CN108879739A - A kind of three-phase imbalance regulating device - Google Patents
A kind of three-phase imbalance regulating device Download PDFInfo
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- CN108879739A CN108879739A CN201810892008.1A CN201810892008A CN108879739A CN 108879739 A CN108879739 A CN 108879739A CN 201810892008 A CN201810892008 A CN 201810892008A CN 108879739 A CN108879739 A CN 108879739A
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- sequence component
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of three-phase imbalance regulating devices, including：For obtaining the acquisition module of the current signal of power grid, controller, three-level current transformer, drive module, multiple capacitors and marshalling switch；Controller, it is each alternate for being accessed capacitor by marshalling switch, to shift each alternate watt current；It is also used to analyze current signal, obtains positive-sequence component, negative sequence component and the zero-sequence component of out-of-balance current, driving signal is generated according to positive-sequence component, negative sequence component and zero-sequence component；Drive module, for after receiving driving signal, driving three-level current transformer to export the compensation electric current reversed with negative sequence component and zero-sequence component.The present invention first carries out three phase unbalance current Passively compensated, then active compensation is carried out to three phase unbalance current, so that the electric current of grid side is reached three-phase equilibrium state, while eliminating negative sequence component and zero-sequence component, power supply quality can be improved, improve the stability of electric power netting safe running.
Description
Technical field
The present invention relates to field of power distribution, more particularly to a kind of three-phase injustice regulating device.
Background technique
Three-phase imbalance refers to that three-phase current in electric system (or voltage) amplitude is inconsistent, and difference in magnitude is more than regulation model
It encloses.In the rural power grids power supply system of low voltage three-phase four-wire system, most of distribution transformer is all made of three-phase transformer, and transformer goes out
The three-phase load of mouth should theoretically reach symmetrically, but since user is mostly single-phase load, power load distributing is unbalanced, be easy
A large amount of out-of-balance currents are generated, power supply quality is reduced, while low voltage electric network is seriously threatened with electrical equipment safe operation.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art need to solve at present
Problem.
Summary of the invention
The object of the present invention is to provide a kind of three-phase imbalance regulating devices, carry out first to three phase unbalance current passive
Then compensation carries out active compensation to three phase unbalance current, so that the electric current of grid side is reached three-phase equilibrium state, eliminate simultaneously
Fall negative sequence component and zero-sequence component, power supply quality can be improved, improves the stability of electric power netting safe running.
In order to solve the above technical problems, the present invention provides a kind of three-phase imbalance regulating devices, including：
For obtaining the acquisition module of the current signal of power grid, controller, three-level current transformer, drive module, Duo Ge electricity
Container and marshalling switch；
The controller, it is each alternate for being accessed the capacitor by the marshalling switch, to shift each institute
State alternate watt current；It is also used to analyze the current signal, obtains positive-sequence component, the negative sequence component and zero of out-of-balance current
Order components generate driving signal according to the positive-sequence component, the negative sequence component and the zero-sequence component；
The drive module, for after receiving the driving signal, driving the three-level current transformer to export and institute
State negative sequence component and the reversed compensation electric current of the zero-sequence component.
Preferably, the controller is also used to, between the capacitor is accessed each phase zero by the marshalling switch, with
Compensate each alternate reactive power.
Preferably, the analysis current signal, obtains positive-sequence component, negative sequence component and the zero sequence point of out-of-balance current
The process of amount is specially：
Fourier decomposition is carried out to the current signal and obtains positive-sequence component, negative sequence component and the zero sequence point of out-of-balance current
Amount.
Preferably, which further includes：
The filter module being connect with the three-level current transformer, for eliminating the high frequency spurs in the compensation electric current.
Preferably, the filter module includes multiple direct current flat wave capacitors and LCL filter.
Preferably, the controller includes Digital Signal Processing dsp controller.
Preferably, the controller further includes field programmable gate array FPGA.
Preferably, the acquisition module includes：
Sampling unit, for acquiring the analog current signal of power grid；
A/D converting unit, for the analog current signal to be converted to digital current signal；
Then the process of the analysis current signal is specially：
Analyze the digital current signal.
