CN102983571A - Harmonic transfer type three-phase harmonic elimination circuit - Google Patents
Harmonic transfer type three-phase harmonic elimination circuit Download PDFInfo
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- CN102983571A CN102983571A CN2012105046642A CN201210504664A CN102983571A CN 102983571 A CN102983571 A CN 102983571A CN 2012105046642 A CN2012105046642 A CN 2012105046642A CN 201210504664 A CN201210504664 A CN 201210504664A CN 102983571 A CN102983571 A CN 102983571A
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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
- Y02E40/30—Reactive power compensation
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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
The invention discloses a harmonic transfer type three-phase harmonic elimination circuit. Output terminals of a three-phase power network are respectively connected in series with one end of corresponding impedance protection inductors, and the other ends of the impedance protection inductors are respectively connected with three corresponding input terminals of a three-phase full bridge rectifier and filter circuit; six same power switch devices are respectively connected in series with six reverse protection diodes and then connected in parallel between the impedance protection inductors and the three input terminals of the three-phase full bridge rectifier and filter circuit; two serially-connected power switch devices and diodes are connected to each phase of the three-phase full bridge rectifier and filter circuit; three current sensors are respectively and correspondingly connected in parallel between the impedance protection inductors and the output terminals of the three-phase power network; output terminals of the current sensors are respectively connected with corresponding band-pass filters; output terminals of the band-pass filters are connected to a pulse-width modulation (PWM) module; and six output terminals of the PWM module are respectively connected with control ends of the six power switch devices. If the harmonic current of one phase of the three-phase power network is increased, the corresponding power switch devices are connected and surplus harmonic current is diverted to other phases of the three-phase power network.
Description
Technical field
The present invention relates to a kind of circuit structure, specifically three phase harmonic is administered circuit.
Background technology
The alternating current that is provided by three phase network can not directly be used by power consumption equipment generally speaking, AC rectification must be become direct current after, carry out necessary conversion by semiconductor device again, make it to reach requirement and just can be utilized.After power surpasses to a certain degree, just can not use single phase power supply, to prevent causing accident of power supply owing to the triple line current imbalance.Interchange when three phase network is powered turns in the DC circuit, must use diode (or controllable silicon etc.) and carry out rectification, and in the diode rear end in order to obtain stable electric current and voltage, also can come flat ripple with inductance capacitor filtering circuit or pure electric capacity.Like this, the nonlinear operation meeting that discharges and recharges level and diode of filter capacitor causes in three phase network occurring 5 times, 7 inferior higher harmonic currents, need to be with its improvement in order to avoid affect the electrical network miscellaneous equipment, and correct power factor, it is idle to improve meritorious reduction.
Have at present than the multi-method improvement of being correlated with, comprise three-phase resolve into boost (BOOST) after single-phase, the mode such as step-down (Buck) proofreaies and correct, comprise that also various LC power back-off equipment carry out power factor correction and harmonic wave control, are circumscribed with in addition in addition source filter and administer.Wherein, it is a kind of method at present relatively more commonly used that three-phase is decomposed into single-phase mode, but it has increased the one-level high-frequency switch circuit and sealed in energy storage inductor, utilizes the magnetic energy that charges and discharge of energy storage inductor.Because high-frequency switch circuit is the complicated wave form of triangular wave and square wave combination, as long as wherein there are the nonlinear devices such as diode, the capital causes because high-frequency current and nonlinear device consist of mixing, difference frequency and the interference such as frequency, frequency multiplication, and is therefore difficult to the external interference control of containing high frequency electromagnetic radiation emission, conduction emission.Simultaneously, three-phase is decomposed into single-phase pattern must reliable zero line, otherwise can cause certain phase instantaneous pressure and serious consequence occurs because of three-phase current, impedance unbalance, only can be used for star connection, and delta connection is inapplicable owing to there is not zero line.Electrical network for delta connection, custom-designed applicable three-phase resolution model is arranged, but this pattern using is striden phase line and is connected, and need to select higher withstand voltage components and parts with respect to star connection, therefore increases cost, increases failure rate, increases equipment volume weight etc.Simultaneously, the three-phase separate solution must just be designed at the beginning of product design in the whole system, can't be used in the not equipment of design power factor correction of the script that existed.Because three-phase is decomposed into multichannel carries out rectifying and wave-filtering, cause the subsequent conversion device or and then be divided into the multichannel conversion, and all press at output, the electric current and voltage of the synthetic design of current-sharing, the direct current that perhaps the multichannel rectifying and wave-filtering is produced carries out resupplying the conversion process that the next stage circuit carries out necessity after the current-sharing, all can bring multichannel all to press current-sharing, prevent the problem that single channel is unloaded or transship, also just mean the decline of reliability, antijamming capability, stability.Use LC power-factor compensation method relative reliability higher, can append or add during in new product designs at existing equipment, but the LC compensation model exists that equipment is heavy, compensation is switched and had the unfavorable factors such as impulse current, surge voltage.Existing circumscribed active filter must adopt independently power supply, and this power supply must be enough large in order to support the compensating movement of back, and this power supply equally also can produce harmonic current and emc issue; After detecting the line current harmonic wave, can (inject reverse current when electric current is bigger than normal with pulse mode to the circuit Injection Current from power supply independently, inject forward current when electric current is less than normal), Injection Current namely is that size is identical, the line harmonic electric current of single spin-echo; Because compensation is to inject to electrical network with pulse mode, certainly will produce serious electromagnetic interference, add that the time difference of compensation produces difference frequency, so that electromagnetic compatibility problem is very outstanding.
