CN106026098B - A kind of mixed active filtering compensation device and its control method for three phase network - Google Patents
A kind of mixed active filtering compensation device and its control method for three phase network Download PDFInfo
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- CN106026098B CN106026098B CN201610528938.XA CN201610528938A CN106026098B CN 106026098 B CN106026098 B CN 106026098B CN 201610528938 A CN201610528938 A CN 201610528938A CN 106026098 B CN106026098 B CN 106026098B
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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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- 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
A kind of mixed active filtering compensation device for three phase network is combined using the mode of APF and passive filtering and is inhibited to the harmonic wave of three phase network, and is carried out harmonic prediction using three phase network harmonic wave historical data and pre-processed to particular point.
Description
Technical field
The present invention relates to the distribution engineering technical fields in electric system, more particularly, to a kind of for the mixed of three phase network
Mould assembly active power filter compensating device and its control method.
Background technique
With the development of power industry, many users are on the one hand made to propose more and more requirements to power quality, separately
On the one hand, influenced in power distribution network power quality load is more and more thus power quality problem becomes increasingly conspicuous.Such as power electronics
The fast development of technology, electronic power conversion device of electric arc furnaces, electric locomotive, rolling mill, large capacity in power grid etc. are non-thread
Property load, out-of-balance load, impact load are continuously increased, and the harmonic wave, negative-sequence current in power grid steeply rise.Some novel electricity
Power electronic equipment, such as Switching Power Supply, accurate panel welding machine, itself are exactly a harmonic source, while power grid also being required to provide reason
The three-phase symmetric voltage thought, otherwise cisco unity malfunction.Meanwhile harmonic pollution caused by power electronic equipment also affects it
The normal operation of his load.Meanwhile along with the construction of smart grid, the application of advanced power electronics nonlinear load constantly increases
Add, brings the characteristic of serious non-linear, impact and uneven electricity consumption to electric system, also made to the power supply of electric power networks
At serious harmonic pollution, a large amount of harmonic wave and reactive power are injected to electric power networks.Therefore, for the harmonic wave in electric system
Compensation problem has become a current research hotspot.Deviate itself tuning point, resonator system ginseng since passive filter exists
The disadvantage of number, breakdown limited capacity and real-time tracking difficulty, novel filter --- active filter（Active Power
Filter, abbreviation APF）, as the development of power electronics and computer technology is come into being.Harmonic wave is carried out using active filter
The technology of improvement can be found everywhere, such as so-called Active Power Filter-APF, refer to using modern power electronics technology and based on high-speed dsp
Novel electric power harmonic wave control special equipment made of the Digital Signal Processing of device.APF has parallel connection type and two kinds of tandem type,
Parallel connection type APF mainly administers current harmonics, and tandem type APF mainly administers the problem of voltage harmonic etc. causes.The same nothing of APF
Source filter compares, and has many advantages, such as greenization, miniaturization, modularization.For guarantee APF can be used to the harmonic wave in power grid into
Mobile state compensation, method for inhibiting harmonic current mainly has based on the methods of adaptive at present, such as grey Prediction Control method.This
A little methods have in common that degree of intelligence is higher, but it is simultaneously and be not necessarily an advantage, because finding in practical applications
The excessively high algorithm of degree of intelligence is often higher to the hardware requirement of calculating, and the mistake of hardware or failure often lead to harmonic wave and control
The failure of reason causes immeasurable loss to power grid.Therefore the application is dedicated to finding a kind of simple possible, and can be dependent on
The lower but reliable for operation some calculating modes of degree of intelligence and the hardware facility of application.
Based on this, this application provides a kind of mixed active filtering compensation device being easily achieved and its control methods.
