CN102437576A - Active power filter (APF) controller and control method thereof - Google Patents
Active power filter (APF) controller and control method thereof Download PDFInfo
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- CN102437576A CN102437576A CN2011104288692A CN201110428869A CN102437576A CN 102437576 A CN102437576 A CN 102437576A CN 2011104288692 A CN2011104288692 A CN 2011104288692A CN 201110428869 A CN201110428869 A CN 201110428869A CN 102437576 A CN102437576 A CN 102437576A
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- 238000004891 communication Methods 0.000 claims description 10
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses an active power filter (APF) controller and a control method thereof. The APF controller is designed based on an undistorted detection method and can realize control on the APF so as to deal with the power quality problems such as harmonic wave, reactive power and three-phase unbalance in an electric power system. The APF controller and the control method thereof have the following advantages and positive effects: 1. by adopting an improved current detection method with good stability, interference can be avoided and the compensation effect can be improved; 2. on the basis of a perfect circuit of the APF controller, the deigned control algorithm runs on the controller made according to the circuit, which can realize effective control of the APF so as to reach good harmonic suppression effect and can also realize functions of reactive power compensation, three-phase load balance and the like; and 3. the controller has fast response speed and can perform tracking compensation in response to load change within 80 microseconds.
Description
Technical field
The present invention relates to the electric filtering field, relate in particular to a kind of controller and control method thereof of Active Power Filter-APF.
Background technology
Along with development of science and technology, power quality problem such as harmonic wave, idle, three-phase imbalance more and more receives the attention of work about electric power person and entire society.Reactive power compensator in the past is main with shunt capacitor, and harmonic treating apparatus is main with passive filter.They can bring into play corresponding effect in specific occasions, but also have the shortcoming of the following aspects: 1, the shunt capacitor compensating reactive power only is applicable to the occasion of inductive load, can not compensate for capacitive load; 2, it is idle that shunt capacitor can only have differential generation, can not realize the reactive power of Continuous Compensation electrical network; 3, shunt capacitor can not compensation harmonic, also possibly cause electric power system resonance, and passive filter can the offset current harmonic wave, but unreasonable allocation also can cause electric power system resonance; 4, the active power that shunt capacitor and passive filter all can not the balance three-phase loads.
The Active Power Filter-APF of sampling modern power electronics technology exploitation is the filtering current harmonics effectively; Simultaneously can also compensating power and balance three-phase load; And Active Power Filter-APF has really been realized the Continuous Compensation and the dynamic tracking compensation of stepless difference; Response speed is fast, and the response time is about 100 microseconds.Active Power Filter-APF is the advanced method of power quality controlling.
In the control algolithm of Active Power Filter-APF, extraction harmonic wave, detection technology idle, unbalanced component are one of key technologies of control algolithm.If detection process generation distortion, then control system can be given the control command that makes mistake, the compensation effect that does not reach.Present control algolithm; Detection distortion often takes place under the situation of system voltage distortion; And owing to receive the restriction of Active Power Filter-APF self control frequency, Active Power Filter-APF can not the good treatment high-frequency signal; If therefore in control algolithm, can not remove high-frequency signal, then high-frequency signal also can influence the control effect.
Summary of the invention
Technical problem to be solved by this invention is the problem that exists in the detection technology to the existing control algolithm of Active Power Filter-APF; A kind of controller and control method thereof of Active Power Filter-APF are provided; Through a kind of distortionless demodulation method; And design the controller of Active Power Filter-APF, be used to realize control, thereby realize improvement the power quality problem of harmonic wave in the electric power system, idle, three-phase imbalance to Active Power Filter-APF.
For solving the problems of the technologies described above; Technical scheme of the present invention is a kind of controller of Active Power Filter-APF; It is characterized in that; It comprises the voltage to electrical network, voltage, current signal Acquisition Circuit and the anti-interference filtration circuit that the electric current electric weight measures; The A/D converter ic chip that input links to each other with the anti-interference filtration circuit output end, core calculations that input links to each other with A/D converter ic chip output and control chip DSP digital signal processor, the input/output interface circuit, drive signal control transformation circuit and the double port memory RAM chip that link to each other with this DSP digital signal processor output successively; The central processing element that is used for the communication miscellaneous function that links to each other with double port memory RAM chip output, and the communication interface circuit that links to each other with this auxiliary centre process chip output.
