CN108933444A - Intelligent phase-change switch control circuit - Google Patents
Intelligent phase-change switch control circuit Download PDFInfo
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- CN108933444A CN108933444A CN201710362305.0A CN201710362305A CN108933444A CN 108933444 A CN108933444 A CN 108933444A CN 201710362305 A CN201710362305 A CN 201710362305A CN 108933444 A CN108933444 A CN 108933444A
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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
Abstract
The present invention relates to a kind of circuits, disclose a kind of simple for structure, small in size, low in cost, intelligence phase-change switch control circuit with high accuracy.It includes power module, microprocessor module, electromagnet execution module and the data acquisition module connecting respectively with microprocessor module, memory module, display module, keystroke handling module, opening time detection module, communication module, clock module；Each power supply module in the power module is connected with corresponding module respectively；The microprocessor module is responsible for data processing and the control of other modules；The opening time detection module detection work at present phase separating brake completes the moment and tripping relay is initially powered up the time interval between the moment, and microprocessor module adjusts next time and disconnect the motion compensation time according to this turn-off time interval numerical value；The communication module provides external communication interface and the transmission of responsible data.
Description
Technical field
The present invention relates to a kind of circuits, specifically, being about a kind of intelligent phase-change switch control circuit.
Background technique
Three-phase imbalance refers to three-phase current in the power system（Or voltage）Amplitude is inconsistent, and difference in magnitude is more than regulation
Range.The main reason for causing three-phase imbalance is that three-phase load is unbalanced, belongs to fundamental wave configuration of load problem.Therefore it uses and changes
Mutually switch carries out commutation so that three-phase line load reaches basis equalization, is technological means more commonly used in the prior art.
But structure is complicated for existing phase-change switch general circuit in the market, in separating brake, arc light is larger.
According to GB/T 15543-2008《Power supply quality imbalance of three-phase voltage》Cited non-equilibrium among three phase voltages
Calculation formula：
In formula：--- rotation operator,,,、It is positive respectively
Sequence and negative sequence component；、、--- A phase, B phase and C phase voltage vector.
Summary of the invention
The present invention overcomes deficiencies in the prior art, provide a kind of simple for structure, small in size, low in cost, precision
High intelligent phase-change switch control circuit.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions：Intelligent phase-change switch control
Circuit, including power module, microprocessor module, electromagnet execution module and the number that is connect with microprocessor module respectively
According to acquisition module, memory module, display module, keystroke handling module, opening time detection module, communication module, clock module；
Each power supply module in the power module is connected with corresponding module respectively；
Data acquisition module access interface connection three-phase electricity is registered one's residence the output end of end and current transformer, by inside modules
After calculating, voltage, phase angle, the dead-center position of three-phase electricity are generated, differentiates phase sequence and load current value, and all data are passed
To microprocessor module；
The microprocessor module is responsible for data processing and the control of other modules；
Opening time detection module detection work at present phase separating brake completes the moment and tripping relay be initially powered up the moment it
Between time interval, microprocessor module adjusts next time and disconnects the motion compensation time according to this turn-off time interval numerical value；
The communication module provides external communication interface and the transmission of responsible data.
The intelligence phase-change switch control circuit further includes zero crossing detection module, is examined using the ac power waveform zero point of itself
Dead-center position flag bit is simultaneously transmitted to microprocessor module by brake detection work phase zero crossing position.
The microprocessor module is using STM32 as master controller；Communication module is 485 communication modules.The electromagnetism
Iron execution module includes A, B, C three-phase commutation electromagnet and trip electromagnet.
The microprocessor module indirectly controls metal-oxide-semiconductor conducting by light-coupled isolation device and disconnects, and realizes that electromagnet is held
The on-off of corresponding electromagnet in row module, to reach commutation purpose.
The microprocessor module is mentioned according to the opening time detected in conjunction with the voltage of electromagnet power supply module automatically
The energization moment that is preceding or postponing trip electromagnet, so that the work phase separating brake moment is in extremely short before the zero point of ac power waveform always
In time, to reach arc extinguishing purpose.
