CN205051351U - Active electric power filter - Google Patents
Active electric power filter Download PDFInfo
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- CN205051351U CN205051351U CN201520712799.7U CN201520712799U CN205051351U CN 205051351 U CN205051351 U CN 205051351U CN 201520712799 U CN201520712799 U CN 201520712799U CN 205051351 U CN205051351 U CN 205051351U
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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
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model relates to an active filter, this wave filter including the gradation detection module that connects gradually, concentrate electric current loop controller, PWM modulation module and dc -to -ac converter, gradation detection module, concentrated electric current loop controller, PWM modulation module and dc -to -ac converter adopt split type modularized design. The utility model discloses the system Dynamics response speed that can overcome the FFT mode is slow, based on bandwidth problem and the simple technological compensation precision problem that exists of appointed time harmonic current detection that adopts that the harmonic detection technique of instantaneous idle theory exists, can reduce equipment cost again, lift system's stability.
Description
Technical field
The utility model relates to electronic filter technical field, particularly a kind of active electric power filter.
Background technology
At present, Active Power Filter-APF is mainly divided into from the angle of Harmonic currents detection: based on FFT(FastFourierTransformation, fast fourier transform) harmonic current inspection, the Harmonic currents detection based on Instantaneous Power Theory and the APF(Activepowerfilter without Harmonic currents detection, Active Power Filter-APF).On this basis, for specific occasion, have scholar to propose the algorithm of specifying subharmonic to eliminate, gradation Instantaneous Power Theory being extended to each harmonic detects, and then superposition obtains total harmonic current.Harmonic current finally obtains vector modulation current signal by current controller, enters PWM and obtains corresponding switching tube drive singal, and delivered on power switch pipe corresponding to inverter.
Although subharmonic electric current loop independently controls the compensation precision that can improve APF, amount of calculation and the delay of controller can be increased, reduce the dynamic responding speed of system, simultaneously, when needing the harmonic number of filtering more, very high to the hardware requirement of single control chip, the cost of meeting increasing device; Or adopt multiple control chip to carry out Collaborative Control, while increasing cost, owing to relating to the synchronous of multiple CPU, the stability of system can be reduced.
Harmonic currents detection part: (1), according to the mode of FFT, can detect each harmonic, but the response time needing a cycle, reduce the dynamic responding speed of system to a great extent, and require higher to controller.(2) based on the Harmonic currents detection technology of Instantaneous Power Theory, can directly obtain whole harmonic currents, response speed is very fast, but just can only control together all harmonic waves like this, and the restriction of bandwidth can affect APF harmonic compensation precision.(3) according to the appointment subharmonic current detection technique based on Instantaneous Power Theory, all need when detecting every subharmonic current to carry out twice coordinate transform, when selected harmonic number is more, very high to the requirement of controller, or adopt multi-CPU Collaborative Control, increase cost and the stability of reduction system.By the control chip of existing market main flow, on the basis considering cost, if select the harmonic number of filtering too much, be difficult to meet the demands, thus often select the harmonic number can chosen when specifying subharmonic filtering to be generally no more than 6 in practical application.
Utility model content
Main purpose of the present utility model is, for above-mentioned deficiency of the prior art, a kind of active electric power filter is provided, its can overcome the system dynamic responding speed of FFT mode slow, based on Instantaneous Power Theory harmonic detecting technique existing for bandwidth problem and adopt the compensation precision problem of specifying existing for subharmonic current detection technique merely, equipment cost can be reduced again, the stability of elevator system.
For achieving the above object, the utility model by the following technical solutions.
The utility model provides a kind of Active Power Filter-APF, comprise the gradation detection module connected successively, concentrate current loop controller, PWM module and inverter, described gradation detection module needs to set the harmonic number of filtering according to the actual requirements in setting module and carries out the detection of appointments subharmonic current, described concentrated current loop controller receives described harmonic current, and carry out segmented centralized control according to the actual requirements, to eliminate the static difference that different harmonic frequency is brought, described PWM module regulates the pulsewidth of harmonic current, described impulse waveform current conversion is become to need the harmonic current compensated by described inverter, and described gradation detection module, concentrate current loop controller, PWM module and inverter adopt Split moduleization design.
In above-mentioned filter, set section according to the actual requirements, a gradation detection module and a concentrated current loop controller are set respectively in each interval.
