CN109599868A - A kind of control system and method for active filter output electric current - Google Patents
A kind of control system and method for active filter output electric current Download PDFInfo
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- CN109599868A CN109599868A CN201811437125.5A CN201811437125A CN109599868A CN 109599868 A CN109599868 A CN 109599868A CN 201811437125 A CN201811437125 A CN 201811437125A CN 109599868 A CN109599868 A CN 109599868A
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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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of control systems of active filter output electric current, which is characterized in that including current transformer, LCL output filter network, inner loop control device and outer ring controller；Outer ring controller is used for using current transformer current on line side signal as input signal, grid side exports electric current as feedback signal, outer ring controller is to being output to inner loop control device after signal processing, inner loop control device uses current waveform current waveform instantaneous value tracing control, it generates output signal and is output to current transformer, realize the accurate control to each frequency content, the output end of current transformer is electrically connected the harmonic current that can be used for compensating multiple frequency contents simultaneously with LCL output filter network, the outer ring of control system is provided with the amplitude of each frequency content of closed-loop control and the outer ring controller of phase, when solving while controlling multiple frequency contents, the control effect of each frequency content can interact the problem of coupling, realize the accurate control of multi-frequency ingredient combined waveform.
Description
Technical field
The present invention relates to the technical field of active filter output current regulation more particularly to a kind of single-phase active power filters
Export the high-accuracy control method of electric current.
Background technique
In the control of Monophase electric power electronic inverter, output electric current be can wrap containing multiple and different frequency contents, be made
With current waveform Instantaneous control method, tracing control error is certainly existed for AC signal.To mention high control precision, increase
Outer ring controller is independently controlled each frequency content.Has maturation side for the design of control loop under fundamental frequency
Method, but when needing while when controlling multiple frequency contents, the control effect of each frequency content can interact coupling, to each
The control parameter design of frequency content controller brings difficulty.The method mostly gathered using examination in existing application, is unfavorable for engineering
It promotes.
Summary of the invention
It is an object of the invention to the active filter for proposing that a kind of pair of active filter output off current HIGH precision is adjusted is defeated
The control system and method for electric current out.
To achieve this purpose, the present invention adopts the following technical scheme:
Including current transformer, LCL output filter network, inner loop control device and outer ring controller；
The exchange side of the current transformer is electrically connected with LCL output filter network, the feedback letter of the inner loop control device
Number input terminal is electrically connected with the output end of the current transformer, the signal input part of the inner loop control device and the outer ring controller
Output end electrical connection, the output end of the inner loop control device is electrically connected with the signal input part of the current transformer, the outer ring
The feedback signal input terminal of controller is electrically connected with the input terminal of LCL output filter network, the letter of the outer ring controller
Number input terminal is electrically connected with the output end of LCL output filter network；
The outer ring controller includes phase lock circuitry PLL, multiple DET modules, multiple frequency content controllers, multiple IDET
The output end of module and a summation module, the input terminal and LCL output filter network of the phase lock circuitry PLL is electrically connected
It connecing, the output end of the phase lock circuitry PLL is electrically connected with multiple DET modules and multiple IDET modules one by one respectively,
The output end of each DET module is respectively electrically connected with the feedback signal input terminal of a frequency content controller, each described
The output end of frequency content controller is respectively electrically connected with the input terminal of an IDET module, all IDET modules it is defeated
Outlet is electrically connected with the input terminal of the summation module, the input of the output end of the summation module and the inner loop control device
End electrical connection.
The output end of current transformer is electrically connected the harmonic wave that can be used for compensating multiple frequency contents simultaneously with LCL output filter network
Electric current, the outer ring of control system are provided with the amplitude of each frequency content of closed-loop control and the outer ring controller of phase, realize
Accurate control to each frequency content is controlled by inner loop control device by the output signal after outer ring controller, is solved
Simultaneously when controlling multiple frequency contents, the control effect of each frequency content can interact the problem of coupling, and realize multi-frequency
The accurate control of ingredient combined waveform.