The display module includes display screen and indicator light two parts；Display screen show content include three-phase real-time voltage,
Load current, the commutation number of each phase, tripping times；Indicator light is corresponding with each control button, indicates the operation shape of each phase function
State.
The power module includes clock and microprocessor power supply module, electromagnet power supply module, metal-oxide-semiconductor power supply module,
And each power supply module is connect with clock module, microprocessor module, electromagnet execution module, metal-oxide-semiconductor respectively.
The work step of the intelligence phase-change switch control circuit includes：（a）Microprocessor module reads clock module
Time, and judge whether intelligent phase-change switch enters work time zone, continue to read clock module if not entering work time zone
Time continues in next step if into work time zone；（b）Data collecting module collected intelligent switch line inlet port A, B, C three-phase electricity
Pressure, phase angle, phase sequence, load current and other data, and transfer data to microprocessor module；（c）Microprocessor mould
The data that root tuber is come according to data acquisition module transmission calculate the threshold set in non-equilibrium among three phase voltages ε, with intelligent phase-change switch
Value δ compares；Step is repeated if ε≤δ（a）,（b）,（c）；If ε>Then microprocessor module obtains δ according to from data acquisition module
Data and memory module in the historical data that stores, estimate non-equilibrium among three phase voltages ε ' after intelligent phase-change switch commutation；
And be compared with non-equilibrium among three phase voltages ε, step is repeated if ε ' >=ε（a）,（b）,（c）If ε '<ε then microprocessor mould
Block controls electromagnet execution module and carries out corresponding commutation operation, and opening time detection module reads opening time, and sends to
Microprocessor calculates the time that next commutation should compensate；Data after commutation are transmitted to microprocessor mould by data acquisition module
Block, microprocessor module calculate the non-equilibrium among three phase voltages ε of power grid after commutation according to the data after commutationh, bearing power P with
And other power grid related datas, and be stored in memory module, instead of earliest one group of data, repeat step（a）,（b）,
（c）.
Compared with prior art, the beneficial effects of the invention are as follows：Structure of the invention is succinct, small in size, low in cost, precision
Height, the present invention may be implemented to detect and track each phase dead-center position automatically, and microprocessor module control electromagnet execution module exists
The zero crossings of ac power waveform separate sound contact, can reach ideal arc quenching effect, fundamentally solve the separating brake starting the arc
Problem.Has automatic detecting table area low-voltage network three-phase imbalance situation using phase-change switch of the invention, and according to itself
The factors such as bearing power realize automatic commutation function, adjustment threephase load distribution, therefore phase-change switch needs not move through physics networking,
It can establish one's own system.
Detailed description of the invention
Fig. 1 is the control principle block diagram of intelligent phase-change switch control circuit；
Fig. 2 is intelligent switch material object connection figure；
Fig. 3 is the work flow diagram of intelligent phase-change switch control circuit；
Fig. 4 is opening time detection module circuit diagram；
Fig. 5 is zero crossing detection module circuit diagram.
In figure, t：Clock time, Tn：Phase-change switch originates operation time,：The current voltage vector of A phase,：B is suitable
Preceding voltage vector,：The current voltage vector of C phase,′：Voltage vector after A phase commutation,′：Voltage vector after B phase commutation,
′：Voltage vector after C phase commutation, Ix：Phase-change switch present load current, Ix '：Phase-change switch commutation back loading electric current, ε：Currently
Voltage unbalance factor, ε '：Estimate voltage unbalance factor after commutation, εh：Voltage unbalance factor after actual measurement commutation, V1：Current positive sequence
Component, V2：Current negative sequence component, V1 '：Positive-sequence component, V2 ' after commutation：Negative sequence component after commutation, P：Phase-change switch loads function
Rate, δ：Voltage unbalance factor threshold value, γ：The influence coefficient of voltage unbalance factor.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing：As shown in Figures 1 to 5, intelligence
Can phase-change switch control circuit, including power module, microprocessor module, electromagnet execution module and respectively with micro process
The data acquisition module of device module connection, memory module, display module, keystroke handling module, opening time detection module, communication
Module, clock module；
Each power supply module in the power module is connected with corresponding module respectively；
Data acquisition module access interface connection three-phase electricity is registered one's residence the output end of end and current transformer, by inside modules
After calculating, voltage, phase angle, the dead-center position of three-phase electricity are generated, differentiates phase sequence and load current value, and all data are passed
To microprocessor module；
The microprocessor module is responsible for data processing and the control of other modules；
Opening time detection module detection work at present phase separating brake completes the moment and tripping relay be initially powered up the moment it
Between time interval, microprocessor module adjusts next time and disconnects the motion compensation time according to this turn-off time interval numerical value；
The communication module provides external communication interface and the transmission of responsible data.
