CN104377947A - Frequency converter harmonic wave elimination method and frequency converter harmonic wave elimination device - Google Patents
Frequency converter harmonic wave elimination method and frequency converter harmonic wave elimination device Download PDFInfo
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- CN104377947A CN104377947A CN201410755220.5A CN201410755220A CN104377947A CN 104377947 A CN104377947 A CN 104377947A CN 201410755220 A CN201410755220 A CN 201410755220A CN 104377947 A CN104377947 A CN 104377947A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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Abstract
The invention relates to a frequency converter harmonic wave elimination method and a frequency converter harmonic wave elimination device. The frequency converter harmonic wave elimination device is characterized in that a reactor is connected to the input end or the output end of a frequency converter, the output end of the frequency converter is connected with a sampling unit, the analysis unit is connected with the sampling unit and a dynamic control unit, the dynamic control unit is connected with a delay output unit and an inverter unit of the frequency converter, and the delay output unit is connected with the inverter unit of the frequency converter and the output end of the frequency converter. The frequency converter harmonic wave elimination method and the frequency converter harmonic wave elimination device have the advantages that harmonic waves generated inside the frequency converter are detected in real time and output effect delay is controlled dynamically after part of harmonic waves are generated while the reactor is added in the frequency converter; as the device is different from an existing active filter, the intrinsic inverter unit of the frequency converter is used for generating the harmonic waves for counteracting harmful harmonic waves according to the method, so that the active filter is simplified structurally greatly; total elimination quantity of the harmonic waves is above 70%, and the device is much lower in cost than the existing active filter and is remarkable in harmful harmonic wave elimination effect.
Description
Technical field
The present invention relates to a kind of method and apparatus of frequency converter harmonic carcellation, be a kind of for frequency converter produce the administering method of harmonic wave and the device according to this method design.
Background technology
Frequency change speed regulator for motor can produce a large amount of harmonic wave in the course of the work, and these harmonic waves can reduce the operating efficiency of frequency converter, also can disturb the electronic equipment of surrounding simultaneously, makes it normally work.As in the process of adjustment frequency converter, need to use various electronic instrument, but the humorous wave interference that frequency converter produces, when not adding any protection, often make these electronic equipments be difficult to normal work, and then make the adjustment of frequency converter also become difficulty.And the harmonic wave that some energy that frequency converter produces are larger, can on motor, producing contrary moment, result be counteract a part due to moment, reduce the service efficiency of motor.
The oiling of existing harmonic wave control mode has two kinds, and one adopts filter reactor, and filter reactor has two spindles, is tied with winding coil, absorbs harmonic wave and is converted into the form of heat energy, approximately can filtering harmonic content 30%, cost is lower, is widely adopted.Although this mode price bed material but to administer the effect of harmonic wave not very good, the harmonic wave of about 30% can only be eliminated.Another kind of mode active filter.The principle of active filter is: the harmonic wave produced for harmonic source, manufactures size identical, and the contrary harmonic wave in direction offsets with it, approximately can filtering harmonic wave more than 90%.This harmonic wave control mode, technically more complicated, usually will arrange specially and offset the harmonic source of harmonic wave, also must arrange special analytical system, to analyze the various parameters of harmonic wave so that manufacture can with the harmonic wave of its counteracting.Due to technical sophistication, structure is also very complicated, and cost is high, is difficult to be widely accepted.
Summary of the invention
In order to overcome the problem of prior art, the present invention proposes a kind of method and apparatus of frequency converter harmonic carcellation.Described method and apparatus is equipped with a kind of generating device of frequency converter self that utilizes by reactor and produces contrary harmonic wave of offsetting relative to harmonic wave, thus reduces unwanted harmonics to the impact of frequency converter operating efficiency.
The object of the present invention is achieved like this: a kind of method of frequency converter harmonic carcellation, comprises the steps:
The step that reactance is eliminated: use reactor to eliminate the fractional harmonic of inverter output terminal;
The step of sampling: the primary harmonic wave sent at frequency converter detection frequency converter;
The step analyzed: analyze the primary harmonic wave received, the content of analysis comprises: peak value, mean value, amplitude, phase place;
Formulate the step of harmonic carcellation scheme: generate the best scheme eliminating primary harmonic wave according to analysis result;
Produce the step of spontaneous harmonic wave: utilize frequency converter itself to produce the spontaneous harmonic wave contrary with primary harmonic direction;
The step offset: at the next cycle of the primary humorous wave period be sampled by spontaneous harmonic wave to inverter output terminal, primary harmonic wave and spontaneous harmonic wave are cancelled out each other.
Further, described " step of analysis " also comprises: the result analyzed stored, and uses in " formulating the step of harmonic carcellation scheme ".
