CN105811419B - A kind of accurate control method for inhibiting mains by harmonics - Google Patents
A kind of accurate control method for inhibiting mains by harmonics Download PDFInfo
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- CN105811419B CN105811419B CN201610264512.8A CN201610264512A CN105811419B CN 105811419 B CN105811419 B CN 105811419B CN 201610264512 A CN201610264512 A CN 201610264512A CN 105811419 B CN105811419 B CN 105811419B
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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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- 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
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Abstract
A kind of accurate control method for inhibiting mains by harmonics, is characterized in that and is made of following steps：One, triangle wave generating circuit generates the carrier signal of power device drive signal；Grid side voltage detection signal exports modulating wave to signal comparator circuit through signal conditioning circuit；Two, grid side current detection signal is calculated through control chip A/D digitlizations and calculates the PWM drive signal for including inhibition mains by harmonics electric current for generating power device after the sum of inhibition power grid individual harmonic current voltage instantaneous value is superimposed by D/A outputs with modulating wave by comparison circuit with carrier signal again；Three, PWM drive signal is conveyed to harmonics restraint controller, then is exported through reactor by power conversion circuit and inhibit mains by harmonics electric current.The present invention using grid side voltage measurement signal and inhibit the voltage signal of mains by harmonics electric current as modulated signal and carrier signal compared with direct after exportable accurate inhibition mains by harmonics drive signal.
Description
Technical field：
The invention belongs to field of power system control, and in particular to a kind of accurate control method for inhibiting mains by harmonics.
Background technology：
A large amount of uses of power grid non-linear electrical equipment, the especially application of power electronic equipment are promoting Industry Control
While horizontal, power electronic devices it is non-linear so that harmonic pollution in electric power net is on the rise.Inhibit power grid using total digitalization
Harmonic wave technology presence, which cannot accurately control, inhibits mains by harmonics voltage, therefore can not really solve the problems, such as harmonic pollution in electric power net；
Using pure analogue technique the problem of control parameter is to administer mains by harmonics can not be adjusted according to mains by harmonics voltage in real time.
Invention content：
To solve the above problems, the present invention provides a kind of accurate control method for inhibiting mains by harmonics, the present invention utilizes
Grid side voltage measurement signal is straight as modulated signal and the adjustable carrier signal of frequency that sends out of simulation triangle wave generating circuit
The exportable accurate SPWM drive signals for inhibiting mains by harmonics controller realize auto-parallel function after connecing comparison.
The accurate control method for inhibiting mains by harmonics of the present invention, technical solution used for the above purpose are
It is made of following steps：
One, the carrier wave that power device drive signal in harmonics restraint controller is generated by simulating triangle wave generating circuit is believed
Number it is conveyed to signal comparator circuit；
Two, grid side voltage detection signal exports modulated signal to signal comparator circuit, grid side through signal conditioning circuit
Current detection signal exports the A/D input modules that chip is controlled to DSP after signal conditioning circuit improves, through A/D input modules
It is converted to digital signal progress frequency analysis and show that each primary current harmonic component size determines the amplitude of each harmonic voltage, calculate
Each harmonic voltage signal instantaneous value it is compound through DSP control chip D/A output modules export to high pass filter filters after again
It exports and gives signal adder circuit；
Three, inhibit the signal that each harmonic voltage composite signal of mains by harmonics electric current is converted through D/A output modules and electricity
Voltage on line side detect signal after the Signal averaging of signal condition again with carrier signal in signal comparator circuit after generate
Power device includes the PWM drive signal for inhibiting mains by harmonics electric current；
Four, the PWM drive signal of generation is conveyed to harmonics restraint controller by signal comparator circuit, then by harmonics restraint control
The power conversion circuit of device processed is conveyed to power grid through reactor.
Further, the carrier wave that the analog signal converted by network voltage is generated with simulation triangle wave generating circuit is believed
Number directly relatively obtain the amplitude of accurate SPWM drive signals control harmonics restraint controller output fundamental voltage, frequency, phase,
Phase sequence keeps consistent with power grid.
Further, grid side current detection signal carries out frequency analysis after A/D is converted and obtains individual harmonic current
Size, and then determine that the instantaneous value of each harmonic voltage and addition are inhibited the digitlization composite error value of mains by harmonics electric current
It is exported through D/A.
Further, the voltage composite error value of the inhibition mains by harmonics electric current through D/A is converted with network voltage
Voltage signal superposition again with carrier signal directly compared with obtain PWM drive signal control harmonics restraint controller output inhibit power grid
The voltage of individual harmonic current.