Summary of the invention
For the limitation of aforementioned existing harmonic wave control mode, the present invention provides a kind of mixed types for three phase network
Active power filter compensating device can rationally share the harmonic wave control task in three phase network, using with passive filter spy
The low order harmonics of the lower order resonance circuit abatement high-amplitude of point, using the high-order harmonic wave of active filter compensation ultra-wideband, thus
Completely the various harmonic waves in three phase network can be administered, make the actual waveform symmetrical sine in each electric phase branch,
Ensure power quality.Simultaneously as consumption of the lower order resonance circuit to low order harmonics, can be greatly reduced active power filtering
The capacity requirement of device, reduce the mixed active filtering compensation system builds cost.Meanwhile it also offers mixed types
The characteristics of control method of active power filter compensating device, this method is with conspicuous characteristics, and power grid is utilized, for the harmonic wave recurred
Temporal characteristics, targetedly carry out prediction improvement.
One aspect of the present invention provides a kind of mixed active filtering compensation device for three phase network, including A phase is passive
Compensation circuit, the Passively compensated circuit of B phase, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；A phase nothing
The A phase branch of first end connection three phase network of source compensation circuit, the first end of the Passively compensated circuit of B phase connect three-phase electricity
The B phase branch of net is connected to the C phase branch of three phase network, the lower order resonance with the first end of the Passively compensated circuit of C phase
Circuit includes three-phase branch, the A phase branch of the second end connection lower order resonance circuit of the Passively compensated circuit of A phase, the B phase
The B phase branch of the second end connection lower order resonance circuit of Passively compensated circuit connects with the second end of the Passively compensated circuit of C phase
Connect the C phase branch of lower order resonance circuit；
The A phase branch of the A phase output terminal connection three phase network of the three-phase transformer (T1), B phase output terminal connect three-phase
The B phase branch of power grid, C phase output terminal connect the C phase branch of three phase network, A phase input terminal, the B of the three-phase transformer (T1)
The phase input terminal end that is connected end, B that is connected with the A that C phase input terminal is separately connected the active filter is connected end with C.
Further, the Passively compensated circuit of A phase includes switching group and dull tunable filter circuit group, the B phase
Passively compensated circuit includes switching group and dull tunable filter circuit group, and the Passively compensated circuit of C phase includes switching group and list
Adjust tunable filter circuit group.
Further, the switching group includes multiple switch.
Further, the switch is reverse-blocking tetrode thyristor.
Further, the dull tunable filter circuit group is composed in series by inductance and capacitor.
Further, the dull tunable filter circuit group includes at least 5 dull harmonic filter circuits and 7 dullnesses
Harmonic filter circuit, and the dull harmonic filter circuit of every kind of homogeneous is multiple.
Further, the active filter is silent oscillation synchronous compensator plant.
Further, the no-load voltage ratio of the three-phase transformer is adjustable.
It further, further include control device.
Further, the control device is also connected with collector, and the collector is used to acquire the three-phase voltage of power grid
And the real-time harmonic wave of the power grid is calculated according to the three-phase voltage and amperometry that collect in electric current, the control device
Data, the control device are also equipped with database, store to the harmonic data；
The control device further includes active filter controller and switch group controller and transformer voltage ratio controller,
The active filter controller couples the active filter, and the switch group controller couples the switching group, institute
It states transformer voltage ratio controller and couples the transformer.
Further, the control terminal of the switch group controller connection reverse-blocking tetrode thyristor.
Further, the no-load voltage ratio of the transformer has manually and automatically two kinds of regulative modes.
On the other hand, the present invention also provides a kind of power grid harmonic suppression methods, can be applied to dress provided by the present invention
It sets, includes the following steps：
The harmonic data for obtaining the power grid is mended by active filter controller and switch group controller real-time perfoming
Electric current output is repaid, and harmonic data is stored in the database of the control device to establish harmonic data historical data；And
And
The historical data average value at corresponding each moment is obtained according to the harmonic data historical data at first N days each moment；
Harmonic data predicted value is generated according to the historical data average value, the harmonic data predicted value passes through history number
It is obtained according to average value multiplied by preset weight；
Compare the size relation of the harmonic data predicted value and preset harmonic data thresholds；
According to the size relation, the daily early warning moment is generated；
T moment before the daily early warning moment reaches, is controlled the reverse-blocking tetrode thyristor and is connected at least with preparatory connection
The one dull harmonic filter circuit and gear of no-load voltage ratio for reducing the three-phase transformer improves the electric current of transformer output.
