CN102005948A - Method for correcting and rectifying three-phase active power factors - Google Patents

Method for correcting and rectifying three-phase active power factors Download PDF

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CN102005948A
CN102005948A CN2010105614919A CN201010561491A CN102005948A CN 102005948 A CN102005948 A CN 102005948A CN 2010105614919 A CN2010105614919 A CN 2010105614919A CN 201010561491 A CN201010561491 A CN 201010561491A CN 102005948 A CN102005948 A CN 102005948A
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load
phase
duty ratio
control
bus
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CN102005948B (en
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丁坤
姚河清
傅强
史中权
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Changzhou Campus of Hohai University
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Abstract

The invention relates to a method for correcting and rectifying three-phase active power factors, comprising the steps of: providing a load observer by combining the periodic change characteristic of a load according to the design idea of interference observation so as to observe the load at the direct-current bus side to obtain the equivalent resistance at the alternating-current side of each phase; carrying out moving average on the observed load according to the change period of the load to obtain a steady load average equivalent estimate in the change period; and realizing steady distortionless input current according to the average equivalent estimate and by matching a duty ratio processing method of the invention. The method for correcting and rectifying the three-phase active power factors is suitable for the digital control of the periodic (frequency is more than 5Hz) change of the load at the direct-current bus side.

Description

A kind of three-phase active power factor is proofreaied and correct method for rectifying
Technical field
The present invention relates to the method that a kind of three-phase active power factor is proofreaied and correct, reduced the three-phase input current harmonic wave, specifically is a kind of method of Active Power Factor Correction when being implemented in rectification output dc bus lateral load cyclic variation, belongs to electrical technology field.
Background technology
At present, during general three-phase active power factor corrective rectifier design with a kind of load of dc bus outlet side the state when constant analyze, the main purpose of control method is guaranteed the constant of dc bus output voltage.This method at first detects the voltage of dc bus outlet side, output voltage with this voltage and expectation compares then, the departure input three-phase active power factor that obtains is proofreaied and correct in the rectification control system, last control system is carried out the duty ratio of the pwm signal of control main circuit power pipe after the integrated treatment according to this signal and detected three-phase input voltage and current signal, reduce input current harmonics thereby realize improving input power factor, control output voltage is constant simultaneously.When adopting the control method of this routine to control, when load changing input current waveform and output voltage can both regulate automatically and response speed fast, the Voltage Stability Control of output dc bus is effective.But when the control method of this routine is applied to the dc bus load and is periodically variable rectifier, because the cyclic variation of load causes the cyclic variation of output busbar voltage, make control system periodically adjust, although final dc bus output voltage is constant, but owing to the periodicity adjustment to input current causes the input current waveform distortion serious, also can cause every phase input current imbalance, every phase input current has the DC component of existence, and when the load variations cycle is any period input current also can exist serious between harmonic components, these all can severe exacerbation to the harm of electrical network.
Summary of the invention
The invention provides a kind of three-phase active power factor digital control, that control is effective that is suitable for dc bus lateral load periodicity (frequency is greater than 5Hz) variation and proofread and correct method for rectifying.
The present invention realizes that the technical scheme of above-mentioned purpose is, a kind of three-phase active power factor at the cyclic variation load is proofreaied and correct method for rectifying, its innovative point is: adopt the control system of this method that two control loops are arranged, control loop A adopts the PI control method to control; Control loop B adopts the load observer to control, and the step of specific implementation is as follows:
1) control system starts, and selector switch K inserts duty ratio 1;
2) control system is to the output DC bus-bar voltage of main circuit With input biphase current i a, i bSample, adopt the PI control method to calculate three-phase duty ratio D(D a, D b, D c);