Preferably, the frequency content controller is PI controller, and multiple frequency content controllers are followed successively by fundamental wave
Controller and 2~nth harmonic controller, the proportional control factor of 2~nth harmonic controller control amplitude are as follows:
Kp1n=Kp11/n0.5；
The integral coefficient of 2~nth harmonic controller control amplitude are as follows:
Kiln=Ki11/n0.5；
The proportionality coefficient of 2~nth harmonic controller control phase are as follows:
Kp2n=Kp21；
The integral coefficient of 2~nth harmonic controller control phase are as follows:
Ki2n=Ki21。
Frequency content controller controls the amplitude and phase of multiple frequency contents, by the way that each frequency content controller is arranged
Control amplitude proportional control factor, control amplitude integral coefficient, control phase proportionality coefficient, control phase integral
Coefficient is to control the integral coefficient and proportionality coefficient of frequency content controller.
Preferably, the ratio of the fundamental wave controller controls amplitude proportionality coefficient and the phase controlling to fundamental wave component
Control coefrficient is equal,
Kp11=Kp21；
The integral coefficient phase of integral coefficient and the phase controlling to fundamental wave component that the fundamental wave controller controls amplitude
Deng,
Ki11=Ki21。
In the control of fundamental wave component, the parameter of fundamental wave component be set as to amplitude control proportionality coefficient and to fundamental wave at
The proportional control factor for the phase controlling divided is equal, and to the integral coefficient of amplitude control and to the phase controlling of fundamental wave component
Integral coefficient it is equal.
Preferably, the inner loop control device includes triangular-wave generator, amplifier A, operational amplifier C, two diodes
The signal input part of D1, D2, two triodes Q1, Q2 and power supply Ud, the amplifier A and the output end of the outer ring controller
Electrical connection, the feedback signal input terminal of the amplifier A are electrically connected with the output end of the current transformer, the operational amplifier C
Non-inverting input terminal be electrically connected with the output end of the amplifier A, the inverting input terminal of the operational amplifier C and the triangle
The output end of wave producer is electrically connected, and base stage of the output end of the operational amplifier C respectively with described triode Q1, Q2 is electrically connected
It connects, signal input part of the emitter of the triode Q1 respectively with the collector of the triode Q2 and the current transformer is electrically connected
It connects, the anode of described diode D1, D2 are electrically connected with the emitter of described triode Q1, Q2 respectively, described diode D1, D2's
Cathode is electrically connected with the collector of described triode Q1, Q2, the collector electricity of the anode and the triode Q1 of the power supply Ud
Connection, cathode are electrically connected with the emitter of the triode Q2.
Triangular-wave generator is equipped with proportional integration characteristic for defeated to outer ring controller for triangular wave, amplifier A to occur
The enhanced processing of signal out, operational amplifier C are used for the amplified output signal of comparison amplifier and triangular signal, power supply Ud
For providing power supply for two triodes.
