43results about How to "Change topology" patented technology

The invention discloses an electric field coupled power transfer system and a control method based on the novel topology. The system comprises a high-frequency inverter, a high-frequency resonator, an electric field coupling mechanism and an electric energy conversion link, and is characterized in that the high-frequency inverter is a double-E type amplifying high-frequency inverter, a high-frequency transformer is arranged between the high-frequency inverter and the high-frequency resonator, the high-frequency resonator is further connected with a controller, and the output end of the controller is connected with an inductance compensation tuning module and a drive circuit. The electric field coupled power transfer system has the obvious effects that the high-frequency voltage at the two ends of a coupling mechanism is increased, the strength of an electric field is enhanced, the transmission distance is lengthened, the voltage at the two ends of a high-frequency switch tube is increased to meet the requirement of high-frequency power electronic devices at the present stage, the power capacity of the system is improved, the voltage of the switch tube is reduced, the switch loss is reduced, and the adaptive ability of the system is improved.

The invention discloses a networked distribution type multiple-mobile-robot system which comprises an upper computer measurement and control system and a multiple-mobile-robot set. The upper computer measurement and control system comprises an upper computer monitoring unit and a communication network unit. Mobile robots make decisions according to sensor information obtained by a sensor detection unit and network information received by the mobile robots, operation conditions of the mobile robots are controlled, and the mobile robots operate in a coordinated mode according to a coordination algorithm of the multiple-mobile-robot set. Compared with the prior art, the networked distribution type multiple-mobile-robot system has the advantages of being simple in structure, strong in function, convenient to develop and the like. Multiple sensors replace a visual processing method, so that data processing complexity is lowered; a ZigBee wireless network based on CC2530 is constructed so that a topological structure of the multiple-mobile-robot set can be conveniently changed, and a good experiment platform is provided for studies such as coordination, fault tolerance and self healing.

The invention discloses an alternative-current/direct-current (AC/DC) dual-purpose motor control system, which is characterized in that: an electric power electronic part Insulated Gate Bipolar Transistor (IGBT) is adopted as a non-contact controllable switch to form a control main circuit, a digital microprocessor is adopted as a control core to form a micro-controller-based AC/DC dual-purpose motor control system. The control main circuit firstly adopts four power diodes to form a single-phase full-wave rectifier bridge, so an external AC power supply system and an external DC power supply system are unified to an internal DC power supply. An AC/DC dual-purpose motor control topology main circuit is arranged behind the rectifier bridge. The IGBT in the control topology main circuit is connected and disconnected according to a given discipline, so the connection order of different homonymous ends of a motor exciting winding and an armature winding can be realized, and the motor can run in the positive direction and the opposite direction or can be braked in the positive direction and the opposite direction. Due to the adoption of the AC/DC dual-purpose motor control system, the service life of the system is greatly improved, the electric arc and spark of the switch can be eliminated, the size can be reduced, and complicated functions of an AC/DC dual-purpose such as soft starting, stepless speed regulation and the like can be realized. The invention also provides a full-digital communication field bus interface so as to realize the remote monitoring of a field bus.

The invention discloses a constant-current constant-voltage inductive wireless charging system of triple-coil structure, having a transmitting portion, a receiving portion and a constant current constant voltage switching portion. The input end of high-frequency inverter H is connected with direct-current power source E, the output end of the high-frequency inverter H is serially connected with primary compensating capacitor CP and is then connected to secondary coil LP to form the transmitting portion; in the composition of the receiving portion, the input end of rectifier filter circuit D isconnected with secondary coil LS, and secondary compensating capacitor CS is serially connected between the input end and the secondary coil LS, and the output end of the rectifier filter circuit D is connected with battery load Z. The constant current constant voltage switching portion has third coil L3, the third coil L3, the primary coil LP and the secondary coil LS form a mutual inductance coil, the third coil L3 is serially connected with third coil compensating capacitor C3 and changeover switch I S1, and the control end of the changeover switch I S1 is connected with controller I K1. The constant-current constant-voltage inductive wireless charging system is capable of outputting constant current and constant voltage that are irrelevant to a load, and capable of operating under a frequency point; the constant-current constant-voltage inductive wireless charging system is simple in circuit structure and low in cost, has no need for complex control strategies, and is good in control simplicity, convenience and reliability.

