CN105958518B - A kind of working method of low-voltage network circuit Real-time Balancing device - Google Patents
A kind of working method of low-voltage network circuit Real-time Balancing device Download PDFInfo
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Abstract
A kind of low-voltage network circuit Real-time Balancing device and its working method.It is related to a kind of current balancing device and its working method of mid ＆ low-voltage line.It can realize that the automatic Real-time Balancing of low-voltage network circuit solves the problems, such as three-phase current unbalance from the root cause.It is placed in step down side, including a host and several slaves, the host is electrically connected by triple line with the step down side, and current transformer is equipped in each phase of the triple line；The slave is placed between the step down side and several single-phase loads, and several single-phase loads are respectively connected on each slave.It can be with all the period of time to the three-phase current of low-voltage network busbar, each customer charge electric current is monitored under the electric current and each branch of each electricity consumption branch, reduce the loss of circuit, optimize the power quality of power grid, fundamentally solves the unbalanced state of threephase load, it is simple in structure, there is very high economy.
Description
Technical field
The present invention relates to the current balancing devices and its work side of field of electrical equipment more particularly to a kind of mid ＆ low-voltage line
Method.
Background technology
With the development of China's power distribution network and the variation of household electrical appliance, there are a large amount of single-phase loads in power distribution network, so
And the unbalanced of single-phase load distribution causes three-phase load unbalance as one in low-voltage network operation and maintenance than more prominent
The problem of.Three-phase load unbalance will increase grid loss, so that the supply voltage quality of heavily loaded phase in power distribution network is greatly reduced, make
It is reduced at the output of network distribution transformer, electric energy conversion efficiency declines.Due to early stage electrical reticulation design planning it is inconsiderate, in low-voltage distribution
In net system, there are a large amount of single-phase, asymmetric, non-linear, impact loads, it may appear that a large amount of single-phase loads concentrate on a phase or
The case where two-phase, these unbalanced loads can make distribution system generate three-phase imbalance, lead to power supply system three-phase voltage, electric current
Imbalance.
At present for there are two types of the solutions of power distribution network three-phase imbalance, when by worker routine test and according to
Experience removes Load adjustment, and equalization point is only conceived to balance at a small number of test points such as step down side outlet, needs a large amount of
Manpower and materials go, and effect also not enough significantly.
Second is that by installing power electronics reactive power compensator, pass through alternate reactive-load compensation side in distribution transformer low-pressure side
Formula adjusts three-phase load unbalance situation.For example, disclosed in State Intellectual Property Office 2015-11-18 one application No. is
2015105417951, the patent of invention of a kind of entitled distribution transformer three-phase current dynamic balancer and its working method
Application, essentially discloses including modular unit, current acquisition unit, remote communication unit and man-machine interaction unit.Module list
Member is parallel to power grid points of common connection；Modular unit includes LCL filters, inverter, driving circuit and center control
Device.Central controller, driving circuit, inverter and LCL filter are sequentially connected.Monitoring in real time reflects load comprehensively in real time
Current conditions are accurately fed back to central controller by situation in time, and central controller can in real time, dynamically, accurately
Three-phase load electric current is adjusted, the accuracy of dynamic current adjustment is improved；Flexibly increase and decrease the module that puts into operation, reduce product power consumption,
It is energy saving.But the program can only improve distribution transforming self problem to a certain extent, be unable to solve power distribution station low pressure
The three-phase load unbalance situation of circuit, and the cost is relatively high.
Therefore, interior on a large scale in order to meet low-voltage network, rapidly, accurate automatic three-phase balance suddenly needs
It is a kind of to acquire a large number of users information and the device of energy real-time control low-voltage network three-phase balance work side
Method.
Invention content
The present invention is in view of the above problems, provide a kind of automatic Real-time Balancing that can realize low-voltage network circuit from root
The low-voltage network circuit Real-time Balancing device and its working method of three-phase current unbalance are solved the problems, such as on source.
