CN204376406U - A kind of active harmonic control device - Google Patents
A kind of active harmonic control device Download PDFInfo
- Publication number
- CN204376406U CN204376406U CN201420451962.4U CN201420451962U CN204376406U CN 204376406 U CN204376406 U CN 204376406U CN 201420451962 U CN201420451962 U CN 201420451962U CN 204376406 U CN204376406 U CN 204376406U
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- circuit
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- control device
- harmonic
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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
-
- 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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- Control Of Electrical Variables (AREA)
Abstract
The utility model discloses a kind of active harmonic control device, this active harmonic control device comprises: the instruction current computing circuit detecting the harmonic and reactive currents component in compensating load electric current and the command signal of offset current drawn according to instruction current computing circuit, produce the offset current circuit for generating of actual offset current, offset current circuit for generating comprises: main circuit, drive circuit and current follow-up control circuit.The beneficial effects of the utility model are: achieve dynamic compensation, and the harmonic wave that all can change frequency and size and the idle of change compensate, and the change of target compensation are had to the response be exceedingly fast; Can simultaneously to harmonic wave with idlely to compensate, and the large I of compensating reactive power accomplishes continuous adjustment; Impact by electric network impedance is little, is not easy and electric network impedance generation resonance; The change of energy Tracking Frequency of Power Grids, therefore compensation performance is by the impact of electrical network frequency change.
Description
Technical field
The utility model relates to the technical field of electric product, refers more particularly to a kind of active harmonic control device.
Background technology
Along with the extensive use of power electronic equipment, a large amount of harmonic waves is injected into electrical network, causes the quality of power supply of whole electrical network to go from bad to worse.In electrical network, the harm of harmonic current is mainly reflected in the following aspects:
Harmonic wave to make in electrical network equipment produces additional harmonic loss, reduces the service efficiency of electrical network, transmission of electricity and power consumption equipment, increases grid line loss.
Harmonic wave can produce extra thermal effect, thus causes power consumption equipment to generate heat, and makes its ageing of insulation, reduces the useful life of equipment.In independent minor scale power net, harmonic current also can make transformer, generator etc. produce supplementary load loss and heating, causes mechanical oscillation and noise, greatly strengthens electric equipment heating loss, accelerates ageing of insulation, affects equipment life; Also can damage because kelvin effect causes rotor top layer overheated time serious.
Harmonic wave easily makes, between electrical network and compensation condenser, resonance occurs, and makes amplified harmonic current several times even decades of times, not only makes capacitor directly impaired, and increases the weight of the threat to other electric equipment.This shows particularly evident in independent minor scale power net, because its line voltage frequency fluctuation scope is larger, so just more easily causes resonance.
Harmonic wave can cause some proterctive equipment misoperations, as relay, fuse etc., electrical measuring instrument also can be caused to measure inaccurate simultaneously.In the class isolated power network of oil field, harmonic wave likely affects the normal work in whole oil field to the error in dipping that logging causes.
Harmonic wave can produce interference to neighbouring communication system, and the lighter introduces noise, and reduce speech quality, severe one causes dropout, and communication system cannot normally be worked.
There is following shortcoming in present market major harmonic device: the resonance frequency of single tuned filter can change because of the deviation of electric capacity, inductance parameters or change, mains frequency has certain fluctuation, this will cause filter off resonance, electric network impedance change has considerable influence to the filter effect of single tuned filter, more seriously, electric network impedance and filter have the possibility that parallel resonance occurs.
Utility model content
For the problem in correlation technique, the utility model proposes a kind of active harmonic control device, the operating efficiency of slide rail type noodle slicing robot can be improved.
The technical solution of the utility model is achieved in that
According to an aspect of the present utility model, provide a kind of active harmonic control device, this active harmonic control device is arranged between AC power and load, and comprise: the instruction current computing circuit detecting the harmonic and reactive currents component in compensating load electric current and the command signal of offset current drawn according to described instruction current computing circuit, produce the offset current circuit for generating of actual offset current, described offset current circuit for generating comprises: main circuit, drive circuit and current follow-up control circuit, wherein, the output of described current follow-up control circuit is connected with the input of described drive circuit, output and the described main circuit of described drive circuit are connected and are connected with the output of described AC power afterwards, and the input of described instruction current computing circuit is connected with the input of described load, the output of described instruction current computing circuit is connected with the input of described current follow-up control circuit.