Further, when generating the daily early warning when the harmonic data predicted value is greater than preset harmonic data thresholds
It carves.
Further, the N is 7.
Further, the N is 15.
Further, the t is 15 seconds.
Further, the t is 30 seconds.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is mixed active filtering compensation device schematic diagram of the invention.
Fig. 2 is APF structural schematic diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
A kind of mixed active filtering compensation device for three phase network, including the Passively compensated circuit of A phase, B phase are passive
Compensation circuit, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；The first of the Passively compensated circuit of A phase
The A phase branch of end connection three phase network, the B phase branch of the first end connection three phase network of the Passively compensated circuit of B phase and institute
The first end for stating the Passively compensated circuit of C phase is connected to the C phase branch of three phase network, and the lower order resonance circuit includes three-phase branch
Road, the second end connection A phase branch of lower order resonance circuit of the Passively compensated circuit of A phase, the Passively compensated circuit of B phase
The B phase branch of second end connection lower order resonance circuit connects lower order resonance circuit with the second end of the Passively compensated circuit of C phase
C phase branch；The other end of the three-phase branch of lower order resonance circuit links together and is grounded.Lower order resonance circuit is used for low
Order harmonics electric current carries out abatement compensation.
The A phase branch of the A phase output terminal connection three phase network of the three-phase transformer (T1), B phase output terminal connect three-phase
The B phase branch of power grid, C phase output terminal connect the C phase branch of three phase network, A phase input terminal, the B of the three-phase transformer (T1)
The phase input terminal end that is connected end, B that is connected with the A that C phase input terminal is separately connected the active filter is connected end with C.
Further, the Passively compensated circuit of A phase includes switching group and dull tunable filter circuit group, the B phase
Passively compensated circuit includes switching group and dull tunable filter circuit group, and the Passively compensated circuit of C phase includes switching group and list
Adjust tunable filter circuit group.
Further, the switching group includes multiple switch, can by the different states of the multiple switch of switching group
To switch the quantity for the dull tunable filter circuit for being connected to power grid, to obtain the compensation electric current of different subharmonic.
Further, the switch is reverse-blocking tetrode thyristor, and reverse-blocking tetrode thyristor is easy to operate, and can bear biggish load
Electric current.
Further, the dull tunable filter circuit group is composed in series by inductance and capacitor.
Further, the dull tunable filter circuit group may include 5 dull harmonic filter circuits and 7 dullnesses
Harmonic filter circuit, and may include more dull harmonic filter circuit to cope with more complicated grid condition, such as electricity
The harmonic wave of net mainly concentrates situation to be modified setting, and the dull harmonic filter circuit of every kind of homogeneous is multiple, in this way, leading to
The movement for crossing switch, can cut the dull harmonic filter circuit of one or more homogeneous, to change input power grid simultaneously
Certain first harmonic compensation electric current size.
Further, the active filter is silent oscillation synchronous compensator plant, silent oscillation synchronous compensator plant category
Common device in this field.
Further, the no-load voltage ratio of the three-phase transformer is adjustable, is adjusted by the no-load voltage ratio of three-phase transformer, so as to
Amplify the output of active filter.
It further, further include control device.
Further, the control device is also connected with collector, and the collector is used to acquire the three-phase voltage of power grid
And the real-time harmonic wave of the power grid is calculated according to the three-phase voltage and amperometry that collect in electric current, the control device
Data, the control device are also equipped with database, store to the harmonic data；
The control device further includes active filter controller and switch group controller and transformer voltage ratio controller,
The active filter controller couples the active filter, and the switch group controller couples the switching group, institute
It states transformer voltage ratio controller and couples the transformer.
Further, the control terminal of the switch group controller connection reverse-blocking tetrode thyristor.
Further, the no-load voltage ratio of the transformer has manually and automatically two kinds of regulative modes.
