CN107947177A - Based on H bridge hybrid active filters - Google Patents
Based on H bridge hybrid active filters Download PDFInfo
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- CN107947177A CN107947177A CN201711263225.6A CN201711263225A CN107947177A CN 107947177 A CN107947177 A CN 107947177A CN 201711263225 A CN201711263225 A CN 201711263225A CN 107947177 A CN107947177 A CN 107947177A
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- 238000006243 chemical reaction Methods 0.000 claims description 4
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- 230000009286 beneficial effect Effects 0.000 claims 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
-
- 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
-
- 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 one kind to be based on H bridge hybrid active filters.Passive filtering unit in present invention access power grid in parallel with harmonic source after connecting with active power filtering unit, since passive filtering unit includes single tuned filter, in addition to undertaking and filtering out load harmonic, undertake power grid fundamental voltage, reduce the fundamental voltage that active filter is born, reactive-load compensation can also be undertaken, and active power filtering unit can not only optimize outside passive filtering unit filtering characteristic, may also suppress power grid and passive filtering unit at the same time and resonance occur, there is provided insertion negative-sequence current mode solve the problems, such as that three alternate vertical compressions are unbalanced.
Description
Technical field
The present invention relates to power grid filtering technique and reactive-load compensation field, more particularly to a kind of H bridges mixed active that is based on to filter
Ripple device.
Background technology
Substantial amounts of nonlinear load access power grid causes harmonic pollution in electric power net seriously to cause network voltage to distort, and seriously affects
Distribution network electric energy quality, influences life and productive power safety and quality.Traditional passive LC wave filters by electrical network parameter influenced compared with
Greatly, when system impedance and frequency change, series parallel resonance can be produced with system impedance and capacitance and cause Harmonics amplification, active filter
Ripple device dynamic compensates load harmonic to be influenced from electrical network parameter, but there are capacity-constrained, is born fundamental voltage, be not suitable for high pressure
System harmonics are administered.It is active at present on the one hand fundamental voltage reduction to be born using passive filter using hybrid active filter
Filter capacity, on the other hand avoids going here and there simultaneously caused by electrical network parameter changes using active filter dynamic accurate compensation harmonic wave
Join resonance, wherein more universal Active filter is three-phase bridge inverter, born in mesohigh occasion vertical compression lateral capacitance
Vertical compression is higher.A kind of three alternate vertical compression side of H bridge inverters structure is separate, can cascaded H-bridges reduce the vertical compression side that undertakes of capacitance
Voltage, but there are three alternate vertical compression Balance route challenges.
The above is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that the above is existing skill
Art.
The content of the invention
It is a primary object of the present invention to provide one kind to be based on H bridge hybrid active filters, it is intended to solve the prior art
Middle harmonic treating apparatus capacity and the technical problem of performance and cost.
To achieve the above object, the present invention provides one kind and is based on H bridge hybrid active filters, described to be mixed based on H bridges
Type active filter includes：Passive filtering unit and active power filtering unit；
The active power filtering unit includes three H bridge modules, and the passive filtering unit includes three single tunings and filters mould
Block, each single tuning filter module correspond to a H bridge module respectively；
The left side bridge arm midpoint of each H bridge modules is connected with the first end of corresponding single tuning filter module, each H bridges mould
The right side bridge arm midpoint of block is connected with each other；
The second end of each single tuning filter module is connected with power grid and harmonic source respectively.
Preferably, each H bridge modules are made of insulated gate bipolar transistor IGBT respectively.
Preferably, each single tuning filter module is made of the capacitance and inductance that are connected in series respectively.
Preferably, it is described to be further included based on H bridge hybrid active filters：Drive control device, the drive control device
Sample circuit is connected with the harmonic source, and the drive circuit of the drive control device is connected with the active power filtering unit；
The drive control device, for obtaining the feedback current of the active power filtering unit by the sample circuit, and
Drive signal is generated with the feedback current according to total instruction current is compensated, and is believed based on the drive circuit by the driving
Number driving active power filtering unit.
Preferably, the drive control device, is additionally operable to calculate the output feedback current and the total instruction current of compensation
Between current differential, be multiplied by gain K to the current differential, obtain modulating wave, the driving is generated according to the modulating wave
Signal.
Preferably, the drive control device, is additionally operable to by the modulating wave compared with triangular wave, according to comparative result
Generate the drive signal.
Preferably, the compensation electric current always instruction is instructed by the load harmonic instruction current, active command electric current, negative phase-sequence
Electric current and reactive command electric current composition, the active command electric current are obtained by total vertical compression control module, total vertical compression control mould
Block is used for exchange side and the conversion of DC side active power is balanced, and the negative phase-sequence instruction current is stablized for alternate vertical compression, the nothing
Work(instruction current is the fundamental reactive current of passive filter compensation.
