CN105490276A - Active filter and control method thereof - Google Patents
Active filter and control method thereof Download PDFInfo
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- CN105490276A CN105490276A CN201610056463.9A CN201610056463A CN105490276A CN 105490276 A CN105490276 A CN 105490276A CN 201610056463 A CN201610056463 A CN 201610056463A CN 105490276 A CN105490276 A CN 105490276A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of 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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides an active filter. The active filter includes an active filter power circuit connected with a load in parallel and used for compensating the load with harmonic wave currents, and also a an active filter control circuit connected to the active filter power circuit. The active filter control circuit includes a resonance determination device, a current controller and a damping coefficient selector. The resonance determination device determines whether resonance occurs between the active filter and the load, drive instructions are obtained by multiplying a second damping coefficient generated by the damping coefficient selector by amplitudes of harmonic waves if the resonance occurs so that a drive instruction at a resonant frequency is quickly minimized, and then a signal generation circuit is driven to generate drive signals that drive the active filter power circuit to produce compensation currents. Resonance between the active filter and the load can be quickly inhibited while harmonic wave compensation is provided, the stability of a system is improved, and the compensation effect of the active filter is improved. Moreover, the active filter has the advantages of great universality and flexible application.
Description
Technical field
The present invention relates to a kind of active filter, also include the control method of source filter.
Background technology
Multiple load device is connected with in electric power public network, wherein load device is nonlinear load greatly, nonlinear load can produce the frequency harmonic current different from work frequency in running, harmonic current enters in public network can produce harmonic pollution, other power consumption equipment is impacted and damaged, the utilization ratio of electric energy reduces as made, device of overheating of electrical, electric component useful life shortens.Therefore in order to reduce harmonic pollution, the harmonic current to nonlinear load produces is needed to compensate.
Existing technical scheme is the two ends parallel active filter at nonlinear load: after Active Power Filter-APF detects harmonic current, produce the offset current identical with harmonic current, phase place is contrary, offset current and harmonic current offset in public network main circuit, thus reach the object of harmonic carcellation electric current.But for existing active filter, when comprising capacitive component in the electric current of load circuit, Active Power Filter-APF may with load generation resonance, impact filter wave stability and harmonic wave eradicating efficacy.In prior art, mainly install tuning reactor to the technical measures that resonance current is taked, change the resonance frequency of whole Circuits System to avoid occurring resonance, but be subject to the restriction of site environment, installation tuning reactor cost is higher, difficulty is larger.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of Active Power Filter-APF and control method thereof, while compensation harmonic electric current, suppress active filter and load generation resonance.
Technical scheme of the present invention is as follows:
A kind of active filter, comprise for being in parallel with load and be the active filter power circuit of load compensation harmonic current and the Active Power Filter Control Circuit that is connected with active filter power circuit, described Active Power Filter Control Circuit comprises the drive singal circuit for generating be connected with active filter power circuit, and described Active Power Filter Control Circuit also comprises resonance determinant.
Further: described Active Power Filter Control Circuit also comprises the damping coefficient selector be connected with resonance determinant, described damping coefficient selector is connected with arithmetic unit.
Further: described damping coefficient selector has selector switch, described selector switch has first input end, the second input, output and control end, and the control end of described selector switch is connected with resonance determinant.
Further: described Active Power Filter Control Circuit also comprises the current controller that is connected with resonance determinant and for detecting the Harmonic currents detection device that active filter power circuit electric current is connected with load circuit current and with current controller, described Harmonic currents detection device is also connected with arithmetic unit with active filter power circuit.
Further: described Harmonic currents detection device comprises the load current detection device in the offset current checkout gear be arranged in active filter power circuit and the load circuit being arranged on generation harmonic wave, described Harmonic currents detection device also comprise there is positive input terminal, negative input end and difference output ask difference operation circuit, the described positive input terminal of difference operation circuit of asking is connected with the output of load current detection device, and negative input end is connected with the output of offset current checkout gear;
Described Harmonic currents detection device also comprises Fourier transform calculator, and the input of described Fourier transform calculator is connected with asking the difference output of difference operation circuit;
The output of described Fourier transform calculator is connected with arithmetic unit.