On the other hand, the present invention also provides a kind of power grid harmonic suppression methods, can be applied to dress provided by the present invention
It sets, includes the following steps：
The harmonic data of the power grid is obtained, the harmonic data of acquisition includes harmonic current value, passes through sampling power grid
Then voltage and current value analyzes acquisition, the method for obtaining harmonic current value and compensation inhibition harmonic wave has been knowing substantially for this field
One of know, it just repeats no more in this application.Pass through active filter controller and switch group controller real-time perfoming compensation
Electric current output, and harmonic data is stored in the database of the control device to establish harmonic data historical data；And
The historical data average value at corresponding each moment is obtained according to the harmonic data historical data at preceding 7 days each moment,
The harmonic current value of a sampling time point in one week is summed and then is averaged, certainly it will be clear that sampling
Has certain sampling period, the period of sampling is 5 minutes primary or 15 minutes primary or longer periods, excessively frequently
Sampling be that can not receive for system, this point those skilled in the art should define；
Harmonic data predicted value is generated according to the historical data average value, the harmonic data predicted value passes through history number
It is obtained according to average value multiplied by preset weight, the weight used in the present embodiment is 0.5；
Compare the size relation of the harmonic data predicted value and preset harmonic data thresholds, the preset harmonic data thresholds according to
The operating experience of power grid is arranged, such as power grid often occurs some failures then harmonic data thresholds are arranged in a certain harmonic current value
Some a certain range of current value below the harmonic current value；
According to the size relation, the daily early warning moment is generated；
The 15s before the daily early warning moment reaches, controls the reverse-blocking tetrode thyristor with preparatory connection and at least one is connected
Dull harmonic filter circuit and reduce the three-phase transformer no-load voltage ratio gear.That is, occurring in power grid " habituation "
The time inertia that the value of raising compensation in advance before harmonic wave biggish time point, in this way setting are in fact derived from harmonic wave generation is special
Point, inhibit to find significant effect in practical applications to the improvement of harmonic wave so in advance.
Embodiment two
A kind of mixed active filtering compensation device for three phase network, including the Passively compensated circuit of A phase, B phase are passive
Compensation circuit, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；The first of the Passively compensated circuit of A phase
The A phase branch of end connection three phase network, the B phase branch of the first end connection three phase network of the Passively compensated circuit of B phase and institute
The first end for stating the Passively compensated circuit of C phase is connected to the C phase branch of three phase network, and the lower order resonance circuit includes three-phase branch
Road, the second end connection A phase branch of lower order resonance circuit of the Passively compensated circuit of A phase, the Passively compensated circuit of B phase
The B phase branch of second end connection lower order resonance circuit connects lower order resonance circuit with the second end of the Passively compensated circuit of C phase
C phase branch；The other end of the three-phase branch of lower order resonance circuit links together and is grounded.Lower order resonance circuit is used for low
Order harmonics electric current carries out abatement compensation.
The A phase branch of the A phase output terminal connection three phase network of the three-phase transformer (T1), B phase output terminal connect three-phase
The B phase branch of power grid, C phase output terminal connect the C phase branch of three phase network, A phase input terminal, the B of the three-phase transformer (T1)
The phase input terminal end that is connected end, B that is connected with the A that C phase input terminal is separately connected the active filter is connected end with C.
Further, the Passively compensated circuit of A phase includes switching group and dull tunable filter circuit group, the B phase
Passively compensated circuit includes switching group and dull tunable filter circuit group, and the Passively compensated circuit of C phase includes switching group and list
Adjust tunable filter circuit group.
Further, the switching group includes multiple switch, can by the different states of the multiple switch of switching group
To switch the quantity for the dull tunable filter circuit for being connected to power grid, to obtain the compensation electric current of different subharmonic.
Further, the switch is reverse-blocking tetrode thyristor, and reverse-blocking tetrode thyristor is easy to operate, and can bear biggish load
Electric current.
Further, the dull tunable filter circuit group is composed in series by inductance and capacitor.
