CN205753434U - Low-voltage network circuit Real-time Balancing device - Google Patents
Low-voltage network circuit Real-time Balancing device Download PDFInfo
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- CN205753434U CN205753434U CN201620661618.7U CN201620661618U CN205753434U CN 205753434 U CN205753434 U CN 205753434U CN 201620661618 U CN201620661618 U CN 201620661618U CN 205753434 U CN205753434 U CN 205753434U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
Low-voltage network circuit Real-time Balancing device.Relate to the current balancing device of a kind of mid & low-voltage line.The automatic Real-time Balancing being capable of low-voltage network circuit solves three-phase current unbalance problem from root.Being placed in step down side, including a main frame and some from machine, described main frame is electrically connected with described step down side by triple line, each phase of described triple line is equipped with current transformer；Described it is placed between described step down side and some single-phase loads from machine, each described from machine, is respectively connected with some single-phase loads.Can all the period of time three-phase current to low-voltage network bus, under the electric current of each electricity consumption branch road and each branch road, each customer charge electric current is monitored, reduce the loss of circuit, optimize the quality of power supply of electrical network, fundamentally solve the unbalanced state of threephase load, simple in construction, has the highest economy.
Description
Technical field
This utility model relates to field of electrical equipment, particularly relates to the current balancing device of a kind of mid & low-voltage line.
Background technology
Along with development and the change of household electrical appliance of China's power distribution network, power distribution network exists substantial amounts of single-phase load, so
And single-phase load distribution unbalanced to cause three-phase load unbalance to become a ratio in low-voltage network operation maintenance more prominent
Problem.Three-phase load unbalance will increase grid loss, make the supply voltage quality of heavy duty phase in power distribution network be greatly reduced, make
Becoming the reduction of exerting oneself of network distribution transformer, electric energy conversion efficiency declines.Due to early stage electrical reticulation design planning inconsiderate, at low-voltage distribution
In net system, there is the most single-phase, asymmetric, non-linear, impact load, it may appear that a large amount of single-phase loads concentrate on a phase or
Biphase situation, these unbalanced loads can make distribution system produce three-phase imbalance, cause electric power system three-phase voltage, electric current
Imbalance.
At present the solution for power distribution network three-phase imbalance has two kinds, one be by workman routine test and according to
Experience removes Load adjustment, and equilibrium point is only conceived at the minority test points such as step down side outlet balance, and needs a large amount of
Manpower and materials go, and effect is the most notable.
Two is by installing power electronics reactive power compensator, in distribution transformer low-pressure side by alternate reactive-load compensation side
Formula adjusts three-phase load unbalance situation.Such as, an Application No. disclosed in State Intellectual Property Office 2015-11-18
2015105417951, entitled a kind of distribution transformer three-phase current dynamic balancer and the utility model of method of work thereof
Patent application, essentially discloses and includes modular unit, current acquisition unit, remote communication unit and man-machine interaction unit.Mould
Module unit is parallel to electrical network points of common connection；Modular unit includes LCL wave filter, inverter, drive circuit and central authorities' control
Device processed.Central controller, drive circuit, inverter and LCL filter are sequentially connected with.Monitoring in real time, reflection is negative the most comprehensively
Lotus situation, feeds back to central controller the most accurately by current conditions, and central controller can in real time, dynamically, precisely
Ground adjusts three-phase load electric current, improves the accuracy that dynamic current adjusts；Increase and decrease the module that puts into operation flexibly, reduce product merit
Consumption, saves the energy.But, the program can only improve distribution transforming self problem to a certain extent, is unable to solve power distribution station
The three-phase load unbalance situation of low-voltage circuit, and cost is of a relatively high.
Therefore, interior on a large scale in order to meet low-voltage network, rapidly, three-phase balance the most automatically, suddenly need
A kind of that can gather a large number of users information and that low-voltage network three-phase balance can be controlled in real time device.
Utility model content
This utility model is for problem above, it is provided that a kind of automatic Real-time Balancing being capable of low-voltage network circuit
The low-voltage network circuit Real-time Balancing device of three-phase current unbalance problem is solved from root.