Further: described current controller is ratio resonant controller, described ratio resonant controller comprises proportional component and resonant element, described ratio resonant controller also comprises the summation operation device with two input ports and a delivery outlet, an input port of described summation operation device is connected with the output port of proportional component, another input port is connected with the output port of resonant element, and the delivery outlet of described summation operation device is connected with resonance determinant; The input of described resonant element is connected with Fourier transform calculator output.
Further: the proportional component of described ratio resonant controller is low pass filter.
Further: the transfer function of the resonant element of described ratio resonant controller is
wherein ω ' is the angular frequency of jth subharmonic, ω
0for the first-harmonic angular frequency of system.
Further: the proportional component of described ratio resonant controller is low pass filter;
The output of described Fourier transform calculator is also connected with low pass filter by effective value calculator one; The output of described low pass filter is connected with damping coefficient selector.
Further: the proportional component of described ratio resonant controller is low pass filter;
The output of described Fourier transform calculator is also connected with damping coefficient selector by effective value calculator three; The described difference output of difference operation circuit of asking is connected with low pass filter with effective value calculator two by filter successively.
Further: described arithmetic unit is connected with inverse Fourier transformer, the output of described inverse Fourier transformer is connected with drive singal circuit for generating.
Further: the outputting inductance that described active filter power circuit comprises full bridge inverter and is in series with full bridge inverter, described full bridge inverter two ends are also parallel with electric capacity; Described full bridge inverter is connected with drive singal circuit for generating.
The invention also discloses a kind of control method of active filter, comprise the steps:
(A) electric current of active filter power circuit and the electric current of load circuit is detected;
(B) difference between the electric current of active filter power circuit and the electric current of load circuit is calculated;
(C) Fourier transform is carried out to the difference that step (B) calculates, calculate the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave;
(D) current controller calculates Current Control target according to the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave;
(E) Current Control target and threshold values compare by resonance determinant, if Current Control target is more than or equal to threshold values, are then judged to be it is resonance condition, if Current Control target is less than threshold values, are then judged to be non-resonant condition;
(F) damping coefficient selector selects damping coefficient, if non-resonant condition then selects the first damping coefficient, if resonance condition then selects the second damping coefficient according to the result of determination of resonance determinant;
(G) damping coefficient is multiplied with the amplitude of each harmonic obtains driving instruction;
(H) carry out inverse Fourier transform to driving instruction, then drive singal circuit for generating produces the drive singal driving active filter power circuit to produce offset current according to inverse Fourier transform result.
Further: described first damping coefficient is 1.
Further: described second damping coefficient is the end value of a damping coefficient function relevant to low pass filter output valve, the end value of described damping coefficient function increases with low pass filter output valve and to reduce and this end value is greater than zero.
Further: described damping coefficient function is an exponential function, the index of described exponential function equals low pass filter output valve and a negative natural product, and the truth of a matter of described exponential function is a positive natural number.
Further: the truth of a matter of described exponential function is natural Exponents e.
Further: described damping coefficient function is power function, the truth of a matter of described power function is the product of low pass filter output valve and a positive natural constant, and the index of described power function is a negative natural number.
