CN203707781U - Active filter - Google Patents
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- Publication number
- CN203707781U CN203707781U CN201420110445.0U CN201420110445U CN203707781U CN 203707781 U CN203707781 U CN 203707781U CN 201420110445 U CN201420110445 U CN 201420110445U CN 203707781 U CN203707781 U CN 203707781U
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- Prior art keywords
- circuit
- harmonic
- current
- active filter
- harmonic analysis
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- Expired - Lifetime
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- 238000012545 processing Methods 0.000 claims abstract description 29
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 230000015271 coagulation Effects 0.000 claims description 20
- 238000005345 coagulation Methods 0.000 claims description 20
- 238000011002 quantification Methods 0.000 claims description 8
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Classifications
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
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- Power Conversion In General (AREA)
Abstract
The utility model discloses an active filter which mainly comprises an FPGA (field programmable gate array) main control chip and an A/D (analog to digital) converting circuit which are connected, wherein the FPGA main control chip internally comprises a primary processing circuit, a harmonic analysis circuit and a modulator circuit, wherein the primary processing circuit is connected with the A/D converting circuit and used for performing quantitative processing, digital filtering and amplitude limiting processing on sampled data which are converted into digital signals by the A/D converting circuit; the harmonic analysis circuit is connected with the primary processing circuit and used for performing harmonic analysis on an amplitude limiting signal output from the primary processing circuit and separating harmonic from first harmonic; and the modulator circuit is connected with the harmonic analysis circuit and used for sending a drive pulse to a compensating current generating circuit in a PWM (pulse-width modulation) pulse signal mode and driving an IGBT (insulated gate bipolar transistor) or an IPM (intelligent power module) to generate the compensating current, the amplitude of the compensating current is equal to that of the harmonic current of a power grid, the polarity of the compensating current is opposite to that of the harmonic current of the power grid, and the compensating current is injected to the power grid for compensating or offsetting the harmonic current, and the power harmonic is eliminated initially. The whole structure of the active filter has the characteristics of timeliness in compensation, high stability, accurate filtration for harmonic and the like.
Description
Technical field
The utility model relates to filter field, specifically, is active filter.
Background technology
Active filter utilizes controllable power semiconductor to inject the electric current contrary with harmonic source current amplitude equal phase to electrical network, the total harmonic current that makes power supply is zero to reach the object of real-Time Compensation harmonic current, and existing filter is made up of instruction current computing circuit and two major parts of offset current circuit for generating.Electric current in instruction current computing circuit real time monitoring circuit is also converted to digital signal by analog current signal and sends into high speed numerical processor DSP signal is processed, and harmonic wave first-harmonic is separated and send driving pulse with pulse-modulated signal form to offset current circuit for generating to drive IGBT power model growth mains by harmonics current amplitude.
Existing DSP process chip is general signal processor, realize data processing with software, due to hardware configuration condition restriction, mainly still relying on software to extract instruction carries out, the standard of carrying out based on serial, reaction time is long, thereby causes processing speed slow, is unfavorable for carrying out harmonic wave timely and eliminates.
Utility model content
The purpose of this utility model is to provide source filter, overcome the deficiencies in the prior art, the hardware data treatment circuit that utilization has the FPGA main control chip internal build of high-speed hardware parallel algorithm and high operate frequency carries out quantification treatment to sampled data, digital filtering and amplitude limiting processing, process and send driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating in time through harmonic analysis again, drive IGBT inverter circuit, generate and equate with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated timely or offset, initiatively eliminate electric harmonic, total has scientific and reasonable, advanced technology, compensation in time, stability is high, the features such as accurate filtering harmonic wave.
