CN211209308U - C L C + L C filter circuit for active power filter - Google Patents
C L C + L C filter circuit for active power filter Download PDFInfo
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- CN211209308U CN211209308U CN202020196604.9U CN202020196604U CN211209308U CN 211209308 U CN211209308 U CN 211209308U CN 202020196604 U CN202020196604 U CN 202020196604U CN 211209308 U CN211209308 U CN 211209308U
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- inductor
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- active power
- inductance
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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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Abstract
The utility model relates to a C L C + L C filter circuit for active power filter, including three phase line, the phase line is established ties and is had first inductance L1, and the three angle of triangle electric capacity is connected respectively in three first inductance L1 one end, triangle electric capacity includes three first electric capacity C1, the one end that triangle electric capacity was connected to first inductance is established ties and is had second inductance L2 and third inductance L3, is connected second electric capacity C2 back ground connection GND between second inductance and the third inductance L3 the advantage that reduces the electric current impact to the bridge rectifier device.
Description
Technical Field
The utility model belongs to the technical field of active power filter technique and specifically relates to a C L C + L C filter circuit for active power filter is related to.
Background
An Active Power Filter (APF) is a new Power electronic device for dynamically suppressing harmonic waves and compensating reactive Power, and can compensate the harmonic waves with variable size and frequency and the reactive Power with variable size and frequency.
The active filter is called as active, and the device needs to provide power supply (for compensating the harmonic of the main circuit) as the name suggests, the application of the active filter can overcome the defects of the traditional harmonic suppression and reactive compensation methods (the traditional method can only carry out fixed compensation) such as L C filter, the dynamic tracking compensation is realized, and the harmonic and the reactive can be compensated.
When the current of the power grid is large, in addition to eliminating the harmonic wave, the current impact on the bridge stack device needs to be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a C L C + L C filter circuit for active power filter has the advantage that reduces the electric current impact to the bridge rectifier device.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a C L C + L C filter circuit for an active power filter comprises three phase lines and is characterized in that the phase lines are connected with a first inductor L1 in series, three angles of a triangular capacitor are respectively connected to one ends of the three first inductors L1, the triangular capacitor comprises three first capacitors C1, one end of the first inductor, which is connected with the triangular capacitor, is connected with a second inductor L2 and a third inductor L3 in series, and a second capacitor C2 is connected between the second inductor and the third inductor L3 and then grounded GND.
Furthermore, a first resistor is connected in parallel across the first capacitor C1.
Further, a first switch K1 is arranged between the phase line and the first inductor L1.
Furthermore, a second switch K2 is connected in parallel at two ends of the first switch K1, and a current limiting resistor R2 is connected in series on a branch where the second switch K2 is located.
Further, an electric fuse FU is connected in series between the first switch K1 and the phase line.
Further, a third resistor R3 is connected in series between the second capacitor C2 and the ground GND.
To sum up, the utility model discloses a following at least one useful technological effect: under the basic function of eliminating harmonic waves by the triangular capacitor, the circuit also has the function of reducing current impact on bridge stack devices.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, in order to the present invention, a C L C + L C filter circuit for an active power filter includes a L C circuit formed by three phase lines, a first inductor L1 and a triangular capacitor, and a L C L C circuit formed by a second inductor L2, a third inductor L3 and a second capacitor C2.
From the output end of the three-phase line, the phase line is connected with an electric fuse FU in series and then connected with a first switch K1 in series, a first inductor L1 is connected in series after the first switch K1, three corners of a three-phase capacitor are connected respectively after the first inductor L1, two ends of the first capacitor C1 are connected with a first resistor R1 in parallel, two ends of the first switch K1 are connected with a second switch K2 in parallel, and a branch where the second switch K2 is located is connected with a current-limiting resistor R2 in series.
The second inductor L2 and the third inductor L3 are connected in series behind the first inductor L1, and the second capacitor C2 is connected between the second inductor and the third inductor L3 and then the second resistor R2 is connected in series and grounded GND.
The implementation principle of the embodiment is as follows:
the electric fuse FU is fused when the current is too large so as to protect the electric appliance at the rear.
The current limiting resistor R2 is provided so that the inrush current flowing into the dc capacitor through the power converter is limited to a certain extent.
The L C filter circuit formed by the first inductor L1 and the first capacitor C1 can eliminate harmonic waves and compensate reactive power.
The first capacitor C1 and the first resistor R1 form a rc absorption protection circuit.
The L C L circuit formed by the second inductor L2, the third inductor L3 and the second capacitor C2 can eliminate harmonic waves and reduce current impact on rear bridge stack devices.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (6)
1. A C L C + L C filter circuit for an active power filter comprises three phase lines and is characterized in that the phase lines are connected with a first inductor L1 in series, three angles of a triangular capacitor are respectively connected to one ends of the three first inductors L1, the triangular capacitor comprises three first capacitors C1, one end of the first inductor, which is connected with the triangular capacitor, is connected with a second inductor L2 and a third inductor L3 in series, and a second capacitor C2 is connected between the second inductor and the third inductor L3 and then grounded GND.
2. The C L C + L C filter circuit as claimed in claim 1, wherein a first resistor is connected in parallel across the first capacitor C1.
3. The C L C + L C filter circuit for the active power filter as claimed in claim 1, wherein a first switch K1 is provided between the phase line and the first inductor L1.
4. The C L C + L C filter circuit for the active power filter as claimed in claim 3, wherein a second switch K2 is connected in parallel with two ends of the first switch K1, and a current limiting resistor R2 is connected in series on a branch where the second switch K2 is located.
5. The C L C + L C filter circuit for the active power filter as claimed in claim 3, wherein an electrical fuse FU is connected in series between the first switch K1 and the phase line.
6. The C L C + L C filter circuit for the active power filter as claimed in claim 1, wherein a third resistor R3 is connected in series between the second capacitor C2 and a ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020196604.9U CN211209308U (en) | 2020-02-23 | 2020-02-23 | C L C + L C filter circuit for active power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020196604.9U CN211209308U (en) | 2020-02-23 | 2020-02-23 | C L C + L C filter circuit for active power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211209308U true CN211209308U (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020196604.9U Active CN211209308U (en) | 2020-02-23 | 2020-02-23 | C L C + L C filter circuit for active power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211209308U (en) |
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2020
- 2020-02-23 CN CN202020196604.9U patent/CN211209308U/en active Active
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