The invention also discloses the control method of another kind of active filter, comprise the steps:
(A) electric current of active filter power circuit and the electric current of load circuit is detected;
(B) difference between the electric current of active filter power circuit and the electric current of load circuit is calculated;
(C) Fourier transform is carried out to the difference that step (B) calculates, calculate the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave effective value, and calculate the effective value of difference;
(D) current controller calculates Current Control target according to the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and difference;
(E) Current Control target and threshold values compare by resonance determinant, if Current Control target is more than or equal to threshold values, are then judged to be it is resonance condition, if Current Control target is less than threshold values, are then judged to be non-resonant condition;
(F) damping coefficient selector selects damping coefficient, if non-resonant condition then selects the first damping coefficient, if resonance condition then selects the second damping coefficient according to the result of determination of resonance determinant;
(G) damping coefficient is multiplied with the amplitude of each harmonic obtains driving instruction;
(H) carry out inverse Fourier transform to driving instruction, then drive singal circuit for generating produces the drive singal driving active filter power circuit to produce offset current according to inverse Fourier transform result.
Further: described first damping coefficient is 1.
Further: described second damping coefficient is the end value of a damping coefficient function relevant to harmonic wave effective value, the end value of described damping coefficient function increases with harmonic wave effective value and to reduce and this end value is greater than zero.
Further: described damping coefficient function is an exponential function, the index of described exponential function equals harmonic wave effective value and a negative natural product, and the truth of a matter of described exponential function is a positive natural number.
Further: the truth of a matter of described exponential function is natural Exponents e.
Further: described damping coefficient function is power function, the truth of a matter of described power function is the product of harmonic wave effective value and a positive natural constant, and the index of described power function is a negative natural number.
Relative to prior art, the present invention has following good effect: when (1) active filter and load generation resonance, active filter of the present invention can produce the second damping coefficient according to resonance effective value, then the second damping coefficient is multiplied with the amplitude of each harmonic and obtains driving instruction, reduce the driving instruction at resonance frequency place fast, control the compensation that active filter stops export resonance frequency place fast, thus active filter and load generation resonance can be suppressed fast while harmonic compensation is provided, improve the stability of system and the compensation effect of active filter, (2) second damping coefficients increase with resonance effective value and reduce, thus suppress resonance according to resonance size, further increase inhibition, (3) can be set resonance frequency by the parameter in change resonant element, have that versatility is good, the advantage of applying flexible.
Accompanying drawing explanation
Fig. 1 is that the active filter power circuit of active filter in specific embodiment 1 is in parallel with load and be connected into the overall structure schematic diagram after in alternating current circuit.
Fig. 2 is that the active filter power circuit of active filter in specific embodiment 2 is in parallel with load and be connected into the overall structure schematic diagram after in alternating current circuit.
Fig. 3 is the structural representation of full bridge inverter in the present invention.
Embodiment
Technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
A kind of active filter, comprises for being in parallel with load and is the active filter power circuit of load compensation harmonic current and the Active Power Filter Control Circuit that is connected with active filter power circuit;
Described active filter power circuit comprises full bridge inverter, output inductor and DC energy storage electric capacity, described DC energy storage electric capacity is connected to the DC terminal of described switching circuit, described output inductor is connected in parallel on the ac output end of described full bridge inverter, the offset current that described full bridge inverter exports is incorporated to load circuit, for its compensation harmonic, reach the object of filtering appts harmonic wave; Full bridge inverter is connected with drive singal circuit for generating; As Fig. 3, described full bridge inverter is switching circuit, and the direct current energy inversion of DC energy storage electric capacity can be offset current by it, and interchange also can be utilized to be input as described DC energy storage capacitor charging.
Described Active Power Filter Control Circuit comprises the drive singal circuit for generating be connected with active filter power circuit, also comprises resonance determinant and damping coefficient selector; Described damping coefficient selector has selector switch, described selector switch has first input end, the second input, output and control end, the control end of described selector switch is connected with resonance determinant, and the output of described damping coefficient selector is connected with arithmetic unit; Described arithmetic unit is connected with inverse Fourier transformer, and the output of described inverse Fourier transformer is connected with drive singal circuit for generating.
Described Active Power Filter Control Circuit also comprises the Harmonic currents detection device for detecting active filter power circuit electric current and load circuit current.
