38 results about "Matrix pencil" patented technology

The invention discloses an online evaluation method of electric power system dynamic stability. The online evaluation method comprises the steps of step 1, carrying out high-frequency sampling by utilizing a PMU (Power Management Unit), and extracting an oscillation mode for sampling data by utilizing a matrix pencil identification method; step 2, detecting low-frequency oscillation, and emitting low-frequency oscillation warning if a damping ratio of the detected oscillation mode is lower than a set threshold value; step 3, carrying out small perturbation calculation on a system model in a current running mode through a frequency domain analysis method, and obtaining a characteristic value, a characteristic vector, a corresponding unit and participated factor information; and step 4, screening out information of a low-frequency oscillation mode from a small perturbation calculation result according to the low-frequency oscillation mode which is determined by the matrix pencil identification method, regulating a related electric power generator to output, and obtaining tide stability limit of call lines between related domains through time-domain simulation at the same time. According to the online evaluation method disclosed by the invention, the influence of noise is effectively avoided, the identification accuracy is improved, the calculating speed and the calculating efficiency are increased, and the online dynamic safety evaluation effect of the electric power system is obviously improved.

The invention discloses a multichannel direct current added damping control device capable of simultaneously restraining sub-synchronization and low frequency oscillation, and a parameter setting method of the multichannel direct current added damping control device. The device is characterized in that the device identifies the subsynchronous oscillation, the low frequency oscilation frequency and the damping of a direct current under island running and a system reduced-order model on the basis of a matrix pencil algorithm which has high operation efficiency and anti-interference capacity, a multichannel direct current added damping controller is designed through a root locus method so as to reduce mutual effects between oscillation modes, and sub-synchronization and low frequency oscillation can be simultaneously restrained. Electric generator rotating speed signals are divided into multiple frequency bands according to results of analysis conducted on characteristics of system oscillation through the matrix pencil algorithm, a passageway corresponding to each frequency band can independently adjust the gain, the phase position, the output amplitude limit and the filter parameters, and therefore appropriate damping can be provided for sub-synchronization and low frequency oscillation in different frequency bands. The device is efficient and easy to obtain, and the function of simultaneously restraining sub-synchronization and low frequency oscillation through the direct current added damping controller is achieved for the first time in the high voltage direct current transmission field.

The invention provides a motor rotor eccentricity fault diagnosis method based on a completely self-adaptive matrix pencil, solves the defects of a conventional matrix pencil algorithm on the aspect of motor rotor eccentricity fault diagnosis, and has double effects of self-adaptive threshold truncation and self-adaptive fundamental wave trap filtering. The singular value truncation threshold of the matrix pencil is self-adaptively adjusted by calculating the maximum likelihood estimation of a singular value matrix; meanwhile, a completely self-adaptive trap fundamental wave current component can be realized by utilizing the singular value matrix in the matrix pencil. The required current acquisition time length is quite low and is less than 1 second (10kHz sampling frequency) so that the method is suitable for the application occasion of slow changing of motor loads; and self-adaptability to the trap current fundamental wave component can be realized, and precision of eccentricity fault diagnosis characteristics is high without possibility of misjudgment basically. The truncation threshold of the singular value matrix is self-adaptively set according to different rotating speed and different loads of a motor without possibility of failure of the diagnosis method.

The invention relates to a UKF and PF combined phase unwrapping algorithm. A UKF algorithm and a PF algorithm are combined and applied to unwrapping of a phase wrapped image, a phase quality graph is used to unwrap the wrapped phase long a path from high quality to low quality of an interferogram, and a local phase gradient estimation algorithm based on a corrected matrix pencil model is combined. The phase unwrapping algorithm comprises the following steps that (1) related data of unwrapping a wrapped phase diagram is obtained; (2) each wrapped interferogram pixel is unwrapped preliminarily via the UKF algorithm; and (3) the wrapped interferogram pixels unwrapped preliminarily are further unwrapped via the PF algorithm. According to technical schemes of the invention, UKF and PF themselves have certain noise inhibition capability, the difficulty and complexity of a prepositioned filter can be reduced, even a prepositioned pre-filtering step can be omitted from processing of the noise included interferogram, and the wrapped pixels can be unwrapped accurately and stably in high efficiency.

