164 results about "Compensation point" patented technology

The invention provides a mura compensation module and a method, a display device and a method, which belongs to the technical field of mura compensation and aims at solving the problems of a large amount of data required to be stored and a large amount of computation by the existing mura compensation technology. The mura compensation module comprises an acquisition unit, a storage unit, a judging unit and a compensation unit, wherein the acquisition unit is used for acquiring display data and a position address of a pixel; the storage unit stores a compensation list, the compensation list comprises compensation points and corresponding compensation values, pixels corresponding to the compensation points are sampling pixels, and the sampling pixels are partial pixels in a display panel and comprise all pixels having mura; the judging unit is used for judging whether the pixels are the sampling pixels; and the compensation unit is used for compensating the display data of the sampling pixels according to the compensation values of the compensation points corresponding to the sampling pixels.

The invention provides an image bad point detecting method, comprising: performing the buffer memory on at least three continuous images including an origin image, at least a former image and at least a latter image; determining the pixel point in the origin image respectively relative to the forward motion vector of the former image and the backward motion vector of the latter image; determining the pixel point in the origin image respectively relative to the forward motion compensation point of the former image and relative to the backward motion compensation point of the latter image; performing the bad point detection on the pixel point in the origin image according to the forward motion compensation point and the backward motion compensation point. The method considers the characteristic of the image gray scale and the motion vector on the time and the space, obtains the motion compensation point in the former image and the latter image corresponding to the pixel in the origin image according to the motion vector, thereby increasing the detection precision of the bad point or the bad ring, improving the reparative accuracy of the bad point or the bad ring in the image.

The invention discloses a power distribution network reactive power optimization system and method based on multi-data analysis. The system comprises: a distribution network data acquisition device for acquiring 10kV line outlet node real-time data and transmitting the same to a host computer control system; a dynamic reactive power compensation device for uploading distribution network operating data and reactive power compensation device running status data to the host computer control system by using GPRS. The method, through the EMS and distribution network automation system, get access to the data of each node of a 10kV line, carries on the load flow calculation, obtains the distribution of the voltage, active power and reactive power of each node of the line, and makes the line run in an optimal state through reactive power strategy control, develop reactive power optimization strategy through a genetic algorithm to determine the compensation point, compensation capacity and the like, controls the reactive power compensation equipment in the distribution network to achieve full distribution network reactive power optimization operation control.

The invention discloses an in-process evaluation based complex spatial surface error feedback compensating method. The method comprises the following steps of processing a complex surface cutting force module through a ball-end cutter, performing dynamic compensation for a target cutter location point for workpiece pre-processing; performing in-process detection for the pre-processed workpiece to obtain geometrical information of an actual contour; evaluating error for the pre-processed workpiece through a contour degree error evaluation model; when the contour error is greater than tolerance, determining a compensation point position U1 corresponding to each contact point; guiding the compensation point position corresponding to each contact point to three-dimensional CAD (Computer-Aided Design) to obtain a compensating process contour to generate a compensating processing tool track; and performing static compensation and processing for the pre-processed workpiece and finishing the flow. Under the premise of ensuring the processing precision of part surface, the processing precision of the part is detected in process without investing fund to purchase more detection devices, so that the conveying and loading time of workpieces is shortened.

A camera and method usable for capturing images of scenes illuminated by ambient light. The camera has a body and an electronic imager disposed in the body. The electronic imager captures an ambient light image as a multicolored electronic image. A color detector assesses the ambient light to provide a color value. A white balancing circuit determines a white balance color space vector defining a white balancing of the electronic image from the color value to a white point for a predetermined designated illuminant. A reversal circuit determines a reverse color space vector originating at the color value and extending opposite the white balance color space vector. A color balance adjusting circuit color balances the electronic image at a compensation point located on the reverse color space vector to provide a compensated image. An image display, disposed on the outside of the body, shows the compensated image.

The invention discloses a voltage stability assessment method for a multi-infeed AC/DC hybrid power system. On the basis of a multi-infeed effective short circuit ratio considering shunt capacitor compensation, a reactive power conversion factor is adopted for describing an influence degree on voltage of a DC system by a shunt capacitor compensation point in an AC system, a conversion method is adopted for acquiring reactive power influence quantity on the DC system by a shunt capacitor connected with each compensation point in the AC system, reactive power influence quantities on the DC system by all shunt capacitor compensation points in the system are accumulated, and bad influences on voltage stability of the DC system by whole system shunt compensation are acquired. According to the whole system reactive power influence quantities, the effective short circuit ratio is acquired, influences included in shunt capacitor compensation are further acquired, and stability of the power system is assessed according to the effective short circuit ratio. Compared with the current AC/DC hybrid power system voltage stability assessment method on the basis of the multi-infeed effective short circuit ratio, the method provided by the invention has high accuracy, and provides a basis for planning and operation of a multi-DC infeed power grid system.

