CN108390385A - Electrical Harmonic Detection and restraining device and method - Google Patents
Electrical Harmonic Detection and restraining device and method Download PDFInfo
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- CN108390385A CN108390385A CN201810458906.6A CN201810458906A CN108390385A CN 108390385 A CN108390385 A CN 108390385A CN 201810458906 A CN201810458906 A CN 201810458906A CN 108390385 A CN108390385 A CN 108390385A
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of electrical Harmonic Detections and restraining device and method, including system power supply, three-phase four-wire system power load, electrical harmonics restraint unit, control system；Voltage transformer is connected between system power supply and electrical harmonics restraint unit, voltage transformer output end is connected to the system voltage sample port of control system；Load current mutual-inductor is electrically installed between harmonics restraint unit and three-phase four-wire system power load, the output end of load current mutual-inductor is connected to the load current sample port of control system；The PWM drive signal port of control system is connected to the driving circuit of electrical harmonics restraint unit.The early warning to electrical harmonic wave may be implemented using the sampled data of load current, system voltage in the present invention；By inhibiting unit, the inhibition to electrical harmonic wave may be implemented；It can inhibit effective probability of happening for reducing electrical fire in terms of two before early warning before calamity and calamity.
Description
Technical field
The invention patent relates to a kind of electrical Harmonic Detection and restraining devices, more particularly to one kind is for electrical fire safety
The method of the detection and restraining device of the electrical harmonic wave of one of hidden danger.
Background technology
With the rapid development of social economy, the reasons such as social electrifing degree is continuously improved, and power load is excessive cause
Electrical fire generation is more and more frequent, and fire quantity is in rising trend.Integrated data statistics shows electrical fire in fire entirety
30% or more is accounted in quantity, especially more flourishing place, this data can rise to 50%.The reason of electrical fire master
Have following several：Overload, insulation ag(e)ing, discharge spark, illuminator electric heater, crosses under-voltage, is non-linear negative hot-spot
Lotus etc..Wherein result has caused by the presence of electrical harmonic wave：Power factor is low, leads to circuit overload, makes compensating electric capacity
Electric current increase, formed overheated type fire hazard；Overcurrent protective device or residual current operated protective device is set to malfunction；3 subharmonic shapes
The neutral conductor is caused to overload at current in middle wire；Certain harmonic forms forms high current, high voltage at series connection or shunt-resonant circuit；Production
Myogenic skin effect makes cable temperature increase, accelerates insulating layer aging.It can be seen that electrical harmonic wave is the root of essential electrical fire
Source, to reduce the hidden danger of electrical fire from the root cause it is necessary to being done from electrical harmonic wave early warning and inhibition.
Electrical Harmonic Detection carries out technology analysis with restraining device by the sampled data to system voltage and load current,
The electrical harmonic content for calculating load circuit gives exceeded early warning according to electrical harmonic content definite value；Using modern electric electricity
Sub- device, inversion go out the harmonic wave equal with load opposite in phase quantity and offset therewith, it is suppressed that the electrical harmonic wave of system reduces
Because of the security risk of electrical fire caused by electrical harmonic wave exists.By inhibiting harmonic wave to reduce the skin effect of harmonic current
It answers, slows down electric insulation aging, reduce cable Wen Sheng, the generation of the danger and equipment malfunction work that reduce system resonance is general
Rate.The early warning of electrical Harmonic Detection and restraining device and the generation for inhibiting function to reduce electrical fire in electrical harmonic wave root are general
Rate.
Electrical Harmonic Detection is to reduce one of the important means of electrical fire security risk with restraining device, is not had in fire
The generation for inhibiting fire before occurring, is preventive from possible trouble；And there is data analysis function, for the electricity that can cause electrical fire
Tolerance is mutated, and can play certain forewarning function.
