125 results about "Grid interface" patented technology

Systems, apparatus, and methods are presented to transfer energy between an energy storage device (ESD) at an electrified vehicle (EV) and an AC or DC external load such as an electric grid, appliance or power tool. A portable EVETA can engage an EV charge inlet couple an EV, and can provide an AC outlet, a grid interface and a DC connector for coupling external loads. An EVETA can be used at a remote construction site or campsite to power high current equipment, obviating the need to transport an electric generator. An EVETA can be configured for data and control communication with the EV to coordinate energy transfer. An EVETA can receive a predetermined ESD state of charge limit so that the transfer process can be terminated to preserve sufficient charge for EV return to a desired destination. A human machine interface enables user input reception and information display.

A real-time photovoltaic power plant control system and method of control for plant output, voltage regulation and/or power factor regulation. The system comprises a grid interface controller configured to receive power information from a power grid and provide commands for controlling at least one active or reactive power supplied to the power grid, a power plant controller configured to receive commands from the grid interface controller for and direct real-time output of the power plant, a plurality of local controllers connected to and controlled by the power plant controller, and a plurality of inverters each connected to supply power from at least one photovoltaic device to the power grid and arranged such that each local controller is connected to and controls at least one inverter, the inverters reporting status information in real-time back to the local controllers, and the local controller reporting status information in real-time back to the power plant controller.

Welding system and method permit exchange of data with Smart Grid monitors and/or controllers. The welding systems include a welding power supply configured to convert power between the power grid and the welding power supply. A grid interface cooperates with control circuitry to transmit data to and/or from the grid monitors and/or controllers on the grid side. The control circuitry may control operation of the welding power supply based upon data from the grid. The system may include power generation devices (e.g., engine-drive generators) and energy storage devices (e.g., batteries). The control circuitry may control operation of such devices, the exchange of power between them, and the draw of power from the grid or the application of power to the grid based upon the data exchanged with the grid monitors and/or controllers.

The invention discloses a photovoltaic direct-current micro-grid energy coordination control method. According to the control method, a master-slave parallel method and a direct-current bus voltage droop method are combined; in a grid connection mode, the master-slave parallel method is adopted, and a large-scale grid interface circuit maintains energy balance in a micro-grid and stabilizes direct-current bus voltage in the micro-grid; in an island mode, the direct-current bus voltage droop method is adopted for control, an interface circuit adjusts running modes of a photovoltaic array and an accumulator battery aiming for different states of the direct-current bus voltage. Therefore, effective control on output current is realized, energy balance of the micro-grid is maintained so as to ensure the direct-current bus voltage to be stabilized in a constant-voltage state, equal-current output of a system is realized, the direct-current micro-grid and the large-scale grid are combined organically, an energy supply system and a load are enabled to be well matched, reliable running of the system is guaranteed, energy loss can be effectively reduced, and energy consumption is reduced.

The invention provides a Godunov format one-dimensional and two-dimensional coupling technology-based mountain flood numerical simulation method. The method comprises the steps of acquiring corresponding data, discretizing a slope surface of a small watershed in a mountainous and hilly area by adopting a quadrilateral unstructured grid firstly, describing a motion process of overland flow of mountain flood by adopting a complete two-dimensional shallow water equation, taking a rainfall process as a driving item of a two-dimensional model, and calculating a numerical flux at a grid interface by adopting a Roe format; discretizing a mountain flood channel by adopting a one-dimensional finite volume unit, calculating a numerical flux at a unit interface by adopting an HLL format, and performing centralized inflow processing on inflow of a two-dimensional slope surface in one dimension; and realizing water volume exchange calculation of the two-dimensional slope surface and the one-dimensional channel by adopting a weir flow formula. According to the method provided by the invention, not only water power information of the mountain flood in the channel but also detailed water power information of the mountain flood on the watershed surface can be obtained; and the method has a clear physical mechanism, and only the roughness parameter of the whole model needs to be calibrated, so that the method is still suitable for areas lack of hydrological data.