Preferably, the drive control device, is additionally operable to obtain the load harmonic current of the harmonic source, humorous to the load
Ripple electric current generates load harmonic instruction current by discrete Fourier transform DFT algorithms.
Passive filtering unit in present invention access power grid in parallel with harmonic source after connecting with active power filtering unit, due to nothing
Source filter unit includes single tuned filter, in addition to undertaking and filtering out load harmonic, undertakes power grid fundamental voltage, reduces active filter
The fundamental voltage that ripple device is born, can also undertake reactive-load compensation, and active power filtering unit can not only optimize the filter of passive filtering unit
Outside wave property, while may also suppress power grid and passive filtering unit and resonance occur, there is provided insertion negative-sequence current mode solve three
The alternate unbalanced problem of vertical compression.
Brief description of the drawings
Fig. 1 is the structure diagram based on H bridge hybrid active filters of the embodiment of the present invention；
Fig. 2 is the control principle drawing based on drive control device in H bridge hybrid active filters of the embodiment of the present invention；
Fig. 3 is the embodiment of the present invention based on harmonic compensation principle figure in H bridge hybrid active filters；
Fig. 4 is the embodiment of the present invention based on total vertical compression control principle drawing in H bridge hybrid active filters；
Fig. 5 is that being stablized based on alternate vertical compression in H bridge hybrid active filters for the embodiment of the present invention is inserted into negative-sequence current
Functional block diagram.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
With reference to Fig. 1, first embodiment of the invention provides one kind and is based on H bridge hybrid active filters, described to be mixed based on H bridges
Mould assembly active filter includes：Passive filtering unit 10 and active power filtering unit 20；
The active power filtering unit 20 includes three H bridge modules 200, and the passive filtering unit 10 includes three single tunings
Filter module 100, each single tuning filter module 100 correspond to a H bridge module 200 respectively；
The left side bridge arm midpoint of each H bridge modules 200 is connected with the first end of corresponding single tuning filter module 100, often
The right side bridge arm midpoint of a H bridge modules 200 is connected with each other, " N " point in tie point, that is, figure, i.e. is between three H bridge modules 200
Star connection；
The second end of each single tuning filter module 100 respectively with power grid (be " A ", " B " and " C " three end in figure) and humorous
Wave source 30 connects.
In the concrete realization, for ease of realizing active filter, in the present embodiment, each H bridge modules 200 are respectively by insulating
Grid bipolar transistor IGBT forms, and with reference to Fig. 1, each H bridge modules 200 are made of 4 IGBT and 1 capacitances respectively.
It should be noted that it is to realize single tuning filter function, in the present embodiment, each single tuning filter module 100 divides
It is not made of the capacitance and inductance that are connected in series.
Passive filtering unit in the present embodiment access power grid in parallel with harmonic source after connecting with active power filtering unit, due to
Passive filtering unit includes single tuned filter, in addition to undertaking and filtering out load harmonic, undertakes power grid fundamental voltage, reduces active
The fundamental voltage that wave filter is born, can also undertake reactive-load compensation, and active power filtering unit can not only optimize passive filtering unit
Outside filtering characteristic, while it may also suppress power grid and passive filtering unit generation resonance.
It is described to be had based on H bridge mixed types in the present embodiment for ease of being driven to the active filter with reference to Fig. 2
Source filter further includes：Drive control device 40, the sample circuit of the drive control device 40 is connected with the harmonic source 30, described
The drive circuit of drive control device 40 is connected with the active power filtering unit；The drive control device 40, for being adopted by described
Sample circuit obtains the feedback current of the active power filtering unit, and is driven according to total instruction current is compensated with feedback current generation
Dynamic signal, and the active power filtering unit is driven by the drive signal based on the drive circuit.
In the present embodiment, the drive control device 40, for obtaining the load harmonic current of the harmonic source 30, to described
Load harmonic current generates harmonic compensation current by discrete Fourier transform DFT algorithms and instructs, according to harmonic compensation electricity
Stream instruction always instructs a part as compensation electric current.
The drive control device 40, is additionally operable to generation drive signal, and the drive signal is sent to the active filter
Ripple device 20, is driven the active filter 20 with realizing.
