4 results about "Stability result" patented technology

The application discloses a kind of stability determination method of power system and unified power quality conditioner.Therein, the method includes: in power system, after injecting disturbance current corresponding to predetermined disturbance frequency to point of common coupling, obtaining point of common coupling voltage signal, grid-side current signal and load-side current signal;Determine the source impedance of grid-side and the load impedance of load-side;According to source impedance and load impedance, determine the return rate matrix;According to return rate matrix, determine the first eigenvalue and the second eigenvalue;Determine the first Nyquist curve corresponding to the first eigenvalue, and the second Nyquist curve corresponding to the second eigenvalue;According to Nyquist curve, determine the stability result of power system at predetermined disturbance frequency.The application solves the technical problem that there is strong limitation when determining whether power system is stable in related technology, and it is difficult to accurately evaluate the true stability degree.

The invention relates to a stability evaluation method and device of a power system, computer equipment, a computer readable storage medium and a computer program product. Comprising the following steps: for any iteration training, acquiring data from a stability data set of a power system, and performing feature extraction on steady-state operation data, fault process data and power grid topology data to obtain fusion latent variable features; inputting the fused latent variable features into a stability evaluation network to obtain a stability result and a margin result; determining stability loss and margin loss based on the stability result, the stability true value, the margin result and the margin true value; determining a stability weight and a margin weight; based on the stability loss, the margin loss, the KL divergence regular term, the stability weight and the margin weight, determining the total loss of the model, further judging whether a preset condition is met or not, and if not, continuing iterative training; if yes, the training is completed. According to the method, stability prediction and margin prediction can be collaboratively optimized.

The application belongs to the technical field of stability evaluation of rescue well positioning results. The application provides a method for evaluating the stability of rescue well positioning results based on the Rayleigh criterion. In the case that the distance positioning result obtained by the optimization algorithm in the accident well positioning algorithm using the improved Bezier model has singular values, resulting in low accuracy of data stability evaluation, the singular values of the distance positioning result obtained by the optimization algorithm are removed by using the Rayleigh criterion, and then the stability of the removed data set is evaluated. This method can to some extent judge the wrong optimal result and remove it, making the optimization result data more reasonable. The method has small implementation size and high implementation effect, does not need human secondary judgment on the result data, and improves the speed of processing the results of part of the optimization algorithm. The method combines relevant statistical physical quantities to analyze the stability of the processed data, and the stability result is intuitive and accurate.

The present application relates to the field of rock mass mechanics test and engineering stability analysis, and discloses a method for controlling the stability of surrounding rock of a withdrawal channel based on plastic zone butterfly expansion theory, which collects stress data, strength data and section data of the surrounding rock of the withdrawal channel to identify the plastic zone state and its expansion form of the surrounding rock, and determines the basic roof fracture state in combination with the basic roof fracture line, the stop mining line, the withdrawal channel and the working face advancing position data; determines the completion time of the roof cutting operation according to the working face advancing position data and the movement law of the mining high stress zone, and determines the hydraulic fracturing roof cutting parameters in combination with the plastic zone state and the basic roof fracture state; implements the roof cutting according to the parameters and records the construction process data; collects the mine pressure deformation data and checks the surrounding rock stability result in combination with the construction process data. The present application realizes the control effect of blocking the load evolution of the withdrawal channel from the stress environment and the roof structure in two directions, guarantees the safe withdrawal and effectively reduces the deformation of the surrounding rock of the roadway.