The invention relates to the field of identification of electric power system low-frequency oscillation modes, and in particular relates to an electric power system low-frequency oscillation mode identification method based on Matrix Pencil. Aiming at solving the problem that measured data obtained by ac actual system is usually influenced by site environment and other factors and thereby is signal data with a certain signal to noise ratio, the method proposes to utilize ESPRIT to improve the Matrix Pencil algorithm, decompose a signal space into a signal sub-space and a noise sub-space by directly adopting a data matrix composed of measured data as a basis, accurately estimate a model order, and detect oscillation frequencies, decay factors, oscillation amplitudes, phases and other information of the low-frequency oscillation signals of an electric power system in different oscillation modes, and thereby computational efficiency and low-frequency oscillation identification capability can be effectively improved. The method is applicable to the electrical power systems and other relevant departments for identifying low-frequency oscillation modes of the electrical power systems.

The invention discloses a resonance grounding system single phase grounding fault section positioning method utilizing phase voltage current break variable phase characteristics. The method comprises steps that step 1, a break variable of a phase voltage and a break variable of a phase current of each data acquisition device are calculated; step 2, phases of all frequency components of the phase voltage break variables and the phase current break variables are calculated through utilizing a matrix pencil algorithm; step 3, phase angle difference dph (50) of a phase voltage break variable power frequency component and a phase current break variable power frequency component of one same acquisition device is acquired; step 4, phase angle difference dph (fm) of any high frequency component of the phase voltage break variable and any high frequency component of the phase current break variable is calculated; step 5, an absolute value dj of the difference of the dph (50) and the dph (fm) is calculated; and step 6, magnitudes of all the dj are determined, and a fault section is identified. The method is advantaged in that zero sequence voltages and currents are not required, the phase voltage and the phase current of each phase are only required, compared with a resonance grounding system section positioning method based on the zero sequence voltages and currents, the method has further has properties of autonomy, no need of filtering and easy realization.

The invention relates to a ground surface medium parameter inversion method based on single-base measurement, and relates to a ground penetrating radar. The method carries out the inversion of the medium parameters and conductivity of the ground surface through employing a measurement result of ground vertical incidence through a single antenna. The method comprises the steps: firstly carrying out testing and obtaining a reflection signal S11 when a single horn antenna vertically irradiates a soil surface or a metal plate based on a vector network analyzer; secondly introducing a Matrix Pencil (matrix beam) algorithm according to the testing result, and carrying out the recognition and separation of reflection signals of different interfaces; thirdly carrying out estimation and extracting a true reflection signal caused by the soil surface or the surface of the metal plate, thereby obtaining the real reflection coefficient of the soil surface. The method can effectively discriminate the reflection components of all interfaces, can filter out non-soil-surface reflection signals and other noise signals, enables the estimation precision to be improved, and is of great significance to the quick and accurate obtaining of the electromagnetic parameters of the soil surface.

The invention discloses an improved matrix pencil algorithm based stationing method for an additional damping controller of a multi-infeed direct current system. The improved matrix pencil algorithm based stationing method for the additional damping controller of the multi-infeed direct current system is characterized in that a matrix pencil algorithm is improved to identify power angle oscillation data to calculate direct current control sensitive factors of a dominant oscillation mode to confirm a best direct current additional damping controller installation site of the dominant oscillation mode. The improved matrix pencil algorithm based stationing method for the additional damping controller of the multi-infeed direct current system has the advantages of improving the calculation efficiency and the anti-interference capability due to improvement of the matrix pencil algorithm, enabling controller control costs of the dominant oscillation mode and interaction of the controller to be fully considered, providing a direct current control sensitive factor concept and accurately positioning the best installation site of the direct current additional damping controller.

The invention discloses a resonant grounding system single-phase grounding fault section positioning method integrated with high-frequency and power frequency zero-sequence component phase features, and the method comprises the steps: 1, processing a zero-sequence voltage and zero-sequence current, collected by each data collection device, through a matrix pencil algorithm, and obtaining the phases of all frequency components of the zero-sequence voltage and the zero-sequence current; 2, calculating the phase angle difference dph(50) of a zero-sequence voltage power frequency component and a zero-sequence current power frequency component of the same collection device; 3, calculating the phase angle difference dph(fm) of any one high-frequency component of the zero-sequence voltage and any one high-frequency component of the zero-sequence current; 4, calculating the absolute value dj of the difference between the phase angle difference dph(50) and the phase angle difference dph(fm); 5, recognizing a fault segment according to the size of dj. The method makes the most of the features of the high-frequency and power frequency components. Compared with a conventional resonant grounding system section position method based on transient features, the method does not need to carry out filtering.