A kind of device using the frequency converter harmonic carcellation of said method, comprise: at input or the output linked reactor of frequency converter, the output of described frequency converter connects sampling unit, described sampling unit is connected with analytic unit, described analytic unit is connected with dynamic control unit, described dynamic control unit is connected with the inversion unit of time delay output unit, frequency converter, the inversion unit of described frequency converter is connected with described time delay output unit, and described time delay output unit is connected with the output of frequency converter.
Further, described analytic unit linkage record unit, described record cell is connected with dynamic control unit.
The beneficial effect that the present invention produces is: the present invention adopts active power filtering and passive filtering to combine principle, add reactor in frequency converter while, adopt the principle of active power filtering, detect the harmonic wave that frequency converter inside produces in real time, after Dynamic controlling fractional harmonic produces, output action postpones.Utilize the inversion unit of frequency converter itself to generate the harmonic wave of offsetting with unwanted harmonics with existing active filter unlike, described method, enormously simplify active filter formation.The harmonic wave cancel themselves that described method makes load inside produce, counteracting amount 40% ~ 50%, adds 30% of reactor filtering, and harmonic wave is removed total amount and reached more than 70%, and the relatively existing active filter of the cost of described device is much lower, administer the unwanted harmonics successful that frequency converter produces.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the flow chart of method described in embodiments of the invention one;
Fig. 2 is the theory diagram of device described in embodiments of the invention three;
Fig. 3 is the theory diagram of device described in embodiments of the invention four.
Embodiment
Embodiment one:
The present embodiment is a kind of method of frequency converter harmonic carcellation, and flow process as shown in Figure 1.
The present embodiment, on the harmonic wave control of frequency converter output motor electric current, have employed original technology.By carrying out real-time sampling to motor three-phase current, and Fourier analysis is carried out to sample rate current, be decomposed into first-harmonic and each harmonic, and align Negative sequence harmonic respectively and compensate from output waveform of transformer, thus reach reduced harmonic action effect, reduce the object of energy consumption of electrical machinery.Under normal circumstances, the sinusoidal waveform that frequency converter can send matching carrys out drive motors rotation, when being positive benchmark with power frequency 50Hz, 5 subharmonic (3n-1 time) are defined as Negative sequence harmonic, namely its magnetic field rotation direction produced in motor is contrary with first-harmonic, and the turning moment of generation is also contrary with the moment that first-harmonic produces.In order to weaken and even offset this opposing torque, the artificial control frequency converter of the present embodiment sends 5 positive sequence harmonics (defining first-harmonic for negative benchmark in control algolithm), be superimposed upon on normal sinusoidal output waveform, offset the moment of 5 Negative sequence harmonic generations.Like this, what frequency converter finally sent will be a nonsinusoidal waveform.Certainly, 5 positive sequence harmonics of new superposition can produce new harmonic wave again, but due to the current amplitude of 5 subharmonic own limited, its harmonic wave (its 5 subharmonic is 25 subharmonic relative to first-harmonic) produced, current amplitude will be lower, substantially can ignore, and need not consider its impact produced.In like manner, other each harmonic also with reference to this mode, can superpose by frequency converter the counteracting that output reverse harmonic wave carries out moment.The number of times of the final harmonic torque that can offset is subject to the restriction of frequency converter switching device switching frequency, and under present condition, the harmonic torque of less than 30 times can be balanced out by this mode.Like this, output to the impact of pulsation that current waveform on motor will no longer be subject to causing because of harmonic wave, run smooth steady more safe and reliable, and motor efficiency is improved, energy consumption reduces, thus reaches the object of saves energy.
Described in the present embodiment, the concrete steps of method comprise:
The step that reactance is eliminated: use reactor to eliminate the fractional harmonic of inverter output terminal.Reactor can be connected on the output of frequency converter, also can be connected on input.Reactor is used to be a kind of foolproof harmonic carcellation method.The price of reactor is also cheaper, and just the effect of harmonic carcellation is poor, can only eliminate the harmonic wave of 30%.However, reactor harmonic carcellation is used still to be worth.
The step of sampling: the primary harmonic wave sent at frequency converter detection frequency converter.Sampling is the various characteristics in order to analyze harmonic wave.Sampling can detect the curtage that frequency converter exports, and sampling adopts the mode of inductance, or uses the mode etc. of capacitance-resistance.