The technical scheme is that：A kind of low-voltage network circuit Real-time Balancing device, is placed in step down side, packet
A host and several slaves are included, the host is electrically connected by triple line with the step down side, the triple line
It is equipped with current transformer in each phase；The slave is placed between the step down side and several single-phase loads, each
Several single-phase loads are respectively connected on the slave.
The host includes main control chip, power line carrier module, interactive controlling screen and three current Hall sensors, three
The current Hall sensor is connected respectively the current transformer in triple line, three current Hall sensor difference
It is connect with main control chip；
The main control chip is connect with power line carrier module, and both-way communication is realized with the power line carrier module；
The interactive controlling screen is connect by the power line carrier module with the main control chip.
The slave includes slave chip, three bidirectional thyristors and three mechanical switch, is divided on each bidirectional thyristor
A mechanical switch not in parallel；
Each phase of triple line is separately connected the input terminal of a bidirectional thyristor, the output of three bidirectional thyristors
It is connected with load after end is in parallel, the firewire as single-phase load；
The slave chip is connect with the main control chip by power line carrier module；
The gate pole and mechanical switch of the bidirectional thyristor are connect with the slave chip respectively.
Further include main website, the main website is connect with the power line carrier module, receives the information that power line carrier module is sent.
The power line carrier module is connect with the ammeter each loaded, reads load current information.
A kind of working method of low-voltage network circuit Real-time Balancing device, works as follows：
1）Pre-detection before work；
1.1）Main control chip sends test signal to each section, and whether test various pieces are normal, then go to step if normal
2）, 1.2 are gone to step if abnormal）；
1.2）By fault point in tactile screen display, staff is notified to overhaul, while by host lock,
1.3）Fault message is sent to main website, is achieved by main website；
2）Degree of unbalancedness judges；
2.1）The value range of degree of unbalancedness is written by touch screen；
2.2）Host schedules part obtains the three-phase electricity flow valuve of main circuit by Hall sensor；
2.3）The three-phase electricity flow valuve detected is compared with standard value, obtains the practical degree of unbalancedness of every phase；
2.4）The switching current values for needing to switch are calculated according to practical degree of unbalancedness；
2.5）Practical degree of unbalancedness is compared with the value range of setting, step 3 is then transferred to if more than value range, if small
Step 2 is then repeated in value range）；
3）Eliminate three-phase imbalance；
3.1）The current value of main control chip acquisition load, calculates the actual current value of each slave；
3.2）The actual current value of each slave is compared one by one with switching current values, is selected with switching current values most
Close slave；
3.3）Switch step 3.2）In the immediate slave selected so that three-phase current reaches balance, finishes.
The band in triple line being adjusted using main control chip real time monitoring in the present invention and carrying situation, three-phase current is allowed to reach flat
Weighing apparatus so that the power supply quality of full supplying power allocation range is optimized, and it is excessive utmostly to solve tri-phase unbalance factor in power distribution network
The problem of, powerful bidirectional thyristor has been selected to reduce the use number of slave, has been reduced needed for installation slave
Manpower and materials.Using power line carrier module as the communication module of device, circuit need not be in addition built, it is cost-effective.Also set
There is interactive controlling screen, the size of current of branch and the size of current of each customer charge where it can show slave, and
It can be set by the user the switching time of each slave and the switching working mode of automatic or manual, to adapt to different works
Make environment, allows entire three-phase imbalance process visualization.Can also fault point be made to visualize simultaneously, inspection is searched convenient for staff
It repaiies, improves working efficiency.
Slave is made of bidirectional thyristor and mechanical switch, and mechanical switch is in parallel with bidirectional thyristor, the guide when disconnecting
Pass two-way thyristor so that it is not charged on mechanical switch, mechanical switch is then disconnected again so that mechanical switch will not when disconnecting
Electric arc is generated, the service life of mechanical switch is extended, to extend the service life of whole device.Utilize bidirectional thyristor
Bidirectional conduction function so that alternating current can pass through in time, and two-phase thyristor belongs to wholly-controled device, and conducting shutdown can
Control, and high sensitivity, low energy consumption so that device fast response time, time length and safety and stability.
