Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
45results about How to "Improve frequency response performance" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Full-wind-speed frequency response control method for doubly-fed wind generator
InactiveCN103967702AQuick releaseIncrease deceleration areaWind motor controlFinal product manufactureCurrent loadLoad Shedding
The invention discloses a full-wind-speed frequency response control method for a doubly-fed wind generator. According to the method, frequency response control can be conducted by actively identifying wind speed intervals and modifying a drooping coefficient in a self-adaptive mode. Firstly, the relation between the load shedding rate and the suboptimum tip speed ratio of the doubly-fed wind generator is established according to a doubly-fed wind power unit characteristic curve given by a manufacturer; a full wind speed is divided into a first wind speed interval, a second wind speed interval, a third wind speed interval and a fourth wind speed interval according to the wind speed from low to high; the division criterion of the four wind speed intervals is updated online according to the current load shedding rate of the doubly-fed wind generator; when the real-time frequency of a system is lowered and exceeds a set dead zone threshold, the wind speed intervals are identified according to collected real-time wind speed signals; real-time unit spare capacity is calculated, the drooping coefficient is modified in the self-adaptive mode, and then frequency response control is completed. By means of the method, the frequency response capability of the medium-wind-speed interval and the high-wind-speed interval can be improved, and the rotating speed of the generator in the weak-wind interval and the low-wind-speed interval can be not lower than the minimum allowed rotating speed.
Owner:HOHAI UNIV
Control method for frequency response of doubly-fed generator
InactiveCN104343629AImprove frequency response performanceWind motor controlMachines/enginesElectricityComputer science
The invention discloses a control method for the frequency response of a doubly-fed generator. The method comprises the following steps: 1, creating low, medium and high-wind speed interval criteria according to the initial deloading rate del% by a wine speed identification unit, and when the initial deloading rate is changed, updating data in time and performing interval identification on the wind speed; 2, setting a variable drooping coefficient Rf according to a setting calculation formula of a corresponding wind speed interval during low, medium or high wind speed; 3, monitoring a system frequency deviation delta f by a system frequency deviation monitoring unit, and when the system frequency deviation delta f exceeds a set dead region frequency range, triggering the control on the variable drooping coefficient Rf of the doubly-fed generator; 4, controlling the frequency response of the doubly-fed generator according to the currently set variable drooping coefficient Rf and the system frequency deviation delta f by a custom drooping property unit. According to the method, the capability of controlling the frequency response of the doubly-fed generator is improved by setting the variable drooping coefficient.
Owner:HOHAI UNIV
Active and passive frequency response switching control method
ActiveCN108288858AImprove frequency response performanceAvoid low frequency load sheddingFlicker reduction in ac networkPower oscillations reduction/preventionFrequency stabilizationMathematical model
The invention relates to the technical field of electric power, particularly relates to an active and passive frequency response switching control method, and specifically a frequency response controlmethod in a high-power deficiency fault. According to the method, for a two-regional power grid, a number line is adopted for representing an inter-region call wire, and an imaginary line is adoptedfor representing a communication line; A region is a disturbed region and a B region is a non-disturbed region; firstly, a unit thermal power generating unit mathematical model is established; and 2,an interconnected power grid mathematical model is established. By adoption of the method, frequency response is changed from dispersed autonomous control into concentrated coordination control, fromfeedback control into feedforward control, and from correction control to preventive control, and the overall frequency responsiveness of the system is improved under the premise of not increasing frequency response facility, thereby improving frequency stability defense capability under high disturbance; and frequency decline can be stopped effectively in a high disturbance frequency decline stage, system low frequency load shedding can be avoided, the system can be recovered to be stable in a frequency recovery stage as soon as possible, and frequency oscillation in the active control process of the system can be avoided.
Owner:STATE GRID LIAONING ECONOMIC TECHN INST +2
Fluid droplet ejection devices and methods
ActiveCN101421113ASpeed error reductionImage optimizationOther printing apparatusEngineeringActuator
A method for driving a droplet ejection device having an actuator, including applying a primary drive pulse to the actuator to cause the droplet ejection device to eject a droplet of fluid in a jetting direction, and applying one or more secondary drive pulses to the actuator which reduce a length of the droplet in the jetting direction without substantially changing a volume of the droplet.
