CN106877693A - A kind of circulation inhibition method of three-phase rectifier - Google Patents
A kind of circulation inhibition method of three-phase rectifier Download PDFInfo
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- CN106877693A CN106877693A CN201510913157.8A CN201510913157A CN106877693A CN 106877693 A CN106877693 A CN 106877693A CN 201510913157 A CN201510913157 A CN 201510913157A CN 106877693 A CN106877693 A CN 106877693A
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- rectifier
- phase rectifier
- circulation
- inhibition method
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of circulation inhibition method of three-phase rectifier, including the control of common DC bus three-phase rectifier, zero vector, space vector pulse width modulation（SVPWM）Three parts.The present invention establishes the model of zero sequence circulation, by controlling zero vector V7 on the basis of three-phase rectifier averaging model in parallel（111）Action time in a switch periods suppresses circulation.Be conducive to the direct parallel running of rectifier and the reliability and efficiency of system can be improved, reduce cost, and be easy to modularized design.
Description
Technical field
The present invention relates to a kind of three-phase rectifier, more particularly to a kind of circulation inhibition method of three-phase rectifier.
Background technology
With environmental protection consciousness gradually strengthen and energy demand becomes increasingly conspicuous, new energy technology increasingly becomes the focus of scholar's research, and rectifier is used widely as one of the core technology of new energy in power supply-distribution system.In order to meet requirement of the system to capacity and reliability, rectifier parallel technology is widely adopted.Rectifier parallel technology not only can be in the case where keeping the existing proof voltage of rectifier switch and resistance to levels of current constant, improve power grade, reliability and the efficiency of whole system, reduce the ripple of electric current and voltage, and be conducive to the modularized design of system, it is easy to system to reconfigure, improves the flexibility of system.
The direct parallel running of rectifier can improve the reliability and efficiency of system, reduce cost, and be easy to modularized design.But rectifier switch is acted and the inconsistency of control parameter can produce circulation, causing rectifier to be lost increases, so as to force rectifier reduction power grade to run.Control circulation is an important goal of parallel rectifier design.
Zero sequence circulation is the peculiar problem in rectifier parallel system, and the difference of the device parameters, switch motion and control parameter of parallel rectifier can all cause circulation to produce.Circulation can increase the loss of power device, reduce the efficiency of system.In order to solve circulation problem, traditional method is to use independent DC side, or uses AC transformer isolation, or zero sequence impedance etc. is improved using tap reactance.Although these methods can effectively reduce circulation size, system cost, weight and volume are increased.
The content of the invention
There is the problem of circulation in rectifier in order to overcome, the present invention proposes a kind of circulation inhibition method of three-phase rectifier.
The technical solution adopted for the present invention to solve the technical problems is.
On the basis of zero vector action effect is analyzed, by controlling space vector pulse width modulation（SVPWM）Action time of the zero vector in each PWM cycle controls circulation in algorithm.
The circulation inhibition method of three-phase rectifier includes：Common DC bus three-phase rectifier, zero vector control, space vector pulse width modulation（SVPWM）Three parts.
The common DC bus three-phase rectifier is made up of two three-phase rectifiers, and they have identical dc bus.
The zero vector control, under seven segmentation SVPWM modulation systems, can introduce a variable k to change the distribution of zero vector.
The space vector pulse width modulation（SVPWM）Pulsewidth modulation is carried out by given, the switching signal for obtaining controlling rectifier.
The beneficial effects of the invention are as follows：On the basis of three-phase rectifier averaging model in parallel, the model of zero sequence circulation is established, by controlling zero vector V7（111）Action time in a switch periods suppresses circulation.Be conducive to the direct parallel running of rectifier and the reliability and efficiency of system can be improved, reduce cost, and be easy to modularized design.
Brief description of the drawings
Fig. 1 common DC bus three-phase rectifier parallel systems.
System control principles of the Fig. 2 with zero vector control.
