CN205335848U - Active filter - Google Patents
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- CN205335848U CN205335848U CN201620082420.3U CN201620082420U CN205335848U CN 205335848 U CN205335848 U CN 205335848U CN 201620082420 U CN201620082420 U CN 201620082420U CN 205335848 U CN205335848 U CN 205335848U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
Abstract
The utility model provides an active filter, it is parallelly connected and for load compensation harmonic current's active filter power circuit and the active filter control circuit that is connected with active filter power circuit including being used for with the load phase, active filter control circuit still includes resonance determinant, current controller and damping coefficient selector. The resonance determinant can judge that whether active filter has taken place resonance with the load, if take place resonance, the 2nd damping coefficient who then generates the damping coefficient selector multiplies each other with the amplitude of each subharmonic and obtains the drive instruction to reduced the drive instruction of resonant frequency department fast, then drive signal generating circuit produces the drive signal that drive active filter power circuit produced offset current. The utility model discloses active filter and load emergence resonance be can suppress fast when providing harmonic compensation, the stability of system and active filter's compensation effect have been improved to still has the advantage that the commonality is good, use the flexibility.
Description
Technical field
This utility model relates to a kind of active filter。
Background technology
Electric power public network is connected to multiple load device, wherein load device is nonlinear load greatly, nonlinear load can produce the harmonic current that frequency is different from work frequency in running, harmonic current enters in public network can produce harmonic pollution, other electrical equipment is impacted and damages, as made the utilization ratio of electric energy reduce, device of overheating of electrical, electrical equipment shortening in service life etc.。Therefore to minimizing harmonic pollution, it is necessary to the harmonic current that nonlinear load is produced compensates。
Existing technical scheme is the two ends parallel active filter at nonlinear load: after Active Power Filter-APF detects harmonic current, produce compensation electric current identical with harmonic current, opposite in phase, compensate electric current to offset in public network main circuit with harmonic current, thus reaching the purpose 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 with load generation resonance, may affect filter wave stability and harmonic wave eradicating efficacy。In prior art, the technical measures that resonance current is taked mainly install tuning reactor, change the resonant frequency of whole Circuits System to avoid the occurrence of resonance, but by the restriction of site environment, tuning reactor is relatively costly, difficulty is bigger in installation。
Utility model content
Technical problem to be solved in the utility model is to provide a kind of Active Power Filter-APF, suppresses active filter and load generation resonance while compensation harmonic electric current。
The technical solution of the utility model is as follows:
A kind of active filter, including for being in parallel with load and being the active filter power circuit of load compensation harmonic current and the Active Power Filter Control Circuit being connected with active filter power circuit, described Active Power Filter Control Circuit includes the driving signal generating circuit being connected with active filter power circuit, and described Active Power Filter Control Circuit also includes resonance determinant。
Further: described Active Power Filter Control Circuit also includes the damped coefficient selector being connected with resonance determinant, and described damped coefficient selector is connected to arithmetical unit。
Further: described damped coefficient selector has selection switch, and described selection switch has first input end, the second input, outfan and control end, the control end of described selection switch is connected with resonance determinant。
Further: described Active Power Filter Control Circuit also includes the current controller that is connected with resonance determinant and for detecting active filter power circuit electric current and load circuit current the Harmonic currents detection device being connected with current controller, and described Harmonic currents detection device is also connected with active filter power circuit and arithmetical unit。
Further: described Harmonic currents detection device includes the compensation current sensing means being arranged in active filter power circuit and the load current detection device being arranged in the load circuit producing harmonic wave, what described Harmonic currents detection device also included having positive input terminal, negative input end and difference outfan seeks difference operation circuit, described asking the positive input terminal of difference operation circuit to be connected with the outfan of load current detection device, negative input end is connected with the outfan compensating current sensing means；
Described Harmonic currents detection device also includes Fourier transform computer, and the input of described Fourier transform computer is connected with the difference outfan seeking difference operation circuit；
The outfan of described Fourier transform computer was connected with arithmetical unit。
Further: described current controller is ratio resonant controller, described ratio resonant controller includes proportional component and resonant element, described ratio resonant controller also includes the summation operation device with two input ports and a delivery outlet, one 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 computer outfan。
Further: the proportional component of described ratio resonant controller is low pass filter。
Further: the transmission function of the resonant element of described ratio resonant controller isWherein ω ' is the angular frequency of jth subharmonic, ω0First-harmonic angular frequency for system。
