CN101807861B - Method for rectifying three-phase active power factor - Google Patents
Method for rectifying three-phase active power factor Download PDFInfo
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- CN101807861B CN101807861B CN200910232280A CN200910232280A CN101807861B CN 101807861 B CN101807861 B CN 101807861B CN 200910232280 A CN200910232280 A CN 200910232280A CN 200910232280 A CN200910232280 A CN 200910232280A CN 101807861 B CN101807861 B CN 101807861B
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- Prior art keywords
- phase
- power factor
- delta
- control
- input current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a three-phase active power factor rectification method for realizing the three-phase power factor correction and the three-phase input current harmonics reduction, which comprises the following steps: obtaining an input current average value of two-phase in the n-th PWM period; regulating the obtained control parameter via a PI based on the output voltage; calculating the equivalent rated load resistance on each phase AC side, the equivalent rated load resistance on each phase AC side in the rated power and the duty cycles of three bidirectional switches in the next PWM control period, finally outputting three bidirectional switch duty cycle control signals to control three corresponding bidirectional switches by a DSP control system at the beginning of the next PWM control period. The invention adopts a DSP (Digital Signal Processor) as the control core to realize the three-phase active power factor rectification without an input voltage sensor approaching to the unity power factor.
Description
Technical field
The present invention is a kind of method that realizes three-phase activity coefficient adjustment, reduces the three-phase input current harmonic wave, belongs to electrical technology field.
Background technology
At present, general rectifying three-phase active power factor device all need detect input ac voltage, realizes the control to input current waveform through the waveform of following the tracks of input voltage, thereby realizes improving power factor and reduce Harmonics of Input.This method at first detects three-phase input ac voltage signal; With this signal reference signal as input current after nursing one's health; Detect input current then, thereby change the PWM realization raising input power factor reduction input current harmonics of control main circuit power pipe according to the difference of input current and reference signal.This method need be used three voltage sensor senses three-phase input voltages, has increased the control system cost, and simultaneously, the signal errors of three voltage sensors or the interference of conduction pathway all can influence the control effect.In single-phase, rectifying three-phase active power factor device, use monocycle control method and can realize need not input voltage sensor, but all be the method that adopts analog circuit control.Because the method that the analog circuit control method adopts analogue device to build hardware circuit formation control circuit realizes; This circuit is once confirming; Relevant parameter in the control system then can't be regulated; And along with problems such as parameter drift appear in the aging meeting of the element in the control circuit, the control effect of system can be received influence.
Summary of the invention
The present invention proposes a kind of numerically controlled no input voltage sensor, effective method for rectifying three-phase active power factor of control of being suitable for.
The technical scheme that the present invention adopts is: the main circuit with 6 rectifier diodes inserts three-phase input power supply through three input PFC inductance; Three two-way power switch; Three two-way power switch in the main circuit insert the DSP control system by drive circuit, at first obtain n interior input current average value of PWM cycle of two phases; Regulate the Control Parameter that obtains through PI according to output voltage; Calculate the equivalent nominal load resistance of every cross streams side; The equivalent nominal load resistance of every cross streams side when calculating rated power; Calculate the duty ratio of the next PWM control cycle of three bidirectional switchs again, last DSP control system is controlled three corresponding bidirectional switchs with above-mentioned three the bidirectional switch duty cycle control signal outputs that obtain of step when next PWM control cycle begins.
The present invention adopts DSP as the control core; Three-phase three switch three lever circuit are as main circuit topology; According to the AC side equivalent resistance under the input average current that samples, the rated condition, desired output direct voltage, actual output dc voltage; Go out the duty ratio of three bidirectional switch PWM of next PWM control cycle through the derivation of equation, thereby realize no input voltage sensor rectifying three-phase active power factor near unity power factor.