Owner:FUJIFILM DIMATIX
High-frequency response porous PEDOT: PSS thin-film material and preparation method and application thereof
ActiveCN111825880AImprove electronic conductivityLarge specific surface areaHybrid capacitor electrodesHybrid/EDL manufactureThin membraneChemistry
The invention discloses a high-frequency response porous PEDOT: 1. PSS thin-film material. The preparation method is based on a high-molecular polymer PEDOT / PSS (poly 3, 4-ethylenedioxythiophene / polystyrene sulfonate). The preparation method comprises the following steps of: adding a polar cosolvent DMSO (dimethyl sulfoxide) into a PEDOT / PSS aqueous solution; uniformly stirring, spin-coating filter paper with the mixed solution, putting the PEDOT: PSS thin film material into a drying oven, drying at 80 DEG C for 10 minutes, treating with concentrated sulfuric acid at room temperature for 12-24hours, washing with deionized water, and finally drying to obtain the high-frequency response porous PEDOT: PSS thin-film material. The supercapacitor prepared from the high-frequency response porousPEDOT: PSS thin-film material has the advantages of high energy density, small internal resistance and good high-frequency responsiveness.
Owner:HENAN AGRICULTURAL UNIVERSITY
Wind power frequency modulation control method suitable for high wind power penetration level
PendingCN113394827AFast frequency responseGood effectSingle network parallel feeding arrangementsWind energy generationWind power penetrationTime domain
The invention provides a wind power frequency modulation control method suitable for a high wind power penetration level, and relates to the field of wind power generation grid connection, and the method comprises the following steps: monitoring the frequency of a power grid in real time, calculating the instantaneous frequency of the power grid, and when the frequency deviation of the power grid exceeds a set dead zone range due to the disturbance of a power system, measuring the rotating speed of a fan, and when the rotating speed omega r of a fan rotor is larger than the allowable minimum rotating speed omega min, starting a virtual inertia control module of the doubly-fed wind turbine generator, wherein the fan actively participates in frequency modulation; calculating the active increment of the wind turbine generator; calculating the equivalent active power increment of the time domain; calculating an active reference value of the fan; and after the time delta t, gently switching the active power output of the fan to the maximum power tracking output power, so the rotating speed gradually recovers to the initial state. A virtual inertia control link is additionally added to a wind turbine generator rotor side converter controller, when the power grid frequency exceeds the limit due to disturbance, the virtual inertia control link participates in frequency modulation of a power system by use of the rapid throughput of kinetic power of the fan rotor, the frequency modulation response is faster, and the effect is better.
Owner:NANTONG UNIVERSITY
Cobweb-shaped flexible strain sensor capable of identifying strain direction and preparation method thereof
ActiveCN111649665AImprove conductivitySmall hysteresisFibre typesElectrical/magnetic solid deformation measurementPolymer scienceAdhesive
The invention discloses a cobweb-shaped flexible strain sensor capable of identifying a strain direction and a preparation method. The method comprises the following steps of mixing a conductive filler, a hot-melt adhesive and an N, N-dimethylformamide solvent, and carrying out ultrasonic dispersion to obtain a dispersion liquid, putting the granular thermoplastic polymer into a screw extruder, and extruding a pure thermoplastic polymer wire, drawing the wire material to pass through the dispersion liquid at a constant speed by utilizing a wire winding roller traction device, forming a uniformand thin conductive layer on the surface of the wire material, and printing the wire material into a cobweb-shaped array by utilizing a 3D printer after the wire material is completely dried, and fixing the wire at the center of the cobweb and the tail end of the longitudinal wire by using conductive silver adhesive to prepare the cobweb-shaped flexible strain sensor. The cobweb-shaped customizedstructure is rapidly prepared, and the sensor also has the function of identifying the strain direction, has the advantages of high linearity, high sensitivity, wide strain range, rapid response, lowhysteresis, good stability and the like, and has great potential in the application of wearable equipment.
