38 results about "Matrix pencil" patented technology

The invention provides a motor rotor eccentric fault diagnosis method based on a fully adaptive matrix beam, which solves the shortcomings of the traditional matrix beam algorithm in the motor rotor eccentric fault diagnosis, and has dual functions of adaptive threshold truncation and adaptive fundamental wave notch filtering Effect. By calculating the maximum likelihood estimation of the singular value matrix, the singular value truncation threshold of the matrix bundle is adaptively adjusted; at the same time, the present invention utilizes the singular value matrix inside the matrix bundle to realize fully self-adaptive trapping of the fundamental wave current component. The time length of the current collected by the present invention is very short and does not need to exceed 1 second (10kHz sampling frequency), so it is suitable for applications where the motor load changes slowly; the self-adaptive notch current fundamental wave component, and the eccentricity fault diagnosis characteristic accuracy is high , there is basically no possibility of misjudgment. According to the different rotation speeds and different loads of the motor, the threshold value of the singular value matrix truncation is adaptively set, and there is no possibility of failure of the diagnosis method.

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 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 provides a frequency band self-adaptive acquisition method for single-phase grounding line selection of a distribution network. When a single-phase ground fault occurs in the distribution network, the zero-sequence current of each outgoing line can be divided into a common mandatory component under the action of zero-sequence voltage and a free component generated by the charging and discharging of inductive and capacitive elements related to the parameters of the line itself. The common frequency and corresponding phase of the zero-sequence current of each outgoing line are solved by using the matrix beam algorithm. Sort the common frequencies from small to large and perform a phase group ratio to find the frequency so that the phase of each common frequency component of a certain outgoing line is always opposite to that of other lines or the common frequency components of all outgoing lines are always in the same phase until the next frequency No longer satisfied, this frequency is the upper band limit. The lower limit of the frequency band of the arc-suppression coil grounding system is 150Hz, and the lower limit of the frequency band of other indirect grounding systems is 0. This method is not affected by the operation mode of the distribution network and the imprecise line parameters.

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 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.

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.