The technical solution of the utility model is: low-voltage network circuit Real-time Balancing device, is placed in step down side, bag
Including a main frame and some from machine, described main frame is electrically connected with described step down side by triple line, described triple line
It is equipped with current transformer in each phase；Described it is placed between described step down side and some single-phase loads from machine, each
Described from machine, it is respectively connected with some single-phase loads.
Described main frame includes main control chip, power line carrier module, interactive controlling screen and three current Hall sensors, three
The current transformer that described current Hall sensor is connected respectively in triple line, three described current Hall sensors are respectively
It is connected with main control chip；
Described main control chip is connected with power line carrier module, realizes both-way communication with described power line carrier module；
Described interactive controlling screen is connected with described main control chip by described power line carrier module.
Described include from movement sheet, three bidirectional thyristors and three mechanical switchs from machine, on each bidirectional thyristor point
A described mechanical switch not in parallel；
Each phase of triple line connects the input of a bidirectional thyristor, the output of three described bidirectional thyristors respectively
It is connected, as the live wire of single-phase load with load after end parallel connection；
Described it is connected by power line carrier module with described main control chip from movement sheet；
The gate pole of described bidirectional thyristor and mechanical switch are connected from movement sheet with described respectively.
Also include that main website, described main website are connected with described power line carrier module, receive the information that power line carrier module sends.
Described power line carrier module is connected with the ammeter of each load, reads load current information.
The band utilizing main control chip to monitor in real time in regulation triple line in this utility model carries situation, allows three-phase current reach
Balance so that the power supply quality of full supplying power allocation scope is optimized, at utmost solves three-phase imbalance in power distribution network and spends
Big problem, has selected powerful bidirectional thyristor thus has decreased the use number from machine, decreases installation needed for machine
Manpower and materials.Utilize power line carrier module as the communication module of device, it is not necessary to additionally to build circuit, cost-effective.Also
Being provided with interactive controlling screen, it can show the size of current from machine place branch road, and the size of current of each customer charge, and
And each switching time from machine, and the switching working mode of automatic or manual can be set by the user, different to adapt to
Working environment, allows whole three-phase imbalance process visualization.It also is able to make trouble point visualize, it is simple to staff searches simultaneously
Maintenance, improves work efficiency.
Being made up of bidirectional thyristor and mechanical switch from machine, mechanical switch is in parallel with bidirectional thyristor, the guide when disconnecting
Pass two-way IGCT so that not charged on mechanical switch, disconnects mechanical switch the most again so that mechanical switch will not when disconnecting
Produce electric arc, extend the service life of mechanical switch, thus extend the service life of whole device.Utilize bidirectional thyristor
Two-way admittance function so that alternating current can pass through in time, and two-phase IGCT belongs to wholly-controled device, and conducting shutoff can
Control, and highly sensitive, energy consumption is low so that device fast response time, time length and safety and stability.
This device can all the period of time three-phase current to low-voltage network bus, the electric current of each electricity consumption branch road and each
Under branch road, each customer charge electric current is monitored, and is switching over scheduling in units of branch road, it is achieved distribution on a large scale
The three-phase balance of bus, greatly reduces the loss of circuit, optimizes the quality of power supply of electrical network, and by integrated user
Information acquisition system, decreases the usage amount of current transformer by collecting the electric current of each customer charge from electric energy meter, with
Time decrease substantial amounts of hardware interface, thus improve the reliability of device, also improve the autgmentability of device, have higher
Application value and economic results in society.Avoid and prior art can only be improved distribution transforming self problem to a certain extent,
It is unable to solve the threephase load imbalance situation of power distribution station low-voltage circuit, and the defect that cost is of a relatively high, due to
Single-phase load can be switched in triple line by this device, thus realize three facies tracts and carry balance, fundamentally solves three-phase and bears
Carry unbalanced state, simple in construction, there is the highest economy.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model,
Fig. 2 is this utility model device principle of compositionality block diagram,
Fig. 3 is from electrical-mechanical schematic diagram in this utility model,
Fig. 4 is utility model works method flow diagram；
In figure, 1 is transformator, and 2 is current transformer, and 3 is from machine, and 31 is mechanical switch, and 32 is bidirectional thyristor.
