two inputs are respectively three-phase input power supply and the output voltage of striding the dead electricity road, and three outputs connect the trigger end of striding an IBGT, the 2nd IGBT and the 3rd IGBT in the main circuit of dead electricity road respectively.
Described control circuit of striding the dead electricity road is:
The input termination three-phase mains voltage of AC voltage transformer, the virtual rectifier of output termination, output termination first comparator of virtual rectifier and the first input end of second comparator;
Expectation rectifier output voltage signal connects second input of first comparator, the input of saw-toothed wave generator and the first input end of the 3rd comparator; Second input of output termination second comparator of saw-toothed wave generator; The input termination of direct voltage Hall element is striden the output voltage on dead electricity road, second input of output termination the 3rd comparator of direct voltage Hall element;
One output of first comparator directly connects the driver element of an IGBT, and another output connects the non-driver element that meets the 3rd IGBT behind the door again;
Connect the output of second comparator and the 3rd comparator respectively with 2 inputs of door; Driver element with output termination the 2nd IGBT of door.
Beneficial effect:
This has Alternating Current Governor System of the dual stage matrix converter of striding anergy power owing to adopted and stride the dead electricity road, strides the dead electricity road and on the basis of existing dual stage matrix converter intermediate dc clamp circuit, increases some auxiliary elements and constitute.This is striden dead electricity road hardware circuit and comprises three IGBT, three diodes, an inductance and an electric capacity.When falling appears in line voltage, stride the dead electricity road and play a role, rise the voltage of PWM rectification circuit output through pump, ensure that inverse cascade keeps the input voltage of expectation, make system can be when electric network electric voltage drop operate as normal still.
Description of drawings
Fig. 1 serves as reasons and has the Alternating Current Governor System structural representation that dual stage matrix converter constitutes now;
Fig. 2 is by dual stage matrix converter basic structure and strides the Alternating Current Governor System structural representation that the dead electricity road constitutes;
Fig. 3 is the structural representation of striding control unit in the dead electricity road.
Embodiment
Below combination figure and practical implementation process are explained further details to the present invention:
Embodiment 1:
Like Fig. 1, the Alternating Current Governor System that Fig. 1 describes for constituting by dual stage matrix converter, it is made up of three phase mains 1, filter circuit 2, three-phase PWM rectification circuit 3, clamp circuit 41, PWM inverter circuit 5 and induction machine 6.
Clearly, different with the conventional AC governing system is that the every phase upper and lower bridge arm of the three-phase of its rectification stage all is to be coupled to form by two IGBT and two diodes 34, constitutes the circuit that electric current can two-way circulate; What the intermediate dc end connected rectification stage and inverse cascade is by an electric capacity 8 and the clamp circuit 41 that diode 35 is formed.In addition, more than it the input filter of forming by three phase capacitance 18 and inductance 17 that is connected with three phase mains 16.Because the centre has lacked big electric capacity and inductance, it is compact that system seems, in fact than traditional Alternating Current Governor System, it not only has the multiple advantage on the input and output performance, and high power density ratio also is its big characteristics.
However, owing to lacked big electric capacity in the middle of it, the output voltage of PWM inverter circuit is directly imported line voltage to be influenced.When input voltage has disturbance, directly be reflected in output voltage, cause system performance degradation.When electric voltage dropping, rectification stage carries out rectification according to PWM rectification principle, and rectification stage output this moment commutating voltage reduces; And inverse cascade is still according to carrying out space vector modulation under the normal condition, but because the value when this moment, available direct voltage was less than normal condition, thus inverse cascade not only output voltage reduce, and possibly cause the distortion of output current.Therefore, fall the period, need correct circuit topological structure for the degree of safety overvoltage.
