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1656 results about "Current amplitude" patented technology
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Pulsed current averaging controller with amplitude modulation and time division multiplexing for arrays of independent pluralities of light emitting diodes
ActiveUS20070024213A1Improve efficiencyFiner and more responsive and more resilient controlElectrical apparatusElectroluminescent light sourcesCurrent amplitudeReference level
Exemplary embodiments provide a system, method and appartus for regulating current in loads, such as in an array of independent pluralities of light emitting diodes (“LEDs”). An exemplary system comprises a multiplexer adapted to switch current to each independent string of LEDs; a first controller to maintain a substantially constant average current level to the plurality of LEDs; and a second controller to modulate a current amplitude and duration of time division multiplexing for each independent string of LEDs. Another aspect of the system provides for modulating the on time for switching current to maintain a substantially constant average current level and to respond and converge quickly to changing current reference levels.
Owner:CHEMTRON RES
Methods of determining the presence of double stranded nucleic acids in a sample
InactiveUS6428959B1Bioreactor/fermenter combinationsBiological substance pretreatmentsRNA blottingAssay
Methods for determining the presence of double stranded nucleic acids in a sample are provided. In the subject methods, nucleic acids present in a fluid sample are translocated through a nanopore, e.g. by application of an electric field to the fluid sample. The current amplitude through the nanopore is monitored during the translocation process and changes in the amplitude are related to the passage of single- or double-stranded molecules through the nanopore. The subject methods find use in a variety of applications in which the detection of the presence of double-stranded nucleic acids in a sample is desired, e.g. in hybridization assays, such as Northern blot assays, Southern blot assays, array based hybridization assays, etc.
Owner:RGT UNIV OF CALIFORNIA
Methods and apparatuses for tracking maximum power point of solar electricity generating system
InactiveUS20050110454A1Batteries circuit arrangementsDc-dc conversionSolar electricityCurrent amplitude
A solar electricity generating system includes a solar cell and a DC / AC converter coupled to the cell. The first proposed method includes the steps of: (a) adjusting an output current of the DC / AC converter; (b) sensing an output voltage variation of the solar cell; (c) adjusting the output current in a direction of the variation; and (d) repeating the steps (a) to (c). The second proposed method includes the steps of: (a) adjusting a DC output voltage of the solar cell; (b) sensing an output current amplitude variation of the DC / AC converter; (c) adjusting the output voltage in a direction of the variation; and (d) repeating the steps (a) to (c).
Owner:DELTA ELECTRONICS INC
Demagnetizing a head in a disk drive by increasing the frequency of an AC write signal while maintaining the write current amplitude
ActiveUS7092186B1Reduce the amplitudeDemagnetisation of recording headsRecord information storageHemt circuitsControl circuit
A disk drive is disclosed which demagnetizes the head after a write operation. Write circuitry applies a write signal to the head in order to write data to a selected data sector during a write operation, wherein the write signal comprises a predetermined write current amplitude. Control circuitry demagnetizes the head at the end of the write operation by maintaining the write current amplitude while increasing a frequency of an AC write signal applied to the head over a predetermined demagnetization interval, wherein increasing the frequency of the AC write signal decreases an amplitude of the AC write signal when observed at the head.
Owner:WESTERN DIGITAL TECH INC
Pulsed current averaging controller with amplitude modulation and time division multiplexing for arrays of independent pluralities of light emitting diodes
ActiveUS7888881B2Improve efficiencySmall sizeElectrical apparatusElectroluminescent light sourcesSwitched currentAverage current
Exemplary embodiments provide a system, method and apparatus for regulating current in loads, such as in an array of independent pluralities of light emitting diodes (“LEDs”). An exemplary system comprises a multiplexer adapted to switch current to each independent string of LEDs; a first controller to maintain a substantially constant average current level to the plurality of LEDs; and a second controller to modulate a current amplitude and duration of time division multiplexing for each independent string of LEDs. Another aspect of the system provides for modulating the on time for switching current to maintain a substantially constant average current level and to respond and converge quickly to changing current reference levels.
