CN204947596U - A kind of active power filter of outdoor type band Reactive Power Dispatch function - Google Patents
A kind of active power filter of outdoor type band Reactive Power Dispatch function Download PDFInfo
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- CN204947596U CN204947596U CN201520544329.4U CN201520544329U CN204947596U CN 204947596 U CN204947596 U CN 204947596U CN 201520544329 U CN201520544329 U CN 201520544329U CN 204947596 U CN204947596 U CN 204947596U
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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 utility model relates to a kind of active power filter of outdoor type band Reactive Power Dispatch function, be connected between electrical network and load, comprise current transformer, harmonic wave extractor, fundamental reactive component extractor, harmonic wave comparator, central processing unit, PWM wave producer and inverter, described current transformer connects load respectively, harmonic wave extractor and fundamental reactive component extractor, described fundamental reactive component extractor connects harmonic wave comparator, described harmonic wave extractor and harmonic ratio comparatively device are all connected central processing unit, described central processing unit connects PWM wave producer, described PWM wave producer connects inverter, described inverter connects electrical network.Compared with prior art, the utility model have easy for installation, cost is very low, flexible configuration is changeable, repair and maintenance is convenient, operate the advantages such as directly perceived.
Description
Technical field
The utility model relates to a kind of active power filter, especially relates to a kind of active power filter of outdoor type band Reactive Power Dispatch function.
Background technology
Along with development and the progress of economic technology, electrical network scale constantly increases, and a large amount of inductive load access electrical networks, causes the power factor of electrical network to continue on the low side.Especially in 10kV transmission line, there is the flowing of a large amount of reactive currents, cause very large transmission losses.The harmonic wave that nonlinear-load causes brings serious negative effect equally, particularly along with the fast development of power electronic technology, the application that various power electronic equipment is increasingly extensive in generating, transmission of electricity, distribution and using electricity system, harmonic wave, idle pollution that it brings electrical network are also serious gradually.Simultaneously along with the progress of social informatization, the extensive use of sensitiveness load (as computer control system, sophisticated electronics etc.), it is also proposed higher requirement to the quality of power supply.
Utility model content
The purpose of this utility model is exactly provide a kind of active power filter of outdoor type band Reactive Power Dispatch function to overcome defect that above-mentioned prior art exists, have easy for installation, cost is very low, flexible configuration is changeable, repair and maintenance is convenient, operate the advantages such as directly perceived.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of active power filter of outdoor type band Reactive Power Dispatch function, be connected between electrical network and load, comprise current transformer, harmonic wave extractor, fundamental reactive component extractor, harmonic wave comparator, central processing unit, PWM wave producer and inverter, described current transformer connects load respectively, harmonic wave extractor and fundamental reactive component extractor, described fundamental reactive component extractor connects harmonic wave comparator, described harmonic wave extractor and harmonic ratio comparatively device are all connected central processing unit, described central processing unit connects PWM wave producer, described PWM wave producer connects inverter, described inverter connects electrical network.
Described central processing unit is connected with the wireless launcher with host computer wireless connections.
Described central processing unit is ARM+DSP dual core processor.
Described harmonic wave extractor, fundamental reactive component extractor, harmonic wave comparator are single-chip microcomputer.
Described current transformer connects harmonic wave extractor by data collecting card, and described current transformer connects fundamental reactive component extractor by data collecting card.
Described inverter adopts the three-phase full-bridge inverting circuit be made up of IGBT.
Also comprise the LCDs and control button that connect central processing unit.
Also comprise housing, this active power filter is installed in housing by screw, is provided with Air cooler and louvre in described housing.
Compared with prior art, the utility model has the following advantages:
1) in elimination system, can also reactive power compensation scheduling be carried out while harmonic wave, fundamentally improve the quality of power supply of circuit, reduce line loss, improve power supply reliability and the economic benefit of electrical network.
2) increase harmonic wave comparator, when load harmonic is not bery serious, then only can need compensate First Harmonic Reactive Power, reduce power consumption while ensureing filter effect, flexible configuration is changeable, and ARM+DSP dual core processor ensures that data processing is precisely quick.