The step analyzed: analyze the primary harmonic wave received, the content of analysis comprises: peak value, mean value, amplitude, phase place.Described primary harmonic wave is the harmonic wave that frequency converter itself produces, and is a kind of unwanted harmonics.Due to the present embodiment improvement is the harmonic wave produced for frequency converter itself, and these harmonic waves produce in rectification and reversals due to frequency converter, have certain regularity.But the rule that the not all frequency converter of this rule is all followed, only has and carries out dynamic analysis to each concrete frequency converter, just can obtain.All right special setting data storehouse, carries out record by the result of analysis.These analysis results can be analyzed from higher aspect on the one hand, can also utilize these records, compare analysis, modify to the program to the scheme of the primary harmonic wave of the elimination that will generate, the scheme of the primary harmonic wave of the elimination that optimization is better.After having certain grasp to the working law of a frequency converter, the scheme of the several ready-made harmonic carcellation of database establishment can be utilized for subsequent use.The scheme using these for subsequent use can reduce the time of analytical calculation, improves the utilance of resource.
Formulate the step of harmonic carcellation scheme: generate the best scheme eliminating primary harmonic wave according to analysis result.By analysis, having be familiar with more accurately primary harmonic wave, such as: the phase sequence of primary harmonic wave, is positive sequence harmonic, or Negative sequence harmonic, size, amplitude etc.Formulate the scheme of administering primary harmonic wave thus.
Produce the step of spontaneous harmonic wave: utilize frequency converter itself to produce the spontaneous harmonic wave contrary with primary harmonic direction.The feature of the present embodiment is this step: be not that a special generation harmonic wave goes to offset primary harmonic wave, but utilize the inverter of frequency converter itself, produce a harmonic wave, be called spontaneous harmonic wave.The large small magnitude of this spontaneous harmonic wave and phase sequence are determined according to the primary harmonic wave scheme of improvement.
The step offset: at the next cycle of the primary humorous wave period be sampled by spontaneous harmonic wave to inverter output terminal, primary harmonic wave and spontaneous harmonic wave are cancelled out each other.Spontaneous harmonic wave and primary harmonic wave are cancelled out each other the waveform produced, and the waveform that namely frequency converter exports not is being sinusoidal wave, but the waveform having some to be out of shape.Described next cycle, refers to the one-period below of the primary harmonic period be sampled, therefore, above-mentioned steps all will the next cycle after employing come before make, just effectively can eliminate the effect of primary harmonic wave.
Embodiment two:
The present embodiment is the improvement of embodiment one, is the refinement of embodiment one about " step of analysis "." step of analysis " described in the present embodiment also comprises: the result analyzed stored, and uses in " formulating the step of harmonic carcellation scheme ".
The object of the present embodiment sets up the database that stores mass data, these data carried out higher level analysis, the harmonic wave rule of such as each frequency converter, a variety of causes of generation, the feature etc. of appearance.Utilize these data, more effectively can administer the harmonic wave that frequency converter produces.Can arrange less storage device in each frequency converter, its data of download of timing, are stored in large-scale database for subsequent use.
Embodiment three:
The present embodiment is a kind of device using the frequency converter harmonic carcellation of method described in above-described embodiment, and structure as shown in Figure 1.The present embodiment comprises: at input or the output linked reactor of frequency converter, the output of described frequency converter connects sampling unit, described sampling unit is connected with analytic unit, described analytic unit is connected with dynamic control unit, described dynamic control unit is connected with the inversion unit of time delay output unit, frequency converter, the inversion unit of described frequency converter is connected with described time delay output unit, and described time delay output unit is connected with the output of frequency converter.
The present embodiment is divided into two parts, and one is the part of passive harmonic carcellation, and a part is the part of active harmonic carcellation.Passive part is reactor.The digital processing system that active part is is core with digital processing chip group.The center of this system is process chip, and this process chip can use DSP, or similar process chip, as: MPU, MCU etc.Analytic unit, Dynamic controlling, time delay output unit are set in this digital processing system, to process various signal and to control.
Described sampling unit can be inductance sampling element, also can be capacitance-resistance sampling element etc.
The primary harmonic wave that analytic unit is used for obtaining is analyzed.To the analysis of harmonic wave by current sample (first-harmonic+harmonic wave), completed by single-chip microcomputer and relative program circuit.Drive the inversion unit of frequency converter to produce contrary harmonic wave by dynamic control unit again, offset when condition meets, this cover process completes very soon at the Shi Jian Nao of 1 millisecond.If frequency converter is six arteries and veins products (input 6 arteries and veins rectifier bridges), then harmonic wave is 6K+/-1, and this is the rule of frequency converter, but the harmonic content of the frequency converter of different capacity is different.
Dynamic control unit analysis result produces the scheme offsetting primary harmonic wave, recycles this scheme and drives the inversion unit of frequency converter to produce spontaneous harmonic wave, and control the spontaneous harmonic wave of the in good time output of time delay output unit, to offset primary harmonic wave.
The spontaneous harmonic wave that inversion unit produces by time delay output unit, under the control of dynamic control unit, the output of frequency converter is returned in good time transmission, offsets primary harmonic wave.