The beneficial effects of the invention are as follows：The present invention is using grid side voltage measurement signal as modulated signal and simulation triangle
The adjustable carrier signal of frequency that wave generation circuit is sent out exportable drive signal for inhibiting mains by harmonics after directly comparing, is realized
Harmonics restraint controller automatic identification network voltage phase sequence, automatically synchronous with network voltage frequency and voltage-phase and holding harmonic wave
Inhibit the fundamental voltage amplitude of controller output voltage close with grid voltage amplitude, the current signal obtained to grid side current detecting
Frequency analysis is carried out after DSP controls the A/D conversions of chip and obtains grid side electric current each harmonic amplitude, is controlled by harmonics restraint
The D/A output offset grid side each harmonic voltages weighting composite signal of the DSP control chips of device is superimposed power grid by adder
On the voltage measurement signal of side, to realize that mains by harmonics inhibits function.Harmonics restraint controller is connected through reactor with power grid, root
According to harmonics restraint controller output characteristics, in order to improve the control resolution ratio of harmonic voltage, the impedance of reactor can be more than often
Advise the impedance of reactor.
Description of the drawings：
Fig. 1 is that the present invention inhibits mains by harmonics principle schematic；
Fig. 2 is that accurate SPWM drive signals generate principle schematic；
Fig. 3 is 5 subharmonic inhibition figures.
Specific implementation mode：
Referring to Fig.1, the accurate inhibition mains by harmonics controller that the present invention designs mainly sends out triangular wave including analog circuit
Signal element, conditioning grid side voltage detection signal and analog circuit send out triangular signal matching unit, compared with output power
Through reactor output unit, it is defeated that the analog circuit sends out triangular signal unit for the drive signal unit of device, power conversion
Go out triangle wave amplitude to fix, the adjustable carrier signal of frequency；The conditioning grid side voltage detection signal is sent out with analog circuit
Triangular signal matching unit realizes grid side voltage detectingAs modulated signal, wherein x indicates electricity
Net three-phase voltage ABC, UmFor voltage magnitude, the π f of ω=2,For the phase of corresponding voltage signal, converted by signal conditioning circuit
It is matched so that grid side voltage detection signal sends out triangular signal with analog circuit；The driving of the relatively output power device
Signal element realizes that compared with modulation wave signal, power device is determined by the intersection point of carrier signal and modulation wave signal for carrier signal
Drive signal it is as shown in Figure 2；The power conversion is that harmonics restraint controller exports each phase output through reactor output unit
The fundamental voltage of voltage and each phase voltage same frequency of power grid, same-phase, same to amplitude, same to phase sequence, when perfect condition, controller output
Fundamental current be zero, therefore to improve the precision that mains by harmonics electric current inhibits, the impedance selection of reactor is more than conventional reactance
The impedance of device.
The accurate control method for inhibiting mains by harmonics of the present invention, is made of following steps：
One, the carrier wave that power device drive signal in harmonics restraint controller is generated by simulating triangle wave generating circuit is believed
Number it is conveyed to signal comparator circuit；
Two, grid side voltage detection signal exports modulated signal to signal comparator circuit, grid side through signal conditioning circuit
Current detection signal exports the A/D input modules that chip is controlled to DSP after signal conditioning circuit improves, through A/D input modules
It is converted to digital signal progress frequency analysis and show that each primary current harmonic component size determines the amplitude of each harmonic voltage, calculate
Each harmonic voltage signal instantaneous value it is compound through DSP control chip D/A output modules export to high pass filter filters after again
It exports and gives signal adder circuit；
Three, inhibit the signal that each harmonic voltage composite signal of mains by harmonics electric current is converted through D/A output modules and electricity
Voltage on line side detects signal and generates power after the Signal averaging of signal condition and carrier signal are in signal comparator circuit relatively
Device includes the PWM drive signal for inhibiting mains by harmonics electric current；
Four, the PWM drive signal of generation is conveyed to harmonics restraint controller by signal comparator circuit, then by harmonics restraint control
The power conversion circuit of device processed is conveyed to power grid through reactor.
Wherein, the analog signal converted by network voltage and the carrier signal that simulation triangle wave generating circuit generates are straight
Connect amplitude, frequency, phase, the phase sequence for comparing and obtaining accurate SPWM drive signals control harmonics restraint controller output fundamental voltage
It keeps consistent with power grid；Grid side current detection signal carries out frequency analysis after A/D is converted and obtains the big of individual harmonic current
It is small, and then determine that the instantaneous value of each harmonic voltage and addition are inhibited the digitlization composite error value warp of mains by harmonics electric current
D/A is exported；The voltage composite error value of inhibition mains by harmonics electric current through D/A and the voltage signal that network voltage converts are folded
Add again with carrier signal directly compared with show that PWM drive signal control harmonics restraint controller output inhibits power grid each harmonic electricity
The voltage of stream.