Further: the proportional component of described ratio resonant controller is low pass filter；
The outfan of described Fourier transform computer is connected with low pass filter also by virtual value computer one；The outfan of described low pass filter is connected with damped coefficient selector。
Further: the proportional component of described ratio resonant controller is low pass filter；
The outfan of described Fourier transform computer is connected with damped coefficient selector also by virtual value computer three；The described difference outfan seeking difference operation circuit passes sequentially through wave filter and is connected with low pass filter with virtual value computer two。
Further: being connected to inverse Fourier transformer described arithmetical unit, the outfan of described inverse Fourier transformer is connected with driving signal generating circuit。
Further: described active filter power circuit includes full bridge inverter and the outputting inductance being in series with full bridge inverter, and described full bridge inverter two ends are also parallel with electric capacity；Described full bridge inverter is connected with driving signal generating circuit。
Relative to prior art, this utility model has the positive effect that: when (1) active filter and load generation resonance, active filter of the present utility model can produce the second damped coefficient according to resonance virtual value, then the second damped coefficient is multiplied with the amplitude of each harmonic and obtains driving instruction, quickly reduce the driving instruction at resonant frequency place, control active filter and quickly stop the compensation at export resonance frequency place, thus can quickly suppress active filter and load generation resonance while providing harmonic compensation, improve the stability of system and the compensation effect of active filter；(2) second damped coefficients increase with resonance virtual value and reduce, thus resonance being suppressed according to resonance size, further increase inhibition；(3) resonant frequency can be set by changing the parameter in 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 overall structure schematic diagram after being connected 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 overall structure schematic diagram after being connected in alternating current circuit。
Fig. 3 is the structural representation of full bridge inverter in this utility model。
Detailed description of the invention
The technical solution of the utility model is described in detail below in conjunction with accompanying drawing:
A kind of active filter, including for being in parallel with load and being the active filter power circuit of load compensation harmonic current and the Active Power Filter Control Circuit being connected with active filter power circuit；
Described active filter power circuit includes 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 on-off circuit, described output inductor is connected in parallel on the ac output end of described full bridge inverter, the compensation electric current exported by described full bridge inverter is incorporated to load circuit, for its compensation harmonic, reach the purpose of filtering appts harmonic wave；Full bridge inverter is connected with driving signal generating circuit；Such as Fig. 3, described full bridge inverter is on-off circuit, and it can by the direct current energy inversion of DC energy storage electric capacity for compensating electric current, it is also possible to utilize exchange input for the charging of described DC energy storage electric capacity。
Described Active Power Filter Control Circuit includes the driving signal generating circuit being connected with active filter power circuit, also includes resonance determinant and damped coefficient selector；Described damped coefficient selector has selection switch, described selection switch has first input end, the second input, outfan and control end, the described control end selecting switch is connected with resonance determinant, and the outfan of described damped coefficient selector is connected to arithmetical unit；Being connected to inverse Fourier transformer described arithmetical unit, the outfan of described inverse Fourier transformer is connected with driving signal generating circuit。
Described Active Power Filter Control Circuit also includes the Harmonic currents detection device for detecting active filter power circuit electric current and load circuit current。
Such as Fig. 1 or 2, described Harmonic currents detection device includes the compensation current sensing means 2 being arranged in active filter power circuit and the load current detection device 1 being arranged in the load circuit producing harmonic wave, what described Harmonic currents detection device also included having positive input terminal, negative input end and difference outfan seeks difference operation circuit 3, described asking the positive input terminal of difference operation circuit 3 to be connected with the outfan of load current detection device 1, negative input end is connected with the outfan compensating current sensing means 2；
Described Harmonic currents detection device also includes Fourier transform computer, and the input of described Fourier transform computer is connected with the difference outfan seeking difference operation circuit 3；
The outfan of described Fourier transform computer was connected with arithmetical unit。
Such as Fig. 1 or 2, described Active Power Filter Control Circuit also includes current controller, described current controller is ratio resonant controller, described ratio resonant controller includes proportional component and resonant element, described ratio resonant controller also includes the summation operation device 4 with two input ports and a delivery outlet, one 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 computer outfan；
The proportional component of described ratio resonant controller is low pass filter；
The transmission function of the resonant element of described ratio resonant controller isWherein ω ' is the angular frequency of jth subharmonic, ω0First-harmonic angular frequency for system。
Specific embodiment one:
Such as Fig. 1, the outfan of described Fourier transform computer is connected with low pass filter also by virtual value computer one；The outfan of described low pass filter is connected with damped coefficient selector。
The control method of this active filter is as follows:
(A) compensate current sensing means 2 and load current detection device 1 detects the electric current of active filter power circuit ip and the electric current io of load circuit respectively；
(B) difference operation circuit 3 is asked to calculate the difference △ i between the electric current ip of active filter power circuit and the electric current of load circuit io；
(C) the difference △ i that step (B) is calculated by Fourier transform computer carries out Fourier transform, calculates the real axis value a of each harmonic componentjR, imaginary axis value ajIWith angular frequency ' and the virtual value of harmonic wave；
(D) current controller calculates electric current control target according to the virtual value of the real axis value of each harmonic component, imaginary axis value and angular frequency and harmonic wave；
(E) electric current is controlled target and threshold value and compares by resonance determinant, if electric current controls target be more than or equal to threshold value, is then judged to it is resonant condition, if electric current controls target less than threshold value, is then judged to non-resonant condition；
(F) damped coefficient selector selects damped coefficient according to the result of determination of resonance determinant, if non-resonant condition then selects the first damped coefficient, if resonant condition then selects the second damped coefficient；
Described first damped coefficient is 1；
Described second damped coefficient is the end value of an exponential function, and the index of the described exponential function product equal to low pass filter output valve x and one negative natural number-k, the truth of a matter of described exponential function is natural Exponents e；Or, described second damped coefficient is the end value of a power function, and 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 one, and the index of described power function is a negative natural number-n；
(G) damped coefficient is multiplied with the amplitude of each harmonic obtains driving instruction i, quickly reduce the driving instruction at resonant frequency place, control active filter and quickly stop the compensation at export resonance frequency place；
(H) driving instruction is carried out inverse Fourier transform, then drive signal generating circuit to produce the driving signal driving active filter power circuit to produce to compensate electric current according to inverse Fourier transform result。
Specific embodiment two:
Such as Fig. 2, the outfan of described Fourier transform computer is connected with damped coefficient selector also by virtual value computer three；The described difference outfan seeking difference operation circuit 3 passes sequentially through wave filter and is connected with low pass filter with virtual value computer two。
The control method of this active filter is as follows:
(A) compensate current sensing means 2 and load current detection device 1 detects the electric current ip of active filter power circuit and the electric current io of load circuit respectively；
(B) the difference △ i between the electric current ip and the electric current io of load circuit of active filter power circuit is calculated；
(C) the difference △ i that step (B) is calculated carries out Fourier transform, calculates the real axis value a of each harmonic componentjR, imaginary axis value ajIWith angular frequency ', virtual value computer three calculates harmonic wave virtual value, and virtual value computer two calculates the virtual value of difference；
(D) current controller calculates electric current control target according to the virtual value of the real axis value of each harmonic component, imaginary axis value and angular frequency and difference；
(E) electric current is controlled target and threshold value and compares by resonance determinant, if electric current controls target be more than or equal to threshold value, is then judged to it is resonant condition, if electric current controls target less than threshold value, is then judged to non-resonant condition；
(F) damped coefficient selector selects damped coefficient according to the result of determination of resonance determinant, if non-resonant condition then selects the first damped coefficient, if resonant condition then selects the second damped coefficient；
Described first damped coefficient is 1；
Described second damped coefficient is the end value of an exponential function, and the index of the described exponential function product equal to harmonic wave virtual value y and one negative natural number-k, the truth of a matter of described exponential function is natural Exponents e；Or, described second damped coefficient is the end value of a power function, and the truth of a matter of described power function is the product of the positive natural constant p of harmonic wave virtual value y and one, and the index of described power function is a negative natural number-q；
(G) damped coefficient is multiplied with the amplitude of each harmonic obtains driving instruction i, quickly reduce the driving instruction at resonant frequency place, control active filter and quickly stop the compensation at export resonance frequency place；
(H) driving instruction is carried out inverse Fourier transform, then drive signal generating circuit to produce the driving signal driving active filter power circuit to produce to compensate electric current according to inverse Fourier transform result。
Compared with specific embodiment 1, the present embodiment be not by Fourier transform after the virtual value of each harmonic export to low pass filter, but export to low pass filter after the difference △ i between the electric current ip and the electric current io of load circuit of active filter power circuit is directly over wave filter and virtual value computer two, it is achieved thereby that Fourier transform computer and virtual value computer two synchronize to calculate, only just use virtual value computer three to calculate harmonic wave virtual value when resonance determinant determines resonant condition, therefore the amount of calculation of whole control circuit can be reduced, shorten the calculating time, reduce system delay。
