CN106026098A - Hybrid active filtering compensation apparatus for three-phase power grid, and control method thereof - Google Patents
Hybrid active filtering compensation apparatus for three-phase power grid, and control method thereof Download PDFInfo
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- CN106026098A CN106026098A CN201610528938.XA CN201610528938A CN106026098A CN 106026098 A CN106026098 A CN 106026098A CN 201610528938 A CN201610528938 A CN 201610528938A CN 106026098 A CN106026098 A CN 106026098A
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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]
Abstract
The invention discloses a hybrid active filtering compensation apparatus for a three-phase power grid. Harmonic waves of the three-phase power grid are inhibited through combination of an APF and a passive filtering mode, and by use of harmonic historical data of the three-phase power grid, harmonic predication is carried out and special points are preprocessed.
Description
Technical field
The present invention relates to the distribution engineering technical field in power system, especially relate to a kind of mixed active filtering compensation device for three phase network and control method thereof.
Background technology
Along with the development of power industry, on the one hand make many users that the quality of power supply proposes increasing requirement, on the other hand, the load affecting the quality of power supply in power distribution network is more and more thus power quality problem becomes increasingly conspicuous.Such as the fast development of Power Electronic Technique, nonlinear-load, out-of-balance load, the impact load such as electric arc furnace in electrical network, electric locomotive, rolling mill, jumbo electronic power conversion device are continuously increased, and harmonic wave, negative-sequence current in electrical network steeply rise.Some novel power electronic equipments, such as Switching Power Supply, accurate panel welding machine etc., self are exactly a harmonic source, the most also require that electrical network provides preferable three-phase symmetric voltage, otherwise cisco unity malfunction.Meanwhile, harmonic pollution produced by power electronic equipment also affects the properly functioning of other loads.Simultaneously, construction along with intelligent grid, the application of advanced power electronics nonlinear load is continuously increased, serious non-linear, impact and the characteristic of uneven electricity consumption is brought to power system, cause serious harmonic pollution also to the power supply of electric power networks, electric power networks is injected substantial amounts of harmonic wave and reactive power.Therefore, a current study hotspot has been become for the harmonic compensation problem in power system.Deviate self tuning point, resonator system parameter owing to passive filter exists, puncture limited capacity and the shortcoming of real-time tracking difficulty, novel filter active filter (Active Power Filter, it is called for short APF), along with the development of power electronics and computer technology is arisen at the historic moment.Application active filter carries out the technology of harmonic wave control and can be found everywhere, and such as so-called Active Power Filter-APF, refers to the novel electric power harmonic wave control special equipment using modern power electronics technology and Digital Signal Processing based on high-speed dsp device to make.APF has parallel connection type and tandem type two kinds, and parallel connection type APF mainly administers current harmonics, and tandem type APF mainly administers the problem that voltage harmonic etc. causes.APF compares with passive filter, has the advantages such as greenization, miniaturization, modularity.Carrying out dynamic compensation for ensureing APF to can be used to the harmonic wave in electrical network, current method for inhibiting harmonic current mainly has based on methods such as self adaptations, such as grey Prediction Control method etc..These methods have in common that degree of intelligence is higher, but it simultaneously and may not be certain to be an advantage, because the algorithm that discovery degree of intelligence is too high in actual applications is often higher to the hardware requirement calculated, and the mistake of hardware or fault often lead to the failure of harmonic wave control, electrical network is caused immeasurable loss.Therefore the application is devoted to find a kind of simple possible, and can be dependent on some relatively low but reliable computation schemas 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 control method thereof.
Summary of the invention
Limitation for aforementioned existing harmonic wave control mode, the invention provides a kind of mixed active filtering compensation device for three phase network, can rationally share the harmonic wave control task in three phase network, it utilizes the low order harmonics of the lower order resonance circuit abatement high-amplitude with passive filter feature, active filter is utilized to compensate the high-order harmonic wave of ultra-wideband, thus can be complete the various harmonic waves in three phase network are administered, make the actual waveform symmetrical sine in each electricity phase branch road, it is ensured that the quality of power supply.Simultaneously as the consumption that lower order resonance circuit is to low order harmonics, the capacity requirement of active filter can be greatly reduced, reduce described mixed active filtering compensation system builds cost.Meanwhile, it also offers the control method of mixed active filtering compensation device, the method is with conspicuous characteristics, make use of the feature of electrical network, for the temporal characteristics of the harmonic wave recurred, is predicted targetedly administering.
