36results about How to "Simplify calculation difficulty" patented technology

The invention relates to the technical field of power batteries of an electric car, and provides a pre-estimate method for the SOH (state of health) of a power battery of the electric car. The method comprises the steps: employing a Rint battery model and a dual-expansion Kalman filtering (Dual-EKF) to estimate the internal resistance of the battery in advance, and calculating the SOH through the internal resistance of the battery. The method is high in rate of convergence, is accurate in estimation, solves the problem that a conventional pre-estimate method for the SOH of the power battery of the electric car cannot accurately achieve real-time estimation, irons out the defects that the conventional pre-estimate method is not steady in discreet value at the initial stage of pre-estimate and calculation and is liable to cause oscillation, and is convenient for the real-time pre-estimate of the SOH of the power battery.

A satellite-borne passive radar location method based on a GNSS-R (global navigation satellite system-reflection) signal geometrical relationship comprises steps as follows: step one, the moment when a receiver receives a direct signal of a GPS satellite is marked as t1, and the moment when the receiver receives a reflected signal to a target by a related GPRS satellite signal is marked as t2; step two, a direct path length L and a reflection path length D of the signal are calculated according to the arrival moment of the signal; step three, the position coordinate T ( xt, yt, zt) and the position coordinate R (xr, yr, zr) of a transmitter and the receiver are calculated; step four, the included angle alpha between the direct signal and the reflected signal is calculated, and the vector of the reflected signal is determined; step five, the vector of the reflected signal is lengthened to the point N in the transmission direction, so that the distance between R of the receiver and the point N is equal to the distance of the reflected signal path, and a coordinate of N is calculated; step six, a midpoint of a vector TN from T of the transmitter to the point N is set to be M, and a coordinate of M is calculated; and step seven, a TN vertical line passing the point M is drawn on a plane TRN, the vertical line intersects with a vector RN at the point P which is the position of the target at the moment, and a coordinate of the point P is calculated. According to the method, the calculation difficulty is reduced, the location efficiency is improved, and the location cost is reduced.

The invention provides a multi-objective double-layer optimal configuration method of a microgrid power supply. The multi-objective double-layer optimal configuration method comprises the following steps: establishing a microgrid distributed generation and hybrid energy storage system model; establishing a comprehensive optimization configuration multi-objective index system including the annual cost of microgrid investment operation and maintenance, microgrid load p power shortage probability, microgrid wind and light rejection rate and system net load power fluctuation rate; establishing multi-objective double-layer optimal configuration models including an upper-layer optimal configuration model and a lower-layer optimal configuration model; respectively solving the upper-layer optimized configuration model and the lower-layer optimized configuration model to obtain an optimized microgrid power supply configuration scheme. When the micro-grid configuration containing the hybrid energy storage is considered, the unification of economy, reliability and environmental protection is fully considered, the model is decoupled and simplified on the basis of multiple time scales, the calculation difficulty is simplified, the defects of the current hybrid micro-grid optimal configuration are overcome, and the technical problem is solved that a traditional optimization method cannot comprehensively consider a hybrid energy storage system.

The invention relates to the technical field of automobile control and particularly relates to a differential pressure pipeline icing delayed diagnostic method for a gasoline engine particulate filter. A differential pressure value is monitored, the environment temperature Th, the exhaust temperature Tp, the parting duration and the starting duration data are collected at the same time and compared with a T1-t1 two-dimensional table and/or T2-t2 two-dimensional table and/or a T3-t3 two-dimensional table, and whether a differential pressure pipeline of a vehicle is iced or not is judged; when the practically-measured differential pressure value exceeds a given upper limit value or a given lower limit value and if it is judged that the differential pressure pipeline is iced, fault alarming of a differential pressure sensor is delayed; if it is judged that the differential pressure pipeline is not iced, fault alarming of the differential pressure sensor is carried out immediately; and thevehicle can judge the icing condition of the differential pressure pipeline icing at different parking environment temperatures according to practical environment conditions so as to avoid error diagnosis to the differential pressure sensor when the differential pressure pipeline is blocked.