Described DSP digital signal processor model is TMS320F2812.
Described input/output interface circuit, drive signal control transformation circuit have all adopted photoelectricity coupling buffer circuit.
Described auxiliary centre process chip adopts single-chip microcomputer or adopts the DSP digital signal processor.
A kind of controller control method of Active Power Filter-APF is characterized in that, storage control program in the described DSP digital signal processor, and described method comprises the following steps;
A) utilize the controller of Active Power Filter-APF to gather the system voltage signal u of gained
Sa, u
Sb, u
ScWith load current signal i
La, i
Lb, i
LcCalculate the total active power P of three-phase of load, phase voltage effective value U
s, utilize the controller of Active Power Filter-APF to gather the DC bus-bar voltage signal U of gained
DcCalculate DC bus-bar voltage deviation signal Δ U
Dc, and then proportion of utilization-integral element calculates and Δ U
DcCorresponding quantity of power Δ P, the three-phase system voltage over zero Time Calculation of utilizing the controller of Active Power Filter-APF to capture goes out the phase theta when three-phase
a, θ
b, θ
c
B) calculate three-phase idealized system electric current (three symmetrical sinusoidal current), and it is compared with the load current of actual measurement gained, its difference is exactly detection gained result, the electric current that just need compensate.
The effective value of three-phase idealized system electric current does;
The instantaneous value of three-phase idealized system electric current does;
Expression-form by current instantaneous value can find out that they do not receive the influence of system voltage distortion, under any circumstance all can be distortionless ideal sinusoidal electric currents
The detection result does;
i
ac＝i
la-i
ap，i
bc＝i
lb-i
bp，i
cc＝i
lc-i
cp
C) the detection result is carried out Fourier analysis; Remove the High-frequency Interference component and only keep and compensate the relevant component of purpose; And then get rid of possible interference, obtaining
Fourier analysis algorithm is ripe mathematical algorithm;
D) Fourier analysis is removed result after the High-frequency Interference as the electric current of needs compensation; Be used for calculating generation PWM modulation signal, control active electric power filter to output current
is realized the compensation target.
A kind of controller of Active Power Filter-APF and control method thereof owing to adopt said structure and method, have the following advantages and good effect; 1, proposed improved electric current demodulation method, this method good stability can avoid interference, and improves compensation effect; 2, the circuit of the controller of perfect Active Power Filter-APF has been proposed; On the controller that goes out according to this circuit production, move the control algolithm that is designed; Can realize effective control to active filter; Reach good harmonic suppression effect, and can realize functions such as compensating power, balance three-phase load.3, this controller response speed is fast, can be in 80 microseconds load-responsive change and follow the tracks of compensation.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation;
Fig. 1 is the controller circuitry theory diagram of a kind of Active Power Filter-APF of the present invention;
Fig. 2 is the controller control method main program flow chart of a kind of Active Power Filter-APF of the present invention;
In Fig. 1,1, the anti-interference filtration circuit; 2, A/D converter ic chip; 3, DSP digital signal processor; 4, input/output interface circuit; 5, drive signal control transformation circuit; 6, memory RAM chip; 7, auxiliary centre process chip; 8, communication interface circuit.
Embodiment
As shown in Figure 1, Fig. 1 is the control circuit theory diagram of controller, and it has described the circuit function structure and the signal transmission of The whole control circuit board.It comprises the voltage to electrical network, voltage, current signal Acquisition Circuit and the anti-interference filtration circuit 1 that the electric current electric weight measures; The A/D converter ic chip 2 that input links to each other with anti-interference filtration circuit 1 output; Core calculations and control chip DSP digital signal processor 3 that input links to each other with A/D converter ic chip 2 outputs; The input/output interface circuit 4, drive signal control transformation circuit 5 and the double port memory RAM chip 6 that link to each other with these DSP digital signal processor 3 outputs successively; The auxiliary centre process chip 7 that is used for communication that links to each other with double port memory RAM chip 6 outputs, and the communication interface circuit 8 that links to each other with this auxiliary centre process chip output.