The invention discloses a voltage and power flow combined control method considering running cost for an active power distribution network. The method comprises the following steps of: (1) automatically detecting/forecasting voltage and power flow in the network, and judging whether an overrun phenomenon occurs or not; (2) building a case library applicable for voltage control of the active power distribution network; (3) retrieving the case library by a nearest neighbor method in a case-based reasoning when the voltage of arbitrary one bus in the power distribution network is recognized to exceed the limit by the system, and searching out N voltage control methods with highest similarity, wherein N is an integer more than 1; (4) calculating a power flow constraint method by a constraint satisfaction algorithm when the power flow of arbitrary one circuit in the power distribution network is recognized to exceed the limit value by the system; (5) carrying out on-line simulation test on the control method; and (6) optimizing the running cost. By the embodiment of the invention, the safety margin requirement for running of the power distribution network is satisfied in real time, and the running reliability and activeness of the power distribution network is effectively improved; and meanwhile, guidance is provided for running and short-term planning of the power distribution network, and favorable economic benefit and social benefit are achieved.

The invention provides a distribution network simulation system. The system comprises a simulation distribution network, a fault simulation device which is arranged in the distribution network to trigger a fault in the distribution network, section switches distributed in the distribution network to isolate the fault, a collecting device which is arranged in the distribution network to collect the voltage and current of each node of the distribution network, a control device which is connected with the fault simulation device, the section switches and the collecting device, a human-computer interaction device which is communicatively connected with the control device to set the fault of the distribution network, and a recorder which is arranged in the distribution network, is communicatively connected with the human-computer interaction device, and is used for recording the change of the electric quantity of the distribution network before and after the fault and feeding back the change to the human-computer interaction device. The distribution network simulation system provided by the invention can comprehensively and accurately simulate the dynamic behaviors of the distribution network under normal operation and fault condition, and is visual, broad, flexible and integral.

The invention discloses a gridded temperature control system for a concrete dam. The gridded temperature control system for the concrete dam comprises a real-time inductor, a temperature control server and a rapid regulation-control machine which are sequentially connected. The gridded temperature control system for the concrete dam further comprises a database server, wherein the rapid regulation-control machine comprises a plurality of industrial personal computers, a plurality of temperature compensation sources, a plurality of PLCs, a pipe network with a variable topology structure and a wireless base station, the pipe network with the variable topology structure comprises a plurality of gridded multi-pass control units, and the temperature compensation sources, the PLCs and the wireless base station are connected with the industrial personal computers separately; the database server is connected with the real-time inductor and the rapid regulation-control machine separately; and the pipe network with the variable topology structure is arranged in a dam body. According to the gridded temperature control system for the concrete dam, a temperature control pipeline for the dam isgridded, and a sensor group is arranged around grid nodes, so that the flexibility and pertinence of temperature regulation-control for the dam are improved; and adverse factors possibly occurring inthe temperature regulation-control for the dam are predicated in advance, and a traditional passive temperature regulation-control manner is changed into active temperature regulation-control, so thatthe uncertainty of the temperature regulation-control for the dam is reduced.

The invention relates to a linear impedance stabilization network, which comprises a first branch circuit consisting of at least two series-connected inductors, a second branch circuit consisting of at least two series-connected inductors, a third branch circuit as a grounding wire, a first capacitor which is used for fire wire noise isolation and is in bridge connection between one end of a first branch circuit electric network side and the third branch circuit, a second capacitor for fire wire noise isolation, a third capacitor which is used for neutral wire noise isolation and is in bridge connection between one end of a second branch circuit electric network side and the third branch circuit, and a fourth capacitor which is used for neutral wire noise isolation and is in bridge connection between one end of a second branch circuit load side and the third branch circuit. The invention can measure conducted electromagnetic interference noise of high-power equipment, reduces the effect of parasitic parameters, improves performances, simplifies production process and saves production cost.

The invention discloses a constant-current constant-voltage induction type wireless charging system of a three-coil structure. The system comprises a transmitting circuit, a receiving circuit and a constant-current constant-voltage switching circuit. The transmitting circuit comprises a DC power supply, a high-frequency inverter, a primary compensation capacitor and a primary coil connected successively; the receiving circuit comprises a secondary coil, a secondary compensation capacitor, a rectification filtering circuit and a battery load connected successively; the constant-current constant-voltage switching circuit comprises a third coil, a third coil compensation capacitor and a change over switching connected successively, and the control end of the change over switch is connected with a controller; and every two of primary, secondary and third coils for a mutual coil. Both constant current and constant voltage can be output, the system works in one frequency point, frequency bifurcation does not occur, the system works stably, control is convenient, the structure is simple and reliable and the manufacturing cost is low.

