CN107086591A - A kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation - Google Patents
A kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation Download PDFInfo
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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
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Abstract
The present invention relates to Power Electronic Technique, specifically related to a kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, including 380V three-phase and four-lines transmission line of electricity and user, in addition to four bridge legs active power filter for three-phase four-wire system, intelligent phase-change switch module and control module；Four bridge legs active power filter for three-phase four-wire system accesses 380V three-phase and four-line transmission lines of electricity with subscriber multiple, intelligent phase-change switch module input is connected with 380V three-phase and four-line transmission lines of electricity, output end is connected with user, and intelligent phase-change switch module is connected by Internet of Things with control module.The three-phase imbalance adjuster supports automatic detection when for Operation of Electric Systems, saves substantial amounts of manpower and materials, improves the security of equipment and the reliability of power supply.
Description
Technical field
The invention belongs to electric and electronic technical field, more particularly to a kind of three-phase based on reactive-load compensation and intelligent commutation is not
Balance regulator.
Background technology
Electric energy is as the most popular energy in modern society, and its quality of power supply is to weigh a national development level
One of important symbol.Due to developing rapidly for Power Electronic Technique, power electronic equipment is widely used in a variety of applications.With office
Automation and household electrical appliance become increasingly popular, occur in that substantial amounts of single-phase non-linear customer in three-phase four-wire system, such as count
Calculation machine, printer, fluorescent lamp, convertible frequency air-conditioner, elevator, television set, washing machine, refrigerator etc., when all showing larger electricity consumption
Empty characteristic discreteness, therefore the long-term objective reality of low-voltage network three-phase load unbalance problem.With the single-phase new energy of 220V
Access, distribution network load imbalance problem will protrude more.
Current commonly used technology is to increase reactive power compensator in user terminal and circuit.But when system three-phase is uneven
Weighing apparatus degree is larger, serious three-phase imbalance occurs, and reactive-load compensation can not reach requirement, then needs to carry out load commutation, draw optimal
Intelligent switch module is controlled by carrier-wave transmission after algorithm and order is sent, commutation is carried out.
The content of the invention
It can automatically select and be used in the case of system tri-phase unbalance factor is less it is an object of the invention to provide one kind
Active filter carries out reactive-load compensation, and is adjusted when serious three-phase imbalance occurs in system using the three-phase imbalance of load commutation
Save device and utilize the three-phase imbalance adjuster regulation unbalanced method of distribution network load.
To achieve the above object, the technical solution adopted by the present invention is：It is a kind of based on reactive-load compensation and intelligent commutation three
Mutually uneven adjuster, including 380V three-phase and four-lines transmission line of electricity and user, in addition to four bridge legs three-phase four-wire system active electric power
Wave filter, intelligent phase-change switch module and control module；Four bridge legs active power filter for three-phase four-wire system connects with subscriber multiple
Enter 380V three-phase and four-line transmission lines of electricity, intelligent phase-change switch module input is connected with 380V three-phase and four-line transmission lines of electricity, export
End is connected with user, and intelligent phase-change switch module is connected by Internet of Things with control module.
In the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, four bridge legs three-phase and four-line is formed with
Active power filter uses four bridge legs Voltage type converter, includes parallel three phase rectifying bridge type circuit and filtering impedance；Three-phase is simultaneously
Connection rectifying bridge type circuit is connected with filtering impedance, and is connected with 380V three-phase and four-line transmission lines of electricity.
In the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, filtering impedance includes filtered electrical
Feel L1, L2, L3With exchanging reactance equivalent resistance R1, R2, R3；Each bridge arm of parallel three phase rectifying bridge type circuit includes two insulation
Grid bipolar transistor IGBT block coupled in series, each module includes a diode and an insulated gate bipolar transistor IGBT
Parallel connection, DC side includes two electric capacity C1With C2Parallel connection, the midpoint of equalizing capacitance meets 380V three-phase and four-line transmission line of electricity zero line N, and
It is connected with each bridge arm midpoint, and neutral-point-clamped circuit is connected to form with filtering impedance.
In the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, intelligent phase-change switch module bag
Unit containing electronic power switch, intelligent phase selection switch controller, carrier module；Electronic power switch unit passes through A, B, C three-phase
Primary cable is connected with 380V three-phase and four-line transmission lines of electricity, and passes through A, B, C three-phase low-voltage wire and intelligent phase-selection switch control
Device processed is connected, and intelligent phase selection switch controller is connected by RS485 interfaces with carrier module, carrier module and control module base
In GPRS communications.
In the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, control module is adopted including data
Collect module, harmonic detecting module and computing unit；Data acquisition module gathers three-phase current data using current transformer.
In the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, filtering impedance parameter is chosen public
Formula is：
In formula, VdcFor DC bus-bar voltage, fsFor switching frequency, VmFor circuit output voltage amplitude, ImFor circuit output electricity
Flow amplitude, Δ imaxThe maximum fluctuated for ac-side current, ω is supply voltage angular frequency；
The selection formula of DC bus capacitor is：
In formula, PdcActive power, Δ V are consumed for DC sidedcmaxThe maximum fluctuated for DC voltage.
