CN218976350U - Novel three-phase hybrid active filter - Google Patents
Novel three-phase hybrid active filter Download PDFInfo
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- CN218976350U CN218976350U CN202223364977.0U CN202223364977U CN218976350U CN 218976350 U CN218976350 U CN 218976350U CN 202223364977 U CN202223364977 U CN 202223364977U CN 218976350 U CN218976350 U CN 218976350U
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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 discloses a novel three-phase hybrid active filter, which comprises a passive filtering unit and an active filtering unit, wherein the passive filtering unit is connected in series with the active filtering unit and then is connected between a three-phase alternating current power grid and a nonlinear load in parallel, and the passive filtering unit comprises three parallel resonance injection branches. The utility model utilizes the inductance and the capacitance to construct the injection branch of the specific subharmonic resonance to be compensated, and utilizes the characteristic of series resonance to improve the accuracy of harmonic compensation; the fundamental voltage born by the active filter unit is reduced by utilizing the partial pressure of the passive device, so that the capacity of the active filter unit is reduced. The utility model can compensate reactive power and specific subharmonic at the same time, and has the advantages of small system capacity, high compensation precision and high compensation efficiency; as a high-efficiency stable harmonic wave and reactive power control means, the method plays a key role in improving the electric energy quality of the electric power system.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to a novel three-phase hybrid active filter.
Background
The electric energy is the most widely applied energy at present, and the high-quality electric energy has important significance for promoting production and maintaining social stability. The popularization and use of the power electronic equipment bring great harmonic wave and reactive interference to the power system, and the power quality of the power system is reduced. The hybrid active filter is a combination of a passive filter and an active filter, combines the advantages of the passive filter and the active filter, is used as an efficient and stable harmonic wave and reactive power treatment means, and plays a key role in improving the electric energy quality of an electric power system.
The harmonic compensation capability of the APF is smaller due to the capacity limitation of the power semiconductor device, and in order to meet the requirement that harmonic and reactive power are required to be compensated simultaneously in certain occasions, a mode of combining the APF with the PF can be adopted. The core idea is to use PF to compensate reactive power, APF compensates harmonic wave, PF shares part of compensation capacity of APF, thus improving compensation capacity of APF. Compared with APF, PF has the remarkable advantages of simple structure and principle, easy realization, low cost, large capacity, etc., while APF has the advantages of high compensation precision and good dynamic performance. The hybrid active filter HAPF is formed by combining a passive filter PF and an active filter APF, and the HAPF combines the advantages of the passive filter PF and the active filter APF, so that the defects of high APF cost and low compensation capability are overcome, the system has good compensation characteristics, and reactive power can be compensated while harmonic wave is compensated, so that the hybrid active filter HAPF gradually becomes a research hot spot for reactive power compensation and harmonic wave suppression.
In the actual occasion that most of harmonic exceeds standard, after specific subcompensation is carried out on the harmonic with large content proportion, the harmonic content of the system can meet the requirement, so that the specific subharmonic compensation has obvious practical significance.
Disclosure of Invention
Aiming at the situations that the content of specific subharmonic in certain occasions is seriously out of standard and the reactive power of the system is insufficient, the utility model provides a novel three-phase hybrid active filter, an injection branch of the specific subharmonic resonance to be compensated is constructed by utilizing an inductor and a capacitor, and the precision of harmonic compensation is improved by utilizing the characteristic of series resonance; the fundamental voltage born by the active filter unit is reduced by utilizing the partial pressure of the passive device, so that the capacity of the active filter unit is reduced. The utility model can compensate reactive power and specific subharmonic at the same time, and has the advantages of small system capacity, high compensation precision and high compensation efficiency.
In order to achieve the above object, the present utility model adopts the following technical scheme.
The utility model provides a novel three-phase hybrid active filter, includes passive filter unit and active filter unit, passive filter unit with active filter unit connects in parallel again between three-phase AC electric wire netting and the nonlinear load after establishing ties, passive filter unit includes three parallel resonance injection branch road. The passive filter unit is composed of L 0 、C 0 、C 1 Is formed by series connection of L 0 、C 0 And C 1 Through reasonable arrangement of L 0 、C 0 And C 1 The voltage born by the active filter unit can be reduced, and the applicable voltage level of the hybrid active filter can be improved. The utility model can compensate reactive power and specific subharmonic at the same time, and has the advantages of small system capacity, high compensation precision and high compensation efficiency; as a high-efficiency stable harmonic wave and reactive power control means, the method plays a key role in improving the electric energy quality of the electric power system.
