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54 results about "Self resonance" patented technology
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Antenna array for an RFID reader compatible with transponders operating at different carrier frequencies
An antenna array is provided for an RFID reader, which includes a first reader antenna tuned to operate at a first frequency and a second reader antenna tuned to operate at a second frequency different from the first frequency. The first and second antennas are preferably arranged in an overlapping arrangement or an opposing magnetic flux arrangement to reduce the effect of antenna self resonance.
Owner:ASSA ABLOY AB
Method and apparatus for fully integrating a voltage controlled oscillator on an integrated circuit
InactiveUS6268778B1Wide tuning capacitance rangeReduce parasitic capacitanceAngle modulation by variable impedencePulse automatic controlLc resonatorSelf resonance
A method and apparatus for fully integrating a Voltage Controlled Oscillator (VCO) on an integrated circuit. The VCO is implemented using a differential-mode circuit design. The differential-mode implementation of the VCO preferably comprises a differential mode LC-resonator circuit, a digital capacitor, a differential pair amplifier, and a current source. The LC-resonator circuit includes at least one tuning varactor and two high Q inductors. The tuning varactor preferably has a wide tuning capacitance range. The tuning varactor is only used to "fine-tune" the center output frequency f0 of the VCO. The center output frequency f0 is coarsely tuned by the digital capacitor. The VCO high Q inductors comprise high gain, high self-resonance, and low loss IC inductors. The IC VCO is fabricated on a high resistivity substrate material using a trench isolated guard ring. The guard ring isolates the fully integrated VCO, and each of its component parts, from RF signals that may be introduced into the IC substrate by other devices. By virtue of the improved performance characteristics provided by the digital capacitor, the analog tuning varactor, the high Q inductor, and the trench isolated guard ring techniques, the inventive VCO is fully integrated despite process variations in IC fabrication.
Owner:CSR TECH INC
Antenna array for an RFID reader compatible with transponders operating at different carrier frequencies
ActiveUS20050258966A1Simultaneous aerial operationsSensing record carriersSelf resonanceMagnetic flux
An antenna array is provided for an RFID reader, which includes a first reader antenna tuned to operate at a first frequency and a second reader antenna tuned to operate at a second frequency different from the first frequency. The first and second antennas are preferably arranged in an overlapping arrangement or an opposing magnetic flux arrangement to reduce the effect of antenna self resonance.
Owner:ASSA ABLOY AB
Induction magnetometer
InactiveUS7375529B2Convenient ArrangementHigh aspect ratioElectrodynamic magnetometersAcoustic wave reradiationSelf resonanceUltimate tensile strength
An array of induction magnetometers for use in airborne transient electromagnetic (ATEM) geophysical exploration is disclosed, having similar weight and external dimensions of prior art induction magnetometers but with improved signal strength, signal-to-noise ratio, higher frequency, self-resonance and bandwidth, and providing accurate and well monitored calibration.
Owner:UNIVERSITY OF NEW BRUNSWICK
Antenna array for an RFID reader compatible with transponders operating at different carrier frequencies
ActiveCN1722521AAbility to extend functionalityMemory record carrier reading problemsIndependent non-interacting antenna combinationsSelf resonanceMagnetic flux
Owner:ASSA ABLOY AB
Non contact-power receiving/transmitting device and manufacturing method therefor
InactiveUS20130038135A1Low efficiencyIncrease in sizeRail devicesBatteries circuit arrangementsElectric power systemSelf resonance
A manufacturing method for a non-contact power receiving / transmitting device that transmits or receives electric power in a non-contact manner and that includes a coil unit and an electromagnetic shield, wherein the coil unit includes a self-resonance coil that is configured to receive or transmit electric power via an electromagnetic field generated through electromagnetic resonance and an adjusting unit that adjusts a resonance frequency of the self-resonance coil, the manufacturing method including: installing the coil unit; arranging the electromagnetic shield around the self-resonance coil except a direction in which electric power is received or transmitted; and adjusting the adjusting unit in accordance with a distance between the coil unit and a surface of the electromagnetic shield vertical to a direction of the electromagnetic field inside the self-resonance coil so that the resonance frequency becomes a predetermined frequency.
Owner:TOYOTA JIDOSHA KK
Induction magnetometer
InactiveUS20050156601A1Convenient ArrangementIncreased apparent permeabilityMagnetic field measurement using flux-gate principleElectrodynamic magnetometersSelf resonanceUltimate tensile strength
An array of induction magnetometers for use in airborne transient electromagnetic (ATEM) geophysical exploration is disclosed, having similar weight and external dimensions of prior art induction magnetometers but with improved signal strength, signal-to-noise ratio, higher frequency, self-resonance and bandwidth, and providing accurate and well monitored calibration.