Preferably, the three-phase imbalance regulating device further includes：
Communication interface, for being communicated with host computer.
Preferably, the communication interface is RS485 communication interface.
The present invention provides a kind of three-phase imbalance regulating devices, including：For obtaining the acquisition of the current signal of power grid
Module, controller, three-level current transformer, drive module, multiple capacitors and marshalling switch；Controller, for being opened by marshalling
Pass capacitor is accessed it is each alternate, to shift each alternate watt current；It is also used to analyze current signal, obtains imbalance
Positive-sequence component, negative sequence component and the zero-sequence component of electric current generate driving letter according to positive-sequence component, negative sequence component and zero-sequence component
Number；Drive module, for after receiving driving signal, driving three-level current transformer output to be anti-with negative sequence component and zero-sequence component
To compensation electric current.
As it can be seen that in practical applications, using the solution of the present invention, first by marshalling switch and capacitor to three-phase injustice
Electric current progress of weighing is Passively compensated, then by obtaining module, controller, three-level current transformer and drive module to three-phase imbalance
Electric current carries out active compensation, can more precisely reduce tri-phase unbalance factor, the electric current of grid side is made to reach three-phase equilibrium shape
State, while negative sequence component and zero-sequence component are eliminated, power supply quality can be improved, improve the stability of electric power netting safe running.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of three-phase imbalance regulating device provided by the present invention；
Fig. 2 is a kind of partial structural diagram of three-phase imbalance regulating device provided by the present invention；
Fig. 3 is a kind of schematic diagram of three-phase imbalance regulating device provided by the present invention；
Fig. 4 is the partial structural diagram of another three-phase imbalance regulating device provided by the present invention；
Fig. 5 is the partial structural diagram of another three-phase imbalance regulating device provided by the present invention；
Fig. 6 is the structural schematic diagram of another three-phase imbalance regulating device provided by the present invention.
Specific embodiment
Core of the invention is to provide a kind of three-phase imbalance regulating device, carries out first to three phase unbalance current passive
Then compensation carries out active compensation to three phase unbalance current, so that the electric current of grid side is reached three-phase equilibrium state, eliminate simultaneously
Fall negative sequence component and zero-sequence component, power supply quality can be improved, improves the stability of electric power netting safe running.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural schematic diagram of three-phase imbalance regulating device provided by the present invention, including：
For obtaining the acquisition module 1 of the current signal of power grid, controller 2, three-level current transformer 3, drive module 4 is more
A capacitor C and marshalling switch 5；
Specifically, three-phase imbalance regulating device provided by the present invention includes two parts：It is passive uneven benefit respectively
Repay part and active unbalance compensation part.Passive imbalance compensation part is by controller 2, multiple capacitor C and marshalling switch 5
It constitutes, active unbalance compensation part is made of acquisition module 1, controller 2, three-level current transformer 3, drive module 4, specific
For structure referring to shown in Fig. 2, the three-level current transformer in the present invention is one kind by IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) power device composition diode clamp bit-type three-level inverter circuit, accordingly
, drive module 4 is IGBT drive module.Wherein, the capacitor C of passive imbalance compensation part includes low-voltage power and capacitance
Device.
Controller 2, it is each alternate for being accessed capacitor C by marshalling switch 5, to shift each alternate active electricity
Stream；It is also used to analyze current signal, obtains positive-sequence component, negative sequence component and the zero-sequence component of out-of-balance current, according to positive sequence point
Amount, negative sequence component and zero-sequence component generate driving signal；
Specifically, flying capcitor can be in two alternate transfer watt currents, specifically, ginseng between two-phase according to Wang Shi theorem
According to shown in Fig. 3, capacitor C is connected across between A phase and B phase, and the both ends capacitor C are line voltage, in terms of A phase, the electric current of capacitor C
90 ° of the advanced line voltage Uab of Ica, Ica can resolve into two parts, a part is 90 ° of advanced Ua capacity current Iac, and one
It is divided into the watt current Iar contrary with Ua, it is meant that the watt current of A phase is reduced, in terms of B phase, the electric current of capacitor C
90 ° of the advanced line voltage Uba of Icb, Icb can resolve into two parts, a part is 90 ° of advanced Ub capacity current Ibc, and one
It is divided into watt current Ibr identical with the direction Ub, it is meant that the watt current of B phase increases.Therefore it is bridged between A phase and B phase
Not only there is capacitive reactive power electric current in A phase and B phase, and a part of watt current can be transferred to B from A phase in capacitor C
Phase considers so far, and referring to shown in Fig. 4, the present invention controls the marshalling switch 5 of designed, designed in each alternate throwing by controller 2
Enter the capacitor C of inequality, so that any hybrid junction of capacitor C inequality, to shift three alternate watt currents, by burden with power
Three-phase is evenly distributed to up, to achieve the purpose that adjust three phase unbalance current.
