CN107947177B - H-bridge based hybrid active filter - Google Patents
H-bridge based hybrid active filter Download PDFInfo
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- CN107947177B CN107947177B CN201711263225.6A CN201711263225A CN107947177B CN 107947177 B CN107947177 B CN 107947177B CN 201711263225 A CN201711263225 A CN 201711263225A CN 107947177 B CN107947177 B CN 107947177B
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- 238000001914 filtration Methods 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 10
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- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 4
- 238000011105 stabilization Methods 0.000 claims description 4
- 230000016507 interphase Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 abstract description 2
- 230000037431 insertion Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
-
- 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 Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a hybrid active filter based on an H bridge. The passive filter unit and the active filter unit are connected in parallel with the harmonic source and then connected into the power grid, and the passive filter unit comprises a single-tuning filter, so that the fundamental wave voltage of the power grid is reduced, the fundamental wave voltage born by the active filter is reduced, reactive compensation is also carried out, the active filter unit can optimize the filter characteristic of the passive filter unit, meanwhile, the power grid and the passive filter unit can be restrained from resonating, and the problem of unbalanced direct voltage among three phases is solved by the provided insertion negative sequence current mode.
Description
Technical Field
The invention relates to the field of power grid filtering technology and reactive compensation, in particular to a hybrid active filter based on an H bridge.
Background
The harmonic pollution of the power grid caused by the access of a large number of nonlinear loads to the power grid seriously causes the voltage distortion of the power grid, seriously influences the electric energy quality of the power distribution network, and influences the life and production electricity safety and quality. The traditional passive LC filter is greatly influenced by the parameters of the power grid, when the system impedance and the frequency change, series-parallel resonance is generated between the system impedance and the capacitor to cause harmonic amplification, and the active filter can dynamically compensate load harmonic waves without being influenced by the parameters of the power grid, but has capacity constraint, bears fundamental wave voltage and is not suitable for harmonic treatment of a high-voltage system. At present, a hybrid active filter is adopted, on one hand, the capacity of the active filter is reduced by using a passive filter to bear fundamental wave voltage, and on the other hand, the active filter is used for dynamically and accurately compensating harmonic waves to avoid series-parallel resonance caused by power grid parameter change, wherein the more common active filter structure is a three-phase bridge inverter, and the direct-voltage side capacitor bears higher direct voltage in medium-high voltage occasions. The direct voltage sides among three phases of the H-bridge inverter structure are mutually independent, and the direct voltage sides of the three phases of the H-bridge inverter structure can be cascaded to reduce the direct voltage side voltage born by a capacitor, but the problem of complex control of the direct voltage balance among the three phases exists.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide an H-bridge-based hybrid active filter, which aims to solve the technical problems of capacity, performance and cost of a harmonic treatment device in the prior art.
To achieve the above object, the present invention provides an H-bridge based hybrid active filter comprising: a passive filtering unit and an active filtering unit;
the active filtering unit comprises three H-bridge modules, the passive filtering unit comprises three single-tuning filtering modules, and each single-tuning filtering module corresponds to one H-bridge module respectively;
the middle point of the left bridge arm of each H-bridge module is connected with the first end of the corresponding single-tuning filter module, and the middle points of the right bridge arms of each H-bridge module are connected with each other;
the second end of each single-tuning filter module is connected with the power grid and the harmonic source respectively.
Preferably, each H-bridge module is composed of an insulated gate bipolar transistor IGBT, respectively.
Preferably, each single-tuned filter module is composed of a capacitor and an inductor connected in series, respectively.
Preferably, the H-bridge based hybrid active filter further comprises: the sampling circuit of the driving controller is connected with the harmonic source, and the driving circuit of the driving controller is connected with the active filtering unit;
the driving controller is used for obtaining the feedback current of the active filtering unit through the sampling circuit, generating a driving signal according to the compensation total instruction current and the feedback current, and driving the active filtering unit through the driving signal based on the driving circuit.
Preferably, the driving controller is further configured to calculate a current difference between the output feedback current and the compensated total command current, multiply the current difference by a gain K, obtain a modulated wave, and generate the driving signal according to the modulated wave.
Preferably, the driving controller is further configured to compare the modulated wave with a triangular wave, and generate the driving signal according to a comparison result.