As Fig. 1 or 2, described Harmonic currents detection device comprises the offset current checkout gear 2 be arranged in active filter power circuit and the load current detection device 1 be arranged in the load circuit of generation harmonic wave, described Harmonic currents detection device also comprise there is positive input terminal, negative input end and difference output ask difference operation circuit 3, the described positive input terminal of difference operation circuit 3 of asking is connected with the output of load current detection device 1, and negative input end is connected with the output of offset current checkout gear 2;
Described Harmonic currents detection device also comprises Fourier transform calculator, and the input of described Fourier transform calculator is connected with asking the difference output of difference operation circuit 3;
The output of described Fourier transform calculator is connected with arithmetic unit.
As Fig. 1 or 2, described Active Power Filter Control Circuit also comprises current controller, described current controller is ratio resonant controller, described ratio resonant controller comprises proportional component and resonant element, described ratio resonant controller also comprises the summation operation device 4 with two input ports and a delivery outlet, an input port of described summation operation device 4 is connected with the output port of proportional component, another input port is connected with the output port of resonant element, and the delivery outlet of described summation operation device 4 is connected with resonance determinant; The input of described resonant element is connected with Fourier transform calculator output;
The proportional component of described ratio resonant controller is low pass filter;
The transfer function of the resonant element of described ratio resonant controller is
wherein ω ' is the angular frequency of jth subharmonic, ω
0for the first-harmonic angular frequency of system.
Specific embodiment one:
As Fig. 1, the output of described Fourier transform calculator is also connected with low pass filter by effective value calculator one; The output of described low pass filter is connected with damping coefficient selector.
The control method of this active filter is as follows:
(A) offset current checkout gear 2 and load current detection device 1 detect the electric current of active filter power circuit ip and the current i o of load circuit respectively;
(B) difference operation circuit 3 is asked to calculate difference △ i between the current i p of active filter power circuit and the electric current of load circuit io;
(C) Fourier transform calculator carries out Fourier transform to the difference △ i that step (B) calculates, and calculates the real axis value a of each harmonic component
jR, imaginary axis value a
jIwith angular frequency ' and the effective value of harmonic wave;
(D) current controller calculates Current Control target according to the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave;
(E) Current Control target and threshold values compare by resonance determinant, if Current Control target is more than or equal to threshold values, are then judged to be it is resonance condition, if Current Control target is less than threshold values, are then judged to be non-resonant condition;
(F) damping coefficient selector selects damping coefficient, if non-resonant condition then selects the first damping coefficient, if resonance condition then selects the second damping coefficient according to the result of determination of resonance determinant;
Described first damping coefficient is 1;
Described second damping coefficient is the end value of an exponential function, and the index of described exponential function equals the product of low pass filter output valve x and a negative natural number-k, and the truth of a matter of described exponential function is natural Exponents e; Or described second damping coefficient is the end value of a power function, the truth of a matter of described power function is the product of the positive natural constant m of low pass filter output valve x and, and the index of described power function is a negative natural number-n;
(G) damping coefficient is multiplied with the amplitude of each harmonic obtains driving instruction i, reduce the driving instruction at resonance frequency place fast, control the compensation that active filter stops export resonance frequency place fast;
(H) carry out inverse Fourier transform to driving instruction, then drive singal circuit for generating produces the drive singal driving active filter power circuit to produce offset current according to inverse Fourier transform result.
Specific embodiment two:
As Fig. 2, the output of described Fourier transform calculator is also connected with damping coefficient selector by effective value calculator three; The described difference output of difference operation circuit 3 of asking is connected with low pass filter with effective value calculator two by filter successively.