Invention content
The purpose of patent of the present invention is to reduce the electric disaster hidden-trouble caused due in power load there are electrical harmonic wave,
Early warning and inhibiting effect played to electrical harmonic wave present in power load, reduces the electrical harmonic wave in power load, reduce because
The electrical fires root such as electric cable heating, insulation ag(e)ing, system resonance caused by skin effect.
Technical solution is used by patent of the present invention solves its technical problem：
The electrical Harmonic Detection and restraining device, including system power supply, be connected with the output end of system power supply
Three-phase four-wire system power load, the electrical harmonics restraint unit being attempted by between system power supply and power load.
System voltage mutual inductor, the output of voltage transformer are connected between system power supply and electrical harmonics restraint unit
End is connected to the system voltage sample port of control system；
It is installed with load current mutual-inductor, load current between three-phase four-wire system power load and electrical harmonics restraint unit
The output end of mutual inductor is connected to the load current sample port of control system；
It is defeated equipped with alarm communication system port, system voltage sample port, load current sample port, PWM in the controls
Exit port, output current sample port, DC voltage sample port；The pwm pulse output signal port of control system directly connects
It is connected to the driving circuit of electrical harmonics restraint unit.
Further preferred, the electrical harmonics restraint unit is by output reactance device, by insulated gate bipolar crystal
The capacitance of three phase full bridge inversion unit, two groups of concatenations that pipe IGBT is constituted forms；In output reactance device and three phase full bridge inversion list
It is worn between member and is connected to output current transformer, the output end of output current transformer is connected to the output current sampling of control system
Port；The DC side of three phase full bridge inversion unit connects the capacitance of two groups of concatenations, is connected with the midpoint of the capacitance of two groups of concatenations
It is zero curve n, the positive and negative both ends of the capacitance of two groups of concatenations are connected to DC voltage transformer, and the output end of DC voltage transformer connects
It is connected to the DC voltage sample port of control system.
The control method of the electrical Harmonic Detection and restraining device, includes the following steps：
Step 1), the sampled signal that mutual inductor is sampled by system voltage, analog to digital conversion circuit by control system it
The digital quantity signal of system voltage is obtained afterwards, then after the no-load voltage ratio of system voltage mutual inductor is converted, three-phase system is calculated
Unite voltage actual discrete instantaneous value signal Usa, Usb, Usc, by FFT (Fast Fourier Transform (FFT)) program, calculate A,
B, the 1-25 voltage harmonic aberration rate THDvn and total voltage percent harmonic distortion THDv of each phases of C；
The sampled signal that mutual inductor is sampled by output current, the analog to digital conversion circuit by control system obtain defeated later
Go out the digital quantity signal of electric current, then after the no-load voltage ratio of output current transformer is converted, it is real that three-phase output current is calculated
The discrete instantaneous value signal ia on borderout、ibout、icout；
The sampled signal that mutual inductor is sampled by DC voltage, the analog to digital conversion circuit by control system obtain straight later
The digital quantity signal of galvanic electricity pressure, then after the no-load voltage ratio of DC voltage transformer is converted, it is actual that DC voltage is calculated
Discrete instantaneous value signal, to this signal by the cumulative summation of a power frequency time cycle simultaneously divided by week power frequency time
Sampling number in phase obtains DC voltage effective value UDC；
The sampled signal that mutual inductor is sampled by load current, the analog to digital conversion circuit by control system are born later
The digital quantity signal of charged current, then after the no-load voltage ratio of load current mutual-inductor is converted, it is real that three-phase load electric current is calculated
Discrete instantaneous value signal ila, ilb, the ilc on border calculates each phase of A, B, C by FFT (Fast Fourier Transform (FFT)) program
1-25 primary current percent harmonic distortion THDin and total current percent harmonic distortion THDi.