In the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, in four bridge legs three-phase four-wire system
The Voltage loop of Active Power Filter-APF introduces trapper, and its parameter is:
ω in formulacFor resonant frequency, value is relevant with the frequency fluctuation of second harmonic, fluctuates bigger, and value is bigger；
PR adjusters, o axle PR controller transfer functions are separately designed to o axles and d-q axles：
The PR controller transfer functions of d-q axles：
In formula, kpFor ratio term coefficient, kiFor resonance term coefficient.
Present invention also offers a kind of adjusting method of the three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation,
Comprise the following steps：When three-phase current unbalance degree reaches certain threshold value, three-phase electricity fluxion is gathered by current transformer
According to calculating three-phase current unbalance degree, so as to judge whether to user's commutation；If current three-phase degree of unbalancedness is smaller, open
Dynamic four bridge legs active power filter for three-phase four-wire system carries out reactive-load compensation；Zero sequence degree of unbalancedness is reduced using zero-sequence network, will
User power factor is compensated to 0.9；If current three-phase degree of unbalancedness is very big, user's commutation is carried out.
In the adjusting method of the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, if three-phase electricity
Flow degree of unbalancedness and be less than 10%, then start four bridge legs active power filter for three-phase four-wire system and carry out reactive-load compensation；If three-phase electricity
Flow degree of unbalancedness and be more than 10%, then carry out user's commutation.
In the adjusting method of the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, four bridge legs three
The specific steps that phase four-wire system Active Power Filter-APF carries out reactive-load compensation include：Harmonic detecting module carries out user terminal first
Input current is monitored, and carries out internal DSP calculating, obtains the harmonic wave and reactive component of current flow；Then sent out by pwm signal
Four bridge legs active power filter for three-phase four-wire system is given, one and user's harmonic wave electric current equal in magnitude, in opposite direction is produced
Compensation harmonic electric current in power network is injected into, zero sequence degree of unbalancedness is reduced using zero-sequence network, user power factor compensation is arrived
0.9, eliminate degree of unbalancedness.
In the adjusting method of the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, user's commutation
Specific steps include：
Step 1, initialize first, three-phase current unbalance degree detection time interval T and three-phase current unbalance degree are set
Unit timing statisticses t0；
Step 2, put three-phase current unbalance degree detection timer t1Initial value is 0, and three-phase current unbalance degree transfinites secondary
Counter t2Initial value is 0；
Step 3, by data collecting module collected three-phase current data, and pass through computing unit to calculate three-phase current uneven
Weighing apparatus degree；
Step 4, judge whether three-phase current unbalance degree is exceeded；If not exceeded, step 5 is performed；If exceeded, by three-phase
Current unbalance factor transfinites number counter t2Increase by 1 simultaneously performs step 6；
Step 5, compare three-phase current unbalance degree detection timer t1With three-phase current unbalance degree unit timing statisticses
t0If, t1>t0, step 2 is performed, if t1<t0, then be delayed T execution steps 3；
Step 6, judge that three-phase current unbalance degree transfinites number counter t2Value it is whether exceeded；If not exceeded, perform
Step 5；If exceeded, step 7 is performed；
Step 7, to pass through data collecting module collected distribution low-voltage side three-phase current, the electric current of each user's branch road, phase sequence real
When data, and input to computing unit；
Step 8, the optimal commutation control command for obtaining by genetic algorithm each low-voltage customer；
Step 9, the optimal commutation order for obtaining computing unit are transferred to carrier module by GPRS communications, then are transferred to
Phase selection on-off controller unit；
Step 10, by intelligent phase selection switch controller carry out data processing, commutation is sent to electronic power switch unit
Order.
In the adjusting method of the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, zero-sequence network
The calculation formula of compensating parameter is as follows：If capacitive reactive power is just, inductive reactive power is negative；
In formula,The reactive capability accordingly compensated for a in zero sequence compensation network,Accordingly mended for b in zero sequence compensation network
The reactive capability repaid,The reactive capability accordingly compensated for c in zero sequence compensation network；Represent ab phases in negative sequence compensation network
Between the reactive capability that should compensate；Represent the alternate reactive capabilities that should be compensated of bc in negative sequence compensation network；Represent that negative phase-sequence is mended
Repay the alternate reactive capabilities that should be compensated of ca in network；Having for a, b, c three phase unbalance current generation is represented respectively
Work(power；The reactive power that a, b, c three phase unbalance current are produced is represented respectively.
In the adjusting method of the above-mentioned three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, step 8 is lost
Propagation algorithm implement including, according to vector basis because coding strategy carry out chromosome coding, produce initial population, calculate population
In each individual fitness function, constantly carry out selection optimization, under the requirement for reaching iterations, obtain each low-voltage customer
Optimal commutation control command.
The beneficial effects of the invention are as follows：Automatic detection is supported when for Operation of Electric Systems, substantial amounts of manpower thing is saved
Power, improves the security of equipment and the reliability of power supply.
