CN205407263U - Idle comprehensive compensation ware of single -phase active electric power harmonic - Google Patents
Idle comprehensive compensation ware of single -phase active electric power harmonic Download PDFInfo
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- CN205407263U CN205407263U CN201620150234.9U CN201620150234U CN205407263U CN 205407263 U CN205407263 U CN 205407263U CN 201620150234 U CN201620150234 U CN 201620150234U CN 205407263 U CN205407263 U CN 205407263U
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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
Idle comprehensive compensation ware of single -phase active electric power harmonic, relate to electric energy quality technical field, including the command current arithmetic circuit with by electric current tracking control circuit, the offset current generator that drive circuit and main circuit are constituteed, the initiative way includes a bridge arm of being established ties and being constituteed by two IGBT, another bridge arm of establishing ties and constituteing by two one -way electric capacity, two bridge arms constitute a return circuit, tell the one end that the reactor is connected to first branch road in the middle of two IGBT, tell the second branch road in the middle of two one -way electric capacity, the other end of second branch road is equipped with the wiring end continuous with the zero line of electric wire netting. The utility model discloses an insulated -gate bipolar transistor is the power device, has improved and has detected harmonic and idle detection speed, controls simplyr, and it is easier to realize, has practiced thrift the cost greatly.
Description
Technical field
This utility model relates to quality of power supply technical field, is specifically related to harmonic wave control and the reactive power compensation technology field of electrical network.
Background technology
Fast development along with modern industrial technology, in network system, nonlinear-load sharply increases, all kinds of nonlinear power electronic equipments such as inverter, commutator and various Switching Power Supplies etc. are widely applied so that harmonic wave and reactive power cause people more and more to pay close attention to；Further, supplier of electricity and power system device, user and various electrical equipment are also more and more higher to the requirement of the quality of power supply.So the harmonic wave control of network system to have been become an urgent demand of modern electric production development with reactive-load compensation.
The existing method proposing to adopt compensator that electrical network is carried out harmonic wave control compensation in existing industry, but, the main circuit of the compensation of its execution adopts four IGBT to form full-bridge bridge arm type loop, and also electric capacity need to be set at the two ends of brachium pontis, meanwhile, the output signal adopting phaselocked loop is also needed to participate in instruction current computing circuit.The efficiency of this compensation way is low, compensation effect is unsatisfactory, and the aberration rate entering the network wave before load also has 7.14%.
Therefore at present most APF harmonic detection algorithms are loaded down with trivial details, all need phaselocked loop, and structure all exists the phenomenon of complexity, redundancy, and main circuit is relatively costly.
Utility model content
This utility model purpose be propose a kind of simple, efficiently, the single-phase active electric-power harmonic wave Reactive-current General Compensation device of low cost.
This utility model includes instruction current computing circuit and compensating current generator, described compensating current generator is made up of current follow-up control circuit, drive circuit and main circuit, the outfan of described instruction current computing circuit connects the input of current follow-up control circuit, the outfan of described current follow-up control circuit connects the input of drive circuit, and the outfan of described drive circuit connects the input of main circuit；Active road includes the brachium pontis being composed in series by two IGBT, another brachium pontis being composed in series by two one-way capacitors, two brachium pontis constitute a loop, one end of the first branch road linked reactor is separated in the middle of said two IGBT, the other end of described reactor is provided with the terminals that the phase with electrical network is connected, the second branch road is separated in the middle of said two one-way capacitor, the other end of described second branch road is provided with the terminals that the zero line with electrical network is connected, two outer ends of two one-way capacitors of series connection arrange the main circuit voltage signal sampling terminals of instruction current computing circuit.
