36results about How to "Suitable for online applications" patented technology

The invention relates to an inner temperature estimation method for a single cell, which comprises an offline part and an online part. The offline part executes the steps of a1) acquiring the internal resistance characteristic of the single cell at different temperatures; and a2) acquiring a standard relationship between the inner temperature of the cell and the internal resistance of the cell according to the internal resistance characteristic. The online part executes the steps of b1) performing online detection on the current, end voltage and surface temperature of a current working cell; be) performing online estimation for the internal resistance of the current working cell according to the current and the end voltage; and b3) estimating the internal temperature of the current working cell according to the internal resistance acquired in the step b2), the surface temperature acquired in the step b1) and the standard relationship acquired in the step a2). Compared with the prior art, the inner temperature estimation method for the single cell has advantages of effective online estimation for the inner temperature of the single cell, simple operation, effective calculation amount reduction, etc.

The invention discloses a method for controlling a rolling mode of a pinch pass mill set so as to control 1# and 2# frames of the pinch pass mill. The method can realize the optimum control for specific elongation by choosing a proper rolling mode according to device parameters of a singe and double dual purpose pinch pass mill set and the technique parameters of belt materials, wherein the device parameters comprise a frame stiffness and ultimate tension and the technique parameters comprise the roughness of supplied material, the allowed scope for the roughness of the finished products, and the allowed scope for the specific elongation. The method can fully satisfy the customers in product mechanical property, surface quality, and the like, enhance the adaptability of the mill set to the products, lower the investment cost, exert the potential of the mill set and promote the use ratio of the device. The method of the invention is simple, clear and is suitable for on-line application.

The invention relates to a principal element degree of association sensor fault detection method and apparatus based on density clustering. The method comprises steps of: determining the operating condition data of monitoring sensors by using a unit multi-operating condition model and classifying the monitoring sensors to obtain an operating condition cluster, wherein the operating condition information of all monitoring sensors in the operating condition cluster forms a matrix X; forming a matrix K by using the operating condition information of any two monitoring sensors in the operating condition cluster; analyzing the principal element of the matrix K to obtain the major characteristic T of the matrix K; determining the degree of association of the any two monitoring sensors by using the normalized matrix X and the major characteristic T; and comparing the degree of association with a threshold value and detecting the fault of the monitoring sensor corresponding to the degree of association greater than the threshold value.

The invention relates to an online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis, which belongs to the technical field of wide-area dynamic monitoring and visualization of power systems. The method comprises the following steps: carrying out offline simulation analysis on the features of typical dynamic disturbance accidents in power grid, and selecting a wavelet function Psi and the decomposition layer-number I corresponding to the obtained maximum wavelet coefficient energy as online wavelet multi-resolution analysis tools; carrying out regionalization according to the PMU (power management unit) configuration situation of a target power grid, so that each region has one and only one PMU substation for measurement, and transmitting frequency signals measured by each PMU substation to a WAMS (wide area measurement system) master station; acquiring frequency signals of each PMU substation from the WAMS master station, and carrying out I-layer online wavelet multi-resolution analysis on the frequency signals by using the determined wavelet function so as to obtain wavelet coefficients of an I(th) layer; and discriminating disturbance occurrence time, disturbance occurrence potion and disturbance type according to the wavelet coefficients; and carrying out visualized display through taking a map as the background. The method disclosed by the invention can improve the running reliability of an electrical power grid.

The invention relates to a plate shape closed-loop control method of cold-rolled strip steel based on influencing self learning of a matrix. An influence matrix empirical value table with different plate belt materials and different passes is established by determining two key influence factors; and in the process of the plate shape closed-loop control, actually-measured plate shape data is utilized to improve the quality of the influence matrix empirical value table continuously by a self-learning mode, so as to lead the influence matrix empirical value table to be closer to the actual regulating efficiency of a plate shape regulating mechanism. As the self learning process is carried out under the condition of the practical coupling action of influence factors of the regulating performances of all regulating mechanism, the method is more comprehensive than the factors considered by the intelligent method in a sense. In addition, in the process of closed loop control, influences on calculation of the matrix and self learning of the matrix are realized by adopting a simple mathematical algorithm, the calculating speed is high, and the real-time performance is good. Therefore, the method has the advantages that the reliability is high, the adaptability is strong, online application is suitable, the implementation is convenient and the like.

