CN114221560A - PWM rectifier LLCL filter design structure and method - Google Patents
PWM rectifier LLCL filter design structure and method Download PDFInfo
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- CN114221560A CN114221560A CN202111295104.6A CN202111295104A CN114221560A CN 114221560 A CN114221560 A CN 114221560A CN 202111295104 A CN202111295104 A CN 202111295104A CN 114221560 A CN114221560 A CN 114221560A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H2007/013—Notch or bandstop filters
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention provides a design structure of a PWM rectifier LLCL filter, wherein the LLCL filter is arranged at the input end of the PWM rectifier and is used for filtering harmonic current generated by the action of a switching tube; the electric reactor mainly comprises a network side reactor L1, a bridge side reactor L2, a trap branch resonant reactor L3, a trap branch filter capacitor Cf and a trap branch damping resistor Rd. The bridge side reactor L2 has an attenuation effect on bridge arm side current; the trap branch resonant reactor L3 and the trap branch filter capacitor Cf are connected in series to form a trap for filtering harmonic current near the switching frequency; the damping resistor Rd of the trap branch circuit is connected with the filter capacitor Cf of the trap branch circuit in series to inhibit the resonance of the system; the grid side reactor L1 may further attenuate the grid side current harmonics. The invention also provides a design method of the LLCL filter of the PWM rectifier.
Description
Technical Field
The invention relates to the field of PWM rectifier input filter design methods, in particular to a PWM rectifier LLCL filter design structure and a PWM rectifier LLCL filter design method.
Background
In many fields such as modern industry and life, in order to satisfy the working requirements of electric equipment and obtain good economic benefits, a large number of power conversion devices are emerging, and a rectifier can convert alternating current into direct current to supply the electric equipment.
Although the traditional diode rectification or thyristor rectification is simple to control and stable in operation, the power factor is low, the current in a line can be increased, and unnecessary loss is caused.
The PWM rectifier utilizes IGBT or MOSFET and the like as a switching tube, can greatly improve the power factor of the rectifier, can obviously reduce the volume, can also flow in two directions, can feed the energy back to a power grid in some occasions, and is widely applied at present.
The traditional PWM rectifier input filter has poor filtering effect and large loss, and is not suitable for a high-power PWM rectifier.
Therefore, it is necessary to design a new PWM rectifier LLCL filter to overcome the above problems.
Disclosure of Invention
The present invention is directed to overcoming the disadvantages of the prior art and providing a design structure and method for a LLCL filter of a PWM rectifier, which at least solves some of the problems of the prior art.
The invention is realized by the following steps:
the invention provides a design structure of a PWM rectifier LLCL filter, which comprises a LLCL filter arranged at the input end of a three-phase PWM rectifier and used for filtering harmonic current generated by the action of a switching tube in the three-phase PWM rectifier, wherein the LLCL filter comprises three branches corresponding to three-phase voltage, a grid-side reactor L1 and a bridge-side reactor L2 are arranged on each branch, the grid-side reactor L1 and the bridge-side reactor L2 are connected in series, the other end of the grid-side reactor L1 is directly connected with a power grid, the other end of the bridge-side reactor L2 is connected with the three-phase PWM rectifier, the LLCL filter further comprises three notch branch resonance reactors L3, three notch branch filter capacitors Cf and three notch branch damping resistors Rd, the three notch branch resonance reactors L3 are in one-to-one correspondence with the three branches, and the midpoint of the series connection of the grid-side reactor L1 and the bridge-side reactor L2 is led out, the other end of each notch branch resonant reactor L3 is electrically connected with one end point of the triangle, the other end of each notch branch resonant reactor L3 corresponds to the three end points of the triangle one by one, and one notch branch filter capacitor Cf and one notch branch damping resistor Rd are arranged between any two end points of the triangle.
The invention also provides a design method of the LLCL filter of the PWM rectifier, which comprises the following steps: the method comprises the following steps that S1, in order to meet four-quadrant operation of a rectifier, the upper limit value of a grid side reactor L1+ a bridge side reactor L2 needs to meet the limitation requirement;
s2, in order to meet the loss of a trap branch and the stability of system control, ripples of output current of a bridge arm of a switching tube need to be limited, namely a bridge-side reactor L2 needs to meet the requirement of minimum inductance;
s3, the grid-side reactor L1 needs to follow proper harmonic attenuation indexes;
s4, in order to meet reactive loss of a system, the upper limit value of the filter capacitor Cf of the notch branch needs to meet the limit requirement;
s5, a trap branch resonant reactor L3 and a trap branch filter capacitor Cf are connected in series to form a trap for filtering harmonic current near the switching frequency;
s6, a damping resistor Rd of the trap branch circuit is connected with a filter capacitor Cf of the trap branch circuit in series, and in order to meet the suppression effect on resonance, the impedance of the trap branch circuit needs to meet the limitation requirement.