Owner:SOUTHWEST PETROLEUM UNIV
Compensation controller and MEMS accelerometer closed-loop servo special integrated circuit
PendingCN109324210AImprove noise characteristicsImprove steady state errorAcceleration measurement using interia forcesControllers with particular characteristicsCapacitanceAccelerometer
The invention discloses a compensation controller. The compensation controller comprises an operational amplifier, a first resistor, a second resistor, a first capacitor, a second capacitor, a first switch, a second switch and a third switch; the compensation input end is connected with the reverse input end of the operational amplifier after being connected with the first resistor; the positive input end of the operational amplifier is grounded, and the output end is connected with the feedback output end; the first capacitor is connected with the compensation input end and the reverse inputend of the operational amplifier; the first switch and the first capacitor are connected in series; the second resistor, the third switch the second capacitor are connected in series, and then the integral end is connected with the output end of the operational amplifier, and the other end is connected with the reverse input end thereof; and the third switch and the second capacitor are connectedin series and then are connected with the second switch in parallel. The compensation controller is used for an accelerometer closed-loop control system, and the compensation modes can be changed according to different sensitive structures of the accelerometers, so that the system performance is improved, and the system stability is enhanced.
Owner:JIANGSU JICUI MICRO NANO AUTOMATION SYST & EQUIP TECH RES INST CO LTD
Active and passive frequency response compound control method
ActiveCN108110776AImprove frequency response performanceImprove frequency stability and resistanceFlicker reduction in ac networkPower oscillations reduction/preventionFrequency stabilizationMathematical model
The invention relates to the field of electric power technology, in particular to an active and passive frequency response compound control method, in particular to a frequency response control methodunder large disturbances. The method of the invention includes the steps of first, establishing a mathematical model of a unit thermal power unit, and second, establishing a mathematical model of aninterconnected power grid. The method of the invention realizes the change of frequency response from decentralized control to centralized control, from feedback control to feedforward control, and from correction control to preventive control, and can improve the overall frequency response capability of the system without increasing frequency response facilities, thereby improving the frequency stability and resistance under large disturbances. The method can also coordinate the global and local control objectives, and can not only avoid the low-frequency load shedding of the system under large disturbances, but also make the system restore stability quickly, thereby avoiding the frequency oscillation in the active control process.
Owner:STATE GRID LIAONING ECONOMIC TECHN INST +2
Shielding of datalines with physical placement based on time staggered access
ActiveUS20090300255A1Improve frequency response performanceIncreased control circuit complexityData switching by path configurationDigital storageData connectionAudio power amplifier
A bus driver circuit divides an internal data bus for an integrated circuit memory into at least two groups, designated by speed. A faster group of data lines and a slower group of data lines are placed in an interleaved fashion in order to provide a two group shielding solution. At the earliest opportunity following the reception of a read command, the data from memory banks in the memory is sorted into these two groups. For a DDR3 memory, the sorting method is based on the A2 column address, known as C2. All of the data is brought out of the banks in parallel and sorted as it enters the main amplifiers. These main amplifiers are also divided into two groups, faster and slower. Each amplifier then connects to a data line (G-line) of the same group. The clock assigned to the fast group fires right away, thereby connecting the data associated with the fast amplifiers to the fast data group. This data group then proceeds to the output buffers through the entire data path as fast as possible. The second, slower data group is started with a delayed clock signal and proceeds through the data path to the output buffer maintaining a fixed delay. Since the first and second data groups are not switching at the same time they act as shields to one another.
Owner:PROMOS TECH INC
Structure capable of improving output displacement and inherent frequency of piezoelectric flexible mechanism
InactiveCN106159079ARaise the natural frequencyThe natural frequency does not decreasePiezoelectric/electrostrictive devicesFlexible MechanismsElectricity
The invention discloses a structure capable of improving output displacement and inherent frequency of a piezoelectric flexible mechanism. The structure comprises a rhombus-shaped flexible mechanism, a piezoelectric stack, piezoelectric sheets, a displacement sensor, a data acquisition system, a power amplifier and a controller, wherein the displacement sensor is arranged at a rigid output end and the plurality of piezoelectric sheets are fixedly arranged at the two ends of a flexible beam respectively; a signal output end of the displacement sensor is connected with a signal input end of the data acquisition system; the signal output end of the data acquisition system is connected with the signal input end of a controller; and signal output of the controller is amplified through the power amplifier and then is connected with a driving signal input end of the piezoelectric stack / piezoelectric sheets. An additional bending moment is generated through sticking the piezoelectric sheets so that the output displacement of the rhombus-shaped flexible mechanism is enlarged and the inherent frequency of the flexible mechanism is not reduced; and furthermore, the inherent frequency of the flexible mechanism is improved through designing relatively thick flexible beam and flexible hinge, and a lost displacement amplification ratio is compensated by the bending moment provided by the additional piezoelectric sheets.
