96results about How to "Reduce the difficulty of setting" patented technology

The invention provides a photovoltaic grid connected inverter island detection method based on negative sequence current injection, belonging to the technical field of power system relay protection and automatic control. According to the method, an inverter is started to inject negative sequence current when a voltage harmonic distortion rate is larger than a fixed value, common connection point voltage unbalanced degree and voltage harmonic distortion rate are detected, when both the common connection point voltage unbalanced degree and the voltage harmonic distortion rate are larger than the respective fixed value and the duration time exceeds a set time, the generation of island is determined, and the rapid detection of the island is realized. According to the method, the setting difficulty of a criterion is reduced, the improvement of the detection speed is facilitated, the interference on a power grid is reduced as much as possible in the condition that the normal operation is ensured, the influence of a power grid asymmetrical fault is avoided, and there is no detection blind area. The simulation verification is carried out in the condition that the island detection is most not facilitated, and an island operation state still can be rapidly and accurately detected according to the method. A good method is provided for the operation withdrawal of a distributed power supply in the island or the turning of power grid connected operation into island operation control mode power system safe operation and the detection.

A method for positioning target under water automatically includes using wirerope on the ship to sink detection device down to water bottom at water area of target to be positioned and confirming its position through image; arranging sound wave receiversin linear array of intervals on water surface, launching sound wave to wards water surface by emitter; sending sound wave signal to computer for calculating out time difference, water depth and target water surface projection position value displayed in curve.

The invention discloses a vector control method of an alternating current asynchronous motor non-speed sensor, wherein a controller figures out rotor magnetic flux by using a voltage model, then calculates rotor speeds and synchronic angular speeds according to a magnetic flux sum, and then obtains magnetic flux linkage angles according to the synchronic angular speeds, and then obtains exciting current and torque current according to rotating transformation of coordinates, and then calculates the given torque current according to speed closed loops, and then calculates d-axis voltage and q-axis voltage according to feed-forward of the given exciting current and the given torque current. Because resistance information of the rotors is not included in the algorithm, the algorithm can be less affected by parametric variation of an asynchronous motor. The method of non-speed sensor vector quantity control adopting magnetic flux estimation and speed estimation can greatly reduce dependency of vector control on motor parameters, and has good low frequency torque and speed stabilizing precision features.

The invention provides a method for measuring foot length. The method includes acquiring a foot image which comprises a plurality of parallel scale lines with the radial direction of the foot intersected with the scale lines, conducting edge enhancement and binaryzation processing on the image, determining an interested area, acquiring two end points of the foot in the interested area and calculating foot length according to the two end points and the scale lines. A system for measuring foot length is further provided. Compared with the prior art, the method and the system achieve automation of the foot length measuring process by arranging an image analysis module and conducting machine processing, analysis and calculating on the foot image, and reduce manual operation quantity accordingly. In addition, arrangement of the scale lines enables image scaling proportion to be reacted through change of the scale lines. Simply, the foot length can be directly determined according to the multiple relation between the foot length and unit scale.

The invention discloses a five-phase permanent magnet embedded fault tolerant linear motor adjacent two-phase open circuit fault tolerant vector control method. Based on the principles that the magnetic motive force of traveling waves remains unchanged before and after a fault occurs and that the non-fault phase current sum stays at zero and taking the equality of the non-adjacent two-phase current amplitude as a constrained condition, the non-fault phase fault tolerant current is obtained to further deduce the generalized Clark transform matrix from the natural coordinate system of the non-fault phase to the two-phase stationary coordinate system. The non-fault opposite potential is observed by the transpose matrix of the transform matrix. A current internal model controller, a first-order inertial feed-forward voltage compensator and a counter-electromotive force observer are used to convert the nonlinear close coupling system of such motor under the condition of an adjacent two-phase open-circuit fault into a first-order inertial system. According to the invention, not only the thrust fluctuation caused by motor failure is restrained, but also more importantly, the dynamic performance and the steady-state performance are consistent with those under a normal condition to realize the fast response to non-overshoot and the stable switching frequency of a voltage source inverter.