Preferably, in step S1, the upper limit value L1+ L2 of the bridge-side reactor L1 and the grid-side reactor L2 is confirmed based on the effective value E of the rated input line voltage, the dc-side voltage U, the effective value I of the phase current, the fundamental frequency f, and the carrier frequency fsw of the three-phase PWM rectifier,
preferably, in step S2, the value of the bridge-side reactor L2 is confirmed from the attenuation coefficient α of the bridge-arm-side current ripple,
preferably, in step S3, the value of the grid-side reactor L1 is checked from the attenuation coefficient β of the grid-side current with respect to the arm-side ripple, and L1 is equal to β L2.
Preferably, in step S4, according to the reactive power ratio requirement of the system, γ is the ratio of the reactive power of the notch branch filter capacitor Cf to the active power P, v is the voltage across the notch branch filter capacitor Cf, where the notch branch filter capacitor Cf is connected in a delta, v is equal to the effective line voltage E, the value of the notch branch filter capacitor Cf is determined,
preferably, in step S5, the value of notch branch resonant reactor L3 is determined based on notch branch filter capacitance Cf and carrier frequency fsw,
and checking whether the resonant frequency fres of the whole LLCL filter meets the condition that fres is more than or equal to 10f and less than or equal to 0.5fsw, and if not, re-selecting the correlation coefficient for calculation until the requirement is met.
Preferably, in step S6, the value of the notch branch damping resistor Rd is determined according to the resonant frequency fres of the whole system and the value of the notch branch filter capacitor Cf,
value of Rd
Z of (A)Cf。
The invention has the following beneficial effects:
compared with the traditional LLCL filter, the LLCL filter has the advantages that the filter capacitor Cf adopts a triangular connection mode, a better filtering effect can be achieved under the same capacitance value, meanwhile, the damping resistor Rd is connected with the filter capacitor Cf in series, the current flowing in the damping resistor Rd is smaller under the same condition, namely, the loss is lower, the efficiency is improved, and meanwhile, the heat dissipation design of a high-power rectifier is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1(a) is a bode diagram of a conventional LCL filter circuit, and fig. 1(aa) is a partially enlarged view of fig. 1 (a); FIG. 1(b) is a bode diagram of an LLCL filter circuit used in the present invention, and FIG. 1(bb) is a partial enlarged view of FIG. 1 (b);
FIG. 2(a) is a PWM rectifier topology based on LLCL filtering used in the present invention, and FIG. 2(b) is a simplified PWM rectifier topology based on conventional LLCL filtering;
fig. 3(a) is a result of a fourier analysis of a net side current of the conventional LLCL filter, and fig. 3(b) is an effective value of a current flowing through a damping resistor of the conventional LLCL filter;
fig. 4(a) is a fourier analysis result of the current on the network side using the same filter inductance, filter capacitance, and damping resistance parameters under the present invention, and fig. 4(b) is an effective value of the current flowing through the damping resistance using the same filter inductance, filter capacitance, and damping resistance parameters under the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-4, a LLCL filter design structure of a PWM rectifier according to an embodiment of the present invention includes a LLCL filter disposed at an input end of a three-phase PWM rectifier for filtering harmonic current generated by operation of switching tubes in the three-phase PWM rectifier, where the LLCL filter includes three branches corresponding to three-phase voltages, a grid-side reactor L1 and a bridge-side reactor L2 are disposed on each branch, the grid-side reactor L1 and the bridge-side reactor L2 are connected in series, the other end of the grid-side reactor L1 is directly connected to a power grid, the other end of the bridge-side reactor L2 is connected to a middle point of a bridge arm of the three-phase PWM rectifier, that is, between two switching tubes of the conventional three-phase PWM rectifier connected in series, the bridge-side reactor L2 attenuates bridge-arm-side current, the grid-side reactor L1 may further attenuate grid-side harmonic current, and the LLCL filter further includes three trap resonance reactors L3, L2, The three trap branch filter capacitors Cf are connected in series with the three trap branch damping resistors Rd, the middle point of the series connection of the network side reactor L1 and the bridge side reactor L2 is led out and is connected with one end of the trap branch resonance reactor L3, the three trap branch filter capacitors Cf are connected with the three trap branch damping resistors Rd in series, the ends of the three trap branch filter capacitors Cf are connected in a triangular mode, the other end of each trap branch resonance reactor L3 is electrically connected with one end point of the triangle, the other end of each trap branch resonance reactor L3 is in one-to-one correspondence with the three end points of the triangle, and one trap branch filter capacitor Cf and one trap branch damping resistor Rd are arranged between any two end points of the triangle.