Among Fig. 1, comprise anti-interference filtration circuit 1, A/D converter ic chip 2, the result of A/D converter ic chip conversion gives DSP digital signal processor 3, and DSP digital signal processor 3 of the present invention adopts the TMS320F2812 chip of TI company.Input/output interface circuit 4 (I/O circuit) is used to detect the output of external node input and Control Node, and operation is closed/cut to one of function for control contactor.Drive signal control transformation circuit 5 is control transformation circuit of electronic power switch device IGBT, realizes the pwm control signal output and execution of control system.Double port memory RAM memory chip 6, auxiliary centre process chip 7, communication interface circuit 8.Auxiliary centre process chip 7 realizes and extraneous communication through communication interface circuit 8 through the exchanges data between 6 realizations of memory RAM memory chip and the DSP digital signal processor 3, realizes man-machine interaction.
Referring to Fig. 2, Fig. 2 is the controller control method main program flow chart of a kind of Active Power Filter-APF of the present invention; Storage control program in the DSP digital signal processor; Program with the amplitude information and the phase information separate computations of electric current, has avoided the present demodulation method that adopts possibly receive the system voltage distortion effects and the problem of detection distortion when calculating the idealized system electric current; It carries out Fourier analysis to the detection result; Remove the High-frequency Interference component and only keep and the relevant component of compensation purpose, and then got rid of possible interference, make and control effect and further improve.Step 10 beginning, step 11 is the collection and the storage of signal, the signal initialization to gathering in step 12; In step 13, variablees such as voltage, electric current, power are calculated; Execution of step 13 backs get into step 14 and calculate the output reference current, in step 15, reference current are carried out Fourier analysis, and step 16 is calculated and generated the PWM modulation signal; Execution of step 16 backs get into step 17, the output control signal.
Combine accompanying drawing that the present invention has been carried out exemplary description above; Obviously the concrete realization of the present invention does not receive the restriction of aforesaid way; As long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; Or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (5)
1. the controller of an Active Power Filter-APF; It is characterized in that; It comprises the voltage to electrical network, voltage, current signal Acquisition Circuit and the anti-interference filtration circuit (1) that the electric current electric weight measures; The A/D converter ic chip (2) that input links to each other with anti-interference filtration circuit (1) output; Core calculations and control chip DSP digital signal processor (3) that input links to each other with A/D converter ic chip (2) output; The input/output interface circuit (4), drive signal control transformation circuit (5) and the double port memory RAM chip (6) that link to each other with this DSP digital signal processor (3) output successively, the auxiliary centre process chip (7) that is used for communication that links to each other with double port memory RAM chip (6) output, and the communication interface circuit (8) that links to each other with this auxiliary centre process chip output.
2. the controller of Active Power Filter-APF according to claim 1 is characterized in that, described DSP digital signal processor (3) model is TMS320F2812.
3. Active Power Filter-APF controller according to claim 1 is characterized in that, input/output interface circuit (4), drive signal control transformation circuit (5) have all adopted photoelectricity coupling buffer circuit.
4. the controller of Active Power Filter-APF according to claim 1 is characterized in that, described auxiliary centre process chip (7) adopts single-chip microcomputer or adopts the DSP digital signal processor.
5. the controller control method according to the described Active Power Filter-APF of claim 1～4 is characterized in that, storage control program in the described DSP digital signal processor; Described program is when calculating the idealized system electric current; With the amplitude information and the phase information separate computations of electric current, avoided the present demodulation method that adopts possibly receive the system voltage distortion effects and the problem of detection distortion, it carries out Fourier analysis to the detection result; Remove the High-frequency Interference component and only keep and compensate the relevant component of purpose; And then got rid of possible interference, and the control effect is further improved, described method comprises the following steps;
A) utilize the controller of Active Power Filter-APF to gather the system voltage signal u of gained
Sa, u
Sb, u
ScWith load current signal i
La, i
Lb, i
LcCalculate the total active power P of three-phase of load, phase voltage effective value U
s, utilize the controller of Active Power Filter-APF to gather the DC bus-bar voltage signal U of gained
DcCalculate DC bus-bar voltage deviation signal Δ U
Dc, and then proportion of utilization-integral element calculates and Δ U
DcCorresponding quantity of power Δ P, the three-phase system voltage over zero Time Calculation of utilizing the controller of Active Power Filter-APF to capture goes out the phase theta when three-phase
a, θ
b, θ
c
B) calculate three-phase idealized system electric current (three symmetrical sinusoidal current), and it is compared with the load current of actual measurement gained, its difference is exactly detection gained result, the electric current that just need compensate.