The control method of this active filter is as follows:
(A) offset current checkout gear 2 and load current detection device 1 detect the current i p of active filter power circuit and the current i o of load circuit respectively;
(B) the difference △ i between the current i p of active filter power circuit and the current i o of load circuit is calculated;
(C) Fourier transform is carried out to the difference △ i that step (B) calculates, calculate the real axis value a of each harmonic component
jR, imaginary axis value a
jIwith angular frequency ', effective value calculator three calculates harmonic wave effective value, and effective value calculator two calculates the effective value of difference;
(D) current controller calculates Current Control target according to the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and difference;
(E) Current Control target and threshold values compare by resonance determinant, if Current Control target is more than or equal to threshold values, are then judged to be it is resonance condition, if Current Control target is less than threshold values, are then judged to be non-resonant condition;
(F) damping coefficient selector selects damping coefficient, if non-resonant condition then selects the first damping coefficient, if resonance condition then selects the second damping coefficient according to the result of determination of resonance determinant;
Described first damping coefficient is 1;
Described second damping coefficient is the end value of an exponential function, and the index of described exponential function equals the product of harmonic wave effective value y and a negative natural number-k, and the truth of a matter of described exponential function is natural Exponents e; Or described second damping coefficient is the end value of a power function, the truth of a matter of described power function is the product of the positive natural constant p of harmonic wave effective value y and, and the index of described power function is a negative natural number-q;
(G) damping coefficient is multiplied with the amplitude of each harmonic obtains driving instruction i, reduce the driving instruction at resonance frequency place fast, control the compensation that active filter stops export resonance frequency place fast;
(H) carry out inverse Fourier transform to driving instruction, then drive singal circuit for generating produces the drive singal driving active filter power circuit to produce offset current according to inverse Fourier transform result.
Compared with specific embodiment 1, the present embodiment be not by Fourier transform after the effective value of each harmonic export to low pass filter, but export to low pass filter by after direct for the difference △ i between the current i p of active filter power circuit and the current i o of load circuit device and effective value calculator two after filtering, thus achieve Fourier transform calculator and effective value calculator two synchronously calculates, only have and just use effective value calculator three to calculate harmonic wave effective value when resonance determinant determines resonance condition, therefore the amount of calculation of whole control circuit can be reduced, shorten computing time, reduce system delay.
Claims (24)
1. an active filter, comprise for being in parallel with load and be the active filter power circuit of load compensation harmonic current and the Active Power Filter Control Circuit that is connected with active filter power circuit, described Active Power Filter Control Circuit comprises the drive singal circuit for generating be connected with active filter power circuit, it is characterized in that: described Active Power Filter Control Circuit also comprises resonance determinant.
2. active filter as claimed in claim 1, it is characterized in that: described Active Power Filter Control Circuit also comprises the damping coefficient selector be connected with resonance determinant, described damping coefficient selector is connected with arithmetic unit.
3. active filter as claimed in claim 2, it is characterized in that: described damping coefficient selector has selector switch, described selector switch has first input end, the second input, output and control end, and the control end of described selector switch is connected with resonance determinant.
4. the active filter as described in as arbitrary in Claims 2 or 3, it is characterized in that: described Active Power Filter Control Circuit also comprises the current controller that is connected with resonance determinant and for detecting the Harmonic currents detection device that active filter power circuit electric current is connected with load circuit current and with current controller, described Harmonic currents detection device is also connected with arithmetic unit with active filter power circuit.
5. active filter as claimed in claim 4, it is characterized in that: described Harmonic currents detection device comprises the load current detection device (1) in the offset current checkout gear (2) be arranged in active filter power circuit and the load circuit being arranged on generation harmonic wave, described Harmonic currents detection device also comprises and has positive input terminal, negative input end and difference output ask difference operation circuit (3), the described positive input terminal of difference operation circuit (3) of asking is connected with the output of load current detection device (1), negative input end is connected with the output of offset current checkout gear (2),
Described Harmonic currents detection device also comprises Fourier transform calculator, and the input of described Fourier transform calculator is connected with asking the difference output of difference operation circuit (3);
The output of described Fourier transform calculator is connected with arithmetic unit.