The damping resistor Rd is connected with the filter capacitor Cf in series to inhibit the system from resonance. The trap branch resonant reactor L3 and the trap branch filter capacitor Cf are connected in series to form a trap, and the trap is mainly used for filtering harmonic current near the switching frequency. Compared with the traditional LLCL filter, the LLCL filter has the advantages that the filter capacitor Cf adopts a triangular connection mode, a better filtering effect can be achieved under the same capacitance value, meanwhile, the damping resistor Rd is connected with the filter capacitor Cf in series, the current flowing in the damping resistor Rd is smaller under the same condition, namely, the loss is lower, the efficiency is improved, and meanwhile, the heat dissipation design of a high-power rectifier is facilitated.
The embodiment of the invention provides a design method of a LLCL filter of a PWM rectifier, which comprises the following steps: the method comprises the following steps that S1, in order to meet four-quadrant operation of a rectifier, the upper limit value of a grid side reactor L1+ a bridge side reactor L2 needs to meet the limitation requirement;
s2, in order to meet the loss of a trap branch and the stability of system control, ripples of output current of a bridge arm of a switching tube need to be limited, namely a bridge-side reactor L2 needs to meet the requirement of minimum inductance;
s3, the grid-side reactor L1 needs to follow proper harmonic attenuation indexes;
s4, in order to meet reactive loss of a system, the upper limit value of the filter capacitor Cf of the notch branch needs to meet the limit requirement;
s5, a trap branch resonant reactor L3 and a trap branch filter capacitor Cf are connected in series to form a trap for filtering harmonic current near the switching frequency;
s6, a damping resistor Rd of the trap branch circuit is connected with a filter capacitor Cf of the trap branch circuit in series, and in order to meet the suppression effect on resonance, the impedance of the trap branch circuit needs to meet the limitation requirement.
The specific design method comprises the following steps:
according to the rated input line voltage effective value E, the direct current side voltage U, the phase current effective value I, the fundamental frequency f and the carrier frequency fsw of the PWM rectifier, the upper limit value L1+ L2 of the bridge side inductance and the grid side inductance is confirmed,
confirming the value of the bridge side inductance L2 according to the attenuation coefficient alpha of the bridge arm side current ripple,
confirming the value of a network side inductor L1 according to the attenuation coefficient beta of the network side current to the bridge arm side ripple, wherein L1 is beta L2;
according to the systemFor the requirement of the proportion of the reactive power, gamma is the proportion of the reactive power on the capacitor Cf to the active power P, v is the voltage at two ends of the capacitor Cf, wherein the capacitor Cf is connected in a triangular mode, v is equal to the effective value E of the line voltage, the value of the filter capacitor Cf of the notch branch is confirmed,
according to the filter capacitance Cf of the notch branch circuit and the carrier frequency fsw, the value of a resonance inductor L3, namely a resonance reactor, is determined,
checking the resonant frequency fres of the whole LLCL filter, judging whether fres is more than or equal to 10f and less than or equal to 0.5fsw is met, f is the fundamental frequency, fsw is the carrier frequency, and if not, selecting the correlation coefficient again for calculation until the requirement is met;
determining the value of a damping resistor Rd and the capacitive reactance of a filter capacitor Cf of a trap branch according to the resonant frequency fres of the whole system and the value of the filter capacitor Cf of the trap branch
Value of Rd
Z of (A)Cf；
The invention continues to use the calculation method of the traditional LCL filter, but the filter capacitor adopts a triangular connection mode, the damping resistor is connected with the filter capacitor in series, and the filter capacitor can play a better filtering effect and has lower loss on the resistor on the premise of not changing the capacitance value and the resistance value of the capacitor.
In this embodiment, a 132KW PWM rectifier is taken as an example, and a design method of a PWM rectifier LLCL filter is described, in which an effective value U of a line voltage on a grid side is 380V, a switching frequency fsw of a rectifier is 4khz, and the switching frequency fsw of the rectifier is a carrier frequency fsw.
