89 results about "Grid generator" patented technology

The present invention provides a continuously tunable external cavity laser (ECL) with a compact form factor and precise tuning to a selected center wavelength of a selected wavelength grid. The ECL may thus be utilized in telecom applications to generate the center wavelengths for any channel on the ITU or other optical grid. The ECL does not require a closed loop feedback. A novel tuning mechanism is disclosed which provides for electrical or mechanical tuning to a known position or electrical parameter, e.g., voltage, current or capacitance, with the required precision in the selected center wavelength arising as a result of a novel arrangement of a grid generator and a channel selector. The grid generator exhibits first pass bands which correspond to the spacing between individual channels of the selected wavelength grid and a finesse which suppresses side band modes of the laser. The channel selector exhibits second pass bands that are wider than the first pass bands. In an embodiment of the invention the second pass bands have a periodicity substantially corresponding with the separation between the shortest wavelength channel and the longest wavelength channel of the selected wavelength grid and a finesse which suppresses channels adjacent to the selected channel. The broad second pass bands of the channel selector reduce the sensitivity of the ECL to tuning variations about the selected channel, thus avoiding the requirement of a closed loop feedback system to control the channel selector.

The invention discloses a character recognition method based on deep learning. The method includes the construction phase of a spatial transform layer and the construction and training phase of a deep convolutional neural network. The spatial transform layer consists of three parts: a positioning network receives a feature map as an input, enables the feature map to pass through a series of hidden layers, and then outputs a parameter of spatial transform, wherein the parameter is to be used for the feature map; a grid generator generates sampling grids by using the parameter generated in the first part; and a sampler takes the feature map and the sampling grids as inputs, samples the feature map at grid points, and finally obtains an output feature map result. The spatial transform layer can be differentiated. By the spatial transform layer, image data can be spatially processed in the network so that the network can learn the invariance of the space distortion and avoid the need for manually generating a large number of deformed samples in traditional convolutional network training. In addition, by building deeper volumes and neural networks, a better recognition effect is realized on a large variety of Chinese characters.

The invention provides a steam turbine and a speed regulating system model parameter correcting method thereof. The method includes that a steam turbine of a power grid generator set and a speed regulating system model of the steam turbine are established, and a generator set side signal is input; and whether output data of the steam turbine and the speed regulating system model of the steam turbine exceed an error threshold value or not is verified under the disturbance working condition, if the output data exceed the error threshold value, at least one correcting operation among dynamic droop correction, regenerative system correction and non-linear characteristic correction is performed, and the corrected steam turbine and the speed regulating system model of the steam turbine are generated. According to the steam turbine and the speed regulating system model parameter correcting method thereof, a transition process between normal operation conditions and accident conditions can be simulated, and a model which is well matched with actual data result and provided with robustness can be obtained.

The invention discloses a Matlab-based model recognition method for importing from Midas to Flac3D. The method includes the following steps that a three-dimensional simulation model is established with Midas/GTS software, grid partition of the model is carried out through a grid partition module of the Midas/GTS software, free grids and mapping grids are generated through a tetrahedral grid generator and a hybrid grid generator, and coupling of grid nodes of different parts is achieved; different material attributes are given to different parts of the grids; conversion of model information text files of Midas is achieved with Matlab software; the text files are output as importable files, with the extensions of .Flac3d and .dat, of Flac, an external grid input interface is found in a file menu of Flac, the text files are imported into Flac according to the path, and all groups of grids are displayed. By means of the method, error-free connection between Midas software and Flac3D software can be achieved.

The invention relates to a protection method for safe operation of a power grid, in particular to a fast switchback protection method for a generating set in a local power grid. A fast switch-back protection method for a generator set in a local power grid, which is an instruction to trigger a fast switch-back protection action of a generator set in a local power grid when the following four conditions are met simultaneously under the safe operation condition of the generator set in the local power grid : (1) The permission condition for fast switching back of the generator set in the local power grid exists; (2) The main fuel cutoff of the boiler does not occur; (3) The load of the generator in the local power grid is greater than 30%; (4) The main transformer outlet of the generator in the local power grid Switch tripped. The invention perfects the protection of the generator set in the special system in the local grid, and can run in isolation with the local grid under the condition of ensuring the safety of the generator set of the local grid. So as to meet the production continuity requirements of special industries such as metallurgy and petrochemical, and ensure the safety of personal and core equipment.

