CN106655182A - Composite-control active filter based on high-compensated precision current loop and control method thereof - Google Patents
Composite-control active filter based on high-compensated precision current loop and control method thereof Download PDFInfo
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- CN106655182A CN106655182A CN201610650113.5A CN201610650113A CN106655182A CN 106655182 A CN106655182 A CN 106655182A CN 201610650113 A CN201610650113 A CN 201610650113A CN 106655182 A CN106655182 A CN 106655182A
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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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- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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 invention relates to the active filter current loop composite control technology field and especially relates to a composite-control active filter based on a high-compensated precision current loop and a control method thereof. The filter comprises an active-filter general control circuit connected to a sampling side power grid. The active-filter general control circuit comprises a harmonic wave separation module. An output terminal of the harmonic wave separation module is connected into a load side power grid successively through a current loop composite controller and a filtering module. An output terminal of the filtering module is connected to an input terminal of the current loop composite controller. By using the filter and the method of the invention, all the periodic errors contained in a stable closed loop can be effectively eliminated and stable state precision is increased.
Description
Technical field
The present invention relates to active filter electric current loop Compound Control Technique field, more particularly to based on high compensation precision electric current
The composite control type active filter of ring and control method.
Background technology
Since being born from IGCT, because its derivative power electronic product is constantly changing daily life, base
Increasingly receive the concern of people and quote in the superiority of the power electronic product of IGCT.At the same time it is substantial amounts of in electrical network
The power electronic equipment based on nonlinear loads such as IGCTs is introduced, serious harmonic pollution in electric power net is result in.This is mainly
Because what the non-linear of these loads, impact and unbalanced electrical characteristics were caused.Thus be accordingly used in the active filter of harmonics restraint
Ripple device technology gradually becomes domestic and international power electronics in recent years and one of electrical field and the study hotspot with electrical domain.It is active
Electric-power filter (APF) is a kind of for dynamic harmonic wave, the novel electric power electric device of compensating reactive power, and it is based on the modern times
Control technology and advanced digital high-speed processor, to related data high speed processing is carried out so as to can be big to different amplitudes
Little and frequency harmonic wave carries out quick tracing compensation, is quickly reacted in microsecond unit, makes harmonic wave in network system
Total vector be zero.Relative and passive filter, can only carry out in power frequency period operating passing zero reaction speed and can only
For enough frequencies of Passive intake fixation and the harmonic wave of size, active filter can pass through sampling load current and carry out each time
The separation of harmonic wave and idle separation, by active filter the simultaneously size for sending electric current of active, frequency and phase place are controlled,
And quick response, offsets the corresponding harmonic wave in load
Electric current, realizes dynamic tracing compensation, not only can compensation harmonic and idle but also can process imbalance and ask
Topic.
Active filter is carried out quickly in real time from the beginning of load current or system power collection to gathered data
Process, the harmonic wave of system, idle and imbalance problem are quickly eliminated according to the data of collection, so as to improve the power supply matter of electrical network
Amount.Active filter is compared with traditional passive filter, and the compensation way of APF is more flexible, compensation function also more comprehensively,
All of harmonic wave can be compensated can also be compensated according to the harmonic wave specified time, can be with except possessing while compensation harmonic
Compensation part is idle and three phase unbalance current.
The APF of parallel connection at present reaches the detached function of harmonic wave single and idle separation through related control algolithm, uneven
The separation of electric current, error amount, error are done with detached correlated current as reference instruction electric current IRa and device output current ICa
Value quickly allows device to send the vector value contrary with harmonic component in system through current follow-up control algorithm.But
Traditional current follow-up control strategy mostly is Hysteresis control, traditional PI tracking, the PI control algolithms of amendment type etc., wherein stagnant ring
Control can produce wider harmonic spectrum, without fixed switching frequency, it is impossible to the switching frequency subharmonic of control input electrical network
Electric current, so as to cause the parameter of output filter of APF to determine；For traditional PI controllers are straight along being used for always
The tracing control without static error of flow, for the harmonic current of APF, tracking is of ac, and PI cannot realize nothing
Static error tracing control, for reference instruction electric current IRa and device sends the error amount of electric current, speed of action and the degree of accuracy compared with
It is low, it is impossible to realize perfect tracking control, cause device cancellation ratio relatively low, do not reach the harmonic current in the system of being completely counterbalanced by.