Owner:CHEMTRON RES
Apparatus for stimulating a muscle of a subject
InactiveUS7257448B2Significant to useIncrease calorie expenditureElectrotherapyArtificial respirationElectrical impulsePhysical therapy
A method and apparatus for stimulating a muscle of a subject are provided. The apparatus comprises a signal generator for generating an electrical pulse signal of a frequency and a current amplitude for inducing contractions in the muscle, and an electrode apparatus for applying the signal to nerves associated with the muscle to be stimulated or adjacent the muscle of the subject for stimulating the muscle. The frequency and current amplitude of the electrical pulse signal are selected so as to maximize the bulk of the muscle being subjected to the contractions so as to generate a shivering phenomenon therein.
Owner:BIO MEDICAL RES
Parameter offline identification method for permanent magnet synchronous motor under condition of rest
InactiveCN103178769AImprove consistencyEliminate the effects ofElectronic commutation motor controlVector control systemsPermanent magnet synchronous motorPermanent magnet synchronous generator
The invention discloses a parameter offline identification method for a permanent magnet synchronous motor under the condition of rest, belonging to the field of motor control and solving the problems of rotor external locking, overlong identification time, poor result consistency, poor practicability and the like of the existing parameter offline identification method for the permanent magnet synchronous motor under the condition of rest. The parameter offline identification method comprises the steps of: always keeping a rotor in a rest state, injecting a high-frequency voltage signal in a straight axis of a rotor winding, detecting a three-phase stator current and transforming into two-phase rotational coordinates, carrying out discrete Fourier transform on the current to obtain a straight axis high-frequency current amplitude so as to obtain a straight-axis inductance value through calculation; then injecting a high-frequency voltage signal in a quadrature axis of the stator winding, obtaining a quadrature axis inductance value by using the same method; and then introducing a linearly increasing current into the straight axis of the stator winding so as to obtain a voltage generating a corresponding current through reconstruction of a voltage of an inverter, calculating and fitting a straight slope by using a least square method by using a straight axis voltage value as a longitudinal coordinate and a straight axis current value as a transverse coordinate, and finally obtaining a slope value, wherein the slope value is a stator resistance value.
Owner:HARBIN INST OF TECH
Resonant switching power converter with adaptive dead time control
InactiveUS20100020569A1Improve efficiencyRelieve pressureTransformersEfficient power electronics conversionTransverterEngineering
A resonant switching power converter having adaptive dead time control provides improved efficiency along with reduced EMI / audible noise and component stresses. A dead time between pulses generated by a switching circuit is adaptively set in conformity with a value of the input voltage to the resonant switching power converter and an indication of a magnitude of the current passing through inductive element of the resonant tank of the converter. The indication of the current magnitude may be the switching frequency of the converter, or a measure of line or load current levels. The dead time can be obtained from a look-up table or computed from the current magnitude and input voltage values.
Owner:CIRRUS LOGIC INC
Portable power manager
A portable DC power manager (400) includes an internal power bus (410) and a plurality of device ports (1150, 1160, 1170, 1180, 1190, 1200) for connecting with external power and energy sources, external power loads and other external power managers. Each device port is isolated for the internal power bus by controllable switches (A, B, C, D). Power converters (440, 442, 510) may be disposed between device ports and the internal power bus to convert voltages and attenuate current amplitude. Energy management schema operating on the power manager sums available power and allocates the available power to connected power loads according to power priority settings. A hot-change-over circuit (1300) connects additional sources to the internal bus in response to a voltage drop on the internal power bus. A compact and lightweight package (1100) enables a portability.