The invention relates to an estimation method for a combustion state of a sub-cylinder of an internal combustion engine. The estimation method comprises the following steps: 1) arranging a cylinder pressure sensor in any sub-cylinder of the internal combustion engine; arranging a crankshaft rotating speed sensor on a crankshaft of the internal combustion engine; 2) solving an indicating torque sum of the sub-cylinders according to a rigidity model of an internal combustion engine crankshaft system; 3) resolving the indicating torque sum Ti <theta> so as to acquire the indicating torque of gas acting force of a current firing cylinder; 4) directly measuring the gas acting force indicating torque of the sub-cylinder provided with the cylinder pressure sensor during firing through the cylinder pressure sensor, evaluating difference of a measured value and the gas acting force indicating torque of the current firing cylinder acquired in step 3) so as to acquire error of the gas acting force indicating torque during the firing of the sub-cylinder provided with the cylinder pressure sensor, and using the error to correct an estimated value of the gas acting force indicating torque during the firing of the cylinder not provided with the cylinder pressure sensor. The estimation method provided by the invention can be widely applied to all kinds of electric control diesel engines and electric control gasoline engines.

The invention relates to an irregular coelonavigation sight line information extracting method, in particular to a small celestial body detection and navigation sight line information extracting method, and belongs to the field of small celestial body detection. The method mainly comprises the steps that 1, the edge contour of a small target celestial body in a navigation image is extracted; 2, a self-adaption method is used for removing false edge information; 3, the small celestial body edge contour obtained after the false edge information is removed is subjected to ellipse fitting; 4, the sight line information of the small target celestial body is extracted according to the ellipse fitting result. The influence of illumination, the camera shooting angle and spinning of the small target celestial body on the method is small, the precision and stability of small celestial body navigation sight line information extraction can be effectively improved, no precise shape model is needed, and the application range is wide. According to the self-adaption false edge removing method, the light and shade boundary of the small target celestial body and the false edge information caused by small celestial body surface terrain shading can be effectively removed, and the precision and reliability of ellipse fitting and sight line information extraction are guaranteed.

The invention relates to a rolling procedure making method of an aluminium single-stand cold-rolling machine, in rolling specification obtained by a rolling specification library according to the rolling material and specification, four system parameters are included to be suitable for the characteristics of rolling process of an aluminium single stand, and annealing, thickness, tensile force andspeed parameters in each pass can be respectively determined; the rolling specification is formed by a pass programming system, a thickness distribution system, a speed distribution system and a tensile distribution system, the specification of the rolling material carries out rolling procedure making by obtaining the rolling specification by the rolling specification library, so as to realize automatic generation of the rolling procedures of different materials with different width and thickness specifications in the production process of the aluminium single-stand cold-rolling machine and carry out rolling procedure making. The method has strong practicality, and can automatically realize rolling procedure making for different materials and specifications; the method is simple and practical, has high computing efficiency and rapid speed and is suitable for on-line usage.

The invention discloses a method for detecting power grid frequency by using an optimal multiplier Newton algorithm. The method is characterized by being capable of simultaneously detecting a peak value of power grid voltage, a power grid frequency, a direct current component and an initial phase angle. The calculation is accurate when the frequency is perturbed greatly, the algorithm is simple, the convergence speed is high, the anti-jamming capability is strong and the method is suitable for online application.

The invention discloses a hybrid power system energy management strategy based on reverse deep reinforcement learning. The strategy comprises the following steps of calculating a globally optimized SOC result as expert knowledge by using an optimization solution method; creating a reward neural network; learning the expert knowledge by utilizing reverse reinforcement learning to obtain parametersof the reward neural network; creating an action neural network, and evaluating the neural network; setting an SOC value before vehicle interaction; inputting the obtained SOC value before interactioninto a reward neural network to obtain a reward value; inputting the obtained pre-interaction SOC value into an action neural network to obtain a mode distribution ratio; interacting with the environment by using the mode distribution ratio to obtain an SOC value after interaction; inputting the SOC value before interaction, the mode distribution ratio, the reward value and the SOC value after interaction into an evaluation neural network to obtain an evaluation value; and calculating the gradient of each network and performing back propagation to update the network parameters by an intelligent agent till training is finished. The method is advantaged in that the optimal reward function can be learned from the expert knowledge, so the deep reinforcement learning effect is better.