Preferably, the compensation current total command is composed of the load harmonic command current, an active command current, a negative sequence command current and a reactive command current, wherein the active command current is obtained by a total direct voltage control module, the total direct voltage control module is used for active power conversion equalization of an alternating current side and a direct current side, the negative sequence command current is used for phase-to-phase direct voltage stabilization, and the reactive command current is fundamental reactive current compensated by the passive filter.
Preferably, the driving controller is further configured to obtain a load harmonic current of the harmonic source, and generate a load harmonic command current for the load harmonic current through a discrete fourier transform DFT algorithm.
The passive filter unit and the active filter unit are connected in parallel with the harmonic source and then connected into the power grid, and the passive filter unit comprises a single-tuning filter, so that the fundamental wave voltage of the power grid is reduced, the fundamental wave voltage born by the active filter is reduced, reactive compensation is also carried out, the active filter unit can optimize the filter characteristic of the passive filter unit, meanwhile, the power grid and the passive filter unit can be restrained from resonating, and the problem of unbalanced direct voltage among three phases is solved by the provided insertion negative sequence current mode.
Drawings
Fig. 1 is a block diagram of an H-bridge hybrid-based active filter according to an embodiment of the present invention;
FIG. 2 is a control schematic diagram of a drive controller in an H-bridge hybrid-based active filter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of harmonic compensation in an H-bridge based hybrid active filter according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of total direct voltage control in an H-bridge based hybrid active filter according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of a negative sequence current inserted in a phase-to-phase direct voltage stabilization based H-bridge hybrid active filter according to an embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a first embodiment of the present invention provides an H-bridge based hybrid active filter, the H-bridge based hybrid active filter comprising: a passive filtering unit 10 and an active filtering unit 20;
the active filtering unit 20 includes three H-bridge modules 200, the passive filtering unit 10 includes three single-tuned filtering modules 100, and each single-tuned filtering module 100 corresponds to one H-bridge module 200;
the middle point of the left side bridge arm of each H-bridge module 200 is connected with the first end of the corresponding single-tuning filter module 100, the middle points of the right side bridge arms of each H-bridge module 200 are connected with each other, and the connection point is an 'N' point in the figure, namely a star connection method is adopted among the three H-bridge modules 200;
the second end of each single-tuned filter module 100 is connected to the power grid (i.e., three ends "a", "B" and "C" in the figure) and the harmonic source 30, respectively.
In a specific implementation, in order to implement the active filter, in this embodiment, each H-bridge module 200 is respectively composed of an insulated gate bipolar transistor IGBT, and referring to fig. 1, each H-bridge module 200 is respectively composed of 4 IGBTs and 1 capacitor.
It should be noted that, in this embodiment, each single-tuned filter module 100 is respectively composed of a capacitor and an inductor connected in series to implement the single-tuned filter function.
The passive filter unit and the active filter unit are connected in parallel with the harmonic source and then connected into the power grid, and the passive filter unit comprises a single-tuning filter, so that the fundamental wave voltage of the power grid is reduced, the reactive compensation can be carried out, the filter characteristic of the passive filter unit can be optimized, and the resonance of the power grid and the passive filter unit can be restrained.
Referring to fig. 2, in order to facilitate driving the active filter, in this embodiment, the H-bridge hybrid-based active filter further includes: a driving controller 40, wherein a sampling circuit of the driving controller 40 is connected with the harmonic source 30, and a driving circuit of the driving controller 40 is connected with the active filtering unit; the driving controller 40 is configured to obtain a feedback current of the active filtering unit through the sampling circuit, generate a driving signal according to the compensated total command current and the feedback current, and drive the active filtering unit through the driving signal based on the driving circuit.
In this embodiment, the driving controller 40 is configured to obtain a load harmonic current of the harmonic source 30, generate a harmonic compensation current command for the load harmonic current through a discrete fourier transform DFT algorithm, and use the harmonic compensation current command as a part of a compensation current total command.
The driving controller 40 is further configured to generate a driving signal, and send the driving signal to the active filter 20, so as to drive the active filter 20.