Fig. 2: for having added the structural representation of the Alternating Current Governor System that the dual stage matrix converter of striding dead electricity road 4 constitutes.Stride dead electricity road 4 and replaced the clamp circuit 41 among original Fig. 1, carefully comparison can be known, strides still to comprise clamp circuit in the dead electricity road 4.Striding dead electricity road 4 forms with the control circuit of striding the dead electricity road by striding dead electricity road main circuit 19: stride pair of diodes 20, the IBGT12 of dead electricity road main circuit 19 by series connection rectification stage and inverse cascade; A branch road with the rectification stage parallel connection: be connected the anodal inductance of dc terminal 7 series connection pair of diodes 21, the 2nd IGBT13 series direct current end negative pole again; A branch road with inverse cascade parallel connection: the electric capacity 8 series connection pair of diodes 22, the 3rd IGBT14 that are connected dc terminal negative pole series direct current are again rectified the utmost point, connect the inductance 7 of two branch roads, a diode 15 compositions of electric capacity 8; The control circuit of striding the dead electricity road is the combinational circuit of two inputs, three outputs: two inputs are respectively three-phase input power supply 9 and stride dead electricity road output voltage 10; Three outputs 11 connect respectively strides three IGBT in the dead electricity road main circuit 19, and different according to the power of system, IGBT, diode, inductance and the electric capacity of striding in the dead electricity road are different; For the small-power occasion; When system connected the three-phase mains, the inductance 7 of striding in the dead electricity road 4 was chosen as 200uH, and electric capacity 8 is chosen as 30uF; Such capacitor and inductor volume is not very big, and is little to the volume influence of real system.
When three phase mains 16 just often; The one IGBT12 of series connection rectification stage and inverse cascade is in conducting state always; Make energy to flow to rectification stage from inverse cascade; Meanwhile since with the effect of the diode 20 of its reverse parallel connection, energy also can flow to inverse cascade from rectification stage, thereby has guaranteed two-way circulating of energy; Meanwhile, the 2nd IGBT13 of inductance 7 and the 3rd IGBT14 of electric capacity 8 are in off-state always, and the diode 22 of electric capacity 8 still forms the clamp circuit 41 among Fig. 1 with electric capacity 8 like this; At this moment, the Alternating Current Governor System operating state that is made up of existing dual stage matrix converter among the operating state of system and Fig. 1 is identical.
When three phase mains generation disturbance; When output voltage falls; The one IGBT12 of series connection rectification stage and inverse cascade is in off-state, and be higher than anode voltage owing to diode 20 cathode voltages this moment, so do not have direct NE BY ENERGY TRANSFER between rectification stage and the inverse cascade; Meanwhile, the 3rd IGBT14 that connects with electric capacity 8 is in conducting state always, makes energy to be delivered to inverse cascade by electric capacity 8; At this moment; The 2nd IGBT13 that connects with inductance 7 is opening and is breaking off variation at a high speed between the two states: when it is in conducting state; Electric current flows to brachium pontis under the rectification stage through inductance again through brachium pontis on the rectification stage; This moment, inductance 7 can store certain energy, and electric capacity 8 is that inverse cascade provides energy through the 3rd IGBT14 at this moment then; When it is in off-state; Electric current is through diode 15 afterflows between inductance 7 and the electric capacity 8; Energy stored is transferred on the electric capacity 8 on the inductance 7 at this moment; Like this, just can make in the electric voltage dropping process that electric capacity 8 can be kept the input voltage of the inverse cascade expectation of expectation through suitable control the 2nd IGBT13.
The drive signal of three IGBT provides by striding system out of control unit; Stride system out of control unit input information derive from fall identification unit with stride owner of lost property's circuit output capacitance voltage latter and have two inputs; In case detect electric voltage dropping; Then export opening and breaking off of three IGBT of respective drive signal control, another effect of striding system out of control unit is to export simultaneously to stride that to lose moment given, strides anergy power with raising.