Owner:REVISION MILITARY SOLDIER POWER LLC +1
Method for detecting and identifying dynamic bad data of electric power system
InactiveCN103324847AMeet development requirementsEfficient Economic DispatchSpecial data processing applicationsVoltage amplitudeElectric power system
The invention relates to the technical field of operation and control of an electric power system and discloses a method for detecting and identifying dynamic bad data of the electric power system. The method comprises the steps of A, reading a current network parameter and a network topology of the electric power system and forming a node admittance matrix and a branch circuit-node incidence matrix; B, establishing an equivalent circuit according to the network topology of the electric power system and configuring measurement functions and a power management unit (PMU) of the electric power system, wherein system measurement includes node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node trend measurement; C, detecting and identifying the dynamic bad data of the electric power system; D, judging the convergence condition. By means of the method, accidentally arisen bad data from a supervisory control and data acquisition (SCADA) system and in the PMU measurement can be found and eliminated, and accordingly an accurate operation state, voltage amplitude and phase angles of nodes of a power grid are obtained.
Owner:SOUTHWEST JIAOTONG UNIV
Method for assessing lightning flashover risks of regional power grid lines
ActiveCN102854415AComprehensive and detailed evaluation resultsElectrical testingFailure rateLightning strike
The invention discloses a method for assessing the lightning flashover risks of regional power grid lines, which comprises the following steps that: through calculating the lightning-resistant level of each base rod tower and combining with a probability distribution function of lightning current amplitudes of a region, the lightning trip-out rate of each rod tower is obtained, and the average lightning trip-out rate of a line is calculated; then, through combining with an automatic reclosing failure rate and a failure rate of manual forced energization, a permanent failure rate of the line is obtained; and through considering the weight coefficient of the line in a power grid structure, the permanent failure load loss coefficient of the line at the specific time of a power grid and in an specific operation mode of the power grid, and the risk occurrence probability of other influencing factors, a lightning flashover risk assessment model of a regional power transmission grid is established. According to the invention, the shortcoming that the absolute numerical value of the lightning trip-out rate can not really reflect the lightning disaster risk level of each line is overcome, and the lightning flashover risk level of each rod tower of lines is assessed through comprehensively considering the differences among the lightning motions, topographical features, line structures, insulation configuration, lightning protection measures and the like of each line corridor in the power grid, so that more comprehensive and thorough assessment results are obtained.
Owner:GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU +1
Low-temperature self-heating method for lithium ion battery
ActiveCN104064836ANo effect on service lifeReduced service lifeCell temperature controlInternal resistanceEngineering
The invention discloses a low-temperature self-heating method for a lithium ion battery. The method comprises the steps of determining a frequency range in which the service life of the lithium ion battery cannot be affected, and selecting frequencies of charging and discharging pulses according to the range; setting a pulse current amplitude value selection basis under a selected charging and discharging mode, and calculating a charging current amplitude value Ic and a discharging current amplitude value Id; performing no-life-loss heating on the battery to be heated according to charging and discharging pulse signals of the determined frequencies and the amplitude values, wherein the inner resistance of the self-heated battery is greatly reduced, and the charging performance is greatly improved. According to the technical scheme, the low-temperature self-heating method has the effects of high self-heating speed, obvious low-temperature performance improvement and no influence on the service life of the battery.
Owner:BEIJING BEIJIAO NEW ENERGY TECH CO LTD
Apparatus and method for controlling operation of reciprocating compressor
InactiveUS20060251523A1Inhibit currentAvoid distortionExternal parameterAC motor controlControl theoryCurrent amplitude
An apparatus and method for controlling the operation of a reciprocating compressor are capable of preventing distortion of a current applied to the reciprocating compressor by generating a current amplitude value for compensating a difference value between a stroke reference value of the reciprocating compressor and a stroke estimate value and outputting the current amplitude value in a form of a sine wave to the reciprocating compressor. The apparatus for controlling an operation of a reciprocating compressor generates a current amplitude value for compensating a difference value between a stroke reference value and a stroke estimate value of the reciprocating compressor and outputs the current amplitude value in a sine wave form to the reciprocating compressor.