3) adopt housing console mode integral structure, being applied to open air, is outdoor type equipment, remote monitoring is realized by wireless launcher, have easy for installation, cost is very low, repair and maintenance advantage easily, configures LCDs and control button simultaneously, operation is directly perceived.
Accompanying drawing explanation
Fig. 1 is the utility model general structure schematic diagram.
In figure: 1, current transformer, 2, harmonic wave extractor, 3, fundamental reactive component extractor, 4, harmonic wave comparator, 5, central processing unit, 6, PWM wave producer, 7, inverter, 8, electrical network, 9, load.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.The present embodiment is implemented premised on technical solutions of the utility model, give detailed execution mode and concrete operating process, but protection range of the present utility model is not limited to following embodiment.
As shown in Figure 1, a kind of active power filter of outdoor type band Reactive Power Dispatch function, be connected between electrical network 8 and load 9, this load 9 is nonlinear load, comprise current transformer 1, harmonic wave extractor 2, fundamental reactive component extractor 3, harmonic wave comparator 4, central processing unit 5, PWM wave producer 5 and inverter 7, current transformer 1 connects load 9 respectively, harmonic wave extractor 2 and fundamental reactive component extractor 3, fundamental reactive component extractor 3 connects harmonic wave comparator 4, harmonic wave extractor 2 and harmonic ratio comparatively device 4 are all connected central processing unit 5, central processing unit 5 connects PWM wave producer 5, PWM wave producer 5 connects inverter 7, inverter 7 connects electrical network 8.
Wherein, central processing unit 5 is connected with the wireless launcher with host computer wireless connections, and minimizing is connected up and real-time is good.
Central processing unit 5 is ARM+DSP dual core processor, and this ARM+DSP dual core processor treatment effeciency is high, can long-time stable work.Harmonic wave extractor 2, fundamental reactive component extractor 3, harmonic wave comparator 4 all adopt single-chip microcomputer.Inverter 7 adopts the three-phase full-bridge inverting circuit be made up of IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor).Current transformer 1 connects harmonic wave extractor 2 by data collecting card, and current transformer 1 connects fundamental reactive component extractor 3 by data collecting card, and data collecting card realizes analog-to-digital conversion function.
Central processing unit 5 is connected with LCDs and control button, and LCDs is convenient to display working condition intuitively, and control button comprises unlatching, cuts out and the input etc. of set point.
This active power filter is installed in housing by screw, is provided with Air cooler and louvre in housing, and thermal diffusivity is good.
In figure, i
lfor momentary load electric current, i
sfor transient power supply current, i
cfor Active Power Filter-APF injects the offset current of electrical network 8.According to Kirchhoff's current law (KCL), have: i
s=i
l+ i
c.Owing to containing fundametal compoment and harmonic component in momentary load electric current, momentary load electric current is several to be expressed as: i
l=i
lf+ i
lh, wherein i
lffor the fundametal compoment i of momentary load electric current
lhfor momentary load current harmonics component.If again by momentary load current i
lfundametal compoment resolve into instantaneous active component i
lpfwith instantaneous reactive component i
lqf, then momentary load electric current can be expressed as: i
l=i
lpf+ i
lqf+ i
lh.
If during the harmonic current needing compensating load 9 to produce, the instruction current computing circuit of Active Power Filter-APF detects and calculates the harmonic component of momentary load electric current, using the command signal as offset current after its reversed polarity, the offset current produced by offset current circuit for generating, this offset current and the harmonic component equal and opposite in direction in momentary load electric current, direction are contrary, cancel each other with the harmonic component in momentary load electric current, make only not contain harmonic wave containing the fundametal compoment of load current in source current.So just reach the object eliminating harmonic wave in source current.
If require active power filter while compensation harmonic electric current, go back the reactive power of compensating load 9, as long as then increase the composition with the fundamental reactive component reversed polarity of momentary load electric current in the command signal of offset current.Like this, the humorous idle component that involves in offset current and load current offsets, and source current equals the fundamental active component of load current.