Owner:UNIVERSITY OF NEW BRUNSWICK
Feedthrough capacitor having reduced self resonance insertion loss dip
InactiveUS7623336B2Capacitor Quality Factor (Q) is relatively minimizedSelf-resonance insertion loss dip of the capacitor is reduced or eliminatedAnti-noise capacitorsElectrotherapySelf resonanceHigh resistivity
The self-resonance insertion loss dip of a feedthrough capacitor is reduced or eliminated by raising the equivalent series resistance of the capacitor, thus minimizing the capacitor Q. The equivalent series resistance of the capacitor can be raised by forming voids in the active and / or ground electrode plates of the capacitor. The electrode plates may be formed so as to have a relatively reduced thickness, or a relatively increased thickness. A conductive material having a relatively high resistivity may be used to form the active and / or ground electrode plates of the capacitor. Alternatively, the conductive material forming the electrode plates may have a dielectric material added thereto.
Owner:WILSON GREATBATCH LTD
High Voltage Power Supply
InactiveUS20090316445A1Effective supervisionAc-dc conversionDc-dc conversionLow voltageSelf resonance
This invention pertains to the control of high voltage power, and in particular to control of high voltage power from low voltage sources while reducing unwanted self resonance in the windings of a self oscillating flyback converter.
Owner:BATTELLE MEMORIAL INST
Dual-use nmr probe
InactiveUS20110025326A1High sensitivityWide tuning rangeMeasurements using NMR imaging systemsElectric/magnetic detectionSelf resonanceMicro coil
An NMR probe comprising an RF resonator 48 serves in a first mode for conventional sensitivity optimized studies of abundant samples at frequency ω0, and in a second mode for independent sensitivity optimized studies of micro sample quantities at frequency ω0 through use of a removably insertable self-resonant micro-coil 50 within the RF resonator 48 and closely surrounding a micro sample, that is preferably independently removably insertable within the micro-coil. The NMR probe exhibits an enhanced tuning range to resonate in its first mode and in the second mode to inductively couple to the self-resonant micro-coil 50 to induce self-resonance of the micro-coil 50 at ω0.
Owner:AGILENT TECH INC
Self-resonance structure based on open hole resonance loop
InactiveCN101262211AHalf Power Relative Bandwidth ReductionHigh Frequency-Phase ResponseImpedence networksResonatorsCapacitancePhase response
The invention relates to a self-resonant structure based on a split resonance ring. The self-resonant structure comprises split ring structure 1 and adjunct circuit structure 2, wherein, the adjunct circuit structure 2 is positioned in an opening of the split ring structure 1 which can be formed by being surrounded by suspended metal strips and can also be a split rectangular ring or a circular ring formed by micro-strip structure printed on a media basic plate; the adjunct circuit structure 2, in whole, can be equivalent to the parallel connection of an inductor and a capacitor and can be realized by welded and lumped inductance and capacitance, also by a metal strip or distributed micro-strip structure printed on a media plate and still by a semi-lumped and semi-distributed circuit. The self-resonant structure based on a split resonance ring provided by the invention has narrow-band bandstop function, high-sensitivity frequency-phase responding and excellent stop-band or reflective characteristics and has the advantages of simple design structure, convenient processing and manufacture and excellent re-design and co-design capability and can be applied to the designs of filters (or a reflector required with high-sensitivity phase induction) in a planar circuit and spatial structure at the same time.
Owner:SOUTHEAST UNIV
Feedthrough capacitor having reduced self resonance insertion loss dip
InactiveUS20070279834A1Capacitor Quality Factor (Q) is relatively minimizedSelf-resonance insertion loss dip of the capacitor is reduced or eliminatedAnti-noise capacitorsElectrotherapySelf resonanceHigh resistivity
The self-resonance insertion loss dip of a feedthrough capacitor is reduced or eliminated by raising the equivalent series resistance of the capacitor, thus minimizing the capacitor Q. The equivalent series resistance of the capacitor can be raised by forming voids in the active and / or ground electrode plates of the capacitor. The electrode plates may be formed so as to have a relatively reduced thickness, or a relatively increased thickness. A conductive material having a relatively high resistivity may be used to form the active and / or ground electrode plates of the capacitor. Alternatively, the conductive material forming the electrode plates may have a dielectric material added thereto.