Brief description of the drawings
Fig. 1 is three-phase imbalance controller structure signal of the one embodiment of the invention based on reactive-load compensation and intelligent commutation
Figure；
Fig. 2 is the circuit diagram of one embodiment of the invention four bridge legs active power filter for three-phase four-wire system；
Fig. 3 is the intelligent phase-change switch module circuit diagram of one embodiment of the invention；
Fig. 4-1, the workflow diagram that 4-2,4-3 are one embodiment of the invention.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
The example of the embodiment is shown in the drawings, wherein same or similar label represents identical or class from beginning to end
As element or the element with same or like function.The embodiments described below with reference to the accompanying drawings are exemplary, only
For explaining the present invention, and it is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the part and setting of specific examples are described.They are only merely illustrative, and purpose is not
It is to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.This repetition be for
Simplify and clear purpose, the relation between discussed various embodiments and/or setting itself is not indicated.In addition, this hair
The bright example for providing various specific techniques and material, but those of ordinary skill in the art can be appreciated that other techniques
The use of applicability and/or other materials.In addition, fisrt feature described below second feature it " on " structure can be with
The embodiment for being formed as directly contacting including the first and second features, can also include other feature formation first and second
Embodiment between feature, such first and second feature may not be direct contact.
, it is necessary to explanation in description of the invention, unless otherwise prescribed and limit, term " connected " " connection " should do extensively
Reason and good sense solution, can be joined directly together for example, it may be mechanically connecting or electrical connection or the connection of two element internals,
It can also be indirectly connected to, for those of ordinary skill in the related art, can managed as the case may be by intermediary
Solve the concrete meaning of above-mentioned term.
The present embodiment adopts the following technical scheme that to realize, a kind of three-phase imbalance based on reactive-load compensation and intelligent commutation
Adjuster, including 380V three-phase and four-lines transmission line of electricity and user, in addition to four bridge legs active power filter for three-phase four-wire system, intelligence
Can phase-change switch module and control module；Four bridge legs active power filter for three-phase four-wire system accesses 380V three-phases with subscriber multiple
Four line transmission lines of electricity, intelligent phase-change switch module input is connected with 380V three-phase and four-line transmission lines of electricity, and output end connects with user
Connect, intelligent phase-change switch module is connected by Internet of Things with control module.
Further, four bridge legs active power filter for three-phase four-wire system uses four bridge legs Voltage type converter, includes three-phase
Rectifying bridge type circuit and filtering impedance in parallel；Parallel three phase rectifying bridge type circuit is connected with filtering impedance, and with 380V three-phases four
Line transmission line of electricity is connected.
Further, filtering impedance includes filter inductance L1, L2, L3With exchanging reactance equivalent resistance R1, R2, R3；Parallel three phase
Each bridge arm of rectifying bridge type circuit includes two insulated gate bipolar transistor IGBT block coupled in series, and each module includes one
Diode and an insulated gate bipolar transistor IGBT parallel connection, DC side include two electric capacity C1With C2Parallel connection, equalizing capacitance
Midpoint meets 380V three-phase and four-line transmission line of electricity zero line N, and is connected with each bridge arm midpoint, and is connected to form midpoint pincers with filtering impedance
Position circuit.
Further, intelligent phase-change switch module includes electronic power switch unit, intelligent phase selection switch controller, carrier wave mould
Block；Electronic power switch unit is connected by A, B, C three-phase low-voltage wire with 380V three-phase and four-line transmission lines of electricity, and by A,
B, C three-phase low-voltage wire are connected with intelligent phase selection switch controller, and intelligent phase selection switch controller is by RS485 interfaces with carrying
Ripple module is connected, and carrier module is communicated with control module based on GPRS.
Further, control module includes data acquisition module, harmonic detecting module and computing unit；Data acquisition module profit
Current Transformer gathers three-phase current data.
Further, filtering impedance parameter selection formula is：
In formula, VdcFor DC bus-bar voltage, fsFor switching frequency, VmFor circuit output voltage amplitude, ImFor circuit output electricity
Flow amplitude, Δ imaxThe maximum fluctuated for ac-side current, ω is supply voltage angular frequency；
The selection formula of DC bus capacitor is：
In formula, PdcActive power, Δ V are consumed for DC sidedcmaxThe maximum fluctuated for DC voltage.
Further, trapper is introduced in the Voltage loop of four bridge legs active power filter for three-phase four-wire system, its parameter is:
ω in formulacFor resonant frequency, value is relevant with the frequency fluctuation of second harmonic, fluctuates bigger, and value is bigger；
PR adjusters, o axle PR controller transfer functions are separately designed to o axles and d-q axles：
The PR controller transfer functions of d-q axles：
In formula, kpFor ratio term coefficient, kiFor resonance term coefficient.
A kind of adjusting method of the three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, comprises the following steps：
When three-phase current unbalance degree reaches certain threshold value, three-phase current data are gathered by current transformer, three-phase electricity is calculated
Degree of unbalancedness is flowed, so as to judge whether to user's commutation；If current three-phase degree of unbalancedness is smaller, start four bridge legs three-phase four
Line is formed with active power filter and carries out reactive-load compensation；Zero sequence degree of unbalancedness is reduced using zero-sequence network, user power factor is mended
Repay to 0.9；If current three-phase degree of unbalancedness is very big, user's commutation is carried out.