The invention discloses a mixed integer convex programming method for optimal power distribution of AC/DC parallel transmission channels, based on the active power generation dispatching plan of the whole grid generator set and the active power transmission plan of the DC transmission line, by means of processing methods of cone relaxation transformation and large M method equivalence, the objective function and constraint conditions with high nonlinearity are subjected to convexification processing, the established optimization model is transformed into a mixed integer convex programming model which is easy to solve, the obtained optimal power allocation scheme of AC/DC transmission channel can effectively reduce the loss of AC and DC transmission channels, obvious economic benefits are achieved, and the mathematical optimization of the solution is ensured, and the solving efficiency of optimization calculation is improved, so as to achieve the operation economy of AC/DC interconnected power network.

The invention relates to a road ground three-dimensional feature collection method and device based on a laser grid. The device includes a housing; two cameras, a laser grid generator and a central control processing system are arranged in the shell; the two cameras are symmetrically arranged at the positions, on the left side and the right side of the laser grid generator, of the shell, the lasergrid generator is parallel to the optical axes of the two cameras, the laser grid generator and the binocular camera are both controlled by the central control module, and image signals of the cameras are transmitted to the central control processing module through link communication. the topographic features of the ground are obtained in real time by adopting a method of combining stereoscopic vision and laser grid projection, real-time data are provided for path planning and decision making in automatic driving or auxiliary driving, dangers such as road pits and obstacles are avoided in time, and the driving safety is greatly improved.

A sensor system having multiple sensors and having a grid generator projecting into space a relative navigation grid and a method of utilizing multiple airborne sensors operably coupled to an aircraft and coordinating the sensor outputs from the airborne sensors based on the determined spatial position of the multiple sensors and a method for utilizing multiple airborne sensors.

The invention relates to an electric vehicle charging optimization scheduling method considering transmission and distribution cooperation and containing reactive voltage constraints. According to themethod, a unit combination with the optimal cost is obtained by adopting a particle swarm algorithm improved on the basis of bacterium chemotaxis for a power transmission network model, and the solving efficiency of the model is improved by increasing direct-current power flow constraints; the power transmission network generator set model is divided into main and sub problems for iterative solution through Benders decomposition, and the solution efficiency of the model is further improved; photovoltaic unit power generation is used for cooperative scheduling, and the system operation efficiency is guaranteed; and on the premise that a distribution network layer considers security constraints, a node preprocessing strategy is adopted, a solution space range is reduced, and the overall solution efficiency is improved.

A system and method for radio network planning comprises a grid generator and a Monte Carlo analysis module. The Monte Carlo analysis module comprises a snapshot generation module which draws, for each snapshot and for each pixel, a statistical realisation from a distribution function relating to slow fading, and a snapshot evaluation module which establishes radio network parameters. The Monte Carlo analysis module further comprises a sub-snapshot generation module which generates at least one sub-snapshot for each evaluated snapshot result, and a sub-snapshot evaluation module (14) for evaluating HSDPA performance parameters based on the sub-snapshot. The sub-snapshot evaluation module (14) comprises a scheduler module (16) which is arranged for scheduling a HSDPA user according to a scheduling scheme.

The invention discloses a method and a system for adjusting difference adjustment coefficient of a direct current-containing power grid generator, and belongs to the technical field of electric powersystem operation control. The method comprises the following steps: constructing a target function in the adjusting process of the difference adjustment coefficient, that is, the voltage standard difference index of central nodes under multiple periods in a regional power grid is minimal; constructing the constraint conditions in the adjusting process of the difference adjustment coefficient, wherein the constraint conditions comprise trend constraint, control variable constraint and security constraint, and the trend constrain equation contains an electric generator node, an alternating current PQ node and a direct current PQ node; and solving the target function by a particle swarm algorithm, and finding a group of difference adjustment coefficient which enables the target function to obtain the minimum value when the constraint conditions are met, namely an electric generator difference adjustment coefficient adjusting value. By the method and the system, the difference adjustment coefficient of the electric generator in the regional power grid can be optimized rapidly and efficiently and the voltage level of the power grid is improved.

The invention discloses an excitation control system applicable to a steam turbine generator unit of a self-generation power plant. The excitation control system comprises a signal collection unit used for obtaining an external power power-supplying fluctuation signal between the self-generation power plant and an external power grid and/or an internal grid power-supplying fluctuation signal of asteam turbine generator, a signal processing unit used for obtaining a current external power power-supplying fluctuation parameter and/or an internal grid generator power-supplying fluctuation parameter, a load control unit used for controlling the operating state of a power load, an output control unit used for regulating the output power of a backup steam turbine generator, and a call wire power factor control unit used for realizing real-time control of a call wire power factor. The invention also discloses an excitation control method applicable to the steam turbine generator unit of theself-generation power plant. By virtue of the technical scheme, fluctuation of output power of the internal power grid of a sugar refinery in isolated grid or grid-connected operation can be lowered,so that switching of two kinds of operating modes of steam constant current and constant power grid connection is realized, and operation of the sugar refinery can be more energy-saving and economical.