7 results about "Stability result" patented technology

The invention discloses a structural stability monitoring method for clamping for maintenance, and relates to the technical field of clamping tools, the method comprises the following steps: carrying out key part analysis on structural characteristic information to obtain a key part set of a clamping device; performing stability index extraction based on the maintenance operation clamping demand information to obtain a clamping structure stability index set; obtaining a key part structure stability index set; acquiring a clamping device sensor monitoring module set; acquiring a clamping device sensor monitoring module set; and performing integrated evaluation on the key part stability evaluation parameter set, and determining a stability result of the clamping structure for maintenance. The technical problems that due to the fact that data of key parts of an existing clamping device for maintenance cannot be collected in real time, the structural stability of clamping is difficult to accurately and objectively assess, and potential safety hazard discovery and processing are lagged are solved, and the technical effect of improving the structural stability assessment real-time performance and the clamping device safety is achieved.

The present invention discloses a state-dependent H∞ control method for a two-dimensional switching continuous discrete system, comprising the following steps: obtaining a two-dimensional switching continuous discrete system model; constructing a state-dependent switching law that depends only on continuous variables to obtain a stability condition for the two-dimensional switching continuous discrete system; applying the stability condition for the two-dimensional switching continuous discrete system to a switching repetitive process to determine an along-channel stability condition for the two-dimensional switching continuous discrete system; and designing a state feedback control law that considers H∞ control of the switching repetitive process, so that the two-dimensional switching continuous discrete system has the desired H∞ performance. The method of the present invention relies only on the state-dependent switching law of continuous variables to analyze the stability of the two-dimensional switching continuous discrete system, obtains the stability condition using the Lyapunov function method, applies the stability result to the switching repetitive process, and implements H∞ control of the switching repetitive process by establishing a new state-dependent switching law.

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 discloses a two-dimensional switching continuous discrete system H-infinity control method based on state dependence. The method comprises the following steps: acquiring a two-dimensional switching continuous discrete system model; constructing a state dependence switching law which only depends on continuous variables, and obtaining stability conditions of the two-dimensional switching continuous discrete system; applying the stability condition of the two-dimensional switching continuous discrete system to a switching repetition process, and determining an along-channel stability condition of the two-dimensional switching continuous discrete system; and designing a state feedback control law, and considering H-infinity control in a switching repetition process, so that the two-dimensional switching continuous discrete system has expected H-infinity performance. According to the method, the stability of the two-dimensional switching continuous discrete system is analyzed only by depending on a state dependence switching law of continuous variables, a stability condition is obtained by utilizing a Lyapunov function method, a stability result is applied to a switching repetition process, and H-infinity control of the switching repetition process is realized by establishing a new state dependence switching law.

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.