The design method of the present invention is further explained below with reference to the drawings.
Referring to fig. 2(a) below, the PWM rectifier LLCL filter of the present invention is constructed as follows:
a grid-side inductor L1 and a bridge-side inductor L2 are connected in series, the grid-side inductor is a grid-side reactor, the bridge-side inductor is a bridge-side reactor, the other end of the grid-side inductor L1 is directly connected with a power grid, and the other end of the bridge-side inductor L2 is connected to the middle point of a bridge arm; the midpoint of the series connection of the network side inductor L1 and the bridge side inductor L2 is led out and connected with one end of a trap branch resonant reactor L3; the damping resistor Rd is connected with the filter capacitor Cf in series, the ends of the damping resistor Rd and the filter capacitor Cf form triangular connection, and each end point of the triangle is connected to the middle point of the series connection of the network side inductor L1 and the bridge side inductor L2. Note that in choosing the filter capacitor Cf, it is necessary to take into account that the voltage across the capacitor Cf is close to the three-phase line voltage.
The following are the electrical parameters of the component obtained according to the design method of the invention:
| element number | Electrical parameter |
| L1 | 400UH |
| L2 | 100UH |
| L3 | 13UH |
| CF | 40UF |
| Rd | 0.4Ω |
Fig. 3(a) shows the net side current fourier analysis result of the conventional LLCL filter under the above parameters, where the net side current total harmonic distortion THD value is 2.52%, and (b) shows the effective value of the current flowing through the damping resistor after the conventional LLCL filter is stabilized, where the value is close to 12A; in FIG. 3(b), the abscissa is time(s) and the ordinate is A;
fig. 4(a) shows the net side current fourier analysis result of the present invention under the same parameters, the net side current total harmonic distortion THD value is 2.20%, and (b) shows the effective value of the current flowing through the damping resistor, which is close to 7A after being stabilized; in FIG. 4(b), the abscissa is time(s) and the ordinate is A;
comparing the two groups of simulation results, the invention finds that under the condition of only changing the voltage-withstand grade of the capacitor and not changing other electrical parameters of elements, the Total Harmonic Distortion (THD) value of the current on the grid side is obviously lower than that of the traditional scheme, the loss on the damping resistor is also much lower, and the characteristic is more obvious in a high-power and low-frequency PWM rectifier.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A kind of PWM rectifier LLCL electric-wave filter design structure, characterized by that: the LLCL filter comprises three branches corresponding to three-phase voltage, a grid side reactor L1 and a bridge side reactor L2 are arranged on each branch, the grid side reactor L1 and the bridge side reactor L2 are connected in series, the other end of the grid side reactor L1 is directly connected with a power grid, the other end of the bridge side reactor L2 is connected to the three-phase PWM rectifier, the LLCL filter further comprises three notch branch resonant reactors L3, three notch branch filter capacitors Cf and three notch branch damping resistors Rd, the three notch branch resonant reactors L3 are in one-to-one correspondence with the three branches, a midpoint of the series connection of the grid side reactor L1 and the bridge side reactor L2 is led out and connected with one end of the notch branch resonant reactor L3, the three notch branch filter capacitors Cf and the three notch branch damping resistors Rd are connected in series, a triangle is formed by the head and the tail of the three notch branch filter capacitors Cf and the three notch branch damping resistors Rd, the other end of each notch branch resonance reactor L3 is electrically connected with one end point of the triangle, the other end of each notch branch resonance reactor L3 corresponds to the three end points of the triangle one by one, and one notch branch filter capacitor Cf and one notch branch damping resistor Rd are arranged between any two end points of the triangle.
2. A design method of a LLCL filter of a PWM rectifier is characterized in that: the method comprises the following steps that S1, in order to meet four-quadrant operation of a rectifier, the upper limit value of a grid side reactor L1+ a bridge side reactor L2 needs to meet the limitation requirement;
s2, in order to meet the loss of a trap branch and the stability of system control, ripples of output current of a bridge arm of a switching tube need to be limited, namely a bridge-side reactor L2 needs to meet the requirement of minimum inductance;
s3, the grid-side reactor L1 needs to follow proper harmonic attenuation indexes;
s4, in order to meet reactive loss of a system, the upper limit value of the filter capacitor Cf of the notch branch needs to meet the limit requirement;
s5, a trap branch resonant reactor L3 and a trap branch filter capacitor Cf are connected in series to form a trap for filtering harmonic current near the switching frequency;
s6, a damping resistor Rd of the trap branch circuit is connected with a filter capacitor Cf of the trap branch circuit in series, and in order to meet the suppression effect on resonance, the impedance of the trap branch circuit needs to meet the limitation requirement.
