CN203774793U - Active filter - Google Patents
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- CN203774793U CN203774793U CN201420180355.9U CN201420180355U CN203774793U CN 203774793 U CN203774793 U CN 203774793U CN 201420180355 U CN201420180355 U CN 201420180355U CN 203774793 U CN203774793 U CN 203774793U
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- circuit
- signal
- active filter
- current sampling
- 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
- 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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- Power Conversion In General (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model belongs to the technical field of electric power filtering equipment, and relates to an active electric power filter. Provided is an active filter which comprises a signal sampling circuit, a signal acquisition processor, a response signal processor, an inversion drive circuit and an inversion circuit. The signal sampling circuit is composed of a signal zero-cross comparison circuit and a current sampling circuit. The output end of the signal zero-cross comparison circuit is electrically connected with the current sampling circuit which is connected with the signal acquisition processor. The signal acquisition processor is connected with the response signal processor which is connected with the inversion circuit via the inversion drive circuit. The signal sampling circuit and the inversion circuit are electrically connected on a power line respectively. Signal detection operation and control of the active filter are respectively controlled by an independent controller so that stability of a filtering system is guaranteed.
Description
Technical field
The utility model belongs to electric filtering equipment technical field, relates to a kind of Active Power Filter-APF.
Background technology
Because the use of the multiple electrical equipment of factor and family of electric power system self can affect the normal work of electric power system, electric power system is caused to certain impact and unbalanced by electrical characteristics; The harmonic wave that particularly the various harmonic sources in electric power system produce has also caused serious pollution to power system environment; Especially the increasingly extensive application of the nonlinear load such as power electronic equipment, the harmonic wave of its generation and idle electricity quality has been produced to very large impact; Traditional electrical network filter apparatus is passive filter, due to advantages such as cost are lower, simple in structure, reliable, easy to maintenance, be widely applied, it is the main method of current electricity supplying and using system harmonic wave inhibition and reactive power compensation, but it is not enough that it also has following two aspects: reason is that its volume is large, and filter effect and running situation are closely related, under specific circumstances passive filter may with system generation resonance; Therefore, only rely on passive filtering technology governance harmonic wave in the past can not meet the demands, must utilize this new technology of active power filtering to carry out filtering to electrical network; One of visible deficiency is that harmonic wave is difficult to filter.Some institution of higher learning of China, scientific research institutions and fewer companies have been carried out the research of Active Power Filter-APF in succession at present; But mostly also in emulation and low capacity experimental prototype conceptual phase, industrial only have several model machines to drop into trial run, and compensation effect is also unsatisfactory, and stability is also poor; Be difficult to be applied in actual electrical network.Studying carefully two of its deficiency is existing active filter poor stabilities, is difficult to be applied in actual electric network.
Utility model content
In order to address the above problem, technical problem to be solved in the utility model is to provide a kind of active filter, and input computing and control are controlled by separate controller respectively, guarantee the stability of filtering system.
In order to realize above-mentioned technical problem to be solved, the utility model has adopted following technical scheme:
An active filter, comprises signal sample circuit, signal acquisition process device, response signal processor, inverse changing driving circuit and inverter circuit; Described signal sample circuit is comprised of signal zero passage comparison circuit and current sampling circuit, and signal zero passage comparison circuit output is electrically connected to current sampling circuit; Described current sampling circuit connects signal acquisition process device, signal acquisition process device connection response signal processor; Described response signal processor connects inverter circuit by inverse changing driving circuit, and described signal sample circuit and inverter circuit are connected electrically on power line respectively.
Further, also comprise current-to-voltage converting circuit, described current-to-voltage converting circuit is between current sampling circuit and signal acquisition process device, and current sampling circuit connects signal acquisition process device by current-to-voltage converting circuit.
As preferably, described current-to-voltage converting circuit consists of precision resistance.
As preferably, described inverter circuit is by three-phase full-controlled bridge drive circuit and three-phase full-controlled bridge the electric circuit constitute.
As preferably, described drive circuit consists of inverter and drive unit.