Summary of the invention
The objective of the invention is provides a kind of simple in structure for overcoming the deficiency of above-mentioned existing harmonic wave control circuit, and little, the effective harmonic wave transfer type three phase harmonic of loss is administered circuit.
The present invention adopts technical scheme to be; One end of the impedance protection inductor that each serial connection of the output of three phase network is corresponding, each connects three inputs of corresponding three phase full bridge current rectifying and wave filtering circuit the other end of impedance protection inductor; 6 identical device for power switching are connected separately and are connected in parallel between three inputs of impedance protection inductor and three phase full bridge current rectifying and wave filtering circuit behind the reverse protection diode, and each goes up device for power switching and the reverse protection diode of two series connection in parallel mutually; Each self-corresponding three current sensor respectively in parallel between the output of impedance protection inductor and three phase network, the output of current sensor connects respectively each self-corresponding band pass filter, the output of band pass filter accesses respectively the PWM module, the PWM module has 6 outputs, and these 6 outputs connect respectively the control end of 6 device for power switching; In the PWM module, each phase current harmonic signal is split into positive and negative two half cycles, independently controls separately respectively a pulse width modulator, and the output of 6 road pulse width modulators and the amplitude proportional signal of harmonic current with frequency drive 6 device for power switching; If wherein the harmonic current of a phase increases, then corresponding device for power switching conducting turns to other phase with harmonic current more than needed.
The invention has the beneficial effects as follows:
1, as long as modulator responses speed is selected suitably, the switching device power headroom is selected correctly, the present invention can adapt to the requirement of any power rank, any mains frequency.
2, because harmonic current is generally less than 50% of Fundamental-frequency Current; so the circuit that consists of with the present invention is less than three-phase decomposition mode power factor correction circuit loss in the switching device loss; and the protection of the line impedance among the present invention inductor plays metering function but not the energy storage effect; so loss is little, overall efficiency is higher than three-phase resolution model.
3, because no matter harmonic current is big or small, as long as can be detected by CT, just can be shifted by switching device, so the present invention only has maximum harmonic current restriction, and do not have the minimum current restriction, thereby from whole circuit start, power factor (PF), harmonic current are namely controlled, for example can not occur under little electric current small-power under the active decomposition correction mode, proofreading and correct lost efficacy, harmonic current is excessive, and under the Passive LC pattern the large shortcoming of unloaded reactive current.
4, with respect to the circumscribed active filter, the present invention only needs a small-power accessory power supply that can satisfy the power device driving that power is very little, high-power accessory power supply that need not be extra, and cost is lower, and loss is lower.
5, because the operating current of power device is exactly harmonic current itself, so the present invention can not produce extra high-power interference source.
What use when 6, working owing to the present invention is analog sampling, simulation control, the centre does not have digital signal processing, short, the ageing height of time-delay is got rid of outside the information monitoring of the mechanical, electrical road of software switch, fully can not have processor, not have normally operation in the situation of software.
7, the present invention can be designed in the new product and use, and also can additionally be attached in the equipment that does not add Active PFC, to realize calibration result and anti-harmonic wave effect.
Description of drawings
Fig. 1 is the structure connection layout that harmonic wave transfer type three phase harmonic of the present invention is administered circuit.
Embodiment
As shown in Figure 1, connect into a common three phase full bridge current rectifying and wave filtering circuit by diode rectification full-bridge FWB, filter inductance L-4 and filter capacitor C1, this three phase full bridge current rectifying and wave filtering circuit is connected to the two ends of the R-load of load.