Preferably, the resonance injection branch comprises inductors L connected in series in turn 0 And capacitor C 0 The inductance L 0 Is connected with one end of the capacitor C 0 Is connected to one end of the connecting rod. Inductance L 0 Capacitance C 0 The resonance injection branch circuit generates series resonance to the compensated specific n-order harmonic, when the internal resistance of the component is ignored, the resonance branch circuit short-circuits the n-order harmonic, so that the compensated n-order harmonic current can be injected into the power grid without attenuation and phase shift, and can not be shunted to the capacitor C 1 The harmonic compensation accuracy is high and the efficiency is high.
Preferably, the resonance injection branch provides a channel for injecting harmonic compensation current emitted by the active filtering unit into a power grid. The utility model utilizes inductance and capacitance (inductance L 0 And capacitor C 0 ) An injection branch of specific subharmonic resonance to be compensated is constructed, and the accuracy of harmonic compensation is improved by utilizing the characteristic of series resonance.
Preferably, the capacitance C 0 The other end of (2) is connected with a capacitor C 1 . Capacitor C 1 The reactive current branch is provided, the reactive current is prevented from flowing through the active filtering unit, and the active filtering unit only needs to provide harmonic compensation current, so that the harmonic compensation capability of the hybrid active filter is improved.
Preferably, the capacitance C 1 For compensating reactive power and sharing fundamental voltage. The utility model utilizes passive devices (capacitor C 1 ) The voltage division of the active filter unit reduces the fundamental voltage to which the active filter unit is subjected, thereby reducing the capacity of the active filter unit.
Preferably, the active filter unit comprises three inductors L connected in parallel f Current transformer and capacitor C dc The three parallel inductors L f Is connected with the converter respectively, the DC side of the converter is connected with the capacitor C dc Connected in parallel.
Preferably, the three parallel inductors L f Respectively corresponding to the three parallel resonance injection branches, the three parallel inductances L f Respectively, with the first ends of the three parallel resonant injection branches (i.e. capacitor C 0 The other end of (c) is connected. Active filter unit and capacitor C 1 And the two resonant injection branches are connected in parallel and then connected in series to a power grid.
Preferably, the second ends of the three parallel resonant injection branches (i.e. the inductance L 0 And the other end of the three-phase alternating current network) are respectively connected to the corresponding electric phase branches in the three-phase alternating current network. Active filter unit and capacitor C 1 And the two resonant injection branches are connected in parallel and then connected in series to a power grid.
Therefore, the utility model has the advantages that:
(1) The reactive power and specific subharmonic can be compensated simultaneously, and the system has the advantages of small system capacity, high compensation precision and high compensation efficiency;
(2) An injection branch of specific subharmonic resonance to be compensated is constructed by using the inductance and the capacitance, and the accuracy of harmonic compensation is improved by using the characteristic of series resonance;
(3) The fundamental voltage born by the active filter unit is reduced by utilizing the partial pressure of the passive device, so that the capacity of the active filter unit is reduced; (4) As a high-efficiency stable harmonic wave and reactive power control means, the method plays a key role in improving the electric energy quality of the electric power system.
Drawings
Fig. 1 is a topological structure diagram of a novel three-phase hybrid active filter in an embodiment of the utility model.
1. The device comprises a passive filtering unit 2, an active filtering unit 3, a nonlinear load 4, a resonance injection branch 5 and a converter.
Detailed Description
The utility model is further described below with reference to the drawings and detailed description.
The utility model provides a novel three-phase hybrid active filter, as shown in fig. 1, including passive filter unit 1 and active filter unit 2, passive filter unit 1 and active filter unit 2 are unified and are connected in parallel between three-phase alternating current electric wire netting and nonlinear load 3 again after establishing ties, and passive filter unit 1 includes three parallel resonance injection branch road 4. The passive filter unit 1 is composed of L 0 、C 0 、C 1 Is formed by series connection of L 0 、C 0 And C 1 Through reasonable arrangement of L 0 、C 0 And C 1 The voltage borne by the active filter unit 2 can be reduced, and the applicable voltage level of the hybrid active filter of the utility model can be improved.
As shown in fig. 1, the resonant injection branch 4 comprises an inductance L serially connected in turn 0 And capacitor C 0 Inductance L 0 One end of (2) and a capacitor C 0 Is connected to one end of the connecting rod. Inductance L 0 Capacitance C 0 The resonance injection branch 4 generates series resonance to the compensated specific n-order harmonic, when the internal resistance of the component is ignored, the resonance branch short-circuits the n-order harmonic, so that the compensated n-order harmonic current can be injected into the power grid without attenuation and phase shift, and can not be shunted to the capacitor C 1 The harmonic compensation accuracy is high and the efficiency is high.
