CN103825274A - Method for active power filter self-adaption repetition and deadbeat compound control - Google Patents
Method for active power filter self-adaption repetition and deadbeat compound control Download PDFInfo
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- CN103825274A CN103825274A CN201310512617.7A CN201310512617A CN103825274A CN 103825274 A CN103825274 A CN 103825274A CN 201310512617 A CN201310512617 A CN 201310512617A CN 103825274 A CN103825274 A CN 103825274A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/20—Active power filtering [APF]
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Abstract
The invention discloses a method for active power filter self-adaption repetition and deadbeat compound control. An active power filter is formed by a voltage and current detection circuit, a master control circuit, a drive circuit and a main circuit. By utilizing a new self-adaption harmonic detection algorithm, and applying repetition and deadbeat soft start control technology, a compensation current, of which the value is the same with that of a harmonic current and the direction is opposite with that of the harmonic current. With the method, parameter variation in a grid can be adjusted, and the system is guaranteed to have relatively-fast dynamic response speed and relatively-high output waveform quality.
Description
Technical field
The present invention relates to a kind of method of Active Power Filter-APF control, relate in particular to a kind of method of new self adaptation Harmonic Detecting Algorithm, repetition and the compound control of dead beat for Active Power Filter-APF, adopt the Active Power Filter-APF of the method to carry out harmonic wave inhibition and reactive power compensation to electrical network, effectively improve the quality of power supply of electrical network, belonged to power electronics field of intelligent control.
Background technology
Current, the problem of environmental protection receives publicity day by day, it has been recognized that the necessity that power system environment purifies.A large amount of uses of power electronic equipment and the continuous increase of nonlinear load are injected a large amount of humorous reactive currents that involves to electrical network on the one hand, have worsened greatly the electrical network quality of power supply; Normal, the stable and efficient operation of these power electronic equipments and various load needs electrical network that the quality of power supply of high-efficiency high-quality is provided on the other hand.And in the situation that electric network pollution is day by day serious, the research to the electrical network quality of power supply and protection tool are of great significance, the harmonic content of electric power system is to weigh an important indicator of the quality of power supply.The application of power electronic device and nonlinear load makes to occur in electrical network a large amount of harmonic waves, thereby the quality of power supply to electrical network and the operation of user power utilization equipment make a big impact.Active filter (APF) is more and more subject to people's attention as a kind of equipment that can dynamic compensation harmonic wave, the compensation performance of active filter is subject to the impact that harmonic current detects, and the rapidity and the accuracy that how to improve harmonic current detection are the focuses that people study always.Harmonic Detecting Algorithm classical in APF comprises based on instantaneous reactive power theory
[1-3]and the Harmonic Detecting Algorithm of fast Fourier transform (FFT)
[4-6], the Harmonic Detecting Algorithm based on instantaneous reactive power theory need to design low pass filter, and rapidity and precision that the performance of low pass filter detects harmonic wave have a significant impact, but the existence of low pass filter inevitably can cause and postpone and decay signal.Harmonic Detecting Algorithm based on fast Fourier transform need to carry out Fourier transform and inverse transformation, and the processing speed of processor is had to very high requirement.The single Repetitive Control of the many employings of current domestic Active Power Filter-APF, although can guarantee that output waveform accurate tracking is given, but the control command that it obtains is not to export immediately, but just output after the reference cycle that lags behind, as patent No. CN201210389971.0(publication number: CN102882211A, open day on January 16th, 2013) a kind of self adaptation repetitive control for Active Power Filter-APF disclosed, though solved the Active Power Filter-APF compensation effect instability problem that mains frequency disturbance causes, but the control command that it obtains is not to export immediately, but just output after the reference cycle that lags behind, dynamic response is slow, real-time is not strong.
Summary of the invention
For the problem of above-mentioned prior art existence, the invention provides a kind of method of Active Power Filter-APF self adaptation repetition and the compound control of dead beat
, can parameter in electrical network be changed and be adjusted, the system of assurance has dynamic responding speed and higher output waveform quality faster.
For achieving the above object, the technical solution used in the present invention is: adopt a kind of self adaptation Harmonic Detecting Algorithm, repetition and dead beat Compound Control Technique and load to drop into moment soft start control technology.
The present invention adopts a kind of new self adaptation Harmonic Detecting Algorithm to carry out analytical calculation to systematic error function, obtain the partial derivative about step parameter, obtain scalar gradient, can self adaptation adjust the iteration step length of lowest mean square root Harmonic Detecting Algorithm, reduce the parameter that system regulates, and improved the performance of self adaptation Harmonic Detecting Algorithm.The new step-length iterative formula obtaining is as follows:
In formula
for step parameter, vector
a positive learning rate parameter that numerical value is very little,
for input,
represent filtering weight vector
about step parameter
the estimated value of gradient,
for error,
with
represent the intercepting of step parameter.
