CN107611973A - Notch filter for distributed power supply system - Google Patents
Notch filter for distributed power supply system Download PDFInfo
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- CN107611973A CN107611973A CN201710938797.3A CN201710938797A CN107611973A CN 107611973 A CN107611973 A CN 107611973A CN 201710938797 A CN201710938797 A CN 201710938797A CN 107611973 A CN107611973 A CN 107611973A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiments of the invention provide the notch filter for distributed power supply system, belong to filter field, the input of notch filter is connected with inverter controller, the output end of notch filter is connected with inversion wave filter, the input of inverter controller is connected with combining inverter, the output end of inversion wave filter is connected with the grid-connected switch for being turned on and off to distributed power supply system, and the output end of grid-connected switch is connected with power network table；Wherein, notch filter includes resonance circuit, and resonance circuit includes resistance R1, the inductance L1 to be connected with resistance R1 and the electric capacity C1 to be connected with inductance L1, resistance R1 series inductance L1, inductance L1 series capacitances C1.By using the notch filter after improvement, the resonance peak of inversion wave filter is not only inhibited, distributed power supply system stabilization is maintained, also causes distributed power supply system that there is less steady-state error and enough stability margins, improve low-band gain.
Description
Technical field
The invention belongs to filter field, the more particularly to notch filter for distributed power supply system.
Background technology
As energy crisis and environmental pollution are on the rise, the distributed power generation of the renewable sources of energy such as solar energy, wind energy is utilized
Technology is increasingly valued by people.Combining inverter as the interface equipment between distributed power supply system and power network, its
Control performance directly affects the quality of electricity generation system output electric energy, in order to suppress high caused by the work of combining inverter power device
Frequency harmonic wave, the method for present main flow add inversion wave filter between combining inverter and power network, and inversion wave filter is to harmonic high frequency
Ripple has preferable attenuation, thus is used widely.
Because the frequency characteristic of inversion wave filter causes resonance peak at resonant frequency be present, cause distributed power supply system
It is unstable.
The content of the invention
In order to solve shortcoming and defect present in prior art, the invention provides by increasing before notch filter
Inverter controller, the resonance peak of inversion wave filter is not only inhibited, also improves low-band gain, so that distributed power source
The stable notch filter of system.
It is described the invention provides the notch filter for distributed power supply system in order to reach above-mentioned technical purpose
The input of notch filter is connected with inverter controller, and the output end of the notch filter is connected with inversion wave filter, institute
The input for stating inverter controller is connected with combining inverter, and the output end of the inversion wave filter is connected with for distribution
The grid-connected switch that power-supply system is turned on and off, the output end of the grid-connected switch are connected with power network table；
Wherein, the notch filter includes resonance circuit, and the resonance circuit includes resistance R1, is connected with resistance R1
Inductance L1 and the electric capacity C1 to be connected with inductance L1, the resistance R1 series connection inductance L1, the inductance L1 series connection electricity
Hold C1.
Optionally, it is provided with inductance L2 between the grid-connected switch and the power network table.
Optionally, the grid-connected switch includes grid-connected contactor and breaker.
Optionally, the combining inverter is including at least open the light a pipe and a diode, the current collection of the pipe that opens the light
Pole connects the negative pole of diode, the positive pole of the emitter stage connection diode of the pipe that opens the light, the negative or positive electrode of the diode
Connect the input of inverter controller.
Optionally, the inversion wave filter is LCL type wave filter.
Optionally, the inverter controller includes pi controller or ratio resonant controller.
Optionally, the notch filter also includes active single amplifier notch filter or active pair follows notch filter
Device.