Existing notification number is the Chinese invention patent application file of CN201510018591, discloses one kind《One kind is based on
PI controls the fast current tracking and controlling method of active filter》, including " step one：Setting worst error current-responsive value △
imax；Step 2：Obtain error current value △ i；Step 3：With error current value △ i divided by worst error current-responsive value △
Imax, obtains its integral multiple numerical value n and error remainder electric current △ i '；Step 4：Error remainder electric current △ i ' are directly entered PI tune
Section device is calculated and obtains the first output voltage V1, integral multiple numerical value n is calculated by volt-second characteristic and obtains the second output voltage V2；Step
Rapid five：First output voltage V1 and the second output voltage V2 is added and obtains modulation voltage V.By adding input before PI is adjusted
Error is limited, and is then supplemented after PI outputs, realizes output voltage to electric current without delay response." however, the patent of invention is needed
Worst error current-responsive value is set, closed-loop adaptation control is not belonging to, it is impossible to which enough dynamic sizes with load current change
Voluntarily adjusted.Whole control method adopts opened loop control, when setting value and system load be actually needed value it is excessive when, easily
Produce overcompensation or undercompensation situation.Worst error current-responsive value is difficult to define in its whole control system, for reality
The place of border load frequent conversion, worst error current-responsive value is difficult to determine a rational value.Calculate in the control in addition
The error of harmonic wave target current and output current always tends to what is be continually changing in method system, the error amount for obtaining again with setting
Worst error current-responsive value does the computing of integral multiple and remainder times, and simply the covert difference PI tracking diminishes, can not
The real purpose for playing astatic tracking.
The content of the invention
The technical problem to be solved is for the above-mentioned problems in the prior art, there is provided a kind of stable state
High precision, fast response time, can by tracking to of ac eliminate static error based on high compensation precision electric current loop
Composite control type active filter and control method.
To solve the above problems, a kind of technical scheme of the present invention is：
The present invention based on high compensation precision electric current loop composite control type active filter, including be connected to sampling side electrical network
On active filter universal control circuit, described active filter universal control circuit includes harmonic wave separation module；It is described
The output end of harmonic wave separation module pass sequentially through electric current loop composite controller, filtration module and be connected into load-side electrical network；Described
The output end of filtration module connects the input of electric current loop composite controller.
Further, described electric current loop composite controller includes electric current outer shroud control system and current inner loop control system
System.
Further, described electric current outer shroud control system includes forward path modulating unit and backward channel feedback
Unit.
Further, described current inner loop control system includes current inner loop PI control unit.
A kind of control method of the composite control type active filter based on high compensation precision electric current loop, including following step
Suddenly：
S1, described active filter universal control circuit collection line voltage, load current and device output current ICa
And process, described harmonic wave separation module output reference instruction electric current IRa is defeated by described reference instruction electric current IRa and device
Go out electric current ICa and be input to described electric current loop composite controller computing；
S2, described reference instruction electric current IRa and device output current ICa carry out difference operation, obtain error amount
Error, error amount error are distinguished in the electric current outer shroud control system of described electric current loop composite controller based on internal model principle
Processed by forward path modulating unit and backward channel feedback unit, obtained the error amount △ error1 in cycle；
At the current inner loop PI control unit of the current inner loop control system described in S3, the error amount △ error1 Jing in cycle
Reason, is adjusted using PI controls to mutation Error.
Further, in described step S1,
S1.1, collection line voltage, load current and device output current ICa, in the base of sampling side network system voltage
Process through related phase-lock-loop algorithm on plinth, draw the phase angle Ф of the A phases of network system, and sine value is asked to phase angle Ф
And cosine value；
The sine value and cosine at the phase angle of the positive sequence of the A phases that S1.2, the load current of collection and step S1.1 are obtained
Value, through harmonic wave separation algorithm, the load current to gathering carries out harmonic wave separation, the amplitude phase of harmonic current each time
Position, direction vector are separated, and then harmonic wave each time is added and obtains reference instruction electric current IRa；
S1.3, device output current ICa reach the model of AD inputs through outside Acquisition Circuit and the modulate circuit of correlation
Enclose, the reference instruction electric current IRa after AD digitlizations and in previous step is input to together described electric current loop complex controll
Device.
Further, described harmonic wave separation algorithm is FFT or DQ0 or PR.
