CN107732915A - A kind of simplify control method of parallel connection type active electric filter - Google Patents
A kind of simplify control method of parallel connection type active electric filter Download PDFInfo
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- CN107732915A CN107732915A CN201710999432.1A CN201710999432A CN107732915A CN 107732915 A CN107732915 A CN 107732915A CN 201710999432 A CN201710999432 A CN 201710999432A CN 107732915 A CN107732915 A CN 107732915A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a kind of simplify control method of parallel connection type active electric filter, the difference of DC side reference voltage and capacitance voltage is input to PI controllers first, threephase load current signal is gathered by current transformer, convert to obtain the load current under dq axles by abc/dq, obtain loading fundamental current by low pass filter again, and the d axle fundamental currents are adjusted, the load fundamental current after adjustment is by dq/adc conversion threephase load fundamental current outputs；The difference of the output and power network current is input to current controller；SVPWM drive modules are sent into the output of current controller, are produced thermal compensation signal so as to produce switching signal control three-phase full-bridge inverter, are realized tracking of the power network current to load fundamental current, realize harmonic compensation indirectly.
Description
Technical field
The invention belongs to field of power electronics, and in particular to a kind of simplify control side of parallel connection type active electric filter
Method.
Background technology
With the extensive use of nonlinear load, the harmonic pollution problems in power system are on the rise.Traditional harmonic wave
Suppressing method has been difficult to the needs for meeting modern power systems, and Active Power Filter-APF (APF) fills as new harmonic compensation
Put and receive extensive concern.
Traditional Active Power Filter focus is consistently placed at the control to load harmonic, and proposes many humorous
The control method of ripple detection algorithm and harmonic current.But because the quality of harmonic detecting method can significantly affect active electric power
The compensation effect of wave filter, and to realize that the control to load harmonic current is also a big difficult point.Although such as Hysteresis control
Realize that simply dynamic response is good, but it is the shortcomings that it is very serious that switching frequency is not fixed, and certain some scholars propose fixed frequency
The hysteresis control method thereof of rate, but mostly in the presence of control load, the realistic problem being difficult to；Cascade ratio resonance control for another example
System, because nonlinear load is mostly Rectified DC load, therefore harmonic current number is mainly 6k ± 1 time, therefore passes through level the United Nations General Assembly
Amount resonant controller is to realize the compensation to harmonic wave, but the higher resonant controller for needing to cascade of control accuracy is just corresponding more,
And the more requirements for digital processing unit of resonant controller cascaded are higher, realize more difficult；Furthermore also deposited in practical application
In the harmonic current of other numbers, therefore cascade ratio resonant controller is also difficult to good compensation harmonic electric current.Direct harmonic wave
Also the problem of so mostly be present in current control mode.
The content of the invention
Based on above-mentioned technical problem, the present invention proposes a kind of simplify control method of parallel connection type active electric filter,
Harmonic current need not be detected, directly power network current is controlled, realizes that simple, precision is high, cost is low.
For achieving the above object, specific implementation of the invention is as follows：
A kind of simplify control method of parallel connection type active electric filter, comprises the following steps：
Step 1), by contrasting DC side reference voltageWith electric capacity virtual voltage Vdc, both differences are input to PI
Controller, make virtual voltage VdcReal-time tracking reference voltageThe output of DC side PI controllersWith the d of load current
Axle active componentIt is added；
Step 2), the threephase load current signal that current transformer collects convert by abc/dq, obtain dq and synchronously revolve
Turn the current component i under coordinate systemLdAnd iLq, iLdAnd iLqThe fundametal compoment of load current is obtained by low pass filter LPFWithWhereinWith the output of PI controllers in step 1)It is added as the d axle fundametal compoments after adjustment Do not adjust
Directly as q axle fundametal compoments WithConverted by dq/adc, obtain threephase load fundamental currentThe electric current and electricity
Net electric current iSkCompare, difference is input to current controller；Wherein k=a, b, c；
Step 3), current controller realize that power network current tracks to the zero steady-state error of threephase load fundamental current；
Step 4), SVPWM drive modules produce the drive signal of three-phase full-bridge inverter, and three-phase full-bridge inverter is driving
The filtered inductance of thermal compensation signal is produced in the presence of signal to be connected to the grid, and realizes harmonic current compensation.