3) the load observer is according to DC bus-bar voltage With input biphase current i a, i bAnd the three-phase duty ratio D(D of current output a, D b, D c) observe the measured value of three-phase equivalent load;
4) the three-phase equivalent load that the load observer is observed is carried out moving average according to the period of change of load;
5) handle according to the three-phase equivalent load after the moving average, calculate three-phase duty ratio D(D a, D b, D c);
6) when the load variations week after date of control system startup above 1.5 times, selector switch K inserts duty ratio 2.
The method of the measured value of the observer of load described in the step 3 observation three-phase equivalent load is:
The load observer is by the duty ratio D(D to the current PWM control cycle of three-phase a, D b, D c), DC bus-bar voltage U DcWith input biphase current i a, i bCarry out integrated treatment and obtain the measured value of three-phase equivalent load, the step of specific implementation is as follows:
1) at the center time point in each PWM cycle sampling DC bus-bar voltage U DcAnd the biphase current i of input aAnd i b, and preserve corresponding output duty cycle D(D of this PWM cycle three a, D b, D c);
2) use following formula and calculate the three-phase equivalent load:
Figure 175972DEST_PATH_IMAGE003
In the formula: j=a, b, c,
Figure 970753DEST_PATH_IMAGE004
Be the equivalent load of j n PWM cycle,
Figure 350525DEST_PATH_IMAGE005
Be the j duty ratio in n PWM cycle of phase,
Figure 126720DEST_PATH_IMAGE006
The dc bus output voltage of n PWM during the cycle,
Figure 109720DEST_PATH_IMAGE007
The input current that samples at n PWM cycle mid point for j, wherein
Figure 193344DEST_PATH_IMAGE008
Described in the step 5 according to obtaining three-phase duty ratio D(D after the equivalent load moving average a, D b, D c) processing method, the step of specific implementation is as follows:
1) control system is obtained current PWM cycle three-phase equivalent load sliding average
Figure 866771DEST_PATH_IMAGE009
, DC bus-bar voltage U DcAnd input biphase current i aAnd i b
2) use following formula and carry out the duty ratio processing, calculate the duty ratio of the next PWM control cycle of three-phase :
Figure 680953DEST_PATH_IMAGE011
In the formula:
J=a, b, c,
Figure 817536DEST_PATH_IMAGE012
Desired output the dc bus output voltage.
The present invention is based on the interference observer principle, utilize that interference observer can some can all be estimated as disturbance of equal value to the factor that system's control exerts an influence with the disturbance of system, inertia etc., thus the elimination of realization system control disturbance.Design philosophy according to disturbance-observer, characteristics in conjunction with the cyclic variation load, a kind of load observer has been proposed, in real time the load of dc bus side is observed, obtain the equivalent resistance of the AC side of every phase, period of change according to load carries out moving average to the load that observes again, can obtain the load average equivalence estimated value of a period of change homeostasis, the duty ratio processing method that cooperates the present invention to propose according to this average equivalent estimated value can realize stable almost distortionless input current again.
The present invention adopts DSP as the control core, three-phase three switch three lever circuit are as main circuit topology, according to the every phase input current that samples, actual output dc voltage, desired output direct voltage, go out the duty ratio of three bidirectional switch PWM of next PWM control cycle by the derivation of equation, even when the duty cycle property variation of dc bus side, also can realize proofreading and correct rectification near the three-phase active power factor of unity power factor.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention;
Fig. 2 is the control principle block diagram of control method of the present invention;
Fig. 3 adopts conventional control method A, B two-phase input current waveform figure during for 50Hz for load variations;
Fig. 4 adopts control method A of the present invention, B two-phase input current waveform figure during for 50Hz for load variations.
[wherein, among Fig. 1,
Figure 407786DEST_PATH_IMAGE013
Figure 292828DEST_PATH_IMAGE014
Be the input three phase mains,
Figure 908803DEST_PATH_IMAGE016
Figure 485201DEST_PATH_IMAGE018
Be that three input power factors are proofreaied and correct the PFC inductance,
Figure 585881DEST_PATH_IMAGE019
Figure 64267DEST_PATH_IMAGE020
Figure 396154DEST_PATH_IMAGE021
Be three two-way power switch,
Figure 793637DEST_PATH_IMAGE022
~ Be 6 rectifier diodes,
Figure 598443DEST_PATH_IMAGE024
Figure 719590DEST_PATH_IMAGE025
Be output filter capacitor,
Figure 350291DEST_PATH_IMAGE002
Be the voltage of detected output dc bus; Among Fig. 2, Udc is the output voltage of dc bus, and ia, ib are the input currents of A, B two-phase, and D is an output duty cycle, and K is the control selector switch].
Embodiment
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail.