Further, the dull tunable filter circuit group may include 5 dull harmonic filter circuits and 7 dullnesses
Harmonic filter circuit and 11 dull harmonic filter circuits, and the dull harmonic filter circuit of every kind of homogeneous is 3, in this way,
By the movement of switch, the dull harmonic filter circuit of one or more homogeneous can be cut simultaneously, to change input electricity
The size of certain first harmonic compensation electric current of net.
Further, the active filter is silent oscillation synchronous compensator plant, silent oscillation synchronous compensator plant category
Common device in this field.
Further, the no-load voltage ratio of the three-phase transformer is adjustable, is adjusted by the no-load voltage ratio of three-phase transformer, so as to
Amplify the output of active filter.
It further, further include control device.
Further, the control device is also connected with collector, and the collector is used to acquire the three-phase voltage of power grid
And the real-time harmonic wave of the power grid is calculated according to the three-phase voltage and amperometry that collect in electric current, the control device
Data, the control device are also equipped with database, store to the harmonic data；
The control device further includes active filter controller and switch group controller and transformer voltage ratio controller,
The active filter controller couples the active filter, and the switch group controller couples the switching group, institute
It states transformer voltage ratio controller and couples the transformer.
Further, the control terminal of the switch group controller connection reverse-blocking tetrode thyristor.
The no-load voltage ratio of transformer is adjusted by controller.
On the other hand, the present invention also provides a kind of power grid harmonic suppression methods, can be applied to dress provided by the present invention
It sets, includes the following steps：
The harmonic data for obtaining the power grid is mended by active filter controller and switch group controller real-time perfoming
Electric current output is repaid, and harmonic data is stored in the database of the control device to establish harmonic data historical data；And
And
The historical data average value at corresponding each moment is obtained according to the harmonic data historical data at preceding 15 days each moment；
Harmonic data predicted value is generated according to the historical data average value, the harmonic data predicted value passes through history number
It is obtained according to average value multiplied by preset weight；
Compare the size relation of the harmonic data predicted value and preset harmonic data thresholds；
According to the size relation, the daily early warning moment is generated；
30s before the daily early warning moment reaches controls the reverse-blocking tetrode thyristor with preparatory connection conducting at least one
The gear of a dullness harmonic filter circuit and the no-load voltage ratio for reducing the three-phase transformer.
Further, when generating the daily early warning when the harmonic data predicted value is greater than preset harmonic data thresholds
It carves.
To sum up, using a kind of mixed active filtering compensation system for three phase network provided by the present invention, have
Following beneficial effect：(1) the harmonic wave control task in three phase network can rationally be shared；(2) the supper-fast suppression of harmonic wave can be achieved
System.
As described above, the present invention can be realized preferably.For a person skilled in the art, religion according to the present invention
It leads, designs various forms of mixed active filtering compensation systems for three phase network and do not need creative labor.
These embodiments are changed without departing from the principles and spirit of the present invention, are modified, are replaced, are integrated and modification still
It falls within the scope of protection of the present invention.
