CN105048828A - Three-phase current-type PWM rectifier active damping control method - Google Patents
Three-phase current-type PWM rectifier active damping control method Download PDFInfo
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- CN105048828A CN105048828A CN201510392378.5A CN201510392378A CN105048828A CN 105048828 A CN105048828 A CN 105048828A CN 201510392378 A CN201510392378 A CN 201510392378A CN 105048828 A CN105048828 A CN 105048828A
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Abstract
The invention discloses a three-phase current-type PWM rectifier active damping control method. Aimed at a resonance problem introduced by an LC filter, an active damping control method is provided based on a direct current control method. Through control of a grid side current, an active damping three-phase modulation signal is obtained, and the active damping three-phase modulation signal and an original modulation signal are added to obtain a final modulation signal. Through an SPWM and two-three-valued logic conversion, a switch function is obtained and therefore a switch tube is driven. The method is an active damping control method, and a damping resistor is not needed. Direct control of the grid-side current is carried out, addition of extra sensor is not needed, on the basic that the resonance problem introduced by an LC filter is inhibited effectively, the efficiency of the system is raised and the cost of the system is lowered.
Description
Technical field
The present invention relates to Technique of Three-phase Current Source Rectifier control field, particularly relate to a kind of Technique of Three-phase Current Source Rectifier active damping control method.
Background technology
Rectifier occupies very large proportion in power electronic equipment, along with Technique of Three-phase Current Source Rectifier research deeply, instead of voltage type PWM rectifier in some occasion, such as the field such as heart prime, grid-connected power generation system in the data.There are resonance spikes question marks seemingly with the net side LCL filter of voltage type PWM rectifier, there is resonance spikes problem equally in the LC mode filter that Technique of Three-phase Current Source Rectifier net side adopts, thus the stability of influential system, and current on line side sine degree is impacted.
Traditional solution adopts passive damping method, namely on net side filter inductance serial connection or and connecting resistance, and on the filter capacitor of net side serial connection or and connecting resistance.But the method can cause extra power loss, reduce the efficiency of converter.
Summary of the invention
Technical problem to be solved by this invention is for defect involved in background technology, a kind of Technique of Three-phase Current Source Rectifier active damping control method is provided, do not need to increase actual damping resistance or extra transducer, can suppress the resonance problems that LC filter is introduced well yet.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of Technique of Three-phase Current Source Rectifier active damping control method, comprises following steps:
Step 1), obtain the phase place of three alternating voltages in input voltage respectively;
Step 2), PI control is carried out to the DC side given value of current value of Technique of Three-phase Current Source Rectifier and the difference of DC side current actual value, obtains current on line side peak value;
Step 3), by current on line side peak value respectively with step 1) in the phase multiplication of three alternating voltages that obtains, obtain the current on line side set-point i of Technique of Three-phase Current Source Rectifier
a *, i
b *, i
c *;
Step 4), to the current on line side set-point i of Technique of Three-phase Current Source Rectifier
a *, i
b *, i
c *with actual current on line side i
a, i
b, i
cdifference DELTA i
a, Δ i
b, Δ i
ccarry out PI control, obtain initial three-phase modulations signal S
ma1, S
mb1, S
mc1;
Step 5), by actual current on line side i
a, i
b, i
ccarry out controlling calculation according to following formula, obtain active damping three-phase modulations signal S
ma2, S
mb2, S
mc2:
Wherein, R
dfor the resistance of active damping resistance, L is the inductance inductance value of Technique of Three-phase Current Source Rectifier net side LC filter, and s=jw, j are imaginary part unit symbols, and w is the angular frequency of input voltage;
Step 6), by initial three-phase modulations signal S
ma1, S
mb1, S
mc1add active damping three-phase modulations signal S respectively
ma2, S
mb2, S
mc2, obtain final modulation signal S
ma, S
mb, S
mc;
Step 7), SPWM modulation is carried out to final modulation signal, obtains binary switch function p
a, p
b, p
c;
Step 8), two three-valued logic conversions are carried out to binary switch function, obtains three value switch function σ
a, σ
b, σ
c;
Step 9), drive each switching tube of Technique of Three-phase Current Source Rectifier to open shutoff according to this three values switch function.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
The Technique of Three-phase Current Source Rectifier that the present invention is directed to the side filtering of LC net proposes a kind of control method of active damping, and the basis of Direct Current Control method adds active damping control module.First this control method is that a kind of active damping controls, and without the need to adding damping resistance, secondly this control module controls using current on line side as feedback quantity, without the need to extra transducer and sample circuit.Therefore the present invention can effectively suppress to net on the basis of side LC filter resonance problem, does not need to increase actual damping resistance and extra transducer, makes the efficiency of system and cost can obtain improvement to a certain extent.