A kind of control method of active filter output electric current, the control system including the active filter output electric current
System, comprising the following steps:
Step A. data sampling acquires the grid side electric current i of current transformerGFor the feedback signal of outer ring controller, with unsteady flow
The grid side of device exports electric currentSignal for the input signal of outer ring controller, after being calculated by outer ring controllerIt is interior
The input signal of ring controller, inner loop control device is to sample current transformer side electric current iLFor feedback signal, driven with the current transformer of generation
Dynamic logical signal d is output signal, the output voltage v of driving logic d control current transformerL, current transformer output voltage vLWith power grid electricity
Press vGIt is acted on LCL output filter network simultaneously, electric current i required for generatingG；
The control of step B. locking phase, DFT block sinusoidal, cosine signal synchronous with needed for IDFT module is by network voltage vGIt is logical
It is obtained after crossing phase lock circuitry PLL；
Step C. outer loop control, current transformer current on line side signal iG(t) it is carried out after entering outer ring controller by DET module
Multiple frequency content I are resolved into after Fourier transformation1(m)~In(m), the output electric current of grid sideInto outer loop control
Multiple frequency contents are resolved into after deviceI1(m)~In(m) each frequency content is by amplitude Amp
(InAnd phase Ang (I (m))n(m)) two variable compositions,Each frequency content by amplitudeAnd phaseTwo variable compositions, to I1(m)~In(m) each frequency
Amplitude Amp (the I of rate ingredientnAnd phase Ang (I (m))n(m)) andAmplitudeAnd phaseIt respectively corresponds through multiple frequency content controller closed loops
Control, will be respectively S by the output signal of each frequency content after frequency content controller1(m)~Sn(m), output is believed
Number S1(m)~Sn(m) by being added after IDFT module progress Fourier inversion by summation module, outer ring controller is generated
Output signal
Step D. inner loop control, the output signal of outer ring controllerCurrent waveform current wave is used by inner loop control device
Shape instantaneous value tracing control, output logic signal d；
Step E. output signal, logical signal d are output in current transformer, control the output voltage v of current transformerL。
The output end of current transformer is electrically connected the harmonic wave that can be used for compensating multiple frequency contents simultaneously with LCL output filter network
Electric current, the outer ring of control system are provided with the amplitude of each frequency content of closed-loop control and the outer ring controller of phase, realize
Accurate control to each frequency content is controlled by inner loop control device by the output signal after outer ring controller, is solved
Simultaneously when controlling multiple frequency contents, the control effect of each frequency content can interact the problem of coupling, and realize multi-frequency
The accurate control of ingredient combined waveform.
Preferably, the current waveform instantaneous value tracing control is triangle wave method for tracing, comprising the following steps:
Step D1. is instruction currentWith the electric current i of inverter circuit reality outputLIt is compared, finds out offset current；
Step D2. generates triangular wave by three-phase triangular wave generator；
Step D3. offset current is compared after being amplified by amplifier A with triangular wave, generates output signal d.
Triangular-wave generator is equipped in inner loop control device, by operational amplifier C by the triangular wave of triangular-wave generator with
Amplified outer ring controller output signal compares, and the pwm signal of generation is the output signal d of inner loop control device, triangular wave
Compare that method for tracing switching frequency is certain, more serious noise caused by avoiding frequency from being not fixed.
It can be used for mending simultaneously the invention has the benefit that the output end of current transformer is electrically connected with LCL output filter network
The harmonic current of multiple frequency contents is repaid, the outer ring of control system is provided with the amplitude and phase of each frequency content of closed-loop control
Outer ring controller, realize the accurate control to each frequency content, passed through by the output signal after outer ring controller interior
Ring controller control, when solving while controlling multiple frequency contents, the control effect of each frequency content can interact coupling
The problem of conjunction, realizes the accurate control of multi-frequency ingredient combined waveform.
Detailed description of the invention
The present invention will be further described for attached drawing, but the content in attached drawing does not constitute any limitation of the invention.
Fig. 1 is the control system architecture schematic diagram of the one of embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the outer ring controller of the one of embodiment of the present invention；
Fig. 3 is the control schematic diagram of the n-th frequency content controller of the one of embodiment of the present invention；
Fig. 4 is the control schematic diagram of the inner loop control device of the one of embodiment of the present invention.
Wherein, current transformer 11, LCL output filter network 12, inner loop control device 3, outer ring controller 4, phase lock circuitry PLL,
DET module 41, frequency content controller 42, IDET module 43, summation module 44, triangular-wave generator 31, amplifier A, operation
Amplifier C, diode 32, triode 33, power supply Ud.
Specific embodiment
With reference to the accompanying drawing 1~3 and pass through specific embodiment to further illustrate the technical scheme of the present invention.
