CN106130048A - Platform district three-phase load and the method for user's terminal voltage balanced adjustment and device thereof - Google Patents
Platform district three-phase load and the method for user's terminal voltage balanced adjustment and device thereof Download PDFInfo
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- CN106130048A CN106130048A CN201610736405.0A CN201610736405A CN106130048A CN 106130048 A CN106130048 A CN 106130048A CN 201610736405 A CN201610736405 A CN 201610736405A CN 106130048 A CN106130048 A CN 106130048A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention belongs to field of electrical equipment, particularly relate to a kind of district's three-phase load and the method for user's terminal voltage balanced adjustment and device thereof.It is changed to and d. c. voltage signal that input ac voltage virtual value is linear including following effective procedure: a, by three-phase voltage is sampled；B, by three-phase voltage sampling obtained d. c. voltage signal compare, determine the highest phase of voltage；C, determine voltage Gao Xianghou, by its d. c. voltage signal by after delay circuit, be changed to rear class thyristor gating circuit control signal, and then by controlling controlled silicon conducting and cut-off, so that load switching is to the highest phase of voltage.Method provided by the present invention is novel, the problem solving three-phase load unbalance at root, and meanwhile, the apparatus structure that the present invention provides is simple, with low cost, institute's use components and parts are conventional components and parts.
Description
Technical field
The invention belongs to field of electrical equipment, particularly relate to a kind of platform district three-phase load and user's terminal voltage balanced adjustment
Method and device.
Background technology
Public power distribution station refers to be provided the supplier of electricity of power supply by separate unit or multiple stage distribution transformer for multiple users
Formula, this type of powering mode of the many employings in current China cities and towns and rural area, wherein, major part is separate unit three-phase transformer, the most
Individual power load the user less than 3 kilowatts provide single-phase 220 volts of life power supplys.This type of low-voltage power supply system applies in general to alone
Family load is little, has that real-time change is big, number of users is many, has a very wide distribution, the feature such as the more difficult control of distribution of three-phase load.This
Also resulting in distribution transforming three-phase load unbalance, user's terminal voltage changes greatly.And what distribution transformer three-phase load unbalance brought
Main harm has: 1, transformator undercapacity, it is impossible to reaches full capacity and powers, and wastes resource；2, cause transformator overheated and ferrum
Core is saturated, affects transformer life；3, user's quality of voltage is caused not reach requirement.
In order to solve above-mentioned technical problem, there has been proposed various improvement project, such as, State Intellectual Property Office
Disclose a kind of Intelligent interval stabilized voltage three-phase balance power-saving system { application number: 201020291240.9}, its technology solved
Scheme is, the input of three-phase equilibrium transformer is connected with voltage sensor, voltage sensor through A/D converter by input interface
Connecing input register, input register is connected with microcomputer CPU, and equipped with memorizer on microcomputer CPU, microcomputer CPU is connected to show through interface
Showing device, programmable device, microcomputer C PU outfan is connected with relay equipped with output register, output register, relay and three-phase
A.C. contactor on balancing transformer input, outfan is connected.
Also or State Intellectual Property Office with regard to disclosed low-voltage three-phase load imbalance phase order device application number:
201310581053.2}, including control circuit, Phase-switching mechanism, control circuit includes: the three-phase being made up of D1, D2, D3 is whole
Stream bridge, the bleeder circuit of R1, R2, R3, R4, R5, R6 group, the voltage comparator of IC1, IC2, IC3 composition, setting of D5, M2, R8 group
Definite proportion relatively potential circuit, Time-delayed trigger electrical equipment is made up of IC3, M1, R8, and what phase switcher K was responsible for three-phase voltage chooses work.
Although technique scheme has reached the purpose of voltage stabilizing to a certain extent, but still there is techniques below problem:
1, the balance using CPU to carry out transformer voltage controls, and causes production cost higher, then ignores the impression of user side, is unfavorable for
The power quality of user side；2, low-voltage three-phase load imbalance phase order device uses the rotation of machinery when voltage selects
Choosing, access time is long, the generation of user side power-off thing easily occurs, is unfavorable for the electric prospection of user side；3, low pressure
Three-phase load unbalance phase order device may produce erroneous judgement when three-phase voltage is close, causes switching voltage phase action, unfavorable
The technical problems such as the electric prospection in user side.