The invention relates to the technical field of power data cleaning, in particular to a power missing data filling method based on a hybrid strategy. The method comprises the steps that S1, an improved k-Means clustering algorithm is adopted to perform clustering on a dataset containing missing data; S2, an RBF neural network is improved and constructed according to the clustering result; and S3,the RBF neural network is trained, and filling checking is performed on the missing data. Through the method, clustering of the dataset with missing properties is well realized, and the RBF neural network is designed in combination with the clustering result to perform prediction filling on missing values. Besides, the filling precision of the missing data is improved, implementation is easy and convenient, calculation expenditure is appropriate, and the method has high practical value against the problem that a large amount of data generated in the operation and maintenance process of a powersystem is missed and damaged due to the influences of physical factors, software factors and other factors.

The invention belongs to the field of instrument measurement and particularly relates to a sweep generator based on digital zero intermediate frequency. In the sweep generator, a sweep frequency source has three paths of outputs; the first path is connected with one end of a to-be-tested network; the second path is respectively connected with two analog multipliers; the third path is only connected with the second analog multiplier; the other end of the to-be-tested network is connected with the first analog multiplier; output ports of the two analog multipliers are respectively connected with input ports of two analog filters; output ports of the two analog filters are respectively connected with input ports of two paths of digital analog converters; output ports of the two paths of digital analog converters are connected with different ports of a digital signal processing module; the digital signal processing module is used for realizing the digital zero intermediate frequency orthogonalization, phase difference and amplitude ratio calculation for the output signals of the two paths of digital analog converters and outputting the result. According to the sweep generator, the design difficulty of the simulating sweep frequency source is reduced, the influence caused by the quantization error of the digital device is reduced, the software calculation difficulty is reduced and the measurement precision is improved.

The invention relates to a micro-grid line protection method, in particular to a micro-grid line protection algorithm based on disturbance voltage. The method comprises the following steps that (1) a standard voltage transformer is used for detecting three-phase terminal voltage; (2) alternating voltage is converted into direct current through the Park transformation; (3) the direct current and a reference signal (Uqref) are compared to obtain the disturbance voltage (Ve); (4) according to the micro-grid disturbance voltage, a trip instruction is sent in a delayed mode. According to the micro-grid line protection algorithm, the micro-grid operation characteristics are fully considered, the micro-grid protection action reliability is improved, and the micro-grid line protection algorithm has good prospects.

The invention provides a probability evaluation method for the power adjustable capability of a virtual power plant, and belongs to the technical field of power system operation and control. The method comprises the steps of performing decoupling linear approximation on a power flow model of a virtual power plant, and constructing a power flow equation in a matrix form; performing linearization processing on active-reactive power ranges output by various types of power generation equipment and energy storage equipment; constructing a Gaussian mixture model to perform probability distribution function fitting on uncertain factors such as photovoltaics, fans and loads; solving a power adjustable range of the virtual power plant at the grid-connected point under equal confidence by utilizingan opportunity constraint method; and in the active-reactive two-dimensional plane, calculating a scalar field function of the adjustable range and the confidence coefficient to obtain the virtual power plant power adjustable capability under different confidence coefficients. According to the method, the influence of uncertain factors on the power adjustable capability of the virtual power plantis fully considered, the calculation speed is effectively improved, a more accurate evaluation result can be obtained, and optimal scheduling of a power system is promoted.

The invention discloses a method and system for determining the maximum proportion of new energy of a power system, and belongs to the technical field of power system operation control. The method comprises the following steps: establishing a stand-alone system model according to a new energy power system; determining relational expressions of injection power of the new energy generator single-machine model to the bus, injection electromagnetic power of the synchronous generator single-machine model to the bus, load absorption electromagnetic power of the power system and a new energy proportion; determining unbalanced power which can be balanced by the new energy generator single-machine model; adjusting power of balanced and unbalanced power needing to be provided by the synchronous generator single-machine model is determined; and determining the new energy proportion of the energy power system. The method can simplify the analysis and calculation difficulty while guaranteeing the accuracy of a calculation result, is higher in engineering applicability, and can effectively guarantee the safe and stable operation of a power grid.