A kind of three-phase active power factor at the cyclic variation load is proofreaied and correct method for rectifying, adopts the control system of this method that two control loops are arranged, and control loop A adopts the PI control method to control; Control loop B adopts the load observer to control, and the step of specific implementation is as follows:
1) control system starts, and selector switch K inserts duty ratio 1;
2) control system is to the output DC bus-bar voltage of main circuit
Figure 192607DEST_PATH_IMAGE001
With input biphase current i a, i bSample, adopt the PI control method to calculate three-phase duty ratio D(D a, D b, D c);
3) the load observer is according to DC bus-bar voltage
Figure 262064DEST_PATH_IMAGE002
With input biphase current i a, i bAnd the three-phase duty ratio D(D of current output a, D b, D c) observe the measured value of three-phase equivalent load;
4) the three-phase equivalent load that the load observer is observed is carried out moving average according to the period of change of load;
5) handle according to the three-phase equivalent load after the moving average, calculate three-phase duty ratio D(D a, D b, D c);
6) when the load variations week after date of control system startup above 1.5 times, selector switch K inserts duty ratio 2.
Above-mentioned 6 steps can realize three-phase active power factor correction rectification.
The method of the measured value of the observer of load described in the step 3 observation three-phase equivalent load is:
The load observer is by the duty ratio D(D to the current PWM control cycle of three-phase a, D b, D c), DC bus-bar voltage U DcWith input biphase current i a, i bCarry out integrated treatment and obtain the measured value of three-phase equivalent load, the step of specific implementation is as follows:
1) at the center time point in each PWM cycle sampling DC bus-bar voltage U DcAnd the biphase current i of input aAnd i b, and preserve corresponding output duty cycle D(D of this PWM cycle three a, D b, D c);
2) use following formula and calculate the three-phase equivalent load:
Figure 552231DEST_PATH_IMAGE003
In the formula: j=a, b, c, Be the equivalent load of j n PWM cycle,
Figure 742833DEST_PATH_IMAGE005
Be the j duty ratio in n PWM cycle of phase,
Figure 101133DEST_PATH_IMAGE006
The dc bus output voltage of n PWM during the cycle, The input current that samples at n PWM cycle mid point for j, wherein
Figure 47672DEST_PATH_IMAGE008
Figure 97536DEST_PATH_IMAGE004
Be the three-phase equivalent load of trying to achieve.
Described in the step 5 according to obtaining three-phase duty ratio D(D after the equivalent load moving average a, D b, D c) processing method, the step of specific implementation is as follows:
1) control system is obtained current PWM cycle three-phase equivalent load sliding average
Figure 7330DEST_PATH_IMAGE009
, DC bus-bar voltage U DcAnd input biphase current i aAnd i b
2) use following formula and carry out the duty ratio processing, calculate the duty ratio of the next PWM control cycle of three-phase :
Figure 681074DEST_PATH_IMAGE011
In the formula:
J=a, b, c,
Figure 782016DEST_PATH_IMAGE012
Desired output the dc bus output voltage.
Tried to achieve
Figure 482119DEST_PATH_IMAGE010
Just be described according to acquisition three-phase duty ratio D(Da after the equivalent load moving average, Db, Dc).
The rectifier of Fig. 1 have 6 rectifier diodes ( ~
Figure 929073DEST_PATH_IMAGE023
) main circuit by three input PFC inductance (
Figure 641484DEST_PATH_IMAGE018
) access three-phase input power supply (
Figure 392271DEST_PATH_IMAGE013
Figure 527193DEST_PATH_IMAGE014
Figure 257514DEST_PATH_IMAGE015
), one end common point of three two-way power switch (Ka Kb Kc) inserts two output capacitance (C1, C2) mid point, DSP control system input pwm signal three two-way power switch (Ka, Kb, Kc) in the control main circuit after drive circuit drives.
Fig. 2 is a control block diagram of the present invention, and control system has two control loops, and a loop is the output DC bus-bar voltage of sampling main circuit
Figure 538322DEST_PATH_IMAGE027
With the input biphase current , adopt the conventional control method of document 1 to control according to these two kinds of signals, produce duty cycle signals 1; Another loop is that the load observer is according to DC bus-bar voltage
Figure 754333DEST_PATH_IMAGE002
With the input biphase current
Figure 553924DEST_PATH_IMAGE029
And output duty cycle D observes the estimated value of the equivalent load of every phase, obtain duty cycle signals 2 after this estimated value moving average being handled by duty ratio afterwards, system selects duty cycle signals to insert main circuit generation pwm signal through duty ratio selector switch K according to different situations and controls three bidirectional switchs again.
Adopt conventional control method A, B two-phase input current waveform figure during for 50Hz for load variations as Fig. 3, Fig. 4 adopts control method A of the present invention, B two-phase input current waveform figure during for 50Hz for load variations.As seen control method of the present invention has obtained good effect.