Owner:LG ELECTRONICS INC
Motor drive system
ActiveUS20090243522A1Average power consumptionDC motor speed/torque controlSynchronous motors startersMotor driveInstability
In a drive system of an AC motor in which a motor current is feedback-controlled, a motor current command is produced in a normal operation according to a torque command value on an optimum efficiency characteristic line so as to select an optimum current phase maximizing an output torque with a constant motor current amplitude. Conversely, when the AC motor produces an excessively generated power exceeding a regeneratable power quantity of the AC motor, a consuming operation is performed for intentionally increasing the power loss in the AC motor. In the consuming operation, the motor current command is produced according to the torque command value on a loss increase characteristic line to change the current phase from the above optimum value. Thereby, the power loss in the AC motor can be increased to consume the surplus power without causing instability in the motor control.
Owner:DENSO CORP
Methods and apparatuses for control of a wearable transdermal neurostimulator to apply ensemble waveforms
ActiveUS20150328467A1Optimized for speedOptimize power usageElectrotherapyMedical devicesElectricityPower flow
Methods and apparatuses for controlling a wearable neurostimulator from a control apparatus. Described herein are methods and apparatuses for controlling the application of ensemble waveforms using a transdermal electrical stimulation by a neurostimulator having a processor. The controller may provide specifically configured commands to efficiently and accurately control the delivery of an ensemble waveform by the neurostimulator, wherein the ensemble waveform includes a sequence of component biphasic current waveforms in which one or more parameters (such as frequency, current amplitude, percent duty cycle, and percent charge imbalance) vary between sequential component waveforms particularly effective at evoking a desired cognitive state by TES.
Owner:THYNC GLOBAL INC
Motor drive system
ActiveUS7893637B2Average power consumptionDC motor speed/torque controlSynchronous motors startersMotor driveInstability
In a drive system of an AC motor in which a motor current is feedback-controlled, a motor current command is produced in a normal operation according to a torque command value on an optimum efficiency characteristic line so as to select an optimum current phase maximizing an output torque with a constant motor current amplitude. Conversely, when the AC motor produces an excessively generated power exceeding a regeneratable power quantity of the AC motor, a consuming operation is performed for intentionally increasing the power loss in the AC motor. In the consuming operation, the motor current command is produced according to the torque command value on a loss increase characteristic line to change the current phase from the above optimum value. Thereby, the power loss in the AC motor can be increased to consume the surplus power without causing instability in the motor control.
Owner:DENSO CORP
Variable drive for printhead
InactiveUS20050062804A1Digitally marking record carriersDigital computer detailsEngineeringControl theory
Owner:HEWLETT PACKARD DEV CO LP
Method for testing electric secondary AC loop
ActiveCN101251569AGuaranteed correctnessCorrect circuitEmergency protective circuit arrangementsFault locationBogieLow voltage
The invention relates to an electric secondary AC circuit detection method which comprises the following steps: before a power plant machine set is started, a low-voltage short-circuit point or a short-circuit bogie is input; three-phase 380 V voltage is added at the high-voltage side of a booster station to form a circuit by means of the impedance of a transformer and a generator; current amplitude and phase are measured through a current detecting apparatus to check polarity and transformation ratio in advance; all current protective directions such as generator differential motion are measured. When a neutral point is not connected, a short-circuit point is made at a high plant transformer low-voltage side, and the three-phase 380 V voltage is added at the neutral point of the generator, thereby realizing overall checkup of a generator AC circuit; then, the three-phase 380 V voltage is converted into one-phase voltage or two-phase voltage to carry out overall checkup of a zero sequence circuit. The detection method can check all CT and PT circuits of a generation-transformer group before power transmission; moreover, all protection directions of the generation-transformer group are checked in advance, thereby saving time and fuel oil along with economical efficiency, environmental protection and safety. The electric secondary AC circuit detection method can check secondary circuits such as the transformer and the bus differential protection of a transformer substation.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
Measurement method of solution electric conductivity
ActiveCN101135705AAccurate measurementFluid resistance measurementsMaterial resistanceElectrical resistance and conductanceMeasurement device
The method comprises: using a AC square wave current with a certain frequency (FH) to excite the electrode through a cable; making a synchronous detection for the response voltage waveform of the electrode to get a first mean voltage value; the first mean voltage value is divided by the current amplitude to get the resistance value (RH) of the first view; using a AC square wave current in another frequency (FL) to excite the electrode through a cable to make synchronous detection for the response voltage waveform to get a second mean voltage value; the second mean voltage value is divided by the current amplitude to get the resistance value (RL) of the second view; based on a mathematical model, getting the ratio relation of the inter-electrode resistance R to the RH, RL and FH, FL; based on it, getting the inter-electrode resistance value R; according to the electrode constant, getting the conductivity of the solution under test.