In this embodiment, the inner control loop of the driving controller is a current loop, the outer loop is a voltage loop, the deviation of the subtraction of the compensation total command current and the feedback current is multiplied by the control gain K to form the current loop, and the feedback voltage at the direct voltage side and the command direct voltage difference value are controlled to be the voltage loop through Proportional Integral (PI). The compensation current total command consists of the load harmonic command current, the active command current, the negative sequence command current and the reactive command current, wherein the active command current is obtained by a total direct voltage control module, the total direct voltage control module is used for balancing active power conversion of an alternating current side and a direct current side, the negative sequence command current is used for stabilizing interphase direct voltage, and the reactive command current is fundamental wave reactive current compensated by the passive filter.
Specifically, the driving controller 40 is further configured to calculate a current difference between the output feedback current and the compensated total command current, multiply the current difference by a gain K, obtain a modulated wave, and generate the driving signal according to the modulated wave.
Specifically, the driving controller 40 is further configured to compare the modulated wave with a triangular wave, and generate the driving signal according to a comparison result. The compensation current total instruction consists of the load harmonic instruction current, the active instruction current, the negative sequence instruction current and the reactive instruction current, wherein the active instruction current is obtained by a total direct voltage control module, the total direct voltage control module is used for active power conversion balance of an alternating current side and a direct current side, the negative sequence instruction current is used for interphase direct voltage stabilization, and the reactive instruction current is fundamental wave reactive current compensated by the passive filter.
It should be noted that, in this embodiment, the control of the driving controller based on three H-bridge star connection direct voltages mainly includes total direct voltage control and three-phase inter-direct voltage balance control with negative sequence voltage compensation inserted. The direct voltage unbalance among the three phases caused by the device difference among the three phases and the unbalanced voltage of the power grid is generated, and the negative sequence current is synthesized and inserted into a compensation current command to offset the influence of the unbalanced three phases.
In a specific implementation, the driving controller 40 is further configured to obtain a load harmonic current of the harmonic source, and generate a load harmonic command current for the load harmonic current through a discrete fourier transform DFT algorithm.
Referring to fig. 3, the present embodiment collects the load harmonic current I of the harmonic source through a current transformer CT1 Labc (i.e. "I" in the figure La ”、“I Lb "AND" I Lc ") into a current sampling module to perform DFT change to obtain amplitude and phase of each subharmonic current, performing IDFT change inversion to obtain a harmonic compensation current command, and multiplying the difference between the compensation current command and the feedback current shown in figure 2 by a gain K to obtain a harmonic voltage U APFh . Harmonic voltage and certain subharmonic impedance Z of filtering branch h Generating harmonic current I fh Harmonic current I generated by the H-bridge hybrid-type active filter fh With load harmonic current I Labc Reverse direction, so the reverse harmonic current based on the H-bridge hybrid active filter counteracts power failureHarmonic currents caused by harmonic sources in the net.
As shown in fig. 4, in this embodiment, a total direct voltage control manner based on an H-bridge hybrid active filter is provided as follows: because the hybrid active filter is connected in series with the passive LC filter, the current leads the network side voltage by 90 degrees for the fundamental wave of the power network to be capacitive. The grid voltage is phase-locked to obtain a grid synchronous phase coswt and an advanced grid 90-degree phase sinwt, and the sampled grid ABC three-phase direct voltage is respectively connected with a reference voltage U dcref The three phases of active current amplitude values are obtained after subtraction and PI control, and the three phases of active current amplitude values are added and divided by 3 to obtain average active current I pavr ，I pavr The active command current I is obtained after the phase multiplication of the active command current I and the phase of the advanced power grid phase 90 DEG respectively pabc (i.e. I pa 、I pb And I pc ) With the part of the active command current I pabc Acting on active filter to generate same phase fundamental wave voltage U F The current and the voltage advanced by the current and the voltage are multiplied to obtain the active power required by the charging of the direct-voltage side capacitor to maintain the energy exchange between the alternating-current side and the direct-voltage side.