The present embodiment a kind of active filter output electric current control system, which is characterized in that including current transformer 11,
LCL exports filter network 12, inner loop control device 3 and outer ring controller 4；
The exchange side of the current transformer 11 and the LCL output filter network 12 are electrically connected, the inner loop control device 3 it is anti-
Feedback signal input terminal is electrically connected with the output end of the current transformer 11, the signal input part of the inner loop control device 3 and described outer
The output end of ring controller 4 is electrically connected, and the output end of the inner loop control device 3 and the signal input part of the current transformer 11 are electrically connected
It connects, the feedback signal input terminal of the outer ring controller 4 is electrically connected with the input terminal of LCL output filter network 12, described
The signal input part of outer ring controller 4 is electrically connected with the output end of LCL output filter network 12；
The outer ring controller 4 includes phase lock circuitry PLL, multiple DET modules 41, multiple frequency content controllers 42, more
A IDET module 43 and a summation module 44, the input terminal of the phase lock circuitry PLL and LCL output filter network 12
Output end electrical connection, the output end of the phase lock circuitry PLL respectively with multiple DET modules 41 and multiple IDET modules
43 are electrically connected one by one, and the output end of each DET module 41 is respectively inputted with the feedback signal of a frequency content controller 42
End electrical connection, input terminal of the output end of each frequency content controller 42 respectively with an IDET module 43 are electrically connected
It connects, the output end of all IDET modules 43 is electrically connected with the input terminal of the summation module 44, the summation module 44
Output end be electrically connected with the input terminal of the inner loop control device 3.
DET module 41 is used to carry out Fourier transformation to the output signal of LCL output filter network 12, and IDET module 43 is used
Fourier inversion is carried out in the output signal to frequency content controller 42, phase lock circuitry PLL is for providing Fourier transformation
With sine required for Fourier inversion and cosine parameter.
The output end of current transformer 11 is electrically connected with LCL output filter network 12 can be used for compensating multiple frequency contents simultaneously
Harmonic current, the outer ring of control system are provided with the amplitude of each frequency content of closed-loop control and the outer ring controller 4 of phase, real
Show the accurate control to each frequency content, controlled by the output signal after outer ring controller 4 by inner loop control device 3,
When solving while controlling multiple frequency contents, the control effect of each frequency content can interact the problem of coupling, and realize
The accurate control of multi-frequency ingredient combined waveform.
The frequency content controller 42 is PI controller, and multiple frequency content controllers 42 are followed successively by fundamental wave control
Device and 2~nth harmonic controller, the proportional control factor of 2~nth harmonic controller control amplitude are as follows:
Kp1n=Kp11/n0.5；
The integral coefficient of 2~nth harmonic controller control amplitude are as follows:
Kiln=Ki11/n0.5；
The proportionality coefficient of 2~nth harmonic controller control phase are as follows:
Kp2n=Kp21；
The integral coefficient of 2~nth harmonic controller control phase are as follows:
Ki2n=Ki21。
Frequency content controller 42 controls the amplitude and phase of multiple frequency contents, is controlled by the way that each frequency content is arranged
The proportional control factor of the control amplitude of device 42, the proportionality coefficient for controlling phase, controls phase at the integral coefficient for controlling amplitude
Integral coefficient is to control the integral coefficient and proportionality coefficient of frequency content controller 42.
The ratio control system of proportionality coefficient and the phase controlling to fundamental wave component that the fundamental wave controller controls amplitude
Number is equal,
Kp11=Kp21；
The integral coefficient phase of integral coefficient and the phase controlling to fundamental wave component that the fundamental wave controller controls amplitude
Deng,
Ki11=Ki21。
In the control of fundamental wave component, the parameter of fundamental wave component be set as to amplitude control proportionality coefficient and to fundamental wave at
The proportional control factor for the phase controlling divided is equal, and to the integral coefficient of amplitude control and to the phase controlling of fundamental wave component
Integral coefficient it is equal.
