42 results about "Access Grid" patented technology

The invention discloses a digital museum grid and the construction method thereof; the digital museum grid includes a grid portal device, a job dispatching and an execution management device, an information center, a resource retrieval service device, an ontology service device, a heterogeneous database accessing and integration device, a grid monitoring device and other devices. The method includes: establishing an ontology device to establish the instantiation relation between digital museum resource and the global ontology by semantic labeling, establishing the heterogeneous database accessing and integration device to provide a global uniform view and a uniform access interface of heterogeneous database resource for the users of grid system recourse, establishing the grid resource monitoring device to collect original state data of monitoring nodes and classify the data into uniform standard information format for visualization, establishing the grid portal device to provide grid resource accessing and service, application of execution and monitoring grid, and a service environment supporting the cooperative work of users. In the process of application, the invention utilizes grid middleware and receives job request through a grid job dispatch device to fulfill job dispatching and execution information management and to generate and manage the resource retrieval service device so as to index a grid service device through an information service device. The invention can realize the mutual communication and organic sharing of the massive digital museum resources in multidisciplinary field and eliminate the isolated island phenomena of sample information.

The invention discloses a distributed photovoltaic access grid comprehensive evaluation system and method. The system comprises a database module, a reliability evaluation module, a grid loss evaluation module, an equipment utilization rate evaluation module, a power quality evaluation module and a distributed photovoltaic access grid comprehensive evaluation module. The system can realize functions of reliability index calculation, grid loss index calculation, equipment utilization rate index calculation and power quality index calculation, and calculates a comprehensive evaluation score according to a configured weight, and evaluates influences imposed on a grid by distributed photovoltaic access. The system disclosed by the invention replaces a tedious manual calculation and evaluation process, and can comprehensively evaluate the influences imposed on the grid by the distributed photovoltaic access, thereby providing help for designing and decision-making of distributed photovoltaics.

The invention discloses an electric vehicle access grid charger capable of improving charging electric energy quality and a method. Zero crossing detection on access voltage and phase locking on a phase-locked loop are carried out in a control link, a standard sinusoidal instruction signal is formed, a corresponding PWM pulse signal is generated, the amplitude of a signal needed by a pulse signal generation circuit has nothing to do with the waveform amplitude of power voltage, and influences brought by voltage fluctuation at a power supply side or distortion can be avoided. The charger and the method of the invention are applicable to situations in which intermittent new energy sources such as wind energy and tidal energy are integrated to the electric vehicle for charging, influences caused by voltage distortion or amplitude fluctuation of the intermittent new energy sources can be effectively reduced, impact on power electronic devices of the charger is lessened, damages to a rechargeable battery are reduced, and the service life of the charger and the service life of the battery are improved.

The invention discloses a protection performance evaluation system and method at a same-tower four-circuit power transmission line. The method comprises: inputting a line structure parameter, access grid information and protection incorrect evaluation factor; controlling turning on or off of all switches of a first group to a fifth group of fault switches to realize controlling of a fault type; for any fault type, setting line lengths and fault point positions between double circuit towers and four-circuit towers; according to voltage levels and locations of all power supplies, adjusting parameters of corresponding transformers and impedors; and carrying out statistics of fault types and line protection actions at occurrence of faults at different positions and carrying out weighted statistics and evaluation on faults and protection actions of all power transmission lines, thereby obtaining a line protection performance quality evaluation report. According to the invention, various fault feature influence factors are considered comprehensively; some operation ways that may cause inaccurate protection actions easily can be avoided; protective setting and key prevention are realized; protection strategies of manufacturers can be protected; and the good support can be provided for secure and stable operation of the power grid.

The invention relates to a power system frequency modulation controllable electric automobile quantity dynamic change simulation method based on Monte Carlo, and belongs to the technical fields of electric automobiles and an access grid thereof. The method comprises the following steps: firstly, initializing relevant parameters of electric automobiles, secondly, judging types of the electric automobiles, and determining in/out controllable state time tables of all the electric automobiles, thirdly, making statistics and analyzing the time tables, so as to obtain the controllable electric automobile quantity N'in (ti) and the out controllable electric automobile quantity N'iout (ti) within every moment in a region, fourthly, computing the cumulative quantity of automobiles at in/out controllable state, and fifthly, computing the quantity of controllable electric automobiles. The method can properly compute the quantity of the controllable electric automobiles in the region, so as to obtain the quantity dynamic change of various types of the controllable electric automobiles participating in frequency modulation, meanwhile, the method fills the gap in the technical filed, and lays a solid theoretical foundation for deeply researching electric automobiles participating in frequency modulation.

The invention discloses a unit control loss reduction method of a wind power access grid. A control unit is controlled in a coordinated way with loss reduction and energy conservation acting as the objective so that the network loss can be reduced, corresponding unit division is performed on all the wind power plants, conventional power supplies and high energy load based on the grid-connected position and capacity data of the existing conventional power supplies, the high energy load and the wind power plants, and power coordination of the intra-unit and inter-unit conventional power supplies and high energy load can be reasonably performed according to the wind power output situation and thus the network loss is enabled to be minimized as much as possible.