The invention discloses an urban street network toughness quantitative measurement method, which comprises the following steps: acquiring space vector data of an urban street network in a target research city according to network open source map data; determining semantic models of points and edges of a street network, and mapping an actual space into network topological structure data formed by the points and the edges; designing random removal and sorting removal experiments to carry out dynamic deduction and iterative simulation; and drawing a relation curve between the urban street network performance index change and the removal ratio, and determining the structure change threshold point of the street network and the disturbance bearing capability of the street network. According to the invention, the structural evolution and toughness characteristic change of the street network in the disturbance process can be disclosed, so that a quantitative measurement method and a calculation model for the toughness of the urban street network are established from a dynamic mechanism level, and key thresholds and important nodes for keeping the street network structure are identified; and a technical tool can be provided for pointedly enhancing the street network toughness level in planning practice.

The invention discloses an image feature fusion method and device, and a medium. The image feature fusion method comprises the following steps: inputting at least two images with an association relationship into a feature extraction network; respectively extracting feature information corresponding to each of the at least two images through the feature extraction network; providing the extracted feature information as point feature information of each node in the graph convolutional neural network; determining the fused feature information of each node through a convolutional neural network and based on the point feature information of each node and the edge feature information of the edge connected with each node; based on the fused feature information of each node, updating the feature information corresponding to each of the at least two images to obtain fusion feature information corresponding to each image, the edge feature information being a weight value indicating the degree ofdependence between two connected nodes, and the degree of dependence comprising at least three different levels.

The invention discloses a bypass authentication and audit method. The bypass authentication and audit method comprises steps that (1), authentication and audit equipment is accessed to a three-layer switch or a router and realizes network isolation from a user terminal; step (2), a port mirror image function of the three-layer switch or the router is utilized, and networking data of a user is transferred to the authentication and audit equipment in a mirror image mode; step (3), the direction of the data is determined by the authentication and audit equipment according to an MAC address of a gateway of a user; and step (4), a network access request of the user is analyzed by the authentication and audit equipment, and the authentication and audit function for the user data is further carried out. The method is advantaged in that the user can be prevented from changing the network topological structure, and reconstruction cost of the user is reduced; equipment performance requirements of the user during use are reduced, and cost is reduced; when the equipment being used by the user is in a fault, only the authentication and audit function fails, and normal network access of the user is not influenced.

The invention discloses an outer conductor electrode structure of a homogenized planar photoconductive switch electric field, a photoconductive switch device and a method, and belongs to the technicalfield of pulse power. The outer conductor electrode structure is composed of a metal cube block material, and the surface of the metal cube block material is plated with at least one metal plating layer. Moreover, the upper side edge and the lower side edge of the outer conductor electrode structure form a chamfer structure, electric field intensity of the electrode edge of the device is effectively reduced, a voltage endurance capability of the device is remarkably improved and a damage to the electrode edge is inhibited, reliability of the device during operation is improved, and the service life of the device is prolonged. And meanwhile, an outer conductor can quickly transfer heat generated at the edge of the electrode when the device continuously works by virtue of good thermal conductivity of the outer conductor so that thermal damage is avoided.

The invention discloses a power conversion circuit for an LCC-S wireless power transmission system. The power conversion circuit comprises a high-frequency inverter circuit, a transmitting end resonance circuit, a receiving end resonance circuit and a receiving end power change circuit, the high-frequency inverter circuit is connected with a direct-current power supply, the receiving end resonancecircuit is connected with a load, and the receiving end power change circuit comprises a switching tube S1, a switching tube S2, a switching tube S3, a switching tube S4 and a filter capacitor C2; when the current generated by the receiving end resonance circuit is positive, the switching tube S1, the switching tube S2, the switching tube S4 and the filter capacitor C2 form a boosted circuit; andwhen the current generated by the receiving end resonance circuit is negative, the switching tube S1, the switching tube S2, the switching tube S3 and the filter capacitor C2 form a boosted circuit.According to the circuit, the topological structure of a receiving end power conversion circuit is changed, and the number of devices is reduced; a GaN FET is selected as a high-frequency switching device, so that the switching loss and reverse recovery loss of the high-frequency device are greatly reduced; and a synchronous rectification technology is adopted, so that the conduction loss of the device is further reduced.

The invention relates to a three-leg multi-level converter (TMC), in which two load legs are used to establish a voltage at an AC end of a phase leg and a current flowing through the AC end, and two ends of the third bridge arm are respectively connected with the two load bridge arms, and the third bridge arm is used for establishing balance current to realize voltage balance of sub-module energy storage units in all electrical components in the converter circuit. According to the three-bridge-arm multi-level converter, by changing the configuration mode of the configurable circuit in the three-bridge-arm multi-level converter, a class of multi-level converters with different topologies and different structures can be obtained, and each phase of bridge arm is composed of three bridge arms. In the multi-level converter, some converters have the advantages of MMC, EO-AAC and other multi-level converters, and the number of sub-modules and the number of semiconductor switches used in the converter are much smaller than those of MMC and EO-AAC of the same level respectively.