Owner:WILSON GREATBATCH LTD
Non contact-power receiving/transmitting device and manufacturing method therefor
InactiveUS9130408B2Low efficiencyIncrease in sizeRail devicesBatteries circuit arrangementsElectric power systemSelf resonance
A manufacturing method for a non-contact power receiving / transmitting device that transmits or receives electric power in a non-contact manner and that includes a coil unit and an electromagnetic shield, wherein the coil unit includes a self-resonance coil that is configured to receive or transmit electric power via an electromagnetic field generated through electromagnetic resonance and an adjusting unit that adjusts a resonance frequency of the self-resonance coil, the manufacturing method including: installing the coil unit; arranging the electromagnetic shield around the self-resonance coil except a direction in which electric power is received or transmitted; and adjusting the adjusting unit in accordance with a distance between the coil unit and a surface of the electromagnetic shield vertical to a direction of the electromagnetic field inside the self-resonance coil so that the resonance frequency becomes a predetermined frequency.
Owner:TOYOTA JIDOSHA KK
Die edge integrity monitoring system
ActiveUS20180145002A1Reliable and goodIncrease resistanceSemiconductor/solid-state device testing/measurementElectronic circuit testingElectrical resistance and conductanceHigh resistance
An edge crack monitoring system for an integrated circuit provided on a die, comprises a conductive trace comprising at least a first conductive path for allowing current in a first direction, and a second adjacent conductive path for allowing current in a second direction opposite to the first direction. Both adjacent conductive paths form at least one loop surrounding a semiconductor device on a die. The arrangement of the trace is adapted to provide compensation of EM interferences. The trace comprises two terminals being connectable to a detection circuit for detecting damages by generating a fault signal upon detection of disruption of the conductive trace due to a damage. The conductive trace comprises high resistance portions with a resistance of at least 1 kΩ, adapted for reducing self-resonance.
Owner:MELEXIS TECH NV
Online diesel exhaust fluid solution concentration monitoring system and monitoring method for automobile SCR system
InactiveCN104792828AAvoid contactIncreased sensitivityMaterial impedanceProcess moduleData acquisition
Owner:JILIN UNIV
Loading of a twisted folded-monopole
InactiveUS20120100817A1Simultaneous aerial operationsElectrically long antennasSelf resonanceMonopole antenna
A loading of a twisted folded monopole (LTFM) includes a first antenna portion and a second antenna portion. The first and second antenna portions are mutually coupled to support a lower band for wireless communications. The LTFM also includes a third antenna portion and a fourth antenna portion. The third and fourth antenna portions generate self resonance in a higher band for wireless communications.
Owner:MOTOROLA SOLUTIONS INC
Noncontact testing method for inherent frequency and quality factor of resonance coil
InactiveCN104614595AReduce mistakesHigh measurement accuracyElectric devicesResistance/reactance/impedenceCapacitanceElectricity
The invention provides a noncontact testing method for inherent frequency and quality factor of a resonance coil, relates to a measurement technology of the inherent frequency and quality factor of a self-resonance coil adopting own distributed capacitance in a magnetic coupling resonant antenna electricity energy transmission system, and aims at solving the problem that introduced error and large impendence lead to accurate measurement result during measuring the inherent frequency and the quality factor of the resonance coil by the direct measuring method. The method comprises the steps of activating a coil to be measured through a primary magnetic field generated by a small standard coil to obtain impedance parameters; calculating the impedance characteristics of the standard coil and comparing with the impedance characteristics under the condition that the coil to be measured is not added so as to obtain the impedance information of the coil to be measured; measuring and calculating the inherent frequency f0 and the quality factor of the self-resonance coil. The method has the characteristics of being small in error, high in measurement precision, and convenient to measure; the accuracy is increased by at least 20% by being compared with that of the direct measuring method.