This utility model does not need electrical network phaselocked loop, and adopting insulated gate bipolar transistor (IGBT) is power device, and also adopts one group of IGBT less, designs a kind of reliable, efficiently, and the single-phase active electric-power filter that cost performance is high.Use the easiest harmonic wave algorithm, selected recursive discrete Fourier transformation algorithm to extract harmonic wave with idle, greatly reduced the operand of microcontroller, improve detection harmonic wave and idle detection rates.Meanwhile, saving phaselocked loop, relatively other control methods, control simpler, it is achieved be more prone to.Main circuit adopts dot structure in single-phase capacitance, saves two IGBT than traditional full bridge structure, is greatly saved cost, improves cost performance.
Accompanying drawing explanation
Fig. 1 is the one application schematic diagram of the present invention.
Fig. 2 be provided without compensatory device enter the network wave figure before load.
Fig. 3 is the network wave Fourier analysis result before the entrance load of Fig. 2.
Fig. 4 is the network wave figure before the entrance load after adopting prior art to compensate.
Fig. 5 is the network wave Fourier analysis result before the entrance load of Fig. 4.
Fig. 6 is the network wave figure before the entrance load after adopting the present invention to compensate.
Fig. 7 is the network wave Fourier analysis result before the entrance load of Fig. 6.
Detailed description of the invention
One, structure and working principle of the present utility model:
As it is shown in figure 1, this utility model is provided with instruction current computing circuit 1 and compensating current generator two parts, compensating current generator is made up of current follow-up control circuit 2, drive circuit 3 and 4 three parts of main circuit.
The core of instruction current computing circuit 1 is to detect that harmonic wave in target compensation electric current and the electric current such as idle divide, therefore sometimes referred to as wave superposition circuit.The principle Analysis of instruction current computing circuit 1:
Assume the periodic signal that the cycle is T, it is denoted as series of harmonic component sum:
(1)
Wherein, NmFor the highest frequency overtone order of required consideration, AkAnd BkThe respectively real part of kth order harmonic components and imaginary part,For first-harmonic angular frequency.N is the hits in each primitive period, the sampling period。
For fundametal compoment, its real part and imaginary part can be calculated by following formula:
(2)
By formula (2) it can be seen that real part and imaginary part in order to calculate current time fundametal compoment, it is necessary to utilizing the input signal N number of sampled value within a nearest primitive period, carry out n times multiplication and additive operation, operand is very big.But by observation type (2), it has been found that it can with represented by the form of following recurrence:
(3)
Real part and the imaginary part of fundametal compoment can be calculated easily, thus being synthetically derived fundametal compoment according to following formula according to formula (3):(4)
Fundametal compoment can be obtained according to formula (4), wherein comprise fundamental active and fundamental wave reactive power, here the idle object being also us and compensating, therefore fundamental active should be separated, observation type (4) we can obtainFor fundamental reactive component,For fundamental active component.It is hereby achieved that the fundamental active component of electric current, original signal and fundamental active signal subtraction, it is idle and harmonic signal
(5)
In formula (5),For harmonic wave.
It is derived from from above formula (1): only need formula (5) just can realize compensation operation.In formula (5)Produced by line voltage, it is not necessary to electrical network phaselocked loop, it is not necessary to produced by microcontroller, save the time resource of microcontroller, the phase-locked error of microcontroller will not be produced, and follow the frequency fluctuation of voltage and automatically adjust.
The effect of compensating current generator is the command signal compensating electric current drawn according to instruction current computing, by current follow-up control drives drive circuit, so that main circuit produces actual compensation electric current.
The outfan of instruction current computing circuit 1 connects the input of current follow-up control circuit 2, and the outfan of current follow-up control circuit 2 connects the input of drive circuit 3, and the outfan of drive circuit 3 connects the input of main circuit 4.
Actively road 4 is by two IGBT(V1、V2), two one-way capacitor (C1、C2) and reactor (L) composition, V1And V2The brachium pontis being composed in series, C1And C2Being composed in series another brachium pontis, two brachium pontis constitute a loop, at V1And V2Centre separates one end of the first branch road linked reactor L, and the other end of reactor L is connected with a phase of electrical network by binding post, C1And C2Centre separates the second branch road, and the other end of the second branch road is connected with the zero line of electrical network by binding post, the C of series connection1And C2Two outer ends the main circuit voltage signal U of instruction current computing circuit is setCSampling terminals.