The effective value of three-phase idealized system electric current does;
The instantaneous value of three-phase idealized system electric current does;
Expression-form by current instantaneous value can find out that they do not receive the influence of system voltage distortion, under any circumstance all can be distortionless ideal sinusoidal electric currents
The detection result does;
i
ac＝i
la-i
ap，i
bc＝i
lb-i
bp，i
cc＝i
lc-i
cp
C) the detection result is carried out Fourier analysis; Remove the High-frequency Interference component and only keep and compensate the relevant component of purpose; And then get rid of possible interference, obtaining
Fourier analysis algorithm is ripe mathematical algorithm;
D) Fourier analysis is removed result after the High-frequency Interference as the electric current of needs compensation; Be used for calculating generation PWM modulation signal, control active electric power filter to output current
is realized the compensation target.
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| CN201110428869.2A CN102437576B (en) | 2011-12-20 | 2011-12-20 | Active power filter (APF) controller and control method thereof |
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| CN201110428869.2A CN102437576B (en) | 2011-12-20 | 2011-12-20 | Active power filter (APF) controller and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684195A (en) * | 2012-05-22 | 2012-09-19 | 浙江大学 | Low pass filter, active power filtering device and harmonic detection method |
| CN104078984A (en) * | 2013-03-28 | 2014-10-01 | 江苏方程电力科技有限公司 | Digital controller for alternating current power grid low-voltage intelligent dynamic reactive power compensation device |
| CN104135006A (en) * | 2014-08-25 | 2014-11-05 | 秦皇岛有源理工科技开发有限公司 | Active power filter controller based on hysteresis comparison |
| CN113466537A (en) * | 2021-05-26 | 2021-10-01 | 国网江苏省电力有限公司淮安供电分公司 | Anti-interference current and voltage acquisition method for power system |
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| CN101421684A (en) * | 2006-04-13 | 2009-04-29 | 株式会社日立制作所 | Power converting device, and control method therefor |
| CN101752868A (en) * | 2009-11-09 | 2010-06-23 | 天津理工大学 | Low-frequency load reduction control system and working method thereof |
| CN201541131U (en) * | 2009-11-04 | 2010-08-04 | 南京因泰莱配电自动化设备有限公司 | Intelligent powerless compensation device of high-voltage line |
| CN202405785U (en) * | 2011-12-20 | 2012-08-29 | 安徽鑫龙电器股份有限公司 | Controller of active power filter |
-
2011
- 2011-12-20 CN CN201110428869.2A patent/CN102437576B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101421684A (en) * | 2006-04-13 | 2009-04-29 | 株式会社日立制作所 | Power converting device, and control method therefor |
| CN201541131U (en) * | 2009-11-04 | 2010-08-04 | 南京因泰莱配电自动化设备有限公司 | Intelligent powerless compensation device of high-voltage line |
| CN101752868A (en) * | 2009-11-09 | 2010-06-23 | 天津理工大学 | Low-frequency load reduction control system and working method thereof |
| CN202405785U (en) * | 2011-12-20 | 2012-08-29 | 安徽鑫龙电器股份有限公司 | Controller of active power filter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684195A (en) * | 2012-05-22 | 2012-09-19 | 浙江大学 | Low pass filter, active power filtering device and harmonic detection method |
| CN104078984A (en) * | 2013-03-28 | 2014-10-01 | 江苏方程电力科技有限公司 | Digital controller for alternating current power grid low-voltage intelligent dynamic reactive power compensation device |
| CN104135006A (en) * | 2014-08-25 | 2014-11-05 | 秦皇岛有源理工科技开发有限公司 | Active power filter controller based on hysteresis comparison |
| CN113466537A (en) * | 2021-05-26 | 2021-10-01 | 国网江苏省电力有限公司淮安供电分公司 | Anti-interference current and voltage acquisition method for power system |
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