Owner:HARBIN INST OF TECH
Magnetic coupling resonance wireless power transmitting equipment and method
ActiveCN104659929ARealize transmissionImprove transmission efficiencyElectromagnetic wave systemCircuit arrangementsCouplingSelf resonance
The invention provides magnetic coupling resonance wireless power transmitting equipment and a magnetic coupling resonance wireless power transmitting method. The equipment comprises an LC resonance network with a transmitting coil, a power supply and a self-resonance control circuit, wherein the power supply is connected with the LC resonance network at a transmitting end, and charges the LC resonance network at the transmitting end; the self-resonance control circuit monitors the charging process; after the charging is finished, the self-resonance control circuit controls to cut off the power of the power supply; the LC resonance network performs self-resonance oscillating at a natural frequency and transmits the energy out in the form of an electromagnetic wave through a resonance coil in the LC resonance network at the transmitting end; when the self-resonance control circuit detects that the energy of the LC resonance network at the transmitting end is lower than a preset threshold value during a self-resonance oscillating process, the self-resonance control circuit closes the power supply; the power supply starts to charge the LC resonance network at the transmitting end. Through the equipment and the method, self-resonance intermittent wireless power transmitting can be realized without the help of external excitation.
Owner:WUHAN TAIKE ELECTRIC
State detection device applied to mobile terminal and mobile terminal
ActiveCN106713626AImprove protectionImprove antenna switching effectTransmitters monitoringReceivers monitoringState variationSecondary radiation
The invention discloses a state detection device applied to a mobile terminal and a mobile terminal, a technical effect of performing detection on the service state of the mobile terminal is realized, and the mobile terminal is enabled to improve a waterproof protection effect and an antenna switching effect based on a service state detection result when designing functions such as waterproof protection and antenna switching. The state detection device is characterized in that a primary antenna radiator is excited by a primary antenna signal source to realize self resonance and radiation in a set frequency band, and a metal secondary antenna radiator is enabled to be excited by the primary antenna radiator to generate secondary radiation in the set frequency band; a secondary antenna radiation signal coupler acquires an antenna signal radiated by the metal secondary antenna radiator, a signal receiver receives the antenna signal and judges whether the radiation frequency thereof is the radiation frequency of the set frequency band or not; and an antenna state detection module generates a state detection result of the mobile terminal according to a judgment result of the signal receiver. Operations such as waterproof protection and antenna switching can be executed according to state variations after the state of the mobile terminal is acquired.
Owner:QINGDAO HISENSE MOBILE COMM TECH CO LTD
Photovoltaic system ground-fault resistance detection and location method
InactiveCN108649893AReduce troubleshooting timeReduce labor costsPhotovoltaic monitoringPhotovoltaic energy generationCapacitanceCapacitive coupling
The invention provides a photovoltaic system ground-fault resistance detection and location method, comprising the following steps: connecting an alternating-current impedance measuring device with aphotovoltaic system through a capacitive coupling, and measuring photovoltaic system positive and negative wiring resonance point impedance values ZP and ZN and a photovoltaic system self-resonance point impedance value Zall through different connection methods; assuming that the photovoltaic module resonance point impedance values are the same, calculating to obtain a photovoltaic component resonance point impedance value Zavr; according to the positive and negative resonance point impedance values and the photovoltaic system resonance point impedance value and the photovoltaic module resonance point impedance values, calculating a ground-fault resistance value Rfault and a ground-fault location l. The photovoltaic system ground-fault resistance detection and location method does not needto additionally arranging sensors, does not depend on the fault current value, realizes the ground-fault resistance prediction and fault location according to the impedance characteristics of the photovoltaic system, and has certain significances for shortening the fault checking time and lowering the labor cost.
Owner:上海岩芯电子科技有限公司
All-metal-ring narrow-frame 4G smart phone antenna
PendingCN107104284ATroubleshoot poor performanceImprove radiation efficiencyAntenna supports/mountingsAntennas earthing switches associationCapacitanceLow frequency band
The invention discloses an all-metal-ring narrow-frame 4G smart phone antenna. The smart phone antenna comprises a PCB and a system floor; a metal ring is wound around the periphery of the PCB; a gap is formed between the metal ring and the PCB; a feed port used for dividing the metal ring into two annular antennas is formed in the metal ring; the base modes and higher order modes of the two annular antennas jointly cover six frequency bands; the smart phone antenna also comprises a grounding metal sheet and a matching circuit which is formed by a capacitive element and an inductive element connected in parallel; the matching circuit is arranged between the grounding metal sheet and the system floor; the metal ring and the matching circuit jointly form a radiation unit of the antenna; and the self resonance of the capacitive element and the inductive element influences the input impedance value of the dual annular antennas in a low frequency, so that the resonant points at the low frequency band are increased. By adoption of the structure, when the antenna is applied to all-metal-ring surrounding, the metal structure is not damaged while seven-frequency-band 4G coverage can be realized; and meanwhile, the smart phone antenna is more in frequency bands, high in radiation efficiency, narrow in frame, and maintains completeness of the metal ring without damage, so that the smart phone antenna is quite suitable for the modern mobile phone.