6. active filter as claimed in claim 5, it is characterized in that: described current controller is ratio resonant controller, described ratio resonant controller comprises proportional component and resonant element, described ratio resonant controller also comprises the summation operation device (4) with two input ports and a delivery outlet, an input port of described summation operation device (4) is connected with the output port of proportional component, another input port is connected with the output port of resonant element, and the delivery outlet of described summation operation device (4) is connected with resonance determinant; The input of described resonant element is connected with Fourier transform calculator output.
7. active filter as claimed in claim 6, is characterized in that: the proportional component of described ratio resonant controller is low pass filter.
8. active filter as claimed in claims 6 or 7, is characterized in that: the transfer function of the resonant element of described ratio resonant controller is
wherein ω ' is the angular frequency of jth subharmonic, ω
0for the first-harmonic angular frequency of system.
9. active filter as claimed in claim 8, is characterized in that: the proportional component of described ratio resonant controller is low pass filter;
The output of described Fourier transform calculator is also connected with low pass filter by effective value calculator one; The output of described low pass filter is connected with damping coefficient selector.
10. active filter as claimed in claim 8, is characterized in that: the proportional component of described ratio resonant controller is low pass filter;
The output of described Fourier transform calculator is also connected with damping coefficient selector by effective value calculator three; The described difference output of difference operation circuit (3) of asking is connected with low pass filter with effective value calculator two by filter successively.
11. active filters as described in Claims 2 or 3 or 5 or 6 or 7 or 9 or 10, it is characterized in that: described arithmetic unit is connected with inverse Fourier transformer, the output of described inverse Fourier transformer is connected with drive singal circuit for generating.
12. active filters as described in claim 1 or 2 or 3 or 5 or 6 or 7 or 9 or 10, it is characterized in that: the outputting inductance that described active filter power circuit comprises full bridge inverter and is in series with full bridge inverter, described full bridge inverter two ends are also parallel with electric capacity; Described full bridge inverter is connected with drive singal circuit for generating.
The control method of 13. 1 kinds of active filters, is characterized in that comprising the steps:
(A) electric current of active filter power circuit and the electric current of load circuit is detected;
(B) difference between the electric current of active filter power circuit and the electric current of load circuit is calculated;
(C) Fourier transform is carried out to the difference that step (B) calculates, calculate the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave;
(D) current controller calculates Current Control target according to the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave;
(E) Current Control target and threshold values compare by resonance determinant, if Current Control target is more than or equal to threshold values, are then judged to be it is resonance condition, if Current Control target is less than threshold values, are then judged to be non-resonant condition;
(F) damping coefficient selector selects damping coefficient, if non-resonant condition then selects the first damping coefficient, if resonance condition then selects the second damping coefficient according to the result of determination of resonance determinant;
(G) damping coefficient is multiplied with the amplitude of each harmonic obtains driving instruction;
(H) carry out inverse Fourier transform to driving instruction, then drive singal circuit for generating produces the drive singal driving active filter power circuit to produce offset current according to inverse Fourier transform result.
The control method of 14. active filters as claimed in claim 13, is characterized in that: described first damping coefficient is 1.
The control method of 15. active filters as described in claim 13 or 14, it is characterized in that: described second damping coefficient is the end value of a damping coefficient function relevant to low pass filter output valve, the end value of described damping coefficient function increases with low pass filter output valve and to reduce and this end value is greater than zero.
The control method of 16. active filters as claimed in claim 15, it is characterized in that: described damping coefficient function is an exponential function, the index of described exponential function equals low pass filter output valve and a negative natural product, and the truth of a matter of described exponential function is a positive natural number.
The control method of 17. active filters as claimed in claim 16, is characterized in that: the truth of a matter of described exponential function is natural Exponents e.
The control method of 18. active filters as claimed in claim 15, it is characterized in that: described damping coefficient function is power function, the truth of a matter of described power function is the product of low pass filter output valve and a positive natural constant, and the index of described power function is a negative natural number.