The power device drive signal of application simulation circuit engineering design of the present invention is sent out by simulation triangle wave generating circuit
Modulation letter of the voltage detection signal that the adjustable carrier signal of frequency and detection grid side obtain by signal conditioning circuit output
Number directly compared by signal comparator circuit and to export accurate SPWM drive signals, it is each mutually defeated that this drive signal controls power conversion circuit
Go out the fundamental voltage and network voltage same frequency, same-phase, same to amplitude, same phase sequence of voltage, and harmonics restraint controller is through reactance
The fundamental current very little exported after device is grid-connected predominantly inhibits the harmonic current of harmonic wave, therefore the switching frequency of controller can be with
Selection is higher to inhibit grid side harmonic current to ensure that harmonics restraint controller accurately exports each harmonic voltage；Detect power grid
The current detection signal that side obtains is converted to the direct current signal that can carry out A/D conversions through signal conditioning circuit, to digitized electricity
Stream signal do FFT operational analysis harmonic current components, and calculate size and the phase of each harmonic current with determine inhibit each time it is humorous
Each secondary voltage value of wave electric current is controlled the composite voltage signal value that each secondary voltage is added the harmonic current that is inhibited by DSP
The D/A output modules of chip export, then D/A output modules are exported to the composite signal for inhibiting grid side harmonic voltage by adder
Be superimposed on grid side detection and conditioned voltage signal with triangular wave that analog circuit is sent out directly compared with output inhibit electricity
The power device drive signal of net harmonic current, power device drive signal is pwm signal, by grid current harmonic analytic function
Closed loop adjusts the size for the composite signal for containing each harmonic voltage magnitude and phase accurately to inhibit mains by harmonics electric current.
Grid side current detection signal is improved after the A/D conversions for controlling chip by FFT calculating current harmonic component units
Realize grid side current detecting ix=Im sin(ωt+θx), wherein x indicates the power grid three-phase current π of ABC, ω=2 f, ImFor electric current
Amplitude, θxFor the phase of corresponding current signal, converted by signal conditioning circuit so that grid side current detection signal and control core
Piece A/D Interface Matchings；Harmonic current components composition is obtained to the progress operation of digitized current signal and harmonic current is big
Small and phase value thereby determines that each harmonic voltage swing for inhibiting individual harmonic current, each harmonic voltage value is added
It is exported to voltage composite signal and by the D/A interfaces of control chip, this signal is direct current signal, and friendship is converted to through high-pass filter
Flow signal；Voltage composite signal is superimposed through adder with conditioned grid side detection signal and exports PWM with triangle wave again
Drive signal control power inverter output contains each harmonic voltage signal for inhibiting grid side harmonic current；Because of harmonic wave
Inhibit controller output fundamental current small, mainly export individual harmonic current, in order to accurately export each harmonic voltage, according to electricity
It is mainly 3 times that host, which wants harmonic order, 5 times, 6 times, 7 times, 9 times, 11 features are with power frequency 50Hz, switching frequency 10kHz
Illustrate that the hop count of the carrier-modulated output of each harmonic voltage each cycle is respectively 65 sections, 39 sections, 32 sections, 27 sections, 21 sections and 17
Section.
Fig. 3 is that the inhibition of 5 subharmonic that amplitude is 1 set and 5 degree of time-harmonic wave inhibiting rates of practical harmonic wave phase angle difference is 91.2%,
Perfect condition harmonics restraint rate is 100%.
Claims (4)
1. a kind of accurate control method for inhibiting mains by harmonics, it is characterised in that be made of following steps：
One, defeated by simulating the carrier signal of power device drive signal in triangle wave generating circuit generation harmonics restraint controller
Give signal comparator circuit；
Two, grid side voltage detection signal exports modulated signal to signal comparator circuit, grid side electric current through signal conditioning circuit
Detection signal exports the A/D input modules that chip is controlled to DSP after signal conditioning circuit improves, and is converted through A/D input modules
Frequency analysis is carried out for digital signal and show that each primary current harmonic component size determines the amplitude of each harmonic voltage, is calculated each time
The compound D/A output modules that chip is controlled through DSP of harmonic voltage signal instantaneous value export again after exporting to high pass filter filters
To signal comparator circuit；
Three, inhibit the signal and grid side that each harmonic voltage composite signal of mains by harmonics electric current is converted through D/A output modules
Voltage detection signal after the Signal averaging of signal condition again with carrier signal in signal comparator circuit after generate power
Device includes the PWM drive signal for inhibiting mains by harmonics electric current；
Four, the PWM drive signal of generation is conveyed to harmonics restraint controller by signal comparator circuit, then by harmonics restraint controller
Power conversion circuit be conveyed to power grid through reactor；Harmonics restraint controller export fundamental current it is small, mainly export each time it is humorous
Wave electric current, in order to accurately export each harmonic voltage, according to power grid major harmonic order be mainly 3 times, 6 times, 9 features with
Power frequency 50Hz, switching frequency be 10kHz illustrate the hop count of the carrier-modulated output of each harmonic voltage each cycle be respectively 65 sections,
32 sections and 21 sections.