Owner:METTLER TOLEDO INSTR SHANGHAI
Sectional detection method of small current earthing fault of power system
InactiveCN1421704AIncrease amplitudeHigh detection sensitivityFault locationTransient stateElectric power system
The sectional detection method of small current earthing fault of power system, especially single phase long distance system, is suitable for system with several detection units in different sectionsof the line. Each unit variance in zero-sequence voltage or current is used as fault starting condition, the transient zero-sequence current amplitude and initial polarity are calculated, and the main station determines the fault section based on the fault information the detectors report. The basic criterion is that the transient zero-sequence currents on two sides of the fault point have opposite polarity and that each transient zero-sequence current amplitude is proportional inversely to the distance to the fault point. The said method is suitable for system with unearthed neutral point, earthed arc extinguishing coil or high earthing resistance as well as system with reactive load.
Owner:SHANDONG KEHUI POWER AUTOMATION
Power distribution unit branch protection
InactiveUS20110170223A1Low costSmall sizeElectric switchesArrangements responsive to excess currentElectrical FailureCurrent sensor
An apparatus and system are disclosed for protecting a power distribution unit from an electrical fault. A fuse interrupts a flow of electrical current in response to the electrical current rising above a current rating of the fuse. A current sensor measures the amplitude of the electrical current and outputs a current amplitude signal. A relay interrupts the flow of electrical current in response to an OFF signal. A fault module receives the current amplitude signal and sends the OFF signal to the relay in response to the amplitude of the electrical current exceeding a threshold value. The relay, the fuse, and the threshold value are selected so that a switching time of the relay is less than an opening time of the fuse for an amplitude of the electrical current between the threshold value and a maximum fault current value, so that the relay prevents the fuse from opening.
Owner:IBM CORP
Electric network thunderstorm damage distribution determination method
ActiveCN101261616ASolve the problem that it is impossible to clearly determine the distribution of lightning damage in the power gridSimple methodData processing applicationsMeasurement devicesLightning strikeStatistical analysis
Owner:WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +1
Apparatus for stimulating a muscle of a subject
InactiveUS20070293911A1Significant to useIncrease calorie expenditureElectrotherapyArtificial respirationElectrical impulsePhysical therapy
A method and apparatus for stimulating a muscle of a subject are provided. The apparatus comprises a signal generator for generating an electrical pulse signal of a frequency and a current amplitude for inducing contractions in the muscle, and an electrode apparatus for applying the signal to nerves associated with the muscle to be stimulated or adjacent the muscle of the subject for stimulating the muscle. The frequency and current amplitude of the electrical pulse signal are selected so as to maximize the bulk of the muscle being subjected to the contractions so as to generate a shivering phenomenon therein.