In the present embodiment, the inner ring that controls of the drive control device is electric current loop, and outer shroud is Voltage loop, compensates total instruction electricity
The deviation that stream and feedback current subtract each other is multiplied with control gain K forms electric current loop, vertical compression side feedback voltage and instruction vertical compression difference
It is Voltage loop by proportional integration (PI) control.Wherein, the compensation electric current is always instructed by the load harmonic instruction current, had
Work(instruction current, negative phase-sequence instruction current and reactive command electric current composition, the active command electric current are obtained by total vertical compression control module
, total vertical compression control module is used for exchange side and the conversion of DC side active power is balanced, and the negative phase-sequence instruction current is used for
Alternate vertical compression is stablized, and the reactive command electric current is the fundamental reactive current of passive filter compensation.
Specifically, the drive control device 40, is additionally operable to calculate the output feedback current and the total instruction electricity of the compensation
Current differential between stream, is multiplied by the current differential gain K, obtains modulating wave, and the drive is generated according to the modulating wave
Dynamic signal.
Specifically, the drive control device 40, is additionally operable to by the modulating wave compared with triangular wave, is tied according to comparing
Fruit generates the drive signal.The compensation electric current is always instructed by the load harmonic instruction current, active command electric current, negative phase-sequence
Instruction current and reactive command electric current composition, the active command electric current are obtained by total vertical compression control module, total vertical compression control
Molding block is used for exchange side and the conversion of DC side active power is balanced, and the negative phase-sequence instruction current is stablized for alternate vertical compression, institute
State the fundamental reactive current that reactive command electric current is passive filter compensation.
It should be noted that drive control device described in the present embodiment is mainly wrapped based on the control that three H bridge stars connect vertical compression
Include total vertical compression control, three alternate vertical compression Balance routes of insertion negative sequence voltage compensation.Three alternate component variations and network voltage are not
Balance cause three alternate vertical compressions unbalanced, the synthesis of negative-sequence current and be inserted into compensation current-order in can offset three-phase injustice
The influence of weighing apparatus.
In the concrete realization, the drive control device 40, is additionally operable to obtain the load harmonic current of the harmonic source, to institute
State load harmonic current and load harmonic instruction current is generated by discrete Fourier transform DFT algorithms.
According to Fig. 3, the present embodiment gathers the load harmonic current I of the harmonic source by Current Transmit 1Labc(scheme
In " ILa”、“ILb" and " ILc"), it is sent into current sample module progress DFT and changes to obtain the amplitude of individual harmonic current and phase
Position, negates to obtain harmonic compensation current instruction, it is poor that the compensation current-order described in Fig. 2 and feedback current are made by IDFT changes
It is multiplied by gain K and obtains harmonic voltage UAPFh.Certain of harmonic voltage and filter branch harmonic impedance ZhProduce harmonic current Ifh, institute
State the harmonic current I produced based on H bridges hybrid active filterfhWith load harmonic current ILabcReversely, therefore described it is based on H
The reverse harmonic current of bridge hybrid active filter balances out harmonic current caused by harmonic source in power grid.
As shown in figure 4, a kind of total vertical compression control mode based on H bridge hybrid active filters is provided in the present embodiment
For：Since hybrid active filter has been connected passive LC filter, to power grid fundamental wave into capacitive, 90 ° of the advanced voltage on line side of electric current.
90 ° of phase sinwt of synchronized phase coswt and advanced power grid are mutually obtained to network voltage lock, sample power grid ABC three-phase vertical compressions
Respectively with reference voltage UdcrefSubtract each other and control to obtain three-phase watt current amplitude by PI, its three is added divided by 3 are averaged
Watt current Ipavr, IpavrRespectively with obtaining active command electric current I after the phase multiplication of advanced 90 ° of grid phasepabc(i.e. Ipa、
IpbAnd Ipc), with part active command electric current IpabcActive filter is acted on, it is produced the fundamental voltage U of same-phaseF,
Thus advanced electric current is multiplied to obtain active power maintenance exchange side and vertical compression side energy needed for the charging of vertical compression lateral capacitance with voltage
Exchange.
Above-mentioned Fig. 4, which provides total vertical compression control method, to be existed since exchange side imbalance of three-phase voltage, three-phase module device damage
Consumption difference and the difference of input pulse delay can cause three-phase vertical compression side vertical compression imbalance problem, as shown in Figure 5, there is provided one kind is negative
Sequence electric current synthesis mode is inserted it into the always instruction of compensation electric current, and control active filter output negative sequence voltage offsets net side three-phase
It is uneven：The real part I of negative phase-sequence instruction currentnrAmplitude is subtracted each other to obtain by the actual watt current of A phases and average watt current, and negative phase-sequence refers to
Make the imaginary part I of electric currentniAmplitude, which by C phase watt currents subtracts B phase watt currents and is multiplied by coefficient, to be obtained.Real part by the negative phase-sequence extracted
Negative phase-sequence instruction current I is exchanged with the synthesis of imaginary part amplitudena、Inb.C phase negative current instructions Inc=0-Ina-Inb.Three-phase negative/positive electric current
Instruct makes it produce existing when negative-sequence current offsets unbalanced power supply bear described in acting on based on H bridge hybrid active filters
Sequence electric current, the alternate capacitive absorption active power of equilibrium assignmen three, maintains three alternate vertical compression of active filter to stablize.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements not only include those key elements, and
And other elements that are not explicitly listed are further included, or further include as this process, method, article or system institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Also there are other identical element in the process of key element, method, article or system.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow shift that bright specification and accompanying drawing content are made, is directly or indirectly used in other relevant skills
Art field, is included within the scope of the present invention.
Claims (8)
1. one kind is based on H bridge hybrid active filters, it is characterised in that described to be included based on H bridge hybrid active filters：
Passive filtering unit and active power filtering unit；
The active power filtering unit includes three H bridge modules, and the passive filtering unit includes three single tuning filter modules, respectively
Single tuning filter module corresponds to a H bridge module respectively；
The left side bridge arm midpoint of each H bridge modules is connected with the first end of corresponding single tuning filter module, each H bridge modules
Right side bridge arm midpoint is connected with each other；
The second end of each single tuning filter module is connected with power grid and harmonic source respectively.
2. it is based on H bridge hybrid active filters as claimed in claim 1, it is characterised in that each H bridge modules are respectively by exhausted
Edge grid bipolar transistor IGBT forms.
3. it is based on H bridge hybrid active filters as claimed in claim 1, it is characterised in that each single tuning filter module
It is made of respectively the capacitance and inductance that are connected in series.
4. it is based on H bridge hybrid active filters Ru according to any one of claims 1 to 3, it is characterised in that described to be based on
H bridge hybrid active filters further include：Drive control device, the sample circuit of the drive control device and the harmonic source phase
Even, the drive circuit of the drive control device is connected with the active power filtering unit；
The drive control device, for the feedback current by the sample circuit acquisition active power filtering unit, and according to
Total instruction current and feedback current generation drive signal are compensated, and is driven based on the drive circuit by the drive signal
Move the active power filtering unit.
5. it is based on H bridge hybrid active filters as claimed in claim 4, it is characterised in that the drive control device, is also used
In calculating the current differential between the output feedback current and the total instruction current of compensation, increasing is multiplied by the current differential
Beneficial K, obtains modulating wave, and the drive signal is generated according to the modulating wave.
6. it is based on H bridge hybrid active filters as claimed in claim 5, it is characterised in that the drive control device, is also used
In compared with triangular wave, the modulating wave is generated the drive signal according to comparative result.
7. it is based on H bridge hybrid active filters as claimed in claim 4, it is characterised in that the compensation electric current always instructs
It is made of the load harmonic instruction current, active command electric current, negative phase-sequence instruction current and reactive command electric current, the active finger
Electric current is made to be obtained by total vertical compression control module, total vertical compression control module is used for exchange side and the conversion of DC side active power is equal
Weighing apparatus, the negative phase-sequence instruction current are stablized for alternate vertical compression, and the reactive command electric current is the base of passive filter compensation
Ripple reactive current.
8. it is based on H bridge hybrid active filters as claimed in claim 7, it is characterised in that the drive control device, is also used
In the load harmonic current for obtaining the harmonic source, the load harmonic current is given birth to by discrete Fourier transform DFT algorithms
Into load harmonic instruction current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711263225.6A CN107947177B (en) | 2017-12-01 | 2017-12-01 | H-bridge based hybrid active filter |
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| CN201711263225.6A CN107947177B (en) | 2017-12-01 | 2017-12-01 | H-bridge based hybrid active filter |
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| CN107947177A true CN107947177A (en) | 2018-04-20 |
| CN107947177B CN107947177B (en) | 2024-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030474A (en) * | 2019-12-26 | 2020-04-17 | 辽宁荣信兴业电力技术有限公司 | High-voltage cascaded harmonic power supply device and control method |
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| 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 |
-
2017
- 2017-12-01 CN CN201711263225.6A patent/CN107947177B/en active Active
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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030474A (en) * | 2019-12-26 | 2020-04-17 | 辽宁荣信兴业电力技术有限公司 | High-voltage cascaded harmonic power supply device and control method |
| CN111030474B (en) * | 2019-12-26 | 2023-05-05 | 辽宁荣信电力电子技术有限公司 | High-voltage cascading harmonic power supply device and control method |
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| CN107947177B (en) | 2024-03-12 |
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