Detailed description of the invention
This utility model as Figure 1-3, is placed in step down side, including a main frame and some from machine, described master
Machine is electrically connected with described step down side by triple line, and each phase of described triple line is equipped with current transformer；Institute
State and be placed between described step down side and some single-phase loads from machine, each described be respectively connected with from machine some single-phase negative
Carry.Current conditions in triple line is gathered, in real time monitoring unbalanced power supply state, it is simple to main frame is disposed in time by main frame.Main frame
Control to switch over from machine, eliminate unbalanced power supply state as far as possible.
Described main frame includes main control chip, power line carrier module, interactive controlling screen and three current Hall sensors, three
The current transformer that described current Hall sensor is connected respectively in triple line, i.e. in A phase connect current transformer with
One of them current Hall sensor connects, and the current transformer that B phase connects is connected with another current Hall sensor, C
The upper current transformer connected and the 3rd current Hall sensor connection mutually, three described current Hall sensors respectively with master
Control chip connects；Current transformer gathers the current signal in triple line, and is passed by the continually varying current signal collected
Being passed on the current Hall sensor of correspondence, continually varying current signal is converted into main control chip energy by current Hall sensor
Enough digital signals identified, provide current data for host computer control, it is simple to main control chip carries out processing, judging.
Described main control chip is connected with power line carrier module, realizes both-way communication with described power line carrier module；Described friendship
Control panel is connected with described main control chip by described power line carrier module mutually.Relevant information is carried by main control chip by electric power
Ripple module transfer is to interactive controlling screen display out so that staff can observe electric network state and can be timely intuitively
Call relevant information.Staff can also be by interactive controlling screen Non-follow control from the switching of machine so that work is obeyed in switching
Personnel need, when wherein a phase breaks down, staff can by interactive controlling screen by an out of order phase from
Machine averagely switches on the most biphase so that unloaded in an out of order phase, facilitates staff to overhaul, and the not shadow when maintenance
Ring power supply.
Include three bidirectional thyristors and three mechanical switchs as it is shown on figure 3, described from machine, each bidirectional thyristor divides
A described mechanical switch not in parallel；Bidirectional thyristor may be considered the integrated of the triode thyristor of a pair inverse parallel connection,
Its working method is identical with triode thyristor, all has gate signal triggering and conducting.When main frame sends switching command to from machine, from machine
Internal controller can make bidirectional thyristor turn in positive and negative both direction when bidirectional thyristor gate pole adds triggering signal.
Mechanical switch is in parallel with bidirectional thyristor, disconnect time guide's pass two-way IGCT so that on mechanical switch without
Electricity, disconnects mechanical switch the most again so that mechanical switch will not produce electric arc when disconnecting, and extends the use longevity of mechanical switch
Life, thus extend the service life of whole device.Utilize the two-way admittance function of bidirectional thyristor so that alternating current can
Passing through in time, and two-phase IGCT belongs to wholly-controled device, conducting shutoff can control, and highly sensitive, and energy consumption is low so that device
Fast response time, time length and safety and stability.
Described it is connected by power line carrier module with described main control chip from movement sheet；The gate pole of described bidirectional thyristor and
Mechanical switch is connected from movement sheet with described respectively.Main control chip sends switching command to from movement sheet, receives from movement sheet
Instruct backward mechanical switch and send Guan Bi or ON-and OFF-command, send gate pole triggering signal simultaneously and corresponding mechanical switch is connected
Or disconnect, control respective thyristor break-make simultaneously, complete switching command.So make to have shared the duty of main control chip from movement sheet
Can so that main control chip only has computing, judges and send the function of switching command, thus improve the response speed of main control chip
Degree so that switching action speed faster, improves the work efficiency of device.
Being to be switched to as a example by B phase by A phase from the switching principle of machine, described switching essence refers to loading not power-off
In the case of disconnect the mechanical switch of A phase and be closed at the mechanical switch of B phase, can the make and break process of mechanical switch be in practical situation
Controlled, disconnect and Guan Bi was spaced and can make load power down for a long time, be spaced that too short to produce A, B phase short-circuit, thus do not reach switching
Requirement, and the disconnection of mechanical switch also can produce the life-span of electric arc influence mechanical switch.