Owner:JIANGSU MINGLIAN ELECTRONICS TECH
LED (Light-Emitting Diode) lamp based on discrete wireless power supply
InactiveCN103216796ARealize wireless transmissionQuick changeElectromagnetic wave systemPoint-like light sourceShortest distanceEngineering
The invention provides an LED (Light-Emitting Diode) lamp based on discrete wireless power supply, which comprises a transmitting coil, a drive circuit, a receiving coil, a receiving circuit and an LED lamp, wherein the transmitting coil generates inductive power through self-resonance; the drive circuit is connected between an external power source and the transmitting coil and drives the self-resonance of the transmitting coil to generate the inductive power according to the power received from the external power source; the receiving coil is opposite to the transmitting coil and is coupled with the transmitting coil through the self-resonance to induct and receive the power in the transmitting coil; the receiving circuit is connected with the receiving coil and receives the power in the receiving coil; and the LED lamp is connected with the receiving circuit and is lightened when the receiving circuit receives the power. The receiving coil is not electrically contacted with the transmitting coil, the short-distance wireless transmission of power is realized through the coupling of the receiving coil and the transmitting coil, and the power received by the receiving coil is supplied to the LED lamp.
Owner:XIANGYANG YISHENG PHOTOELECTRIC TECH CO LTD
High-frequency-isolation gate driver circuit and gate circuit driving method
ActiveUS20170331471A1Prevents noise current occurrenceReduce failureElectronic switchingPulse duration/width modulationDriver circuitTransformer
In a configuration of an isolation circuit using a transformer of a high-frequency-isolation gate driver circuit in the frequency band from 1 to 100 MHz, a period for resetting the exciting current is eliminated, generation of self-resonance phenomenon after resetting is cancelled to reduce generation of noise current, and malfunctions of the switching element due to noise is prevented. In driving plural gate circuits by RF signals, exciting current is allowed to pass through a primary coil of a gate driver transformer alternately in both directions continuously all the time, in a configuration for isolating drive input signals by the gate driver transformer. Accordingly, the reset period that is required when the exciting current flows only in one way becomes unnecessary, and thus generation of self-resonance phenomenon after resetting is canceled. Then, generation of noise current caused by the self-resonance phenomenon is reduced.
Owner:KYOSAN ELECTRIC MFG CO LTD
Dual-use NMR probe
Owner:AGILENT TECH INC
Buried self-resonant bypass capacitors within multilayered low temperature co-fired ceramic (LTCC) substrate
A multilayered, low temperature co-fired ceramic (LTCC) substrate within which one or more capacitors are formed (e.g., for power supply decoupling). Self-resonance is introduced by the capacitance of each capacitor interacting with an inductance formed by the interconnects (e.g., conductive vias and other conductive interconnects among the electrode patterns), which couple such capacitor to its respective circuit electrode and interface electrode (e.g., ground reference).
Owner:NAT SEMICON CORP
Exhaust purification device of electric self-purification diesel vehicle
InactiveCN105332767AExtend the life cyclePracticalExhaust apparatusSilencing apparatusMotor driveElectromechanics
The invention relates to the field of electromechanics and specifically relates to an exhaust purification device of an electric self-purification diesel vehicle. The exhaust purification device comprises a front end cover, a sleeve, secondary air supply devices, Venturi tube devices, a vibrating motor, a drive rod, a metal honeycomb carrier catalyst, a thermal insulating layer, flange holes, a deflector, a gas inlet and a rear end cover; the flange holes are formed in two upper and lower end faces of the front end cover; the sleeve is fixed between the front end cover and the rear end cover; the secondary air supply devices, the Venturi tube devices and the metal honeycomb carrier catalyst are all arranged within the sleeve; one end of the deflector is connected with the Venturi tube devices, while the other end of the deflector is connected with the metal honeycomb carrier catalyst through the drive rod; the drive rod is connected with the vibrating motor; the air inlet is formed in the sleeve; the thermal insulating layer is arranged between the honeycomb carrier catalyst and an inner surface of the sleeve; when the vibrating motor drives the drive rod to move, the drive rod drives the deflector to achieve self-resonance, so that adsorbed soot particles can be shaken off.