Drive module 4, for after receiving driving signal, driving three-level current transformer 3 to be exported and negative sequence component and zero
The reversed compensation electric current of order components.
Specifically, the present invention first controls Passively compensated part operation by controller 2, certain out-of-balance current is compensated,
Then the operation of active compensation part is controlled again, is compensated remaining out-of-balance current, is more precisely reduced tri-phase unbalance factor.Have
Source compensation part uses advanced power electronic technique and Digital Signal Processing, drives three-level current transformer 3, and output is continuous
Controllable compensation electric current cooperates Passively compensated part to work, the whole compensation precision for improving three-phase imbalance regulating device.
Specifically, the current signal of 2 pairs of the controller load-sides for obtaining the power grid that module 1 obtains is analyzed, electricity is judged
Force system whether there is out-of-balance current, if so, isolating the positive-sequence component in out-of-balance current using advanced control algorithm, bearing
Order components and zero-sequence component, then controller 2 passes through the IGBT power device in drive module 4 in real time driving three-level current transformer 3
Part finally makes so that three-level current transformer 3 can export the compensation electric current reversed with negative sequence component and zero-sequence component and be offset
The electric current of the grid side of power grid reaches three-phase equilibrium state.
Wherein, voltage, current signal that module 1 is used to detect power grid are obtained, can specifically include the simulation of acquisition power grid
The sampling unit of current/voltage signal, and analog current signal is converted to the A/D converting unit of digital current signal, wherein
Sampling unit can be the sensor of acquisition current/voltage signal or acquisition chip etc., and collected analog current signal is led to
It crosses A/D converting unit and is converted to digital current signal, and input controller 2, by filtering, amplification, operation etc. in controller 2
Processing, obtains the real-time unbalanced component of power grid, i.e. positive-sequence component, negative sequence component and zero-sequence component.
The present invention provides a kind of three-phase imbalance regulating devices, including：For obtaining the acquisition of the current signal of power grid
Module, controller, three-level current transformer, drive module, multiple capacitors and marshalling switch；Controller, for being opened by marshalling
Pass capacitor is accessed it is each alternate, to shift each alternate watt current；It is also used to analyze current signal, obtains imbalance
Positive-sequence component, negative sequence component and the zero-sequence component of electric current generate driving letter according to positive-sequence component, negative sequence component and zero-sequence component
Number；Drive module, for after receiving driving signal, driving three-level current transformer output to be anti-with negative sequence component and zero-sequence component
To compensation electric current.
As it can be seen that in practical applications, using the solution of the present invention, first by marshalling switch and capacitor to three-phase injustice
Electric current progress of weighing is Passively compensated, then by obtaining module, controller, three-level current transformer and drive module to three-phase imbalance
Electric current carries out active compensation, can more precisely reduce tri-phase unbalance factor, the electric current of grid side is made to reach three-phase equilibrium shape
State, while negative sequence component and zero-sequence component are eliminated, power supply quality can be improved, improve the stability of electric power netting safe running.
On the basis of the above embodiments：
Embodiment as one preferred, controller 2 are also used to, and capacitor C is accessed each phase zero by marshalling switch 5
Between, to compensate each alternate reactive power.
Specifically, in the system of three-phase and four-line, capacitor C is connect in different phase lines to zero curve according to Wang Shi theorem
Between, it can offset neutral line current.Therefore, referring to Figure 5, the application puts into the compensation electricity for having different capabilities between phase zero
Hold, to compensate the reactive power between each phase, increase power factor.