Owner:GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
Frequency control method based on wind power consumption
ActiveCN108879721AGood frequency controlGive full play to the frequency adjustment abilitySingle network parallel feeding arrangementsPower oscillations reduction/preventionAutomatic Generation ControlElectricity
The invention discloses a frequency control method based on wind power consumption, comprising the steps as follows: A, calculating a wind power deviation of each sub-area in the control area; B, calculating a total wind power deviation of all sub-areas in the control area; C, distributing the total wind power deviation to each sub-area of the control area to adjust the regional control deviation,and calculating the adjusted regional control deviation after dynamic adjustment of each sub-area; and D, issuing a control command to the generator set in the sub-areas by the automatic power generation control system corresponding to the sub-areas according to the adjusted regional control deviation to realize the frequency modulation control. The invention is capable of sharing the frequency modulation responsibility equally among the sub-areas of the control area to further improve the current state of the frequency regulation of the power grid, so as to achieve the maximum complementaryfrequency modulation capability between the sub-areas, thereby ensuring safe and stable operation of the grid while improving the wind power consumption capacity of the grid.
Owner:STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
Carbon nano onion film-based super capacitor used in alternating current line filtering field
ActiveCN113394027AIncrease volume capacityIncrease volumetric energy densityHybrid capacitor electrodesHybrid/EDL manufactureSupercapacitorChemical vapor deposition
The invention discloses a carbon nano onion film-based supercapacitor used in the field of alternating current line filtering. An electrode material of a carbon nano onion film with an interconnection structure is synthesized on the surface of a nickel sheet by adopting a chemical vapor deposition method; and a water-based electrolyte or an organic electrolyte is respectively utilized to assemble the carbon nano onion film-based supercapacitor for alternating-current line filtering. According to the carbon nano onion film-based supercapacitor, the advantage of high curvature of the carbon nano onion can be utilized, and the excellent frequency response performance and the high rate performance of the carbon nano onion can be fully exerted. And the super capacitor has high volume specific capacity, volume energy density and good working stability.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
Overall lattice reflection weighted surface acoustic wave resonator
ActiveCN106788321AImprove frequency response performanceReduce side peak interferenceImpedence networksElectricityGrating
The invention provides an overall lattice reflection weighted surface acoustic wave resonator comprising a piezoelectric substrate, wherein a metal interdigital transducer and a reflecting grating are sputtered on the piezoelectric substrate, the reflecting grating comprises a first short circuit grating and a second short circuit grating arranged on left and right sides of the metal interdigital transducer, the first short circuit grating and the second short circuit grating are symmetrically distributed on the left and right sides of the metal interdigital transducer, and metal lattices are respectively arranged between a false point of the metal interdigital transducer and an adjacent electrode, between adjacent grid bars of the first short circuit grating and between adjacent grid bars of the second short circuit grating. The overall lattice reflection weighted surface acoustic wave resonator provided by the invention has the beneficial effects that the metal weighing lattices are arranged on the false point of the metal interdigital transducer, the first short circuit grating and the second short circuit grating to reduce the side peak interference caused by the metal interdigital transducer and the reflection of the reflecting grating and improve the frequency response performance of the SAW resonator.
Owner:苏州光声纳米科技有限公司
Silicon microphone
PendingCN110620978AIncrease volumeEasy to pushElectrostatic transducer microphonesSignal-to-noise ratio (imaging)Air volume
The invention provides a silicon microphone, which comprises a shell, and is characterized in that the shell is provided with a sound inlet hole; the base plate and the shell form a accommodating cavity, the sound inlet hole is communicated with the accommodating cavity, one surface of the base plate is provided with a concave cavity, and the concave cavity is provided with an opening; acoustic assembly, the piston is positioned in the accommodating cavity; the acoustic assembly is arranged in the cavity and arranged on the surface of the substrate, the acoustic assembly comprises an MEMS sensor, the MEMS sensor covers the opening, the cavity serves as an extended rear chamber of the MEMS sensor, and the area between the sound inlet hole and the MEMS sensor serves as a front chamber of theMEMS sensor. The silicon microphone has the advantages that the concave cavity is formed in the substrate, the volume of the rear chamber of the MEMS sensor is enlarged, that is, the air volume of the rear chamber is increased, and sound waves entering from the sound inlet hole more easily push the vibrating diaphragm of the MEMS sensor to move, so that the sensitivity and the signal-to-noise ratio of the silicon microphone are improved, Meanwhile, the frequency response performance of the silicon microphone can also be improved.