The invention provides a short-circuit current limiting method based on power grid topological adjustment. The method includes the specific steps that 1, a potential strategy set is constructed; 2, candidate topological adjustment strategies are determined according to comprehensive effectiveness index values; 3, safety analysis is carried out on power grid short-circuit currents and the power grid operating state after the candidate topological adjustment strategies are executed; 4, transmission loss analysis is carried out on the power grid operating state, and a candidate topological adjustment strategy corresponding to the transmission loss minimum value is selected as a target topological adjustment strategy. Compared with the prior art, the short-circuit current limiting method based on the power grid topological adjustment has the advantages that the comprehensive effectiveness index values are adopted to objectively reflect limiting effects of the topological adjustment strategies on the whole network short-circuit currents, effective strategies can be quickly and accurately searched out of numerous potential strategies, safety assessment is conducted on the strategies, and operable topological adjustment strategies are determined.

The invention discloses a lithium ion battery stage of charge (SOC) mixed estimation method. The method comprises the following steps that step 1, whether a model-based method or an OCV-based method is adopted to estimate an SOC initial value is judged according to a comparison result of a battery placement time T and a standing time T2 of the battery, or SOC estimation is directly performed by adopting a coulomb counting method to obtain an SOC estimation value, and the SOC estimation time T0 is obtained simultaneously; and step 2, when the SOC estimation time T0 does not exceed the long drift time T1 of the battery, the estimation is ended; when the SOC estimation time T0 is larger than the long drift time T1 of the battery, the calibration of the SOC initial value is started, the SOC estimation is carried out again by adopting the coulomb counting method according to the calibrated SOC initial value, and a new SOC estimation value is obtained. By combining the coulomb counting method, the OCV-based method and the model-based method, the SOC can be rapidly and accurately estimated, so that the method is suitable for on-line SOC detection of the lithium ion battery, the accuracy of SOC estimation under different conditions is improved, and the service life of the battery is prolonged.

The invention discloses a low-voltage power distribution network cascading failure early warning method based on a risk assessment model, and the method comprises the steps: data collection and processing: collecting load data, weather data and fault data of a low-voltage power distribution network, and carrying out the data preprocessing of the collected data; fault feature selection: adopting an improved G-ReliefF algorithm to carry out optimal selection of fault features of the low-voltage power distribution network; performing cascading failure search: performing subsequent failure search according to the line outage model and the key line model, generating an accident chain and evaluating the accident chain; and fault early warning: calculating a risk assessment coefficient of the element and the line, determining a fault occurrence probability through the risk assessment coefficient, finally carrying out comprehensive risk assessment on the fault, and calculating a risk level. The method is used for predicting and mastering the safe operation state of the low-voltage power distribution network, discovering potential dangers and judging the fault development trend so as to improve the accuracy of fault early warning and further avoid large-area power failure.

The invention relates to an online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis, which belongs to the technical field of wide-area dynamic monitoring and visualization of power systems. The method comprises the following steps: carrying out offline simulation analysis on the features of typical dynamic disturbance accidents in power grid, and selecting a wavelet function Psi and the decomposition layer-number I corresponding to the obtained maximum wavelet coefficient energy as online wavelet multi-resolution analysis tools; carrying out regionalization according to the PMU (power management unit) configuration situation of a target power grid, so that each region has one and only one PMU substation for measurement, and transmitting frequency signals measured by each PMU substation to a WAMS (wide area measurement system) master station; acquiring frequency signals of each PMU substation from the WAMS master station, and carrying out I-layer online wavelet multi-resolution analysis on the frequency signals by using the determined wavelet function so as to obtain wavelet coefficients of an I(th) layer; and discriminating disturbance occurrence time, disturbance occurrence potion and disturbance type according to the wavelet coefficients; and carrying out visualized display through taking a map as the background. The method disclosed by the invention can improve the running reliability of an electrical power grid.