The invention discloses a method for realizing thermal compensation of a lead screw of a numerical control machine tool. The method for realizing thermal compensation of the lead screw of the numerical control machine tool comprises the steps of a. detecting thermal deformation of each linear-axis lead screw of the machine tool and dividing the thermal deformation into a plurality of levels according to a stepped manner from zero to the maximum deformation; b. dividing lead screw thermal compensation sections against machine tool coordinates, wherein a compensation point is set for each section; c. detecting the positioning accuracy error of each section of a corresponding coordinate axis of the machine tool when each linear-axis lead screw of the machine tool is thermally deformed at each level; d. establishing a machine tool lead screw thermal compensation database; e. developing a thermal compensation controller and converting treatment of thermal deformation at each level to corresponding thermal compensation control codes; f. acquiring a current compensation amount from the thermal compensation database according to a current compensation control code and a machine tool coordinate position, and conducting real-time dynamic compensation to the thermal deformation of the lead screw. By adopting the method for realizing thermal compensation of the lead screw of the numerical control machine tool, uncertainty factors caused by indirect prediction of lead screw thermal deformation through lead screw temperature change are avoided, and the actual situation of the thermal deformation of the lead screw of the machine tool can be more truly reflected.

The present invention relates to an axial line correction method of a cylindrical workpiece. According to the method, the spatial relative position of the workpiece under a measurement coordinate system is determined based on the design of the reference point C0 of the end surface of the workpiece; the first correction deltax and deltay of the deviation of a positioning section ZA and a positioning section ZB of the workpiece on an X axis and a Y axis are realized through using two groups of symmetrically-correlated compensation points on the positioning section ZA and the positioning sectionZB of the workpiece; the outlines of the positioning section ZA and the positioning section ZB are resampled, so that sampling points are obtained, a center point O'A and a center point O'B are obtained through fitting calculation; with a straight line determined by the center point O'A and the center point O'B adopted as a reference axis phi of the cylindrical workpiece, a geometric relationshipwith the reference point C0 is built and is solved; and the calibration and correction of a relative deviation angle theta between the reference axis phi and the Z axis of the measurement coordinate system are realized. The present invention also provides a diameter measurement method of the sectioned section of a cylindrical workpiece. According to the diameter measurement method, a geometric relationship between the correction values deltax and deltay of positioning sections and a measured section is built; linear compensation values deltaxi and deltayi are obtained; the coordinates of a probe relative to a sampling point are calculated; integrated and automatic sampling on the outline of the measured section is realized; and a spatial projection and fitting algorithm is adopted to process sampling data to obtain the quantity value of the measured section.

The invention provides a static var compensation device current detection method based on transient power balance. The static var compensation device current detection method specifically comprises the following steps of: performing phase locking on the phase voltage of an A phase on the low voltage side of a transformer and the phase voltage of the A phase at a compensation point of a static var compensator (STATCOM); performing abc/pq transformation on the three-phase current n the low voltage side of the transformer according to a direction of a rotation vector of the phase voltage on the low voltage side of the transformer to obtain a reactive DC component of load current; converting the reactive DC component of the load current into a reactive current DC component required to be injected into the compensation point of the STATCOM as a q-axis DC component iqref of the output reference current of the STATCOM according to a transient power balance principle; and performing abc/pq inverse transformation on the iqref according to the direction of the rotation vector of the phase voltage at the compensation point of the STATCOM to obtain a three-phase output reactive current directive value of the STATCOM to control the actual output current of the STATCOM. By the method, the problems of current detection caused by the transformer crossing of the compensation point of the STATCOM and a load current detection point are solved, the STATCOM can be flexibly arranged at any position, and simultaneously, a reactive current detection algorithm is quick in response.

Provided is a double compensation method and a device for moving tilt of a numerical control floor type boring-milling machine ram. The method includes that 1) a spindle box is provided with a spindle box tilt compensation mechanism and the ram is provided with a ram droop compensation mechanism, 2) ram droop quantity and spindle box tilt degree of all compensation points of the horizontal direct, namely a Z axis of the ram is measured through measurement tools, and measured data is input in a programmable logic controller, 3) coordinate value of the ram on the Z axis is detected by a detection element during operation of a machine tool, 4) corresponding ram droop quantity and spindle box tilt degree are looked up in the programmable logic controller according to the detected coordinate value, and 5) each coordinate value is calculated according to the ram droop quantity and the spindle box tilt degree and converted to compensation voltage, then compensation voltage signals are output to an electro-hydraulic proportional valve after being amplified by an amplifier, and the electro-hydraulic proportional valve controls a deformation compensation mechanism arranged on the ram and an inclination compensation mechanism of the spindle box.

