CN201219199Y - Full digital active electric power filtering controller - Google Patents
Full digital active electric power filtering controller Download PDFInfo
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- CN201219199Y CN201219199Y CNU2008200674574U CN200820067457U CN201219199Y CN 201219199 Y CN201219199 Y CN 201219199Y CN U2008200674574 U CNU2008200674574 U CN U2008200674574U CN 200820067457 U CN200820067457 U CN 200820067457U CN 201219199 Y CN201219199 Y CN 201219199Y
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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
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02E40/30—Reactive power compensation
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Abstract
The utility model provides an all-digital active power filter controller, including a harmonics detection circuit, a control circuit, a compensation main loop. The compensation circuit is a main circuit composed of a converter constituted by a compensating inductance and a controllable switching device; the harmonic detection circuit is constituted by a current transformer, an A/D conversion circuit and a signal processing circuit, and the output of the A/D conversion circuit is connected to the control circuit; the control circuit adopts a multi-function control module, including a program memory, an DSP, an D/A conversion circuit and a pulse power amplifier drive circuit, and the pulse power amplifier drive circuit is connected to the control terminal of the controllable switching device. The control mode is a triangular carrier control in the current follow-up control.
Description
Technical field
The utility model relates to a kind of digital active power filtering controller, is a kind of base apparatus that can dynamically suppress harmonic wave, compensating power, inhibition voltage flicker, adjusting and balance three-phase imbalance voltage, raising system power factor, improve the flexible power supply technique of the quality of power supply.
Background technology
Active Power Filter-APF is a kind of base apparatus that can dynamically suppress harmonic wave, compensating power, inhibition voltage flicker, adjusting and balance three-phase imbalance voltage, raising system power factor, improve the flexible power supply technique of the quality of power supply.Just can realize compensation to each harmonic and fundamental wave reactive power power with a table apparatus, it can send positive and negative reactive power to electrical network, supports line voltage, improves power grid quality, by enterprise and power supply department are advocated.
In the face of electric power system idle and situation that harmonic problem is on the rise, traditional various reactive power compensations and harmonic suppressing method have been difficult to satisfy the needs of modern power systems.As a kind of novel compensator, the characteristics that Active Power Filter-APF (APF) has are as follows:
(1) the humorous reactive loss that involves that can all change big or small and frequency fast compensates, and also can suppress voltage flicker, adjusting and balance three-phase imbalance voltage etc. simultaneously;
(2) filtering characteristic is not subjected to the influence of system impedance and frequency, can eliminate the danger with electric network impedance generation series parallel resonance, and the resonance of external circuit is had damping action;
(3) have adaptive ability, can carry out dynamic tracking compensation rapidly the harmonic wave that changes.
(4) just can realize compensation with a table apparatus to each harmonic and fundamental wave reactive power power.
Shortcoming is that the price of Active Power Filter-APF is more expensive than traditional passive filter.
Because above-mentioned advantage, Active Power Filter-APF as comprehensive regulation electric network pollution, improve grid stability and improve that a key technology of the quality of power supply is industrial in various countries to be paid close attention to widely.
Summary of the invention
The purpose of this utility model is: utilize pulse width modulation (PWM) converter module and digital signal processor (DSP) combination and exploitation to go out to have world-class digital active power filtering controller in this century.Its characteristics, novel part are: from reliability, at requirement and the China's national situation of China enterprise to current electric product, be the control core device with DSP in conjunction with international most advanced pulse width modulating technology, computer technology, research and development.
The technical solution of the utility model is: digital active power filtering controller comprises harmonics detection circuit, control circuit, compensation major loop.Compensating circuit is the major loop that the current transformer of compensating inductance and gate-controlled switch device composition constitutes; Harmonics detection circuit is made up of current transformer, A/D change-over circuit and signal processing circuit, and the output of A/D change-over circuit is connected with control circuit; Control circuit adopts the multi-functional control module, and the multi-functional control module comprises program storage, DSP, D/A change-over circuit and pulse amplifier drive circuit, and the pulse amplifier drive circuit is connected with the gate-controlled switch device control end of current transformer.
Described digital active power filtering controller, control mode are the triangular carrier control in the current tracking control.