Description of drawings
Fig. 1 is the inventive circuit theory diagram, wherein, and e
ae
be
cBe the input three phase mains, L
aL
bL
cBe that three input power factors are proofreaied and correct PFC inductance, K
aK
bK
cBe three two-way power switch, D
1~D
6Be 6 rectifier diodes, C
1C
2Be output filter capacitor, U
DcBe the voltage of detected output dc bus.
Fig. 2 is the sketch map of certain phase input current.
Fig. 3 is certain biphase current oscillogram.
Embodiment
The rectifier of Fig. 1 has 6 rectifier diode (D
1~D
6) main circuit through three input PFC inductance (L
aL
bL
c) access three-phase input power supply e
a, e
b, e
c, three two-way power switch K
a, K
b, K
cAn end common point insert two output capacitance C
1, C
2Mid point, DSP control system input pwm signal is controlled three two-way power switch K in the main circuit after driving circuit drives
a, K
b, K
c
Like Fig. 1, need be in the circuit to three bidirectional switch K
a, K
b, K
cDuty ratio control, through obtaining three bidirectional switch K to the controlling models analysis
a, K
b, k
cN+1 PWM duty ratio
Concrete steps are following:
1) obtains n interior input current average value of PWM cycle of two phases<i
a>
nWith<i
b>
n
2) according to output voltage U
DcRegulate the Control Parameter K that obtains through PI
UCalculate the equivalent nominal load resistance of every cross streams side
P
ΔRated power for rectifier; The equivalent nominal load resistance R of every cross streams side when calculating rated power
Δ
3) calculate three bidirectional switch K
a, K
b, K
cThe duty ratio D of next PWM control cycle
N+1:
In the formula:
V
ΔBe the VD value of expectation,
4) three bidirectional switch K when next PWM control cycle begins, step 3) being obtained of DSP control system
a, K
b, K
cThree corresponding bidirectional switchs of duty cycle control signal output control.
2, about a, b two preparation method of n PWM input current average value in the cycle mutually:
In analog control circuit, can adopt the method that the electric current in the control cycle is carried out integration to obtain the mean value of a switch control cycle input current; And in digital control if adopt the digital integration method to ask the mean value of input current; Then require the A/D sample frequency far above switch control cycle frequency; This requirement to hardware system is very high, and the present invention proposes the mean value that a kind of cycle synchronisation double sampling method can obtain accurate input current.
Like Fig. 2, n cycle PWM cycle begins to finish i to (n+1) Ts from nTs constantly
LBe that power tube is opened electric current constantly, i
HBe that power tube turn-offs electric current constantly, the mean value that can obtain input current in n cycle is:
For obtaining the mean value of following formula, the step of the concrete method of sampling of cycle synchronisation double sampling method is following:
1) subsequent use sampled point, the mid point that defines the rising of input current like Fig. 2 are that the mid point of M1, decline is that M2 does, these two points are as subsequent use sampled point.
2) confirm sampled point, according to n cycle PWM cycle duty ratio D
nSize is confirmed sampled point, works as D
nConfirmed that M2 was a sampled point at<15% o'clock; As 15%≤D
nConfirmed that M1 and M2 were sampled point at≤85% o'clock; Work as D
nConfirmed that M1 was a sampled point at>85% o'clock.
3) average current calculates, and the electric current that samples according to above-mentioned method is defined as
and
, and can to obtain n cycle PWM cycle average current following:
This processing method is a kind of one-period double sampling method of importing average current, at each once sampling current value of mid point of the rising and the decline of electric current, handles according to the situation of duty ratio again, can largely reduce the interference of power switch pipe switch.
The rectification effect that adopts this method to realize is as shown in Figure 3, is respectively a, the b biphase current oscillogram of model machine rectifier input among Fig. 3, and the effective value of a, b two phases all is 14.5A.