The inner loop control device 3 include triangular-wave generator 31, amplifier A, operational amplifier C, two diode D1,
The output end electricity of D2, two triodes Q1, Q2 and power supply Ud, the signal input part of the amplifier A and the outer ring controller 4
Connection, the feedback signal input terminal of the amplifier A are electrically connected with the output end of the current transformer 11, the operational amplifier C
Non-inverting input terminal be electrically connected with the output end of the amplifier A, the inverting input terminal of the operational amplifier C and the triangle
The output end of wave producer 31 is electrically connected, and the output end of the operational amplifier C is electric with the base stage of described triode Q1, Q2 respectively
Connection, the emitter of the triode Q1 signal input part with the collector of the triode Q2 and the current transformer 31 respectively
The anode of electrical connection, described diode D1, D2 is electrically connected with the emitter of described triode Q1, Q2 respectively, the diode D1,
The cathode of D2 is electrically connected with the collector of described triode Q1, Q2, the current collection of the anode and the triode Q1 of the power supply Ud
Pole electrical connection, cathode are electrically connected with the emitter of the triode Q2.
Triangular-wave generator 31 is equipped with proportional integration characteristic and is used for outer ring controller for triangular wave, amplifier A to occur
The enhanced processing of output signal, operational amplifier C are used for the amplified output signal of comparison amplifier and triangular signal, power supply
Ud is used to provide power supply for two triodes 33.
The control method of single-phase active power filter output electric current, comprising the following steps:
Step A. data sampling acquires the grid side electric current i of current transformer 11GFor the feedback signal of outer ring controller 4, to become
The grid side for flowing device 11 exports electric currentFor the input signal of outer ring controller 4, pass through the signal after the calculating of outer ring controller 4
For the input signal of inner loop control device 3, inner loop control device 3 is to sample 11 side electric current i of current transformerLFor feedback signal, with generation
It is output signal, the output voltage v of driving logic d control current transformer 11 that current transformer 11, which drives logical signal d,L, current transformer 11 is defeated
Voltage v outLWith network voltage vGIt is acted on LCL output filter network 12 simultaneously, electric current i required for generatingG；
The control of step B. locking phase, the sinusoidal, cosine signal synchronous with needed for IDFT module 42 of DFT block 41 is by network voltage
vGBy being obtained after phase lock circuitry PLL；
Step C. outer loop control, 11 current on line side signal i of current transformerG(t) pass through DET module after entering outer ring controller 4
Multiple frequency content I are resolved into after 41 progress Fourier transformations1(m)~In(m), the output electric current of grid sideEnter outer ring
Multiple frequency contents are resolved into after controller 4I1(m)~In(m) each frequency content is by width
Value Amp (InAnd phase Ang (I (m))n(m)) two variable compositions,Each frequency content by
AmplitudeAnd phaseTwo variable compositions, to I1(m)~In(m) every
Amplitude Amp (the I of a frequency contentnAnd phase Ang (I (m))n(m)) andAmplitudeAnd phaseIt respectively corresponds and is closed by multiple frequency content controllers 42
Ring control, will be respectively S by the output signal of each frequency content after frequency content controller 421(m)~SnIt (m), will be defeated
Signal S out1(m)~Sn(m) by being added after the progress Fourier inversion of IDFT module 43 by summation module 44, outer ring is generated
The output signal of controller 4
Step D. inner loop control, the output signal of outer ring controller 4Current waveform electric current is used by inner loop control device 3
Waveform instantaneous value tracing control, output logic signal d；
Step E. output signal, logical signal d are output in current transformer, control the output voltage v of current transformerL。
The output end of current transformer 11 is electrically connected with LCL output filter network 12 can be used for compensating multiple frequency contents simultaneously
Harmonic current, the outer ring of control system are provided with the amplitude of each frequency content of closed-loop control and the outer ring controller 4 of phase, real
Show the accurate control to each frequency content, controlled by the output signal after outer ring controller 4 by inner loop control device 3,
When solving while controlling multiple frequency contents, the control effect of each frequency content can interact the problem of coupling, and realize
The accurate control of multi-frequency ingredient combined waveform.