Further, if three-phase current unbalance degree is less than 10%, four bridge legs three-phase four-wire system active power filtering is started
Device carries out reactive-load compensation；If three-phase current unbalance degree is more than 10%, user's commutation is carried out.
Further, the specific steps of four bridge legs active power filter for three-phase four-wire system progress reactive-load compensation include：First
Harmonic detecting module carries out the input current monitoring of user terminal, and carries out internal DSP calculating, obtains the harmonic wave and nothing of current flow
Work(component；Then four bridge legs active power filter for three-phase four-wire system is sent to by pwm signal, produces one and user's harmonic wave
Electric current equal in magnitude, in opposite direction is injected into compensation harmonic electric current in power network, and zero sequence degree of unbalancedness is reduced using zero-sequence network,
By user power factor compensation to 0.9, degree of unbalancedness is eliminated.
Further, user's commutation specific steps include：
Step 1, initialize first, three-phase current unbalance degree detection time interval T and three-phase current unbalance degree are set
Unit timing statisticses t0；
Step 2, put three-phase current unbalance degree detection timer t1Initial value is 0, and three-phase current unbalance degree transfinites secondary
Counter t2Initial value is 0；
Step 3, by data collecting module collected three-phase current data, and pass through computing unit to calculate three-phase current uneven
Weighing apparatus degree；
Step 4, judge whether three-phase current unbalance degree is exceeded；If not exceeded, step 5 is performed；If exceeded, by three-phase
Current unbalance factor transfinites number counter t2Increase by 1 simultaneously performs step 6；
Step 5, compare three-phase current unbalance degree detection timer t1With three-phase current unbalance degree unit timing statisticses
t0If, t1>t0, step 2 is performed, if t1<t0, then be delayed T execution steps 3；
Step 6, judge that three-phase current unbalance degree transfinites number counter t2Value it is whether exceeded；If not exceeded, perform
Step 5；If exceeded, step 7 is performed；
Step 7, to pass through data collecting module collected distribution low-voltage side three-phase current, the electric current of each user's branch road, phase sequence real
When data, and input to computing unit；
Step 8, the optimal commutation control command for obtaining by genetic algorithm each low-voltage customer；
Step 9, the optimal commutation order for obtaining computing unit are transferred to carrier module by GPRS communications, then are transferred to
Phase selection on-off controller unit；
Step 10, by intelligent phase selection switch controller carry out data processing, commutation is sent to electronic power switch unit
Order.
Further, the calculation formula of zero-sequence network compensating parameter is as follows：If capacitive reactive power is just, inductive reactive power is negative；
In formula,The reactive capability accordingly compensated for a in zero sequence compensation network,Accordingly mended for b in zero sequence compensation network
The reactive capability repaid,The reactive capability accordingly compensated for c in zero sequence compensation network；Represent ab phases in negative sequence compensation network
Between the reactive capability that should compensate；Represent the alternate reactive capabilities that should be compensated of bc in negative sequence compensation network；Represent that negative phase-sequence is mended
Repay the alternate reactive capabilities that should be compensated of ca in network；Having for a, b, c three phase unbalance current generation is represented respectively
Work(power；The reactive power that a, b, c three phase unbalance current are produced is represented respectively.
Further, step 8 genetic algorithm implement including, according to vector basis because coding strategy carry out chromosome volume
Code, produces initial population, calculates the fitness function of each individual in population, constantly carries out selection optimization, is reaching iteration time
Under several requirements, the optimal commutation control command of each low-voltage customer is obtained.
When it is implemented, as shown in figure 1, a kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, bag
Include four bridge legs active power filter for three-phase four-wire system, intelligent phase-change switch module and control module；Four bridge legs three-phase four-wire system
Active Power Filter-APF is parallel to 380V three-phase and four-line transmission lines of electricity；Intelligent phase-change switch module is equally parallel to 380V three-phases four
Line transmission line of electricity；The three-phase current input of intelligent phase-change switch module is connected with 380V three-phase and four-line transmission lines of electricity；Intelligence
Phase-change switch module is connected by Internet of Things with control module；The three-phase current output end of intelligent phase-change switch module and user's phase
Connection.
Spend moreover, control module monitoring is load unbalanced and send phase selection switching command, with being connected to three-phase low-voltage wire
Intelligent phase-change switch module carry out information interchange, judge whether phase changer works.
Moreover, four bridge legs active power filter for three-phase four-wire system uses four bridge legs Voltage type converter, parallel connection access electricity
Net, is worked in controlled current source mode.Control module gathers three-phase current data according to the current transformer of data acquisition module,
The tri-phase unbalance factor of computing system, can look first at carry out idle mend by four bridge legs active power filter for three-phase four-wire system
Repay and be transferred to more than 0.9 to eliminate degree of unbalancedness by power factor, if can be so that commutation operation need not be carried out；If can not, then enter
Row user's commutation.The three-phase imbalance adjuster of the present embodiment be reactive-load compensation be unable to reach require when, can carry out automatic
The device of commutation.