The invention discloses a distributed parallel grid generation software framework. The framework comprises: a client module which has a visual data management function and is provided with a graphic human-computer interaction interface, a message intermediate module which is used for executing asynchronous message transceiving operation and visualized data serialization operation, and a server module which runs on a computing cluster in a parallel mode, supports distributed grid data management and executes a grid parallel generation function. According to the invention, the huge requirement of large-scale CFD application for the grid is met, and a user can access the grid generation service anytime and anywhere. The framework has a friendly graphical user interface (GUI) with which a usercan interact and drive the provided functions.

The invention discloses a reactive voltage control circuit simulation method and system for distributed grid-connected converter. The method includes: creating a corresponding circuit simulation modelin the power simulation software according to parameters of the plurality of grid-connected converters to be controlled; creating a reactive voltage control model, and connecting the reactive voltagecontrol model as a control logic circuit to a corresponding circuit simulation model; performing a voltage sag simulation experiment on the plurality of circuit simulation models to verify whether the circuit simulation model during the voltage sag can output excess reactive power support circuit voltage; performing a follow-up simulation experiment of reactive power on the plurality of circuit simulation models to verify the following performance of the circuit simulation model for rated power. The method and system establish a circuit simulation model and a reactive voltage circuit controlmodel, and obtain a control model that can be switched according to the access grid type control method through simulation experiments to meet different grid requirements of different usage scenarios.

The invention, which belongs to the technical field of the power supply equipment, provides a loop difference testing apparatus of a transformer substation direct-current power supply system. In order to solve problems existing in the prior art, the testing apparatus is characterized in that a direct-current output interface is connected with a direct-current fuse load terminal at a final stage and sends a current to a grid-connected inverter based on sampling of a current sampling circuit and a voltage sampling circuit. The grid-connected inverter converts the direct current into a grid-connected alternating current and transmits the current to an access grid unit; and the access grid unit transmits an alternating-current signal to the power grid back. The grid-connected inverter uses a computer to control and adjust different current outputs, thereby generating currents from 0 to 500A to enable a protection element of the direct-current power loop to make action. The current sampling circuit and the voltage sampling circuit can carry out sampling on a current value and a voltage value during the motion of a circuit breaker; signals are transmitted to an A/D converter simultaneously; the A/D converter converts analog signals into digital signals that are transmitted to the computer; the computer calculates the digital signals and determines the motion characteristic of the direct-current loop according to different currents and motion time; and then the computer inputs the signals into a report output unit by a report conversion tool.

The invention relates to a novel power equipment access power grid reliability assessment and optimization method and system. The method comprises the following steps: calculating the reliability of novel power equipment after access to a power grid according to a pre-established novel power equipment reliability model and the access position of the novel power equipment; comparing the reliabilitylevel change before and after the novel power equipment is connected to the power grid, and determining a power grid system reliability optimization target and a novel power equipment reliability optimization target; determining a weak module in the novel power equipment by performing sensitivity analysis on the reliability of the novel power equipment; the sensitivity of weak module constituentparts is analyzed through a perturbation method, and economic analysis is combined, so that the economic costs of different sub-modules are compared when the same reliability level is improved, and the constituent parts and the improvement amount which should be improved for improving the reliability of the sub-modules are determined; and the improved novel power equipment is connected to a powergrid, system reliability evaluation is carried out again, and the equipment optimization and improvement effect is judged. The reliability level can be improved.

The embodiment of the invention discloses an article storing and taking device. In a specific implementation mode, the device comprises a control module, an access cabinet and a storage device, wherein the access cabinet comprises a plurality of access grids, each access grid comprises a first grid door arranged on the first side of the access cabinet and a second grid door arranged on the second side of the access cabinet, and the first side and the second side are opposite sides of the access cabinet; the storage device comprises a rotating and placing mechanism and a plurality of bearing tables; the control module is used for responding to a storage instruction or a take-out instruction to open the first lattice door, responding to the storage instruction to open the second lattice door of the corresponding access lattice and controlling the transfer mechanism to take out the articles in the corresponding access lattice and transfer the articles on a vacant bearing table, and in response to the putting-back instruction to open a second lattice door of a vacant access lattice, controlling the rotating and placing mechanism to take out the articles on the corresponding bearing table and transfer the articles into the vacant access lattice. According to the embodiment, access resources of the access cabinet can be saved, and the operation efficiency of the access cabinet is improved.

The embodiment of the invention provides a baffle movement control method and device, a storage medium and intelligent logistics terminal equipment. The method comprises the steps of obtaining a baffle movement instruction, wherein the baffle movement instruction is used for indicating a baffle to move from the Nth access grid to the Mth access grid; then determining an expected rotation directionaccording to the baffle movement instruction, wherein the expected rotation direction is the rotation direction of a controlled motor enabling the baffle to move from the Nth access grid to the Mth access grid; then controlling the control motor to rotate in the expected rotation direction so as to drive the baffle to move towards the Mth access grid; and furthermore, acquiring sensor informationreturned by photoelectric sensors in the process of moving the baffle to the Mth access grid, and controlling the baffle to stop at the Mth access grid according to the sensor information. Accordingto the method provided by the invention, multi-point reliable baffle movement control can be realized, and the number of required photoelectric sensors is small, so that the cost of the intelligent logistics terminal equipment is greatly reduced.