The resonance injection branch 4 provides a channel for injecting harmonic compensation current emitted by the active filter unit 2 into the power grid. The utility modelNovel use of inductance and capacitance (inductance L 0 And capacitor C 0 ) An injection branch of specific subharmonic resonance to be compensated is constructed, and the accuracy of harmonic compensation is improved by utilizing the characteristic of series resonance.
As shown in fig. 1, capacitor C 0 The other end of (2) is connected with a capacitor C 1 . Capacitor C 1 The reactive current branch is provided, so that reactive current is prevented from flowing through the active filtering unit 2, and the active filtering unit 2 only needs to provide harmonic compensation current, so that the harmonic compensation capability of the hybrid active filter is improved.
Capacitor C 1 For compensating reactive power and sharing fundamental voltage. The utility model utilizes passive devices (capacitor C 1 ) The divided voltage of the active filter unit 2 decreases the fundamental voltage to which the active filter unit 2 is subjected, thereby reducing the capacity of the active filter unit 2.
As shown in fig. 1, the active filter unit 2 comprises three inductors L connected in parallel f Converter 5 (inverter) and capacitor C dc Three parallel inductors L f Is connected to the current transformer 5, the DC side of the current transformer 5 and the capacitor C dc Connected in parallel.
As shown in fig. 1, three parallel inductors L f Corresponding to the three parallel resonant injection branches 4, respectively, three parallel inductors L f Respectively, with the first ends of the three parallel resonant injection branches 4 (i.e. the capacitor C 0 The other end of (a) is connected to the second ends of the three parallel resonant injection branches 4 (i.e. the inductance L) 0 The other end of (c) is respectively connected to each corresponding electric phase branch in the three-phase alternating current network. Active filter unit 2 and capacitor C 1 And the two resonant injection branches 4 are connected in parallel and then connected in series to a power grid.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The novel three-phase hybrid active filter is characterized by comprising a passive filtering unit and an active filtering unit, wherein the passive filtering unit is connected in series with the active filtering unit and then is connected between a three-phase alternating current power grid and a nonlinear load in parallel, and the passive filtering unit comprises three parallel resonance injection branches.
2. A novel three-phase hybrid active filter as claimed in claim 1, wherein said resonant injection branch comprises inductors L serially connected in sequence 0 And capacitor C 0 The inductance L 0 Is connected with one end of the capacitor C 0 Is connected to one end of the connecting rod.
3. A novel three-phase hybrid active filter according to claim 1 or 2, wherein the resonant injection branch provides a channel for injecting harmonic compensation current from the active filter unit into the grid.
4. A novel three-phase hybrid active filter according to claim 2, wherein the capacitor C 0 The other end of (2) is connected with a capacitor C 1 。
5. The novel three-phase hybrid active filter of claim 4, wherein said capacitor C 1 For compensating reactive power and sharing fundamental voltage.
6. A novel three-phase hybrid active filter as claimed in claim 1, wherein said active filter unit comprises three inductors L connected in parallel f Current transformer and capacitor C dc The three parallel inductors L f Is connected with the converter respectively, the DC side of the converter is connected with the capacitor C dc Connected in parallel.
7. A novel three-phase hybrid active filter as claimed in claim 6The device is characterized in that the three parallel inductors L f Respectively corresponding to the three parallel resonance injection branches, the three parallel inductances L f And the second ends of the three parallel resonant injection branches are respectively connected with the first ends of the three parallel resonant injection branches.
8. The novel three-phase hybrid active filter of claim 7, wherein the second ends of the three parallel resonant injection branches are each connected to a respective corresponding electrical phase branch in the three-phase ac power grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223364977.0U CN218976350U (en) | 2022-12-15 | 2022-12-15 | Novel three-phase hybrid active filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223364977.0U CN218976350U (en) | 2022-12-15 | 2022-12-15 | Novel three-phase hybrid active filter |
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| Publication Number | Publication Date |
|---|---|
| CN218976350U true CN218976350U (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223364977.0U Withdrawn - After Issue CN218976350U (en) | 2022-12-15 | 2022-12-15 | Novel three-phase hybrid active filter |
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| CN (1) | CN218976350U (en) |
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2022
- 2022-12-15 CN CN202223364977.0U patent/CN218976350U/en not_active Withdrawn - After Issue
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