In above-mentioned filter, described PWM module and inverter by the gradation detection module of all sections and concentrated current loop controller share.
In above-mentioned filter, a PWM module and an inverter are set respectively in each interval, and the gradation detection module in each interval, concentrated current loop controller, PWM module are connected successively with inverter.
Compared to conventional filter, the utility model has the following advantages:
(1), while guaranteed output exports, the higher compensation precision of quality of power supply product and dynamic responding speed is realized with same cost;
(2) the hardware designs difficulty of modules is reduced;
(3) the Software for Design difficulty of modules is reduced;
(4) improve the stability of quality of power supply product complete machine;
(5) be convenient to quality of power supply product promote to wider filter range.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of Active Power Filter-APF in an embodiment of the present utility model.
Fig. 2 is the structured flowchart of Active Power Filter-APF in another embodiment of the present utility model.
Fig. 3 is the theory diagram of specifying subharmonic detection method in the utility model embodiment.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Below with reference to drawings and the specific embodiments describe in detail the technical solution of the utility model so as clearer, understand invention essence of the present utility model intuitively.
The present embodiment provides a kind of active filter, can be used for, in electric power system or other quality of power supply product, being mainly used in filtering multiple harmonic and carrying out active compensation.
The Active Power Filter-APF of the present embodiment mainly comprises:
Gradation detection module 10, concentrated current loop controller 20, PWM module 30 and inverter 40, this gradation detection module 10, concentrated current loop controller 20, PWM module 30 and inverter 40 adopt Split moduleization to design.
Wherein, gradation detection module 10 is for needing to set the harmonic number of filtering and carrying out the detection of appointments subharmonic current in setting module according to the actual requirements.
Concentrate current loop controller 20 for receiving harmonic current, and carry out segmented centralized control according to the actual requirements, to eliminate the static difference that different harmonic frequency is brought.
PWM module 30 is for regulating the pulsewidth of harmonic current.
Inverter 40 is for becoming to need the harmonic current compensated by impulse waveform current conversion.
In actual applications; usually the fine degree of section can be set according to the actual requirements; and a gradation detection module 10 and a concentrated current loop controller 20 are set respectively in each interval; focus on so that in real time the harmonic current detected is sent into concentrate in current loop controller 20, effectively ensure that real-time and the accuracy of filtering.
In addition, PWM module 30 and inverter 40 can by the gradation detection module 10 of all sections and concentrated current loop controller 20 share (as shown in Figure 1), also a PWM module 30 and an inverter 40 can be set respectively in each interval, and the gradation detection module 10 in each interval, concentrated current loop controller 20, PWM module 30 are connected (as shown in Figure 2) successively with inverter 40.Certainly, in other embodiment of the utility model, the interval embodiment of PWM module 30 and inverter 40 can also have other form, will not enumerate herein.
After adopting said structure design, employing following steps are carried out filtering compensation to power circuit:
S10: the three-phase current gathering load-side;
S20: obtain the electric current under fundamental frequency rotating coordinate system by coordinate transform, adopts the appointment subharmonic penalty method based on Instantaneous Power Theory to carry out sectional, gradation compensation to harmonic wave;
S30: by current loop controller in offset current successively input set and PWM module, to convert impulse waveform electric current to;
S40: utilize and drive inverter to become to need the harmonic current compensated by impulse waveform current conversion.
Step S10 is specially such as:
Set harmonic number according to the actual requirements and carry out specifying the detection of subharmonic.
Step S20 is specially such as:
After the change anglec of rotation and transformation matrix of coordinates obtain individual harmonic current, select the required harmonic current number of times compensated, be then added the harmonic current that just can obtain needing compensation.
Step S30 is specially such as:
The number of times of the harmonic current that the interval set according to the actual requirements comprises, adopt and calculate based on the appointment subharmonic algorithm of Instantaneous Power Theory this few subharmonic current that this interval comprises, after the harmonic current in each interval is superposed separately, deliver in the concentrated current loop controller in interval corresponding with it, obtain the instruction harmonic current that modules exports, then drive inverter to export the required harmonic current compensated by the PWM module pulse signal obtaining corresponding to this module corresponding to each power switch pipe of inverter.