Identical line impedance corresponding to each serial connection of the output of three phase network protected the end of inductor L-1, L-2, L-3, and the other end of impedance protection inductor L-1, L-2, L-3 connects respectively three inputs of corresponding three phase full bridge current rectifying and wave filtering circuit.6 identical device for power switching Q1 ~ Q6 connect separately and are connected in parallel between three inputs of impedance protection inductor L-1, L-2, L-3 and three phase full bridge current rectifying and wave filtering circuit behind the anti-reverse protection diode D1 ~ D6.Each goes up device for power switching and the diode of two series connection in parallel mutually.Device for power switching Q1 ~ Q6 can be any device that meets withstand voltage, electric current, power, switching speed, for carrying driving, such as metal-oxide-semiconductor, IGBT, triode constant power device.Diode D1 ~ D6 is used for preventing that device for power switching from bearing reverse voltage and damaging.The effect of impedance protection inductor L-1, L-2, L-3 is the harmonic current of isolation outer net, and the harmonic current that prevents outer net is administered and caused power device Q1 ~ Q6 overload, and prevents alternate instantaneous short circuit.The High-frequency Interference of simultaneously buffer circuit generation prevents that Electro Magnetic Compatibility is deteriorated, and its design parameter then can be determined according to the needs of side circuit.Circuit between the output of impedance protection inductor L-1, L-2, L-3 and three phase network each self-corresponding three current sensor CT-1, CT-2 respectively in parallel, CT-3; be used for the harmonic current on the circuit on induction and the detection line, they are connected in parallel on induction line electric current on the circuit between three-phase line L-1, L-2, L-3 and the load.The output of three current sensor CT-1, CT-2, CT-3 connects respectively each self-corresponding harmonic current band pass filter F1, F2, F3, harmonic current band pass filter F1, F2, F3 can be Passive LC filter, ceramic filter, also can be to include but not limited to active filter with amplifier etc., do not limit its type and mode of operation, only need guarantee to possess high-order bandpass filtering performance, and guarantee that amplitude distortion degree in the frequency band, time-delay are as far as possible little.The output of band pass filter F1, F2, F3 accesses respectively the PWM module.The PWM module is a comprehensive function module, finish the control function, at least have 3 inputs and 6 outputs, the output of 3 input connecting band bandpass filter F1, F2, F3,6 outputs connect respectively the control end that meets respectively 6 device for power switching Q1 ~ Q6.
When the present invention worked, diode rectification full-bridge FWB, filter inductance L-4 and filter capacitor C1 provided direct current from impedance protection inductor L-1, L-2, the L-3 received current of correspondence and after finishing rectification, filtering for load R-load.At this moment, because the effect of diode rectification full-bridge FWB, filter inductance L-4 and filter capacitor C1, impedance protection inductor L-1, L-2, L3 rear end have produced harmonic current, and harmonic current mainly concentrates on 5 times, 7 times, 11 times, 13 times, 17 times, the inferior part that is higher than power frequency of n; This harmonic current and power current are collected by current sensor CT-1, CT-2, the CT-3 of three correspondences, and it is proportional to be converted into amplitude, the voltage signal that the frequency waveform is consistent.Three voltage signals that current sensor CT-1, CT-2, CT-3 export, after passing through respectively corresponding three band pass filter F1, F2, F3, power frequency partly is isolated, and the high-frequency signal that is higher than the power frequency certain multiple also is isolated, and only has the harmonic signal that must administer to pass through.The signal of three band pass filter F1, F2, F3 output is sent to the PWM module, in this PWM module, each phase current harmonic signal is split into positive and negative two half cycles, independently control separately respectively a pulse width modulator, so that 6 road pulse width modulators can be exported with harmonic current with the proportional signal of amplitude frequently.The signal of PWM module output, through amplifying, isolate 6 device for power switching Q1 ~ Q6 of rear drive, at this moment, and 6 device for power switching Q1 ~ Q6 conductings, the pulsewidth ratio is consistent with harmonic current, realizes that harmonic current is to the purpose of other phase transfer;
So-called harmonic current is appreciated that in fact the sine waveform at fundamental frequency increases or reduced some electric currents.Mutually as example, when A did not have electric current on mutually, current sensor CT-1 did not detect unusually take A, and corresponding band pass filter F1 does not have output yet, and the PWM module section can not given device for power switching Q1 ~ Q6 driving yet.After there was electric current in A mutually, current sensor CT-1 detected corresponding electric current and is converted into corresponding signal, after band pass filter F1 filtering, obtains the signal that frequency is higher than fundamental frequency, and this signal is converted into driving to device for power switching Q1 ~ Q6 by the PWM module.At this moment, if A phase harmonic current is increase tendency, then device for power switching Q1 conducting turns to B phase (if this moment, B phase current potential was lower than the A phase) with harmonic current more than needed, perhaps device for power switching Q6 conducting turns to C phase (if this moment, C phase current potential was lower than the A phase) with harmonic current more than needed.If this moment, A phase harmonic current reduced trend, then device for power switching Q4 conducting, from B harmonic current more than needed is turned to A phase (if this moment, B phase current potential was higher than the A phase), perhaps device for power switching Q5 conducting turns to C phase (if this moment, C phase current potential was higher than the A phase) with harmonic current more than needed.When design PWM module; manage to stagger conducting sequential to device for power switching Q1 ~ Q6 avoids 6 pipes of transient state all open-minded, in addition the limiting protecting of impedance protection inductor L-1, L-2, L-3; just can be effectively with harmonic current from each phase transfer to other phase, wherein energy can't lose.When the harmonic current in the loop disappeared or be very little, power factor (PF) just raise naturally, the in addition voltage delay effect of impedance protection inductor L-1, L-2, L-3, and through reasonably combined and calculating, power factor (PF) can reach 1.000 under the perfect condition.Only to being higher than fundamental frequency, the harmonic wave that is lower than setpoint frequency shifts in the present invention, and the actual flow overcurrent is less, and the loss that the switching device pressure drop causes is also very little.