In parallel with mechanical switch with bidirectional thyristor, when needing switching, first main frame provides switching command, now, from machine
Receive switching command, send gate pole from movement sheet to the bidirectional thyristor A phase and trigger signal, the bidirectional thyristor in A phase
Conducting, now sends the instruction of the mechanical switch turned off A phase from movement sheet.When A phase disconnects, electric current stream all flows through A phase
IGCT, now disconnects the mechanical switch of A phase, will not produce electric arc, removing gate pole triggering signal, A phase IGCT is broken
Opening, the interval time controlling safety makes B phase turn on thyristors, at the machinery of Guan Bi B phase to B phase gate circuit transistor gate triggering signal
Switch, completes switching, removes A phase gate circuit transistor gate signal and to B phase gate circuit transistor gate signal interval by control so that
Load not power-off and the most short-circuit in the case of realize between A, B phase mutual switching.Due at mechanical switch closed and disconnected
Time mechanical switch on not charged power owing to bidirectional thyristor can not lead to big electric current for a long time, so at the bidirectional thyristor of B phase
Need after conducting to close the mechanical switch in B phase, it is to avoid the biggest current lead-through of bidirectional thyristor, cause two-phase IGCT to damage
Bad, extend service life.
After having switched, by switching state (on off operating mode of each bidirectional thyristor and the on off operating mode of mechanical switch)
By transmitting to main frame from movement sheet so that main website can obtain switching state by main frame, set up historical archives, convenient work
Personnel consult analysis.
Each phase of triple line connects the input of a bidirectional thyristor, the output of three described bidirectional thyristors respectively
It is connected with load after end parallel connection；So four lines of input and export both threads so that load can any one in triple line
Upper switching mutually, it is achieved current balance type, safeguards power grid security, by the switching being supported in triple line so that the band in triple line
Carry balance, fundamentally solve the state of three-phase imbalance.Avoid and can only improve distribution transforming self problem to a certain extent,
It is unable to solve the three-phase load unbalance situation of power distribution station low-voltage circuit, and the problem that cost is of a relatively high.
Also include that main website, described main website are connected with described power line carrier module, receive the information that power line carrier module sends.
Power line carrier module described in main website is connected with the ammeter of each load, reads load current information.Main website is used for receiving master control core
Sheet action message each time (includes fault message and handover information), sets up historical data base and is easy to staff's query analysis,
Realize the purpose of remotely monitoring.
As shown in Figure 4, it is the method for work of a kind of low-voltage network circuit Real-time Balancing device, works as follows:
1) pre-detection before work；Find simple fault such as communication failure etc. by pre-detection, reduce in device busy
The probability broken down.
1.1) main control chip transmission test signal is to each several part, and test various piece is the most normal, if normal, goes to step
2), if abnormal, 1.2 are gone to step)；I.e. testing communication system is the most normal, and whether test mechanical switch and two-phase IGCT can
Enough normallies turn off, test interactive controlling screen the most normally display etc..
1.2) by trouble point in interactive controlling screen display, notify that staff overhauls, simultaneously by host lock；Work people
Member directly can understand trouble point from interactive controlling screen, carries out troubleshooting maintenance targetedly, shortens the repair time, improves work
Efficiency.
1.3) fault message is sent to main website, main website achieve；Setting up archive facilitates staff to carry out fault
Analyze and perfect, it is to avoid repeat same fault.
2) degree of unbalancedness judges；Degree of unbalancedness is judged by the current value detected in real time, thus as the foundation of switching.
2.1) by the standard value of touch screen write degree of unbalancedness；Degree of unbalancedness be on the occasion of, when in triple line wherein a phase surpass
Judge when going out that degree of unbalancedness is excessive, need to switch over.
2.2) host schedules part obtains the three-phase electricity flow valuve of main circuit by Hall element；By actual three-phase electricity
Flow valuve is with standard current value comparison thus obtains the degree of unbalancedness of reality.
2.3) the three-phase electricity flow valuve detected is compared with standard value, draw the actual degree of unbalancedness of every phase；
With the standard value 15% of degree of unbalancedness, as a example by the standard current value of every phase is 100A, it is assumed that A phase is that 120A, B phase is
80A, then actual current value 120A with A phase deducts standard current value 100A and show that difference, as 20A, is divided by with standard current value
Going out actual degree of unbalancedness is 20%, and beyond standard value 15%, B phase show that actual degree of unbalancedness is 20%, now needs to switch over,
Otherwise it is made without switching.