As shown in Fig. 2 four bridge legs active power filter for three-phase four-wire system includes parallel three phase rectifying bridge type circuit Y and filter
Wave impedance Z；Parallel three phase rectifying bridge type circuit is in series with filtering impedance, and commonly through A, B, C three-phase low-voltage wire with
380V three-phase and four-line transmission lines of electricity are connected.Filtering impedance Z includes filter inductance L1, L2, L3With exchanging reactance equivalent resistance R1,
R2, R3；Each bridge arm has two insulated gate bipolar transistor IGBT block coupled in series compositions in parallel three phase rectifying bridge type circuit Y,
Each module is made up of a diode and an insulated gate bipolar transistor IGBT parallel connection, and DC side is by two electric capacity C1With
C2Parallel connection is constituted, and the midpoint of equalizing capacitance is zero line N, and midpoint is connected with each bridge arm midpoint, and is connected with filtering impedance Z in composition
Point clamp circuit.
As shown in figure 3, intelligent phase-change switch module includes electronic power switch unit, intelligent phase selection switch controller, load
Ripple module.Electronic power switch unit is connected by A, B, C three-phase low-voltage wire with 380V three-phase and four-line transmission lines of electricity, and together
Sample is connected by A, B, C three-phase low-voltage wire with intelligent phase selection switch controller, sees M in Fig. 3；Each electronic power switch bag
Include on-off circuit P1、P2Two parts；Intelligent phase selection switch controller is connected with carrier module simultaneously, according to the commutation order of receiving
The switch of user is controlled；Carrier module carries out N in the communication based on GPRS, such as Fig. 3 with control module；Exchange phase command
And commutation mode enters the exchange of row information.
User's commutation that control module is applied to, the mathematical modeling of genetic algorithm is set up according to the degree of unbalancedness of load, is obtained
Go out optimal commutation mode and carrier module is passed to by GPRS, then intelligent phase-selection switch control is transferred to by RS485 interfaces
Device carries out phase-change switch action.
Concrete operating principle is as follows：When the three-phase current unbalance degree of distribution box reaches certain threshold value, control module
Three-phase current data are gathered according to the current transformer of data acquisition module, and proceed by analysis and are calculated；If system three-phase electricity
Flow degree of unbalancedness smaller, serious three-phase current unbalance do not occur, then start four bridge legs three-phase four-wire system active power filtering
Device carries out reactive-load compensation：Harmonic detecting module first in control module carries out the input current monitoring of user terminal, and carries out interior
Portion DSP is calculated, and obtains the harmonic wave and reactive component of current flow；Then internal four bridge legs three-phase four is sent to by pwm signal
Line is formed with active power filter, controls the inverter to produce one and the electric current injection equal in magnitude, in opposite direction of user's harmonic wave
The compensation harmonic electric current into power network, zero sequence degree of unbalancedness is reduced using zero-sequence network, by user power factor compensation to 0.9, with
The requirement of reactive-load compensation is met, degree of unbalancedness is eliminated；If system tri-phase unbalance factor is very big, user's commutation is carried out.
The workflow of the present embodiment as shown in Fig. 4-1, Fig. 4-2, Fig. 4-3,
The first step, beginning, whether power-on self-test is surveyed malfunctions, if carrying out second step, controller locking if not, record
Failure.
Second step, initialization, set three-phase current unbalance degree detection time interval T, three-phase current unbalance degree unit
Timing statisticses t0Value.
3rd step, put three-phase current unbalance detection timer t1Initial value be 0, putting three-phase current unbalance degree transfinites
Number counter t2Value be 0.
4th step, start three-phase current unbalance degree and transfinite number counter t2。
5th step, reading distribution low-voltage side return back out the three-phase current real time data of line, generate three-phase current unbalance degree
Index.
6th step, judge whether this returns back out line end mouthful three-phase current unbalance degree exceeded, if performing the 7th step, if
The 9th step of no execution.
7th step, three-phase current unbalance degree transfinite number counter t2Value increase by 1.
8th step, judge that three-phase current unbalance degree transfinites number counter t2Value it is whether exceeded；If performing the
Ten steps；The 9th step is performed if not.
9th step, judge three-phase current unbalance degree detection timer t1Value whether be more than t0If, t1>t0, perform the 3rd
Step, if t1<t0, then be delayed T the 5th steps of execution.
Tenth step, collection power distribution voltage side three-phase current, the electric current of each user's branch road, phase sequence real time data.
11st step, whether three-phase current unbalance degree is judged more than 10%, if performing the 13rd step；Hold if not
The step of row the 12nd.
12nd step, using four bridge legs active power filter for three-phase four-wire system carry out reactive-load compensation, reach power factor
To more than 0.9, perform to the 20th step.
13rd step, the electric current of input collection, phase sequence data, set iterations A=0.
14th step, according to minigene coding strategy carry out chromosome coding, produce initial population, calculate population it is each
The fitness function of individual.
15th step, computing, judgement, selection parents' Shuangzi single-point vector basis are carried out with fitness function to population handed over because overall
Fork；Outstanding gene is replicated, and gene makes a variation between [100] [010] [001] three gene vectors, generation population of new generation.
16th step, judge whether to reach iterations, if performing the 17th step；A=A+1 is put if not performs the
15 steps.
17th step, obtain the optimal commutation control instruction of each low-voltage customer.
18th step, judging the 1st ..., whether i-th ... n-th commutation device needs commutation to operate, if performing the
19 steps, if otherwise performing the 12nd step.