Step 2), basis《GB/T 14549-1993 power quality utility network harmonic waves》National standard, it is humorous for voltage
The prescribed limits of wave total harmonic distortion and each primary current percent harmonic distortion (or being converted to current harmonics total harmonic distortion), according to limit value
Harmonic wave early warning definite value is set, and is stored in the FLASH of control system；When the THDv in 5 power frequency periods or THDin (or
THDi average value) is more than definite value, and electrical Harmonic Detection sends out the acousto-optic early warning of harmonic wave overdetermination value with restraining device in 30s,
And starts inhibit function immediately.
Step 3) calculates fundamental current using Fourier's program, and Fourier transformation program is following (by taking A phases as an example)：
(1) Fourier space of load current is：
Wherein：F (t) is load current function, A0For DC component, an=Ansinφ1, bn=Ancosφ1,
(2) to the calculating of load fundamental current, it is only necessary to calculate fundamental wave Fourier coefficient a1And b1：
(3) according to integral principle, fundamental wave Fourier coefficient a is calculated1And b1, and ignore A0The influence of DC component, then
It is available：
The load fundamental current of A phases is：B_ila=a1cos nωt+b1sin nωt
Fundamental current B_ilb, C_ilb of B, C two-phase can similarly be obtained.
Step 4), the inhibition desired value ia for calculating harmonic currenttarget、ibtarget、ictarget：
After being subtracted each other by fundamental current B_ila, B_ilb, B_ilc and momentary load electric current ila, ilb, ilc of load current
Be inhibited desired value；Simultaneously to the virtual value U of DC voltage in a cycleDCWith DC voltage desired value (in holddown
Shi Zhiliu needs target to be achieved) it is controlled through a PI, obtain an active component U for maintaining DC voltage to needDCPI：
iatarget=(B_ila)-ila+UDCPI
ibtarget=(B_ilb)-ilb+UDCPI
ictarget=(B_ilc)-ilc+UDCPI
Step 5), according to Hysteresis control theory, by inhibition desired value iatarget、ibtarget、ictargetElectricity is exported with three-phase
Flow actual discrete instantaneous value signal iaout、ibout、icoutComparison can obtain control IGBT switch equation：
iatarget-iaout≥WAKA=1；
iatarget-iaout≤WAKA=0；
ibtarget-ibout≥WAKB=1；
ibtarget-ibout≤WAKB=0；
ictarget-icout≥WAKC=1；
ictarget-icout≤WAKC=0；
Wherein：WAFor ring width electric current, KA, KB, KC A, B, C three-phase bridge arm IGBT on off state, when the KA=1 epoch
Table, bridge arm is opened in A phases, and lower bridge arm is closed；It is represented as KA=0, bridge arm is closed in A phases, and lower bridge arm is opened；B, C two-phases with
This is similarly.
Step 6), the on off state according to the IGBT of A, B, C three-phase bridge arm of step 5 calculated KA, KB, KC, generate
PWM trigger pulse sequences control insulated gate bipolar transistor IGBT turn-on and turn-off through IGBT drive circuit, to control suppression
Unit output processed, reaches inhibition desired value.
Advantageous effect is possessed by patent of the present invention：
A kind of electrical Harmonic Detection described in patent of the present invention and restraining device have early warning electrical fire, inhibit electricity consumption
The function of electrical harmonic wave in load, functionally early warning prompt the hidden danger emphasis of electrical fire；Inhibit from the root cause, reduces
Cable Wen Sheng, the emphasis hidden danger for slowing down the electrical fires such as insulation ag(e)ing, removal system resonance.
Description of the drawings
Fig. 1：The circuit system of patent of the present invention.
Fig. 2：The electrical harmonics restraint unit main circuit of patent of the present invention.
In figure：1, three-phase four-wire system power load, 2, electrical harmonics restraint unit, 3, control system, 4, system voltage it is mutual
Sensor, 5, load current mutual-inductor, 6, three-phase four-wire system power supply, 7, driving circuit, 8, DC voltage transformer, 9, output
Reactor, 10, output current transformer, the capacitance of 11, two groups of concatenations, 12, three phase full bridge inversion unit.