Accompanying drawing explanation
Fig. 1 is the control schematic diagram of Technique of Three-phase Current Source Rectifier active damping control method in the present invention;
Fig. 2 adds the simulation waveform figure that active damping controls front A phase current on line side;
Fig. 3 adds the simulation waveform figure that active damping controls rear A phase current on line side;
Fig. 4 adds the simulation result figure that active damping controls front A phase current on line side harmonic analysis;
Fig. 5 adds the simulation result figure that active damping controls rear A phase current on line side harmonic analysis.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The invention discloses a kind of Technique of Three-phase Current Source Rectifier active damping control method, Fig. 1 is control schematic diagram of the present invention, netting the power circuit portion of the Technique of Three-phase Current Source Rectifier of side filtering above dotted line for LC, is then the control block diagram of active damping control method below dotted line.
Power circuit portion is made up of LC filter, threephase switch tube module and DC load.First electrical network is connected to LC filter and is connected to threephase switch tube module by the LC filter other end, and threephase switch tube module is connected with DC load again, thus constitutes the power circuit of a complete LC type filtering Technique of Three-phase Current Source Rectifier.
Active damping control method comprises following steps:
Step 1), obtain three alternating voltage V in input voltage respectively
a, V
b, V
cphase place sin (ω t+2j π/3) (j=0,1,2), this step is realized by PLL phase-locked loop module.
Step 2), to the DC side given value of current value I of Technique of Three-phase Current Source Rectifier
dcrefwith DC side current actual value I
dcdifference DELTA I
dc=I
dcref-I
dccarry out PI control, make I
dcfollow the tracks of I
dcref, and obtain current on line side peak value instruction I
sm.
Step 3), by current on line side peak value instruction I
smrespectively with line voltage V
a, V
b, V
cphase place sin (ω t+2j π/3) (j=0,1,2) be multiplied and obtain current on line side set-point i
a *, i
b *, i
c *.
Step 4), according to current on line side set-point i
a *, i
b *, i
c *with actual current on line side i
a, i
b, i
cdifference DELTA i
a=i
a *-i
a, Δ i
b=i
b *-i
b, Δ i
c=i
c *-i
ccarry out PI control, make actual current on line side i
a, i
b, i
ctracking network side given value of current value i
a *, i
b *, i
c *, and obtain initial three-phase modulations signal S
ma1, S
mb1, S
mc1.
Step 5), by actual current on line side i
a, i
b, i
ccarry out controlling calculation according to following formula, obtain active damping three-phase modulations signal S
ma2, S
mb2, S
mc2:
Wherein, R
dfor the resistance of active damping resistance, L is the inductance inductance value of Technique of Three-phase Current Source Rectifier net side LC filter, and s=jw, j are imaginary part unit symbols, and w is the angular frequency of input voltage;
Step 6), by initial three-phase modulations signal S
ma1, S
mb1, S
mc1add active damping three-phase modulations signal S respectively
ma2, S
mb2, S
mc2, obtain final modulation signal S
ma, S
mb, S
mc;
Step 7), SPWM modulation is carried out to final modulation signal, obtains binary switch function p
a, p
b, p
c;
Step 8), two three-valued logic conversions are carried out to binary switch function, obtains three value switch function σ
a, σ
b, σ
c;
Step 9), drive each switching tube of Technique of Three-phase Current Source Rectifier to open shutoff according to this three values switch function.
Control method of the present invention belongs to a kind of novel active damping control mode, and without the need to adding damping resistance, the caloric value solving the introducing of passive damping method is large, the problem that efficiency reduces.In addition, this control method, without the need to introducing extra voltage or current sensor, can reduce costs.
Fig. 2, Fig. 3 add the simulation waveform figure that active damping controls front and back A phase current on line side.
When as can be seen from Figure 2 not adding active damping control, A phase current on line side sine degree is poor.Similar with A, B phase and C phase current on line side sine degree also not ideal enough.
As can be seen from Figure 3, after adding active damping control, A phase current on line side sine degree is better.Similar with A, B phase and C phase current on line side sine degree also ideal.
Fig. 4, Fig. 5 add the simulation result figure that active damping controls front and back A phase current on line side harmonic analysis.
