CN101951161B - Control system for suppressing current oscillation and distortion of three phase-single phase matrix converter - Google Patents
Control system for suppressing current oscillation and distortion of three phase-single phase matrix converter Download PDFInfo
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- CN101951161B CN101951161B CN2010102950015A CN201010295001A CN101951161B CN 101951161 B CN101951161 B CN 101951161B CN 2010102950015 A CN2010102950015 A CN 2010102950015A CN 201010295001 A CN201010295001 A CN 201010295001A CN 101951161 B CN101951161 B CN 101951161B
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Abstract
The invention discloses a control system for suppressing the current oscillation and distortion of a three phase-single phase matrix converter. A main circuit of the three phase-single phase matrix converter consists of six bilateral switches. The control system for the three phase-single phase matrix converter is characterized by comprising an input voltage sampling unit, an input and output over-current fault detection unit, a TMS320LF2812 master controller, an EPM1270 secondary controller and a drive circuit. Aiming to solve the problem of the oscillation of input current and the distortion of output current in the switching of input sectors of the dual-voltage modulation synthesis policy-based three phase-single phase matrix converter, the control system adopts an improved dual-voltage modulation synthesis method for redistributing trigger pulses to reduce the oscillation of the input current and the distortion of the output current at the same time of ensuring an output voltage is an expected voltage value.
Description
Technical field
The present invention relates to a kind of three-phase-single-phase matrix convertor, especially adopt the synthetic modulation strategy of two voltages to realize the occasion of frequency conversion to three-phase-single-phase matrix convertor.
Background technology
Matrix converter (Matrix Converter) is proposed in 1980 by Venturini and Alesina at first, has passed through continuous research and improvement subsequently.But since the complexity of matrix converter itself with and the complexity controlled, make it still not be widely used so far.Along with continuous advancement in technology, particularly in recent years because the appearance of novel electric power device such as NIGBT, RB-IGBT, and the appearance of high performance DSP control chip makes the research of matrix converter enter into a new stage.Comprise the bidirectional switch design, EMI problem and Design of Filter, protection problem etc.Wherein the change of current of two bidirectional switchs is sixty-four dollar questions, and many at present methods with the multistep change of current solve, and these progressive matrix converters that make the most at last get into practise area.
Along with increasing of single-phase variable frequency power supply demand; Three-phase-single-phase matrix convertor has obtained concern; Like Y.Miura, s.Kokubo, people such as D.Maekawa proposed three-phase-single-phase matrix convertor is used and small-sized synchronous generator control system in paper " Power Modulation Control of a Three-phase to Single-phaseMatrix Converter for a Gas Engine Cogeneration System.PESC; 2008 " in 2008, improved system effectiveness; And Somnida Ratanapanachote; Han JU Cha; People such as PrasadN Enjeti proposed to be applied in the Switching Power Supply in paper " A Digitally Controlled Switch Mode Power Supply Based on MatrixConverter.IEEE Transactions on Power Electronics; 2006 " in 2006, and the three-phase main-frequency alternating current is transformed to single-phase high-frequency alternating current; Also has the plum poplar; Sun Kai; People such as Zhou Daning proposed to be applied in the electric railway auxiliary system in paper " Application of MatrixConverter in Auxiliary Drive System for Diesel Locomotives.Industry Application Conference, 2005 " in 2005.
Research to three-phase-single-phase matrix convertor at present mainly concentrates on topological structure and control strategy; And based on the three-phase-single-phase invertor of the synthetic modulation strategy of two voltages owing to have advantages such as uneven disturbance and the maximum linear voltage transmission of automatic inhibition input voltage compare, and received more concern.But in three-phase-single-phase matrix convertor based on the synthetic modulation strategy of two voltages; Owing to adopt fixing trigger impulse distribution mode; Cause change in location when the input current pulse is switched in the input sector, the input current reforming phenomena occurred, reduced the stability of system; And cause the outlet side current distortion, reduced system's output quality.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point; A kind of three-phase-concussion of single-phase matrix convertor input current and output current Distortion Control system that be used to suppress is provided; When guaranteeing output voltage, reduce the input current concussion and the output current distortion of three-phase-single-phase matrix convertor.
Technical solution problem of the present invention adopts following technical scheme:
The present invention is used to suppress three-phase-single-phase matrix convertor current oscillation and Distortion Control system, and its three-phase-single-phase matrix convertor main circuit is to be made up of six bidirectional switchs; Its design feature is in the control system of said three-phase-single-phase matrix convertor, to include input voltage sampling unit, input and output over current fault detecting unit, TMS320LF2812 master controller, EPM1270 assistant controller and drive circuit;
Said input voltage sampling unit, any two-way input line voltage of sampling, and send into the TMS320LF2812 master controller, with sector under definite input voltage;
Said input and output over current fault detecting unit detects the overcurrent information of instantaneous net side power supply and load, and sends into the EPM1270 assistant controller, delivers to the TMS320LF2812 master controller simultaneously;
Said TMS320LF2812 master controller, sector auxiliary information under said EPM1270 assistant controller sends input line voltage in real time is in order to judge the sector state of input voltage; The output voltage information of given three-phase-single-phase matrix convertor in said TMS320LF2812 master controller; With sector under the said output voltage information judgement output voltage; Adopt two voltage synthetic methods to obtain duty ratio in real time by said input voltage and output voltage; According to said trigger impulse distribution mode duty ratio is adjusted, adjusted duty ratio is outputed to the EPM1270 assistant controller, send output voltage sector and synchronizing signal simultaneously to the EPM1270 assistant controller;
Said EPM1270 assistant controller is decoded according to said trigger impulse distribution mode to input voltage sector, output voltage sector, duty ratio and the synchronizing signal of the output of TMS320LF2812 master controller, to reduce the variation of input current pulse position in the handoff procedure of sector;
Said drive circuit is used for the driving of three-phase-single-phase matrix convertor bidirectional switch.