2.4) switching current values needing to switch is calculated according to actual degree of unbalancedness；With A phase 120A, as a example by B phase 80A,
Deduct normalized current with A phase actual current value and be worth to 20A, then it represents that A phase needs to cut out 20A can reach balance, with B phase
Actual current value 80A deducts standard current value 100A and obtains-20A, shows that B phase needs to cut 20A and can be only achieved balance, now
The 20A gone out is switching current values,
2.5) standard value of actual degree of unbalancedness with degree of unbalancedness is compared, if more than value range, proceeding to step 3,
If less than value range, repeating step 2)；The standard value of actual degree of unbalancedness with degree of unbalancedness being compared, be above standard value
I.e. represent that needs switch over the most not switch over so that operation of power networks is more rationally economical, reduces device action
Number, extension fixture service life.
3) three-phase imbalance is eliminated；Make electrical network more safety and stability
3.1) current value of main control chip collection load, calculates each actual current value from machine；
3.2) carry out comparison one by one by each from the actual current value of machine and switching current values, select with switching current values
Close from machine；
3.3) switch step 3.2) in select immediate from machine so that three-phase current reach balance, complete.
Claims (5)
1. low-voltage network circuit Real-time Balancing device, is placed in step down side, it is characterised in that if include a main frame and
Dry from machine, described main frame is electrically connected with described step down side by triple line, and each phase of described triple line is equipped with
Current transformer；Described it is placed between described step down side and some single-phase loads from machine, each described all connects from machine
It is connected to some single-phase loads.
Low-voltage network circuit Real-time Balancing device the most according to claim 1, it is characterised in that described main frame includes main
Control chip, power line carrier module, interactive controlling screen and three current Hall sensors, three described current Hall sensors are respectively
The corresponding current transformer connected in triple line, three described current Hall sensors are connected with main control chip respectively；
Described main control chip is connected with power line carrier module, realizes both-way communication with described power line carrier module；
Described interactive controlling screen is connected with described main control chip by described power line carrier module.
Low-voltage network circuit Real-time Balancing device the most according to claim 2, it is characterised in that described from machine include from
Movement sheet, three bidirectional thyristors and three mechanical switchs, a described mechanical switch the most in parallel on each bidirectional thyristor；
Each phase of triple line connects the input of a bidirectional thyristor respectively, and the outfan of three described bidirectional thyristors is also
It is connected, as the live wire of single-phase load with load after connection；
Described it is connected by power line carrier module with described main control chip from movement sheet；
The gate pole of described bidirectional thyristor and mechanical switch are connected from movement sheet with described respectively.
Low-voltage network circuit Real-time Balancing device the most according to claim 3, it is characterised in that also include main website, institute
State main website to be connected with described power line carrier module, receive the information that power line carrier module sends.
Low-voltage network circuit Real-time Balancing device the most according to claim 4, it is characterised in that described power carrier mould
Block is connected with the ammeter of each load, reads load current information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620661618.7U CN205753434U (en) | 2016-06-28 | 2016-06-28 | Low-voltage network circuit Real-time Balancing device |
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| CN201620661618.7U CN205753434U (en) | 2016-06-28 | 2016-06-28 | Low-voltage network circuit Real-time Balancing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958518A (en) * | 2016-06-28 | 2016-09-21 | 国网江苏省电力公司扬州供电公司 | Real-time balance device for low-voltage power distribution network line and working method thereof |
| CN110380436A (en) * | 2019-07-29 | 2019-10-25 | 盐城工学院 | The separate adjustment control method that do not have a power failure online that three-phase system powers to single-phase load |
-
2016
- 2016-06-28 CN CN201620661618.7U patent/CN205753434U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105958518A (en) * | 2016-06-28 | 2016-09-21 | 国网江苏省电力公司扬州供电公司 | Real-time balance device for low-voltage power distribution network line and working method thereof |
| CN110380436A (en) * | 2019-07-29 | 2019-10-25 | 盐城工学院 | The separate adjustment control method that do not have a power failure online that three-phase system powers to single-phase load |
| CN110380436B (en) * | 2019-07-29 | 2023-08-01 | 盐城工学院 | On-line non-stop phase adjustment control method for single-phase load power supply by three-phase power supply system |
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