Preferably, described main circuit comprises: circuit breaker, the A.C. contactor of connecting with described circuit breaker, the inlet wire inductance of connecting with described A.C. contactor, also comprise pulse width modulation current transformer, electrochemical capacitor and filter capacitor, wherein, connect with described inlet wire inductance after described pulse width modulation current transformer and electrochemical capacitor parallel connection.
Preferably, described instruction current computing circuit comprises complex programmable logic device (CPLD), DSP single-chip microcomputer and D/A change-over circuit, the FPDP of described CPLD is connected with the FPDP of described DSP single-chip microcomputer, the signal port of described CPLD is connected with described D/A change-over circuit respectively with the signal port of described DSP single-chip microcomputer, and described D/A change-over circuit is connected with described current follow-up control circuit.
Preferably, described CPLD is also connected with protection and I/O circuit.
The beneficial effects of the utility model are: achieve dynamic compensation, and the harmonic wave that all can change frequency and size and the idle of change compensate, and the change of target compensation are had to the response be exceedingly fast; Can simultaneously to harmonic wave with idlely to compensate, and the large I of compensating reactive power accomplishes continuous adjustment; Energy storage unit is not needed during compensating reactive power; During compensation harmonic, required energy storage unit capacity is also little; Even if target compensation electric current is excessive, active power filter also can not transship, and normally can play compensating action; Impact by electric network impedance is little, is not easy and electric network impedance generation resonance; The change of energy Tracking Frequency of Power Grids, therefore compensation performance is by the impact of electrical network frequency change; Both can to a harmonic wave and reactive source separate compensation, also can to multiple harmonic wave and reactive source centralized compensation.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the active harmonic control device according to the utility model embodiment;
Fig. 2 is the circuit block diagram of the instruction current computing circuit according to the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of the utility model protection.
As depicted in figs. 1 and 2, present embodiments provide a kind of active harmonic control device, this active harmonic control device is arranged between AC power and load, and comprise: the instruction current computing circuit detecting the harmonic and reactive currents component in compensating load electric current and the command signal of offset current drawn according to described instruction current computing circuit, produce the offset current circuit for generating of actual offset current, described offset current circuit for generating comprises: main circuit, drive circuit and current follow-up control circuit, wherein, the output of described current follow-up control circuit is connected with the input of described drive circuit, output and the described main circuit of described drive circuit are connected and are connected with the output of described AC power afterwards, and the input of described instruction current computing circuit is connected with the input of described load, the output of described instruction current computing circuit is connected with the input of described current follow-up control circuit.
Continue with reference to figure 1, main circuit wherein comprises: circuit breaker, the A.C. contactor of connecting with described circuit breaker, the inlet wire inductance of connecting with described A.C. contactor, also comprise pulse width modulation current transformer, electrochemical capacitor and filter capacitor, wherein, connect with described inlet wire inductance after described pulse width modulation current transformer and electrochemical capacitor parallel connection.Pulse width modulation current transformer wherein referred to as PWM converter, be utilize the numeral of microprocessor to export the very effective technology of one controlled analog circuit, be widely used in from measure, the power that communicates control with conversion many fields.
Concrete, as shown in Figure 2, described instruction current computing circuit comprises complex programmable logic device (CPLD), DSP single-chip microcomputer and D/A change-over circuit, the FPDP of described CPLD is connected with the FPDP of described DSP single-chip microcomputer, the signal port of described CPLD is connected with described D/A change-over circuit respectively with the signal port of described DSP single-chip microcomputer, and described D/A change-over circuit is connected with described current follow-up control circuit.CPLD (Complex Programmable Logic Device) wherein, CPLD, be from PAL and GAL device development device out, scale is large comparatively speaking, and complex structure, belongs to large scale integrated circuit scope.The digital integrated circuit of be a kind of user according to needing separately constitutive logic function voluntarily.
Preferably, described CPLD is also connected with protection and I/O circuit.Improve the security performance of whole circuit.
