CN101807877A - Control method for matrix frequency converter during supply of DC source - Google Patents
Control method for matrix frequency converter during supply of DC source Download PDFInfo
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- CN101807877A CN101807877A CN200910056874A CN200910056874A CN101807877A CN 101807877 A CN101807877 A CN 101807877A CN 200910056874 A CN200910056874 A CN 200910056874A CN 200910056874 A CN200910056874 A CN 200910056874A CN 101807877 A CN101807877 A CN 101807877A
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Abstract
The invention discloses a control method for a matrix frequency converter during supply of a DC source. Under the condition of the supply of the DC source, a positive pole and a negative pole of the DC source are respectively connected to three input ends of the matrix frequency converter correspondingly, namely an R input end, an S input end and a T input end; and the matrix frequency converter converts DC into AC to drive a motor to work. The control method can control the motor to normally work by adopting the DC source under the condition that a three-phase AC source is powered off.
Description
Technical field
The present invention relates to the control method of a kind of matrix frequency converter when DC power supply.
Background technology
As shown in Figure 2, traditional frequency converter generally adopts the structure of handing over orthogonal.Rectifier bridge heap 1 AC rectification with three-phase alternating-current supply becomes direct current to give big electric capacity 3 chargings, and inversion assembly 4 is transformed into alternating current to direct current, CD-ROM drive motor 5 runnings.When three-phase alternating-current supply had a power failure, frequency converter can be directly connected to the positive and negative electrode of storage battery 2 (DC power supply) on the big electric capacity 3 of major loop, gave 4 power supplies of inversion assembly with CD-ROM drive motor 5 runnings.For inversion assembly 4, the direct current that rectifier bridge heap 1 and storage battery 2 provide does not have essential distinction, and inversion assembly 4 can both 5 runnings of driven motor.
Referring to Fig. 1, matrix frequency converter is the structure of friendship-friendship Direct Conversion.Typical matrix frequency converter generally adopts the three-phase input three-phase way of output, and input terminal connects the three-phase alternating-current supply (R, S, T) of electric power system, and lead-out terminal connects three phase windings (U, V, W) of motor.Controller 7 detects supply voltages by incoming line 9, and after carrying out matrixing and calculating, output trigger impulse 8 power controlling assemblies 6 are directly converted to 5 runnings of alternating current CD-ROM drive motor with the alternating current of three-phase alternating-current supply.
Because characteristics such as matrix frequency converter has that input power factor can be regulated arbitrarily, but power two-way flow, output voltage and frequency adjustable and compact conformation, volume are little, efficient height make it become a focus that drags the control field gradually.In many applications, have a power failure at three-phase alternating-current supply, and can only provide under the situation of DC power supply (generally with storage battery for direct current) to matrix frequency converter, also need the matrix frequency converter can also the driven motor running.But not having big electric capacity on the major loop of matrix frequency converter, when three-phase alternating-current supply has a power failure, is the connected mode that can not directly adopt the traditional frequency conversion device if DC power supply is connected on the matrix frequency converter.
Summary of the invention
The technical problem to be solved in the present invention provides the control method of a kind of matrix frequency converter when DC power supply, can adopt the normal operation of DC power supply control motor under the situation that three-phase alternating-current supply has a power failure.
For solving the problems of the technologies described above, the control method of matrix frequency converter of the present invention when direct current supply is, under the situation of DC power supply, positive pole and corresponding respectively three inputs that are connected to matrix frequency converter of negative pole with DC power supply, be R input, S input and T input, matrix frequency converter is transformed into alternating current with direct current, the CD-ROM drive motor running.
Adopt method of the present invention, mode when matrix frequency converter fully can be according to normal three-phase alternating-current supply power voltage supply is carried out variable frequency control, the needs that use DC power supply control motor under the three-phase alternating-current supply power-off condition are satisfied in the alternating current CD-ROM drive motor running of output variable-frequency variable-voltage.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is the structure chart that matrix frequency converter adopts control method of the present invention;
Fig. 2 is existing traditional frequency conversion device structure chart;
Fig. 3 is the oscillogram of three-phase alternating-current supply voltage.