The present invention has adopted repetition and dead beat Compound Control Technique, can guarantee that output waveform accurate tracking is given although repeat to control, and the control command that it obtains is not to export immediately, but just output after the reference cycle that lags behind.Dead beat control has good dynamic response characteristic, thereby changes suddenly while making output voltage generation deviation when power supply or load, as long as a switch periods just can make output voltage tracing preset value again.Repeat and the dead beat control Compound Control Strategy that combines, the system that guaranteed has dynamic responding speed and higher output waveform quality faster.
Adopt soft Starting Technology, in order to realize validity and the rapidity of current tracking, APF DC voltage is greater than phase voltage peak value more than 2 times conventionally conventionally.System start time, first by charging resistor to DC bus capacitor precharge, charging galvanic current hold voltage far below set point.Excessive for preventing initial input deviation, after High Gain Feedback, form overcurrent, algorithm soft start is set.
Compared with prior art, the invention has the beneficial effects as follows: the method that adopts self adaptation Harmonic Detecting Algorithm, repetition and the compound control of dead beat to combine, solve that dynamic response was slow in the past, the difficult point that accuracy rate is not high, can be in real time the harmonic current situation of monitoring load accurately, and by the processing of this equipment, the harmonic current compensation of electrical network load to GB.
Accompanying drawing explanation
Fig. 1 is APF theory diagram in the present invention;
Fig. 2 is adaptive detection algorithm block diagram in the present invention;
Fig. 3 repeats and dead beat complex control algorithm block diagram in the present invention;
Fig. 4 is soft start block diagram in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
In Fig. 1: the present invention is built by electric current and voltage sample circuit, governor circuit, drive circuit and main circuit.Electric current and voltage sample circuit is mainly sampled to line voltage, load and inverter current by AD exactly; Governor circuit is exactly mainly DSP+FPGA, drive circuit is the driving signal that drives IGBT action in order to produce, main circuit is exactly three-phase inverter, programme and obtain PWM ripple and deliver to drive circuit by governor circuit, drive the IGBT work of inverter, make the offset current of one of its output and harmonic current equal and opposite in direction, opposite direction.
In Fig. 2: its basic principle is by the voltage in electrical network
through phase-locked loop and phase shift
the canonical reference input signal relevant to fundamental current is provided
with
, the fundamental signal in electrical network
as desired output signal, harmonic wave
as interference signal, total current is as original input signal; From definition and the orthogonality of trigonometric function of correlation function,
,
with
relevant, with
uncorrelated, make filter output by adjusting filter weight coefficient
in amplitude and phase place, approach fundamental current component
, then this signal is deducted from original input, just can obtain the command signal of the required individual harmonic current summation of APF.
In Fig. 3: feedback output valve Uo and set-point Ur, through the comparison of dead beat controller, determine the output u1 of next moment controller according to the reference value of the state vector of current time and next sampling instant, thereby reach the object of prediction; Feedback output valve Uo and given Ur relatively obtain deviation signal e, realize floating follow input signal through repetitive controller.
When used time of doing of large disturbance d appears in system, (as system load sudden change or direct voltage sudden change), tracking error signal e can become suddenly large, and owing to there is the time delay in a reference cycle in repetitive controller, and output u2 does not change; And dead beat controller produces regulating action during this period to guarantee that output voltage is unlikely to generation and suddenlys change.After a switch periods, repetitive controller produces regulating action reduces tracking error, until system reaches new steady operational status.
In Fig. 4: outer shroud DC side controller output be loaded into d shaft current given on, then obtain the output voltage u of APF on dq axle through interior ring controller
d, u
q.E in figure
drepresent that line voltage decomposes the component of d axle, e through coordinate transform
qrepresent q axle component, the great circle take O point as the center of circle is as e
drotational trajectory, with e
dterminal is that the roundlet in the center of circle is voltage rotating vector track u on reactor
l, vector e
d+ u
l=u
d.
The additional deviation of d axle is excessive when preventing from starting, and interior ring input deviation is excessive, and controller supersaturation causes occurring over-current phenomenon avoidance, and load drops into point and should meet || u
d|| <||e
d||, i.e. dash area in figure.In order to reduce to greatest extent the output voltage of d axle, select || u
d|| minimum some A point is as start-up point.In program, load drops into Rule of judgment is set, as line voltage e
dwith calculate the u obtaining according to load current
dwhile meeting near A point, drop into load, system harmonics abatement functions brings into operation.