The current waveform instantaneous value tracing control is triangle wave method for tracing, comprising the following steps:
Step D1. is instruction currentWith the electric current i of inverter circuit reality outputLIt is compared, finds out offset current；
Step D2. generates triangular wave by three-phase triangular wave generator 31；
Step D3. offset current is compared after being amplified by amplifier A with triangular wave, generates output signal d.
Triangular-wave generator 31 is equipped in inner loop control device 3, by operational amplifier C by the triangular wave of triangular-wave generator
Compared with amplified 4 output signal of outer ring controller, the pwm signal of generation is the output signal d of inner loop control device 3, and three
Angle Bobbi is certain compared with method for tracing switching frequency, more serious noise caused by avoiding frequency from being not fixed.
The technical principle of the invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, the technology of this field
Personnel can associate with other specific embodiments of the invention without creative labor, these modes are fallen within
Within protection scope of the present invention.
Claims (6)
1. a kind of control system of active filter output electric current, which is characterized in that including current transformer, LCL output filter network,
Inner loop control device and outer ring controller；
The exchange side of the current transformer is electrically connected with LCL output filter network, and the feedback signal of the inner loop control device is defeated
Enter end to be electrically connected with the output end of the current transformer, the signal input part of the inner loop control device is defeated with the outer ring controller
Outlet electrical connection, the output end of the inner loop control device are electrically connected with the signal input part of the current transformer, the outer loop control
The feedback signal input terminal of device is electrically connected with the input terminal of LCL output filter network, and the signal of the outer ring controller is defeated
Enter end to be electrically connected with the output end of LCL output filter network；
The outer ring controller includes phase lock circuitry PLL, multiple DET modules, multiple frequency content controllers, multiple IDET modules
And a summation module, the input terminal of the phase lock circuitry PLL are electrically connected with the output end of LCL output filter network, institute
The output end for stating phase lock circuitry PLL is electrically connected with multiple DET modules and multiple IDET modules one by one respectively, each
The output end of DET module is respectively electrically connected with the feedback signal input terminal of a frequency content controller, each frequency
The output end of composition controllers is respectively electrically connected with the input terminal of an IDET module, the output end of all IDET modules
It is electrically connected with the input terminal of the summation module, the input terminal electricity of the output end of the summation module and the inner loop control device
Connection.
2. a kind of control system of active filter output electric current according to claim 1, which is characterized in that the frequency
Composition controllers are PI controller, and multiple frequency content controllers are followed successively by fundamental wave controller and the control of 2~nth harmonic
Device processed, the proportional control factor of 2~nth harmonic controller control amplitude are as follows:
Kp1n=Kp11/n0.5；
The integral coefficient of 2~nth harmonic controller control amplitude are as follows:
Kiln=Ki11/n0.5；
The proportionality coefficient of 2~nth harmonic controller control phase are as follows:
Kp2n=Kp21；
The integral coefficient of 2~nth harmonic controller control phase are as follows:
Ki2n=Ki21。
3. a kind of control system of active filter output electric current according to claim 2, which is characterized in that the fundamental wave
The proportionality coefficient that controller controls amplitude is equal with the proportional control factor of the phase controlling to fundamental wave component,
Kp11=Kp21；
The integral coefficient that the fundamental wave controller controls amplitude is equal with the integral coefficient of the phase controlling to fundamental wave component,
Ki11=Ki21。
4. a kind of control system of active filter output electric current according to claim 1, which is characterized in that the inner ring
Controller 3 includes triangular-wave generator 31, amplifier A, operational amplifier C, two diode D1, D2, two triodes Q1, Q2
And power supply Ud, the signal input part of the amplifier A are electrically connected with the output end of the outer ring controller 4, the amplifier A's
Feedback signal input terminal is electrically connected with the output end of the current transformer 11, the non-inverting input terminal of the operational amplifier C with it is described
The output end of amplifier A is electrically connected, the output end of the inverting input terminal of the operational amplifier C and the triangular-wave generator 31
Electrical connection, the output end of the operational amplifier C are electrically connected with the base stage of described triode Q1, Q2 respectively, the triode Q1
Emitter be electrically connected respectively with the signal input part of the collector of the triode Q2 and the current transformer 31, the diode
The anode of D1, D2 are electrically connected with the emitter of described triode Q1, Q2 respectively, the cathode of described diode D1, D2 and described three
The collector of pole pipe Q1, Q2 is electrically connected, and the anode of the power supply Ud is electrically connected with the collector of the triode Q1, cathode and institute
State the emitter electrical connection of triode Q2.