The invention provides a high-voltage transmission line distance protection method based on parametric recognition. The method comprises the following steps: collecting a three-phase voltage and a current; performing low-pass filtering, sampling holding and A/D (Analog to Digital) conversion on the sampled three-phase voltage and current, thereby acquiring a three-phase sampling value; performing phase-to-analog conversion on the three-phase sampling value, using a compensation algorithm which takes a line frequency-changing parameter characteristic into account to compensate till reaching the tail end of the line, and acquiring the three-phase voltage and the current of a compensation point by performing the phase-to-analog conversion; and utilizing three-coefficient differential equation algorithms of corresponding phases to calculate three phases, combining with a fault phase element result, and confirming a fault position according to a fault phase calculated result when a single-phase grounding fault occurs. The high-voltage transmission line distance protection method based on parametric recognition has the advantages that the influences of a long-line distributed parameter and a fault transient state are overcome; the influence of line parameter frequency change is overcome; the transition resistance resisting capability of distance protection is greatly promoted, especially the transition resistance resisting capability close to the tail end of the line; and when fault occurs at the tail end of the line, the method is used for greatly promoting the transition resistance resisting capability under the condition of ensuring the protection being free from exceeding.

The invention discloses a comprehensive control method for voltage stabilization of a large-scale wind electricity switching-in weak sending end electrical power system. The comprehensive control method includes the steps that continuous load flow calculation is used for obtaining a voltage stabilization limit point through solution , and a static voltage stability margin is obtained through solution according to the obtained voltage stabilization limit point; in a normal operation mode, when the static voltage stability margin is lower than 10%, comprehensive control over the voltage stabilization is started; according to a voltage operation limit value issued by a power grid dispatching center, a generatrix with voltage exceeding an upper limit or a lower limit is selected as a generatrix to be adjusted; by the adoption of a sensitivity analyzing method, according to the voltage or reactive sensitivity, the compensation sequence of reactive compensation devices at the positions of different generatrixes is determined; the voltage operation limit value issued by the power grid dispatching center is compared with a voltage practical value to obtain the direction and degree, deviating from the limit value, of the generatrix to be adjusted, and compensation measures for reactive compensation points are determined. The comprehensive control method solves the problems that the large-scale wind electricity switching-in weak sending end electrical power system is poor in voltage stabilization, the quality of the system voltage is low, and wind electricity output is limited.

The invention provides a voltage reactive control method and a voltage reactive control system based on a reactive compensation device. The method comprises the following steps of determining an installation position for installing the reactive compensation device in a power distribution network branch, recording the installation position as a compensation point of the power distribution network branch; taking a head end and a tail end of the power distribution network branch as monitoring points, and monitoring voltage/current of each monitoring point and voltage/current of each compensation point; regulating capacity of the reactive compensation device at each compensation point according to the monitored voltage/current, thereby realizing voltage reactive regulation on the whole power distribution network branch. According to the invention, voltage/current of each monitoring point and voltage/current of each compensation point of the power distribution network branch are monitored, and capacity of the reactive compensation device at each compensation point is regulated according to the monitoring result, thus, voltage reactive compensation for multiple parts of the power distribution network branch is realized, and complex needs of an electric system are satisfied.

The invention provides a reactive compensation optimization method of 400V distribution network areas per transformer. The characteristic parameters of the 400V distribution network areas per transformer are calculated, and distribution network areas per transformer with the power supply radius and the peak load rate higher than preset thresholds serve as the distribution network areas per transformer requiring reactive compensation; for the distribution network areas per transformer requiring reactive compensation, a network topological graph of the areas per transformer is constructed according to the line connecting mode, the line length and the load power of the distribution network areas per transformer, the network loss reactive sensitivities of all nodes in the network topological graph are calculated, and reactive compensation points are determined; a reactive optimization model is established with the smallest network loss as a target function, the reactive optimization model is solved through a prime-dual interior point method, a penalty function is introduced to achieve successive warping of a discrete variable in the optimization process, and the best compensation capacity is determined; by comparing the network loss and the voltage quality before and after the optimization configuration, the compensation effect is judged. Through the method, reactive compensation for the distribution network areas per transformer can be optimized, and the accuracy of reactive compensation for the distribution network areas per transformer can be improved.