Optionally, active single amplifier notch filter has including operational amplifier U1, the operational amplifier U1
Normal phase input end, inverting input, the inverting input of the operational amplifier U1 are connected through resistance R6 with the output end of itself,
The output end of the operational amplifier U1 connects the input of the inversion wave filter, the anti-phase input of the operational amplifier U1
End is grounded through resistance R5, the in-phase input end connection resistance R2 of operational amplifier U1 one end, one end of the resistance R2
Electric capacity C3 one end is also connected with, the other end of the resistance R2 is grounded through electric capacity C5, the resistance R2 series resistances R3, the electricity
The one end for hindering R3 connects the output end of the inverter controller, one end connection electric capacity C4 of resistance R3 one end, the electricity
Hold output end of the C4 other end through the resistance R4 connections operational amplifier U1, the electric capacity C4 series connection electric capacity C3.
Optionally, described active pair follows notch filter to include operational amplifier U2 and operational amplifier U3, the fortune
Calculating the amplifier U2 and operational amplifier U3 all has normal phase input end, inverting input, the operational amplifier U2's
Output end of the inverting input through the resistance R20 connections operational amplifier U2, the output end connection of the operational amplifier U2
Enter the output end of the inversion wave filter, in-phase input end connection the resistance R12, the resistance R12 of the operational amplifier U2
Series resistance R13, output end of the one end of the resistance R13 through the electric capacity C15 connections operational amplifier U3, the resistance
The R13 other end connects the output end of the inverter controller, and the other end of the resistance R13 is also connected with electric capacity C14 one end,
In-phase input end of the other end of the electric capacity C14 through the electric capacity C13 connections operational amplifier U2, the electric capacity C14's is another
Output end of the one end through the resistance R14 connections operational amplifier U3, the output end of the operational amplifier U3 connect through resistance R17
The inverting input of the operational amplifier U3 is connect, the in-phase input end of the operational amplifier U3 is through described in resistance R18 connections
Operational amplifier U2 output end, the in-phase input end of the operational amplifier U3 are grounded through resistance R19.
The beneficial effect that technical scheme provided by the invention is brought is：By using the notch filter after improvement, not only
Inhibit the resonance peak of inversion wave filter, it is stable to maintain distributed power supply system, also cause distributed power supply system have compared with
Small steady-state error and enough stability margins, improve low-band gain.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required accompanying drawing used in being described below to embodiment
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, general for this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation provided by the present invention for the notch filter of distributed power supply system；
Fig. 2 is the circuit connection diagram of notch filter provided by the invention and inversion wave filter；
Fig. 3 is the internal circuit connection figure of notch filter provided by the invention；
Fig. 4 is another internal circuit connection figure of notch filter provided by the invention.
Embodiment
To make the structure of the present invention and advantage clearer, the structure of the present invention is made further below in conjunction with accompanying drawing
Description.
Embodiment one
The invention provides the notch filter for distributed power supply system, the input connection of the notch filter
There is inverter controller, the output end of the notch filter is connected with inversion wave filter, and the input of the inverter controller connects
Combining inverter is connected to, the output end of the inversion wave filter is connected with for being turned on and off to distributed power supply system
Grid-connected switch, the output end of the grid-connected switch is connected with power network table；
Wherein, the notch filter includes resonance circuit, and the resonance circuit includes resistance R1, is connected with resistance R1
Inductance L1 and the electric capacity C1 to be connected with inductance L1, the resistance R1 series connection inductance L1, the inductance L1 series connection electricity
Hold C1.