Owner:BIO MEDICAL RES
Method and System of Bracketing Stimulation Parameters on Clinician Programmers
The present disclosure involves a method of setting stimulation parameters for neurostimulation. A plurality of stimulation parameters available for bracketing is displayed. The stimulation parameters are selected from the group consisting of: stimulation current amplitude, pulse width, frequency, and contact location. Thereafter, in response to an input from a user, at least a subset of the stimulation parameters is selected for bracketing. A respective initial value is then obtained for each of the stimulation parameters in the selected subset. Thereafter, a bracketing process is used to generate a plurality of bracketed values for each of the stimulation parameters in the selected subset. The bracketed values are generated as a function of the initial value. A plurality of stimulation pulses is then delivered to a patient through a neurostimulator that is automatically programmed with a different combination of the bracketed values for the stimulation parameters for each stimulation pulse.
Owner:CIRTEC MEDICAL CORP
Method and apparatus for controlling a welding system
A method and apparatus for controlling a welding-type power supply includes providing a current wave form having an arc current portion and a short circuit current portion. An arc state is entered by retracting a welding wire, and a short circuit state is entered by advancing the wire. The current enters the arc current portion prior to the creation of the arc and the current enters the short circuit current portion prior to the creation of the short, by coordinating the wave form with the wire retraction. This may be preformed on a wire having a diameter of 2.4 mm or more to a weld and applying a welding current of less than 100 amps, or of less than 35 amps. One current waveform during the arc state includes at least three segments, and the last segment is entered into prior to the short circuit state being entered, and is the same current magnitude as the current magnitude at the start of the short circuit state. Penetration and / or bead formation may be controlled by controlling the advancement of the wire into the weld pool. The balance may be user set.
Owner:ILLINOIS TOOL WORKS INC
Methods and apparatuses for amplitude-modulated ensemble waveforms for neurostimulation
ActiveUS20150328461A1Optimized for speedOptimize power usageElectrotherapyMedical devicesElectricityEngineering
Methods and apparatuses for amplitude modulation of all or a portion of an ensemble waveform to modify a user's cognitive state by transdermal electrical stimulation (TES). An ensemble current waveform may include a sequence of component biphasic current waveforms in which one or more parameters (such as frequency, current amplitude, percent duty cycle, and percent charge imbalance) vary between sequential component waveforms. These ensemble waveforms may be specifically configured to evoke a particular cognitive state when applied by TES. In particular, described herein are methods for applying amplitude modulation to all or a sub-set of the component waveforms in the ensemble waveform which may dramatically enhance the efficiency and effectiveness of the TES. Also described herein are methods and apparatuses for applying amplitude modulation to all or a portion of an ensemble waveform without truncating pulses of the component waveforms forming the ensemble waveform.
Owner:THYNC GLOBAL INC
Method for grade parking (anti-backward sliding) of permanent magnet motor-driven pure electric vehicle
InactiveCN102198805AParking realizationPrevent slippingSpeed controllerElectrodynamic brake systemsControl vectorLoad torque
The invention discloses a scheme for controlling the grade parking of a permanent magnet motor-driven pure electric vehicle. The pure electric vehicle has an electrical system comprising a battery pack, a motor, a power converter, a motor controller and a vehicle controller and further comprising corresponding voltage, current and tilt sensors. The scheme comprises two steps of: (1) detection for the initial position of a rotor of a permanent magnet synchronous motor: a detection voltage is applied to the permanent magnet synchronous motor by the power converter, and the initial spatial position of the motor rotor in the case that the vehicle is stationary is calculated through a current feedback signal; and (2) torque self-balancing strategy based on vector control: the torque self-balancing characteristic can enable driving torque to track load torque automatically. The torque required by parking is calculated in accordance with the tilt angle of a ramp on which the vehicle is to be parked, and then, reasonable current amplitude and phase are given according to the initial position of the rotor and the torque required by grade parking in order to enable the driving torque to be equal to the load torque, therefore, stationary parking of the vehicle on the grade is realized.