The intelligence phase-change switch control circuit further includes zero crossing detection module, is examined using the ac power waveform zero point of itself
Dead-center position flag bit is simultaneously transmitted to microprocessor module by brake detection work phase zero crossing position.
The microprocessor module is using STM32 as master controller；Communication module is 485 communication modules.The electromagnetism
Iron execution module includes A, B, C three-phase commutation electromagnet and trip electromagnet.
The microprocessor module indirectly controls metal-oxide-semiconductor conducting by light-coupled isolation device and disconnects, and realizes that electromagnet is held
The on-off of corresponding electromagnet in row module, to reach commutation purpose.
The microprocessor module is mentioned according to the opening time detected in conjunction with the voltage of electromagnet power supply module automatically
The energization moment that is preceding or postponing trip electromagnet, so that the work phase separating brake moment is in always before the zero point of ac power waveform
In very short time, to reach arc extinguishing purpose.
The display module includes display screen and indicator light two parts；Display screen show content include three-phase real-time voltage,
Load current, the commutation number of each phase, tripping times；Indicator light is corresponding with each control button, indicates the operation shape of each phase function
State.
The power module includes clock and microprocessor power supply module, electromagnet power supply module, metal-oxide-semiconductor power supply module,
And each power supply module is connect with clock module, microprocessor module, electromagnet execution module, metal-oxide-semiconductor respectively.
The work step of the intelligence phase-change switch control circuit includes：（a）Microprocessor module reads clock module
Time, and judge whether intelligent phase-change switch enters work time zone, continue to read clock module if not entering work time zone
Time continues in next step if into work time zone；（b）Data collecting module collected intelligent switch line inlet port A, B, C three-phase electricity
Pressure, phase angle, phase sequence, load current and other data, and transfer data to microprocessor module；（c）Microprocessor mould
The data that root tuber is come according to data acquisition module transmission calculate the threshold set in non-equilibrium among three phase voltages ε, with intelligent phase-change switch
Value δ compares；Step is repeated if ε≤δ（a）,（b）,（c）；If ε>Then microprocessor module obtains δ according to from data acquisition module
Data and memory module in the historical data that stores, estimate non-equilibrium among three phase voltages ε ' after intelligent phase-change switch commutation；
And be compared with non-equilibrium among three phase voltages ε, step is repeated if ε ' >=ε（a）,（b）,（c）If ε '<ε then microprocessor mould
Block controls electromagnet execution module and carries out corresponding commutation operation；Opening time detection module reads opening time, and sends to
Microprocessor calculates the time that next commutation should compensate；Data after commutation are transmitted to microprocessor mould by data acquisition module
Block, microprocessor module calculate the non-equilibrium among three phase voltages ε of power grid after commutation according to the data after commutationh, bearing power P with
And other power grid related datas, and be stored in memory module, instead of earliest one group of data, repeat step（a）,（b）,
（c）.
In the present embodiment, non-equilibrium among three phase voltages use after estimating commutation, and wherein P is opened ε '=︱ ε-γ * P ︱ for commutation
Bearing power is closed, γ is the influence coefficient of voltage unbalance factor；γ reflection be non-equilibrium among three phase voltages variable quantity with change
The approximate ratio relationship of phase switching load power variation, calculation formula be γ=（ε-εh）/ P is based on platform area power load here
Rule will be divided into K period, non-equilibrium among three phase voltages ε after commutation three-phase voltage unbalance factor ε, commutation dailyh, change
Phase moment bearing power P is the Y articles of recent history stored in phase-change switch in the K' period, is weighted and averaged
Afterwards, γ value is calculated according to above-mentioned formula, as the basic data for estimating non-equilibrium among three phase voltages ε ' before next commutation, when the
The K' period gathers to obtain one group of new ε, εhAnd P, remove automatically the corresponding K' period gather in earliest one article of record, guarantee the
It is always newest ε, ε that the K' period, which gathers interior Y group record,hWith the value of P；In addition, electricity should be set when using phase-change switch for the first time
Degree of unbalancedness threshold value δ is pressed, and γ initial value should be set according to experimental data.