One aspect of the present invention provides a kind of mixed active filtering compensation device for three phase network, including the Passively compensated circuit of A phase, the Passively compensated circuit of B phase, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；The B phase branch road of the first end connection three phase network that the first end of the Passively compensated circuit of A phase connects the A phase branch road of three phase network, the described Passively compensated circuit of B phase is connected to the C phase branch road of three phase network with the first end of the described Passively compensated circuit of C phase, described lower order resonance circuit includes three-phase branch road, and the second end of the second end of the described Passively compensated circuit of A phase connects the A phase branch road of lower order resonance circuit, the second end of the described Passively compensated circuit of B phase connects lower order resonance circuit B phase branch road and the described Passively compensated circuit of C phase connects the C phase branch road of lower order resonance circuit；
The A phase output terminal of described three-phase transformer (T1) connects the A phase branch road of three phase network, B phase output terminal connects the B phase branch road of three phase network, C phase output terminal connects the C phase branch road of three phase network, and the A phase input of described three-phase transformer (T1), B phase input connect be connected end, B of the A of described active filter respectively and be connected and hold the end that is connected with C with C phase input.
Further, the described Passively compensated circuit of A phase includes switches set and dull tunable filter circuit group, the described Passively compensated circuit of B phase includes switches set and dull tunable filter circuit group, and the described Passively compensated circuit of C phase includes switches set and dull tunable filter circuit group.
Further, described switches set includes multiple switch.
Further, described switch is reverse-blocking tetrode thyristor.
Further, described dull tunable filter circuit group is made up of inductance and capacitances in series.
Further, described dull tunable filter circuit group at least includes 5 dull harmonic filter circuits and 7 dull harmonic filter circuits, and the dull harmonic filter circuit of every kind of homogeneous is multiple.
Further, described active filter is silent oscillation synchronous compensator plant.
Further, the no-load voltage ratio of described three-phase transformer is adjustable.
Further, it also includes controlling device.
Further, described control device is also connected with harvester, described harvester is for gathering three-phase voltage and the electric current of electrical network, described control device is calculated, according to the three-phase voltage collected and amperometry, the harmonic data that described electrical network is real-time, described control device is also equipped with data base, stores described harmonic data；
Described control device also includes active filter controller and switches set controller and transformer voltage ratio controller, described active filter controller couples described active filter, described switches set controller couples described switches set, and described transformer voltage ratio controller couples described transformator.
Further, described switches set controller connects the control end of reverse-blocking tetrode thyristor.
Further, the no-load voltage ratio of described transformator possesses manually and automatically two kinds of regulative modes.
On the other hand, the present invention also provides for a kind of power grid harmonic suppression method, and it can be applicable to device provided by the present invention, comprises the following steps:
Obtain the harmonic data of described electrical network, compensate electric current in real time by active filter controller and switches set controller and export, and harmonic data is stored in the data base of described control device to set up harmonic data historical data；And
Harmonic data historical data according to first N days each moment obtains the historical data meansigma methods in corresponding each moment；
Generating harmonic data predictive value according to described historical data meansigma methods, described harmonic data predictive value is multiplied by default weights by historical data meansigma methods and obtains；
Relatively described harmonic data predictive value and the magnitude relationship of default harmonic data thresholds；
According to described magnitude relationship, generate early warning moment every day；
T before described early warning moment every day arrives, controls described reverse-blocking tetrode thyristor to connect at least one dull harmonic filter circuit of conducting in advance and to reduce the gear of no-load voltage ratio of described three-phase transformer to improve the electric current of transformator output.
Further, described early warning moment every day is generated when described harmonic data predictive value is more than the harmonic data thresholds preset.
Further, described N is 7.
Further, described N is 15.
Further, described t is 15 seconds.
Further, described t is 30 seconds.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in describing embodiment below, the required accompanying drawing used is briefly described, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the mixed active filtering compensation device schematic diagram of the present invention.
Fig. 2 is APF structural representation.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
A kind of mixed active filtering compensation device for three phase network, including the Passively compensated circuit of A phase, the Passively compensated circuit of B phase, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；The B phase branch road of the first end connection three phase network that the first end of the Passively compensated circuit of A phase connects the A phase branch road of three phase network, the described Passively compensated circuit of B phase is connected to the C phase branch road of three phase network with the first end of the described Passively compensated circuit of C phase, described lower order resonance circuit includes three-phase branch road, and the second end of the second end of the described Passively compensated circuit of A phase connects the A phase branch road of lower order resonance circuit, the second end of the described Passively compensated circuit of B phase connects lower order resonance circuit B phase branch road and the described Passively compensated circuit of C phase connects the C phase branch road of lower order resonance circuit；The other end of the three-phase branch road of lower order resonance circuit links together and ground connection.Lower order resonance circuit compensates for low order harmonic currents carries out abatement.