Embodiment
The control strategy of matrix frequency converter has multiple, as Venturini control method, means of space vector representation, scalar modulation method etc., but their control purpose is identical, and promptly Shu Chu voltage needs frequency and adjustable amplitude value, input power factor is approaching ± and 1, and input current waveform is sinusoidal.In order to achieve the above object, matrix frequency converter needs to measure in real time the three-phase alternating-current supply voltage of input, input voltage is carried out matrixing, with control output voltage and input current.
The phase voltage of three-phase alternating-current supply is set at:
U
R(t)=U
mcosθ
The line voltage of three-phase alternating-current supply is set at:
U
RS(t)=U
R(t)-U
S(t)
U
ST(t)=U
S(t)-U
T(t)
U
TR(t)=U
T(t)-U
R(t)
θ=2 π ft wherein, f is the frequency of supply voltage, U
mIt is the amplitude of phase voltage
The three-phase alternating-current supply voltage waveform as shown in Figure 3, the line voltage of six state point correspondences and angle θ value are listed in the following table 1 among the figure, wherein k is an integer.
Table 1
When three-phase alternating-current supply had a power failure, the mode that DC power supply is connected to the matrix frequency converter input had 6 kinds.For under the situation of direct current supply, matrix frequency converter is still pressed the mode variable-frequency variable-voltage of matrix, three inputs (R, S, T) of matrix frequency converter all must be connected on the positive and negative electrode of DC power supply, but three inputs can not be connected on the same electrode of DC power supply simultaneously.The mode of connection is as shown in table 2.Wherein V is the direct voltage amplitude that DC power supply provides.
Table 2
By table 1 and table 2 more as can be seen, it is closely similar that DC power supply is connected to six state points of three-phase alternating-current supply voltage waveform among the state of six kinds of mode correspondences of matrix frequency converter input and Fig. 3, unique difference is the amplitude difference of voltage.During the three-phase alternating-current supply power supply, the line absolute value of voltage of six state point correspondences has two kinds of 1.5U
mWith 0, U
mAmplitude size by the three-phase alternating-current supply phase voltage is determined.Under the situation of dc power supply, the line absolute value of voltage of six state point correspondences has two kinds of V and O, and V is the direct voltage amplitude.Galvanic device difference is provided, and the size of V may be different.
In conjunction with shown in Figure 1, under the normal situation of three-phase alternating-current supply voltage, matrix frequency converter can measure the amplitude U of three-phase alternating-current supply voltage in real time by incoming line 9
mWith angle θ, according to the requirement of control motor 5 runnings the three-phase alternating-current supply input voltage is carried out matrixing, the alternating current of output variable-frequency variable-voltage.Wherein the angle θ of three-phase alternating-current supply voltage is a real-time change, and frequency is power frequency f.
Under the situation of DC power supply, controller 7 with reference to table 2, can be judged the mode that DC power supply is connected to three input terminals of matrix frequency converter by the detection of incoming line 9, obtain corresponding state point and angle θ value, also can measure the dc voltage value V of DC power supply simultaneously.For example: when the line voltage U that measures
RS(t)=and V, U
ST(t)=0, U
TR(t)=-during V, just can judge DC power supply be connected to the matrix frequency converter input terminal the corresponding three-phase alternating-current supply of mode state point 1..At this moment, the positive pole of DC power supply is connected on the input terminal R of matrix frequency converter, and the negative pole of DC power supply is connected on the input terminal S and T of matrix frequency converter, and angle θ value equals 0 degree.Mode when the controller 7 of matrix frequency converter fully can be according to normal power source (being three-phase alternating-current supply) power voltage supply is carried out variable frequency control, and the alternating current of output variable-frequency variable-voltage goes CD-ROM drive motor 5 runnings.Unique difference is that angle θ is indeclinable, and the supply voltage amplitude is V.
Claims (3)
1. the control method of a matrix frequency converter when DC power supply, it is characterized in that: under the situation of DC power supply, positive pole and corresponding respectively three inputs that are connected to matrix frequency converter of negative pole with DC power supply, be R input, S input and T input, matrix frequency converter is transformed into alternating current with direct current, the CD-ROM drive motor running.