Advantage of the present utility model and major technique characteristics are: become digital signal after by harmonics detection circuit the three-phase current signal that collects being changed by A/D, by after the three-phase current processing of DSP to the sampling acquisition fundamental reactive component and harmonic component being separated, the current signal that obtains required compensation is reference current signal i
RefOffset current i
cHandle back and triangular carrier relatively with the error delta i of reference current through pi regulator, produce the pwm pulse signal of corresponding control switch device, the offset current that makes the switching device generation fast and accurately the track reference electric current to reach the purpose of quick compensation.Various parameters are digital to be write, and software latchs, forever constant, is not affected by the external environment, and removes to latch and can rewrite parameter.Also have automatic phasing, overcurrent, open circuit, phase shortage, perfect protection such as overheated simultaneously, and have current failure memory, telegram in reply query function.
Description of drawings
Fig. 1 is digital active power filtering controller principle block diagram;
Fig. 2 is a compensation major loop theory diagram;
Fig. 3 is the pulse driving circuit theory diagram;
Fig. 4 is the DSP main program block diagram.
Embodiment
Fig. 1 is digital active power filtering controller principle block diagram.Harmonics detection circuit comprises harmonic wave sampling instrument transformer Lj, harmonic signal treatment circuit, and the output of harmonic signal treatment circuit is connected with control circuit; Control circuit comprises that dsp controller, offset current detect instrument transformer Lc and pulse driving circuit, offset current detects instrument transformer Lc and is positioned at compensation major loop output, offset current detects instrument transformer Lc and is connected with an input of pulse driving circuit, and the output of dsp controller is connected with another input of pulse driving circuit; The output of pulse driving circuit is connected with the switching device control end of compensation in the major loop.
Fig. 2 is a compensation major loop theory diagram: mainly be made up of voltage source inverter and compensation resonant inductance.L among the figure
1, L
2, L
3Be resonant inductance, C
dBe building-out capacitor, T1, T2, T3, T4, T5, T6 are switching device, and D1, D2, D3, D4, D5, D6 are fly-wheel diode, and k1～k6 is the switching device control utmost point.
Fig. 3 is the pulse driving circuit theory diagram: pulse driving circuit comprises triangular-wave generator, subtracter E, pi regulator, comparator; The input of subtracter E is connected input ic and ierf with the output of offset current detection instrument transformer and dsp controller respectively; Subtracter subtracts each other ic and ierf, i gives pi regulator with Δ, to after handling, pi regulator compare with the error of reference current with triangular carrier, produce the switching device that corresponding pwm pulse comes the control compensation major loop, offset current track reference electric current is changed, offset the mains by harmonics composition.
Control mode:
Fig. 4 is the DSP main program block diagram: the The whole control device is the means that adopt loop adjustment.Nonlinear load is sent into DSP through instrument transformer Lj, harmonic wave detection signal processing circuit processes after the A/D conversion.DSP is reference current i by the size that the harmonic current algorithm computation goes out harmonic compensation current
Ref
The triangular wave comparative approach that this method adopts and the power supply cycle is synchronous is determined the switch phase of Active Power Filter-APF switching device.The offset current i of active filter output
cWith reference current i
RefDifference handle the back and triangular wave compares through pi regulator, produce corresponding pwm pulse.Work as i
c＞i
RefThe time, the switching device of control Active Power Filter-APF reduces offset current; Work as i
c＜i
RefThe time, the switching device of control Active Power Filter-APF increases offset current.The advantage of this triangular carrier curren tracing control method is very simple, implements easily, and is little to the dependence of the parameter of Active Power Filter-APF and structure.
Control mode:
The The whole control device is the means that adopt loop adjustment.Nonlinear load provides current electric current and voltage-phase to harmonics detection circuit and multi-functional control module, sends into DSP after the A/D conversion.DSP is reference current i by the size that harmonic current detection calculates harmonic compensation current
RefThe offset current of active filter output and the error of reference current compare with triangular carrier after proportional integral PI handles, produce the switching circuit that corresponding pwm pulse comes control inverter, offset current track reference electric current is changed, offset the mains by harmonics composition.Below be illustrated with regard to the control mode of Active Power Filter-APF.
Three, operation principle
(1) the The whole control device is the means that adopt loop adjustment.Harmonic wave detects link and gathers load current i from nonlinear load
LInformation is sampled and quantize to load current by the A/D change-over circuit then, is that digital signal send DSP to handle with analog signal conversion.