The total direct voltage control method provided in fig. 4 above has the problem that the direct voltage unbalance of the three-phase direct voltage side is caused by the unbalance of the three-phase voltage of the alternating current side, the loss difference of the three-phase module device and the delay difference of the input pulse, as shown in fig. 5, a negative sequence current synthesis mode is provided to be inserted into the total command of the compensation current, and the active filter is controlled to output the negative sequence voltage to counteract the three-phase unbalance of the network side: the real part I of the negative sequence instruction current nr The amplitude is obtained by subtracting the average active current from the actual active current of the phase A, and the imaginary part I of the negative sequence instruction current ni The amplitude is obtained by subtracting the B phase active current from the C phase active current and multiplying the coefficient. Synthesizing an alternating negative sequence instruction current I by the amplitude of the real part and the imaginary part of the extracted negative sequence na 、I nb . C-phase negative sequence current instruction I nc ＝0-I na -I nb . The three-phase negative sequence current instruction acts on the H-bridge-based hybrid active filter to enable the H-bridge-based hybrid active filter to generate negative sequence current to offset the negative sequence current existing when the power grid is unbalanced, and the three-phase capacitors are distributed in a balanced mode to absorb active power, so that the direct voltage among the three phases of the active filter is kept stable.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (4)
1. An H-bridge based hybrid active filter, the H-bridge based hybrid active filter comprising: a passive filtering unit and an active filtering unit;
the active filtering unit comprises three H-bridge modules, the passive filtering unit comprises three single-tuning filtering modules, and each single-tuning filtering module corresponds to one H-bridge module respectively;
the middle point of the left bridge arm of each H-bridge module is connected with the first end of the corresponding single-tuning filter module, and the middle points of the right bridge arms of each H-bridge module are connected with each other;
the second end of each single-tuning filter module is connected with a power grid and a harmonic source respectively;
each H-bridge module consists of four insulated gate bipolar transistors IGBT and a capacitor;
each single-tuning filter module consists of a capacitor and an inductor which are connected in series;
the H-bridge based hybrid active filter further comprises: the sampling circuit of the driving controller is connected with the harmonic source, and the driving circuit of the driving controller is connected with the active filtering unit;
the driving controller is used for obtaining the feedback current of the active filtering unit through the sampling circuit, generating a driving signal according to the compensation total instruction current and the feedback current, and driving the active filtering unit through the driving signal based on the driving circuit;
the compensation total command current consists of a load harmonic command current, an active command current, a negative sequence command current and a reactive command current, wherein the active command current is obtained by a total direct voltage control module, the total direct voltage control module is used for active power conversion balance of an alternating current side and a direct current side, the negative sequence command current is used for interphase direct voltage stabilization, and the reactive command current is fundamental wave reactive current compensated by the passive filter;
the real part I of the negative sequence instruction current nr The amplitude is obtained by subtracting the average active current from the A-phase actual active current of the power grid, and the imaginary part I of the negative sequence instruction current ni The amplitude is obtained by subtracting the B-phase active current of the power grid from the C-phase active current of the power grid and multiplying the B-phase active current of the power grid by a coefficient.
2. The H-bridge hybrid-based active filter of claim 1, wherein the drive controller is further configured to calculate a current difference between the feedback current and the compensated total command current, multiply the current difference by a gain K to obtain a modulated wave, and generate the drive signal based on the modulated wave.
3. The H-bridge hybrid-based active filter of claim 2, wherein the drive controller is further configured to compare the modulated wave with a triangular wave and generate the drive signal based on the comparison.
4. The H-bridge hybrid-based active filter of claim 1, wherein the drive controller is further configured to obtain a load harmonic current of the harmonic source, and generate a load harmonic command current for the load harmonic current by a discrete fourier transform DFT algorithm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159379A (en) * | 2007-04-30 | 2008-04-09 | 湖南大学 | Mixed active electric power filter and direct current side voltage control method thereof |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
| CN104852379A (en) * | 2015-05-14 | 2015-08-19 | 电子科技大学 | Instruction compensation control method of active power filter |
| CN207426700U (en) * | 2017-12-01 | 2018-05-29 | 武汉科力源电气有限公司 | Based on H bridge mixed active filter circuits |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101159379A (en) * | 2007-04-30 | 2008-04-09 | 湖南大学 | Mixed active electric power filter and direct current side voltage control method thereof |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
| CN104852379A (en) * | 2015-05-14 | 2015-08-19 | 电子科技大学 | Instruction compensation control method of active power filter |
| CN207426700U (en) * | 2017-12-01 | 2018-05-29 | 武汉科力源电气有限公司 | Based on H bridge mixed active filter circuits |
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