Further, the transmission function of step 1) the PI controllers is：Wherein KpFor proportionality coefficient, KiFor product
Divide coefficient.
Further, the transmission function of current controller is in the step 3)Wherein KPFor proportionality coefficient,
KIFor integral coefficient, ω0For fundamental wave angular frequency.
Further, the current controller is ratio plural number integral controller.
The beneficial effects of the invention are as follows：
The simplify control method of a kind of parallel connection type active electric filter proposed by the present invention, by extracting threephase load base
Ripple electric current simultaneously controls three phase network electric current, makes three phase network current tracking threephase load fundamental current, thus makes three phase network electric
Stream keeps sinusoidal, realizes harmonic compensation indirectly.Compared to traditional control method, this invention simplifies control strategy, reduces
The complexity of system so that the compensation performance of Active Power Filter-APF is no longer influenceed by harmonic detecting and tracking, therefore system
Precision be improved, compensation effect is better than traditional Active Power Filter-APF.
Brief description of the drawings
Fig. 1 is the control structure figure of the parallel connection type active electric filter of the present invention；
Fig. 2 is the A phase power network current figures that the parallel connection type active electric filter of the present invention is not used；
Fig. 3 is the A phase power network current figures using the parallel connection type active electric filter of the present invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, the simplify control method of the parallel connection type active electric filter of the present invention, including DC voltage control
System, current sample and processing, current control, SVPWM drivings and three-phase full-bridge inverter compensation harmonic electric current, it is specially：
Step 1), DC voltage control are used for keeping the stabilization of DC capacitor voltage, are referred to by contrasting DC side
VoltageWith electric capacity virtual voltage Vdc, both differences are input to PI controllers, make virtual voltage VdcReal-time tracking is with reference to electricity
PressureThe transmission function of wherein PI controllers is：
Wherein KpFor proportionality coefficient, KiFor integral coefficient；
The present embodiment takes DC side reference voltageProportional coefficient Kp1=0.8, integral coefficient Ki1=0.2；Directly
Flow the output of side PI controllersWith load current d axle active componentsIt is added.
Step 2), current sample become the threephase load current signal that current transformer collects by abc/dq with processing
Change, obtain the load current component i under dq synchronous rotating framesLdAnd iLq, iLdAnd iLqFiltered out by low pass filter LPF negative
The harmonic component in electric current is carried, obtains the fundametal compoment of load currentWithWhereinWith in step 1) PI controllers it is defeated
Go outIt is added as the d axle fundametal compoments after adjustment Do not adjust directly as q axle fundametal compoments WithIt is defeated
Enter to dq/adc and convert, obtain threephase load fundamental current(k=a, b, c), the electric current and power network current iSk(k=a, b, c)
Compare, difference is input to current controller；Without detecting the harmonic current loaded in the step, threephase load base only need to be obtained
Ripple electric current.
Step 3), current controller realize that power network current tracks to the zero steady-state error of threephase load fundamental current；
The transmission function of current controller is：
Wherein KPFor proportionality coefficient, KIFor integral coefficient, ω0For resonant frequency；
The controller is ratio plural number integral controller, and gain of the controller at fundamental frequency shows as infinity, because
This can be realized tracks to power network current to the zero steady-state error for loading fundamental current；Here K is takenp=200, KI=7, ω0=
314；Error signal is input to SVPWM drivings after the effect of overcurrent controller；
Step 4), SVPWM drive modules produce the drive signal of three-phase full-bridge inverter, and three-phase full-bridge inverter is driving
The filtered inductance of thermal compensation signal is produced in the presence of signal to be connected to the grid, and realizes harmonic current compensation.
Fig. 2 and Fig. 3 is respectively A phase power network current figures and the use that the parallel connection type active electric filter of the present invention is not used
The A phase power network current figures of the parallel connection type active electric filter of the present invention., it is apparent that using this hair from comparison diagram
After bright parallel connection type active electric filter, harmonic wave is significantly suppressed, and compensation effect is fine.
Although the illustrative embodiment of the present invention is described above, those skilled in the art can manage
Solution：In the case where not departing from the principle and objective of the present invention, a variety of changes, modification can be carried out to these embodiments.Replace
Change and deform, the scope of the present invention is limited by claim and its coordinate.