Owner:瑾圣新能源科技(苏州)有限公司
Method for determining insulation and lightning impulse withstanding properties of same-tower double-loop power transmission line
InactiveCN102435921ATargetedScientificTesting dielectric strengthLightning impulse voltageLightning strike
The invention provides a method for determining insulation and lightning impulse withstanding properties of a same-tower double-loop power transmission line. The method comprises the following steps: determining the same-tower double-loop power transmission line to be determined, acquiring statistical parameters of lightning activities in an area in which the power transmission line is located and structural parameters of each pole tower and determining a lightning strike calculation cycle number Nl; sampling random parameters during a lightning strike process and determining lightning current amplitude, transient power frequency voltage and determination result that the lightning strike is shielding failure or back striking; judging whether tripping occurs in the pole tower after the certain lightning strike or not and carrying out statistics on the tripping times during the Nl lightning strikes according to the lightning current amplitude, the transient power frequency voltage and the shielding failure or back striking determination result, as well as the structural parameters of the pole tower, and calculating the lightning strike tripping rate; and determining the insulation and the lightning impulse withstanding properties of the power transmission line according to the lightning strike tripping rate and a target value. The determination method provided by the invention is small in error, high in precision and specific; and by adopting the determination method, design, operation and improvement of lightning protection measures of the same-tower double-loop power transmission line of an electric power department can be scientifically guided.
Owner:XINZHOU POWER SUPPLY COMPANY STATE GRID SHANXI ELECTRIC POWER +1
Method and system for correcting false wiring of three-phase four-wire watt-hour meter and watt-hour meter
The invention is applicable to the field of electric power and provides a method and system for correcting false wiring of a three-phase four-wire watt-hour meter and the three-phase four-wire watt-hour meter. The method for correcting false wiring of the three-phase four-wire watt-hour meter comprises the steps of: receiving a voltage phase angle, a current phase angle, a voltage current phase angle, a voltage amplitude and a current amplitude collected by the three-phase four-wire watt-hour meter; forming a vector diagram according to the voltage phase angle, the current phase angle, the voltage current phase angle, the voltage amplitude and the current amplitude; and judging whether a wiring fault exists according to the vector diagram, if so, searching a pre-stored false wiring database to determine whether the vector diagram exists, if not, obtaining the type of wiring fault corresponding to the vector diagram, and issuing a correcting instruction to the three-phase four-wire watt-hour meter according to the type so as to instruct the three-phase four-wire watt-hour meter to correct false wiring. The technical scheme provided by the invention has the advantages of detecting wiring faults remotely and correcting wiring faults remotely.
Owner:SHENZHEN RENERGY TECH
Electric power system dynamic state estimation method based on synchronous phase-angle measuring device
InactiveCN103326358AImprove recognitionEnhanced ability to identify topology errorsData processing applicationsSystems intergating technologiesVoltage amplitudeElectric power system
The invention relates to the technical field of electric power system operation and control and discloses an electric power system dynamic state estimation method based on a synchronous phase-angle measuring device. According to the technical scheme, the method comprises the steps of A, reading current network parameters of an electric power system and a network topological structure of the electric power system, and therefore forming a node admittance matrix and a branch-node incidence matrix; B, establishing an equivalent circuit according to the network topological structure of the electric power system, and configuring a measurement function of the electric power system and a PMU of the electric power system, wherein the measurement of the system comprises node voltage amplitude measurement, node current amplitude measurement, node power injection measurement and node load flow measurement; C, conducting dynamic state estimation on the system on the basis of extended Kalman filtering; D, judging conditions of convergence. According to the electric power system dynamic state estimation method based on the synchronous phase-angle measuring device, due to the introduction of the PMU, real-time and accurate measurement information such as the voltage and the phase angel can be supplied to the system, the higher measurement redundancy rate of the system is obtained, and therefore the precision of the state estimation is improved. The electric power system dynamic state estimation method based on the synchronous phase-angle measuring device has the advantages of being good in robustness, high in state estimation precision and good in convergence performance.
Owner:SOUTHWEST JIAOTONG UNIV
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