Further, in described step S2,
S2.1. reference instruction electric current IRa and device output current ICa carry out obtaining error amount error after difference operation, will
Error carries out obtaining sum with computing with the correction value of backward channel compound function Q (Z) * S (Z) based on internal model principle；
S2.2. described sum values are inputed to into the first cycle time delay integration device function S (n), is given below cycle points
Time delay integration function amendment, through revised numerical value be △ error；
S2.3. △ error obtained in the previous step are sent into into second-order low-pass filter function C (Z), is obtained through the wave filter
To △ error1.
Further, the feedback of described backward channel, sequentially passes through auxiliary compensation device Q (Z) and cycle points time delay is repaiied
Positive function S (Z) process, obtains compound function Q (Z) * S (Z).
Further, in described step S3,
3.1. △ error1 and described reference instruction electric current IRa is done and obtains sum1 with computing, sum1 pass through with it is described
Device output current ICa do difference operation and obtain △ error2；
3.2. by △ error2 by described current inner loop PI controller to error summary responses, carry out quick dynamic
Response.
Prior art is compared to, the present invention is directed to the defect of prior art,
The present invention, for of ac is unable to reach DAZ gene problem, is proposed for traditional current follow-up control algorithm
A kind of complex control device controlled based on internal model principle and PI.Described complex control device passes through the last week interim appearance
The distortion of waveform will repeat in the same time of next primitive period, then controller is according to command signal and feedback letter
Number error determine required for correction signal, this correction signal is superimposed upon into original control signal in next cycle synchronization
On, so as to the repetition sex distortion that will appear from each cycle after eliminating, all being included in stable closed loop can be effectively eliminated
Periodic error, improve stable state accuracy.In order to improve dynamic response time while stable state accuracy is improved, based on internal model
The forward path and backward channel control algolithm of principle is embedded in PI controller inner ring, and using PI system dynamic response speed is accelerated
Degree, so as to improve the stable state accuracy and dynamic property of whole current loop control, ensures that current tracking compensation precision reaches optimal
Effect.
The present invention proposes a kind of complex control algorithm of the current tracking without static error, and solving PI tracking of acs cannot
The problem of DAZ gene is realized, while also solving quasi- ratio resonant controller (PR) needs multichannel, parameter matching is more numerous
Trivial problem.The present invention adopts multiple control algorithm through compound innovation to electric current loop, carries out in electric current outer shroud fixed time period
The reparation of harmonic reference instruction current IRa is corrected, the harmonic current value for constantly making it level off in system, improves the steady of system
State precision, current inner loop utilizes tracing control, quickly makes dynamic response and improves dynamic accuracy, and active filter is improved with this
The filtering performance of ripple device.
The present invention based on internal model principle error correction controller, put one by one after work to target current value and device
The error of output current value is corrected so as to which the instruction current of next cycle levels off to the current value of a cycle, this
Would not there is catastrophe in sample, be adapted to PI controllers to PI controllers again.Using closed-loop control, it is not necessary to carry out error parameter
Setting, control system carries out the error correction of closed loop, it is not necessary to examine according to realistic objective electric current and the difference of device output current
Consider optimized dynamic response value.Because the integral parameter in PI control systems is in cycle, integrated value is finally zero, integrates school
Plus effect is not present, and the corrector based on internal model principle can make up integrating effect, and the integration of PI is compensated.
Description of the drawings
Fig. 1 is the overall structure diagram of active filter involved in the present invention
Fig. 2 is involved in the present invention based on high compensation precision electric current loop composite controller structural representation.
Fig. 3 is the control algolithm transmission function flow chart of electric current loop composite controller involved in the present invention.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples, but protection scope of the present invention is not limited to
This.
With reference to Fig. 1, composite control type active filter of the present invention based on high compensation precision electric current loop, adopt including being connected to
Active filter universal control circuit on the electrical network of sample side, described active filter universal control circuit includes harmonic wave separation mould
Block；The output end of described harmonic wave separation module passes sequentially through electric current loop composite controller, filtration module and is connected into load-side electrical network；
The output end of described filtration module connects the input of electric current loop composite controller.
Described electric current loop composite controller includes electric current outer shroud control system and current inner loop control system.
Described electric current outer shroud control system includes forward path modulating unit and backward channel feedback unit.
Described current inner loop control system includes current inner loop PI control unit.