The utility model is achieved through the following technical solutions: active filter, mainly by FPGA main control chip connect A D change-over circuit form; Described FPGA main control chip inside is provided with coagulation circuit, harmonic analysis circuit and modulation circuit, described coagulation circuit connect A D change-over circuit, described harmonic analysis circuit connects coagulation circuit, and described harmonic analysis circuit connects modulation circuit;
Wherein, coagulation circuit for by through A the D change-over circuit sampled data that is converted to digital signal carry out quantification treatment, digital filtering and amplitude limiting processing;
Harmonic analysis circuit, connects coagulation circuit, for the limitation signal of coagulation circuit output is carried out to harmonic analysis, and harmonic wave is separated with first-harmonic;
Modulation circuit, connect harmonic analysis circuit, for sending driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating, drive IGBT power model, generation equates with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated or offset, initiatively eliminate electric harmonic.Utilization has the FPGA main control chip inside of high-speed hardware parallel algorithm and high operate frequency by coagulation circuit, harmonic analysis circuit, with the data acquisition processing circuit that modulation circuit carries, sampled data is carried out to quantification treatment, digital filtering and amplitude limiting processing, process and send driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating in time through harmonic analysis again, drive IGBT inverter circuit, generate and equate with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated timely or offset, initiatively eliminate electric harmonic, total has scientific and reasonable, advanced technology, compensation in time, stability is high, the features such as accurate filtering harmonic wave.
For better realizing the utility model, in described FPGA main control chip, be also provided with treatment circuit, described treatment circuit connects harmonic analysis circuit, be used for carrying out each electrical parameter Graphics Processing and human-computer interactive control processing, and be connected with display port with PORT COM, utilize PORT COM and man-machine interaction assembly to link up, and will output on display device and show through FPGA main control chip each electrical parameter after treatment by display port.
For better realizing the utility model, also comprise with A the signal processing circuit that is connected of D change-over circuit, the voltage signal being gathered by electrical network and load current signal through signal processing circuit carry out that signal amplifies and Shape correction prepare against be transferred to A D change-over circuit carry out high speed A D change.
For better realizing the utility model, also comprise drive circuit, described drive circuit connects modulation circuit, and the PWM modulating pulse being produced by modulation circuit is amplified to the required level of IGBT power model by drive circuit by pwm pulse.
For better realizing the utility model, also comprise inverter circuit, described inverter circuit connects drive circuit, and the pwm pulse of being exported by drive circuit process inverter circuit modulation generation equates with mains by harmonics current amplitude, opposite polarity offset current.
For better realizing the utility model, described inverter circuit adopts IGBT inverter circuit.IGBT (Insulated Gate Bipolar Transistor), insulated gate bipolar transistor, the compound full-control type voltage driven type power semiconductor being made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), has the advantage of the high input impedance of MOSFET and low conduction voltage drop two aspects of GTR concurrently.Have than other power tubes that driving power is little, output current is large, puncture voltage is high, operating frequency advantages of higher.
For better realizing the utility model, also comprise filter circuit, described filter circuit connects inverter circuit, utilize filter circuit by the filtering of offset current medium-high frequency carrier current, the offset current that makes to inject electrical network from filter circuit is entirely that mains by harmonics current amplitude equates, opposite polarity offset current.
The utility model compared with prior art, has the following advantages and beneficial effect:
(1) the utility model overcomes the deficiencies in the prior art, utilization has the hardware data treatment circuit that the FPGA of high-speed hardware parallel algorithm and high operate frequency is main control chip internal build sampled data is carried out to quantification treatment, digital filtering and amplitude limiting processing, process and send driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating in time through harmonic analysis again, drive IGBT inverter circuit, generate and equate with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated timely or offset, initiatively eliminate electric harmonic, total has scientific and reasonable, advanced technology, compensation in time, stability is high, the features such as accurate filtering harmonic wave.
(2) modulation circuit described in the utility model can be sent driving pulse to offset current circuit for generating with pulse-width modulation PWM impulse form, has advantages of that noise resistivity is superpower and noise effect can be reduced to minimum.