The invention provides a sound source orientation method, device and system, and relates to the technical field of sound signal processing. The method comprises the steps of acquiring the time delay estimation of each group of microphones of M groups of microphones, wherein M is larger than or equal to 2, m is larger than or equal to 1 and smaller than or equal to M, and each group of microphonescomprises two microphones; respectively calculating a relative horizontal angle of a sound source relative to each group of microphones according to the time delay estimation of each group of microphones, performing coordinate transformation on the relative horizontal angle of each group of microphones, and transforming the relative horizontal angle to a preset coordinate system to obtain a coordinate transformation horizontal angle phi m; and calculating an estimated horizontal angle according to the transformation horizontal angle phi m and the time delay estimation and a first formula.

The invention discloses a logistics material prediction method based on a gray model, and relates to the technical field of material demand prediction, and the technical scheme is characterized in that the logistics material prediction method specifically comprises the following steps: S1, building a logistics material consumption prediction model; S2, performing self-correction on the material consumption prediction model established in the step S1, and correcting parameters of the material consumption prediction model when the fitness of the material consumption prediction model is lower than a threshold value; and S3, according to the step S1 and the step S2, establishing a multi-stage material consumption prediction and early warning system and a synchronization mechanism. According tothe method, the idea of piecewise linearization is adopted, local linearization processing is carried out according to the consumption speeds of different types of logistics materials in different stages, and meanwhile, a plurality of linearization models are adopted in the whole process to approach the nonlinear process, so that the calculation difficulty of the material consumption prediction problem can be greatly simplified, and the material consumption prediction accuracy can be improved.

The invention discloses a method for compensating a high-frequency motion error of an unmanned aerial vehicle-mounted bistatic synthetic aperture radar (SAR), and the method comprises the steps: constructing a high-frequency motion error model of an unmanned aerial vehicle-mounted bistatic SAR system, and determining the amplitude and initial phase spatial-variant properties and spatial-variant gradient directions of the high-frequency motion error model; then, using a traditional parameter estimation method to estimate amplitude and initial phase information of a high signal-to-noise ratio region in a whole scene, projecting the amplitude and initial phase information to a space-variant gradient direction, and using a fitting method to obtain amplitude and initial phase information of all positions in the space-variant gradient direction; and performing sub-scene division on the whole scene, and performing high-frequency motion error compensation on each sub-scene so as to realize high-frequency motion error compensation of the whole scene. According to the method, the projection and fitting modes are adopted, only the amplitude and initial phase information of the high-frequency motion error of the high-signal-to-noise-ratio area need to be estimated, the calculation amount is reduced, the operation efficiency is improved, the sub-scene division mode is adopted, and the compensation efficiency and precision are improved compared with the mode that motion error compensation is directly conducted on the whole scene.

The invention relates to a method for calibrating a parabolic catadioptric camera through the imaging of a straight line, and the method is characterized in that the method employs the geometric relation between the projection of the straight line on a unit virtual globe in a unit virtual globe imaging model and the position of a mirror surface contour on the virtual globe. The method specificallycomprises the following steps: extracting a line image from an image and the pixel coordinates of image points on the mirror surface contour; carrying out the fitting of the image of the mirror surface contour according to the pixel coordinates of image points on the mirror surface contour, and solving an initial value of the internal parameters of the parabolic catadioptric camera; secondly solving antipodal image points corresponding to the line image and the pixel coordinates of image points on the mirror surface contour, i.e., the images of two end points on one diameter of the unit virtual globe; solving a vanishing point in an orthogonal direction through the attributes between the antipodal image points of the line image and the mirror surface contour, and solving the internal parameters of the parabolic catadioptric camera.