Owner:MEMSENSING MICROSYST SUZHOU CHINA
Giant dielectric thin film transistor
InactiveCN110148632AImprove frequency response performanceNo hysteresisTransistorDisplay deviceHysteresis phenomenon
The invention relates to a giant dielectric thin film transistor, which is provided with a grid electrode, a semiconductor and a gate insulating layer located between the grid electrode and the semiconductor layer, wherein the gate insulating layer adopts a giant dielectric material; the relative dielectric constant is greater than 10000 at the frequency of 1kHz when the giant dielectric materialis in a ceramic block state, and the relative dielectric constant is greater than 500 at the frequency of 1kHz when the giant dielectric material is in a thin film state; and the giant dielectric material is a non-ferroelectric ceramic material. Compared with a TFT adopting ionic double electric layer to serve as the gate insulating layer, the giant dielectric thin film transistor of the inventionhas the advantage of good frequency response, the frequency response of an inverter is greater than 500Hz, and the circuit is low in consumption, thereby having good application potential in the field of displays. Meanwhile, the giant dielectric thin film transistor of the invention is prepared by adopting the non-ferroelectric material, so that there is no hysteresis phenomenon.
Owner:SOUTH CHINA UNIV OF TECH
Surface Acoustic Wave Resonator with Lattice Structure
ActiveCN103296994BEliminate the influence of frequency characteristicsEffective reflectionImpedence networksPhotonicsSurface acoustic wave resonators
The invention discloses a surface-acoustic-wave resonator with a lattice structure. The surface-acoustic-wave resonator comprises a piezoelectric substrate. A metal interdigital transducer and metal grating arrays are arranged on the piezoelectric substrate by means of sputtering, and the metal grating arrays are arranged on two sides of the metal interdigital transducer. The metal grating arrays include open gratings which are arranged on the left side and the right side of the metal interdigital transducer and respectively called the first open grating and the second open grating, and the first open grating and the second open grating are symmetrically distributed on the left side and the right side of the metal interdigital transducer. The metal grating array consisting of the first open grating and the second open grating is arranged along the y direction parallelly, arranged along the x direction vertically and distributed in the x direction periodically. Photonic crystals are arranged on the metal interdigital transducer and are distributed in the x direction periodically and distributed in the y direction randomly. The surface-acoustic-wave resonator with the lattice structure has the advantages that affection of a high-order transverse-wave mode to frequency characteristics of the resonator is eliminated and frequency response performance of the surface-acoustic-wave resonator is improved.
Owner:苏州光声纳米科技有限公司
An Active Frequency Response Event Control Strategy
ActiveCN107910879BImprove frequency response performanceImprove frequency stability and resistanceFlicker reduction in ac networkPower oscillations reduction/preventionFrequency stabilizationElectric power system
The invention discloses an active frequency response event control strategy. The active frequency response event control strategy comprises: in an offline state, clustering all possible operation states of a power system according to selected frequency stability related state quantity to form several typical scenes, analyzing the typical scenes to determine an active frequency response control strategy of each scene to form a control decision table, determining the active frequency response event control strategy: dividing frequency fluctuation and evolution process of a power grid into two stages, namely, a frequency decline phase and a frequency recovery stage; and performing frequency control on the power grid by adopting an active frequency response event control mode in the frequencydecline phase and adopting a passive frequency response parameter feedback control mode in the frequency recovery stage. The control strategy provided by the invention can effectively intercept frequency decline in the frequency decline phase so as to avoid low-frequency load reduction of the system, and makes the system restore the stability in the frequency recovery stage as soon as possible toavoid frequency oscillation of the system in an active control process.