Embodiment as one preferred analyzes current signal, obtain the positive-sequence component of out-of-balance current, negative sequence component and
The process of zero-sequence component is specially：
Fourier decomposition is carried out to current signal and obtains positive-sequence component, negative sequence component and the zero-sequence component of out-of-balance current.
Specifically, controller 2 extracts idle ingredient when analyzing current signal, according to Instantaneous Power Theory, lead to
It crosses quick Fourier decomposition and separates harmonic wave with fundamental wave, analyze positive-sequence component, negative sequence component and the zero sequence point of out-of-balance current
Amount.
Fig. 6 is please referred to, Fig. 6 is the structural schematic diagram of another three-phase imbalance regulating device provided by the present invention, should
Three-phase imbalance regulating device is on the basis of the above embodiments：
Embodiment as one preferred, the three-phase imbalance regulating device further include：
The filter module being connect with three-level current transformer 3, for eliminating the high frequency spurs in compensation electric current.
Embodiment as one preferred, filter module include multiple direct current flat wave capacitors and LCL filter 6.
Specifically, in the compensation electric current exported in view of three-level current transformer 3, it is understood that there may be AC compounent, therefore, this Shen
Direct current flat wave capacitor please be additionally provided with, the AC compounent being superimposed upon on DC compensation electric current is limited to a certain specified value, is kept whole
Galvanic electricity stream is continuous, reduces pulsation of current value, the harmonic wave for inhibiting three-level current transformer 3 to generate, in addition, compensation electric current is exported to power grid
Therefore side is also in series with LCL filter 6 between three-level current transformer 3 and grid side, eliminate high frequency spurs, referring to Fig. 6 institute
Show.
Embodiment as one preferred, controller 2 include Digital Signal Processing dsp controller 2.
Embodiment as one preferred, controller 2 further include field programmable gate array FPGA.
Specifically, controller 2 of the invention uses high-speed dsp (Digital Signal Processing, digital signal
Processing) and FPGA (Field-Programmable Gate Array, field programmable gate array) composition combined controller,
DSP processing speed is fast, and FPGA control ability is strong, is analyzed by the two combination current signal, obtains out-of-balance current
Positive-sequence component, negative sequence component and zero-sequence component, and calculated according to positive-sequence component, negative sequence component, zero-sequence component negative for compensating
The size of order components and the compensation electric current of zero-sequence component, generates SVPWM signal corresponding with the compensation size of current, to drive
Dynamic model block 4 drives corresponding IGBT power device ON/OFF in three-level current transformer 3 after receiving the SVPWM signal,
To export the compensation electric current.
Embodiment as one preferred, three-phase imbalance regulating device further include：
Communication interface 7, for being communicated with host computer.
Embodiment as one preferred, communication interface 7 are RS485 communication interface.
Specifically, three-phase imbalance regulating device provided by the present invention further includes communication interface 7, so that host computer is to more
A module unified management.Communication interface 7 can be connect using the RS485 communication that anti-common mode interference ability is strong, noise immunity is good
Mouthful, and due to the electrical characteristic of RS485 communication interface：Its interface signal level is low, can be with TTL (Transistor-
Transistor Logic, logic gates) level it is compatible, can facilitate and therefore be communicated using RS485 with TTL circuit connection
Interface 7, be more convenient for each power cell and man-machine interface communication, centralized control.