Specific implementation mode
Patent of the present invention is described in further detail with specific implementation example below in conjunction with the accompanying drawings：This embodiment with
Implemented under premised on art solutions of the present invention, gives embodiment and operating process, but the guarantor of patent of the present invention
Shield range is not limited to following embodiments.
Fig. 1 is the system structure diagram of electrical Harmonic Detection and restraining device that patent of the present invention proposes, including three-phase four
Line system power supply 6, the three-phase four-wire system power load 1 being connected with the output end of three-phase four-wire system power supply 6, is attempted by
Electrical harmonics restraint unit 2 between three-phase four-wire system power supply 6 and three-phase four-wire system power load 1, control system 3 are
System voltage transformer 4, load current mutual-inductor 5, driving circuit 7, DC voltage transformer 8；
In the present embodiment, system voltage is connected between three-phase four-wire system power supply 6 and electrical harmonics restraint unit 2
The output end of mutual inductor 4, system voltage mutual inductor 4 is connected to the system voltage sample port of control system 3；
In the present embodiment, it is mutual between three-phase four-wire system power load 1 and electrical harmonics restraint unit 2 to be installed with load current
The output end of sensor 5, load current mutual-inductor 5 is connected to the load current sample port of control system 3；
In the present embodiment, adopted equipped with alarm communication system port, system voltage sample port, load current in control system 3
Sample port, PWM output ports, output current sample port, DC voltage sample port；
In the present embodiment, the pwm pulse output signal port of control system 3 is directly connected to electrical harmonics restraint unit 2
Driving circuit.
The electrical harmonics restraint unit 2 (as shown in Figure 2) is by output reactance device 9, by insulated gate bipolar crystal
The capacitance 11 of 12, two groups of concatenations of three phase full bridge inversion unit that pipe IGBT is constituted forms；It is inverse in output reactance device 9 and three phase full bridge
It is worn between change unit 12 and is connected to output current transformer 10, the output end of output current transformer 10 is connected to control system 3
Output current sample port；The DC side of three phase full bridge inversion unit 12 connects the capacitance 11 of two groups of concatenations, is concatenated with two groups
That the midpoint of capacitance 11 is connected is zero curve n, and the positive and negative both ends of the capacitance 11 of two groups of concatenations are connected to DC voltage transformer 8, directly
The output end of stream voltage transformer 8 is connected to the DC voltage sample port of control system 3.
The control method of electrical Harmonic Detection and restraining device of the present invention, includes the following steps：
Step 1), the sampled signal that mutual inductor is sampled by system voltage, analog to digital conversion circuit by control system it
The digital quantity signal of system voltage is obtained afterwards, then after the no-load voltage ratio of system voltage mutual inductor is converted, three-phase system is calculated
Unite voltage actual discrete instantaneous value signal Usa, Usb, Usc, by FFT (Fast Fourier Transform (FFT)) program, calculate A,
B, the 1-25 voltage harmonic aberration rate THDvn and total voltage percent harmonic distortion THDv of each phases of C；
The sampled signal that mutual inductor is sampled by output current, the analog to digital conversion circuit by control system obtain defeated later
Go out the digital quantity signal of electric current, then after the no-load voltage ratio of output current transformer is converted, it is real that three-phase output current is calculated
The discrete instantaneous value signal ia on borderout、ibout、icout；
The sampled signal that mutual inductor is sampled by DC voltage, the analog to digital conversion circuit by control system obtain straight later
The digital quantity signal of galvanic electricity pressure, then after the no-load voltage ratio of DC voltage transformer is converted, it is actual that DC voltage is calculated
Discrete instantaneous value signal, to this signal by the cumulative summation of a power frequency time cycle simultaneously divided by week power frequency time
Sampling number in phase obtains DC voltage effective value UDC；
The sampled signal that mutual inductor is sampled by load current, the analog to digital conversion circuit by control system are born later
The digital quantity signal of charged current, then after the no-load voltage ratio of load current mutual-inductor is converted, it is real that three-phase load electric current is calculated
Discrete instantaneous value signal ila, ilb, the ilc on border calculates each phase of A, B, C by FFT (Fast Fourier Transform (FFT)) program
1-25 primary current percent harmonic distortion THDin and total current percent harmonic distortion THDi.