Summary of the invention
The present invention is directed to above-mentioned Three-Phase Transformer balancing the load and the technical problem of user's terminal voltage existence, propose
A kind of reasonable in design, method is simple, easy to process, with low cost and three-phase load can be balanced, improve the power quality of user
Platform district three-phase load and the method for user's terminal voltage balanced adjustment and device thereof.
In order to achieve the above object, the technical solution used in the present invention is, the present invention provide a kind of platform district three-phase load and
The method of user's terminal voltage balanced adjustment, including following effective procedure:
A, it is changed to and direct current that input ac voltage virtual value is linear by three-phase voltage is sampled
Voltage signal；
B, by three-phase voltage sampling obtained d. c. voltage signal compare, determine the highest phase of voltage；
C, determine voltage Gao Xianghou, by its d. c. voltage signal by after delay circuit, be changed to rear class controllable silicon and touch
Power Generation Road control signal, and then by controlling controlled silicon conducting and cut-off, so that load switching is to the highest phase of voltage.
As preferably, in described step c, determine voltage Gao Xianghou, utilize bleeder circuit and voltage interlock circuit to guarantee
The d. c. voltage signal of the highest phase of voltage enters delay circuit.
The present invention also provides for a kind of district's three-phase load and the device of user's terminal voltage balanced adjustment, including with three-phase electricity
Piezoelectricity connects and for switching the switch control module of three-phase voltage and for controlling the control circuit of switch control module,
Voltage sampling module that described control circuit includes being electrically connected with successively, preferential deliver select module, time delay deliver module and
Exporting preferential phase switching signal generator module, wherein, voltage sampling module for being connected sampling and by every phase with three-phase voltage
Voltage sampling is changed to the d. c. voltage signal linear with input ac voltage virtual value；Described preferential delivery selects mould
Block is for determining the highest phase in three-phase voltage and guaranteeing that only voltage the highest phase d. c. voltage signal is delivered to time delay delivery mould
Block；Described time delay is delivered module and is carried for delay signal；Described output preferential phase switching signal generator module is used for output three
Phase voltage switching signal is also sent to switch control module.
As preferably, also include for avoiding switch control module misoperation to cause the voltage detecting electricity of output phase fault
Road and output residual voltage locking protection module.
As preferably, also include the output HIGH voltage locking of commutation switching in the case of avoiding user's quality of voltage up to standard
Circuit.
As preferably, described switch control module includes and exports the light that preferential phase switching signal generator module is electrical connected
Coupling and the IGCT relay being electrical connected with optocoupler, described IGCT relay is used for connecting single-phase voltage and electricity consumption end.
Compared with prior art, advantages of the present invention and good effect are,
1, the present invention is by according to user side voltage behaviour in service, making for keeping away for user by adjusting switching ceiling voltage
Exempting from the technical problem that three-phase load unbalance is caused, method provided by the present invention is novel, solves three-phase load at root
Unbalanced problem, meanwhile, the apparatus structure that the present invention provides is simple, with low cost, institute's use components and parts are conventional unit device
Part, and by the setting of circuit, while voltage compares, selects ceiling voltage and carries out voltage mutually and switch mutually, make whole
Voltage switched mutually less than 0.04 second, was effectively protected the use of user side electrical equipment.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be some embodiments of the present invention, for ability
From the point of view of the those of ordinary skill of territory, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Platform district three-phase load that Fig. 1 provides for embodiment 2 and the structural principle of the device of user's terminal voltage balanced adjustment
Figure；
Platform district three-phase load that Fig. 2 provides for embodiment 2 and the circuit diagram of the device of user's terminal voltage balanced adjustment；
The circuit diagram of the voltage sampling module that Fig. 3 provides for embodiment 2；
The preferential circuit diagram delivering selection module that Fig. 4 provides for embodiment 2；
Fig. 5 delivers module for the time delay that embodiment 2 provides and exports the circuit diagram of preferential phase switching signal generator module；
Module and output HIGH voltage lock circuit are protected in the output residual voltage locking that Fig. 6 provides for embodiment 2.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the accompanying drawings and embodiment
The present invention will be further described.It should be noted that in the case of not conflicting, in embodiments herein and embodiment
Feature can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but, the present invention also may be used
Being different from other modes described here with employing to implement, therefore, the present invention is not limited to the concrete of description described below
The restriction of embodiment.