A kind of control method of the composite control type active filter based on high compensation precision electric current loop, including following step
Suddenly：
S1, described active filter universal control circuit collection line voltage, load current and device output current ICa
And process, described harmonic wave separation module output reference instruction electric current IRa is defeated by described reference instruction electric current IRa and device
Go out electric current ICa and be input to described electric current loop composite controller computing；
S2, described reference instruction electric current IRa and device output current ICa carry out difference operation, obtain error amount
Error, error amount error are distinguished in the electric current outer shroud control system of described electric current loop composite controller based on internal model principle
Processed by forward path modulating unit and backward channel feedback unit, obtained the error amount △ error1 in cycle；
At the current inner loop PI control unit of the current inner loop control system described in S3, the error amount △ error1 Jing in cycle
Reason, is adjusted using PI controls to mutation Error.
In described step S1,
S1.1, collection line voltage, load current and device output current ICa, in the base of sampling side network system voltage
Process through related phase-lock-loop algorithm on plinth, draw the phase angle Ф of the A phases of network system, and sine value is asked to phase angle Ф
And cosine value；
The sine value and cosine at the phase angle of the positive sequence of the A phases that S1.2, the load current of collection and step S1.1 are obtained
Value, through harmonic wave separation algorithm, the load current to gathering carries out harmonic wave separation, the amplitude phase of harmonic current each time
Position, direction vector are separated, and then harmonic wave each time is added and obtains reference instruction electric current IRa；
S1.3, device output current ICa reach the model of AD inputs through outside Acquisition Circuit and the modulate circuit of correlation
Enclose, the reference instruction electric current IRa after AD digitlizations and in previous step is input to together described electric current loop complex controll
Device.
Described harmonic wave separation algorithm is FFT or DQ0 or PR.
In described step S2,
S2.1. reference instruction electric current IRa and device output current ICa carry out obtaining error amount error after difference operation, will
Error carries out obtaining sum with computing with the correction value of backward channel compound function Q (Z) * S (Z) based on internal model principle；
S2.2. described sum values are inputed to into the first cycle time delay integration device function S (n), is given below cycle points
Time delay integration function amendment, through revised numerical value be △ error；
S2.3. △ error obtained in the previous step are sent into into second-order low-pass filter function C (Z), is obtained through the wave filter
To △ error1.
The feedback of described backward channel, sequentially passes through auxiliary compensation device Q (Z) and cycle points time delay correction function S (Z)
Process, obtain compound function Q (Z) * S (Z).
In described step S3,
3.1. △ error1 and described reference instruction electric current IRa is done and obtains sum1 with computing, sum1 pass through with it is described
Device output current ICa do difference operation and obtain △ error2；
3.2. by △ error2 by described current inner loop PI controller to error summary responses, carry out quick dynamic
Response.
A kind of complex controll active filter of high compensation precision electric current loop of the present invention is logical including described active filter
With control circuit, electric current loop composite controller, filtration module, described active filter universal control circuit is including analog signal
Modulate circuit, digital processor (FPGA+DSP), described filtration module includes IGBT drivers, inverter module, LCL filters
Ripple networking module.Its workflow is briefly introduced as follows：Analog signal conditioner circuit will obtain sampling side line voltage, electricity
Epidemic simulation signal condition, the analog signal after conditioning is digitally converted using digital processor (FPGA+DSP),
Give processor and enter the separation calculating of horizontal lock computing harmonic, the electric current after to separation, will as reference instruction electric current IRa
Reference instruction electric current IRa carries out the computing of electric current loop composite controller with the difference of device output current ICa of reality, and output is driven
Dynamic signal gives IGBT drivers, drives IGBT open-minded, to export the filtered circuit for filtering appts harmonic current.
It should be noted that the FPGA (Field Programmable Gate Array) that the present invention is referred to, i.e., scene can
Programming gate array, as special IC field in a kind of semi-custom circuit occur, its purpose is exactly to improve circuit design
Flexibility.The speed of service of control algolithm can be greatly improved by the way of parallel processing, conventional processors is solved suitable
The not enough problem that sequence is performed.Abundant logic gate array can solve the logic control for loading, and make each logic control simultaneously
Row is performed, and consistent requirement is fully achieved in execution action, improves Control system resolution.