Step 2), basis《GB/T 14549-1993 power quality utility network harmonic waves》National standard, it is humorous for voltage
The prescribed limits of wave total harmonic distortion and each primary current percent harmonic distortion (or being converted to current harmonics total harmonic distortion), according to limit value
Harmonic wave early warning definite value is set, and is stored in the FLASH of control system；When the THDv in 5 power frequency periods or THDin (or
THDi average value) is more than definite value, and electrical Harmonic Detection sends out the acousto-optic early warning of harmonic wave overdetermination value with restraining device in 30s,
And starts inhibit function immediately.
Step 3) calculates fundamental current using Fourier's program, and Fourier transformation program is following (by taking A phases as an example)：
(1) Fourier space of load current is：
Wherein：F (t) is load current function, A0For DC component, an=Ansinφ1, bn=Ancosφ1,
(2) to the calculating of load fundamental current, it is only necessary to calculate fundamental wave Fourier coefficient a1And b1：
(3) according to integral principle, fundamental wave Fourier coefficient a is calculated1And b1, and ignore A0The influence of DC component, then
It is available：
The load fundamental current of A phases is：B_ila=a1cos nωt+b1sin nωt
Fundamental current B_ilb, C_ilb of B, C two-phase can similarly be obtained.
Step 4), the inhibition desired value ia for calculating harmonic currenttarget、ibtarget、ictarget：
After being subtracted each other by fundamental current B_ila, B_ilb, B_ilc and momentary load electric current ila, ilb, ilc of load current
Be inhibited desired value；Simultaneously to the virtual value U of DC voltage in a cycleDCWith DC voltage desired value (in holddown
Shi Zhiliu needs target to be achieved) it is controlled through a PI, obtain an active component U for maintaining DC voltage to needDCPI：
iatarget=(B_ila)-ila+UDCPI
ibtarget=(B_ilb)-ilb+UDCPI
ictarget=(B_ilc)-ilc+UDCPI
Step 5), according to Hysteresis control theory, by inhibition desired value iatarget、ibtarget、ictargetElectricity is exported with three-phase
Flow actual discrete instantaneous value signal iaout、ibout、icoutComparison can obtain control IGBT switch equation：
iatarget-iaout≥WAKA=1；
iatarget-iaout≤WAKA=0；
ibtarget-ibout≥WAKB=1；
ibtarget-ibout≤WAKB=0；
ictarget-icout≥WAKC=1；
ictarget-icout≤WAKC=0；
Wherein：WAFor ring width electric current, KA, KB, KC A, B, C three-phase bridge arm IGBT on off state, when the KA=1 epoch
Table, bridge arm is opened in A phases, and lower bridge arm is closed；It is represented as KA=0, bridge arm is closed in A phases, and lower bridge arm is opened；B, C two-phases with
This is similarly.
Step 6), the on off state according to the IGBT of A, B, C three-phase bridge arm of step 5 calculated KA, KB, KC, generate
PWM trigger pulse sequences control insulated gate bipolar transistor IGBT turn-on and turn-off through IGBT drive circuit, to control suppression
Unit output processed, reaches inhibition desired value.
Patent of the present invention is directed to the present situation that current electrical fire accident is growing, for the electrical harmonic wave in power load
The hidden danger place that early warning in time finds electrical fire is capable of in progress detection alarm and inhibition；And it effectively reduces because electrical harmonic wave is deposited
Cable temperature rises the electricity such as excessively high, current in middle wire is excessive, insulation ag(e)ing is fast, Harmonious Waves in Power Systems resonance, system overvoltage caused by
Gas fire incident；The fire hazard of electric fire-control is solved from the root of electrical harmonic wave.
