61 results about "Admittance parameters" patented technology

The invention discloses a parameter extraction method for InP HBT small-signal models, which mainly solves the problems of the prior art, i.e. complex extraction process and inaccurate extraction results. The technical scheme of the invention is as follows: an open circuit soldering point structure and a short circuit soldering point structure are adopted to analyze an equivalent circuit to extract parasitic parameters; a collector open circuit state is adopted to analyze the equivalent circuit to extract external resistance parameters; a circuit network theory is utilized to analyze the scattering parameter S, impedance parameter Z and admittance parameter Y of the intrinsic part of an InP HBT device; and a layer-by-layer stripping method is adopted to determine a fixed expression for each intrinsic model parameter to extract intrinsic parameters. The parameter extraction method has the advantage of accurate, rapid and visual parameter extraction. A simulation result shows that a small-signal model result extracted by the method can perfectly fit the scattering parameter S of an actual device-testing result and can be used for directing circuit design and the determination of a large-signal model peripheral circuit.

The invention discloses a robot admittance compliance control method and system. The robot admittance compliance control method comprises the following steps: detecting an operating force applied to arobot, and detecting movement velocity and acceleration of the robot; and inputting the operating force, the movement velocity and the acceleration into a trained neural network model, and outputtingadmittance parameters by the neural network model, wherein the admittance parameters comprise virtual damping and virtual mass. A compliance control algorithm realized by virtue of the neural networkmodel in the invention can change admittance parameters of a robot system in real time according to stiffness changes, namely different forces externally applied to the robot, of a human-computer interaction environment.

The invention relates to an establishing method for an improved HBT (Heterojunction Bipolar Transistor) small-signal equivalent circuit model. The establishing method comprises the following steps: 1) extracting an inter-polar metal lead overlap capacitance parameter; 2) extracting an intrinsic parameter: peeling off a bonding pad stray parameter and a component resistance parameter from a complete HBT diffusion parameter, performing add and subtract operation on the acquired resistance parameter Zint, taking a real part and an imaginary part, and respectively acquiring a base internal resistance Rbi and a base diffusion capacitance Cbi, and (2) peeling off the Rbi and Cbi from the resistance parameter Zint, converting, utilizing the acquired admittance parameter Yqint to extract a resistance parameter, a capacitance parameter, a mutual conductance parameter and a delay time; 3) utilizing the four parameters: the inter-polar metal lead overlap capacitance parameter, the intrinsic parameter, the bonding pad stray parameter and the component resistance parameter, to acquire the HBT small-signal equivalent circuit model. According to the establishing method provided by the invention, the metal lead overlap capacitance and the base diffusion capacitance Cbi are introduced, so that the simulation precision of the HBT small-signal equivalent circuit is increased.

The invention discloses a power transmission line double-end fault positioning method and system based on golden section search. The method comprises the steps of collecting the positive sequence voltage and positive sequence current at a double-end bus of a line at a fault moment when a short-circuit fault happens to a power transmission line, and listing a voltage calculation equation along theline by combining with a line impedance admittance parameter; selecting two test points on the line with the short circuit fault according to the golden section proportion; and respectively comparingthe double-end reckoning voltages of the two test points according to the voltage calculation equation along the line so as to judge a fault interval. The method is based on the voltage distribution characteristics along the line of the lumped parameter model, and the fault point is the minimum value point of the positive sequence voltage distribution curve, so that the search algorithm can be used for infinite approximation until the positioning precision requirement is met. The calculation pressure can be reduced, and meanwhile, the iteration speed is higher. The fault positioning calculation efficiency and reliability are effectively improved.

The invention provides a method and device for reducing application installation packages and electronic equipment. The method includes the steps that a class file corresponding to applications is created through script languages; original admittance parameters in program files in project files corresponding to the applications are preprocessed, and new admittance parameters corresponding to the program files are obtained; the new admittance parameters and functional codes in the program files are copied in the class file, and new project files corresponding to the applications are generated. Thus, content of all the program files obtained after projects are completed is put in the class file, the class file only comprises a package head, therefore, the sizes of the application installation packages are reduced, the space occupied by the application installation packages and the flow consumed in the downloading process are saved, the downloading speed of the application installation packages and the use rates of the applications are increased, and user experience is improved.

The invention relates to an alternating-current component transmission modeling and parsing method along line in operation of a high-voltage direct current in different ways. The method comprises: firstly, an impedance admittance parameter of a line with a unit length is calculated according to a direct-current line pole parameter in a direct-current project; secondly, a uniformly distributed parameter circuit of a single-loop long-distance line is processed to be equivalent to a single loop type equivalent circuit and a correlated parameter is solved; thirdly, an equivalent circuit of a positive-negative dual-loop direct-current power transmission line with the unit length in the direct-current project is decoupled by using a phase-mode transformation matrix; fourthly, a central parameter impedance value and a ground admittance value in the positive-negative dual-loop with the unit length are converted into a distributed parameter impedance value and a ground admittance value; and fifthly, with combination of the direct-current line length in the high-voltage direct-current power transmission project as well as boundary conditions in different operation ways, an operation equivalent circuit diagram of a high-voltage direct-current power transmission system is transformed to obtain alternating-current component along-line transmission and parsing models of the high-voltage direct-current power transmission system in different operation ways.