The invention relates to an aircraft attitude control method based on nonlinear feedback and differential tracking. The nonlinear feedback based on a time-optimal control integrated function is used as an attitude controller, while a rapidity control index is raised by more than 3 times and a control precision index is raised by more than 50%, compared with the background technology, the difficulty of project implementation is greatly reduced, and 4 control parameters are still maintained. An integral chain differentiator is used to design an uncertainty compensator, while the anti-interference ability of the controller is maintained, only one control parameter is needed, but a compensator used by the background technology needs 7 parameters. The whole control scheme needs 5 parameters, the control parameters are reduced by more than 50% compared with the background technology, and the difficulty of parameter setting is greatly reduced. A firefly algorithm is used to carry out the optimization tuning of the controller parameters, the number of setting iterations is reduced by more than 10 times compared with background technology, which has high engineering applicability.

The invention discloses an underground anti-override tripping system based on a radio frequency network. The underground anti-override tripping system comprises a microcomputer integrated protection device and a communication server, wherein the microcomputer integrated protection device and the communication server are networked in a radio frequency and optical fiber combination mode. System parameters of the underground anti-override tripping system based on the radio frequency network are automatically generated and downloaded through the Ethernet. The technical problem of override tripping caused by difficulty in matching of superior and subordinate relay protection current constant values of an underground distribution system is solved. The underground anti-override tripping system based on the radio frequency network has the advantages that: by automatically configuring the system parameters and setting a locking relationship of the microcomputer integrated protection device, the overload override tripping of the underground distribution system is effectively prevented, the safety and stability of operation of an underground system are guaranteed, the difficulty of underground construction is reduced, and the safety of underground constructors is guaranteed.

The invention provides an industrial vehicle fork action automatic control method. In the method, a touch display screen or other man-machine dialogue equipment is used for presetting fork action programs and data for a series of actions such as lifting, side shifting, inclining, advancing and retreating in an electronic controller, thus automatically accessing the objective goods by a fork. The industrial vehicle fork action automatic control method is characterized in that the fork lifting action programs and data complete the preset access action of goods through hand operation of the fork, and are preset in combination of manual confirmation on the man-machine dialogue equipment. During the process of executing the set action programs and data of the fork, an operator is needed to confirm the action through the touch display screen or other man-machine dialogue equipment after the fork completes each lift action. The invention has the advantages as follows: (1) the setting of the action data of the fork is not subject to the precondition that the operation data have been verified; and (2) the safety of the automatic control operations of an industrial vehicle fork is improved.

The invention provides a display panel and a display device for fingerprint identification. The display panel comprises an array substrate and a plurality of light-emitting units arranged on the arraysubstrate. The array substrate comprises a substrate body and a thin film transistor layer arranged on the substrate body. The substrate comprises at least two organic film layers which are arrangedin a laminated manner. A conductive shading layer is arranged between the at least two organic film layers. The conductive shading layer is divided into a plurality of pressure-sensitive electrodes which are arranged at intervals. According to the display panel provided by the invention, the problem that the driving load of a pixel circuit is large due to the fact that capacitive coupling easily occurs between a conductive shading layer and the circuit in an existing under-screen fingerprint identification device is solved.

The invention discloses a five-phase permanent-magnet embedded fault-tolerant linear-motor non-adjacent two-phase fault-tolerant vector control method. According to principles that magnetomotive forces before and after a two-phase open-circuit fault are invariant and a non-fault-phase current sum is zero, a condition that adjacent two phase current amplitudes are equal is taken as a constraint condition so as to derive and popularize a Clark transformation matrix; matrix transposition is used to estimate a counter potential; and an inner model controller, a first-order inertia feedforward voltage compensator and a counter potential observer are used to change a nonlinear strong coupling system of the motor under a fault state into a first-order inertia system. According to a principle that a synthesized magnetomotive force of a non-fault-phase short circuit compensation current and a short circuit fault phase current is zero, a short circuit compensation voltage is calculated. The voltage is superposed with an output voltage of a vector control device. By using the method of the invention, a motor thrust fluctuation caused by one phase short circuit and one phase open circuit of non-adjacent two phases of the motor is restrained, and dynamic performance and stable state performance are consistent with the performance under a normal state.