Claims (3)
1. a kind of electrical Harmonic Detection and restraining device, including it is system power supply (6), three-phase four-wire system power load (1), electrical humorous
Wave inhibits unit (2), control system (3)；It is characterized in that：Electrical harmonics restraint unit (2) is attempted by system power supply (6) and three
Between phase four-wire system power load (1)；It is connected with system voltage between system power supply (6) and electrical harmonics restraint unit (2)
Mutual inductor (4), the output end of system voltage mutual inductor (4) are connected to the system voltage sample port of control system (3)；In three-phase
Load current mutual-inductor (5), load current mutual inductance are installed between four-wire system power load (1) and electrical harmonics restraint unit (2)
The output end of device (5) is connected to the load current sample port of control system (3)；
Alarm communication system port, system voltage sample port, load current sample port, PWM outputs are equipped in control system (3)
Port, output current sample port, DC voltage sample port；The pwm pulse output signal port of control system (3) directly connects
It is connected to the driving circuit of electrical harmonics restraint unit (2).
2. electrical Harmonic Detection according to claim 1 and restraining device, it is characterised in that：The electrical harmonics restraint
Unit (2) be the three phase full bridge inversion unit (12) constituted by output reactance device (9), by insulated gate bipolar transistor IGBT,
The capacitance (11) of two groups of concatenations forms；It is worn between output reactance device (9) and three phase full bridge inversion unit (12) and is connected to output electricity
Current transformer (10), the output end of output current transformer (10) are connected to the output current sample port of control system (3)；Three
The DC side of phase full-bridge inverting unit (12) connects the capacitance (11) of two groups of concatenations, with the midpoint phase of two groups of capacitances concatenated (11)
That connect is zero curve n, and the positive and negative both ends of the capacitance (11) of two groups of concatenations are connected to DC voltage transformer (8), DC voltage mutual inductance
The output end of device (8) is connected to the DC voltage sample port of control system (3).
3. a kind of control method of electrical Harmonic Detection and restraining device as described in claim 1, it is characterised in that：Including with
Lower step：
Step 1), the sampled signal that mutual inductor (4) is sampled by system voltage, by the analog to digital conversion circuit of control system (3)
The digital quantity signal of system voltage is obtained later, then after the no-load voltage ratio of system voltage mutual inductor (4) is converted, is calculated three
Phase system voltage actual discrete instantaneous value signal Usa, Usb, Usc are calculated by FFT (Fast Fourier Transform (FFT)) program
Go out the 1-25 voltage harmonic aberration rate THDvn and total voltage percent harmonic distortion THDv of each phase of A, B, C；
The sampled signal that mutual inductor (10) is sampled by output current, the analog to digital conversion circuit by control system (3) obtain later
To the digital quantity signal of output current, then after the no-load voltage ratio of output current transformer is converted, three-phase output electricity is calculated
Flow actual discrete instantaneous value signal iaout、ibout、icout；
The sampled signal that mutual inductor (8) is sampled by DC voltage, the analog to digital conversion circuit by control system (3) obtain later
The digital quantity signal of DC voltage, then after the no-load voltage ratio of DC voltage transformer (8) is converted, direct current compacting is calculated
The discrete instantaneous value signal on border passes through the cumulative summation of a power frequency time cycle and divided by a power frequency to this signal
Between sampling number in the period, obtain DC voltage effective value UDC；
The sampled signal that mutual inductor (5) is sampled by load current, the analog to digital conversion circuit by control system (3) obtain later
The digital quantity signal of load current, then after the no-load voltage ratio of load current mutual-inductor is converted, three-phase load electric current is calculated
Actual discrete instantaneous value signal ila, ilb, ilc calculate each phase of A, B, C by FFT (Fast Fourier Transform (FFT)) program
1-25 primary current percent harmonic distortion THDin and total current percent harmonic distortion THDi.