The invention relates to an ultrahigh-voltage overhead-cable hybrid power transmission line order parameter measurement method. Positive-order parameter measurement comprises the following steps: system trends change according to demands of a scheduling portion, three-phase voltage and current phasors of the two sides of a hybrid line are obtained through measurement before change and measurement after the change, and positive-order voltages and positive-order currents of the two sides are obtained through the measurement of the two times; T-type equivalent circuit positive-order impedance parameters of the whole hybrid line are solved; T-type equivalent circuit positive-order admittance parameters of an overhead line section and T-type equivalent circuit positive-order admittance parameters of a power cable section are solved; T-type equivalent circuit positive-order impedance parameters of the overhead line section and T-type equivalent circuit positive-order impedance parameters of the power cable section are solved; and positive-order impedance and positive-order admittance parameters of a unit length of an overhead line and a power cable are solved. The measurement method provided by the invention has quite high accuracy.

The invention provides a modeling method, device and system of the electromagnetic interference of a DC brush motor. The method includes the steps of obtaining target measurement data corresponding tomodel parameters of an equivalent circuit model, wherein the equivalent circuit model is a model established based on electromagnetic interference generated by the DC brush motor, and the model parameters include common-model admittance parameters, different-model admittance parameters and current parameters of a current source; determining model parameters of the equivalent circuit model based on the target measurement data, and obtaining the equivalent circuit model with the model parameters to serve as the model of the electromagnetic interference of the DC brush motor. The modeling methodis simple, high in universality and engineering practicability and beneficial for predicting, analyzing, and improving the electromagnetic compatibility, improving the research and development efficiency and reducing the development cost in the design and development process; the established electromagnetic interference model can be used as a component in analysis of the electromagnetic compatibility of an electronic and electric system with the DC brush motor, and the system-grade electromagnetic compatibility design efficiency can be easily improved.

The present invention relates to a single-phase transformer high-frequency model establishing method based on a VF method, which is characterized by comprising the following steps of: using a single-phase transformer as a two-port network and measuring a scattering parameter of the single-phase transformer; converting the scattering parameter into admittance parameters to obtain admittance parameters of three branch circuits to be fit and respectively carrying out fitting on the admittance parameters of the three branch circuits to be fit by applying a vector matching method; and according to an admittance parameter expression obtained after fitting, establishing an inverted U-shaped equivalent circuit of the admittance parameter expression by applying a circuit comprehensive theory so as to obtain a single-phase transformer high-frequency model. According to the present invention, the black box design idea is adopted; and the single-phase transformer high-frequency model can be widely used for simulating calculation of an overvoltage, a lightning overvoltage and the like so as to provide reference for power operation personnel.

The invention provides an asymmetric power transmission line parameter on-line measuring method. The method includes following steps: step 1, synchronous measuring apparatuses are arranged at two ends of a measured line, voltage and current signals at two ends of the measured line are measured in a synchronous manner via the synchronous measuring apparatuses, and m (m>=2) different measurements are performed; step 2, Fourier transform of m groups of voltage and current signals at two ends of the measured line obtained by step 1 is performed, m groups of power frequency voltage phasors and current phasors at two ends of the measured line are calculated, and the phasors comprise voltage and current phasors at head terminals of the measured line from the first group to the mth group and voltage phasors and current phasors of bottom terminals; step 3, self admittances Ya, Yb, and Yc of A, B, and C phases of the measured line and mutual admittances Yab, Ybc, and Yac of each phase are calculated; and step 4, self impedances Za, Zb, and Zc of the A, B, and C phases of the measured line and mutual impedances Zab and Zbc of each phase are calculated. According to the method, parameters of the self impedance and the self admittance of each phase and parameters of the mutual impedances and the mutual admittances between the phases, parameters of positive-sequence and zero-sequence impedances and admittances, and parameters of sequence coupling impedances and admittances between sequences can be calculated.

The present invention relates to a method of and arrangement for determining non-linear behavior of a device (40) under test, wherein the device (40) is excited by a test signal on relevant device terminals under different termination conditions and the emitted signals at the fundamental and harmonic frequencies are measured at the relevant device terminals. Then, calibration measurements taken on calibration standards of known impedance and linearity are performed to derive parameters needed to correct the raw data read by the measurement for cable loss and delay and for non-linear behavior of the measurement system. Finally, non-linear scattering or admittance parameters are extracted from the error corrected measurements taken at different excitation and termination conditions. Thereby, the non-linear behavior can be more accurately characterized, modeled and understood.