In force, because inversion wave filter plays greater attenuation effect to high-frequency harmonic electric current, electric current is made with relatively low
Aberration rate is connected to the grid, but resonance peak existing for inversion wave filter can cause distributed power supply system unstable.Therefore, in order to
Ensure that distributed power supply system is stable, as shown in figure 1, the input in inversion wave filter 4 is provided with notch filter 3, trap filter
Ripple device 3 belongs to bandstop filter, can produce negative resonance peak, and the negative resonance peak is used for offsetting the resonance peak of inversion wave filter 4.Such as
Shown in Fig. 2, notch filter 3 includes resonance circuit, and resonance circuit includes resistance R1, inductance L1 and electric capacity C1.In ideal situation
Under, notch filter 3 only has a trap frequency, and the formula of trap frequency is
The trap frequency of notch filter 3 is calculated by the formula, so as to adjust trap frequency and inversion wave filter 4
Resonant frequency is consistent so that the two is cancelled out each other, and then keeps distributed power supply system stable.While in order to ensure distributed electrical
Source system has less steady-state error and enough stability margins, as shown in Fig. 2 in notch filter 3 and combining inverter 1
Between be provided with inverter controller 2, so as to further increasing low-band gain.For the ease of control distributed power supply system
It is turned on and off, grid-connected switch 5 is provided with the output end of inversion wave filter 4,5 is switched through grid-connected in the output end of notch filter
Provided with power network table 6, the power network table 6 is multifunction electric meter, for measuring the output current voltage of combining inverter 1.
Inversion wave filter 4 includes all polymorphic types, conventional inversion wave filter 4 have L-type wave filter, LC mode filters and
LCL type wave filter, inversion wave filter 4 is LCL type wave filter in the present embodiment, is reaching identical high-frequency harmonic inhibition
When, the total inductance amount needed for LCL type wave filter is more much smaller than L-type and LC mode filters.As shown in Fig. 2 inversion wave filter 4 includes
Filter inductance L3, filter inductance L4 and filter capacitor C2, filter inductance L3 one end connection inductance L1 one end, filter inductance L3
Other end connection filter inductance L4 one end, the input of the filter inductance L4 grid-connected switch 5 of other end connection, filter capacitor
The C2 one end connection filter inductance L3 other end, another input of the filter capacitor C2 grid-connected switch 5 of other end connection.
Optionally, it is provided with current-limiting inductance L2 between the grid-connected switch and the power network table.
In force, current-limiting inductance L2 is provided between grid-connected switch 5 and power network table 6, wherein, current-limiting inductance L2 plays logical
The effect of exchange resistance direct current so that the output current of inversion wave filter 4 diminishes, and avoid causes to burn out power network because electric current is excessive
The accident of table 6, and then play a part of protecting power network table 6.
Optionally, the grid-connected switch includes grid-connected contactor and breaker.
In force, grid-connected switch 5 includes grid-connected contactor and breaker, wherein, grid-connected contactor as main protection, and
Breaker realizes grid-connected contactor and breaker while controlled, so as to improve distributed power supply system as back-up protection
Security reliability.Grid-connected contactor is provided with by the input in breaker, and then reduces the action frequency of breaker, with
And the fault rate of breaker is reduced, while decrease because caused by breaker frequent movement the problem of, it ensure that distributed electrical
The safe operation of source system.
Optionally, the combining inverter is including at least open the light a pipe and a diode, the current collection of the pipe that opens the light
Pole connects the negative pole of diode, the positive pole of the emitter stage connection diode of the pipe that opens the light, the negative or positive electrode of the diode
Connect the input of inverter controller.
In force, combining inverter 1 is used for converting direct-current power into alternating-current power, wherein, the present embodiment is parallel network reverse
Device 1 includes open the light a pipe and a diode, wherein, when the pipe that opens the light load for it is perceptual when, and open the light pipe closing that
In a flash, it can not be mutated due to flowing through the electric current of inductive load and will produce an instantaneous high pressure at inductive load both ends, at this
The lower diode current flow of instantaneous pressure effect, in time absorbs instantaneous energy, and the pipe that avoids opening the light is punctured by instantaneous high pressure, thus plays
Protection is opened the light the effect of pipe.
Optionally, the inverter controller includes pi controller or ratio resonant controller.
In force, the effect of inverter controller 2 is to improve low-band gain, reduces the steady-state error of distributed power source.
Wherein, inverter controller 2 includes pi controller or ratio resonant controller.Pi controller and ratio resonance control
I.e. overcome simple proportion adjustment has the shortcomings that steady-state error to device processed, turn avoid simple integral adjustment low-response, dynamic
The shortcomings that performance is bad, therefore be both widely used.