Step 2), basis《GB/T 14549-1993 power quality utility network harmonic waves》National standard, it is total for voltage harmonic
The prescribed limits of aberration rate and each primary current percent harmonic distortion (or being converted to current harmonics total harmonic distortion), are arranged according to limit value
Harmonic wave early warning definite value, and be stored in (3) FLASH of control system；When the THDv in 5 power frequency periods or THDin (or
THDi average value) is more than definite value, and electrical Harmonic Detection sends out the acousto-optic early warning of harmonic wave overdetermination value with restraining device in 30s,
And starts inhibit function immediately.
Step 3) calculates fundamental current using Fourier's program, and Fourier transformation program is following (by taking A phases as an example)：
(1) Fourier space of load current is：
Wherein：F (t) is load current function, A0For DC component, an=An sin φl, bn=An cos φl,
(2) to the calculating of load fundamental current, it is only necessary to calculate fundamental wave Fourier coefficient a1And b1：
(3) according to integral principle, fundamental wave Fourier coefficient a is calculated1And b1, and ignore A0The influence of DC component can then obtain
It arrives：
The load fundamental current of A phases is：B_ila=a1 cos nωt+b1 sin nωt
Fundamental current B_ilb, C_ilb of B, C two-phase can similarly be obtained.
Step 4), the inhibition desired value ia for calculating harmonic currentt arg et、ibt arg et、ict arg et：
It is obtained after being subtracted each other by fundamental current B_ila, B_ilb, B_ilc and momentary load electric current ila, ilb, ilc of load current
Inhibit desired value；Simultaneously to the virtual value U of DC voltage in a cycleDCIt is (in holddown straight with DC voltage desired value
Stream needs target to be achieved) it is controlled through a PI, obtain an active component U for maintaining DC voltage to needDCPI：
iat arg et=(B_ila)-ila+UDCPI
ibt arg et=(B_ilb)-ilb+UDCPI
ict arg et=(B_ilc)-ilc+UDCPI
Step 5), according to Hysteresis control theory, by inhibition desired value iat arg et、ibt arg et、ict arg etElectricity is exported with three-phase
Flow actual discrete instantaneous value signal iaout、ibout、icoutComparison can obtain control IGBT switch equation：
iat arg et-iaout≥WAKA=1；
iat arg et-iaout≤WAKA=0；
ibt arg et-ibout≥WAKB=1；
ibt arg et-ibout≤WAKB=0；
ict arg et-icout≥WAKC=1；
ict arg et-icout≤WAKC=0；
Wherein：WAFor ring width electric current, KA, KB, KC A, B, C three-phase bridge arm IGBT on off state, represented as KA=1, A
Bridge arm is opened in phase, and lower bridge arm is closed；It is represented as KA=0, bridge arm is closed in A phases, and lower bridge arm is opened；B, C two-phases are same with this
Reason.
Step 6), the on off state according to the IGBT of A, B, C three-phase bridge arm of step 5 calculated KA, KB, KC, generate PWM and touch
Pulse train is sent out, insulated gate bipolar transistor IGBT turn-on and turn-off are controlled through IGBT drive circuit, inhibits single to control
Member output, reaches inhibition desired value.
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| CN201810458906.6A CN108390385A (en) | 2018-05-15 | 2018-05-15 | Electrical Harmonic Detection and restraining device and method |
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|---|---|---|---|
| CN201810458906.6A CN108390385A (en) | 2018-05-15 | 2018-05-15 | Electrical Harmonic Detection and restraining device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066584A (en) * | 2018-08-13 | 2018-12-21 | 国网浙江省电力有限公司绍兴供电公司 | A kind of capacitor harmonic protection method of high protection act precision |
| CN110148965A (en) * | 2019-05-27 | 2019-08-20 | 云南电网有限责任公司电力科学研究院 | A kind of adaptive approach of active converter cutting-in control point sampling mutual inductor |
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