Claims (1)
1. a harmonic wave transfer type three phase harmonic is administered circuit, an end of the impedance protection inductor that each serial connection of the output of three phase network is corresponding, and each connects three inputs of corresponding three phase full bridge current rectifying and wave filtering circuit the other end of impedance protection inductor; It is characterized in that: 6 identical device for power switching are connected separately and are connected in parallel between three inputs of impedance protection inductor and three phase full bridge current rectifying and wave filtering circuit behind the reverse protection diode, and each goes up device for power switching and the reverse protection diode of two series connection in parallel mutually; Each self-corresponding three current sensor respectively in parallel between the output of impedance protection inductor and three phase network, the output of current sensor connects respectively each self-corresponding band pass filter, the output of band pass filter accesses respectively the PWM module, the PWM module has 6 outputs, and these 6 outputs connect respectively the control end of 6 device for power switching; In the PWM module, each phase current harmonic signal is split into positive and negative two half cycles, independently controls separately respectively a pulse width modulator, and the output of 6 road pulse width modulators and the amplitude proportional signal of harmonic current with frequency drive 6 device for power switching; If wherein the harmonic current of a phase increases, then corresponding device for power switching conducting turns to other phase with harmonic current more than needed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105046642A CN102983571A (en) | 2012-12-03 | 2012-12-03 | Harmonic transfer type three-phase harmonic elimination circuit |
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| CN2012105046642A CN102983571A (en) | 2012-12-03 | 2012-12-03 | Harmonic transfer type three-phase harmonic elimination circuit |
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| CN102983571A true CN102983571A (en) | 2013-03-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703366A (en) * | 2016-04-25 | 2016-06-22 | 中国舰船研究设计中心 | Active filtration method and device for simultaneously restraining difference mode interference and common mode interference |
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| KR20090100221A (en) * | 2008-03-19 | 2009-09-23 | 한빛이디에스(주) | Method for controlling of module type three phase active filter |
| CN101651347A (en) * | 2009-09-18 | 2010-02-17 | 南京航空航天大学 | Parallel-connection type active power filter |
| CN201813163U (en) * | 2010-08-17 | 2011-04-27 | 南京航空航天大学 | Full-bridge parallel active power filter in single-phase and three-phase single-power tube bridge arm structures |
| CN203151094U (en) * | 2012-12-03 | 2013-08-21 | 江苏嘉钰新能源技术有限公司 | Harmonic transfer type three-phase harmonic elimination circuit |
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2012
- 2012-12-03 CN CN2012105046642A patent/CN102983571A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090100221A (en) * | 2008-03-19 | 2009-09-23 | 한빛이디에스(주) | Method for controlling of module type three phase active filter |
| CN101651347A (en) * | 2009-09-18 | 2010-02-17 | 南京航空航天大学 | Parallel-connection type active power filter |
| CN201813163U (en) * | 2010-08-17 | 2011-04-27 | 南京航空航天大学 | Full-bridge parallel active power filter in single-phase and three-phase single-power tube bridge arm structures |
| CN203151094U (en) * | 2012-12-03 | 2013-08-21 | 江苏嘉钰新能源技术有限公司 | Harmonic transfer type three-phase harmonic elimination circuit |
Non-Patent Citations (1)
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| 王林等: "基于三相线电流平衡化的三相不平衡补偿技术研究", 《中国水运》, vol. 12, no. 10, 31 October 2012 (2012-10-31), pages 85 - 86 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703366A (en) * | 2016-04-25 | 2016-06-22 | 中国舰船研究设计中心 | Active filtration method and device for simultaneously restraining difference mode interference and common mode interference |
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Application publication date: 20130320 |