2. a kind of accurate control method for inhibiting mains by harmonics as described in claim 1, it is characterised in that：Become by network voltage
The analog signal got in return and carrier signal that simulation triangle wave generating circuit generates directly compared with show that accurate SPWM driving is believed
Number control harmonics restraint controller output amplitude of fundamental voltage, frequency, phase, phase sequence keep consistent with power grid.
3. a kind of accurate control method for inhibiting mains by harmonics as described in claim 1, it is characterised in that：Grid side electric current is examined
It surveys signal and carries out the size that frequency analysis obtains individual harmonic current after A/D is converted, and then determine the reality of each harmonic voltage
Duration is simultaneously added the digitlization composite error value of mains by harmonics electric current of being inhibited and is exported through D/A.
4. a kind of accurate control method for inhibiting mains by harmonics as described in claim 1, it is characterised in that：Inhibition through D/A
The voltage composite error value of mains by harmonics electric current is superimposed again direct with carrier signal with the voltage signal that network voltage converts
Compare the voltage for showing that PWM drive signal control harmonics restraint controller output inhibits power grid individual harmonic current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610264512.8A CN105811419B (en) | 2016-04-25 | 2016-04-25 | A kind of accurate control method for inhibiting mains by harmonics |
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| CN201610264512.8A CN105811419B (en) | 2016-04-25 | 2016-04-25 | A kind of accurate control method for inhibiting mains by harmonics |
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| CN105811419B true CN105811419B (en) | 2018-08-21 |
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| CN110286278B (en) * | 2019-06-04 | 2021-12-03 | 广州智光电气技术有限公司 | Output voltage control method and device and power grid adaptability detection platform |
| CN113131811A (en) * | 2021-04-14 | 2021-07-16 | 中国船舶重工集团公司第七0三研究所 | FPGA-based stepping motor driving method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201219199Y (en) * | 2008-05-29 | 2009-04-08 | 武汉科技大学 | Full digital active electric power filtering controller |
| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
| CN203135442U (en) * | 2012-03-15 | 2013-08-14 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric drilling machine |
| CN103595051A (en) * | 2013-11-25 | 2014-02-19 | 东南大学 | Harmonic current tracking control method for active power filter |
| CN104934989A (en) * | 2015-07-09 | 2015-09-23 | 哈尔滨理工大学 | Reactive power compensation device based on novel modular multilevel topology and control method thereof |
| CN204886186U (en) * | 2015-07-21 | 2015-12-16 | 同济大学 | Hybrid control system based on harmonic restraines and reactive compensation |
| CN205489530U (en) * | 2016-04-14 | 2016-08-17 | 哈尔滨理工大学 | Automatic synchronous accurate control electric wire netting harmonic device |
-
2016
- 2016-04-25 CN CN201610264512.8A patent/CN105811419B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201219199Y (en) * | 2008-05-29 | 2009-04-08 | 武汉科技大学 | Full digital active electric power filtering controller |
| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
| CN203135442U (en) * | 2012-03-15 | 2013-08-14 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric drilling machine |
| CN103595051A (en) * | 2013-11-25 | 2014-02-19 | 东南大学 | Harmonic current tracking control method for active power filter |
| CN104934989A (en) * | 2015-07-09 | 2015-09-23 | 哈尔滨理工大学 | Reactive power compensation device based on novel modular multilevel topology and control method thereof |
| CN204886186U (en) * | 2015-07-21 | 2015-12-16 | 同济大学 | Hybrid control system based on harmonic restraines and reactive compensation |
| CN205489530U (en) * | 2016-04-14 | 2016-08-17 | 哈尔滨理工大学 | Automatic synchronous accurate control electric wire netting harmonic device |
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Inventor after: Kang Erliang Inventor after: Gu Bowen Inventor after: Han Kangwei Inventor before: Kang Erliang Inventor before: Gu Bowen |
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Effective date of registration: 20170918 Address after: 150080 Harbin, Heilongjiang, Nangang District Road, No. 52 Applicant after: Harbin University of Science and Technology Applicant after: Electromechanical Products Detecting Technology Center of Shanghai Entry-Exit Inspection and Quarantine Bureau Address before: 150080 Harbin, Heilongjiang, Nangang District Road, No. 52 Applicant before: Harbin University of Science and Technology |
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