Embodiment 1, present embodiments provides platform district three-phase load and the method for user's terminal voltage balanced adjustment
By the research of three-phase imbalance platform district and all kinds of load point voltage is found: when Three-Phase Transformer Voltage unbalance
Time to be reflected in the leading indicator of load side be exactly that the heavier phase voltage of load is relatively low, this is also to cause terminal temperature difference voltage relatively low
Main cause, its numerical value and transformer load rate, three-phase imbalance rate are relevant with line equivalent resistance, according to this characteristic,
Present embodiments provide this district's three-phase load and the method for user's terminal voltage balanced adjustment.
First pass through the sampling to three-phase voltage, obtain the magnitude of voltage of real-time three-phase voltage, then sampling voltage is become
Turn to the d. c. voltage signal linear with input ac voltage virtual value, concrete, can mutual by fixing no-load voltage ratio
Sampling voltage is changed to d. c. voltage signal by sensor and current rectifying and wave filtering circuit, it should be noted that need individually to every electricity mutually
Pressure is changed.
Then, three-phase voltage the obtained d. c. voltage signal of sampling is compared, integrated comparator can be set herein
Circuit determines the highest phase of voltage, and during determining the highest phase, in order to avoid the change in voltage of little scope, (such as air-conditioning etc. are large-scale
The opening and closing of electrical appliance) cause frequent movement, in use, preferably with delivering phase Preferential Occupancy circuit, both other non-delivery phases
Voltage just can tie up delivery phase position higher than when delivering phase setting value (being typically set to 5 volts), and in the present embodiment, described is preferential
Occupy-place circuit is to be become bleeder circuit by resistor group, plays the effect put into Preferential Occupancy, and diode forms voltage interlock circuit,
Collectively form delivery phase Preferential Occupancy circuit, determine the highest phase of voltage, determine voltage Gao Xianghou, by its d. c. voltage signal
By delay circuit, the purpose of delay circuit is to hide the short time voltage change (change in short-term caused such as starting of air conditioner electric current
Change) to avoid frequent movement, d. c. voltage signal, by after delay circuit, is changed to rear class thyristor gating circuit and controls letter
Number, and then by controlling controlled silicon conducting and cut-off, so that load switching is to the highest phase of voltage.
By the utilization of said method, utilize the cooperation of circuit and electric elements, make the voltage value that user side is used
It is maintained at ceiling voltage, ensures the power quality of user side, meanwhile, by the switching of voltage phase, be also between three-phase voltage
Load reach a kind of poised state, make transformator reach full capacity to the full extent and power, it is to avoid waste resource, meanwhile,
It also avoid that transformator is overheated and core sataration, improve the service life of transformator.
Embodiment 2, the present embodiment provides a kind of district's three-phase load and the device of user's terminal voltage balanced adjustment:
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, this device includes being electrically connected with and for switching with three-phase voltage
The switch control module of three-phase voltage and for controlling the control circuit of switch control module, control circuit is mainly used in sending
Control signal opens control switch control module, and in the present embodiment, each phase of voltage is respectively connected with a switch control module,
And the voltage sampling module that control circuit includes being electrically connected with successively, preferential delivery select module, time delay to deliver module and defeated
Go out preferential phase switching signal generator module, also include for avoiding switch control module misoperation to cause the electricity of output phase fault
Commutation switching in the case of pressing testing circuit and output residual voltage locking protection module and being used for avoiding user's quality of voltage up to standard
Output HIGH voltage lock circuit, wherein, switch control module includes being electrical connected with the preferential phase switching signal generator module of output
Optocoupler and the IGCT relay that is electrical connected with optocoupler, IGCT relay is used for connecting single-phase voltage and electricity consumption end,
Utilizing the electricity of optocoupler, optical, electrical characteristic, transmission control signal is to IGCT relay, in the present embodiment, and IGCT relay
Switch for bidirectional thyristor non-contact electric.
Wherein, voltage sampling module for being connected sampling and the voltage sampling of every phase being changed to and inputted with three-phase voltage
The d. c. voltage signal that alternating voltage virtual value is linear, specifically, as shown in Figure 2 and Figure 3, voltage sampling module bag
Including the transformer being connected with single-phase voltage, in the present embodiment, transformer is the transformator with fixing no-load voltage ratio, and transformer is then
Being electrically connected with rectification silicon bridge, making change in voltage is d. c. voltage signal, more specifically, is to be become by every phase power-frequency voltage
In the present embodiment, and the linear d. c. voltage signal of virtual value refers to each the d. c. voltage signal of about 8.4 volts
The voltage variation ratio of phase is definite value.