What Fig. 3 represented is the basic principle block diagram of striding system out of control unit.AC voltage transformer 23 be input as three-phase mains voltage 9; Convert high voltage to low voltage signal and export to virtual rectifier 24; The function class of virtual rectifier 24 is like actual Three-Phase PWM Rectifier; All be that three-phase ac signal is rectified into direct current signal, their Mathematical Modeling is the same, all is
U wherein
DcDirect voltage for rectification output is scalar,
Be rectification duty ratio vector, it is that the current space vector modulation strategy of Three-Phase PWM Rectifier during according to operate as normal is confirmed,
Be the voltage vector of rectification input, wherein actual Three-Phase PWM Rectifier
Be the synthetic voltage vector of the voltage on the three phase capacitance in the filter circuit 18; And the input voltage of virtual rectifier to be AC voltage transformer 23 detect the synthetic voltage vector of three-phase voltage on the three phase capacitance 18 that obtains; There is the multiple relation between the two; And most important difference is, for actual Three-Phase PWM Rectifier, and the duty ratio vector
Realize through actual modulated, and virtual rectifier 24 only is the computing of pure mathematics that the result who calculates is the output voltage u of virtual rectifier 24
Dc, the value that virtual like this rectifier 24 draws for being directly proportional with the output voltage of actual rectification stage; The rectifier output voltage that is input as expectation of saw-toothed wave generator 25; Be the output voltage of the rectification stage 3 under the voltage normal condition, this moment, the desired output voltage range of input was consistent with the scope of AC voltage transformer 23 output voltages after rectification, as the amplitude of saw-toothed wave generator 25; The frequency of saw-toothed wave generator 25 can be confirmed according to the actual requirements; During electric network electric voltage drop, the frequency of saw-toothed wave generator 25 is exactly the PWM modulating frequency of striding the dead electricity road, and is a Boost circuit when striding dead electricity road 4 work; General requirement according to design Boost circuit; The characteristics of dividing two sections modulation when considering PWM inverter circuit actual modulated simultaneously at a PWM in the cycle can be lower than the frequency of general Boost circuit design, select 10K-30K to meet the demands; 24 outputs of virtual rectifier and saw-toothed wave generator 25 outputs are as the input of the two the second comparators 28, and when virtual rectifier 24 outputs were higher than saw-toothed wave generator 25 and export, second comparator 28 was output as high level, on the contrary output low level then.When electric voltage dropping took place, the output of saw-toothed wave generator 25 in one-period was from the zero expectation amplitude that is increased to like this, and the high-low level of second comparator, 28 outputs is respectively kept a period of time in one-period.When voltage just often, the output of virtual rectifier 24 equals saw-toothed wave generator 25 output, thereby second comparator, 28 output low levels.The output of second comparator 28 connects the end with door 30.When the input of 24 outputs of virtual rectification stage and expectation rectifier output voltage as first comparator 27; When the former equals the latter; First comparator 27 is output as high level; Otherwise output low level, an output of first comparator 27 directly connects second driver element 32 of IGBT12, and another output connects first driver element 31 that meets the 3rd IGBT14 behind the not gate 34 again.
Be input as the output of the 3rd comparator 29 with another of door 30; Two inputs of the 3rd comparator 29 are respectively rectification stage 3 output voltages and the output voltage 10 of striding dead electricity road 4 of expectation, and the latter 10 has converted to behind direct voltage Hall element 26 and the magnitude of voltage of expecting that the rectifier output voltage scope is identical; When the output voltage of striding dead electricity road 4 10 was higher than the expectation rectifier output voltage, the 3rd comparator 29 was output as low level, otherwise is output as high level.Connect the 3rd driver element 33 of IGBT13 with the output of door 30.Like this, when electric voltage dropping, and stride dead electricity road 4 output voltages 10, when promptly inverse cascade 5 input voltages 9 are lower than expectation rectification stage output voltage, be output as high level and low level with door 30 in the sawtooth period; Other situation are with the low level that is always of door 30 outputs.With corresponding with door 30 output high-low levels be conducting and the shutoff of the 2nd IGBT13.
Above-mentioned the present invention is detailed; But what need statement a bit is; Dead electricity road 4 main circuits 19 of striding among the present invention are bases, though above provided its control unit, this only is a kind of controlling schemes; Can combine with the control to dual stage matrix converter the control of striding dead electricity road 4 main circuits 19 and to carry out, promptly control method is not unique.