Owner:DALIAN UNIV OF TECH
A Surface Acoustic Wave Resonator with Precisely Weighted Metal Lattice of Reflective Grid
ActiveCN106788315BWeighted precisionImprove frequency response performanceImpedence networksGratingSide lobe
Owner:广东斐瑞智能技术有限公司
Microphone packaging structure and method for preparing microphone packaging structure
ActiveCN113132877BHigh sensitivityImprove signal-to-noise ratioMicrophonesLoudspeakersNoiseEngineering
Embodiments of the present invention provide a microphone packaging structure and a method for preparing the microphone packaging structure, which relate to the technical field of microphone packaging. The microphone packaging structure includes a functional substrate, a silicon wheat chip, a first cover, a second cover and a carrier substrate , the carrying substrate is provided with accommodating grooves, by opening the accommodating grooves, the first cover can be accommodated in the accommodating grooves, thereby reducing the overall packaging volume, reducing the size of packaged products, and the functional substrate Mounted on the carrier substrate, the problem of warpage of the substrate will not occur between the functional chip and the first cover during cutting. And the front cavity of the silicon microphone chip is formed through the first cover to guide the transmission of sound pressure, and the second cover forms the back cavity of the silicon microphone chip, which improves the air space on the back of the silicon microphone chip, thereby improving the sensitivity and signal-to-noise of the silicon microphone ratio, while also improving the frequency response of silicon microphones.
Owner:FOREHOPE ELECTRONICS NINGBO CO LTD
Carbon nano-onion film-based supercapacitors for AC line filtering
ActiveCN113394027BIncrease volume capacityIncrease volumetric energy densityHybrid capacitor electrodesHybrid/EDL manufactureSupercapacitorChemical vapor deposition
The invention discloses a carbon nano-onion film-based supercapacitor used in the field of AC line filtering. The electrode material of a carbon nano-onion film with an interconnected structure is synthesized on the surface of a nickel sheet by using a chemical vapor deposition method, and the electrode material of the carbon nano-onion film is synthesized by using an aqueous or organic A carbon nano-onion film-based supercapacitor assembled with two electrolytes for AC line filtering. The carbon nano-onion film-based supercapacitor can take advantage of the high curvature of the carbon nano-onion and give full play to its excellent frequency response performance and high rate performance. Moreover, it has high volume specific capacity, volume energy density and good working stability.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY
A Structure for Improving the Output Displacement and Natural Frequency of a Piezoelectric Flexible Mechanism
InactiveCN106159079BRaise the natural frequencyThe natural frequency does not decreasePiezoelectric/electrostrictive devicesCompliant mechanismData acquisition
Owner:GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
Active and passive frequency response switching control method
ActiveCN108288858BImprove frequency response performanceAvoid low frequency load sheddingFlicker reduction in ac networkPower oscillations reduction/preventionFrequency stabilizationMathematical model
Owner:STATE GRID LIAONING ECONOMIC TECHN INST +2
Active and Passive Frequency Response Composite Control Method
ActiveCN108110776BImprove frequency response performanceImprove frequency stability and resistanceFlicker reduction in ac networkPower oscillations reduction/preventionFrequency stabilizationControl objective
The invention relates to the field of electric power technology, in particular to an active and passive frequency response composite control method, in particular to a frequency response control method under large disturbances. The invention includes the following steps: firstly, establishing a mathematical model of a unit thermal power unit; secondly, establishing a mathematical model of an interconnected power grid. The invention realizes the transformation of frequency response from decentralized control to centralized control, from feedback control to feedforward control, and from correction control to preventive control, and can improve the overall frequency response capability of the system without increasing frequency response facilities, thereby improving Frequency stability and resistance to large disturbances. It can also coordinate global and local control objectives, which can not only avoid low-frequency load shedding of the system under large disturbances, but also quickly restore stability to the system and avoid frequency oscillations in the active control process of the system.
Owner:STATE GRID LIAONING ECONOMIC TECHN INST +2
Exhaust valve plate applied to compressor
InactiveCN109209834AImprove frequency response performanceReduce vibrationPositive displacement pump componentsPositive-displacement liquid enginesExhaust valveFrequency response
The invention relates to an exhaust valve plate for a compressor. A main body of the exhaust valve plate is of a three-layer composite structure. The three-layer composite structure comprises a firstmetal valve plate layer, a damping layer and a second metal valve plate layer. The damping layer is arranged between the first metal valve plate layer and the second metal valve plate layer in a clamped mode. Compared with metal exhaust valve plates in the prior art, the exhaust valve plate for the compressor adopts the composite structure that the damping layer is clamped between the two metal valve plate layers; an inventor finds that when the metal valve plate layers and the damping layer are combined by adopting a specific thickness and physical parameters, the composite structure can combine the advantages of both metal valve plates and a damping material, the stiffness and flatness required for the exhaust valve plate are reserved, the sealing performance in the compression process is ensured, the frequency response performance of the whole exhaust valve plate can also be improved, a frequency response curve is smoother, and especially vibration and noise when the exhaust valve plate is rebound to a valve seat can be reduced.