5. a kind of control method of active filter output electric current, which is characterized in that described in any item including claim 1-4
The control system of active filter output electric current, comprising the following steps:
Step A. data sampling acquires the grid side electric current i of current transformerGFor the feedback signal of outer ring controller, with the electricity of current transformer
Net side exports electric currentSignal for the input signal of outer ring controller, after being calculated by outer ring controllerFor inner loop control
The input signal of device, inner loop control device is to sample current transformer side electric current iLFor feedback signal, logic is driven with the current transformer of generation
Signal d is output signal, the output voltage v of driving logic d control current transformerL, current transformer output voltage vLWith network voltage vGTogether
When act on LCL output filter network, electric current i required for generatingG；
The control of step B. locking phase, DFT block sinusoidal, cosine signal synchronous with needed for IDFT module is by network voltage vGPass through lock
It is obtained after circuitry phase PLL；
Step C. outer loop control, current transformer current on line side signal iG(t) it is carried out in Fu after entering outer ring controller by DET module
Multiple frequency content I are resolved into after leaf transformation1(m)~In(m), the output electric current of grid sideInto after outer ring controller
Resolve into multiple frequency contentsI1(m)~In(m) each frequency content is by amplitude Amp (In
And phase Ang (I (m))n(m)) two variable compositions,Each frequency content by amplitudeAnd phaseTwo variable compositions, to I1(m)~In(m) each frequency
Amplitude Amp (the I of rate ingredientnAnd phase Ang (I (m))n(m)) andAmplitudeAnd phaseIt respectively corresponds through multiple frequency content controller closed loops
Control, will be respectively S by the output signal of each frequency content after frequency content controller1(m)~Sn(m), output is believed
Number S1(m)~Sn(m) by being added after IDFT module progress Fourier inversion by summation module, outer ring controller is generated
Output signal
Step D. inner loop control, the output signal i of outer ring controller* LCurrent waveform current waveform wink is used by inner loop control device
Duration tracing control, output logic signal d；
Step E. output signal, logical signal d are output in current transformer, control the output voltage v of current transformerL。
6. a kind of control method of active filter output electric current according to claim 5, which is characterized in that the electric current
Waveform instantaneous value tracing control is triangle wave method for tracing, comprising the following steps:
Step D1. is instruction currentWith the electric current i of inverter circuit reality outputLIt is compared, finds out offset current；
Step D2. generates triangular wave by three-phase triangular wave generator；
Step D3. offset current is compared after being amplified by amplifier A with triangular wave, generates output signal d.
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| CN115632400A (en) * | 2022-10-22 | 2023-01-20 | 国网山东省电力公司日照供电公司 | Harmonic suppression method for satellite time service synchronous power distribution transformer area inverter |
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| CN115632400A (en) * | 2022-10-22 | 2023-01-20 | 国网山东省电力公司日照供电公司 | Harmonic suppression method for satellite time service synchronous power distribution transformer area inverter |
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