Claims (2)
1. Alternating Current Governor System with the dual stage matrix converter of striding anergy power; It is characterized in that, by three phase mains (1), filter circuit (2), three-phase PWM rectification circuit (3), stride dead electricity road (4), PWM inverter circuit (5) and induction machine (6) and be connected in sequence; Describedly stride the control circuit that the dead electricity route strides dead electricity road main circuit (19) and stride the dead electricity road and form;
Striding dead electricity road main circuit (19) comprising:
Connect three-phase PWM rectification circuit (3) dc terminal is anodal and PWM inverter circuit (5) dc terminal is anodal first diode (20), an IGBT (12), first diode (20) is parallelly connected with an IGBT (12);
First branch road with the parallel connection of three-phase PWM rectification circuit (3) dc terminal: inductance (7) series connection second diode (21), the 2nd IGBT (13) that are connected three-phase PWM rectification circuit (3) output head anode connect three-phase PWM rectification circuit (3) negative pole of output end again; Second diode (21) is parallelly connected with the 2nd IGBT (13);
Second branch road with the parallel connection of PWM inverter circuit (5) dc terminal: be connected electric capacity (8) series connection the 3rd diode (22) of PWM inverter circuit (5) dc terminal negative pole, the dc terminal positive pole that the 3rd IGBT (14) connects PWM inverter circuit (5) again; Between the positive pole of inductance (7) and electric capacity (8), be connected to one the 4th diode (15);
The control circuit of striding the dead electricity road is the combinational circuit of two inputs, three outputs: two inputs are respectively three-phase input power supply and the output voltage of striding the dead electricity road, and three outputs connect the trigger end of striding an IGBT (12), the 2nd IGBT (13) and the 3rd IGBT (14) in the dead electricity road main circuit (19) respectively.
2. the Alternating Current Governor System with the dual stage matrix converter of striding anergy power according to claim 1 is characterized in that, described control circuit of striding the dead electricity road is:
The input termination three-phase mains voltage (9) of AC voltage transformer (23), the output virtual rectifier of termination (24), output termination first comparator (27) of virtual rectifier (24) and the first input end of second comparator (28);
Expectation rectifier output voltage signal connects second input of first comparator (27), the input of saw-toothed wave generator (25) and the first input end of the 3rd comparator (29); Second input of output termination second comparator (28) of saw-toothed wave generator (25); The input termination of direct voltage Hall element (26) is striden the output voltage on dead electricity road, second input of output termination the 3rd comparator (29) of direct voltage Hall element (26);
One output of first comparator (27) directly connects the driver element of an IGBT (12), and another output connects the driver element that connects the 3rd IGBT (14) behind the not gate (34) again;
Connect the output of second comparator (28) and the 3rd comparator (29) respectively with 2 inputs of door (30); Driver element with output termination the 2nd IGBT (13) of door (30).
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| CN102751945A (en) * | 2012-02-09 | 2012-10-24 | 上海交通大学 | Large-power alternating current-alternating current variable frequency speed regulating system suitable for large-power mine hoist |
| CN103973183B (en) * | 2013-01-29 | 2016-08-03 | 庞志森 | The indirect-type matrix control system of electricity oil energy mix conversion electric drive boats and ships |
| CN104578725B (en) * | 2014-12-29 | 2017-06-13 | 南京航空航天大学 | The dual-level matrix frequency converter topological structure of exportable alternating voltage and DC voltage |
| CN104883071B (en) * | 2015-05-22 | 2017-07-28 | 中南大学 | A kind of same phase towards multimode matrix converter is laminated carrier modulating method |
| CN106655798B (en) * | 2016-11-25 | 2023-02-28 | 广东百事泰医疗器械股份有限公司 | Sine wave intelligent boost conversion device |
| CN109873565B (en) * | 2019-03-11 | 2020-09-08 | 中国矿业大学 | Novel topology of two-stage matrix converter and common-mode voltage suppression strategy thereof |
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| JPH0951683A (en) * | 1995-08-04 | 1997-02-18 | Kansai Electric Power Co Inc:The | Motor drive device |
| CN100407547C (en) * | 2000-01-28 | 2008-07-30 | 康明斯发电机技术有限公司 | AC power generating system |
| US8030791B2 (en) * | 2008-07-31 | 2011-10-04 | Rockwell Automation Technologies, Inc. | Current source converter-based wind energy system |
| CN101527539B (en) * | 2009-04-30 | 2011-01-05 | 广东华拿东方能源有限公司 | Speed adjustment control system of anti-inversion failure seamless switching motor and control method thereof |
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