The invention discloses a harmonic-component-based anti-interference capacitance measurement method for an untransposed transmission line. Big enough third harmonic is generated in a measurement line through a saturable transformer, a GPS-based synchronous measuring unit is utilized to measure the triphase voltage and the triphase current at the head end and the tail end of the line, and the Hanning windowed FFT interpolation algorithm is adopted to treat the voltage and the current at the head end and the tail end of the line so as to obtain triple harmonic components of the triphase voltage and the triphase current at the head end and the tail end. Meanwhile, in consideration of unequal mutual parameters between two phases of the untransposed transmission line, the harmonic components are utilized to solve the self-admittance and interphase transadmittance parameters of all phases based on a lumped parameter model of the transmission line, and all-sequence capacitance parameters are obtained. The harmonic-component-based anti-interference capacitance measurement method eliminates influence on capacitance measurement of a measured line from power frequency interference of a nearby charged operation line, greatly improves the measurement accuracy and can meet the demands of actual project measurement.

The invention discloses a fault positioning method and system based on positive sequence voltage distribution characteristics, which belong to the field of power distribution network fault positioning. The method comprises the steps of detecting a power distribution network in real time, and extracting positive sequence voltage, positive sequence current, line impedance and admittance parameters of two ends of a line at a fault moment; respectively taking two ends of the fault line as starting points, deducing positive sequence voltage distribution along the fault line, and determining an initial fault positioning interval; utilizing the positive sequence voltage distribution along the line to respectively construct difference voltage distribution taking two ends of the fault line as starting points; and obtaining a final fault positioning interval according to the slope of the positive sequence voltage distribution curve along the line, the initial fault positioning interval and the slope of the difference voltage distribution curve. According to the invention, the problem that a distance measurement result has a large error due to the fact that the steepness of a voltage curve islow when a fault occurs under the working conditions that the branch line length coefficient of the distribution feeder line is small, the line length is short and the like is solved, and the reliability and accuracy of double-end fault positioning are effectively improved.

The invention discloses an equivalent three-phase short circuit calculation method which considers an outer network ground branch circuit and sensitivity information. Firstly, whole-network basic data including system element parameters, a topology structure and a trend calculation result under a normal running condition is input, then based on a sensitivity consistency equivalent method, an equivalent network is constructed, through a sensitivity weighing method, ground branch circuit admittance parameters are deducted, and according to trend, sensitivity and power transfer characteristic consistency, other parameters are solved. Finally, an improved equivalent method is applied to three-phase short circuit calculation, through the adoption of a node impedance method and a superposition theorem and based on the trend calculation result, a short circuit point current under a three-phase short circuit fault of an inner network, all node short circuit voltages and all branch circuit short circuit currents are calculated.

The invention relates to an equivalent circuit parameter generation method, a multiplexer de-loading method and a multiplexer de-loading device. The equivalent circuit parameter generation method comprises the steps of performing de-phasing loading processing on an original scattering parameter of a to-be-debugged filter in a to-be-debugged multiplexer to obtain a target scattering parameter; converting the target scattering parameter to obtain a corresponding original admittance parameter; subjecting the original admittance parameter to unloading processing of a loading parameter of a common cavity to obtain a target admittance parameter; extracting a pole in the target admittance parameter and a residue corresponding to the pole; and generating equivalent circuit parameters according to the pole and the residue corresponding to the pole. By adopting the method, the multiplexer can be debugged by using a low-cost network analyzer, so that the debugging cost of the multiplexer can be greatly reduced.

The invention discloses a method for calculating a maximum voltage withstanding position of a zero load high voltage power cable. The method comprises the following steps: resistance per unit length, inductance, capacitance and admittance parameters of a cable loop are calculated according to cable structure parameters; an attenuation coefficient and a phase position coefficient per unit length of the cable are calculated based on the resistance, inductance, capacitance and admittance parameters; the attenuation coefficient and the phase position coefficient are applied to a sine wave function, a sine wave propagation function is built, a calculating model for maximum voltage withstanding capability of all points along the cable is built via a sine wave propagation rule based on the sine wave propagation function, and the maximum voltage withstanding position of the cable can be calculated. The method can help solve a problem that currently no method for calculating the maximum voltage withstanding position of the zero load high voltage power cable is available; analysis guidance can be provided for cable transient breakdown faults in high voltage power frequency operation, variable frequency voltage withstanding tests, damping oscillatory wave tests and the like in a long distance zero load cable line; a data basis can be provided for fault cable line breakdown accident simulation tests.

The invention discloses a method for estimating the parameters of an incompletely commutated three-phase power transmission line based on PMU measurement, including the estimation of 12 admittance parameters and the estimation of 12 impedance parameters. The beneficial effects are as follows: the method for estimating the parameters of an incompletely commutated three-phase power transmission linebased on PMU measurement overcomes the shortcomings of the previous parameter estimation methods; the estimation errors of self-impedance and self-admittance parameters are less than 1%, and the estimation errors of mutual-impedance and mutual-admittance parameters are less than 2%; and more accurate power transmission line parameters can be provided for an energy management system, so that the error parameters of an incompletely commutated three-phase power transmission line can be identified accurately and calibrated in time and online.