The invention discloses a fast emergency control method based on a depth feedforward neural network and a numerical integral sensitivity. In this method, a two-layer deep feedforward neural network isconstructed, which consists of classification neural network and fitting neural network. Transient stability performance indexes are extracted as input of neural network through short-time numericalintegration. Transient stability evaluation and numerical calculation of transient stability constraint function are carried out through deep feedforward neural network. Combined with numerical integration sensitivity, the gradient and sensitivity of transient stability constraint function with respect to emergency control variables are obtained. Finally, according to the sensitivity of each control variable, the optimal control variable optimization method is used to obtain the final emergency control strategy. The invention converts the numerical integration on the original system into neural network calculation for most of the time, which greatly reduces the calculation amount while retaining the calculation property of the original system transient stability constraint function.

The invention discloses a series battery pack short-circuit and low-capacity fault diagnosis method of fusing equalization information, a system and equipment, belongs to the field of circuit fault diagnosis, and aims to solve the problem that the influence of equalization in a circuit cannot be considered in the short-circuit fault and low-capacity fault diagnosis process in the prior art, and the circuit can not be applied to a battery system equipped with equalization control. According to the multi-fault diagnosis of the battery pack in the balanced state, fault detection is executed according to whether the battery pack meets the consistency requirement or not, and the fault detection realizes real-time detection and distinguishing of short-circuit and low-capacity faults and realizes fault quantification through analysis of balanced information under the driving working condition and the charging working condition. The problem that an existing fault diagnosis method related to short circuit or aging fails under balance is solved. The short-circuit and low-capacity fault cells in the battery pack are detected and distinguished by using the equalization process information, so that the fault diagnosis calculation load is effectively reduced, and the actual battery management system application is facilitated.

The invention belongs to the technical field of the reactive voltage control over a power grid and more particularly relates to a reactive voltage verification method based on a limit operation mode. According to the method, firstly, through reading the data information of the power grid, four operation modes are formed, and then a limit operation mode is selected based on the calculation result of a comparison voltage. Secondly, a substation of the worst voltage exceeding condition is selected, and whether the two-side / three-side voltage of a substation transformer exceeds a voltage upper limit Umax or a voltage lower limit Umin or not is examined. Thirdly, a compensation factor epsilon is set and the amount of reactive power compensation QC / QL of the substation is calculated. Fourthly, whether the sum of the amount of reactive power compensation QC / QL and the actual input QCr / QLr of the reactive power compensation exceeds a pre-configured capacity QCmax / QLmax of the reactive power compensation or not is judged. Fifthly, the voltage is re-calculated based on the above adjustment. The above process is circularly conducted till no voltage exceeds the upper / lower limit. According to the invention, based on the calculation of limit operation modes, whether the configuration status of reactive power compensation equipment meets the requirements of the relevant provisions and the requirement of voltage adjustment or not can be effectively verified, so that the decision-making process of the power grid operation is guided. Meanwhile, the blank in reactive voltage checking method is filled, and the above method is more applicable to the actual operation status of the power grid. Therefore, the method is suitable for online application.

The present invention relates to a method and device for detecting faults of principal component correlation degree sensors based on density clustering, wherein the method includes: judging the working condition data of the monitoring sensors by using the multi-working condition model of the unit, classifying the monitoring sensors, and obtaining the working conditions Condition cluster; Wherein, the working condition information of all monitoring sensors in the described working condition cluster constitutes matrix X; Utilize the working condition information of any two monitoring sensors in the described working condition cluster to form matrix K; Carry out principal component analysis to matrix K, obtain The main characteristic T of matrix K; Utilize the matrix X and main characteristic T after the normalization process to determine the degree of correlation of any two monitoring sensors; The degree of correlation is compared with a threshold, and the monitoring corresponding to the degree of correlation greater than the threshold The sensor performs fault detection.