The present apparatus can be with all the period of time to the three-phase current of low-voltage network busbar, the electric current of each electricity consumption branch and each
Each customer charge electric current is monitored under branch, and scheduling is switched over as unit of by branch, realizes distribution in a wide range of
The three-phase balance of busbar greatly reduces the loss of circuit, optimizes the power quality of power grid, and by integrating user
Information acquisition system, the electric current by collecting each customer charge from electric energy meter reduce the usage amount of current transformer, together
When decrease a large amount of hardware interface, to improve the reliability of device, also improve the autgmentability of device, have higher
Application value and economic results in society.Distribution transforming self problem can only be improved to a certain extent in the prior art by avoiding,
It is unable to solve the threephase load imbalance situation of power distribution station low-voltage circuit, and the defect that the cost is relatively high, due to
The present apparatus can switch single-phase load in triple line, and to realize that three facies tracts carry balance, it is negative fundamentally to solve three-phase
Unbalanced state is carried, it is simple in structure, there is very high economy.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention,
Fig. 2 is apparatus of the present invention principle of compositionality block diagram,
Fig. 3 is slave electrical schematic diagram in the present invention,
Fig. 4 is utility model works method flow diagram；
1 is transformer in figure, and 2 be current transformer, and 3 be slave, and 31 be mechanical switch, and 32 be bidirectional thyristor.
Specific implementation mode
The present invention is as shown in Figs 1-4, is placed in step down side, including a host and several slaves, and the host is logical
It crosses triple line to be electrically connected with the step down side, current transformer is equipped in each phase of the triple line；It is described from
Machine is placed between the step down side and several single-phase loads, and several single-phase loads are respectively connected on each slave.
Current conditions in triple line are acquired by host, unbalanced power supply state is monitored in real time, is disposed in time convenient for host.Host computer control
Slave switches over, and eliminates unbalanced power supply state as possible.
The host includes main control chip, power line carrier module, interactive controlling screen and three current Hall sensors, three
The current Hall sensor is connected respectively the current transformer in triple line, i.e., the current transformer connected in A phases with
One of current Hall sensor connects, and the current transformer connected in B phases is connect with another current Hall sensor, C
The current transformer connected in phase is connect with third current Hall sensor, three current Hall sensors respectively with master
Control chip connection；Current transformer acquires the current signal in triple line, and the current signal of collected consecutive variations is passed
It is defeated in corresponding current Hall sensor, the current signal of consecutive variations is converted into main control chip energy by current Hall sensor
The digital signal enough identified provides current data for host computer control, is handled, is judged convenient for main control chip.
The main control chip is connect with power line carrier module, and both-way communication is realized with the power line carrier module；The friendship
Mutual control flow is connect by the power line carrier module with the main control chip.Main control chip carries relevant information by electric power
Wave module transfer to interactive controlling screen display comes out so that staff can intuitively observe electric network state and can be timely
Call relevant information.Staff can also manually control the switching of slave by interactive controlling screen so that work is obeyed in switching
Personnel need, when a wherein phase breaks down, staff can by interactive controlling screen by a faulty phase from
Machine averagely switches in other two-phase so that and it is unloaded in a faulty phase, facilitate staff to overhaul, and the not shadow in maintenance
Ring power supply.
As shown in figure 3, the slave includes three bidirectional thyristors and three mechanical switch, divide on each bidirectional thyristor
A mechanical switch not in parallel；Bidirectional thyristor may be considered the integrated of the triode thyristor that a pair of of inverse parallel is coupled,
Its working method is identical with triode thyristor, there is gate signal triggering and conducting.When host sends out switching command, slave to slave
Internal controller can be such that bidirectional thyristor is connected in positive and negative both direction when bidirectional thyristor gate pole adds trigger signal.