19th step, the optimal commutation control instruction of transmission are to the 1st ..., and i-th ... n-th automatic commutation device completes behaviour
Make, perform the 20th step.
20th step, harmonic carcellation, terminate.
The respective algorithms used in the present embodiment workflow are as follows：
First, zero sequence compensation network parameter is calculated
The degree of unbalancedness of three-phase current is calculated, when degree of unbalancedness is 2%~5%, is carried out by the way of reactive-load compensation
The regulation of degree of unbalancedness.It can be obtained by deriving, the power form under capacity optimal conditions is as follows：(formula using capacitive reactive power as just,
Inductive reactive power is negative)
In formula,For in zero sequence compensation network, the reactive capability that a is accordingly compensated；For in zero sequence compensation network, b is corresponding
The reactive capability of compensation；For in zero sequence compensation network, the reactive capability that c is accordingly compensated.Represent in negative sequence compensation network,
The alternate reactive capabilities that should be compensated of ab；Represent in negative sequence compensation network, the alternate reactive capabilities that should be compensated of bc；Represent
In negative sequence compensation network, the alternate reactive capabilities that should be compensated of ca. The production of a, b, c three phase unbalance current is represented respectively
Raw active power.The reactive power that a, b, c three phase unbalance current are produced is represented respectively.By above formula,
Zero sequence compensation network parameter can be calculated.
2nd, the parameter of four bridge legs active power filter for three-phase four-wire system is chosen
The selection of filter reactor：
Wherein, VdcFor DC bus-bar voltage, fsFor switching frequency, VmFor circuit output voltage amplitude, ImFor circuit output electricity
Flow amplitude, ΔimaxThe maximum fluctuated for ac-side current, ω is supply voltage angular frequency.
The selection of DC bus capacitor：
Wherein, PdcActive power, Δ V are consumed for DC sidedcmaxThe maximum fluctuated for DC voltage.
3rd, without Harmonic detection
Three-phase dqo rotating coordinate transformations must be used in order to suppress neutral line current caused by uneven user.
Wherein, the purpose of neutral line current is suppressed due to reach, then four bridge legs active power filter for three-phase four-wire system electricity
Larger zero-sequence current can be flowed through by holding midpoint, and this can cause four bridge legs active power filter for three-phase four-wire system DC voltage to produce
Raw larger second harmonic, influences filter effect.Trapper is introduced in Voltage loop, direct-current secondary harmonic wave is mainly filtered out.It is designed
Trapper be:
ω in formulacFor resonant frequency, its value is relevant with the frequency fluctuation of second harmonic, fluctuates bigger, and value is bigger.
According to the particularity of four bridge legs active power filter for three-phase four-wire system, it is necessary to separately design PR to d-q axles and o axles
Adjuster.
O axle PR controller transfer functions：
The PR controller transfer functions of d-q axles are：
Wherein, kpFor ratio term coefficient, kiFor resonance term coefficient.
It should be appreciated that the part that this specification is not elaborated belongs to prior art.
Although describing the embodiment of the present invention above in association with accompanying drawing, those of ordinary skill in the art should
Understand, these are merely illustrative of, and various deformation or modification can be made to these embodiments, without departing from the original of the present invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (13)
1. a kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, including 380V three-phase and four-lines transmission line of electricity and
User, it is characterized in that, in addition to four bridge legs active power filter for three-phase four-wire system, intelligent phase-change switch module and control mould
Block；Four bridge legs active power filter for three-phase four-wire system accesses 380V three-phase and four-line transmission lines of electricity, intelligent commutation with subscriber multiple
Switch module input is connected with 380V three-phase and four-line transmission lines of electricity, and output end is connected with user, and intelligent phase-change switch module is led to
Internet of Things is crossed to be connected with control module.
2. the three-phase imbalance adjuster as claimed in claim 1 based on reactive-load compensation and intelligent commutation, it is characterized in that, four bridges
Arm active power filter for three-phase four-wire system uses four bridge legs Voltage type converter, includes parallel three phase rectifying bridge type circuit and filter
Wave impedance；Parallel three phase rectifying bridge type circuit is connected with filtering impedance, and is connected with 380V three-phase and four-line transmission lines of electricity.
3. the three-phase imbalance adjuster as claimed in claim 2 based on reactive-load compensation and intelligent commutation, it is characterized in that, filtering
Impedance includes filter inductance L1, L2, L3With exchanging reactance equivalent resistance R1, R2, R3；Each bridge of parallel three phase rectifying bridge type circuit
Arm includes two insulated gate bipolar transistor IGBT block coupled in series, and each module includes a diode and an insulated gate is double
Bipolar transistor IGBT is in parallel, and DC side includes two electric capacity C1With C2Parallel connection, it is defeated that the midpoint of equalizing capacitance connects 380V three-phase and four-lines
Electric line zero line N, and be connected with each bridge arm midpoint, and it is connected to form neutral-point-clamped circuit with filtering impedance.