The embodiments of the invention provide the notch filter for distributed power supply system, the input of notch filter connects
Inverter controller is connected to, the output end of notch filter is connected with inversion wave filter, and the input of inverter controller is connected with simultaneously
Net inverter, the output end of inversion wave filter is connected with grid-connected to be opened for what is be turned on and off to distributed power supply system
Close, the output end of grid-connected switch is connected with power network table；Wherein, notch filter includes resonance circuit, and resonance circuit includes resistance
R1, the inductance L1 to be connected with resistance R1 and the electric capacity C1 to be connected with inductance L1, resistance R1 series inductance L1, inductance L1 series connection
Electric capacity C1.By using the notch filter after improvement, the resonance peak of inversion wave filter is not only inhibited, maintains distributed electrical
Source system is stable, also causes distributed power supply system to have less steady-state error and enough stability margins, improves low frequency
Duan Zengyi.
Embodiment two
Previous embodiment proposes the notch filter based on resonance circuit, in addition, notch filter also includes active list
Amplifier notch filter active double follows notch filter.The present embodiment proposes a kind of active single amplifier notch filter.
As shown in figure 3, active single amplifier notch filter includes：
Operational amplifier U1, the operational amplifier U1 have normal phase input end, inverting input, the operational amplifier
U1 inverting input is connected through resistance R6 with the output end of itself, and the output end of the operational amplifier U1 connects the inversion
The input of wave filter, the inverting input of the operational amplifier U1 are grounded through resistance R5, and the operational amplifier U1's is same
Phase input connection resistance R2 one end, one end of the resistance R2 are also connected with electric capacity C3 one end, and the resistance R2's is another
End is grounded through electric capacity C5, and the resistance R2 series resistances R3, the resistance R3 one end connect the output of the inverter controller
End, one end connection electric capacity C4 of resistance R3 one end, the other end of the electric capacity C4 are put through the resistance R4 connections computing
Big device U1 output end, the electric capacity C4 series connection electric capacity C3.
In force, understood according to above-mentioned, notch filter 3 is also known as bandstop filter, for a certain frequency that suppresses or decay
The signal of rate section, and all signals allowed beyond the frequency band pass through.The notch filter 3 of the present embodiment is that active single amplifier is fallen into
Wave filter, it includes low pass filter, high-pass filter and operational amplifier U1.Wherein, the resistance of resistance R2, R3 in Fig. 3
It is worth equal, electric capacity C3, C4 capacitance are equal, and resistance R4 resistance is resistance R2 resistance half, and electric capacity C5 capacitance is
2 times of electric capacity C3 capacitance, resistance R4 is connected to operational amplifier U1 output end, formed only in centre frequency f0Around
Positive feedback, resistance band is reduced, improve selectivity.
In addition, the formula of the centre frequency of active single amplifier notch filter is
The centre frequency f of active single amplifier notch filter is calculated by the formula0, as centre frequency f0Equal to cut-off
Frequency fmWhen, so as to adjust cut-off frequency fmIt is consistent with the resonant frequency of inversion wave filter 4 so that the two is cancelled out each other, Jin Erbao
It is stable to hold distributed power supply system.
The embodiment of the present invention proposes the notch filter for distributed power supply system, and the notch filter is active list
Amplifier notch filter, active single amplifier notch filter include low pass filter, high-pass filter and operational amplifier.Pass through
Using the notch filter after improvement, it is suppressed that the resonance peak of inversion wave filter, it is stable to maintain distributed power supply system.