The invention discloses a dynamic reactive planning site-selection analysis method and system considering transient voltage stability. The dynamic reactive planning site-selection analysis method comprises the steps of obtaining related data of a power grid firstly; then performing simulation analysis on the transient voltage stability of the power grid, analyzing the power grid faults to determine a transient voltage instability fault set, and dividing the transient voltage instability fault set into multiple transient voltage stable weak regions; next, calculating the dynamic reactive compensation sensitivity under each fault state, and determining the number and locations of the to-be-compensated points of one of the power grid fault weak region through a panning site-location combinational analysis method; and finally, outputting the position scheme of the dynamic reactive planning site-selection to-be-selected points of all the transient voltage stable weak regions. Compared with the prior art, the dynamic reactive planning site-selection analysis method and system are suitable for dynamic reactive planning site-selection in the alternating current/direct current hybrid power grid, have the advantages of high efficiency, simplicity, tight combination with engineering and the like; and in addition, the redundancy of the dynamic reactive planning site-selection to-be-selected compensation points can be effectively prevented.

The invention discloses a novel series capacitor compensation circuit distance protection method by combining a phase-comparison relay. The method is characterized by comprising the following steps: 1) calculation of compensation voltage: using the series capacitor installation position (before capacitors) as a compensation point, and utilizing the current and voltage values on the protection installation position to calculate compensation voltage *S; 2) action judgment of the phase-comparison relay, carrying out phase comparison on the calculated compensation voltage *S and the correspondingpositive sequence voltage on the protection installation position; 3) protection logic, if the phase-comparison relay acts, the distance protection is directly carried out without overriding measures;if not, the level detection logic is carried out on failure of the phase-comparison relay. The invention can enhance the sensitivity of distance protection on the basis of reliable overriding prevention. When a compensation capacitor is arranged at the tail end of the circuit, the sensitivity of distance protection is basically free from the effect of the compensation capacitor, the reliability is high, and the distance protection is easy to realize.

The invention provides a multi-infeed-short-circuit-ratio-based dynamic reactive compensation point selection method. The method comprises the following steps: establishing a jacobian matrix and solving a voltage impact factor; determining a multi-infeed short circuit ratio according to the voltage impact factor; establishing effect evaluation objective functions of dynamic reactive compensation apparatus installation at all stations and corresponding constraint conditions; and selecting an optimal dynamic reactive compensation apparatus installation point by using a genetic algorithm. According to the invention, with consideration of the interactive influence between multi-loop direct-current lines, an effective method and an effective technical support are provided for selection of a dynamic reactive compensation apparatus installation point at a direct-current multi-infeed area of the country; and because the influences on the system stability by response characteristics of all elements during the dynamic process are taken into consideration, the point selection method is practical and has the engineering application value. Dynamic point selection optimization is carried out by using the genetic algorithm, so that the calculation efficiency is high.

The invention provides an optimal configuration of a 10 kV power distribution network parallel reactor and a compensation method of the 10 kV power distribution network parallel reactor. The optimal configuration of the 10 kV power distribution network parallel reactor and the compensation method of the 10 kV power distribution network parallel reactor are used for solving the problem that inductive reactive power optimal allocation of resources of insertion of small hydro to power distribution network and controlling switching of the reactive power compensation. The compensation method of the 10 kV power distribution network parallel reactor comprises the following steps: obtaining a voltage drop reactive decoupling formula by means of a decoupling deduction of the voltage drop formula; ensuring reactive decoupling coefficient according to the line reactance per kilometer and the line voltage reference; ensuring an optimal configured compensation point of the 10 kV parallel reactor according to the voltage drop reactive decoupling formula; ensuring and avoiding the capacity of the 10 kV parallel reactor configuration of the upper limit of the node voltage of a trunk line, and ensuring the capacity of a single unit and the number of configured groups of the 10 kV parallel reactor by a reference of a rule that a voltage regulating effect of reactive compensation equipment of a single group of a transformer substation does not exceed 2.5% of the rated voltage; and monitoring the node voltage of the trunk line including the small hydro in real time, and controlling the switching of the 10 kV parallel reactor according to the voltage drop reactive decoupling formula.