The invention discloses an arrival direction estimation method combining a matrix pencil and root extraction MUSIC. The method comprises the following steps S1, a block Hankel matrix is constructed, aself-correlation data matrix is further obtained, a noise subspace and a signal subspace are obtained via singular value decomposition, and a matrix pencil equation is constructed; S2, a first dimension direction cosine is solved via the matrix pencil equation, and a repetition characteristic value is determined via actual value mapping; S3, an actual characteristic value is mapped to a revertingvalue space, an arithmetic average of repetition characteristic value parameters is obtained, and a one-dimensional guiding vector is constructed; S4, a polynomial is constructed via an orthogonalityequation, and a second dimension direction cosine parameter is solved via the polynomial. The method can be used for well solving a problem of multi-angle obscurity caused by the repetition characteristic value, automatic matching between space azimuths and elevation angles can be finished, solving of a repetition matrix pencil characteristic value and an extra pairing method can be prevented, method complexity can be lowered to a certain degree, method adjustment can be performed according to actual needs, and a space parameter estimation order can be changed.

Disclosed are a system and a method for an indoor location determination using a matrix pencil. The system comprises a transmitter node that creates and transmits a transmission packet having a plurality of same symbols. A receiver node receives the transmission packet, calculates a delay time by using the symbols in the transmission packet and a matrix pencil algorithm, and calculates a distance between the transmitter node and the receiver node by using the delay time. The delay time estimation using the matrix pencil can reduce an error ratio and therefore can estimate more exactly the distance between the nodes.

The invention discloses a phase unwrapping algorithm based on UIF (unscented information filtering). The phase unwrapping algorithm comprises the following steps of firstly, establishing an UIF phase unwrapping algorithm recursive state estimation model, utilizing a phase gradient estimation method based on an AMPM (amended matrix pencil model) to obtain the phase gradient information required by the recursive state estimation model, and utilizing an LEVENBERG-MARQUARDT method to optimize the recursive state estimation model, so as to improve the algorithm convergence; introducing a heapsort quick mass map guide strategy, using the adjacent wrapping pixel of the unwrapped pixel as a heap array of a to-be-unwrapped pixel, and adjusting the heap array as the maximum heap according to the quality value of the to-be-unwrapped pixel; in each unwrapping step, utilizing the UIF phase unwrapping algorithm recursive state estimation model to unwrap the optimum to-be-unwrapped pixel at the root node of the heap array, deleting the pixel from the heap array, and adjusting the heap array as the maximum heap, until the phases of all wrapped pixels are unwrapped. The phase unwrapping algorithm has the characteristics that the accuracy is higher, and the stability is higher.

The invention discloses a multiple passive intermodulation generation points positioning method based on a matrix pencil method, two coherent signal sources are put in a to-be-detected device to generate a plurality of passive intermodulation signals which are combined as one composite signal, and the amplitude and the phase of the signal are measured and obtained; the scanning frequency is measured for several times, the amplitude and the phase data of the composite signal are obtained and processed, the matrix pencil method is utilized to obtain the approximate position and the relative amplitude, a passive intermodulation generation threshold value is utilized to acquire the quantity of the generation points and the position information. According to the invention, under the prior condition of no need for having the possible position or quantity of passive intermodulation, the position information and amplitude of the passive intermodulation generation points can be accurately judged, a problem for positioning a plurality of passive intermodulation points can be effectively solved, and the method has robustness for noise.

The invention discloses a capacitor voltage transformer unit impulse response solution method based on square-wave pulse. The method comprises the following steps: under an offline state, high-voltagepulse is injected into the high voltage input end of a capacitor voltage transformer, and data collectors are connected to the high voltage input end and the low voltage output end to be used for collecting signals according to the same sampling frequency; matrix pencil denoising fitting is performed on obtained signals of all the ends; a recursion formula and a linear equation system are designed according to a finite length convolution formula, and convolution inversion operation is performed on denoised signals to obtain unit impulse response of the capacitor voltage transformer. The method disclosed by the invention solves the problem of inaccurate transmission characteristic calculation caused by internal unknown-parameter stray capacitance in the prior art. When the capacitor voltage transformer unit impulse response solution method based on square-wave pulse is utilized, the high-voltage pulse is injected into the high-voltage end of equipment, the voltage signals are collectedat the high-voltage injection end and the low-voltage output end, and the finite length convolution formula is utilized to perform deconvolution and calculate out system unit impulse response.