Embodiment three
The present embodiment propose from another point of view it is a kind of it is active it is double follow notch filter, as shown in figure 4, this it is active it is double with
Include with notch filter：
Operational amplifier U2 and operational amplifier U3, the operational amplifier U2 and the operational amplifier U3 have
Normal phase input end, inverting input, the inverting input of the operational amplifier U2 is through the resistance R20 connections operational amplifier
U2 output end, the output end of the operational amplifier U2 connect the output end into the inversion wave filter, the operation amplifier
Device U2 in-phase input end connection resistance R12, the resistance R12 series resistances R13, one end of the resistance R13 is through electric capacity C15
The output end of the operational amplifier U3 is connected, the other end of the resistance R13 connects the output end of the inverter controller, institute
The other end for stating resistance R13 is also connected with electric capacity C14 one end, and the other end of the electric capacity C14 is through the electric capacity C13 connections computing
Amplifier U2 in-phase input end, output of the other end of the electric capacity C14 through the resistance R14 connections operational amplifier U3
End, inverting input of the output end of the operational amplifier U3 through the resistance R17 connections operational amplifier U3, the computing
Output end of the amplifier U3 in-phase input end through the resistance R18 connections operational amplifier U2, the operational amplifier U3's
In-phase input end is grounded through resistance R19.
In force, active pair follows notch filter to include two operational amplifiers and double T trappers compositions.In Fig. 4
Resistance R14, electric capacity C15 concatenation operation amplifiers U3 output end, part output signal feeds back to electricity by operational amplifier U3
R14, electric capacity C15 are hindered, due to this positive feedback so that stopband narrows, and quality factor q improves.Though circuit is more complicated, by
High in operational amplifier U3 input impedance, operational amplifier U2 output impedance is low, strengthens maintaining double T spies while feedback
Property.The active single amplifier notch filter mentioned relative to last embodiment, active double quality factor qs for following notch filter
Can be with separately adjustable, stability is more preferable.
In addition, the formula of the active pair of centre frequency for following notch filter is
Active double centre frequency f for following notch filter are calculated by the formula0, as centre frequency f0Equal to cut-off
Frequency fmWhen, so as to adjust cut-off frequency fmIt is consistent with the resonant frequency of inversion wave filter 4 so that the two is cancelled out each other, Jin Erbao
It is stable to hold distributed power supply system.
The embodiment of the present invention proposes the notch filter for distributed power supply system, and the notch filter is active double
Notch filter is followed, active pair follows notch filter to include two operational amplifiers and double T trappers.By using improvement
Notch filter afterwards, it is suppressed that the resonance peak of inversion wave filter, it is stable to maintain distributed power supply system.
Each sequence number in above-described embodiment is for illustration only, does not represent the elder generation during the assembling or use of each part
Order afterwards.
Embodiments of the invention are the foregoing is only, are not intended to limit the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (9)
1. the notch filter for distributed power supply system, it is characterised in that the input of the notch filter is connected with
Inverter controller, the output end of the notch filter are connected with inversion wave filter, the input connection of the inverter controller
There is a combining inverter, the output end of the inversion wave filter is connected with for being turned on and off to distributed power supply system
Grid-connected switch, the output end of the grid-connected switch are connected with power network table；
Wherein, the notch filter includes resonance circuit, the inductance that the resonance circuit includes resistance R1, connected with resistance R1
L1 and the electric capacity C1 to be connected with inductance L1, the resistance R1 series connection inductance L1, the inductance L1 series connection electric capacity
C1。
2. the notch filter according to claim 1 for distributed power supply system, it is characterised in that described grid-connected to open
Close and be provided with inductance L2 between the power network table.
3. the notch filter according to claim 1 for distributed power supply system, it is characterised in that described grid-connected to open
Pass includes grid-connected contactor and breaker.
4. the notch filter according to claim 1 for distributed power supply system, it is characterised in that described grid-connected inverse
It is described to open including at least open the light a pipe and a diode, the negative pole of the colelctor electrode connection diode of the pipe that opens the light to become device
The positive pole of the emitter stage connection diode of light pipe, the input of the negative or positive electrode connection inverter controller of the diode.
5. the notch filter according to claim 1 for distributed power supply system, it is characterised in that the inversion filter
Ripple device is LCL type wave filter.