Claims (12)
1. an active filter, including for being in parallel with load and being the active filter power circuit of load compensation harmonic current and the Active Power Filter Control Circuit being connected with active filter power circuit, described Active Power Filter Control Circuit includes the driving signal generating circuit being connected with active filter power circuit, it is characterised in that: described Active Power Filter Control Circuit also includes resonance determinant。
2. active filter as claimed in claim 1, it is characterised in that: described Active Power Filter Control Circuit also includes the damped coefficient selector being connected with resonance determinant, and described damped coefficient selector is connected to arithmetical unit。
3. active filter as claimed in claim 2, it is characterized in that: described damped coefficient selector has selection switch, described selection switch has first input end, the second input, outfan and control end, and the control end of described selection 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 includes the current controller that is connected with resonance determinant and for detecting active filter power circuit electric current and load circuit current the Harmonic currents detection device being connected with current controller, and described Harmonic currents detection device is also connected with active filter power circuit and arithmetical unit。
5. active filter as claimed in claim 4, it is characterized in that: compensation current sensing means (2) that described Harmonic currents detection device includes being arranged in active filter power circuit and the load current detection device (1) in being arranged on the load circuit producing harmonic wave, described Harmonic currents detection device also includes having positive input terminal, negative input end and difference outfan seek difference operation circuit (3), described the positive input terminal of difference operation circuit (3) is asked to be connected with the outfan of load current detection device (1), negative input end is connected with the outfan compensating current sensing means (2)；
Described Harmonic currents detection device also includes Fourier transform computer, and the input of described Fourier transform computer is connected with the difference outfan seeking difference operation circuit (3)；
The outfan of described Fourier transform computer was connected with arithmetical 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 includes proportional component and resonant element, described ratio resonant controller also includes the summation operation device (4) with two input ports and a delivery outlet, one 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 computer outfan。
7. active filter as claimed in claim 6, it is characterised in that: the proportional component of described ratio resonant controller is low pass filter。
8. active filter as claimed in claims 6 or 7, it is characterised in that: the transmission function of the resonant element of described ratio resonant controller isWherein ω ' is the angular frequency of jth subharmonic, ω0First-harmonic angular frequency for system。
9. active filter as claimed in claim 8, it is characterised in that: the proportional component of described ratio resonant controller is low pass filter；
The outfan of described Fourier transform computer is connected with low pass filter also by virtual value computer one；The outfan of described low pass filter is connected with damped coefficient selector。
10. active filter as claimed in claim 8, it is characterised in that: the proportional component of described ratio resonant controller is low pass filter；
The outfan of described Fourier transform computer is connected with damped coefficient selector also by virtual value computer three；The described difference outfan seeking difference operation circuit (3) passes sequentially through wave filter and is connected with low pass filter with virtual value computer two。
11. the active filter as described in Claims 2 or 3 or 5 or 6 or 7 or 9 or 10, it is characterised in that: being connected to inverse Fourier transformer described arithmetical unit, the outfan of described inverse Fourier transformer is connected with driving signal generating circuit。
12. the active filter as described in claim 1 or 2 or 3 or 5 or 6 or 7 or 9 or 10, it is characterized in that: described active filter power circuit includes full bridge inverter and the outputting inductance being in series with full bridge inverter, and described full bridge inverter two ends are also parallel with electric capacity；Described full bridge inverter is connected with driving signal generating circuit。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620082420.3U CN205335848U (en) | 2016-01-28 | 2016-01-28 | Active filter |
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| CN201620082420.3U CN205335848U (en) | 2016-01-28 | 2016-01-28 | Active filter |
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| CN205335848U true CN205335848U (en) | 2016-06-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490276A (en) * | 2016-01-28 | 2016-04-13 | 烟台东方威思顿电气股份有限公司 | Active filter and control method thereof |
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- 2016-01-28 CN CN201620082420.3U patent/CN205335848U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490276A (en) * | 2016-01-28 | 2016-04-13 | 烟台东方威思顿电气股份有限公司 | Active filter and control method thereof |
| CN105490276B (en) * | 2016-01-28 | 2017-12-01 | 烟台东方威思顿电气有限公司 | A kind of active filter and its control method |
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Address after: 264003 Laishan City, Yantai province Venture Center, Shandong Co-patentee after: Changzhou Tianman Intelligent Technology Co., Ltd. Patentee after: Yantai Dongfang Wisdom Electric Co., Ltd. Address before: 264003 Laishan City, Yantai province Venture Center, Shandong Co-patentee before: Changzhou Tianman Intelligent Technology Co., Ltd. Patentee before: Yantai Dongfang Wisdom Electronic Co., Ltd. |