Embodiment four:
The present embodiment is the improvement of embodiment three, is the refinement of embodiment three about analytic unit.Analytic unit linkage record unit described in the present embodiment, described record cell is connected with dynamic control unit, as shown in Figure 3.
The present embodiment by linkage record unit on analytic unit, and produces the function of the various harmonic parameters of record frequency converter.Record cell can use various memory, as flash memory, and ROM etc.Store data namely can control in real time, also can be applied to analysis afterwards.
Finally it should be noted that, below only in order to technical scheme of the present invention to be described and unrestricted, although with reference to preferred arrangement scheme to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention the annexation etc. of unit (in the sequencing of such as step, the device) or equivalently to replace, and not departing from the spirit and scope of technical solution of the present invention.
Claims (4)
1. a method for frequency converter harmonic carcellation, comprises the steps:
The step that reactance is eliminated: use reactor to eliminate the fractional harmonic of inverter output terminal;
It is characterized in that:
The step of sampling: the primary harmonic wave sent at frequency converter detection frequency converter;
The step analyzed: analyze the primary harmonic wave received, the content of analysis comprises: peak value, mean value, amplitude, phase place;
Formulate the step of harmonic carcellation scheme: generate the best scheme eliminating primary harmonic wave according to analysis result;
Produce the step of spontaneous harmonic wave: utilize frequency converter itself to produce the spontaneous harmonic wave contrary with primary harmonic direction;
The step offset: at the next cycle of the primary humorous wave period be sampled by spontaneous harmonic wave to inverter output terminal, primary harmonic wave and spontaneous harmonic wave are cancelled out each other.
2. method according to claim 1, is characterized in that, described " step of analysis " also comprises: the result analyzed stored, and uses in " formulating the step of harmonic carcellation scheme ".
3. one kind uses the device of the frequency converter harmonic carcellation of method described in claim 1, comprise: at input or the output linked reactor of frequency converter, it is characterized in that, the output of described frequency converter connects sampling unit, described sampling unit is connected with analytic unit, described analytic unit is connected with dynamic control unit, described dynamic control unit is connected with the inversion unit of time delay output unit, frequency converter, the inversion unit of described frequency converter is connected with described time delay output unit, and described time delay output unit is connected with the output of frequency converter.
4. device according to claim 3, is characterized in that, described analytic unit linkage record unit, described record cell is connected with dynamic control unit.
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| CN201410755220.5A CN104377947B (en) | 2014-12-11 | 2014-12-11 | Frequency converter harmonic wave elimination method and frequency converter harmonic wave elimination device |
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| CN201410755220.5A CN104377947B (en) | 2014-12-11 | 2014-12-11 | Frequency converter harmonic wave elimination method and frequency converter harmonic wave elimination device |
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| CN104377947A true CN104377947A (en) | 2015-02-25 |
| CN104377947B CN104377947B (en) | 2017-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655735A (en) * | 2016-11-03 | 2017-05-10 | 广东明阳龙源电力电子有限公司 | Low-frequency control method based on modular multi-level converter device |
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| JPH08275538A (en) * | 1995-03-28 | 1996-10-18 | Matsushita Electric Works Ltd | Power supply |
| CN101055993A (en) * | 2007-03-09 | 2007-10-17 | 张云一 | Power network harmonic wave management method and device |
| CN101540510A (en) * | 2008-03-17 | 2009-09-23 | 北京能高自动化技术有限公司 | Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system |
| CN201797317U (en) * | 2010-06-09 | 2011-04-13 | 盘锦陆海兴业石油装备有限公司 | Power grid harmonic suppression device |
| CN102684513A (en) * | 2011-03-16 | 2012-09-19 | 力博特公司 | Uninterruptible power supply and rectifying circuit of uninterruptible power supply |
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2014
- 2014-12-11 CN CN201410755220.5A patent/CN104377947B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08275538A (en) * | 1995-03-28 | 1996-10-18 | Matsushita Electric Works Ltd | Power supply |
| CN101055993A (en) * | 2007-03-09 | 2007-10-17 | 张云一 | Power network harmonic wave management method and device |
| CN101540510A (en) * | 2008-03-17 | 2009-09-23 | 北京能高自动化技术有限公司 | Method for eliminating secondary pulsation interference on middle DC side in two-stage grid-connected system |
| CN201797317U (en) * | 2010-06-09 | 2011-04-13 | 盘锦陆海兴业石油装备有限公司 | Power grid harmonic suppression device |
| CN102684513A (en) * | 2011-03-16 | 2012-09-19 | 力博特公司 | Uninterruptible power supply and rectifying circuit of uninterruptible power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106655735A (en) * | 2016-11-03 | 2017-05-10 | 广东明阳龙源电力电子有限公司 | Low-frequency control method based on modular multi-level converter device |
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