Claims (3)

1. the three-phase active power factor at the cyclic variation load is proofreaied and correct method for rectifying, it is characterized in that: adopt the control system of this method that two control loops are arranged, control loop A adopts the PI control method to control; Control loop B adopts the load observer to control, and the step of specific implementation is as follows:
1) control system starts, and selector switch K inserts duty ratio 1;
2) control system is to the output DC bus-bar voltage of main circuit
Figure 2010105614919100001DEST_PATH_IMAGE001
With input biphase current i a, i bSample, adopt the PI control method to calculate three-phase duty ratio D(D a, D b, D c);
3) the load observer is according to DC bus-bar voltage With input biphase current i a, i bAnd the three-phase duty ratio D(D of current output a, D b, D c) observe the measured value of three-phase equivalent load;
4) the three-phase equivalent load that the load observer is observed is carried out moving average according to the period of change of load;
5) handle according to the three-phase equivalent load after the moving average, calculate three-phase duty ratio D(D a, D b, D c);
6) when the load variations week after date of control system startup above 1.5 times, selector switch K inserts duty ratio 2.
2. the three-phase active power factor at the cyclic variation load according to claim 1 is proofreaied and correct method for rectifying, it is characterized in that: the method for the measured value of the observer of load described in the step 3 observation three-phase equivalent load is:
The load observer is by the duty ratio D(D to the current PWM control cycle of three-phase a, D b, D c), DC bus-bar voltage U DcWith input biphase current i a, i bCarry out integrated treatment and obtain the measured value of three-phase equivalent load, the step of specific implementation is as follows:
1) at the center time point in each PWM cycle sampling DC bus-bar voltage U DcAnd the biphase current i of input aAnd i b, and preserve corresponding output duty cycle D(D of this PWM cycle three a, D b, D c);
2) use following formula and calculate the three-phase equivalent load:
In the formula: j=a, b, c,
Figure 930892DEST_PATH_IMAGE004
Be the equivalent load of j n PWM cycle,
Figure 2010105614919100001DEST_PATH_IMAGE005
Be the j duty ratio in n PWM cycle of phase,
Figure 151657DEST_PATH_IMAGE006
The dc bus output voltage of n PWM during the cycle, The input current that samples at n PWM cycle mid point for j, wherein
Figure 223781DEST_PATH_IMAGE008
3. the three-phase active power factor at the cyclic variation load according to claim 1 is proofreaied and correct method for rectifying, it is characterized in that: described in the step 5 according to obtaining three-phase duty ratio D(D after the equivalent load moving average a, D b, D c) processing method, the step of specific implementation is as follows:
1) control system is obtained current PWM cycle three-phase equivalent load sliding average
Figure 2010105614919100001DEST_PATH_IMAGE009
, DC bus-bar voltage U DcAnd input biphase current i aAnd i b
2) use following formula and carry out the duty ratio processing, calculate the duty ratio of the next PWM control cycle of three-phase
Figure 125788DEST_PATH_IMAGE010
:
Figure 2010105614919100001DEST_PATH_IMAGE011
In the formula:
J=a, b, c, Desired output the dc bus output voltage.
CN2010105614919A 2010-11-28 2010-11-28 Method for correcting and rectifying three-phase active power factors Expired - Fee Related CN102005948B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104022637A (en) * 2014-06-23 2014-09-03 广东工业大学 Digital control system and method for three-level PFC circuit
CN104079161A (en) * 2014-06-23 2014-10-01 广东工业大学 Digital control system and method of three-phase three-level PFC circuit
WO2022228016A1 (en) * 2021-04-26 2022-11-03 佛山市顺德区美的电子科技有限公司 Electronic device control method and apparatus, electronic device, and computer storage medium, and program
CN117394708A (en) * 2023-12-13 2024-01-12 四川大学 Current-mode PWM rectifier control system and method suitable for input unbalance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1571255A (en) * 2004-04-30 2005-01-26 艾默生网络能源有限公司 Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter
US20060109695A1 (en) * 2004-11-19 2006-05-25 Yuancheng Ren Power converters having capacitor resonant with transformer leakage inductance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1571255A (en) * 2004-04-30 2005-01-26 艾默生网络能源有限公司 Synchronous rectification reverse-flow preventing circuit and method for parallel synchronous rectification converter
US20060109695A1 (en) * 2004-11-19 2006-05-25 Yuancheng Ren Power converters having capacitor resonant with transformer leakage inductance

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104022637A (en) * 2014-06-23 2014-09-03 广东工业大学 Digital control system and method for three-level PFC circuit
CN104079161A (en) * 2014-06-23 2014-10-01 广东工业大学 Digital control system and method of three-phase three-level PFC circuit
CN104079161B (en) * 2014-06-23 2016-07-13 广东工业大学 The numerical control system of three-phase tri-level pfc circuit and control method
WO2022228016A1 (en) * 2021-04-26 2022-11-03 佛山市顺德区美的电子科技有限公司 Electronic device control method and apparatus, electronic device, and computer storage medium, and program
CN117394708A (en) * 2023-12-13 2024-01-12 四川大学 Current-mode PWM rectifier control system and method suitable for input unbalance
CN117394708B (en) * 2023-12-13 2024-02-20 四川大学 Current-mode PWM rectifier control system and method suitable for input unbalance

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