Heretofore described clock power supply module is AC-DC3.3V power supply module, and electromagnet power supply module is AC-DC220V
Power supply module, microprocessor power supply module are AC-DC3.3V power supply module, metal-oxide-semiconductor power supply module is AC-DC12V power supply module.
In addition, the present invention is additionally provided with arc-suppression circuit module, which is made of ghyristor circuit, and is supplied by AC-DC3.3V
Electric module for power supply.
In the present invention, modules are integrated on one piece of circuit board, can also will be collected after one piece or more of block combiner certainly
At on same circuit board.
The existing phase-change switch in market during the opening process, when dynamic/static contact separates, can generate electric arc, voltage electricity between contact
Stream is bigger, then electric arc is bigger.Alternating current voltage electric current is sine waveform, in the dead-center position of voltage waveform, alternating current electricity
Pressure is reduced to 0V, and current value is also reduced to minimum at this time（It is assumed that power factor is 1）.So selecting the zero point in ac power waveform
Separation sound contact nearby, can achieve ideal arc quenching effect, fundamentally solves separating brake and plays arch problem.Work as open position
When zero crossings in alternating current timing waveform, the arc light that fracture generates is minimum, so microprocessor module is logical in the present invention
Conducting and disconnection that light-coupled isolation device drives metal-oxide-semiconductor indirectly are crossed, realizes electromagnet execution module in the zero point of ac power waveform
Commutation movement is completed in preceding very short time.
For the present invention compared with existing products in markets, circuit structure is succinct, small in size, and low in cost, precision is higher；It can be real
Alternate switching may be implemented to detect and track each phase dead-center position automatically, detect commutation automatically without electric arc under existing bringing onto load state
Time interval, and by calculating analysis to the comprehensive detection of dead-center position detection and commutation time interval, self compensating system misses
Difference realizes intelligent commutation.The product has automatic detecting table area low-voltage network three-phase imbalance situation, and according to own load
The factors such as power and historical data realize automatic commutation function, adjustment threephase load distribution, therefore phase-change switch needs not move through object
Networking is managed, can be established one's own system.
Technical characteristic of the present invention without description can realize that details are not described herein by or using the prior art, certainly,
Above-mentioned specific embodiment is not limitation of the present invention, and the present invention is also not limited to above-mentioned specific embodiment, this skill
The variations, modifications, additions or substitutions that the those of ordinary skill in art field is made within the essential scope of the present invention should also be fallen into
In protection scope of the present invention.
Claims (10)
1. intelligent phase-change switch control circuit, which is characterized in that it includes power module, microprocessor module, electromagnet execution
Module and the data acquisition module being connect respectively with microprocessor module, memory module, display module, keystroke handling module,
Opening time detection module, communication module, clock module；
Each power supply module in the power module is connected with corresponding module respectively；
The microprocessor module is responsible for data processing and the control of other modules；
Opening time detection module detection work at present phase separating brake completes the moment and tripping relay be initially powered up the moment it
Between time interval, microprocessor module adjusts next time and disconnects the motion compensation time according to this turn-off time interval numerical value；
The communication module provides external communication interface and the transmission of responsible data.
2. intelligence phase-change switch control circuit according to claim 1, which is characterized in that it further includes zero passage detection mould
Block detects work phase zero crossing position using the ac power waveform zero point detection function of itself and is transmitted to dead-center position flag bit
Microprocessor module.
3. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the data acquisition module access
Port connection three-phase electricity is registered one's residence the output end of end and current transformer, after inside modules calculate, generate three-phase electricity voltage,
Phase angle, dead-center position differentiate phase sequence and load current value, and all data are transmitted to microprocessor module.
4. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the microprocessor module uses
STM32 is as master controller；Communication module is 485 communication modules.
5. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the electromagnet execution module packet
Include A, B, C three-phase commutation electromagnet and trip electromagnet.
6. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the microprocessor module passes through
Light-coupled isolation device indirectly controls metal-oxide-semiconductor conducting and disconnects, and the on-off of corresponding electromagnet in electromagnet execution module is realized, to reach
To commutation purpose.
7. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the microprocessor module according to
The opening time detected, in conjunction with the voltage of electromagnet power supply module, the automatic energization moment shifted to an earlier date or postpone trip electromagnet,
So that the work phase separating brake moment is in always in the very short time before the zero point of ac power waveform, to reach arc extinguishing purpose.
8. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the display module includes display
Screen and indicator light two parts；Display screen shows that content includes three-phase real-time voltage, load current, the commutation number of each phase, tripping
Number；Indicator light is corresponding with each control button, indicates the operating status of each phase function.
9. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the power module includes clock
With microprocessor power supply module, electromagnet power supply module, metal-oxide-semiconductor power supply module, and each power supply module respectively with clock module, micro-
Processor module, electromagnet execution module, metal-oxide-semiconductor connection.
10. intelligence phase-change switch control circuit according to claim 1, which is characterized in that the intelligence phase-change switch control
The work step of circuit processed includes：（a）Microprocessor module reads the time of clock module, and whether judges intelligent phase-change switch
Into work time zone, continue the time for reading clock module if not entering work time zone, if under continuing into work time zone
One step；（b）Data collecting module collected intelligent switch line inlet port A, B, C three-phase voltage, phase angle, phase sequence, load current and
Other data, and transfer data to microprocessor module；（c）Microprocessor module according to data acquisition module transmission come number
According to calculating non-equilibrium among three phase voltages ε, compared with the threshold value δ set in intelligent phase-change switch；Step is repeated if ε≤δ（a）,
（b）,（c）；If ε>δ then go through according to what is stored out of data acquisition module obtains data and memory module by microprocessor module
History data estimate non-equilibrium among three phase voltages ε ' after intelligent phase-change switch commutation；And compared with non-equilibrium among three phase voltages ε
Compared with, if ε ' >=ε repeat step（a）,（b）,（c）If ε '<Then microprocessor module control electromagnet execution module carries out phase to ε
The commutation operation answered, opening time detection module reads opening time, and sends microprocessor to, and calculating next commutation should mend
The time repaid；Data after commutation are transmitted to microprocessor module by data acquisition module, after microprocessor module is according to commutation
Data calculate the non-equilibrium among three phase voltages ε of power grid after commutationh, bearing power P and other power grid related datas, and deposited
It is stored in memory module, instead of earliest one group of data, repeats step（a）,（b）,（c）.
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| CN110380435A (en) * | 2019-07-10 | 2019-10-25 | 浙江九社电气有限公司 | A kind of high-voltage high-speed phase-change switch |
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| CN112039097A (en) * | 2020-08-28 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Three-phase unbalance visual indication system and method |
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| CN109709480A (en) * | 2019-01-10 | 2019-05-03 | 江苏金智科技股份有限公司 | A kind of relay closed loop of phase-change switch is from check method |
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| CN109950075B (en) * | 2019-03-20 | 2021-07-06 | 中南大学 | Low-voltage distribution network rapid phase commutation method based on magnetic latching relay |
| CN110380435A (en) * | 2019-07-10 | 2019-10-25 | 浙江九社电气有限公司 | A kind of high-voltage high-speed phase-change switch |
| CN110797887A (en) * | 2019-09-23 | 2020-02-14 | 南京软核科技有限公司 | Low-voltage transformer area three-phase unbalance management self-decision control method |
| CN110797887B (en) * | 2019-09-23 | 2023-09-22 | 南京软核科技有限公司 | Low-voltage area three-phase imbalance treatment self-decision control method |
| CN112018789A (en) * | 2020-08-28 | 2020-12-01 | 广东电网有限责任公司广州供电局 | Three-phase unbalanced self-adaptive phase-changing system |
| CN112039097A (en) * | 2020-08-28 | 2020-12-04 | 广东电网有限责任公司广州供电局 | Three-phase unbalance visual indication system and method |
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