Said trigger impulse distribution mode is: in the handoff procedure of input voltage sector; Changing minimum with the input current pulse position is principle; In the different input voltages sector, adopt input phase voltage maximal phase or minimum phase in the trigger impulse distribution mode of the centre of switch periods respectively; Guaranteeing that the input current pulse position is constant in the handoff procedure of sector, thereby suppress the concussion of input current in the handoff procedure of sector and the distortion of output current.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, the present invention adopts the synthetic modulator approach of two voltages that the trigger impulse distribution mode is adjusted duty ratio; When guaranteeing that output voltage is desired voltage values; Can reduce the concussion of input current in the handoff procedure of sector of three-phase-single-phase matrix convertor, increase the stability of a system.
2, the present invention effectively reduces the output current distortion, and emulation and experimental result show, under equal loading condition, can reduce output current THD7.5%.
Description of drawings
Fig. 1 is the main circuit structure figure of three-phase-single-phase matrix convertor of the present invention;
Fig. 2 is the control system block diagram of three-phase-single-phase matrix convertor of the present invention;
Fig. 3 divides figure for input voltage of the present invention sector;
Fig. 4 is the trigger impulse distribution map of three-phase-single-phase matrix convertor in the prior art;
Fig. 5 is the trigger impulse distribution map of three-phase-single-phase matrix convertor in the technology of the present invention.
Below pass through embodiment, and combine accompanying drawing that the present invention is described further:
Embodiment
Referring to Fig. 1, in the present embodiment, three-phase-single-phase matrix convertor main circuit is by six bidirectional switch (s
Ap-s
Cn) constitute;
Referring to Fig. 2, in the control system of three-phase-single-phase matrix convertor, include input voltage sampling unit, input and output over current fault detecting unit, TMS320LF2812 master controller, EPM1270 assistant controller and drive circuit;
With input voltage sampling unit any two-way input line voltage of sampling, and send into the TMS320LF2812 master controller, to confirm sector under the input voltage;
With the overcurrent information of input and output over current fault detection instantaneous net side power supply and load, and send into the EPM1270 assistant controller, deliver to the TMS320LF2812 master controller simultaneously;
With TMS320LF2812 master controller sector auxiliary information under said EPM1270 assistant controller sends input line voltage in real time, in order to judge the sector state of input voltage; The output voltage information of given three-phase-single-phase matrix convertor in the TMS320LF2812 master controller; With sector under the output voltage information judgement output voltage; Adopt two voltage synthetic methods to obtain duty ratio in real time by input voltage and output voltage; According to the trigger impulse distribution mode duty ratio is adjusted, adjusted duty ratio is outputed to the EPM1270 assistant controller, send output voltage sector and synchronizing signal simultaneously to the EPM1270 assistant controller;
With the EPM1270 assistant controller input voltage sector, output voltage sector, duty ratio and the synchronizing signal of the output of TMS320LF2812 master controller are decoded according to said trigger impulse distribution mode, to reduce the variation of input current pulse position in the handoff procedure of sector;
Accomplish the driving of three-phase-single-phase matrix convertor bidirectional switch with drive circuit.
In the present embodiment; The trigger impulse distribution mode is: in the handoff procedure of input voltage sector; Changing minimum with the input current pulse position is principle; In the different input voltages sector, adopt input phase voltage maximal phase or minimum phase in the trigger impulse distribution mode of the centre of switch periods respectively, guaranteeing that the input current pulse position is constant in the handoff procedure of sector, thereby suppress the concussion of input current in the handoff procedure of sector and the distortion of output current.
Two-way input line voltage information by the sampling of input voltage sampling unit obtains after the conversion of line phase voltage, obtains three-phase phase voltage (u
a, u
b, u
c), judge maximum u in the three-phase input phase voltage
Max, middle u
Mid, minimum phase u
MinBe respectively:
Definition datum voltage u
BaseFor having the phase voltage of maximum value in the input voltage, input voltage can be divided into 12 sectors thus, and is shown in Figure 3 for dividing signal in the input voltage sector.
Definition output voltage desired value u
oBe output sector 1, u at＞0 o'clock
o＜0 is sector 2.