6. the notch filter for distributed power supply system according to any one of claim 1 to 5, it is characterised in that
The inverter controller includes pi controller or ratio resonant controller.
7. the notch filter according to claim 1 for distributed power supply system, it is characterised in that the trap filter
Ripple device also includes active single amplifier notch filter or active pair follows notch filter.
8. the notch filter according to claim 7 for distributed power supply system, it is characterised in that the active list
Amplifier notch filter includes operational amplifier U1, and the operational amplifier U1 has normal phase input end, inverting input, described
Operational amplifier U1 inverting input is connected through resistance R6 with the output end of itself, and the output end of the operational amplifier U1 connects
The input of the inversion wave filter is connect, the inverting input of the operational amplifier U1 is grounded through resistance R5, and the computing is put
Big device U1 in-phase input end connection resistance R2 one end, one end of the resistance R2 is also connected with electric capacity C3 one end, the electricity
The other end for hindering R2 is grounded through electric capacity C5, and the resistance R2 series resistances R3, the resistance R3 one end connect the inversion control
The output end of device processed, one end connection electric capacity C4 of resistance R3 one end, the other end of the electric capacity C4 is through resistance R4 connections
The output end of the operational amplifier U1, the electric capacity C4 series connection electric capacity C3.
9. the notch filter according to claim 7 for distributed power supply system, it is characterised in that described active double
Notch filter is followed to include operational amplifier U2 and operational amplifier U3, the operational amplifier U2 and the operation amplifier
Device U3 has normal phase input end, inverting input, and the inverting input of the operational amplifier U2 is through described in resistance R20 connections
Operational amplifier U2 output end, the output end of the operational amplifier U2 connect the output end into the inversion wave filter, institute
State operational amplifier U2 in-phase input end connection resistance R12, the resistance R12 series resistances R13, the one of the resistance R13
The output end through the electric capacity C15 connections operational amplifier U3 is held, the other end of the resistance R13 connects the inverter controller
Output end, the other end of the resistance R13 is also connected with electric capacity C14 one end, and the other end of the electric capacity C14 is through electric capacity C13
The in-phase input end of the operational amplifier U2 is connected, the other end of the electric capacity C14 is through the resistance R14 connections operation amplifier
Device U3 output end, anti-phase input of the output end of the operational amplifier U3 through the resistance R17 connections operational amplifier U3
End, output end of the in-phase input end of the operational amplifier U3 through the resistance R18 connections operational amplifier U2, the computing
Amplifier U3 in-phase input end is grounded through resistance R19.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491387A (en) * | 2020-12-08 | 2021-03-12 | 陕西航天时代导航设备有限公司 | Improve Q value and have stable notch filter circuit |
| CN113225036A (en) * | 2021-05-12 | 2021-08-06 | 上海电气集团股份有限公司 | Preamplifier and medical piezoelectric film sensor |
| CN113810021A (en) * | 2021-08-13 | 2021-12-17 | 天津大学 | Novel reconfigurable filter |
| CN114123517A (en) * | 2022-01-24 | 2022-03-01 | 国网山东省电力公司新泰市供电公司 | Power distribution automation and distribution network automation comprehensive control system and method |
| CN114142718A (en) * | 2021-11-18 | 2022-03-04 | 珠海英搏尔电气股份有限公司 | Active power factor correction circuit, switching power supply and vehicle |
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| CN113225036A (en) * | 2021-05-12 | 2021-08-06 | 上海电气集团股份有限公司 | Preamplifier and medical piezoelectric film sensor |
| CN113810021A (en) * | 2021-08-13 | 2021-12-17 | 天津大学 | Novel reconfigurable filter |
| CN113810021B (en) * | 2021-08-13 | 2024-04-05 | 天津大学 | Novel reconfigurable filter |
| CN114142718A (en) * | 2021-11-18 | 2022-03-04 | 珠海英搏尔电气股份有限公司 | Active power factor correction circuit, switching power supply and vehicle |
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