And preferentially deliver and select the concrete effect of module to be the highest phase for determining in three-phase voltage and guarantee only electricity
Press the highest phase d. c. voltage signal be delivered to time delay deliver module, specifically, as shown in Figure 2, Figure 4 shows, this module concrete by
The electric elements such as operational amplifier, resistance and diode match to be formed and deliver phase Preferential Occupancy circuit, specifically, by transporting
Calculate the composition comparator circuit such as amplifier, resistance, for A phase voltage, first carry out other B, C two phase voltage and compare,
Determine the highest phase of voltage, then allow A phase voltage compare with comparing the middle higher phase of voltage for the first time, determine in three-phase voltage
The highest phase voltage so that both other non-delivery phase voltages higher than deliver phase setting value (being typically set to 5 volts) time can tie up delivery
Phase position, in the present embodiment, makes R3, R6 and R8；R20, R21 and R23；R39, R40 and R41 form bleeder circuit, play throwing
Enter the effect to Preferential Occupancy.D6, D7, D20, D21, D36, D37 form voltage interlock circuit, it is ensured that produce unique preferential
Phase, specifically, the phase comparator outfan that voltage is the highest is+12 volts, and other two phase comparators are output as 0 volt, to guarantee
Produce unique preferential phase.Being up to example with A phase voltage, A phase comparator in-phase end is higher than end of oppisite phase, is output as+12V, output
+ 12 volt voltages by resistance feedback positive voltage signal, promote this phase comparator in-phase end voltage about 5V, with ensure only its
His each phase input terminal voltage could action higher than 5V after this phase voltage.Output+12V voltage signal gives other two end of oppisite phase simultaneously,
Charged to capacitor by resistance, promote its backward end voltage to about 1.3V, pin this two phase comparator and be failure to actuate, preferential phase
After selecting well, d. c. voltage signal is flowed to time delay and delivers module, if now B phase voltage is higher than more than A phase voltage 5V, A phase
Comparator end of oppisite phase voltage will be above the upset of in-phase end voltage comparator, and A phase comparator is output as 0v, then export preferential phase switching
Signal generator module controls the switch control module of this phase and disconnects, and meanwhile, feeds back to B phase comparator, the voltage of C phase comparator is
Zero, then, action before repetition, complete preferentially to determine mutually, whole process to switch control module action completes to need 0.04 second,
This time period ensure that electrical equipment is had no effect generation by handoff procedure, and effect is significantly larger than and mechanically carries out
Select.
And time delay is delivered module and is carried for delay signal；Export preferential phase switching signal generator module for exporting three-phase
Voltage switch signal is also sent to switch control module, as shown in Fig. 2, Fig. 5, this circuit be also by operational amplifier, resistance with
And the electric elements such as diode composition, the purpose of time delay changes (as starting of air conditioner electric current causes to hide short time voltage
Change in short-term) to avoid switch control module sweeping action, and export preferential phase switching signal generator module and be mainly used for passing
Defeated d. c. voltage signal is sent to switch control module, simple for, it is simply that after preferentially determining mutually, only its DC voltage letter
Number could pass through.
It is likely to result in output phase fault in view of the misoperation between IGCT relay, in the present embodiment, arranges
Switch control module misoperation is avoided to cause voltage detecting circuit and output residual voltage locking protection module, the electricity of output phase fault
Pressure testing circuit is made up of the electric elements such as transformer, rectification silicon bridge, and output residual voltage locking protection module is by electric capacity, operation amplifier
The electric elements such as device, resistance form, and obtain return voltage by voltage detecting circuit, through the electrical equipment such as transformer, rectification silicon bridge unit
After part action, flow to export residual voltage locking protection module, and then produce residual voltage detection signal, and it is preferential to be transported to output
Phase switching signaling module, controls switch control module action.
In view of the quality of voltage of user in the case of up to standard, owing to three alternate voltage differences have exceeded 5V, for
Avoid voltage to switch over mutually, be provided with the output HIGH voltage of commutation switching in the case of avoiding user's quality of voltage up to standard
Lock circuit, return voltage is after voltage detecting circuit, high voltage lock circuit, and output high pressure detection signal is to exporting preferential phase
Switching signal generator module, in order to control switch control module.
In the present embodiment, in described modules, the connected mode of electric elements is all carried out by circuit diagram in detail
Description, in the present embodiment, no longer its connected mode is described in detail, and the provided circuit diagram of the present embodiment completes
Those skilled in the art can be made to prepare this device.