Owner:SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
High frequency droplet ejection device and method
ActiveCN100575105CImprove frequency response performanceReduce speed errorOther printing apparatusEngineeringActuator
In general, in one aspect, the invention features a method for driving a droplet ejection device having an actuator, including applying a multipulse waveform that includes two or more drive pulses to the actuator to cause the droplet ejection device to eject a single droplet of a fluid, wherein a frequency of the drive pulses is greater than a natural frequency, fj, of the droplet ejection device.
Owner:FUJIFILM DIMATIX
A kind of AGC optimal control method of power system with dfig
ActiveCN108092323BImprove stabilityImprove FM pressureSingle network parallel feeding arrangementsDesign optimisation/simulationElectric power systemControl engineering
Owner:YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
A full wind speed frequency response control method for doubly-fed wind turbines
InactiveCN103967702BQuick releaseIncrease deceleration areaWind motor controlFinal product manufactureLoad SheddingCurrent load
The invention discloses a full-wind-speed frequency response control method for a doubly-fed wind generator. According to the method, frequency response control can be conducted by actively identifying wind speed intervals and modifying a drooping coefficient in a self-adaptive mode. Firstly, the relation between the load shedding rate and the suboptimum tip speed ratio of the doubly-fed wind generator is established according to a doubly-fed wind power unit characteristic curve given by a manufacturer; a full wind speed is divided into a first wind speed interval, a second wind speed interval, a third wind speed interval and a fourth wind speed interval according to the wind speed from low to high; the division criterion of the four wind speed intervals is updated online according to the current load shedding rate of the doubly-fed wind generator; when the real-time frequency of a system is lowered and exceeds a set dead zone threshold, the wind speed intervals are identified according to collected real-time wind speed signals; real-time unit spare capacity is calculated, the drooping coefficient is modified in the self-adaptive mode, and then frequency response control is completed. By means of the method, the frequency response capability of the medium-wind-speed interval and the high-wind-speed interval can be improved, and the rotating speed of the generator in the weak-wind interval and the low-wind-speed interval can be not lower than the minimum allowed rotating speed.
Owner:HOHAI UNIV
An eddy current displacement sensor and its implementation method
ActiveCN105783692BExpand the output rangeHigh sensitivityUsing electrical meansElectrical resistance and conductanceResonance
The invention discloses a wide-range high-precision high dynamic response eddy current displacement sensor and an implementation method. The sensor comprises an AC resonance boosting bridge, a fixed amplitude circuit, an amplitude compensating and adding circuit, an orthogonal sampling trigger signal generation circuit and a high speed sampling processor. The method comprises following steps: performing dual-path data sampling through a dual-path sampling method and calculating loss resistance of the resonance circuit according to the dual-path sampling data (S1, S2); calculating coil displacement according to the circuit loss; calculating displacement temperature drift after temperature compensation according to temperature S3. According to the invention, the sensitivity and measurement range of the sensor are increased by coil boosting, fixed amplitude excitation, and amplitude compensating; external disturbance is reduced and dynamic response and stability are increased by orthogonal sampling and digital processing.
Owner:INST OF INTELLIGENT MFG GUANGDONG ACAD OF SCI
Method for optimizing frequency feedback coefficient of speed adjuster of power generator
ActiveCN108664749AImprove frequency response performanceLow costDesign optimisation/simulationSpecial data processing applicationsComputer scienceDynamo
The invention discloses a method for optimizing the frequency feedback coefficient of a speed adjuster of a power generator. The method comprises the steps of 1, building a power grid node dynamics model containing the speed adjuster; 2, initializing parameters of a multi-objective particle swarm optimization algorithm; 3, calculating a performance objective function and a sparsity objective function of each particle in a particle swarm; 4, updating a common elite set and a feasible solution elite set; 5, updating a position vector Xpbest of personal guide particles, a position vector Xgbest of global guide particles, wherein the position vector Xpbest and the position vector Xgbest are shown in the descriptions; 6, updating the position and speed of each particle; 7, seeking a particle corresponding to a minimum sparsity objective function J2(Xm(kmax)) in the feasible solution elite set, setting the position vector of the particle as Xm(kmax) to obtain a feedback coefficient matrix Km, namely a final optimization result. By means of the method, the power grid frequency response performance can be improved while the cost price is lowered.
Owner:XIAN UNIV OF TECH
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com