(3) inverter circuit described in the utility model IGBT (Insulated Gate Bipolar Transistor) used, insulated gate bipolar transistor, the compound full-control type voltage driven type power semiconductor being made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), has the advantage of the high input impedance of MOSFET and low conduction voltage drop two aspects of GTR concurrently.Have than other power tubes that driving power is little, output current is large, puncture voltage is high, operating frequency advantages of higher.
Brief description of the drawings
Fig. 1 is that FPGA main control chip described in the utility model inside arranges block diagram.
Fig. 2 is the utility model theory diagram.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Embodiment:
The utility model proposes active filter, as shown in Figure 1, mainly by FPGA main control chip connect A D change-over circuit form; Described FPGA main control chip inside is provided with coagulation circuit, harmonic analysis circuit and modulation circuit, described coagulation circuit connect A D change-over circuit, described harmonic analysis circuit connects coagulation circuit, and described harmonic analysis circuit connects modulation circuit;
Wherein, coagulation circuit for by through A the D change-over circuit sampled data that is converted to digital signal carry out quantification treatment, digital filtering and amplitude limiting processing;
Harmonic analysis circuit, connects coagulation circuit, for the limitation signal of coagulation circuit output is carried out to harmonic analysis, and harmonic wave is separated with first-harmonic;
Modulation circuit, connect harmonic analysis circuit, for sending driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating, drive IGBT power model, generation equates with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated or offset, initiatively eliminate electric harmonic.Utilization has the FPGA main control chip inside of high-speed hardware parallel algorithm and high operate frequency by coagulation circuit, harmonic analysis circuit, with the data acquisition processing circuit that modulation circuit carries, sampled data is carried out to quantification treatment, digital filtering and amplitude limiting processing, process and send driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating in time through harmonic analysis again, drive IGBT inverter circuit, generate and equate with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated timely or offset, initiatively eliminate electric harmonic, total has scientific and reasonable, advanced technology, compensation in time, stability is high, the features such as accurate filtering harmonic wave.
For better realizing the utility model, shown in Fig. 1 and Fig. 2, in described FPGA main control chip, be also provided with treatment circuit, described treatment circuit connects harmonic analysis circuit, be used for carrying out each electrical parameter Graphics Processing and human-computer interactive control processing, and be connected with display port with PORT COM, utilize PORT COM and man-machine interaction assembly to link up, and will output on display device and show through FPGA main control chip each electrical parameter after treatment by display port.
For better realizing the utility model, shown in Fig. 1 and Fig. 2, also comprise with A the signal processing circuit that is connected of D change-over circuit, the voltage signal being gathered by electrical network and load current signal through signal processing circuit carry out that signal amplifies and Shape correction prepare against be transferred to A D change-over circuit carry out high speed A D change.
For better realizing the utility model, shown in Fig. 1 and Fig. 2, also comprise drive circuit, described drive circuit connects modulation circuit, and the PWM modulating pulse being produced by modulation circuit is amplified to the required level of IGBT power model by drive circuit by pwm pulse.
For better realizing the utility model, shown in Fig. 1 and Fig. 2, also comprise inverter circuit, described inverter circuit connects drive circuit, and the pwm pulse of being exported by drive circuit process inverter circuit modulation generation equates with mains by harmonics current amplitude, opposite polarity offset current.
For better realizing the utility model, shown in Fig. 1 and Fig. 2, described inverter circuit adopts IGBT inverter circuit.IGBT (Insulated Gate Bipolar Transistor), insulated gate bipolar transistor, the compound full-control type voltage driven type power semiconductor being made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), has the advantage of the high input impedance of MOSFET and low conduction voltage drop two aspects of GTR concurrently.Have than other power tubes that driving power is little, output current is large, puncture voltage is high, operating frequency advantages of higher.
For better realizing the utility model, shown in Fig. 1 and Fig. 2, also comprise filter circuit, described filter circuit connects inverter circuit, utilize filter circuit by the filtering of offset current medium-high frequency carrier current, the offset current that makes to inject electrical network from filter circuit is entirely that mains by harmonics current amplitude equates, opposite polarity offset current.