The invention discloses a regional energy interconnected distribution network system based on a power routing technology. Regional power routers, variable-voltage power routers and branch power routers serving as core node devices are networked hierarchically to form a regional energy interconnected distribution network composed of an interconnected centralized control layer, a variable-voltage separate control layer and an interface extension layer which are distributed in a centralized manner and combined. The regional power routers are accessed into a traditional distribution network through a medium-voltage special line or a feed line to carry out AC-DC conversion to form medium-voltage AC and medium-voltage DC ring networks. The variable-voltage power routers are connected to medium-voltage AC and medium-voltage DC buses through medium-voltage AC and DC grid interfaces, and have the ability of AC-DC energy conversion and voltage transformation. AC and DC interfaces classified by function are formed on the low-voltage side, and the low-voltage AC and DC interfaces are extended through the branch power routers. The power routers are networked hierarchically and accessed into thetraditional distribution network. The permeability of distributed clean power generation can be further enhanced, and the requirements of different users for flexibility and power supply reliabilityare satisfied.

The future of the utility industry will be defined by how its leaders can transform the grid from a “passive” network of cables, wires, poles, and other hardware to a self-aware and fully controllable grid system—an Intelligent Grid System (IGS). We will discuss a novel set of design guidelines for utilities (and other industries) to build their own Open Intelligent Grid System with the lowest possible risk and cost, while achieving the architectural criteria, technical features and functions required. We will discuss how to avoid the dead ends to which limited design and architecture can lead, and we will lay out the design solutions that will overcome the business and technical challenges posed by an array of technology products and business imperatives. Using IGIN (Intelligent Grid Interface Node), one can integrate or connect hybrid networks for different purposes, such as power electric industry, telecommunication, computer network, and Internet.

According to an aspect of the invention, there is provided a method for optimizing a cost of electric power generation in a smart site energy management model, including providing a cost function that models a smart building-grid energy system of a plurality of buildings on a site interconnected with electric power grid energy resources and constraints due to a building model, an electric grid model, and a building-grid interface model, where decision variables for each of the building model, the electric grid model, and the building-grid interface model are box-constrained, and minimizing the cost function subject to the building model constraints, the electric grid model constraints, and building-grid interface model constraints.

The invention provides a system and method for testing a wind farm power control strategy. A wind farm power control strategy making module of the system comprises a network data receiving/transmitting module, a data analyzing module, a data-caching module, a data fault tolerance module, an active/reactive control module and a real-time data interaction module, wherein the network data receiving/transmitting module, the data analyzing module, the data-caching module, the data fault tolerance module, the active/reactive control module and the real-time data interaction module are connected in sequence. The output end of the data fault tolerance module is connected with the input end of the real-time data interaction module. Information interface is conducted between the wind farm power control strategy making module and a wind farm grid analog simulation module or an actual grid interface module through the network data receiving/transmitting module. According to the system and method for testing the wind farm power control strategy, wind farm operation information is received in real time, set power values of wind farm units and reactive-load compensation devices are sent to the corresponding wind turbine generator units and the corresponding reactive-load compensation devices in a wind farm at regular intervals according to the different power control strategies, finally a closed loop for testing the control performance of a wind farm active/reactive control system is formed, and the success rate of on-site putting into operation is improved.

The invention discloses a harmonic power flow analysis method of a distributed power generation system. The method includes the steps that firstly, according to the characteristics of distributed generation (DG) connected grids in the distributed power generation system, the operating characteristics of a DG connected grid interface power electronic device and the content of all levels of harmonic currents of a DG injection system are analyzed; secondly, fundamental wave voltage of the DG connecting grids is obtained through calculation of fundamental power flow of the distributed power generation system, and all the levels of harmonic currents of the DG injection system can be worked out through output power of DGs; finally, all the levels of harmonic currents of the DG injection system are obtained through fundamental currents of the DG injection system, and the harmonic power flow distribution situation of the whole distributed power generation system is worked out. According to the method, the distribution situation of all levels of harmonic voltage of all nodes in the system can be obtained without iterative computation, the computation speed and the computation efficiency of the harmonic power flow analysis method are increased fundamentally, the problem of harmonic power flow iteration convergence is solved, and the harmonic power flow analysis method has the advantages of being clear in computational process, easy in programming and the like.

The invention discloses an alloy for producing the plate grid of lead-acid accumulator, composed of barium, tin and lead, wherein the barium weight is 0.01-0.12%, the tin weight is 0.00-3.00%, and the left is lead. The alloy also can contain 0.02-0.06% calcium. The invention further provides a relative production method. The accumulator produced by the inventive method can keep high rigidity and mechanical property in application, to resolve the stability and reliability problems of accumulator. And the tin can improve the conductivity of corrosion layer at plate grid interface. The tin at high content can improve the rigidity and rigidifying speed of alloy, prolong the service life, reduce corrosion, and improve creep resistance.