The invention relates to an array antenna damaged unit diagnosis method based on a matrix beam method, and the method comprises the steps: S1, obtaining the original excitation of an array antenna and the position distribution of antenna units, and carrying out the sampling; S2, establishing a Hankel matrix by using the sampled directional diagram data, and performing singular value decomposition on the Hankel matrix; S3, selecting a singular value to carry out low-rank Hankel matrix approximation, and PERFORMING solving to obtain a generalized eigenvalue; S4, obtaining the original excitation of the damaged unit according to the position distribution of the damaged unit; S5, screening out units with small excitation amplitudes in the step S4, correcting the positions of the damaged units, and calculating generalized characteristic values of the positions of the corrected damaged units; and S6, repeating the step S4 to obtain the corrected damaged unit position and the corresponding unit excitation. According to the array antenna damaged unit diagnosis method provided by the invention, the position and excitation of the damaged unit of the array can be quickly diagnosed, the sensitivity to noise is extremely low, and the diagnosis of the array can be completed under relatively strong noise interference.

The invention discloses a harmonic degradation analysis method for a parameter-unknown grid-connected inverter based on impedance fitting, and the method comprises the following steps: S1, collecting frequency response data of the grid-connected inverter, converting the frequency response data into time domain data, and calculating an initial order and an initial pole through a matrix pencil algorithm; S2, updating a pole, estimating a residue, a first term and a constant term by using vector matching, and performing impedance fitting to obtain a frequency response fitting value; S3, calculating the relative error percentage of the frequency response fitting value and the actually measured frequency response data, comparing the relative error percentage with a given threshold value, if the relative error percentage is greater than the given threshold value, updating the initial parameter, repeating S2 to form iteration until the relative error percentage is less than the given threshold value, and outputting an impedance fitting result; and S4, based on a fitting result, searching a harmonic resonance point through an impedance analysis method. According to the method, impedance fitting is carried out on the grid-connected inverter with an unknown structure, parameters and a control mode based on frequency response data, the time consumption of iterative calculation is short, and the precision of a fitting result is high.

The invention discloses a sparse linear array radar arraying method based on low-rank Hankel matrix completion, and belongs to the field of array radar signal processing. A Hankel matrix is constructed and low-rank completion is carried out on the Hankel matrix, so that an ideal directional diagram is generated and sparse arrangement is realized. According to the method provided by the invention, only a few sampling points on a main lobe need to be approached, and only an upper limit level needs to be set for a side lobe region, so that the number of array elements is reduced, and meanwhile, the dependence on a reference directional diagram and the calculation amount can be reduced to a certain extent. Compared with a matrix pencil method (MPM), the method has the advantages that all sampling points do not need to be approached, the degree of freedom can be saved, only individual sampling points on a main lobe are selected for approaching, and an integral level constraint is applied to a side lobe, that is, elements on an anti-diagonal line of a Hankel matrix are constrained, so that the degree of freedom can be reduced; therefore, an optimization problem of rank minimization is constructed.

The invention relates to the technical field of electromagnetic compatibility, and in particular relates to a transient response analysis method for a transmission line system terminated with a frequency-variable load. The method comprises the following steps: firstly, measuring or calculating the admittance of a frequency-variable load port at a sampling frequency point to obtain corresponding sampling admittance, and carrying out equivalence on the admittance of the port by adopting a rational function approximation mode; secondly, solving a pole and a residue required by a rational approximation function by adopting a matrix pencil method, and substituting the pole and the residue into a piecewise linear recursive convolution technology to realize piecewise linear recursive convolution expression of voltage at a connection point of the transmission line and the frequency-variable load; and finally, realizing transient response analysis of the transmission line system with the frequency-variable load in combination with a transmission line equation. According to the method, the matrix pencil method (MPM) and the piecewise linear recursive convolution (PLRC) technology are combined, transient response analysis of the transmission line system of the terminating frequency-variable load is achieved, meanwhile, the method has the advantages of being rapid in calculation and high in applicability, and the method can be applied to analysis of the electromagnetic compatibility problem in the fields of electric power, control, communication and the like.

The invention discloses a channel prediction method based on a matrix bundle, which considers the actual problem of multipath time delay change caused by user side movement, and obtains the rule of time delay change by constructing a three-dimensional matrix bundle and estimating time delays at different moments aiming at the time-varying characteristic of a channel, especially the influence of the time delay change on the channel. According to the method, a multi-path azimuth angle, a pitch angle, time-varying delay and Doppler parameters are respectively estimated based on a matrix pencil super-resolution method, and a channel is reconstructed based on the estimated channel parameters, so that the adverse effect of outdated channel state information (CSI) on communication can be effectively overcome, and accurate prediction of a future time-varying channel is realized.