The DSP (Digital signal processor) that the present invention is referred to is a kind of to be partial to signal digitized processing
Microprocessor, is the device that bulk information is processed with data signal, mainly for the number on time and amplitude being all discretization
According to being processed, mainly signal is analyzed, converts, filters, detects, is modulated, with powerful programmability and computing
Speed, the speed of service is up to per number of seconds, with ten million complicated order program, performance much surmounts general purpose controller when in fact.
The IGBT (InsulatedGateBipolarTransistor) that the present invention is referred to refers to insulated gate bipolar crystal
Pipe, a kind of high speed electronic switch device.Reference current is referred to from the point of view of elimination mains by harmonics angle, it is desirable to the electricity of device output
Stream, reference current can change with the change of the load current.
The internal model principle of forward path and backward feedback of the present invention based on electric current loop composite controller is to by the error in week
It is adjusted, the reference instruction electric current IRa errors for making each cycle are zero, so as to improve systematic steady state precision and tracking essence
Degree.
In addition, in step S2, because the frequency range of active filter compensation is 0 to 2.5KHz, therefore controller is designed
When only need to ensure in low-frequency range control effect, comprehensive overall performance demand, it is only necessary to which a second-order low-pass filter is set
To increase the suppression to high frequency, and △ error are sent into into the second-order low-pass filter.
Fig. 2 is a kind of tracking of composite control type active filter based on high-accuracy compensation electric current loop of the present invention
The structural representation of the control method of electric current loop.As shown in Fig. 2 the present invention is based on high-accuracy compensation electric current loop complex controll
Device, by the double-loop current control controlled based on internal model principle and PI, with reference to related algorithm, is realized to each week by software
The error of ripple carries out correction process, improves steady-state error precision.Using the control of PI current inner loops, there is no error in stable state accuracy
On the premise of, using fast reaction of the PI controllers to error, come the comprehensive dynamic responding speed for improving electric current, Liang Zhejie
Conjunction makes electric current loop tracing control reach the purpose without static error control.
The algorithm that the present invention is adopted includes the harmonic current separation algorithm of active filter universal control circuit, also including this
The complex control algorithm of the current tracking without static error of the electric current loop composite controller that invention is illustrated, and DC voltage control
Algorithm processed, SPWM generating algorithms, IGBT inversion modules, networking LCL filtration modules.Described complex control algorithm module is wrapped successively
Include reference instruction electric current IRa, device output current ICa, (the multicycle effect control of electric current outer shroud control system of harmonic wave separation module
Device processed) and current inner loop control system (PI controllers composition).Simply point out that whole machine operation principle is as follows first：Parallel connection type active
Wave filter universal control circuit obtains sampling side mains voltage signal and current signal, signal condition is simulated, after conditioning
Analog quantity be respectively fed to digital processing chip, carry out digital conversion, by after conversion result send into processor, enter line phase and
The calculating of frequency, using the phase and frequency for calculating, carries out harmonic current, idle and out-of-balance current separation, will divide
Reference instruction electric current IRa and device output current ICa after is input in electric current loop composite controller of the present invention, Jing
Overcurrent ring composite controller, the desired value after process is given to SPWM makers, generates pwm signal, drives IGBT to be referred to
Instruction current IRa inversion output, through smoothing reactor and networking reactance, in output current to system, produced with this and
Harmonic current is in opposite direction in system, equal-sized vector with the harmonic current in elimination system, so as to improve network system
Power supply quality.
In view of the deficiency of the AC characteristic of harmonic current and traditional tracking control unit, the present invention is specially for electric current loop presence
Tracking error problem, propose quick correcting error control algolithm, make whole harmonic current level off to humorous present in system
Ripple electric current, through the complex controll of electric current loop, reaches the quick output without static error and the equal side of system harmonicses size of current
To contrary current value, to reach the system of being completely eliminated in harmonic current purpose.Solve the tracking of conventional current ring controller
The drawbacks of there is static error and system harmonicses can not be completely eliminated, so as to improve the compensation performance of equipment, optimizes active filter
Ripple device overall performance.
Below only highly preferred embodiment of the present invention is described, but is not to be construed as limiting the scope of the invention.This
Invention is not limited only to above example, and all various changes made in the protection domain of independent claims of the present invention are at this
In the protection domain of invention.
Claims (10)
1. a kind of composite control type active filter based on high compensation precision electric current loop, samples on the electrical network of side including being connected to
Active filter universal control circuit, described active filter universal control circuit includes harmonic wave separation module；Its feature exists
In the output end of described harmonic wave separation module passes sequentially through electric current loop composite controller, filtration module and is connected into load-side electrical network；
The output end of described filtration module connects the input of electric current loop composite controller.