3. The PWM rectifier LLCL filter design method of claim 2, characterized in that:
in step S1, the upper limit value L1+ L2 of the bridge side reactor L1 and the grid side reactor L2 is confirmed based on the effective value E of the rated input line voltage of the three-phase PWM rectifier, the voltage U of the DC side, the effective value I of the phase current, the fundamental wave frequency f, and the carrier frequency fsw,
4. the PWM rectifier LLCL filter design method of claim 3, characterized in that:
in step S2, the value of the bridge-side reactor L2 is confirmed from the attenuation coefficient alpha of the bridge-arm-side current ripple,
5. the PWM rectifier LLCL filter design method of claim 4, characterized in that:
in step S3, the value of the grid-side reactor L1 is checked from the attenuation coefficient β of the grid-side current with respect to the arm-side ripple, and L1 is equal to β L2.
6. The PWM rectifier LLCL filter design method of claim 5, characterized in that:
in step S4, according to the reactive power ratio requirement of the system, γ is the ratio of the reactive power of the notch branch filter capacitor Cf to the active power P, v is the voltage across the notch branch filter capacitor Cf, where the notch branch filter capacitor Cf is connected in a delta shape, v is equal to the effective line voltage E, the value of the notch branch filter capacitor Cf is determined,
7. the PWM rectifier LLCL filter design method of claim 6, characterized in that:
in step S5, the value of a notch branch resonant reactor L3 is determined based on the notch branch filter capacitance Cf and the carrier frequency fsw,
and checking whether the resonant frequency fres of the whole LLCL filter meets the condition that fres is more than or equal to 10f and less than or equal to 0.5fsw, and if not, re-selecting the correlation coefficient for calculation until the requirement is met.
8. The PWM rectifier LLCL filter design method of claim 7, characterized in that:
in step S6, the value of the damping resistor Rd of the notch branch is determined according to the resonant frequency fres of the whole system and the value of the filter capacitor Cf of the notch branch,
value of Rd
Z of (A)Cf。
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|---|---|---|---|---|
| CN102468651A (en) * | 2010-11-12 | 2012-05-23 | 吴卫民 | Filter for specific frequency current bypass |
| CN103746587A (en) * | 2014-01-22 | 2014-04-23 | 开封光利高科实业有限责任公司 | Control damping method applied to the resonance inhibition of LLCL single-phase grid connected inverter |
| CN205657582U (en) * | 2016-04-26 | 2016-10-19 | 江苏易立电气股份有限公司 | LLCL type bank electricity variable frequency power supply shipboard filter circuit |
| CN207926186U (en) * | 2017-12-19 | 2018-09-28 | 齐齐哈尔工程学院 | A kind of active filter |
| CN210839320U (en) * | 2019-10-28 | 2020-06-23 | 安徽建筑大学 | LCLC type passive damping circuit, single-phase and three-phase grid-connected inverter system |
| KR20220132825A (en) * | 2021-03-24 | 2022-10-04 | 한국전력공사 | HARMONIC CURRENT REDUCTION FILTER and DISTRIBUTION LINKAGE SYSTEM COMPRISING IT |
-
2021
- 2021-11-03 CN CN202111295104.6A patent/CN114221560B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468651A (en) * | 2010-11-12 | 2012-05-23 | 吴卫民 | Filter for specific frequency current bypass |
| CN103746587A (en) * | 2014-01-22 | 2014-04-23 | 开封光利高科实业有限责任公司 | Control damping method applied to the resonance inhibition of LLCL single-phase grid connected inverter |
| CN205657582U (en) * | 2016-04-26 | 2016-10-19 | 江苏易立电气股份有限公司 | LLCL type bank electricity variable frequency power supply shipboard filter circuit |
| CN207926186U (en) * | 2017-12-19 | 2018-09-28 | 齐齐哈尔工程学院 | A kind of active filter |
| CN210839320U (en) * | 2019-10-28 | 2020-06-23 | 安徽建筑大学 | LCLC type passive damping circuit, single-phase and three-phase grid-connected inverter system |
| KR20220132825A (en) * | 2021-03-24 | 2022-10-04 | 한국전력공사 | HARMONIC CURRENT REDUCTION FILTER and DISTRIBUTION LINKAGE SYSTEM COMPRISING IT |
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| CN114221560B (en) | 2023-08-29 |
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