Instruction current computing circuit 1 is additionally provided with the power network current signal is and mains voltage signal e being connected with electrical networkaIncoming end.
Utility model works principle: current follow-up control circuit is to compensate first link in current occuring circuit, work is according to compensating the command signal of electric current and the actual mutual relation compensated between electric current, drawing the pwm signal of each device of main circuit in control and compensation current occuring circuit, the result of control should ensure that compensation its command signal of current tracking change.Adopt time-controlled instantaneous value manner of comparison.
Two, relative analysis:
With identical load, respectively the network wave figure before the entrance load after being provided without compensatory device, adopting prior art to compensate afterwards and adopt the present invention to compensate is tested, obtain the figure oscillogram of Fig. 2,4,6 respectively, in each figure, abscissa is timeline units is the second (s), and vertical coordinate is current unit is ampere (A).
Comparison diagram 2,4,6 is visible: the network wave figure before load that enters after adopting the present invention to compensate is better than the network wave figure entered before load after adopting prior art to compensate, after adopting prior art to compensate enter load before network wave figure be better than being provided without the network wave figure entered before load of compensatory device.
Meanwhile, respectively Fig. 2,4,6 being adopted Fourier analysis, result is shown in Fig. 3,5,7 respectively.In Fig. 3,5,7, Fundamental is first-harmonic, and the THD meaning is aberration rate, and the Hz meaning is hertz.
As seen from Figure 3: the fundametal compoment of load waveform is 50Hz, being sized to 79.9A, the aberration rate of load waveform is 28.55%.
As seen from Figure 5: the fundametal compoment of load waveform is 50Hz, being sized to 78.03A, the aberration rate of load waveform is 8.76%.
As seen from Figure 7: the fundametal compoment of load waveform is 50Hz, being sized to 70.22A, aberration rate is 3.89%.
Comparison diagram 3,5,7 is visible: adopting this utility model device, the aberration rate of the network wave before load can be reduced to 3.89%.
Claims (1)
1. single-phase active electric-power harmonic wave Reactive-current General Compensation device, including instruction current computing circuit and compensating current generator, described compensating current generator is made up of current follow-up control circuit, drive circuit and main circuit, the outfan of described instruction current computing circuit connects the input of current follow-up control circuit, the outfan of described current follow-up control circuit connects the input of drive circuit, and the outfan of described drive circuit connects the input of main circuit；It is characterized in that: active road includes the brachium pontis being composed in series by two IGBT, another brachium pontis being composed in series by two one-way capacitors, two brachium pontis constitute a loop, one end of the first branch road linked reactor is separated in the middle of said two IGBT, the other end of described reactor is provided with the terminals that the phase with electrical network is connected, the second branch road is separated in the middle of said two one-way capacitor, the other end of described second branch road is provided with the terminals that the zero line with electrical network is connected, two outer ends of two one-way capacitors of series connection arrange the main circuit voltage signal sampling terminals of instruction current computing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620150234.9U CN205407263U (en) | 2016-02-29 | 2016-02-29 | Idle comprehensive compensation ware of single -phase active electric power harmonic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620150234.9U CN205407263U (en) | 2016-02-29 | 2016-02-29 | Idle comprehensive compensation ware of single -phase active electric power harmonic |
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| CN205407263U true CN205407263U (en) | 2016-07-27 |
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| CN201620150234.9U Expired - Fee Related CN205407263U (en) | 2016-02-29 | 2016-02-29 | Idle comprehensive compensation ware of single -phase active electric power harmonic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834537A (en) * | 2017-10-11 | 2018-03-23 | 深圳供电局有限公司 | Zero static difference current tracking control method and control system |
-
2016
- 2016-02-29 CN CN201620150234.9U patent/CN205407263U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834537A (en) * | 2017-10-11 | 2018-03-23 | 深圳供电局有限公司 | Zero static difference current tracking control method and control system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20190228 |