The invention relates to a control compensation system of quality of electric energy of a magnetic suspension train, which comprises a passive filter bank and an active power filter which is connected with the passive filter bank in series through a transformer; a bypass inductor is also connected on the transformer in parallel; and the system also comprises a high-order passive filter which is connected with the passive filter bank and the active power filter in parallel. The active power filter is controlled into a reverse harmonic current source to enable the fundamental reactive current to mainly pass through the inductor, the transformer and the inductor reduce the capacity of the active power filter, the active power filter and the passive filter bank together filter the harmonics, and the high-order passive filter mainly filters the high-order harmonics which can not be filtered by the active power filter and the passive filter bank. The compensation system is connected to the 20kV side of a bus in a tractive power supply system of a high-speed magnetic suspension train to shorten the distance between a compensation point and a point of common coupling (PCC), thereby shortening the length of a coupling line, further weakening the amplification effect on harmonics and voltage fluctuation by the circuit, and improving the quality of electric energy.

The invention relates to a method for measuring a grounded resistance of a grounded screen by a short range measuring method, which comprises the following steps: selecting the position of an current electrode; carrying out simulation calculation on the ground potential distribution of an earth screen without the current electrode and an earth screen with the current electrode according to the true form of the grounded screen to be measured by a numerical computing method so as to determine the position of a compensation point, i.e. the measuring position of a voltage electrode; and finally carrying out measurement to obtain the value of the ground resistance. The method for measuring the grounded resistance of a transformer substation by the short range measuring method provided by the invention adopts a shorter current electrode and a voltage electrode lead to realize measuring the grounded resistance by the short range measuring method according to the potential compensation principle, saves manpower and material resources, and has important project practical value.

The invention discloses a curved surface display panel correction method and system. The curved surface display panel correction method comprises steps of providing a curved surface display panel andan optical sensor, photographing the curved surface display panel through the optical sensor, obtaining position information of an image default compensation point of the curved surface display panelaccording to a collected image, obtaining corrected position information of the image default compensation point, calculating an image default position compensation value of the curved surface displaypanel through a processing module according to the obtained position information of the image default compensation point, storing the image default position compensation value into a time sequence control module and assembling the time sequence control module with the curved surface display panel. As a result, the curved surface display panel correction method and system can correctly find the position of the compensation point in the curved surface display panel, performs correct default compensation on the curved surface display panel under a curved surface state and improves quality of a product of the curved surface display panel.

The invention discloses an air conditioner compressor rotational speed fluctuation suppressing method. The method includes the following steps that: when an air conditioner compressor operates under a given rotational speed, a sinusoid represents by an equation that S(t)=Asin (omegat+P) is constructed; the amplitude A in the above equation is set as A=K*deltaIq/deltaN; the value of the amplitude A is kept constant, and the value of the initial phase P is adjusted, and an initial phase P under minimum speed fluctuation recorded, and the initial phase P at this moment is an optimal compensation phase; the value of K is adjusted according to the initial phase P under the under minimum speed fluctuation, and the adjustment value of K under the under minimum speed fluctuation is recorded, and a corresponding amplitude A is an optimal compensation amplitude; and the rotation speed N is adjusted, and the above steps are repeated, so that a plurality of groups of optimal compensation points are obtained; and when an air conditioner compressor operates, if the set rotation speed N is an optimal compensation point, a corresponding optimal amplitude A and initial phase P are selected, and if the set rotation speed N is not an optimal compensation point, a point insertion method is adopted to calculate an optimal amplitude A and an initial phase P at the set rotation speed N. With the air conditioner compressor rotational speed fluctuation suppressing method of the invention adopted, the problem of speed fluctuation caused by the cyclical pulsation of the load torque of the air conditioner compressor can be solved.

The invention discloses a common voltage compensation circuit, a compensation method, a display panel and a display device. The common voltage compensation circuit converts a common voltage analog signal of a sampling point to a digital signal sampling value via a first conversion module; according to the sampling value, a standard value generated by a decoding module, the preset gain times and the compensation times, through calculation, a processing module determines a signal for common voltage compensation, the compensation signal is thus converted to an analog quantity through a second conversion module, the analog quantity is outputted to a compensation point, real-time common voltage compensation on the display panel is thus realized, and as for a compensation point in a different area, a different compensation value is determined and compensation is carried out; and the common voltage signal adopts a digital quantity through a data bus during a transmission process to be transmitted to the decoding module, accuracy of the common voltage signal value in the case of long-distance transmission can be ensured, the common voltage signal analog quantity is converted into the digital quantity, calculation and comparison are easy to realize, and the design implementation and the operation of the common voltage compensation circuit are facilitated.

An automatic leveling method for 3D print includes: acquiring three-dimensional coordinate values of one reference point and four compensation points of a print platform; constructing a reference plane and a fitting plane according to the reference plane and the four compensation points; calculating a compensation value of the fitting plane with respect to the reference plane; and adjusting the height of a z axis of a print head according to the compensation value so as to perform printing. The automatic leveling method can effectively reduce errors of 3D print.