The A phase output terminal of described three-phase transformer (T1) connects the A phase branch road of three phase network, B phase output terminal connects the B phase branch road of three phase network, C phase output terminal connects the C phase branch road of three phase network, and the A phase input of described three-phase transformer (T1), B phase input connect be connected end, B of the A of described active filter respectively and be connected and hold the end that is connected with C with C phase input.
Further, the described Passively compensated circuit of A phase includes switches set and dull tunable filter circuit group, the described Passively compensated circuit of B phase includes switches set and dull tunable filter circuit group, and the described Passively compensated circuit of C phase includes switches set and dull tunable filter circuit group.
Further, described switches set includes multiple switch, by the different state of multiple switches of switches set, can switch the quantity of the dull tunable filter circuit being connected to electrical network, thus obtain the compensation electric current of different subharmonic..
Further, described switch is reverse-blocking tetrode thyristor, and reverse-blocking tetrode thyristor is easy to operate, and can bear bigger load current.
Further, described dull tunable filter circuit group is made up of inductance and capacitances in series.
Further, described dull tunable filter circuit group can include 5 dull harmonic filter circuits and 7 dull harmonic filter circuits, and can include that more dull harmonic filter circuit is to tackle more complicated grid condition, as the harmonic wave of electrical network mainly concentrates situation to be modified setting, and the dull harmonic filter circuit of every kind of homogeneous is multiple, so, action by switch, the dull harmonic filter circuit of one or more homogeneous can be cut simultaneously, thus certain first harmonic changing input electrical network compensates the size of electric current.
Further, described active filter is silent oscillation synchronous compensator plant, and silent oscillation synchronous compensator plant belongs to the conventional device of this area.
Further, the no-load voltage ratio of described three-phase transformer is adjustable, is regulated by the no-load voltage ratio of three-phase transformer, such that it is able to amplify the output of active filter.
Further, it also includes controlling device.
Further, described control device is also connected with harvester, described harvester is for gathering three-phase voltage and the electric current of electrical network, described control device is calculated, according to the three-phase voltage collected and amperometry, the harmonic data that described electrical network is real-time, described control device is also equipped with data base, stores described harmonic data；
Described control device also includes active filter controller and switches set controller and transformer voltage ratio controller, described active filter controller couples described active filter, described switches set controller couples described switches set, and described transformer voltage ratio controller couples described transformator.
Further, described switches set controller connects the control end of reverse-blocking tetrode thyristor.
Further, the no-load voltage ratio of described transformator possesses manually and automatically two kinds of regulative modes.
On the other hand, the present invention also provides for a kind of power grid harmonic suppression method, and it can be applicable to device provided by the present invention, comprises the following steps:
Obtain the harmonic data of described electrical network, the harmonic data obtained includes harmonic current value, then it analyze acquisition by the voltage x current value of sampling electrical network, and the method for acquisition harmonic current value and compensation suppression harmonic wave has been one of ABC of this area, the most just repeats no more.Compensate electric current in real time by active filter controller and switches set controller to export, and harmonic data is stored in the data base of described control device to set up harmonic data historical data；And
Harmonic data historical data according to first 7 days each moment obtains the historical data meansigma methods in corresponding each moment, then the harmonic current value summation that will put in one week interior sampling time averages, certainly to note here is that, sampling possesses certain sampling period, the cycle of sampling be 5 minutes once or 15 minutes once or longer cycle, crossing that to sample frequently for system be to accept, this point those skilled in the art should be clear and definite；
Generating harmonic data predictive value according to described historical data meansigma methods, described harmonic data predictive value is multiplied by default weights by historical data meansigma methods and obtains, and the weights used in the present embodiment are 0.5；
Relatively described harmonic data predictive value and the magnitude relationship of default harmonic data thresholds, this harmonic data thresholds preset is arranged according to the operating experience of electrical network, and such as when a certain harmonic current value, electrical network often occurs some faults that harmonic data thresholds is then arranged on below this harmonic current value certain current value a range of；
According to described magnitude relationship, generate early warning moment every day；
15s before described early warning moment every day arrives, controls described reverse-blocking tetrode thyristor to connect at least one dullness harmonic filter circuit of conducting in advance and to reduce the gear of no-load voltage ratio of described three-phase transformer.It is to say, improved the value of compensation before electrical network " habitual " occurs the time point that harmonic wave is bigger in advance, such setting is in fact derived from the time inertial characteristics of harmonic wave generation, and effect is notable to suppress the improvement to harmonic wave to find in actual applications the most in advance.