Specific embodiment
In Fig. 1, a, b, c are AC three-phase, and a1, b1, c1 are respectively the three-phase of rectifier 1, and a2, b2, c2 are respectively the three-phase of rectifier 2, and N, P are respectively DC terminal negative pole and positive pole.When the trigger pulse Time Inconsistency of upper and lower two sets of three-phase rectifiers, two sets of rectifier work can be caused asynchronous, at this moment electric current may circulate in two sets of rectifiers simultaneously, so as to form circulation.By taking a, b two-phase as an example, when bridge arm is turned under bridge arm in two rectifier a phases and b phases, current loop is as shown in Figure 1.When upper and lower two sets of rectifier trigger pulse time is not exclusively synchronous, current loop P-a1-a-a2-N-P can be formed.Such current loop is there is also between a phases and c phases, b phases and c phases.
Generally using space vector pulse width modulation SVPWM（Space Vector Pulse Width
Modulation）To control the operation of power device in three-phase rectifier system in parallel.While zero sequence dutycycle is changed, the control targes such as output voltage and alternating current must be kept unaffected.
The bridge arm dutycycle waveform that different modulating mode is produced is different, and this is caused by the difference of zero vector distribution.But the alternate dutycycle produced under different modulating mode is identical, the distribution of this explanation zero vector does not influence control targe, but can influence zero sequence dutycycle.Based on this, under seven segmentation SVM modulation systems, a variable k can be introduced to change the distribution of zero vector, the purpose of circulation is suppressed so as to reach.
In Fig. 2, in two three-phase rectifier parallel systems, after zero-sequence current being detected by current sensor, through ovennodulation, the k values that can be needed, by the value of pi regulator real-time regulation k, the action of two rectifier switches is consistent in can making parallel rectifier group, so that zero-sequence current is effectively suppressed.When k change zero vector dutycycles are introduced, first have to be calculated by SVPWM modulation algorithms action time T0, T1, T2 of zero vector and effective vector, the action time KT0 of V7 (111) is obtained by T0, then each sector pulse switching instant is calculated, control pulse occurs corresponding saltus step at these moment.
Claims (4)
1. a kind of circulation inhibition method of three-phase rectifier, it is characterised in that：Including common DC bus three-phase rectifier, zero vector control, three parts of space vector pulse width modulation.
2. the circulation inhibition method of three-phase rectifier as claimed in claim 1, it is characterised in that the common DC bus three-phase rectifier is made up of two three-phase rectifiers, and they share a dc bus.
3. the circulation inhibition method of three-phase rectifier as claimed in claim 1, it is characterised in that the zero vector control introduces a variable k to change the distribution of zero vector under seven segmentation SVPWM modulation systems.
4. the circulation inhibition method of three-phase rectifier as claimed in claim 1, it is characterised in that the space vector pulse width modulation uses seven segmentation SVPWM modulation systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510913157.8A CN106877693A (en) | 2015-12-11 | 2015-12-11 | A kind of circulation inhibition method of three-phase rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510913157.8A CN106877693A (en) | 2015-12-11 | 2015-12-11 | A kind of circulation inhibition method of three-phase rectifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106877693A true CN106877693A (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510913157.8A Pending CN106877693A (en) | 2015-12-11 | 2015-12-11 | A kind of circulation inhibition method of three-phase rectifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258926A (en) * | 2018-01-22 | 2018-07-06 | 南通大学 | A kind of PWM rectifier model predictive control method in parallel of meter and loop current suppression |
| CN108512248A (en) * | 2018-04-17 | 2018-09-07 | 湖南大学 | A kind of method for generating circulation in inhibition rail traffic between energy regenerating current transformer |
-
2015
- 2015-12-11 CN CN201510913157.8A patent/CN106877693A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258926A (en) * | 2018-01-22 | 2018-07-06 | 南通大学 | A kind of PWM rectifier model predictive control method in parallel of meter and loop current suppression |
| CN108512248A (en) * | 2018-04-17 | 2018-09-07 | 湖南大学 | A kind of method for generating circulation in inhibition rail traffic between energy regenerating current transformer |
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| PB01 | Publication | ||
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Application publication date: 20170620 |