Claims (4)
1. a kind of simplify control method of parallel connection type active electric filter, it is characterised in that comprise the following steps：
Step 1), by contrasting DC side reference voltageWith electric capacity virtual voltage Vdc, both differences are input to PI controls
Device, make virtual voltage VdcReal-time tracking reference voltageThe output of DC side PI controllersIt is active with the d axles of load current
ComponentIt is added；
Step 2), the threephase load current signal that current transformer collects convert by abc/dq, obtain dq synchronous rotaries and sit
Current component i under mark systemLdAnd iLq, iLdAnd iLqThe fundametal compoment of load current is obtained by low pass filter LPFWith
WhereinWith the output of PI controllers in step 1)It is added as the d axle fundametal compoments after adjustment Do not adjust straight
Connect as q axle fundametal compoments WithConverted by dq/adc, obtain threephase load fundamental currentThe electric current and power network
Electric current iSkCompare, difference is input to current controller；Wherein k=a, b, c；
Step 3), current controller realize that power network current tracks to the zero steady-state error of threephase load fundamental current；
Step 4), SVPWM drive modules produce the drive signal of three-phase full-bridge inverter, and three-phase full-bridge inverter is in drive signal
In the presence of produce the filtered inductance of thermal compensation signal be connected to the grid, realize harmonic current compensation.
2. the simplify control method of a kind of parallel connection type active electric filter as claimed in claim 1, it is characterised in that described
The transmission function of step 1) PI controllers is：Wherein KpFor proportionality coefficient, KiFor integral coefficient.
3. the simplify control method of a kind of parallel connection type active electric filter as claimed in claim 1, it is characterised in that described
The transmission function of current controller is in step 3)Wherein KPFor proportionality coefficient, KIFor integral coefficient, ω0For
Fundamental wave angular frequency.
4. the simplify control method of a kind of parallel connection type active electric filter as claimed in claim 1, it is characterised in that described
Current controller is ratio plural number integral controller.
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| CN201710999432.1A CN107732915A (en) | 2017-10-24 | 2017-10-24 | A kind of simplify control method of parallel connection type active electric filter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110148942A (en) * | 2019-06-10 | 2019-08-20 | 国电南瑞科技股份有限公司 | A kind of transformer magnetic compensation device and method adapting to rectification load |
| CN110336281A (en) * | 2019-06-06 | 2019-10-15 | 东南大学 | A kind of harmonic current gradation compensation method based on multiple cPCI controller |
| CN110854858A (en) * | 2019-10-29 | 2020-02-28 | 国网江苏省电力有限公司盐城供电分公司 | Compensation method of harmonic compensation device based on current analysis |
| CN111614135A (en) * | 2020-05-20 | 2020-09-01 | 浙江大学 | Energy flow-based composite power supply energy control method in outer limb robot |
| WO2023236624A1 (en) * | 2022-06-09 | 2023-12-14 | 国网河北省电力有限公司电力科学研究院 | Control method and apparatus for parallel apf |
-
2017
- 2017-10-24 CN CN201710999432.1A patent/CN107732915A/en active Pending
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336281A (en) * | 2019-06-06 | 2019-10-15 | 东南大学 | A kind of harmonic current gradation compensation method based on multiple cPCI controller |
| CN110336281B (en) * | 2019-06-06 | 2022-06-21 | 东南大学溧阳研究院 | Harmonic current fractional compensation method based on multi-cPCI controller |
| CN110148942A (en) * | 2019-06-10 | 2019-08-20 | 国电南瑞科技股份有限公司 | A kind of transformer magnetic compensation device and method adapting to rectification load |
| CN110148942B (en) * | 2019-06-10 | 2021-08-24 | 国电南瑞科技股份有限公司 | Transformer magnetic compensation device and method adaptive to rectification load |
| CN110854858A (en) * | 2019-10-29 | 2020-02-28 | 国网江苏省电力有限公司盐城供电分公司 | Compensation method of harmonic compensation device based on current analysis |
| CN111614135A (en) * | 2020-05-20 | 2020-09-01 | 浙江大学 | Energy flow-based composite power supply energy control method in outer limb robot |
| WO2023236624A1 (en) * | 2022-06-09 | 2023-12-14 | 国网河北省电力有限公司电力科学研究院 | Control method and apparatus for parallel apf |
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