Embodiment two
A kind of mixed active filtering compensation device for three phase network, including the Passively compensated circuit of A phase, the Passively compensated circuit of B phase, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；The B phase branch road of the first end connection three phase network that the first end of the Passively compensated circuit of A phase connects the A phase branch road of three phase network, the described Passively compensated circuit of B phase is connected to the C phase branch road of three phase network with the first end of the described Passively compensated circuit of C phase, described lower order resonance circuit includes three-phase branch road, and the second end of the second end of the described Passively compensated circuit of A phase connects the A phase branch road of lower order resonance circuit, the second end of the described Passively compensated circuit of B phase connects lower order resonance circuit B phase branch road and the described Passively compensated circuit of C phase connects the C phase branch road of lower order resonance circuit；The other end of the three-phase branch road of lower order resonance circuit links together and ground connection.Lower order resonance circuit compensates for low order harmonic currents carries out abatement.
The A phase output terminal of described three-phase transformer (T1) connects the A phase branch road of three phase network, B phase output terminal connects the B phase branch road of three phase network, C phase output terminal connects the C phase branch road of three phase network, and the A phase input of described three-phase transformer (T1), B phase input connect be connected end, B of the A of described active filter respectively and be connected and hold the end that is connected with C with C phase input.
Further, the described Passively compensated circuit of A phase includes switches set and dull tunable filter circuit group, the described Passively compensated circuit of B phase includes switches set and dull tunable filter circuit group, and the described Passively compensated circuit of C phase includes switches set and dull tunable filter circuit group.
Further, described switches set includes multiple switch, by the different state of multiple switches of switches set, can switch the quantity of the dull tunable filter circuit being connected to electrical network, thus obtain the compensation electric current of different subharmonic..
Further, described switch is reverse-blocking tetrode thyristor, and reverse-blocking tetrode thyristor is easy to operate, and can bear bigger load current.
Further, described dull tunable filter circuit group is made up of inductance and capacitances in series.
Further, described dull tunable filter circuit group can include 5 dull harmonic filter circuits and 7 dull harmonic filter circuits and 11 dull harmonic filter circuits, and the dull harmonic filter circuit of every kind of homogeneous is 3, so, action by switch, the dull harmonic filter circuit of one or more homogeneous can be cut simultaneously, thus certain first harmonic changing input electrical network compensates the size of electric current.
Further, described active filter is silent oscillation synchronous compensator plant, and silent oscillation synchronous compensator plant belongs to the conventional device of this area.
Further, the no-load voltage ratio of described three-phase transformer is adjustable, is regulated by the no-load voltage ratio of three-phase transformer, such that it is able to amplify the output of active filter.
Further, it also includes controlling device.
Further, described control device is also connected with harvester, described harvester is for gathering three-phase voltage and the electric current of electrical network, described control device is calculated, according to the three-phase voltage collected and amperometry, the harmonic data that described electrical network is real-time, described control device is also equipped with data base, stores described harmonic data；
Described control device also includes active filter controller and switches set controller and transformer voltage ratio controller, described active filter controller couples described active filter, described switches set controller couples described switches set, and described transformer voltage ratio controller couples described transformator.
Further, described switches set controller connects the control end of reverse-blocking tetrode thyristor.
The no-load voltage ratio of transformator is regulated by controller.
On the other hand, the present invention also provides for a kind of power grid harmonic suppression method, and it can be applicable to device provided by the present invention, comprises the following steps:
Obtain the harmonic data of described electrical network, compensate electric current in real time by active filter controller and switches set controller and export, and harmonic data is stored in the data base of described control device to set up harmonic data historical data；And
Harmonic data historical data according to first 15 days each moment obtains the historical data meansigma methods in corresponding each moment；
Generating harmonic data predictive value according to described historical data meansigma methods, described harmonic data predictive value is multiplied by default weights by historical data meansigma methods and obtains；
Relatively described harmonic data predictive value and the magnitude relationship of default harmonic data thresholds；
According to described magnitude relationship, generate early warning moment every day；
30s before described early warning moment every day arrives, controls described reverse-blocking tetrode thyristor to connect at least one dull harmonic filter circuit of conducting in advance and to reduce the gear of no-load voltage ratio of described three-phase transformer.
Further, described early warning moment every day is generated when described harmonic data predictive value is more than the harmonic data thresholds preset.
To sum up, use a kind of mixed active filtering compensation system for three phase network provided by the present invention, have the advantages that (1) can rationally share the harmonic wave control task in three phase network；(2) the supper-fast suppression of harmonic wave can be realized.