2. a kind of composite control type active filter based on high compensation precision electric current loop according to claim 1, it is special
Levy and be, described electric current loop composite controller includes electric current outer shroud control system and current inner loop control system.
3. a kind of composite control type active filter based on high compensation precision electric current loop according to claim 2, it is special
Levy and be, described electric current outer shroud control system includes forward path modulating unit and backward channel feedback unit.
4. a kind of composite control type active filter based on high compensation precision electric current loop according to Claims 2 or 3, its
It is characterised by, described current inner loop control system includes current inner loop PI control unit.
5. it is a kind of as claimed in claim 4 based on high compensation precision electric current loop composite control type active filter controlling party
Method, it is characterised in that comprise the following steps：
S1, described active filter universal control circuit collection line voltage, load current and device output current are simultaneously processed,
Described harmonic wave separation module output reference instruction electric current, by described reference instruction electric current and device output current institute is input to
The electric current loop composite controller computing stated；
S2, described reference instruction electric current and device output current carry out difference operation, obtain error amount error, error amount
Error passes through respectively forward path in the electric current outer shroud control system of described electric current loop composite controller based on internal model principle
Modulating unit and backward channel feedback unit are processed, and obtain the error amount △ error1 in cycle；
The current inner loop PI control unit of the current inner loop control system described in S3, the error amount △ error1 Jing in cycle is processed,
Mutation Error is adjusted using PI controls.
6. the control of a kind of composite control type active filter based on high compensation precision electric current loop according to claim 5
Method, it is characterised in that：In described step S1,
S1.1, collection line voltage, load current and device output current, pass through on the basis of sampling side network system voltage
Related phase-lock-loop algorithm is processed, and draws the phase angle Ф of the A phases of network system, and asks sine value and cosine to phase angle Ф
Value；
The sine value and cosine value at the phase angle of the positive sequence of the A phases that S1.2, the load current of collection and step S1.1 are obtained, Jing
Harmonic wave separation algorithm is crossed, the load current to gathering carries out harmonic wave separation, the amplitude phase, vector harmonic current each time
Direction is separated, and then harmonic wave each time is added and obtains reference instruction electric current；
S1.3, device output current reach the scope of AD inputs, through AD through outside Acquisition Circuit and the modulate circuit of correlation
Reference instruction electric current after digitlization and in previous step is input to together described electric current loop composite controller.
7. the control of a kind of composite control type active filter based on high compensation precision electric current loop according to claim 5
Method, it is characterised in that：Described harmonic wave separation algorithm is FFT or DQ0 or PR.
8. the control of a kind of composite control type active filter based on high compensation precision electric current loop according to claim 5
Method, it is characterised in that：In described step S2,
S2.1. reference instruction electric current and device output current carry out obtaining error amount error after difference operation, by error and base
Carry out obtaining sum with computing in the correction value of backward channel compound function Q (Z) * S (Z) of internal model principle；
S2.2. described sum values are inputed to into the first cycle time delay integration device function S (n), gives cycle points following time delay
Integral function amendment, through revised numerical value be △ error；
S2.3. △ error obtained in the previous step are sent into into second-order low-pass filter function C (Z), through the wave filter △ is obtained
error1。
9. the control of a kind of composite control type active filter based on high compensation precision electric current loop according to claim 8
Method, it is characterised in that：The feedback of described backward channel, sequentially passes through auxiliary compensation device Q (Z) and cycle points time delay amendment
Function S (Z) process, obtains compound function Q (Z) * S (Z).
10. the control of a kind of composite control type active filter based on high compensation precision electric current loop according to claim 5
Method processed, it is characterised in that：In described step S3,
3.1. △ error1 are done with described reference instruction electric current and obtains sum1 with computing, sum1 passes through defeated with described device
Go out electric current and do difference operation to obtain △ error2；
3.2. by △ error2 by described current inner loop PI controller to error summary responses, carry out quickly dynamic and ring
Should.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610650113.5A CN106655182A (en) | 2016-08-09 | 2016-08-09 | Composite-control active filter based on high-compensated precision current loop and control method thereof |
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| CN201610650113.5A CN106655182A (en) | 2016-08-09 | 2016-08-09 | Composite-control active filter based on high-compensated precision current loop and control method thereof |
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