Mechanical switch is in parallel with bidirectional thyristor, disconnect when guide's pass two-way thyristor so that on mechanical switch without
Then electricity disconnects mechanical switch again so that mechanical switch not will produce electric arc when disconnecting, and extend mechanical switch uses the longevity
Life, to extend the service life of whole device.Utilize the bidirectional conduction function of bidirectional thyristor so that alternating current can
Pass through in time, and two-phase thyristor belongs to wholly-controled device, conducting shutdown is controllable, and high sensitivity, and low energy consumption so that device
Fast response time, time length and safety and stability.
The slave chip is connect with the main control chip by power line carrier module；The gate pole of the bidirectional thyristor and
Mechanical switch is connect with the slave chip respectively.Main control chip sends switching command to slave chip, and slave chip receives
Closure or ON- and OFF- command are sent out to mechanical switch after instruction, while sending gate pole trigger signal and corresponding mechanical switch is connected
Or disconnect, while respective thyristor break-make is controlled, complete switching command.In this way so that slave chip has shared the duty of main control chip
It can so that main control chip only has operation, judgement and the function of sending switching command, to improve the response speed of main control chip
Degree so that switching action speed faster, improves the working efficiency of device.
The switching principle of slave is, by taking A phases are switched to B phases as an example, described switching substantially refers to not powered off in load
In the case of disconnect the mechanical switch of A phases and be closed at the mechanical switch of B phases, can in actual conditions mechanical switch make and break process not
Controllably, load power down can be made too long with closure interval by disconnecting, and interval is too short to will produce A, B phase short circuit, to which switching be not achieved
Requirement, and the disconnection of mechanical switch also will produce the service life of electric arc influence mechanical switch.
In parallel with mechanical switch with bidirectional thyristor, when needing switching, host provides switching command first, at this point, slave
Switching command is received, slave chip sends out gate pole trigger signal, the bidirectional thyristor in A phases to the bidirectional thyristor in A phases
It is connected, slave chip sends out the instruction of the mechanical switch in shutdown A phases at this time.When A phases disconnect, electric current stream all flows through A phases
Thyristor disconnects the mechanical switch of A phases, not will produce electric arc at this time, so that A phase thyristors are disconnected removing gate pole trigger signal
It opens, control safe interval time makes B phase turn on thyristors to B phase gate circuit transistor gate trigger signals, in the machinery for being closed B phases
Switch completes switching, removes A phase gate circuit transistor gate signals by control and to B phase gate circuit transistor gate signal intervals so that
The mutual switching between A, B phase is realized in the case where load does not power off and is not short-circuit.Due in mechanical switch open and close
When mechanical switch on it is not charged due to bidirectional thyristor cannot lead to for a long time high current power supply, so in the bidirectional thyristor of B phases
The mechanical switch being closed in B phases is needed after conducting, bidirectional thyristor long-time high current is avoided to be connected, and two-phase thyristor is caused to damage
It is bad, extend service life.
After the completion of switching, by switching state（The on off operating mode of each bidirectional thyristor and the on off operating mode of mechanical switch）
It is transmitted to host by slave chip so that main website can obtain switching state by host, establish historical archives, facilitate work
Personnel consult analysis.
Each phase of triple line is separately connected the input terminal of a bidirectional thyristor, the output of three bidirectional thyristors
It is connected with load after end is in parallel；It inputs four lines in this way and exports both threads so that load can be in triple line is any one
Switch in phase, realizes current balance type, safeguard power grid security, pass through the switching being supported in triple line so that the band in triple line
Balance is carried, fundamentally solves the state of three-phase imbalance.Distribution transforming self problem can only be improved to a certain extent by avoiding,
It is unable to solve the problem of the three-phase load unbalance situation of power distribution station low-voltage circuit and the cost is relatively high.
Further include main website, the main website is connect with the power line carrier module, receives the information that power line carrier module is sent.
Power line carrier module described in main website is connect with the ammeter each loaded, reads load current information.Main website is for receiving master control core
Piece action message each time（Including fault message and handover information）, it establishes historical data base and is convenient for staff's query analysis,
Realize the purpose of remote monitoring.