The utility model overcomes the deficiencies in the prior art, utilization has the hardware data treatment circuit that the FPGA of high-speed hardware parallel algorithm and high operate frequency is main control chip internal build sampled data is carried out to quantification treatment, digital filtering and amplitude limiting processing, process and send driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating in time through harmonic analysis again, drive IGBT inverter circuit, generate and equate with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated timely or offset, initiatively eliminate electric harmonic, total has scientific and reasonable, advanced technology, compensation in time, stability is high, the features such as accurate filtering harmonic wave.
The above; it is only preferred embodiment of the present utility model; not the utility model is done to any pro forma restriction, any simple modification, equivalent variations that every foundation technical spirit of the present utility model is done above embodiment, within all falling into protection range of the present utility model.
Claims (7)
1. active filter, is characterized in that: mainly by FPGA main control chip connect A D change-over circuit form; Described FPGA main control chip inside is provided with coagulation circuit, harmonic analysis circuit and modulation circuit, described coagulation circuit connect A D change-over circuit, described harmonic analysis circuit connects coagulation circuit, and described harmonic analysis circuit connects modulation circuit;
Wherein, coagulation circuit for by through A the D change-over circuit sampled data that is converted to digital signal carry out quantification treatment, digital filtering and amplitude limiting processing;
Harmonic analysis circuit, connects coagulation circuit, for the limitation signal of coagulation circuit output is carried out to harmonic analysis, and harmonic wave is separated with first-harmonic;
Modulation circuit, connect harmonic analysis circuit, for sending driving pulse with pulse-width modulation PWM signal form to offset current circuit for generating, drive IGBT power model, generation equates with mains by harmonics current amplitude, opposite polarity offset current injects electrical network, harmonic current is compensated or offset, initiatively eliminate electric harmonic.
2. active filter according to claim 1, is characterized in that: in described FPGA main control chip, be also provided with microprocessor, described microprocessor connects harmonic analysis circuit;
Wherein, microprocessor is used for carrying out each electrical parameter Graphics Processing and human-computer interactive control processing, and is connected with display port with PORT COM.
3. active filter according to claim 1, is characterized in that: also comprise with A the signal processing circuit that is connected of D change-over circuit.
4. active filter according to claim 1, is characterized in that: also comprise drive circuit, described drive circuit connects modulation circuit.
5. active filter according to claim 4, is characterized in that: also comprise inverter circuit, described inverter circuit connects drive circuit.
6. active filter according to claim 5, is characterized in that: described inverter circuit adopts IGBT inverter circuit.
7. active filter according to claim 5, is characterized in that: also comprise filter circuit, described filter circuit connects inverter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420110445.0U CN203707781U (en) | 2014-03-12 | 2014-03-12 | Active filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420110445.0U CN203707781U (en) | 2014-03-12 | 2014-03-12 | Active filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707781U true CN203707781U (en) | 2014-07-09 |
Family
ID=51058163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420110445.0U Expired - Lifetime CN203707781U (en) | 2014-03-12 | 2014-03-12 | Active filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707781U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633968A (en) * | 2016-03-28 | 2016-06-01 | 成都天进仪器有限公司 | Safe and reliable active power filtering device of smart power grid |
| CN105656045A (en) * | 2016-03-28 | 2016-06-08 | 成都天进仪器有限公司 | Intelligent grid active power filter with heat dissipation function |
-
2014
- 2014-03-12 CN CN201420110445.0U patent/CN203707781U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633968A (en) * | 2016-03-28 | 2016-06-01 | 成都天进仪器有限公司 | Safe and reliable active power filtering device of smart power grid |
| CN105656045A (en) * | 2016-03-28 | 2016-06-08 | 成都天进仪器有限公司 | Intelligent grid active power filter with heat dissipation function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |