CN207117182U - A kind of active tuning type compound filter of transformer coupled and separated exciting - Google Patents
A kind of active tuning type compound filter of transformer coupled and separated exciting Download PDFInfo
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- CN207117182U CN207117182U CN201721053756.8U CN201721053756U CN207117182U CN 207117182 U CN207117182 U CN 207117182U CN 201721053756 U CN201721053756 U CN 201721053756U CN 207117182 U CN207117182 U CN 207117182U
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 39
- 230000005284 excitation Effects 0.000 claims abstract description 48
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 52
- 238000001914 filtration Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 241000813267 Tragopogon major Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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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
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
It the utility model is related to a kind of active tuning type compound filter of transformer coupled and separated exciting, including separate excitation power supply SES, active filter APF and passive filter PPF, passive filter PPF includes a filter condenser C and a filter reactor L, filter condenser C and filter reactor L series connection；Separate excitation power supply SES output is connected to active filter APF DC side, and active filter APF output end is parallel to passive filter PPF filter reactor L both ends by coupling transformer T；Separate excitation power supply SES and active filter APF uses the voltage source converter circuit based on insulated gate bipolar transistor IGBT and PWM modulation technology.Compensation performance of the present utility model is more preferable, control structure is simpler；Major avenues of approach of the passive filter PPF branch roads as load harmonic, and active filter APF then plays tuning control action, Passive LC filter branch is played good filter action to selected multiple specific subharmonic.
Description
Technical field
The utility model belongs to electric filtering technical field, and in particular to a kind of active tuning of transformer coupled and separated exciting
Type compound filter.
Background technology
It is humorous in electric power system with the extensive use of high-capacity industrial power electronic equipment and office buildings electronic equipment
Ripple pollutes getting worse, have impact on the safe operation electrically with electronic equipment, also increases the electric energy loss of power network.Therefore,
Widely used electric-power filter is needed to administer mains by harmonics in power system.Electric-power filter be divided into passive power filter,
The mixed electric power filter that Active Power Filter-APF and both combination form.
The passive filter or active filter of exclusive use in actual applications all there is it is respective the problem of.Passive filter
Ripple device is simple in construction, cost is cheap and has the double action of harmonics restraint and reactive-load compensation, but is commonly present compared with large detuning, filtering
The difficult people's will to the greatest extent of effect；Active filter can play good filter action to less than 25 times harmonic waves, strong environmental adaptability, but by
Limited in by power electronic devices voltage and current level, the problem of voltage is low, capacity is small be present.Compound filter is by nothing
Source filter and active filter, which organically combine, to be formed, and under the regulation of low capacity active power filtering, can significantly improve high pressure great Rong
The performance of passive filter is measured, is the developing direction of electric-power filter technology.
Substantial amounts of research work is done to compound filter both at home and abroad, it is proposed that a variety of typical electricals of compound filter
Road topological structure, its purpose are all to reduce the fundamental voltage that active filter is born.A kind of Chinese invention patent " active tuning
Type compound filter and the control method (ZL 201110133131.3) for carrying out active tuning " proposes a kind of new mixing filter
The structure and its control method of ripple device, further solves the problems, such as sample of signal, individual-phase control harmonic current-limiting protection；Its structure
It can be as depicted in figs. 1 and 2 circuit topological structure and the control of active tuning type compound filter respectively to pass through evolution with principle
Method schematic diagram processed, wherein, Fig. 1 is main circuit topology, and Fig. 2 is the theory diagram of its control system.But above-mentioned patent uses
The self-excitation type active filter of three-phase independence, in compensation harmonic, DC voltage fluctuation is larger, have impact on filter effect, this
The former secondary voltage phase difference of outer coupling transformer also have impact on the self-excitation control performance of DC voltage, also result in active filter
The control structure of ripple device is also complex.
The content of the invention
The purpose of this utility model is to overcome problems of the prior art, there is provided a kind of transformer coupled and separate excitation
The active tuning type compound filter of formula, good wave filtering effect, control structure are simple.
In order to achieve the above object, the utility model wave filter adopts the following technical scheme that：
Including separate excitation power supply SES, active filter APF and passive filter PPF, passive filter PPF includes a filter
Ripple capacitor C and a filter reactor L, filter condenser C and filter reactor L series connection；Separate excitation power supply SES output is connected to
Active filter APF DC side, active filter APF output end are parallel to passive filter PPF by coupling transformer T
Filter reactor L both ends；
Separate excitation power supply SES and active filter APF is used and is based on insulated gate bipolar transistor IGBT and PWM skill
The voltage source converter circuit of art.
Further, active filter APF uses the Single-Phase Voltage-Source Inverters based on IGBT device and PWM modulation technology
Circuit.
Further, separate excitation power supply SES is whole using the three-phase based on IGBT device and PWM modulation technology or single-phase electricity potential source
Flow device circuit.
Further, in addition to current detector TA1, current detector TA2, voltage detector TV1, voltage detector
TV2, current detecting unit I, current detecting unit II, voltage detection unit I, voltage detection unit II, Harmonic currents detection list
Member, off resonance degree detection unit, multiple-harmonic adjuster, weighting filter, PWM generator I, current detector TA3, current detecting list
First III, voltage detector TV3, voltage detection unit III, comparing unit, voltage regulator and PWM generator II,
Voltage detector TV3 primary side is connected to separate excitation power supply SES DC side, voltage detector TV3 secondary side
Access in voltage detection unit III；Voltage detection unit III output and comparing unit input connect；Compare list
Another input of member is given direct voltage reference value；Comparing unit access voltage regulator, voltage regulator it is defeated
Go out the input terminated into PWM generator II；
Current detector TA3 primary side is serially connected with separate excitation power supply SES AC, current detector TA3 secondary side
Access in current detecting unit III；Current detecting unit III access PWM generators II another input, PWM generator
II output end is directly connected with the IGBT device in separate excitation power supply SES；
Current detector TA1 primary side is connected with filter reactor L outer ends, current detector TA1 secondary side access
In current detecting unit I；Current detector TA2 primary side is series in active filter APF output loop, current detecting
In device TA2 secondary side access current detecting unit II；Voltage detector TV1 primary side is connected to passive filter PPF filter
Ripple capacitor C both ends, voltage detector TV2 primary side are connected to passive filter PPF filter reactor L both ends, voltage inspection
Survey in device TV1 secondary side access voltage detection unit II, in voltage detector TV2 secondary side access voltage detection unit I；
Voltage detection unit I and voltage detection unit II output end are all connected to off resonance degree detection unit；Current detecting
In unit I output end access Harmonic currents detection unit, the output end of Harmonic currents detection unit accordingly accesses weighting filter
In ripple device；
Current detecting unit I output end and the input with multiple-harmonic adjuster simultaneously of the output end of off resonance degree detection unit
The corresponding connection in end, the output end of multiple-harmonic adjuster are accordingly connected with the input of weighting filter；Weighting filter it is defeated
Go out the input terminated into PWM generator I；
Current detecting unit II access PWM generators I another input, PWM generator I output end is directly with having
IGBT device in source filter APF is connected.
Further, current detector TA1, current detector TA2 and current detector TA3 are current transformer.
Further, voltage detector TV1 and voltage detector TV2 is voltage transformer, and voltage detector TV3 is straight
Flow voltage hall sensor.
Compared with prior art, the utility model has technique effect beneficial below：
The utility model compound filter is by improving existing active tuning type compound filter, by active filter
Ripple device APF output is parallel to passive filter PPF filter reactor L both ends by coupling transformer, and active power filtering
The DC voltage of device is then controlled by separate excitation power supply SES so that the compensation of the active tuning type compound filter of the utility model
Performance is more preferable, control structure is simpler；Major avenues of approach of the passive filter PPF branch roads as load harmonic, and active filter
APF then plays tuning control action, Passive LC filter branch is played good filtering to selected multiple specific subharmonic
Effect；The utility model has further the advantage that：
1) the characteristics of maintaining existing active tuning type compound filter；
2) active filter APF DC voltage is supported by separate excitation power supply SES, and DC voltage is not filtered by single-phase active
The influence of ripple device output compensation electric current, filtering performance are more preferable；
3) active filter APF DC voltage is not influenceed by passive filter PPF parameter configurations；
4) active filter APF DC voltages are not influenceed by coupling transformer original secondary voltage phase difference.
Further, separate excitation power supply SES uses three-phase or single-phase electricity potential source rectifier circuit in the utility model, meets not
Same power requirement.
Brief description of the drawings
Fig. 1 is the structural representation of existing active tuning type compound filter (employing coupling transformer)；
Fig. 2 is the control principle block diagram of existing active tuning type compound filter；
Fig. 3 is the structural representation of the active tuning type compound filter of of the present utility model transformer coupled and separated exciting；
Fig. 4 is the control principle frame of the active tuning type compound filter of of the present utility model transformer coupled and separated exciting
Figure；
The DC voltage real-time simulation ripple of separate excitation power supply SES outputs when Fig. 5 is active filter APF output compensation electric currents
Shape；
Fig. 6 is the preceding power network current real-time simulation waveform with after compensation of compound filter compensation；
Fig. 7 is the spectrogram of power network current waveform before compound filter compensation；
Fig. 8 is the spectrogram of power network current waveform after compound filter compensation.
Embodiment
The utility model is described in further details below in conjunction with the accompanying drawings.
Reference picture 3 and Fig. 4, the structure of separated exciting compound filter of the present utility model be, including separate excitation power supply SES, has
Source filter APF and passive filter PPF, separate excitation power supply SES and active filter APF, which are used, is based on insulated gate bipolar crystal
Pipe IGBT and PWM modulation technology voltage source converter circuit, specifically active filter APF use based on IGBT device and
The Single-Phase Voltage-Source Inverters circuit of PWM modulation technology；Separate excitation power supply SES is used based on IGBT device and PWM modulation technology
Three-phase voltage source rectifier circuit, because separate excitation power is small, it can also use single-phase electricity potential source rectifier circuit.
Passive filter PPF is in series including an a filter condenser C and filter reactor L；Separate excitation power supply SES
Ac input end low-voltage power supply is connected to by current-limiting reactor；Separate excitation power supply SES DC output end is directly accessed
Active filter APF DC side, provide stable DC voltage to active filter APF by separate excitation power supply SES and support；Have
Source filter APF ac output end is parallel to passive filter PPF filter reactor L both ends by coupling transformer T.
Major avenues of approach of the passive filter PPF branch roads as load harmonic, and active filter APF then plays tuning control action, makes
Passive LC filter branch can play good filter action to selected multiple specific subharmonic.
Reference picture 4, current detector TA1, current detector are also included in the utility model separated exciting compound filter
TA2, current detector TA3, voltage detector TV1, voltage detector TV2 and voltage detector TV3；Separated exciting compound filter
In also include current detecting unit I, Harmonic currents detection unit, voltage detection unit I, voltage detection unit II, off resonance degree inspection
Unit, multiple-harmonic adjuster, weighting filter, current detecting unit II, PWM generator I are surveyed, voltage detection unit III, is compared
Unit, voltage regulator, current detecting unit III and PWM generator II.
Current detector TA1 and current detector TA2 is current transformer, current detector TA1 primary side and LC
The filter reactor L outer ends series connection of passive filtering branch road, current detector TA1 secondary side are accessed in current detecting unit I；Electricity
Current sensor TA2 primary side is series in active filter APF output loop, current detector TA2 secondary side access
In current detecting unit II；Voltage detector TV1 and voltage detector TV2 is voltage transformer, and the one of voltage detector TV1
Secondary side joint is connected to Passive LC filtering branch in the filter condenser C both ends of Passive LC filter branch, voltage detector TV2 primary side
The filter reactor L both ends on road, voltage detector TV1 secondary side are accessed in voltage detection unit II, voltage detector TV2's
In secondary side access voltage detection unit I.
Current detector TA3 is current transformer, and current detector TA3 primary side is series at separate excitation power supply SES friendship
Flow side (in ac circuit), in current detector TA3 secondary side access current detector III；Voltage detector TV3 is direct current
Voltage hall sensor, voltage detector TV3 primary side are connected to separate excitation power supply SES DC side, voltage detector TV3's
In secondary side access voltage detection unit III.
Voltage detection unit I output end is connected with an input of off resonance degree detection unit；Voltage detection unit II
Output end be connected with another input of off resonance degree detection unit；Current detecting unit I output end access harmonic current
In detection unit, the output end of Harmonic currents detection unit is accordingly accessed in weighting filter.
Current detecting unit I output end is connected with the respective input of multiple-harmonic adjuster simultaneously, and the detection of off resonance degree is single
The output end and the input of multiple-harmonic adjuster of member connect one to one according to overtone order；The output end of multiple-harmonic adjuster
Connected one to one with the input of weighting filter according to overtone order；The output end access PWM generator I of weighting filter
An input.
Current detecting unit II access PWM generators I another input, is primarily used to detect active filter
The actual compensating current signal that APF is issued；PWM generator I output end directly with the IGBT devices in active filter APF
Part is connected.
One input of voltage detection unit III and comparing unit connects, for picking up separate excitation power supply SES DC side
Voltage signal；Another input of comparing unit is the direct voltage reference value given in software program；Comparing unit it is defeated
Go out and access voltage regulator, the output end access PWM generator II of a voltage regulator input.
Current detecting unit III access PWM generators II another input, is primarily used to detect separate excitation power supply
SES current on line side signal；PWM generator II output end is directly connected with the IGBT device in separate excitation power supply SES.
Reference picture 4, the utility model is for the active tuning type compound filter of transformer coupled and separated exciting shown in Fig. 3
The active tuning control method carried out, including the tuning control of active filter and the DC voltage-stabilizing of separate excitation power supply control, according to
Following steps are implemented：
Step 1) is by the active tuning type compound filter of of the present utility model transformer coupled and separated exciting and required progress
The nonlinear-load of filtering is in parallel, or the active tuning type compound filter of of the present utility model transformer coupled and separated exciting is straight
Connect and be connected in the power distribution network for needing to filter；
Step 2) detects to separate excitation power supply SES VD by voltage detector TV3, passes through voltage
Detection unit III obtains separate excitation power supply SES DC voltage actual value Udc, by separate excitation power supply obtained by voltage detection unit III
SES DC voltage actual value UdcWith DC voltage setting value Udc.ref, by comparing unit and voltage regulator, by UdcWith
Udc.refDifference carry out PI regulations, instruction current is of the generation separate excitation power supply SES under unity power factorSES.ref；
Step 3) separate excitation power supply SES actual output current after over-current detector TA3 and current detecting unit III,
Obtain separate excitation power supply SES actual current signal iSES.real；
Step 4) is by separate excitation power supply SES instruction current iSES.refWith separate excitation power supply SES actual output current signal
iSES.real, after PWM generator II processing, produce the PWM drive signal for the IGBT for forming separate excitation power supply SES, so far, separate excitation
Power supply SES will provide the unity power factor that steady dc voltage supports and obtain AC for active filter APF, have
Improve the benefit of the power network quality of power supply and energy-conservation；The acquisition of unity power factor is realized by SES control strategy.
Step 5) is by current detector TA1, voltage detector TV1 and voltage detector TV2, respectively to passive filter
Electric current, condenser voltage and reactor voltage in PPF branch roads are detected, and obtain corresponding current and voltage signals if、uCWith
uL；
Electric current i in step 6) passive filter PPF branch roadsfBy Harmonic currents detection, obtain intending each single filtered out
Harmonic current components ih.1~ih.m；
Step 7) is to condenser voltage u in passive filter PPF branch roadsCWith reactor voltage uL, pass through the detection point of off resonance degree
Analysis calculates passive filter PPF and is intending filtering out the off resonance degree d under harmonic frequencyh.1~dh.m；
The off resonance degree d that step 8) is obtained by step 7h.1~dh.m, by multiple-harmonic adjuster, generation harmonic compensation current adds
Weight coefficient k1~km；
Step 9) is by weighting filter, according to harmonic current components ih.1~ih.mWith weight coefficient k1~kmIt is weighted
Summation process, form active filter APF harmonic compensation current instruction iAPF.ref；
Step 10) active filter APF actual output current is through over-current detector TA2 and current detecting unit II
Afterwards, active filter APF actual output current signal i is obtainedAPF.real；
Step 11) is by active filter APF instruction current iAPF.refBelieve with active filter APF actual output current
Number iAPF.real, after PWM generator I processing, the PWM drive signal for the IGBT for forming active filter APF is produced,.
The DC voltage real-time simulation waveform of separate excitation power supply output when Fig. 5 show active filter output compensation electric current,
It can be seen that no matter whether active filter APF outputs compensate electric current, separate excitation power supply SES can provide steady dc voltage support；
Fig. 6 is the preceding power network current real-time simulation waveform with after compensation of compound filter compensation, and Fig. 7 is power network before compound filter compensation
The spectrogram of current waveform, Fig. 8 are the spectrogram of power network current waveform after compound filter compensation, and control compensates front and rear power network
Current waveform and its frequency spectrum, it is seen that the filtering of the active tuning type compound filter of of the present utility model transformer coupled and separated exciting
Excellent effect.
The utility model wave filter, solving the active filter in the presence of prior art should control harmonic compensation electric
Stream again control DC voltage influence each other and complexity problem.
In the utility model, compound filter is parallel to nonlinear-load power network；To separate excitation power supply exploiting entity power
Factor and DC voltage-stabilizing control, steady dc voltage support is provided for active filter APF；Obtained by Harmonic currents detection
Intend the individual harmonic current filtered out；It is humorous by the way that the detection calculations of filter condenser voltage and filter reactor voltage are obtained with each time
Off resonance degree under wave frequency rate；Generation harmonic compensation current weight coefficient is controlled by tuning；Individual harmonic current is weighted
Summation can form active filter APF harmonic compensation current instruction；Instruction current and actual output current are sent out by PWM
After raw device processing, generation PWM drive signal.Significant effect of the present utility model, stable and reliable operation.The utility model exists
In active tuning type compound filter, active filter APF control is simplified, avoids the former secondary of isolating transformer introducing
Influence of the voltage phase difference to DC voltage control, improve the stability and filtering property of active filter DC voltage
Energy.
Claims (6)
- A kind of 1. active tuning type compound filter of transformer coupled and separated exciting, it is characterised in that：Including separate excitation power supply SES, Active filter APF and passive filter PPF, passive filter PPF include a filter condenser C and a filter reactor L, filter condenser C and filter reactor L connect；Separate excitation power supply SES output is connected to active filter APF DC side, has Source filter APF output end is parallel to passive filter PPF filter reactor L both ends by coupling transformer T；Separate excitation power supply SES and active filter APF is used based on insulated gate bipolar transistor IGBT and PWM modulation technology Voltage source converter circuit.
- 2. one kind according to claim 1 is transformer coupled and the active tuning type compound filter of separated exciting, its feature exist In：Active filter APF uses the Single-Phase Voltage-Source Inverters circuit based on IGBT device and PWM modulation technology.
- 3. one kind according to claim 1 is transformer coupled and the active tuning type compound filter of separated exciting, its feature exist In：Separate excitation power supply SES uses three-phase or single-phase electricity potential source rectifier circuit based on IGBT device and PWM modulation technology.