As can be seen from Figure 4 do not add active damping when controlling, the total harmonic content of A phase current on line side reaches 4.22%, wherein nets LC filter resonance frequency place, side harmonic content and reaches 2.6%, similar with A, B phase and C phase current on line side harmonic content also higher.
As can be seen from Figure 5 after adding active damping control, the total harmonic content of A phase current on line side is only 2.82%, and be only 0.4% in net LC filter resonance frequency place, side harmonic content, similar with A, B phase and C phase current on line side harmonic content obtain obvious improvement.
Can be found out by Fig. 2 to Fig. 5, after adding active damping control, current on line side sine degree obtains larger improvement, and net side LC filter resonance problem obtains good suppression.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a Technique of Three-phase Current Source Rectifier active damping control method, is characterized in that, comprises following steps:
Step 1), obtain the phase place of three alternating voltages in input voltage respectively;
Step 2), PI control is carried out to the DC side given value of current value of Technique of Three-phase Current Source Rectifier and the difference of DC side current actual value, obtains current on line side peak value;
Step 3), by current on line side peak value respectively with step 1) in the phase multiplication of three alternating voltages that obtains, obtain the current on line side set-point i of Technique of Three-phase Current Source Rectifier
a *, i
b *, i
c *;
Step 4), to the current on line side set-point i of Technique of Three-phase Current Source Rectifier
a *, i
b *, i
c *with actual current on line side i
a, i
b, i
cdifference DELTA i
a, Δ i
b, Δ i
ccarry out PI control, obtain initial three-phase modulations signal S
ma1, S
mb1, S
mc1;
Step 5), by actual current on line side i
a, i
b, i
ccarry out controlling calculation according to following formula, obtain active damping three-phase modulations signal S
ma2, S
mb2, S
mc2:
Wherein, R
dfor the resistance of active damping resistance, L is the inductance inductance value of Technique of Three-phase Current Source Rectifier net side LC filter, and s=jw, j are imaginary part unit symbols, and w is the angular frequency of input voltage;
Step 6), by initial three-phase modulations signal S
ma1, S
mb1, S
mc1add active damping three-phase modulations signal S respectively
ma2, S
mb2, S
mc2, obtain final modulation signal S
ma, S
mb, S
mc;
Step 7), SPWM modulation is carried out to final modulation signal, obtains binary switch function p
a, p
b, p
c;
Step 8), two three-valued logic conversions are carried out to binary switch function, obtains three value switch function σ
a, σ
b, σ
c;
Step 9), drive each switching tube of Technique of Three-phase Current Source Rectifier to open shutoff according to this three values switch function.
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| CN201510392378.5A CN105048828A (en) | 2015-07-06 | 2015-07-06 | Three-phase current-type PWM rectifier active damping control method |
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| CN105048828A true CN105048828A (en) | 2015-11-11 |
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Citations (5)
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|---|---|---|---|---|
| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN102290820A (en) * | 2011-08-22 | 2011-12-21 | 中国矿业大学 | LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side |
| CN103078526A (en) * | 2013-01-08 | 2013-05-01 | 广东志成冠军集团有限公司 | Current source type rectifier and grid-connected control method based on virtual resistor |
| CN103248259A (en) * | 2013-04-16 | 2013-08-14 | 湖南大学 | Single-current feedback control method of three-phase LCL (lower control limit) filtering type PWM (pulse-width modulation) rectifier |
| CN104113218A (en) * | 2014-06-05 | 2014-10-22 | 南京航空航天大学 | Matrix converter comprising source damping filtering unit, and control method thereof |
-
2015
- 2015-07-06 CN CN201510392378.5A patent/CN105048828A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN102290820A (en) * | 2011-08-22 | 2011-12-21 | 中国矿业大学 | LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on feedback variable current side |
| CN103078526A (en) * | 2013-01-08 | 2013-05-01 | 广东志成冠军集团有限公司 | Current source type rectifier and grid-connected control method based on virtual resistor |
| CN103248259A (en) * | 2013-04-16 | 2013-08-14 | 湖南大学 | Single-current feedback control method of three-phase LCL (lower control limit) filtering type PWM (pulse-width modulation) rectifier |
| CN104113218A (en) * | 2014-06-05 | 2014-10-22 | 南京航空航天大学 | Matrix converter comprising source damping filtering unit, and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 文教普: ""三相电流型 PWM 整流器的研究与实现"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20151111 |