The control method of 19. 1 kinds of active filters, is characterized in that comprising the steps:
(A) electric current of active filter power circuit and the electric current of load circuit is detected;
(B) difference between the electric current of active filter power circuit and the electric current of load circuit is calculated;
(C) Fourier transform is carried out to the difference that step (B) calculates, calculate the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave effective value, and calculate the effective value of difference;
(D) current controller calculates Current Control target according to the effective value of the real axis value of each harmonic component, imaginary axis value and angular frequency and difference;
(E) Current Control target and threshold values compare by resonance determinant, if Current Control target is more than or equal to threshold values, are then judged to be it is resonance condition, if Current Control target is less than threshold values, are then judged to be non-resonant condition;
(F) damping coefficient selector selects damping coefficient, if non-resonant condition then selects the first damping coefficient, if resonance condition then selects the second damping coefficient according to the result of determination of resonance determinant;
(G) damping coefficient is multiplied with the amplitude of each harmonic obtains driving instruction;
(H) carry out inverse Fourier transform to driving instruction, then drive singal circuit for generating produces the drive singal driving active filter power circuit to produce offset current according to inverse Fourier transform result.
The control method of 20. active filters as claimed in claim 19, is characterized in that: described first damping coefficient is 1.
The control method of 21. active filters as described in claim 19 or 20, it is characterized in that: described second damping coefficient is the end value of a damping coefficient function relevant to harmonic wave effective value, the end value of described damping coefficient function increases with harmonic wave effective value and to reduce and this end value is greater than zero.
The control method of 22. active filters as claimed in claim 21, it is characterized in that: described damping coefficient function is an exponential function, the index of described exponential function equals harmonic wave effective value and a negative natural product, and the truth of a matter of described exponential function is a positive natural number.
The control method of 23. active filters as claimed in claim 22, is characterized in that: the truth of a matter of described exponential function is natural Exponents e.
The control method of 24. active filters as claimed in claim 21, is characterized in that: described damping coefficient function is power function, and the truth of a matter of described power function is the product of harmonic wave effective value and a positive natural constant, and the index of described power function is a negative natural number.
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| CN106300355A (en) * | 2016-09-22 | 2017-01-04 | 电子科技大学 | The resonance control method that a kind of Active Power Filter-APF amount of calculation simplifies |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6297980B1 (en) * | 1999-08-06 | 2001-10-02 | The Regents Of The University Of California | Unified constant-frequency integration control of three-phase power corrected rectifiers, active power filters, and grid-connected inverters |
| CN103069679A (en) * | 2010-08-06 | 2013-04-24 | 株式会社明电舍 | Harmonic current suppression method and harmonic current suppression device of power conversion device |
| CN205335848U (en) * | 2016-01-28 | 2016-06-22 | 烟台东方威思顿电气股份有限公司 | Active filter |
-
2016
- 2016-01-28 CN CN201610056463.9A patent/CN105490276B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6297980B1 (en) * | 1999-08-06 | 2001-10-02 | The Regents Of The University Of California | Unified constant-frequency integration control of three-phase power corrected rectifiers, active power filters, and grid-connected inverters |
| CN103069679A (en) * | 2010-08-06 | 2013-04-24 | 株式会社明电舍 | Harmonic current suppression method and harmonic current suppression device of power conversion device |
| CN205335848U (en) * | 2016-01-28 | 2016-06-22 | 烟台东方威思顿电气股份有限公司 | Active filter |
Non-Patent Citations (1)
| Title |
|---|
| 刘聪: "并联型有源电力滤波器谐波抑制性能优化技术研究", 《万方学位电气工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300355A (en) * | 2016-09-22 | 2017-01-04 | 电子科技大学 | The resonance control method that a kind of Active Power Filter-APF amount of calculation simplifies |
| CN106300355B (en) * | 2016-09-22 | 2018-11-09 | 电子科技大学 | A kind of resonance control method that Active Power Filter-APF calculation amount simplifies |
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