- 4. one kind according to claim 1 is transformer coupled and the active tuning type compound filter of separated exciting, its feature exist In：Also include current detector TA1, current detector TA2, voltage detector TV1, voltage detector TV2, current detecting unit I, current detecting unit II, voltage detection unit I, voltage detection unit II, Harmonic currents detection unit, the detection of off resonance degree are single Member, multiple-harmonic adjuster, weighting filter, PWM generator I, current detector TA3, current detecting unit III, voltage detecting Device TV3, voltage detection unit III, comparing unit, voltage regulator and PWM generator II,Voltage detector TV3 primary side is connected to separate excitation power supply SES DC side, voltage detector TV3 secondary side access In voltage detection unit III；Voltage detection unit III output and comparing unit input connect；Comparing unit Another input is given direct voltage reference value；Comparing unit accesses voltage regulator, the output end of voltage regulator Access a PWM generator II input；Current detector TA3 primary side is serially connected with separate excitation power supply SES AC, current detector TA3 secondary side access In current detecting unit III；Current detecting unit III access PWM generators II another input, PWM generator II's Output end is directly connected with the IGBT device in separate excitation power supply SES；Current detector TA1 primary side is connected with filter reactor L outer ends, current detector TA1 secondary side access electric current In detection unit I；Current detector TA2 primary side is series in active filter APF output loop, current detector In TA2 secondary side access current detecting unit II；Voltage detector TV1 primary side is connected to passive filter PPF filtering Capacitor C both ends, voltage detector TV2 primary side are connected to passive filter PPF filter reactor L both ends, voltage detecting In device TV1 secondary side access voltage detection unit II, in voltage detector TV2 secondary side access voltage detection unit I；Voltage detection unit I and voltage detection unit II output end are all connected to off resonance degree detection unit；Current detecting unit I Output end access Harmonic currents detection unit in, the output end of Harmonic currents detection unit accordingly accesses weighting filter In；Current detecting unit I output end and the output end of off resonance degree detection unit while the input pair with multiple-harmonic adjuster It should connect, the output end of multiple-harmonic adjuster is accordingly connected with the input of weighting filter；The output end of weighting filter Access a PWM generator I input；Current detecting unit II accesses PWM generator I another input, PWM generator I output end directly with active filter IGBT device in ripple device APF is connected.
- 5. one kind according to claim 4 is transformer coupled and the active tuning type compound filter of separated exciting, its feature exist In：Current detector TA1, current detector TA2 and current detector TA3 are current transformer.
- 6. one kind according to claim 4 is transformer coupled and the active tuning type compound filter of separated exciting, its feature exist In：Voltage detector TV1 and voltage detector TV2 is voltage transformer, and voltage detector TV3 is DC voltage hall sensing Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721053756.8U CN207117182U (en) | 2017-08-22 | 2017-08-22 | A kind of active tuning type compound filter of transformer coupled and separated exciting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721053756.8U CN207117182U (en) | 2017-08-22 | 2017-08-22 | A kind of active tuning type compound filter of transformer coupled and separated exciting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207117182U true CN207117182U (en) | 2018-03-16 |
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ID=61570450
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721053756.8U Expired - Fee Related CN207117182U (en) | 2017-08-22 | 2017-08-22 | A kind of active tuning type compound filter of transformer coupled and separated exciting |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394783A (en) * | 2017-08-22 | 2017-11-24 | 国家电网公司 | The active tuning type compound filter of transformer coupled and separated exciting and control method |
| CN114400642A (en) * | 2022-01-25 | 2022-04-26 | 帝森克罗德集团有限公司 | Harmonic extraction and current limiting method of active power filter |
-
2017
- 2017-08-22 CN CN201721053756.8U patent/CN207117182U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394783A (en) * | 2017-08-22 | 2017-11-24 | 国家电网公司 | The active tuning type compound filter of transformer coupled and separated exciting and control method |
| CN114400642A (en) * | 2022-01-25 | 2022-04-26 | 帝森克罗德集团有限公司 | Harmonic extraction and current limiting method of active power filter |
| CN114400642B (en) * | 2022-01-25 | 2023-11-10 | 帝森克罗德集团有限公司 | Harmonic extraction and current limiting method of active power filter |
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