4. the three-phase imbalance adjuster as claimed in claim 1 based on reactive-load compensation and intelligent commutation, it is characterized in that, intelligence
Phase-change switch module includes electronic power switch unit, intelligent phase selection switch controller, carrier module；Electronic power switch unit
It is connected by A, B, C three-phase low-voltage wire with 380V three-phase and four-line transmission lines of electricity, and passes through A, B, C three-phase low-voltage wire and intelligence
Energy phase selection on-off controller is connected, and intelligent phase selection switch controller is connected by RS485 interfaces with carrier module, carrier module
Communicated with control module based on GPRS.
5. the three-phase imbalance adjuster as claimed in claim 1 based on reactive-load compensation and intelligent commutation, it is characterized in that, control
Module includes data acquisition module, harmonic detecting module and computing unit；Data acquisition module utilizes current transformer collection three
Phase current data.
6. the three-phase imbalance adjuster as claimed in claim 3 based on reactive-load compensation and intelligent commutation, it is characterized in that, filtering
Impedance parameter chooses formula：
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In formula, VdcFor DC bus-bar voltage, fsFor switching frequency, VmFor circuit output voltage amplitude, ImFor circuit output current width
Value, Δ imaxThe maximum fluctuated for ac-side current, ω is supply voltage angular frequency；
The selection formula of DC bus capacitor is：
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In formula, PdcActive power, Δ V are consumed for DC sidedcmaxThe maximum fluctuated for DC voltage.
7. the three-phase imbalance adjuster as claimed in claim 2 based on reactive-load compensation and intelligent commutation, it is characterized in that, four
The Voltage loop of bridge arm active power filter for three-phase four-wire system introduces trapper, and its parameter is:
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ω in formulacFor resonant frequency, value is relevant with the frequency fluctuation of second harmonic, fluctuates bigger, and value is bigger；
PR adjusters, o axle PR controller transfer functions are separately designed to o axles and d-q axles：
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The PR controller transfer functions of d-q axles：
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In formula, kpFor ratio term coefficient, kiFor resonance term coefficient.
8. a kind of adjusting method of the three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation, it is characterized in that, including with
Lower step：When three-phase current unbalance degree reaches certain threshold value, three-phase current data are gathered by current transformer, calculated
Three-phase current unbalance degree, so as to judge whether to user's commutation；If current three-phase degree of unbalancedness is smaller, start four bridge legs
Active power filter for three-phase four-wire system carries out reactive-load compensation；Zero sequence degree of unbalancedness is reduced using zero-sequence network, by user power
Factor compensation is to 0.9；If current three-phase degree of unbalancedness is very big, user's commutation is carried out.
9. the adjusting method of the three-phase imbalance adjuster as claimed in claim 8 based on reactive-load compensation and intelligent commutation, its
It is characterized in, if three-phase current unbalance degree is less than 10%, to start four bridge legs active power filter for three-phase four-wire system and carry out nothing
Work(is compensated；If three-phase current unbalance degree is more than 10%, user's commutation is carried out.
10. the adjusting method of the three-phase imbalance adjuster as claimed in claim 9 based on reactive-load compensation and intelligent commutation, its
It is characterized in that the specific steps that four bridge legs active power filter for three-phase four-wire system carries out reactive-load compensation include：Harmonic detecting first
Module carries out the input current monitoring of user terminal, and carries out internal DSP calculating, obtains the harmonic wave and reactive component of current flow；
Then four bridge legs active power filter for three-phase four-wire system is sent to by pwm signal, produces one and user's harmonic wave size phase
Compensation harmonic electric current in power network is injected into Deng, electric current in opposite direction, zero sequence degree of unbalancedness is reduced using zero-sequence network, by user
Power factor compensation eliminates degree of unbalancedness to 0.9.
11. the adjusting method of the three-phase imbalance adjuster as claimed in claim 9 based on reactive-load compensation and intelligent commutation, its
It is characterized in that user's commutation specific steps include：
Step 1, initialize first, three-phase current unbalance degree detection time interval T and three-phase current unbalance degree unit are set
Timing statisticses t0；
Step 2, put three-phase current unbalance degree detection timer t1Initial value is 0, and three-phase current unbalance degree transfinites counting how many times
Device t2Initial value is 0；
Step 3, by data collecting module collected three-phase current data, and three-phase current unbalance is calculated by computing unit
Degree；
Step 4, judge whether three-phase current unbalance degree is exceeded；If not exceeded, step 5 is performed；If exceeded, by three-phase current
Degree of unbalancedness transfinites number counter t2Increase by 1 simultaneously performs step 6；
Step 5, compare three-phase current unbalance degree detection timer t1With three-phase current unbalance degree unit timing statisticses t0If,
t1>t0, step 2 is performed, if t1<t0, then be delayed T execution steps 3；
Step 6, judge that three-phase current unbalance degree transfinites number counter t2Value it is whether exceeded；If not exceeded, step 5 is performed；
If exceeded, step 7 is performed；
Step 7, counted in real time by data collecting module collected distribution low-voltage side three-phase current, the electric current of each user's branch road, phase sequence
According to, and input to computing unit；
Step 8, the optimal commutation control command for obtaining by genetic algorithm each low-voltage customer；
Step 9, the optimal commutation order for obtaining computing unit are transferred to carrier module by GPRS communications, then are transferred to phase selection
Switch controller unit；
Step 10, by intelligent phase selection switch controller carry out data processing, commutation order is sent to electronic power switch unit.