Claims (2)
1. method for rectifying three-phase active power factor, wherein the rectifying three-phase active power factor utensil has 6 rectifier diode (D
1~D
6) and three two-way power switch (K
aK
bK
c) main circuit through three input PFC inductance (L
aL
bL
c) access three-phase input power supply (e
ae
be
c), three two-way power switch (K
aK
bK
c) insert the DSP control system by drive circuit, it is characterized in that adopting following steps:
1) obtains input current average value in n PWM control cycle of two phases<i
a>
nWith<i
b>
n
2) according to output voltage U
DcRegulate controlled parameter K through PI
UCalculate the equivalent nominal load resistance of every cross streams side
P
ΔRated power for the rectifying three-phase active power factor device;
3) calculate three two-way power switch (K
aK
bK
c) the duty ratio D of next PWM control cycle
N+1:
In the formula: V
ΔBe the VD value of expectation,
4) the DSP control system is when next PWM control cycle begins, three two-way power switch (K that step 3) is obtained
aK
bK
c) duty ratio D
N+1Output, three two-way power switch that control is corresponding.
2. a kind of method for rectifying three-phase active power factor according to claim 1 is characterized in that: input current average value in n PWM control cycle of two phases<i
a>
nWith<i
b>
nPreparation method be:
1) mid point of the rising of definition input current is that the mid point of M1, decline is that M2 is as subsequent use sampled point;
2) according to n PWM control cycle duty ratio D
nSize is confirmed sampled point, works as D
nConfirmed that M2 was a sampled point at<15% o'clock; As 15%≤D
nConfirmed that M1 and M2 were sampled point at≤85% o'clock; Work as D
nConfirmed that M1 was a sampled point at>85% o'clock;
3) calculate input current average value:
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CN200910232280A CN101807861B (en) | 2009-12-10 | 2009-12-10 | Method for rectifying three-phase active power factor |
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CN200910232280A CN101807861B (en) | 2009-12-10 | 2009-12-10 | Method for rectifying three-phase active power factor |
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CN101807861A CN101807861A (en) | 2010-08-18 |
CN101807861B true CN101807861B (en) | 2012-08-29 |
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CN110336458B (en) * | 2019-05-10 | 2020-05-26 | 珠海格力电器股份有限公司 | Harmonic suppression circuit, power supply with same and air conditioner |
CN111130333B (en) * | 2019-12-24 | 2023-03-21 | 广东希塔变频技术有限公司 | Control method, control device, PFC circuit, motor driving device and air conditioner |
CN111030442B (en) * | 2020-01-27 | 2023-02-28 | 广东希塔变频技术有限公司 | Control method, control device, PFC circuit, motor driving device and air conditioner |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6137700A (en) * | 1997-10-08 | 2000-10-24 | Daikin Industries, Ltd. | Converter with a high power factor using a DC center point voltage |
US6757185B2 (en) * | 1999-12-22 | 2004-06-29 | E.E.S. Sistemas De Energia Ltda. | Method and control circuitry for a three-phase three-level boost-type rectifier |
CN1610230A (en) * | 2004-11-05 | 2005-04-27 | 北京工业大学 | Three-phase power factor correcting circuit with AC boosting mode |
CN101039079A (en) * | 2006-03-14 | 2007-09-19 | Lg电子株式会社 | Apparatus and method for supplying DC power source |
-
2009
- 2009-12-10 CN CN200910232280A patent/CN101807861B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6137700A (en) * | 1997-10-08 | 2000-10-24 | Daikin Industries, Ltd. | Converter with a high power factor using a DC center point voltage |
US6757185B2 (en) * | 1999-12-22 | 2004-06-29 | E.E.S. Sistemas De Energia Ltda. | Method and control circuitry for a three-phase three-level boost-type rectifier |
CN1610230A (en) * | 2004-11-05 | 2005-04-27 | 北京工业大学 | Three-phase power factor correcting circuit with AC boosting mode |
CN101039079A (en) * | 2006-03-14 | 2007-09-19 | Lg电子株式会社 | Apparatus and method for supplying DC power source |
Non-Patent Citations (1)
Title |
---|
张厚升等.《基于单周期控制的通用三相PFC控制器的研究》.《电工技术学报》.2004,第19卷(第9期),73-76页. * |
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