Be positioned at the computational methods that sector 1 is an example explanation duty ratio with output voltage,, define following intermediate variable for simplifying computing formula:
Δu
max＝u
max-u
min
In each switch periods, can get output voltage average value and be:
T in the formula
sBe switch periods, T
1, T
2, T
3Be time variable, and T
S=T
1+ T
2+ T
3, through select time variable T
1, T
2, T
3Just can obtain needed output voltage.
Definition input current distribution factor α does
I in the formula (4)
In (max), i
In (mid), i
In (min)Three-phase current is imported in expression respectively.
Can get by formula (3) and formula (4)
For reducing harmonic content, adopt the symmetrical switch pattern, promptly each duty ratio is that the center is symmetrically distributed with the mid point of switch periods.
With shown in Figure 4; Input sector 1 (Fig. 4 (a)) switches to example to sector 2 (Fig. 4 (b)) conventional trigger impulse distribution mode is described; And in input sector handoff procedure electric current present distribution of pulses change in location: in sector 1, input a phase current pulse distribution is in the 2nd, 4 parts of switch periods; In sector 2, input a phase current pulse distribution is at the mid portion of switch periods.Can know that in the handoff procedure of sector, a phase current pulse position changes; Be the current impulse variable in distance, thereby cause a phase current pulse sudden change, behind input LC filter filtering; Still can there be the concussion attenuation process; And cause the input side voltage fluctuation, reduce the stability of a system, and finally cause the output current distortion.
In order to suppress the input current concussion and to reduce the output current distortion; Need the trigger impulse position in the switch periods in the adjustment sector; Guaranteeing that the input current pulse position is constant in the handoff procedure of sector, thereby suppress the concussion of input current in the handoff procedure of sector and the distortion of output current.
Switch to the trigger impulse distribution mode among example explanation the present invention with input shown in Figure 5 sector 1 to sector 2.In input sector 1; Keep original switching mode; And the location assignment in sector 2 is as shown in Figure 5; To guarantee in input sector 1 that in 2 handoff procedures of sector the pulse of input a phase current is positioned at the 2nd, 4 parts of switch periods all the time, the pulse of c phase current is positioned at the switch periods mid portion all the time.
Handoff procedure between other sectors can get that trigger impulse distributes in each sector, and it is minimum to guarantee that in the handoff procedure of input sector the input current pulse position changes, thereby reduces that current oscillation distorts with output current in the handoff procedure of sector.The computational methods of trigger impulse distribution mode duty ratio are identical with the synthetic modulation strategy of conventional two voltages, after duty ratio calculates, it redistributed, and change to reduce the input current pulse position, guarantee that simultaneously output voltage is given output voltage values.
Claims (1)
1. be used to suppress three-phase-single-phase matrix convertor current oscillation and Distortion Control system, its three-phase-single-phase matrix convertor main circuit is to be made up of six bidirectional switchs; Its design feature is in the control system of said three-phase-single-phase matrix convertor, to include input voltage sampling unit, input and output over current fault detecting unit, TMS320LF2812 master controller, EPM1270 assistant controller and drive circuit;
Said input voltage sampling unit, any two-way input line voltage of sampling, and send into the TMS320LF2812 master controller, be used for confirming the affiliated sector of input voltage;
Said input and output over current fault detecting unit detects the overcurrent information of instantaneous net side power supply and load, and sends into the EPM1270 assistant controller, delivers to the TMS320LF2812 master controller simultaneously;
Said TMS320LF2812 master controller is sector auxiliary information under said EPM1270 assistant controller sends input voltage in real time, in order to judge the sector state of input voltage; The output voltage information of given three-phase-single-phase matrix convertor in said TMS320LF2812 master controller; With sector under the said output voltage information judgement output voltage; Adopt two voltage synthetic methods to obtain duty ratio in real time by said input voltage and output voltage; According to the trigger impulse distribution mode duty ratio is adjusted, adjusted duty ratio is outputed to the EPM1270 assistant controller, send output voltage sector information and synchronizing signal simultaneously to the EPM1270 assistant controller;
Said EPM1270 assistant controller; Input voltage sector auxiliary information, output voltage sector information, duty ratio and synchronizing signal to the output of TMS320LF2812 master controller are decoded according to said trigger impulse distribution mode, to reduce the variation of input current pulse position in the handoff procedure of sector;
Said drive circuit is used for the bidirectional switch of three-phase-single-phase matrix convertor is driven;
Said trigger impulse distribution mode is: in the handoff procedure of input voltage sector; Changing minimum with the input current pulse position is principle; In the different input voltages sector, adopt input phase voltage maximal phase or minimum phase in the trigger impulse distribution mode of the centre of switch periods respectively; So that the input current pulse position is constant in the handoff procedure of input voltage sector, suppress concussion and the distortion of output current of input current in the handoff procedure of input voltage sector.
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| CN101951161B true CN101951161B (en) | 2012-06-13 |
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| CN201860266U (en) * | 2010-09-25 | 2011-06-08 | 合肥工业大学 | Control system for suppressing current oscillation and distortion of three-phase to mono-phase matrix converter |
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