Claims (4)
1. an Active Power Filter-APF self adaptation repeats and the method for the compound control of dead beat, adopt Active Power Filter-APF of the present invention to comprise electric current and voltage sample circuit, governor circuit, drive circuit and main circuit, it is characterized in that: it comprehensively adopts a kind of new self adaptation Harmonic Detecting Algorithm, repetition and dead beat composite control method.
2. the method for a kind of Active Power Filter-APF self adaptation repetition according to claim 1 and the compound control of dead beat, it is characterized in that: adopt a kind of new self adaptation Harmonic Detecting Algorithm to carry out analytical calculation to systematic error function, obtain the partial derivative about step parameter, obtain scalar gradient, can self adaptation adjust the iteration step length of lowest mean square root Harmonic Detecting Algorithm, reduce the parameter that system regulates, and improved the performance of self adaptation Harmonic Detecting Algorithm, the new step-length iterative formula obtaining is as follows:
In formula
for step parameter, vector
being a positive learning rate parameter that numerical value is very little, is input,
represent filtering weight vector
about step parameter
the estimated value of gradient,
for error,
with
represent the intercepting of step parameter.
3. the method for a kind of Active Power Filter-APF self adaptation repetition according to claim 1 and the compound control of dead beat, it is characterized in that: adopt and repeat and dead beat control technology, although repeat to control and can guarantee that output waveform accurate tracking is given, but the control command that it obtains is not to export immediately, but just output after the reference cycle that lags behind, dead beat control has good dynamic response characteristic, when thereby power supply or load change suddenly while making output voltage generation deviation, as long as a switch periods just can make output voltage tracing preset value again, repeat and the dead beat control Compound Control Strategy that combines, the system that guaranteed has dynamic responding speed and higher output waveform quality faster.
4. the method for a kind of Active Power Filter-APF self adaptation repetition according to claim 1 and the compound control of dead beat, it is characterized in that: adopt load to drop into moment soft start control technology, conventionally in order to realize validity and the rapidity of current tracking, APF DC voltage is greater than phase voltage peak value more than 2 times conventionally, when system starts, first by charging resistor to DC bus capacitor precharge, charging galvanic current holds voltage far below set point, excessive for preventing initial input deviation, after High Gain Feedback, form overcurrent, algorithm soft start is set.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532702A (en) * | 2016-11-25 | 2017-03-22 | 电子科技大学 | Improved broadband adaptive repetitive control method of active power filter |
| CN107147322A (en) * | 2017-06-26 | 2017-09-08 | 福州大学 | Double Buck full-bridge inverters iterative learning control methods |
| CN110168384A (en) * | 2017-09-08 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of harmonic detecting method and Active Power Filter-APF |
| CN112798846A (en) * | 2020-12-29 | 2021-05-14 | 联合汽车电子有限公司 | Harmonic current detection system and method for vehicle motor controller |
-
2013
- 2013-10-28 CN CN201310512617.7A patent/CN103825274A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 智永锋等: "自适应增益APA-AG算法的研究", 《西北工业大学学报》 * |
| 柴喆等: "有源电力滤波器谐波检测及控制方法综述", 《青海电力》 * |
| 柴喆等: "有源电力滤波器谐波检测及控制方法综述", 《青海电力》, vol. 27, no. 4, 31 December 2008 (2008-12-31) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532702A (en) * | 2016-11-25 | 2017-03-22 | 电子科技大学 | Improved broadband adaptive repetitive control method of active power filter |
| CN106532702B (en) * | 2016-11-25 | 2018-12-18 | 电子科技大学 | A kind of Active Power Filter-APF improvement adaptive repetitive control of wideband |
| CN107147322A (en) * | 2017-06-26 | 2017-09-08 | 福州大学 | Double Buck full-bridge inverters iterative learning control methods |
| CN107147322B (en) * | 2017-06-26 | 2023-04-07 | 福州大学 | Iterative learning control method for double-Buck full-bridge inverter |
| CN110168384A (en) * | 2017-09-08 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of harmonic detecting method and Active Power Filter-APF |
| CN112798846A (en) * | 2020-12-29 | 2021-05-14 | 联合汽车电子有限公司 | Harmonic current detection system and method for vehicle motor controller |
| CN112798846B (en) * | 2020-12-29 | 2024-03-19 | 联合汽车电子有限公司 | Harmonic current detection system and method for vehicle motor controller |
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Application publication date: 20140528 |