(2) DSP carries out three-phase/two phase inversion, high-pass filtering, two-phase/three-phase conversion process to the three-phase current that sampling obtains, and fundamental reactive component and harmonic component is separated, thereby obtained the reference current i of Active Power Filter-APF
Ref
(3) calculate reference current i according to DSP
RefThe compensating current signal i that active filter produces
cWith reference current i
RefSubtract each other after proportional integral PI handles, relatively form pwm signal, drive inverter switching device, the offset current i that inverter is produced with triangular carrier
cTrack reference current i rapidly and accurately
Ref
Claims (2)
1. a digital active power filtering controller comprises harmonics detection circuit, control circuit and compensating circuit, it is characterized in that: compensating circuit is the compensation major loop that inductance and gate-controlled switch device are formed; Harmonics detection circuit comprises harmonic wave sampling instrument transformer, harmonic signal treatment circuit, and the output of harmonic signal treatment circuit is connected with control circuit; Control circuit comprises that dsp controller, offset current detect instrument transformer and pulse driving circuit, offset current detects instrument transformer and is positioned at compensation major loop output, offset current detects instrument transformer and is connected with an input of pulse driving circuit, and the output of dsp controller is connected with another input of pulse driving circuit; The output of pulse driving circuit is connected with the switching device control end of compensation in the major loop.
2. digital active power filtering controller according to claim 1, it is characterized in that: pulse driving circuit comprises triangular-wave generator, subtracter, pi regulator, comparator; The input of subtracter is connected with the output of offset current detection instrument transformer and dsp controller respectively, subtracter is connected with the pi regulator input, the pi regulator output is connected with an input of comparator, and another input of comparator is connected with the output of triangular-wave generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200674574U CN201219199Y (en) | 2008-05-29 | 2008-05-29 | Full digital active electric power filtering controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200674574U CN201219199Y (en) | 2008-05-29 | 2008-05-29 | Full digital active electric power filtering controller |
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| CN201219199Y true CN201219199Y (en) | 2009-04-08 |
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| CNU2008200674574U Expired - Fee Related CN201219199Y (en) | 2008-05-29 | 2008-05-29 | Full digital active electric power filtering controller |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401243A (en) * | 2013-07-26 | 2013-11-20 | 徐州中矿大传动与自动化有限公司 | Appointed subharmonic compensation APF (active power filter) and harmonic detection and control method thereof |
| CN104062998A (en) * | 2013-03-20 | 2014-09-24 | 北京思源清能电气电子有限公司 | Double closed loop control method for APF/SVG non-master parallel connection |
| CN105743104A (en) * | 2016-04-25 | 2016-07-06 | 哈尔滨理工大学 | Controller and control method for reactive compensation and low-order harmonic current suppression of power grid |
| CN105811419A (en) * | 2016-04-25 | 2016-07-27 | 哈尔滨理工大学 | Control method for accurately restraining power grid harmonics |
| CN106374469A (en) * | 2015-07-22 | 2017-02-01 | 利思电气（上海）有限公司 | Pole-mounted power active filtering apparatus with reactive scheduling function |
| CN108768148A (en) * | 2018-06-16 | 2018-11-06 | 福建华宏天城机电设备有限公司 | A kind of submersible motor power conditioner |
-
2008
- 2008-05-29 CN CNU2008200674574U patent/CN201219199Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062998A (en) * | 2013-03-20 | 2014-09-24 | 北京思源清能电气电子有限公司 | Double closed loop control method for APF/SVG non-master parallel connection |
| CN103401243A (en) * | 2013-07-26 | 2013-11-20 | 徐州中矿大传动与自动化有限公司 | Appointed subharmonic compensation APF (active power filter) and harmonic detection and control method thereof |
| CN103401243B (en) * | 2013-07-26 | 2015-10-28 | 徐州中矿大传动与自动化有限公司 | A kind of harmonic detecting and control method of specifying subharmonic compensation APF |
| CN106374469A (en) * | 2015-07-22 | 2017-02-01 | 利思电气（上海）有限公司 | Pole-mounted power active filtering apparatus with reactive scheduling function |
| CN105743104A (en) * | 2016-04-25 | 2016-07-06 | 哈尔滨理工大学 | Controller and control method for reactive compensation and low-order harmonic current suppression of power grid |
| CN105811419A (en) * | 2016-04-25 | 2016-07-27 | 哈尔滨理工大学 | Control method for accurately restraining power grid harmonics |
| CN105811419B (en) * | 2016-04-25 | 2018-08-21 | 哈尔滨理工大学 | A kind of accurate control method for inhibiting mains by harmonics |
| CN108768148A (en) * | 2018-06-16 | 2018-11-06 | 福建华宏天城机电设备有限公司 | A kind of submersible motor power conditioner |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090408 |