The invention relates to an unmanned ship course active-disturbance-rejection control system based on a fuzzy neural network and a control method thereof, and the system comprises a linear active-disturbance-rejection control module and a fuzzy neural network module.The self-learning function of the fuzzy neural network is utilized to solve the problem that parameters need to be debugged through certain groping experience in fuzzy control, meanwhile, control parameters of the active disturbance rejection controller can be adjusted in a self-adaptive mode, and external disturbance of the unmanned ship and compensation of internal disturbance of the system at the control quantity can be well estimated through a linear expansion state observer; and the observer bandwidth is used as a unique parameter, so that the parameter setting difficulty is reduced.

The invention discloses a projection system. The projection system comprises a monochromatic source, a display chip, a galvanometer, a projection lens and a projection screen, wherein the display chip is used for receiving an emergent light beam of the monochromatic source and making the received light beam incident to the galvanometer after modulation, the galvanometer is used for changing a position of the light beam incident to the projection lens so as to change the position of the light beam incident to the projection screen through the projection lens, the projection screen is formed by arranging at least three simulated emission units according to a set rule, and each simulated emission unit is simulated to emit light with special color after illumination of the monochromatic source. The simulated emission unit contained in the projection screen can emit the light with special color after illumination, thus, a clear image can be displayed only by emitting the light ray with special color and special intensity at each pixel position of the projection screen provided by the embodiment of the invention, a curvature field does not exist under a large visual field, the projection lens is only needed to be used for imaging of monochromatic light, and the setting difficulty of the lens is greatly reduced.

The invention relates to a region backup protection method capable of being used for setting and simplifying distance II section protection. An existing distance II section protection setting method has large calculating amount and calculating difficulty. By means of the region backup protection method, according to the resistance value of a protected line, the setting value of distance II section protection is calculated only according to sensitivity requirements. Then, starting information of distance protection of an adjacent transformer substation is collected. Afterwards, a region backup protection criterion result is calculated. Finally, a protection action is determined according to the criterion result so as to correctly eliminate faults. The region backup protection method reduces setting difficulty of distance II section protection, reduces workloads, and improves quickness of distance II section protection.

The invention relates to a three-level Boost circuit control method and system. The method comprises the steps that a three-level Boost circuit is equivalent to two independent two-level Boost circuitseries connection modes; and two sets of same voltage outer loop and current inner loop cascade control modes are adopted to respectively control each two-level Boost circuit. Compared with an existing three-loop control mode of a voltage loop, a current loop and a grading ring, the method provided by the invention has the advantages that the three-level Boost circuit is controlled by using a double-loop control method; according to the method, on the basis of not increasing circuit hardware, the grading ring is omitted, and only PI adjustment parameters of the voltage loop and the current loop are set; the PI adjustment parameter positive definite process is optimized; the PI adjustment parameter setting difficulty is small; and the control frame structure is simpler, and the control stability is higher. According to the three-level Boost circuit control method, a corresponding control system is further designed to control the three-level Boost circuit.

The invention discloses a tunnel large-elevation-difference settlement measuring system, which comprises a liquid source water tank holding a liquid, more than one liquid pressure sensors, and a communicating pipe communicating the liquid source water tank and each liquid pressure sensor. Each liquid pressure sensor comprises a housing and more than one elevation-difference blocks. The portion, communicating the communicating pipe, of the bottom of the housing is defined as a liquid feeding port, and the liquid feeding port is connected to a went valve. An elastic pressure-sensitive element is pressed on and covers the inner bottom of the housing and the upper part of the liquid feeding port, and one elevation-difference block is arranged on the elastic pressure-sensitive element. According to the system, a pressure compensation means is utilized; when settlement measurement of a tunnel is performed in an environment, the inner space of which is limited, liquid levels of the liquid pressure sensors don't need to be adjusted to be uniform; transfer of overmuch relative datums is reduced; and at the same time, the system isn't limited by the elevation of a measurement point, and the measurement difficulty is lowered.