Claims (8)
1. a kind of mixed active filtering compensation device for three phase network, which is characterized in that including the Passively compensated electricity of A phase
Road, the Passively compensated circuit of B phase, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter, further include that low order is humorous
Shake circuit and control device；
The of the first end connection A phase branch of three phase network of the Passively compensated circuit of A phase, the Passively compensated circuit of B phase
The B phase branch of one end connection three phase network is connected to the C phase branch of three phase network with the first end of the Passively compensated circuit of C phase
Road, the lower order resonance circuit include three-phase branch, the second end connection lower order resonance circuit of the Passively compensated circuit of A phase
A phase branch, the Passively compensated circuit of B phase second end connection lower order resonance circuit B phase branch and the C phase it is Passively compensated
The C phase branch of the second end connection lower order resonance circuit of circuit；
The A phase branch of the A phase output terminal connection three phase network of the three-phase transformer (T1), B phase output terminal connect three phase network
B phase branch, C phase output terminal connect three phase network C phase branch, the A phase input terminal of the three-phase transformer (T1), B phase are defeated
Enter end and be connected with the A that C phase input terminal is separately connected the active filter end, the end that is connected B is connected end with C；
The control device is also connected with collector, and the collector is used to acquire the three-phase voltage and electric current of power grid, the control
The real-time harmonic data of the power grid, the control dress is calculated according to the three-phase voltage and amperometry that collect in device
It sets and is also equipped with database, the harmonic data is stored；
The control device further includes active filter controller and switchs group controller and transformer voltage ratio controller, described
Active filter controller couples the active filter, and the switch group controller couples the switching group, the change
Transformer voltage ratio controller couples the transformer；
The active power filter compensating device can obtain the harmonic data of the power grid, by active filter controller and open
The compensation electric current output of group controller real-time perfoming is closed, and harmonic data is stored in the database of the control device to establish
Harmonic data historical data；And
The historical data average value at corresponding each moment is obtained according to the harmonic data historical data at first N days each moment；
Harmonic data predicted value is generated according to the historical data average value, the harmonic data predicted value is flat by historical data
Mean value is obtained multiplied by preset weight；
Compare the size relation of the harmonic data predicted value and preset harmonic data thresholds；
According to the size relation, the daily early warning moment is generated；
T moment before the daily early warning moment reaches, controlling reverse-blocking tetrode thyristor, at least one is dull with preparatory connection conducting
Harmonic filter circuit and reduce the three-phase transformer no-load voltage ratio gear.
2. mixed active filtering compensation device as described in claim 1, which is characterized in that the Passively compensated circuit of A phase
Including switching group and dull tunable filter circuit group, the Passively compensated circuit of B phase includes switching group and dull tuning filtering electricity
Road group, the Passively compensated circuit of C phase include switching group and dull tunable filter circuit group.
3. a kind of power grid harmonic suppression method is used for mixed active filtering compensation device as described in claim 1, feature
It is, includes the following steps：
The harmonic data for obtaining the power grid passes through active filter controller and switch group controller real-time perfoming compensation electricity
Stream output, and harmonic data is stored in the database of the control device to establish harmonic data historical data；And
The historical data average value at corresponding each moment is obtained according to the harmonic data historical data at first N days each moment；
Harmonic data predicted value is generated according to the historical data average value, the harmonic data predicted value is flat by historical data
Mean value is obtained multiplied by preset weight；
Compare the size relation of the harmonic data predicted value and preset harmonic data thresholds；
According to the size relation, the daily early warning moment is generated；
T moment before the daily early warning moment reaches, controls the reverse-blocking tetrode thyristor with preparatory connection and at least one is connected
Dull harmonic filter circuit and reduce the three-phase transformer no-load voltage ratio gear.
4. power grid harmonic suppression method as claimed in claim 3, which is characterized in that when the harmonic data predicted value is greater than in advance
If harmonic data thresholds when generate the daily early warning moment.
5. power grid harmonic suppression method as claimed in claim 3, which is characterized in that the N is 7.
6. power grid harmonic suppression method as claimed in claim 3, which is characterized in that the N is 15.
7. power grid harmonic suppression method as claimed in claim 3, which is characterized in that the t is 15 seconds.
8. power grid harmonic suppression method as claimed in claim 3, which is characterized in that the t is 30 seconds.
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| CN201985526U (en) * | 2011-01-19 | 2011-09-21 | 上海追日电气有限公司 | Parallel hybrid filtering compensation device |
| CN105098781A (en) * | 2015-09-30 | 2015-11-25 | 成都星宇节能技术股份有限公司 | Hybrid type active power filter compensation system used for three-phase network |
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| CN201985526U (en) * | 2011-01-19 | 2011-09-21 | 上海追日电气有限公司 | Parallel hybrid filtering compensation device |
| CN105098781A (en) * | 2015-09-30 | 2015-11-25 | 成都星宇节能技术股份有限公司 | Hybrid type active power filter compensation system used for three-phase network |
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