Composition graphs 1, the active harmonic control device that this enforcement provides operationally, first instruction current computing circuit detects harmonic wave in load input current iL (i.e. target compensation electric current) and the current component such as idle, obtain concrete offset current component ic ', and by this Signal transmissions to current follow-up control circuit, current follow-up control circuit sends control signal through calculating and changing backward drive circuit, drive circuit drives PWM converter action in main circuit, produce actual offset current ic, superposition is compensated to the current i s that AC power exports, finally obtain desirable load input current iL.Because instruction current computing circuit is monitored load input current iL, is detected incessantly all the time, as long as so at any time there is load input current iL harmonic excess, at once by compensation corrigendum, will reach and remain that load input current iL is the object of desirable electric current.
Can be found out by foregoing description, the active harmonic control device that this enforcement provides achieves dynamic compensation, and the harmonic wave that all can change frequency and size and the idle of change compensate, and the change of target compensation are had to the response be exceedingly fast; Can simultaneously to harmonic wave with idlely to compensate, and the large I of compensating reactive power accomplishes continuous adjustment; Energy storage unit is not needed during compensating reactive power; During compensation harmonic, required energy storage unit capacity is also little; Even if target compensation electric current is excessive, active power filter also can not transship, and normally can play compensating action; Impact by electric network impedance is little, is not easy and electric network impedance generation resonance; The change of energy Tracking Frequency of Power Grids, therefore compensation performance is by the impact of electrical network frequency change; Both can to a harmonic wave and reactive source separate compensation, also can to multiple harmonic wave and reactive source centralized compensation.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1. an active harmonic control device, be arranged between AC power and load, it is characterized in that, comprise: the instruction current computing circuit detecting the harmonic and reactive currents component in compensating load electric current and the command signal of offset current drawn according to described instruction current computing circuit, produce the offset current circuit for generating of actual offset current, described offset current circuit for generating comprises: main circuit, drive circuit and current follow-up control circuit, wherein, the output of described current follow-up control circuit is connected with the input of described drive circuit, output and the described main circuit of described drive circuit are connected and are connected with the output of described AC power afterwards, and the input of described instruction current computing circuit is connected with the input of described load, the output of described instruction current computing circuit is connected with the input of described current follow-up control circuit.
2. active harmonic control device according to claim 1, it is characterized in that, described main circuit comprises: circuit breaker, the A.C. contactor of connecting with described circuit breaker, the inlet wire inductance of connecting with described A.C. contactor, also comprise pulse width modulation current transformer, electrochemical capacitor and filter capacitor, wherein, connect with described inlet wire inductance after described pulse width modulation current transformer and electrochemical capacitor parallel connection.
3. active harmonic control device according to claim 2, it is characterized in that, described instruction current computing circuit comprises complex programmable logic device (CPLD), DSP single-chip microcomputer and D/A change-over circuit, the FPDP of described CPLD is connected with the FPDP of described DSP single-chip microcomputer, the signal port of described CPLD is connected with described D/A change-over circuit respectively with the signal port of described DSP single-chip microcomputer, and described D/A change-over circuit is connected with described current follow-up control circuit.
4. active harmonic control device according to claim 3, is characterized in that, described CPLD is also connected with protection and I/O circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420451962.4U CN204376406U (en) | 2014-08-12 | 2014-08-12 | A kind of active harmonic control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420451962.4U CN204376406U (en) | 2014-08-12 | 2014-08-12 | A kind of active harmonic control device |
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| Publication Number | Publication Date |
|---|---|
| CN204376406U true CN204376406U (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420451962.4U Expired - Fee Related CN204376406U (en) | 2014-08-12 | 2014-08-12 | A kind of active harmonic control device |
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| CN (1) | CN204376406U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135004A (en) * | 2014-08-12 | 2014-11-05 | 四川威德能源科技有限公司 | Active harmonic management device |
-
2014
- 2014-08-12 CN CN201420451962.4U patent/CN204376406U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135004A (en) * | 2014-08-12 | 2014-11-05 | 四川威德能源科技有限公司 | Active harmonic management device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20150812 |
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| EXPY | Termination of patent right or utility model |