As it has been described above, the present invention can preferably be realized.For a person skilled in the art, according to the teachings of the present invention, the mixed active filtering compensation system for three phase network designing multi-form is not required to performing creative labour.Without departing from the principles and spirit of the present invention these embodiments are changed, revise, replace, integrate and modification still falls within protection scope of the present invention.
Claims (10)
1. the mixed active filtering compensation device for three phase network, it is characterised in that include the Passively compensated circuit of A phase, the Passively compensated circuit of B phase, the Passively compensated circuit of C phase, three-phase transformer (T1) and active filter；
The B phase branch road of the first end connection three phase network that the first end of the described Passively compensated circuit of A phase connects the A phase branch road of three phase network, the described Passively compensated circuit of B phase is connected to the C phase branch road of three phase network with the first end of the described Passively compensated circuit of C phase, described lower order resonance circuit includes three-phase branch road, and the second end of the second end of the described Passively compensated circuit of A phase connects the A phase branch road of lower order resonance circuit, the second end of the described Passively compensated circuit of B phase connects lower order resonance circuit B phase branch road and the described Passively compensated circuit of C phase connects the C phase branch road of lower order resonance circuit；
The A phase output terminal of described three-phase transformer (T1) connects the A phase branch road of three phase network, B phase output terminal connects the B phase branch road of three phase network, C phase output terminal connects the C phase branch road of three phase network, and the A phase input of described three-phase transformer (T1), B phase input connect be connected end, B of the A of described active filter respectively and be connected and hold the end that is connected with C with C phase input.
2. mixed active filtering compensation device as claimed in claim 1, it is characterized in that, the described Passively compensated circuit of A phase includes switches set and dull tunable filter circuit group, the described Passively compensated circuit of B phase includes switches set and dull tunable filter circuit group, and the described Passively compensated circuit of C phase includes switches set and dull tunable filter circuit group.
3. mixed active filtering compensation device as claimed in claim 1, it is characterised in that it also includes controlling device.
4. mixed active filtering compensation device as claimed in claim 3, it is characterized in that, described control device is also connected with harvester, described harvester is for gathering three-phase voltage and the electric current of electrical network, described control device is calculated, according to the three-phase voltage collected and amperometry, the harmonic data that described electrical network is real-time, described control device is also equipped with data base, stores described harmonic data；
Described control device also includes active filter controller and switches set controller and transformer voltage ratio controller, described active filter controller couples described active filter, described switches set controller couples described switches set, and described transformer voltage ratio controller couples described transformator.
5. a power grid harmonic suppression method, it is used for mixed active filtering compensation device as claimed in claim 1, it is characterised in that comprise the following steps:
Obtain the harmonic data of described electrical network, compensate electric current in real time by active filter controller and switches set controller and export, and harmonic data is stored in the data base of described control device to set up harmonic data historical data；And
Harmonic data historical data according to first N days each moment obtains the historical data meansigma methods in corresponding each moment；
Generating harmonic data predictive value according to described historical data meansigma methods, described harmonic data predictive value is multiplied by default weights by historical data meansigma methods and obtains；
Relatively described harmonic data predictive value and the magnitude relationship of default harmonic data thresholds；
According to described magnitude relationship, generate early warning moment every day；
T before described early warning moment every day arrives, controls described reverse-blocking tetrode thyristor to connect at least one dull harmonic filter circuit of conducting in advance and to reduce the gear of no-load voltage ratio of described three-phase transformer.
6. power grid harmonic suppression method as claimed in claim 5, generates described early warning moment every day when described harmonic data predictive value is more than the harmonic data thresholds preset.
7. power grid harmonic suppression method as claimed in claim 5, described N is 7.
8. power grid harmonic suppression method as claimed in claim 5, described N is 15.
9. power grid harmonic suppression method as claimed in claim 5, described t is 15 seconds.
10. power grid harmonic suppression method as claimed in claim 5, described t is 30 seconds.
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| CN106655184A (en) * | 2016-12-06 | 2017-05-10 | 广州市科恩电脑有限公司 | Power distribution system capable of intelligent filtering compensation |
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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 |
| US20140375334A1 (en) * | 2013-06-21 | 2014-12-25 | Hamilton Sundstrand Corporation | Systems and methods for selecting circuit element values for a hybrid active power filter operating over a variable frequency |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| US20140375334A1 (en) * | 2013-06-21 | 2014-12-25 | Hamilton Sundstrand Corporation | Systems and methods for selecting circuit element values for a hybrid active power filter operating over a variable frequency |
| 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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| CN106655184A (en) * | 2016-12-06 | 2017-05-10 | 广州市科恩电脑有限公司 | Power distribution system capable of intelligent filtering compensation |
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