2. control method as claimed in claim 1 is characterized in that: the positive pole of described DC power supply and negative pole are connected to R input, S input and the T input of matrix frequency converter by one of following six kinds of modes;
First kind, the described anodal R input that connects, negative pole connects S input and T input;
Second kind, described anodal R input and the S input of connecting, negative pole connects the T input;
The third, the described anodal S input that connects, negative pole connects R input and T input;
The 4th kind, described anodal S input and the T input of connecting, negative pole connects the R input;
The 5th kind, the described anodal T input that connects, negative pole connects R input and S input;
The 6th kind, described anodal R input and the T input of connecting, negative pole connects the S input;
Described six kinds of connected modes are six state points of corresponding three-phase alternating-current supply voltage respectively, and matrix frequency converter carries out matrixing, output AC by the angle and the actual voltage value of six state point correspondences to DC power supply.
3. control method as claimed in claim 2 is characterized in that:
The state point 1 of first kind of corresponding three-phase alternating-current supply voltage of connected mode, the three-phase ac power cord voltage of this state point 1 and corresponding angle are:
U
RS(t)=-U
TR(t)=1.5U
m,U
ST(t)=0,θ=2πk+0;
The state point 2 of second kind of corresponding three-phase alternating-current supply voltage of connected mode, the three-phase ac power cord voltage of this state point 2 and corresponding angle are:
U
ST(t)=-U
TR(t)=1.5U
m,U
RS(t)=0,
The state point 3 of the corresponding three-phase alternating-current supply voltage of the third connected mode, the three-phase ac power cord voltage of this state point 3 and corresponding angle are:
U
ST(t)=-U
RS(t)=1.5U
m,U
TR(t)=0,
The state point 4 of the 4th kind of corresponding three-phase alternating-current supply voltage of connected mode, the three-phase ac power cord voltage of this state point 4 and corresponding angle are:
U
TR(t)=-U
RS(t)=1.5U
m,U
ST(t)=0,θ=2πk+π;
The state point 5 of the 5th kind of corresponding three-phase alternating-current supply voltage of connected mode, the three-phase ac power cord voltage of this state point 5 and corresponding angle are:
U
TR(t)=-U
ST(t)=1.5U
m,U
RS(t)=0,
The state point 6 of the 6th kind of corresponding three-phase alternating-current supply voltage of connected mode, the three-phase ac power cord voltage of this state point 6 and corresponding angle are:
U
RS(t)=-U
ST(t)=1.5U
m,U
TR(t)=0,
U wherein
mBe the amplitude of three-phase alternating-current supply phase voltage, K is an integer.
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Cited By (1)
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---|---|---|---|---|
CN102403946A (en) * | 2011-11-08 | 2012-04-04 | 杭州电子科技大学 | Equivalent AC-DC-AC matrix high voltage frequency converter control method based on space vector modulation |
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JP4273925B2 (en) * | 2002-11-29 | 2009-06-03 | 株式会社日立製作所 | Elevator system |
JP4578113B2 (en) * | 2004-01-28 | 2010-11-10 | 三菱電機株式会社 | Electric motor power failure control device |
JP4666354B2 (en) * | 2005-03-16 | 2011-04-06 | 国立大学法人長岡技術科学大学 | AC / AC power converter controller |
JP2007326449A (en) * | 2006-06-07 | 2007-12-20 | Mazda Motor Corp | Hybrid automobile |
JP4864620B2 (en) * | 2006-09-26 | 2012-02-01 | 三菱電機株式会社 | Three-phase load operation device |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN102403946A (en) * | 2011-11-08 | 2012-04-04 | 杭州电子科技大学 | Equivalent AC-DC-AC matrix high voltage frequency converter control method based on space vector modulation |
CN102403946B (en) * | 2011-11-08 | 2013-06-05 | 杭州电子科技大学 | Equivalent AC-DC-AC matrix high voltage frequency converter control method based on space vector modulation |
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