Owner:张志通
Wireless energy supply method and device for diagnosis system
InactiveCN102201703AReduce harmSmall spaceElectromagnetic wave systemCircuit arrangementsHigh energyEngineering
The invention provides a magnetic resonance type wireless energy supply method and device for a capsule diagnosis system. The invention is typically characterized in that: the aim of efficiently supplying energy to the capsule diagnosis system is fulfilled by using a magnetic field resonance technique. The complete set of device consists of an in-vitro part and an in-vivo part, wherein the in-vitro part mainly comprises a communication circuit, a control circuit, a driving circuit, an exciting coil, a self-resonance transmitting coil and the like; and the in-vivo part mainly comprises a three-dimensional self-resonance receiving coil, a three-dimensional energy output coil, a rectifying and filtering circuit, a load, a sampling circuit, an analog-to-digital conversion circuit, a communication circuit and the like. The device has the advantages of high energy converting efficiency, safety for human bodies and convenience of using.
Owner:SHANGHAI RES INST OF MICROELECTRONICS SHRIME PEKING UNIV
Carbon nano-tube ionization self-resonance type gas sensitive sensor
InactiveCN103267793ARich varietyQuick responseMaterial electrochemical variablesNoise generationGas detector
The invention relates to a carbon nano-tube ionization self-resonance type gas sensitive sensor, which comprises a carbon nano-tube electrode, an aluminum plate electrode and an insulating film, wherein the insulating film covers the carbon nano-tube electrode, and is provided with a row of concave grooves corresponding to polar contributions of difference gases, the aluminum plate electrode covers the insulating film, and a bias voltage generation device is connected between the carbon nano-tube electrode and the aluminum plate electrode. The gas sensitive sensor further comprises a noise generation device for producing noises with multiple stochastic resonance strengths and a gas recognition module for real-timely recording voltage-current detection data after inducing multiple stochastic resonances and carrying out pattern recognition classification on the detection data to achieve gas type detection. The carbon nano-tube ionization self-resonance type gas sensitive sensor has characteristics of rapid response, more gas detection varieties and high repeatability, is not easily affected by a temperature, an air pressure and other environmental factors, and is suitable for field use.
Owner:ZHEJIANG GONGSHANG UNIVERSITY
Low-electric-field emission end coil for wireless charging
InactiveCN106849376AReduce distractionsReduce negative impactBatteries circuit arrangementsTransformersEngineeringAlternating current
The invention discloses a low-electric-field emission end coil for wireless charging. The low-electric-field emission end coil for wireless charging introduces tuning capacitors between single coil bodies of a common emission end coil, wherein the tuning capacitors are used for reducing adverse effects of parasitic capacitance of the tuning capacitors and reducing radiation interference of EMI and RF interference (RFI); the capacitance of the tuning capacitors makes the single coil bodies generate self resonance, avoids accumulation of alternating-current voltage between turn numbers of adjacent coils and makes a simultaneous minimum electric field of the near-field magnetic field effect generated. The low-electric-field coil is provided for resonant wireless charging product series, and has the advantages of being smaller in electric field interference, and capable of passing the FCC EMI certification more easily and providing a stable coil for large-area 1:N charging application.
Owner:苏州横空电子科技有限公司
Self-adaptive quasi-PR active damping low-frequency harmonic suppression method
PendingCN114865633ALow costReduce power consumptionAc-dc conversionSingle network parallel feeding arrangementsLoop controlParallel resonance
The invention discloses a self-adaptive quasi-PR active damping low-frequency harmonic suppression method, and the method comprises the steps: introducing a self-adaptive quasi-PR control link on the basis of conventional double-closed-loop control, introducing a phase compensation structure on the basis of quasi-PR control, and adding a voltage proportion feedforward link at a PCC grid-connected point, thereby obtaining the self-adaptive quasi-PR active damping low-frequency harmonic suppression method. According to the method, zero-static-error tracking of grid-connected current to sine given current is achieved, the content of third, fifth and seventh harmonics in the grid-connected current is reduced, active damping of the system is increased, the capacity of the system for resisting power grid voltage disturbance is improved, meanwhile, main low-frequency resonance existing in an inverter in the grid-connected cluster system is equivalently converted and offset, and therefore the grid-connected cluster system is optimized. Self resonance and parallel resonance of the LCL photovoltaic grid-connected inverter are effectively inhibited; multi-point low-frequency resonance suppression of the multi-inverter grid-connected system is achieved, passive damping control can be replaced, the hardware cost and power consumption are effectively reduced, and the stability of the grid-connected system is remarkably improved.
Owner:HUNAN UNIV OF TECH
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