If load harmonic is not bery serious, then only can need compensate First Harmonic Reactive Power.
Operation principle:
1) this device can compensate the harmonic wave that load-side nonlinear-load produces, and improving the system side quality of power supply, is the generation that owner avoids electric power to impose a fine.Load current is detected by current transformer 1, and the harmonic component extracted by harmonic wave extractor 2 in load current, the number of times of harmonic component is 2 ~ 50 times, when harmonic wave comparator 4 judges that harmonic component is higher or lower than set point, then central controller sends harmonic compensation instruction, produce pwm signal by PWM wave producer 5 and send to the inner IGBT of inverter 7, control inverter 7 produces one and load harmonic current equal and opposite in direction, the contrary pulse current injectingt in direction, in electrical network 8, reaches the object of filtering.
2) load current is by extracting harmonic component, then extract fundamental reactive component by fundamental reactive component extractor 3 to central processing unit 5 simultaneously, fundamental reactive component compensating instruction is sent to central processing unit 5, central processing unit 5 control inverter 7 exports offset current, needs the current canceling such as harmonic wave and fundamental reactive component compensated in this offset current and load current
Therefore, the basic functional principle of this compensation arrangement can be sketched and be: the electric current detecting target compensation, calculate the command signal of offset current, this signal draws offset current through amplifying, what will compensate in offset current and load current humorously involves the current cancelings such as idle, finally makes source current become the sine wave of expectation.And according to different needs, different functions can be realized.
Claims (8)
1. the active power filter of an outdoor type band Reactive Power Dispatch function, be connected between electrical network (8) and load (9), it is characterized in that, comprise current transformer (1), harmonic wave extractor (2), fundamental reactive component extractor (3), harmonic wave comparator (4), central processing unit (5), PWM wave producer (6) and inverter (7), described current transformer (1) connects load (9) respectively, harmonic wave extractor (2) and fundamental reactive component extractor (3), described fundamental reactive component extractor (3) connects harmonic wave comparator (4), described harmonic wave extractor (2) and harmonic ratio comparatively device (4) are all connected central processing unit (5), described central processing unit (5) connects PWM wave producer (6), described PWM wave producer (6) connects inverter (7), described inverter (7) connects electrical network (8).
2. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, it is characterized in that, described central processing unit (5) is connected with the wireless launcher with host computer wireless connections.
3. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, it is characterized in that, described central processing unit (5) is ARM+DSP dual core processor.
4. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, it is characterized in that, described harmonic wave extractor (2), fundamental reactive component extractor (3), harmonic wave comparator (4) are single-chip microcomputer.
5. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, it is characterized in that, described current transformer (1) connects harmonic wave extractor (2) by data collecting card, and described current transformer (1) connects fundamental reactive component extractor (3) by data collecting card.
6. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, it is characterized in that, described inverter (7) adopts the three-phase full-bridge inverting circuit be made up of IGBT.
7. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, is characterized in that, also comprises the LCDs and control button that connect central processing unit (5).
8. the active power filter of a kind of outdoor type band Reactive Power Dispatch function according to claim 1, it is characterized in that, also comprise housing, this active power filter is installed in housing by screw, is provided with Air cooler and louvre in described housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520544329.4U CN204947596U (en) | 2015-07-24 | 2015-07-24 | A kind of active power filter of outdoor type band Reactive Power Dispatch function |
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|---|---|---|---|
| CN201520544329.4U CN204947596U (en) | 2015-07-24 | 2015-07-24 | A kind of active power filter of outdoor type band Reactive Power Dispatch function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460065A (en) * | 2019-08-20 | 2019-11-15 | 中煤新集能源股份有限公司 | Flameproof and intrinsically safe static reactive generator device and the implementation method of reactive compensation |
-
2015
- 2015-07-24 CN CN201520544329.4U patent/CN204947596U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460065A (en) * | 2019-08-20 | 2019-11-15 | 中煤新集能源股份有限公司 | Flameproof and intrinsically safe static reactive generator device and the implementation method of reactive compensation |
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