With reference to shown in Fig. 3, current transformer gathers the three-phase current of load-side, obtains the current i under frequency rotating coordinate system corresponding to appointment subharmonic by coordinate transform
pnand i
qn, as the formula (1).
（1）
By i
pn, i
qnthrough LPF(LowPassFilter, low pass filter) after obtain specifying subharmonic current i through anti-coordinate transform again
an, i
bn, i
cn, as the formula (2).
（2）
Like this, when carrying out harmonic current computing, selecting the harmonic current number of times that will compensate, then performing add operation, just can obtain the harmonic current total amount of corresponding number of times.
In order to improve the compensation precision of system, the concentrated current loop controller 20 of the present embodiment can autonomous sectional, can determine sectional fineness according to the actual demand at scene.The control device of different control effects can be chosen according to demand, comprise various conventional controller, as PI controller or fuzzy controller etc.
Then, by current loop controller 20 in above-mentioned offset current successively input set and PWM module 30, impulse waveform electric current is converted thereof into.Then drive inverter 40 to export the required harmonic current compensated by this pulse signal, finally realize accurate harmonic compensation effect.
Compare complete time penalty method, the present embodiment adopts specifies the subharmonic detection method change anglec of rotation and transformation matrix of coordinates to obtain individual harmonic current.Such as, think elimination n-th subharmonic, because phase three-wire three circuit does not exist neutral harmonic current, only according to the positive and negative sequence of selected harmonic wave, rotational coordinates matrix need be made into formula (3):
（3）
Wherein, as n=3k-1, being positive sequence harmonic, as n=3k+1, is Negative sequence harmonic.
The PWM module of the present embodiment can be any pulse width modulation mode, such as SPWM, SVPWM, SHEPWM etc.
Meanwhile, the inverter 40 of the present embodiment can be any inverter topology, as multi-electrical level inverters such as 2 flat inversion topologicals or diode clamp type, cascade, striding capacitance types.
In sum, the utility model can overcome the system dynamic responding speed of FFT mode slow, based on Instantaneous Power Theory harmonic detecting technique existing for bandwidth problem and adopt the compensation precision problem of specifying existing for subharmonic current detection technique merely, equipment cost can be reduced again, the stability of elevator system.
The foregoing is only preferred embodiment of the present utility model; not thereby its scope of the claims is limited; every equivalent structure transformation utilizing the utility model specification and accompanying drawing content to do; directly or indirectly be used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. an Active Power Filter-APF, it is characterized in that, comprise the gradation detection module connected successively, concentrate current loop controller, PWM module and inverter, described gradation detection module needs to set the harmonic number of filtering according to the actual requirements in setting module and carries out the detection of appointments subharmonic current, described concentrated current loop controller receives described harmonic current, and carry out segmented centralized control according to the actual requirements, to eliminate the static difference that different harmonic frequency is brought, described PWM module regulates the pulsewidth of harmonic current, described impulse waveform current conversion is become to need the harmonic current compensated by described inverter, and described gradation detection module, concentrate current loop controller, PWM module and inverter adopt Split moduleization design.
2. Active Power Filter-APF as claimed in claim 1, is characterized in that, set section according to the actual requirements, arrange a gradation detection module and a concentrated current loop controller in each interval respectively.
3. Active Power Filter-APF as claimed in claim 2, is characterized in that, described PWM module and inverter by the gradation detection module of all sections and concentrated current loop controller share.
4. Active Power Filter-APF as claimed in claim 2, it is characterized in that, a PWM module and an inverter are set respectively in each interval, and the gradation detection module in each interval, concentrated current loop controller, PWM module are connected successively with inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520712799.7U CN205051351U (en) | 2015-09-15 | 2015-09-15 | Active electric power filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520712799.7U CN205051351U (en) | 2015-09-15 | 2015-09-15 | Active electric power filter |
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| CN205051351U true CN205051351U (en) | 2016-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800135A (en) * | 2017-06-21 | 2018-03-13 | 中南大学 | A kind of different subharmonic for SAPF become more meticulous compensation method |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800135A (en) * | 2017-06-21 | 2018-03-13 | 中南大学 | A kind of different subharmonic for SAPF become more meticulous compensation method |
| CN107800135B (en) * | 2017-06-21 | 2021-04-23 | 中南大学 | Different-order harmonic refinement compensation method for SAPF |
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