A kind of working method of low-voltage network circuit Real-time Balancing device, as shown in figure 4, working as follows：
1）Pre-detection before work；Find that simple fault such as communication failure, reduces device at work by pre-detection
The probability to break down.
1.1）Main control chip sends test signal to each section, and whether test various pieces are normal, then go to step if normal
2）, 1.2 are gone to step if abnormal）；I.e. whether testing communication system is normal, and whether test mechanical switch and two-phase thyristor can
Whether enough normally shutdowns, test interactive controlling screen normally show.
1.2）By fault point in interactive controlling screen display, staff is notified to overhaul, while by host lock；Work people
Member directly can understand fault point from interactive controlling screen, targetedly carry out troubleshooting maintenance, shorten the repair time, improve work
Efficiency.
1.3）Fault message is sent to main website, is achieved by main website；Establishing to achieve facilitates staff to carry out failure
It analyzes and perfect, avoids repeating same failure.
2）Degree of unbalancedness judges；Degree of unbalancedness is judged by the current value detected in real time, to the foundation as switching.
2.1）The standard value of degree of unbalancedness is written by touch screen；Degree of unbalancedness is positive value, when a wherein phase is super in triple line
I.e. judgement degree of unbalancedness is excessive when going out, and needs to switch over.
2.2）Host schedules part obtains the three-phase electricity flow valuve of main circuit by Hall sensor；Pass through actual three-phase electricity
Flow valuve compares to obtain actual degree of unbalancedness with standard current value.
2.3）The three-phase electricity flow valuve detected is compared with standard value, obtains the practical degree of unbalancedness of every phase；
With the standard value 15% of degree of unbalancedness, for the standard current value per phase is 100A, it is assumed that A phases are 120A, and B phases are
80A then subtracts standard current value 100A with the actual current value 120A of A phases and show that difference for 20A, is divided by with standard current value
It is 20% to go out practical degree of unbalancedness, exceeds standard value 15%, and B phases show that practical degree of unbalancedness is 20%, need to switch at this time,
Otherwise it need not switch over.
2.4）The switching current values for needing to switch are calculated according to practical degree of unbalancedness；By taking A phases 120A, B phase 80A as an example,
Normalized current is subtracted with A phase actual current values and is worth to 20A, then it represents that A phases, which need to cut out 20A, can reach balance, with B phases
Actual current value 80A subtracts standard current value 100A and obtains -20A, shows that B phases need incision 20A to can be only achieved balance, at this time
The 20A gone out is switching current values,
2.5）Practical degree of unbalancedness is compared with the standard value of degree of unbalancedness, step 3 is then transferred to if more than value range,
Step 2 is repeated if being less than value range）；Practical degree of unbalancedness is compared with the standard value of degree of unbalancedness, be above standard value
It indicates to need to switch over otherwise just not switch over so that operation of power networks is more rationally economical, reduces device action
Number extends service using life.
3）Eliminate three-phase imbalance；Make power grid more safety and stability
3.1）The current value of main control chip acquisition load, calculates the actual current value of each slave；
3.2）The actual current value of each slave is compared one by one with switching current values, is selected with switching current values most
Close slave；
3.3）Switch step 3.2）In the immediate slave selected so that three-phase current reaches balance, finishes.