Shown in sum up, a kind of three-phase imbalance regulating device provided by the present invention passes through its passive imbalance compensation part
Certain out-of-balance current and whole reactive powers can be compensated, remaining injustice is compensated by its active unbalance compensation part
Weigh electric current, so that the electric current of grid side is quickly and accurately reached three-phase equilibrium state, so as to be effectively reduced transformer copper loss
And iron loss, alleviate transformer overload situation, reduces the probability that distribution transformer is single-phase or two-phase overload is burnt；In addition, this
Invention eliminates negative sequence component and zero-sequence component, improves power supply quality, improves the stability of electric power netting safe running, make power grid
The electric current of side reaches three-phase equilibrium state, reduces neutral current and heating problem, extends the electrical equipment service life, and raising is set
Standby service efficiency.A kind of three-phase imbalance regulating device provided by the present invention uses modularized design, small in size, light-weight,
Power density is high, and structure is unified, convenient for installation and maintenance, and can multiple module paralleling operation, unified standard communication interface is provided
7, facilitate centralized management to monitor.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of three-phase imbalance regulating device, which is characterized in that including：
For obtaining the acquisition module of the current signal of power grid, controller, three-level current transformer, drive module, multiple capacitors
And marshalling switch；
The controller, it is each alternate for being accessed the capacitor by the marshalling switch, to shift each phase
Between watt current；It is also used to analyze the current signal, obtains positive-sequence component, negative sequence component and the zero sequence point of out-of-balance current
Amount generates driving signal according to the positive-sequence component, the negative sequence component and the zero-sequence component；
The drive module, for after receiving the driving signal, driving the three-level current transformer output to bear with described
Order components and the reversed compensation electric current of the zero-sequence component.
2. three-phase imbalance regulating device according to claim 1, which is characterized in that the controller is also used to, and is passed through
Between the capacitor is accessed each phase zero by the marshalling switch, to compensate each alternate reactive power.
3. three-phase imbalance regulating device according to claim 2, which is characterized in that the analysis current signal,
The process for obtaining the positive-sequence component of out-of-balance current, negative sequence component and zero-sequence component is specially：
Fourier decomposition is carried out to the current signal and obtains positive-sequence component, negative sequence component and the zero-sequence component of out-of-balance current.
4. three-phase imbalance regulating device according to claim 1, which is characterized in that the three-phase imbalance regulating device is also
Including：
The filter module being connect with the three-level current transformer, for eliminating the high frequency spurs in the compensation electric current.
5. three-phase imbalance regulating device according to claim 4, which is characterized in that the filter module includes multiple straight
Flow flat wave capacitor and LCL filter.
6. three-phase imbalance regulating device described in -5 any one according to claim 1, which is characterized in that the controller packet
Include Digital Signal Processing dsp controller.
7. three-phase imbalance regulating device according to claim 6, which is characterized in that the controller further includes that scene can
Programmed logic gate array FPGA.
8. three-phase imbalance regulating device according to claim 7, which is characterized in that the acquisition module includes：
Sampling unit, for acquiring the analog current signal of power grid；
A/D converting unit, for the analog current signal to be converted to digital current signal；
Then the process of the analysis current signal is specially：
Analyze the digital current signal.
9. three-phase imbalance regulating device according to claim 8, which is characterized in that the three-phase imbalance regulating device
Further include：
Communication interface, for being communicated with host computer.
10. three-phase imbalance regulating device according to claim 9, which is characterized in that the communication interface is logical for RS485
Communication interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810892008.1A CN108879739A (en) | 2018-08-07 | 2018-08-07 | A kind of three-phase imbalance regulating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810892008.1A CN108879739A (en) | 2018-08-07 | 2018-08-07 | A kind of three-phase imbalance regulating device |
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| CN201810892008.1A Pending CN108879739A (en) | 2018-08-07 | 2018-08-07 | A kind of three-phase imbalance regulating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494770A (en) * | 2018-12-29 | 2019-03-19 | 国网北京市电力公司 | A kind of three-phase load unbalance intelligent regulating device and method |
| CN113036776A (en) * | 2021-03-04 | 2021-06-25 | 儒能(山东)电力科技有限公司 | Draw-out type low-voltage switch cabinet power factor stepless compensation device and method |
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| CN207098621U (en) * | 2017-04-13 | 2018-03-13 | 国家电网公司 | A kind of central controlled power distribution station mixing compensation system and active compensation module |
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| CN101908767A (en) * | 2010-07-31 | 2010-12-08 | 哈尔滨威瀚电气设备股份有限公司 | Device for comprehensively compensating reactive power harmonics |
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| CN109494770A (en) * | 2018-12-29 | 2019-03-19 | 国网北京市电力公司 | A kind of three-phase load unbalance intelligent regulating device and method |
| CN113036776A (en) * | 2021-03-04 | 2021-06-25 | 儒能(山东)电力科技有限公司 | Draw-out type low-voltage switch cabinet power factor stepless compensation device and method |
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