Compared with prior art, it has following beneficial effect to the utility model: Active Power Filter-APF of the present utility model, and input computing and control are controlled by separate controller respectively, guarantee the stability of filtering system; Improved the response time of filter simultaneously; Compensation effect is obvious; By two-shipper, work in addition, affected by electric network impedance little.
Accompanying drawing explanation
Fig. 1: integrated circuit structured flowchart of the present utility model.
Fig. 2: embodiment circuit structure block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
Embodiment: Active Power Filter-APF principle of the present utility model is to utilize two-shipper to control, one is carried out data acquisition and computing, and operation result is transferred to another controller, controller control and compensation circuit working.。
As depicted in figs. 1 and 2, Active Power Filter-APF of the present utility model, comprises signal acquisition process device, response signal processor, signal sample circuit, inverse changing driving circuit and inverter circuit; Signal sample circuit connects signal acquisition process device; Signal acquisition process device connection response signal processor; Response signal processor connects inverter circuit by inverse changing driving circuit; Signal sample circuit and inverter circuit are electrically connected on power line.
Above-mentioned signal sample circuit is comprised of signal zero passage comparison circuit and current sampling circuit, signal zero passage comparison circuit input is connected on power line, signal zero passage comparison circuit output is electrically connected to current sampling circuit, and current sampling circuit is also connected on power line.Above-mentioned current sampling circuit is connected on signal acquisition process device by current-to-voltage converting circuit, and this current-to-voltage converting circuit consists of precision resistance, and the voltage by precision resistance two ends is sampling voltage.Above-mentioned inverter circuit is by three-phase full-controlled bridge drive circuit and three-phase full-controlled bridge the electric circuit constitute, and drive circuit consists of inverter and drive unit.
Active Power Filter-APF of the present utility model, input computing and control are controlled by separate controller respectively, guarantee the stability of filtering system; Improved the response time of filter simultaneously; Compensation effect is obvious; By two-shipper, work in addition, affected by electric network impedance little.
Embodiment recited above is described preferred implementation of the present utility model, not design of the present utility model and scope is limited.Do not departing under the prerequisite of the utility model design concept; various modification and improvement that this area ordinary person makes the technical solution of the utility model; all should drop into protection range of the present utility model; the technology contents that the utility model is asked for protection, is all documented in claims.
Claims (5)
1. an active filter, is characterized in that: comprise signal sample circuit, signal acquisition process device, response signal processor, inverse changing driving circuit and inverter circuit; Described signal sample circuit is comprised of signal zero passage comparison circuit and current sampling circuit, and signal zero passage comparison circuit output is electrically connected to current sampling circuit; Described current sampling circuit connects signal acquisition process device, signal acquisition process device connection response signal processor; Described response signal processor connects inverter circuit by inverse changing driving circuit, and described signal sample circuit and inverter circuit are connected electrically on power line respectively.
2. a kind of active filter according to claim 1, it is characterized in that: also comprise current-to-voltage converting circuit, described current-to-voltage converting circuit is between current sampling circuit and signal acquisition process device, and current sampling circuit connects signal acquisition process device by current-to-voltage converting circuit.
3. a kind of active filter according to claim 2, is characterized in that: described current-to-voltage converting circuit consists of precision resistance.
4. according to a kind of active filter described in claim 1 or 2 or 3, it is characterized in that, described inverter circuit is by three-phase full-controlled bridge drive circuit and three-phase full-controlled bridge the electric circuit constitute.
5. according to a kind of active filter described in claim 1 or 2 or 3, it is characterized in that, described drive circuit consists of inverter and drive unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420180355.9U CN203774793U (en) | 2014-04-14 | 2014-04-14 | Active filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420180355.9U CN203774793U (en) | 2014-04-14 | 2014-04-14 | Active filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203774793U true CN203774793U (en) | 2014-08-13 |
Family
ID=51291943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420180355.9U Expired - Fee Related CN203774793U (en) | 2014-04-14 | 2014-04-14 | Active filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203774793U (en) |
-
2014
- 2014-04-14 CN CN201420180355.9U patent/CN203774793U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20150414 |
|
| EXPY | Termination of patent right or utility model |