Claims (5)
1. a kind of working method of low-voltage network circuit Real-time Balancing device, the Real-time Balancing device are placed in transformer low voltage
Side, the Real-time Balancing device include a host and several slaves, and the host passes through triple line and the transformer low voltage
Side is electrically connected, and current transformer is equipped in each phase of the triple line；The slave be placed in the step down side with
Between several single-phase loads, several single-phase loads are respectively connected on each slave；
It is characterized in that, working as follows：
1）Pre-detection before work；
1.1）Main control chip sends test signal to each section, and whether test various pieces are normal, then go to step 2 if normal）If
It is abnormal, go to step 1.2）；
1.2）By fault point in tactile screen display, staff is notified to overhaul, while by host lock,
1.3）Fault message is sent to main website, is achieved by main website；
2）Degree of unbalancedness judges；
2.1）The value range of degree of unbalancedness is written by touch screen；
2.2）Host schedules part obtains the three-phase electricity flow valuve of main circuit by Hall sensor；
2.3）The three-phase electricity flow valuve detected is compared with standard value, obtains the practical degree of unbalancedness of every phase；
2.4）The switching current values for needing to switch are calculated according to practical degree of unbalancedness；
2.5）Practical degree of unbalancedness is compared with the value range of setting, step 3 is then transferred to if more than value range）If being less than
Value range then repeats step 2）；
3）Eliminate three-phase imbalance；
3.1）The current value of main control chip acquisition load, calculates the actual current value of each slave；
3.2）The actual current value of each slave is compared one by one with switching current values, is selected closest with switching current values
Slave；
3.3）Switch step 3.2）In the immediate slave selected so that three-phase current reaches balance, finishes.
2. a kind of working method of low-voltage network circuit Real-time Balancing device according to claim 1, which is characterized in that
The host includes main control chip, power line carrier module, interactive controlling screen and three current Hall sensors, three electric currents
Hall sensor is connected respectively the current transformer in triple line, three current Hall sensors respectively with master control core
Piece connects；
The main control chip is connect with power line carrier module, and both-way communication is realized with the power line carrier module；
The interactive controlling screen is connect by the power line carrier module with the main control chip.
3. a kind of working method of low-voltage network circuit Real-time Balancing device according to claim 2, which is characterized in that
The slave includes slave chip, three bidirectional thyristors and three mechanical switch, distinguishes parallel connection one on each bidirectional thyristor
A mechanical switch；
Each phase of triple line is separately connected the input terminal of a bidirectional thyristor, and the output end of three bidirectional thyristors is simultaneously
It is connected with load after connection, the firewire as single-phase load；
The slave chip is connect with the main control chip by power line carrier module；
The gate pole and mechanical switch of the bidirectional thyristor are connect with the slave chip respectively.
4. a kind of working method of low-voltage network circuit Real-time Balancing device according to claim 3, which is characterized in that
The balancing device further includes main website, and the main website is connect with the power line carrier module, receives what power line carrier module was sent
Information.
5. a kind of working method of low-voltage network circuit Real-time Balancing device according to claim 4, which is characterized in that
The power line carrier module is connect with the ammeter each loaded, reads load current information.
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| CN110537300A (en) * | 2017-04-21 | 2019-12-03 | 理想工业公司 | Low-voltage distribution system |
| CN107919673A (en) * | 2017-12-22 | 2018-04-17 | 山东邦世电气有限公司 | Phase-change switch type three-phase load self-checking device |
| CN111130129B (en) * | 2018-06-07 | 2021-03-02 | 安徽南瑞中天电力电子有限公司 | Multifunctional automatic phase-changing system for medium and low voltage line |
| US11804714B2 (en) | 2021-09-28 | 2023-10-31 | Saudi Arabian Oil Company | Intelligent system for controlling and monitoring the balance condition, harmonic, and leakage current in industrial and residential areas |
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| CN103545826B (en) * | 2012-07-09 | 2015-09-16 | 江西龙跃电子科技有限公司 | A kind of low voltage electric load intelligent dispensing system and distribution method |
| JP2016067124A (en) * | 2014-09-25 | 2016-04-28 | 株式会社日立製作所 | Power compensator and power compensation method |
| CN105207237A (en) * | 2015-09-22 | 2015-12-30 | 国网电网公司 | Distribution network three-phase load unbalance adjusting control system |
| CN205104911U (en) * | 2015-10-15 | 2016-03-23 | 扬州汇洁能电力电子设备有限公司 | Novel lossless balanced load of distributing type three -phase device |
| CN205753434U (en) * | 2016-06-28 | 2016-11-30 | 国网江苏省电力公司扬州供电公司 | Low-voltage network circuit Real-time Balancing device |
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2016
- 2016-06-28 CN CN201610490468.2A patent/CN105958518B/en active Active
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