12. the adjusting method of the three-phase imbalance adjuster as claimed in claim 8 based on reactive-load compensation and intelligent commutation, its
It is characterized in that the calculation formula of zero-sequence network compensating parameter is as follows：If capacitive reactive power is just, inductive reactive power is negative；
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In formula,The reactive capability accordingly compensated for a in zero sequence compensation network,Accordingly compensated for b in zero sequence compensation network
Reactive capability,The reactive capability accordingly compensated for c in zero sequence compensation network；Ab is alternate in expression negative sequence compensation network should
The reactive capability of compensation；Represent the alternate reactive capabilities that should be compensated of bc in negative sequence compensation network；Represent negative sequence compensation net
The alternate reactive capabilities that should be compensated of ca in network；The wattful power that a, b, c three phase unbalance current are produced is represented respectively
Rate；The reactive power that a, b, c three phase unbalance current are produced is represented respectively.
13. the adjusting method of the three-phase imbalance adjuster as claimed in claim 8 based on reactive-load compensation and intelligent commutation, its
Be characterized in, step 8 genetic algorithm implement including, according to vector basis because coding strategy carry out chromosome coding, produce just
Beginning population, calculates the fitness function of each individual in population, constantly carries out selection optimization, reaching the requirement of iterations
Under, obtain the optimal commutation control command of each low-voltage customer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710279465.9A CN107086591A (en) | 2017-04-25 | 2017-04-25 | A kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation |
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| CN107831364A (en) * | 2017-11-15 | 2018-03-23 | 哈尔滨理工大学 | A kind of electric energy harmonic detecting method |
| 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 |
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| CN108321815A (en) * | 2018-03-08 | 2018-07-24 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network utility power quality control system and method |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN108574293A (en) * | 2018-04-12 | 2018-09-25 | 国网山东省电力公司菏泽供电公司 | A kind of control method of compensation unbalanced power grid load |
| CN108736495A (en) * | 2018-07-03 | 2018-11-02 | 北京智创骏驰电气科技有限公司 | A kind of novel phase-change switch device |
| CN109274111A (en) * | 2018-11-29 | 2019-01-25 | 上海光维电力科技有限公司 | A kind of three-phase imbalance automatic regulating system |
| CN110380434A (en) * | 2019-07-03 | 2019-10-25 | 青岛鼎信通讯股份有限公司 | A kind of three-phase imbalance automatic adjustment algorithm based on phase-change switch |
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| CN111342466A (en) * | 2020-03-17 | 2020-06-26 | 山东华天电气有限公司 | Distributed three-phase unbalance and harmonic treatment device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107831364A (en) * | 2017-11-15 | 2018-03-23 | 哈尔滨理工大学 | A kind of electric energy harmonic detecting method |
| CN108134400A (en) * | 2017-11-29 | 2018-06-08 | 国网浙江省电力公司泰顺县供电公司 | For the administering method and device of three-phase imbalance |
| 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 |
| CN108110777A (en) * | 2018-02-13 | 2018-06-01 | 北京英博电气股份有限公司 | A kind of three-phase imbalance regulating device and system |
| CN108321815A (en) * | 2018-03-08 | 2018-07-24 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network utility power quality control system and method |
| CN108365605A (en) * | 2018-03-08 | 2018-08-03 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network three-phase line low-voltage governing system and method |
| CN108574293B (en) * | 2018-04-12 | 2021-11-19 | 国网山东省电力公司菏泽供电公司 | Control method for compensating unbalanced power grid load |
| CN108574293A (en) * | 2018-04-12 | 2018-09-25 | 国网山东省电力公司菏泽供电公司 | A kind of control method of compensation unbalanced power grid load |
| CN108736495A (en) * | 2018-07-03 | 2018-11-02 | 北京智创骏驰电气科技有限公司 | A kind of novel phase-change switch device |
| CN109274111A (en) * | 2018-11-29 | 2019-01-25 | 上海光维电力科技有限公司 | A kind of three-phase imbalance automatic regulating system |
| US11637430B2 (en) | 2019-01-30 | 2023-04-25 | Huawei Technologies Co., Ltd. | Power rectification method and apparatus |
| CN110380434A (en) * | 2019-07-03 | 2019-10-25 | 青岛鼎信通讯股份有限公司 | A kind of three-phase imbalance automatic adjustment algorithm based on phase-change switch |
| CN111130128A (en) * | 2019-12-01 | 2020-05-08 | 张翼洲 | Low-voltage automatic pre-distribution three-phase line balance box based on Internet of things and big data |
| CN111342466A (en) * | 2020-03-17 | 2020-06-26 | 山东华天电气有限公司 | Distributed three-phase unbalance and harmonic treatment device and method |
| CN111342466B (en) * | 2020-03-17 | 2024-01-09 | 山东华天电气有限公司 | Distributed three-phase imbalance and harmonic wave treatment device and method |
| CN111668842A (en) * | 2020-06-28 | 2020-09-15 | 上海兆铄科技有限公司 | Active power filter based on power line carrier communication |
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