The above, be only presently preferred embodiments of the present invention, is not the restriction that the present invention makees other form, appoints
What those skilled in the art changed possibly also with the technology contents of the disclosure above or be modified as equivalent variations etc.
Effect embodiment is applied to other field, but every without departing from technical solution of the present invention content, according to the technical spirit of the present invention
Any simple modification, equivalent variations and the remodeling being made above example, still falls within the protection domain of technical solution of the present invention.
Claims (6)
1. a Zhong Tai district three-phase load and the method for user's terminal voltage balanced adjustment, it is characterised in that include following effective step
Rapid:
A, it is changed to and DC voltage that input ac voltage virtual value is linear by three-phase voltage is sampled
Signal；
B, by three-phase voltage sampling obtained d. c. voltage signal compare, determine the highest phase of voltage；
C, determine voltage Gao Xianghou, by its d. c. voltage signal by after delay circuit, be changed to rear class control machines electricity
Road control signal, and then by controlling controlled silicon conducting and cut-off, so that load switching is to the highest phase of voltage.
The most according to claim 1 district's three-phase load and the method for user's terminal voltage balanced adjustment, it is characterised in that
In described step c, determine voltage Gao Xianghou, utilize bleeder circuit and voltage interlock circuit to guarantee the unidirectional current of the highest phase of voltage
Pressure signal enters delay circuit.
3. a Zhong Tai district three-phase load and the device of user's terminal voltage balanced adjustment, it is characterised in that include and three-phase voltage
It is electrically connected with and for switching the switch control module of three-phase voltage and for controlling the control circuit of switch control module, institute
State voltage sampling module that control circuit includes being electrically connected with successively, preferential delivery selects module, time delay to deliver module and defeated
Going out preferential phase switching signal generator module, wherein, voltage sampling module for being connected sampling and by the electricity of every phase with three-phase voltage
Pressure sampling is changed to the d. c. voltage signal linear with input ac voltage virtual value；Described preferential delivery selects module
For determining the highest phase in three-phase voltage and guaranteeing that only voltage the highest phase d. c. voltage signal is delivered to time delay delivery module；
Described time delay is delivered module and is carried for delay signal；Described output preferential phase switching signal generator module is used for exporting three-phase electricity
Pressure switching signal is also sent to switch control module.
The most according to claim 3 district's three-phase load and the device of user's terminal voltage balanced adjustment, it is characterised in that
Also include for avoiding switch control module misoperation to cause voltage detecting circuit and the output residual voltage locking of output phase fault
Protection module.
The most according to claim 3 district's three-phase load and the device of user's terminal voltage balanced adjustment, it is characterised in that
Also include the output HIGH voltage lock circuit of commutation switching in the case of avoiding user's quality of voltage up to standard.
The most according to claim 3 district's three-phase load and the device of user's terminal voltage balanced adjustment, it is characterised in that
Described switch control module includes and exports the optocoupler that is electrical connected of preferential phase switching signal generator module and electrical with optocoupler
The IGCT relay being connected, described IGCT relay is used for connecting single-phase voltage and electricity consumption end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610736405.0A CN106130048A (en) | 2016-08-26 | 2016-08-26 | Platform district three-phase load and the method for user's terminal voltage balanced adjustment and device thereof |
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| CN201610736405.0A CN106130048A (en) | 2016-08-26 | 2016-08-26 | Platform district three-phase load and the method for user's terminal voltage balanced adjustment and device thereof |
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| CN106684893A (en) * | 2016-12-12 | 2017-05-17 | 国网北京市电力公司 | Three-phase imbalance adjustment control method and control equipment |
| CN107359633A (en) * | 2017-08-21 | 2017-11-17 | 国网山东省电力公司高唐县供电公司 | Switching device is automatically selected based on monolithic processor controlled load |
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| CN111181180A (en) * | 2018-06-07 | 2020-05-19 | 安徽南瑞中天电力电子有限公司 | Multifunctional automatic phase changing system and method for medium and low voltage line |
| CN114094605A (en) * | 2021-11-18 | 2022-02-25 | 广东电网有限责任公司 | Phase modulation device and method for low-voltage meter, electronic equipment and storage medium |
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| CN114094605B (en) * | 2021-11-18 | 2023-08-18 | 广东电网有限责任公司 | Low-voltage meter phase modulation device and method, electronic equipment and storage medium |
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