A pipe orifice butt joint device of a concrete pipeline is used for butt joint of a first pipeline and a second pipeline, the first pipeline is located at the downstream position where fluid flows, and the second pipeline is lifted by a crane in the mode that a spigot faces a bell mouth of the first pipeline and gradually moves to the state that the spigot and the bell mouth are communicated with each other. The device comprises a detection part, the two ends of the detection part are connected to a first axis point and a second axis point respectively, and the first axis point and the second axis point penetrate through the axis of the first pipeline and the axis of the second pipeline respectively. The detection part is configured to generate an elastic potential energy against offset in response to offset of theaxis of the second pipeline in a longitudinal plane relative to the axis of the first pipeline to generate a bending strain force on itself to guide a first axis point and a second axis point in a collinear and coaxial state and/or obtain a pipe orifice longitudinal gap based on a relative position relation of the first axis point and the second axis point on the longitudinal plane.

The invention discloses a Halbach array permanent magnet synchronous motor which comprises a stator (1), a rotor (2), Halbach array permanent magnets (4), a rotating shaft (5) and armature windings (6). The rotor (2) is positioned in the stator (1)and fixed on the rotating shaft (5), the Halbach array permanent magnets (4) are arranged on the rotor (2), the rotor (2) and the stator (1) are arranged between the rotor (2) and the stator (1), the armature winding (6) is arranged on the stator (1), and the same partition (7) is arranged between two adjacent permanent magnets of the Halbach array permanent magnets (4). According to the invention, no-load air gap magnetic field distortion of adjacent permanent magnet blocks of the Halbach array permanent magnet can be reduced, and the torque ripple of the motor is reduced.

The invention discloses a multifunctional bamboo-wound composite pipe gallery, and belongs to the related technical field of bamboo composite pipe galleries. By forming an anti-rotation groove in theend surface of one end of a pipe body, an anti-rotation component is arranged corresponding to the anti-rotation groove and connected with the end of a support component after being matched with the anti-rotation groove correspondingly, thus, the end of the support component is fixed, and real-time monitoring of the temperatures of pipe body structural layers is achieved by pre-embedding a plurality of temperature measuring components between the inner wall surface and the outer wall surface of the pipe body, so that the bamboo-wound composite pipe gallery has the support component anti-rotation function and the structural layer real-time temperature measurement function. The multifunctional bamboo-wound composite pipe gallery is formed by winding and bonding bamboo materials, and is simple in structure and easy to prepare, the anti-rotation function of the support component can be achieved, real-time temperature measurement of the structural layers can be achieved, the functionality of the bamboo-wound composite pipe gallery is greatly improved, the application cost and maintenance replacement cost of the pipe gallery are reduced, the service life of the pipe gallery is prolonged,unnecessary losses are avoided, and the pipe gallery has good promotion and application value.

The invention discloses an aerial fog generating device, which comprises a receiver comprising a first cavity and a second cavity, wherein the first cavity and the second cavity are two parts and canbe connected to form a receiving cavity, and a heater is arranged on the receiving cavity; a container which comprises a containing cavity, wherein the containing cavity is installed in the receivingcavity, an aerial fog forming base body is arranged in the containing cavity, and a heating opening is formed in the end, close to the heater, of the containing cavity; and a pushing structure which pushes the containing cavity, so that the heater is in contact with and separated from the aerial fog forming base body. According to the invention, the receiving cavity is formed by connecting the first cavity and the second cavity, so that a producer can firstly set the structures of the first cavity and the second cavity which are smaller in size and lighter in weight in the production process of the receiving cavity, and then connect the first cavity and the second cavity to form the receiving cavity, thereby reducing the setting difficulty of the structure of the receiving cavity.

The invention provides a mold ejection mechanism. The mold ejection mechanism comprises a shell, an ejection plate mechanism, a floating plate mechanism and a sliding structure. When the sliding structure struts the floating plate mechanism, the sliding structure slides to reach a preset position; and at the preset position, strutting of the floating plate mechanism is relieved, thus, the floatingplate mechanism performs retracting motion under the effect of a reset spring, and an ejection device is driven to retract at the same time. According to the mold ejection mechanism, the sliding structure is arranged between the ejection plate mechanism and the floating plate mechanism inside the shell and used for being strutted reversely by the floating plate mechanism while the sliding structure is driven by the ejection plate mechanism to move toward the floating plate mechanism, so that the sliding structure transversely moves toward the preset position; when the sliding structure transversely moves to the preset position, strutting of the floating plate mechanism can be relieved, and the floating plate mechanism can perform retracting motion under the effect of the reset spring; andthus, the ejection device is driven to retract at the same time to be separated from a product.