The invention discloses a short-circuit and low-capacity fault diagnosis method, system and equipment of a series battery group that integrates balance information, and belongs to the field of circuit fault diagnosis, aiming at solving the problem that the short-circuit fault and low-capacity fault diagnosis process in the prior art cannot be considered in the circuit The effect of equalization cannot be applied to the flawed technical problem in battery systems equipped with equalization control. Multi-fault diagnosis of the battery pack in the balanced state performs fault detection according to whether the battery pack meets the consistency requirements. Fault detection realizes real-time detection and monitoring of short-circuit and low-capacity faults by analyzing the balance information under driving conditions and charging conditions. Distinguish and realize fault quantification, which solves the problem that the existing short circuit or aging-related fault diagnosis methods fail under equalization. Using the equalization process information to detect and distinguish short-circuit and low-capacity faulty cells in the battery pack, effectively reducing the calculation load of fault diagnosis and facilitating the application of the actual battery management system.

The invention provides a skip reentry aerial vehicle online trajectory planning guidance method based on a linear pseudo spectrum. The method comprises the following steps of initializing, performingstandard control on a flight segment, performing skip segment tilting counter-rotating determining, performing skip segment predictive trajectory integrating, performing precision determining, correcting skip segment rolling counter-rotating time correction, re-establishing parameter control, performing skip segment predictive trajectory integrating, performing precision determining, performing skip segment control parameter correction, and performing Kepler trajectory flight. According to the skip reentry aerial vehicle online trajectory planning guidance method, a roll angle modulus is updated through iteration and furthermore a terminal range deviation is corrected. When a segmentation condition is not decided by time, control compensation is introduced, thereby supplying a good initialcondition for terminal guidance. Furthermore a roll angle modulus value control rule and roll angle counter-rotating time are synchronously updated in one guidance period. Furthermore terminal transverse range and longitudinal range precision are simultaneously ensured. Through an analysis relation between a control amount correction value and a terminal offset, no iterative integration is required in updating the control amount at each time. Only 2ms are required in calculation at each time. The skip reentry aerial vehicle online trajectory planning guidance method is particularly suitable for online application.

The invention provides a short-circuit current limiting method based on power grid topological adjustment. The method includes the specific steps that 1, a potential strategy set is constructed; 2, candidate topological adjustment strategies are determined according to comprehensive effectiveness index values; 3, safety analysis is carried out on power grid short-circuit currents and the power grid operating state after the candidate topological adjustment strategies are executed; 4, transmission loss analysis is carried out on the power grid operating state, and a candidate topological adjustment strategy corresponding to the transmission loss minimum value is selected as a target topological adjustment strategy. Compared with the prior art, the short-circuit current limiting method based on the power grid topological adjustment has the advantages that the comprehensive effectiveness index values are adopted to objectively reflect limiting effects of the topological adjustment strategies on the whole network short-circuit currents, effective strategies can be quickly and accurately searched out of numerous potential strategies, safety assessment is conducted on the strategies, and operable topological adjustment strategies are determined.

The invention belongs to the technical field of reactive voltage control of a power grid, in particular relates to a layered and zoned reactive voltage analysis method based on a boundary condition. The layered and zoned reactive voltage analysis method comprises the following steps of making the power grid layered and zoned; determining a researched zone and a boundary thereof; inputting maximum daily load, minimum daily load, output of a power generator, the boundary condition, a reactive compensation configuration condition and a limit value of a regional power grid; carrying out power flow calculation, adjusting reactive compensation capacity, and adjusting the boundary of the regional power grid to the boundary condition; judging whether an out-of-limit situation exists in the voltage in a region or not; and judging whether a power factor of each main transformer conforms to the stipulation of the limit value or not. According to the layered and zoned reactive voltage analysis method, reactive voltage correction and reactive voltage optimization can be fulfilled, the reactive voltage analysis efficiency of a large-sized power grid can be substantially improved, focused analysis can be conducted with regard to a local power grid, and the layered and zoned reactive voltage analysis method is suitably used for situations with relatively complete data of the local power grid and insufficient data of a large power grid; and the layered and zoned reactive voltage analysis method is easy to understand and implement, is proximate to actual running of the power grid, and is suitably for on-line application.