The invention discloses a pressurized water reactor containment vessel two-side condensation and evaporation coupling calculation method. The method comprises the following steps: establishing a pressurized water reactor containment vessel computational domain simplified geometric model; performing grid generation on each part in the pressurized water reactor containment vessel computational domain model to obtain a grid model of each part; setting an interface of each part in a calculation domain of the pressurized water reactor containment as a grid interface to realize splicing of grids ofeach part; performing steam condensation calculation in the range of the fluid domain grid model in the containment vessel; calculating the temperature distribution in the solid domain of the containment body structure through the heat conduction relational expression; and calculating a flow field and a temperature field of a liquid film in an external fluid domain of the containment vessel by adopting a liquid film model.

The invention discloses a two-side cooling and evaporation coupling calculation method for a liquid metal spiral tube steam generator. The method comprises the following steps: establishing a spiral tube steam generator computational domain prototype geometric model; meshing each part in the spiral tube steam generator computational domain model to obtain a mesh model of each part, and setting boundary conditions; setting an interface of each part in the spiral pipe steam generator computational domain as a grid interface to realize splicing of grids of each part; importing the physical property of the liquid metal according to a turbulence Pr number correction relational expression; carrying out reasonable initialization and boundary condition correction; and carrying out steam evaporation, lead bismuth condensation and coupled flow heat transfer calculation of a pipe wall solid region in all regions including a solid region and a grid model range of a shell side fluid region and a pipe side fluid region of the spiral pipe steam generator.

The invention discloses a display method and a mobile terminal of a grid interface. The method comprises the following steps of: displaying the grid interface after entering into a main menu of the mobile terminal; receiving and analyzing an input command for the grid interface, and determining the grid application corresponding to the command; and displaying a sub menu of the grid application in a preset area of the grid interface, wherein the preset area is one of N equivalently divided areas of the grid interface, and N is larger than 0. According to the display method and the mobile terminal of the grid interface, which are disclosed by the invention, the processing ability of a system is enhanced, and the user experience is increased.

The invention provides a method for setting up a reactive power compensation device model based on a controlled alternating current source. The method includes the following steps of measuring the voltage of an installation point of a reactive power compensation device and the voltage of a control point of the reactive power compensation device, calculating control voltage deviation, setting up the reactive power compensation device model, and conducting calculating to obtain an amplitude signal, a frequency signal and a phase angle signal of the controlled alternating current source. According to the method, by using the controlled alternating current source and a grid interface, by controlling the amplitude, the phase angle and the frequency of the current of the controlled alternating current source and particularly by keeping the phase angle of the current of the installation point 90 electrical degrees greater than the phase angle of the alternating current source, the ideal control of the output power of the reactive power compensation device is achieved. The method can be easily and extensively applied to various power generation systems which include wind turbine generators, photovoltaic power generating systems, battery energy storage systems, ocean power generating systems, micro gas turbines and the like and are connected with a power grid through power electronic equipment interfaces, and can be easily and extensively applied to novel power electronic interface new energy power generating systems which are rapidly developing and constantly emerging.

The invention relates to the semiconductor device field, discloses a GaN MISFET of high quality MIS grid structure and a manufacturing method thereof and especially relates to an improved method of a MIS interface. The device comprises a substrate, an epitaxial layer, a grid dielectric layer, a source electrode, a drain electrode and a grid electrode, wherein the epitaxial layer, the grid dielectric layer, the source electrode, the drain electrode and the grid electrode are growth on the substrate. The epitaxial layer comprises a first epitaxial growth stress buffer layer, a GaN epitaxial layer and an AIN thin layer. On the epitaxial layer, an area is selected to grow a secondary epitaxial layer and a groove channel is formed. And then, the grid dielectric layer is deposited, grid metal covers the groove channel grid dielectric layer, and two ends of the grid are covered by metal so as to form the source electrode and the drain electrode. The device structure and a manufacturing technology are simple and reliable, the MIS grid interface with high quality can be formed and performance of the GaN MISFET device is increased. The method is important for reducing a channel resistance and improving a threshold voltage stability problem.

A generator is provided comprising a rotor with a number of magnetic rotor pole shoes, a stator with a number of stator coils wound on the stator, and a generator-utility grid interface comprising a plurality of diode rectifiers, each diode rectifier is connected to a stator coil and the number of stator coils is greater than the number of rotor pole shoes, or the number M of rotor pole shoes is greater than, but not an integer multiple of, the number of stator coils. A wind turbine utilizing the generator of the present invention and a method of assembling such a generator are provided

A mapping method for heterogeneous grid interface data comprises following steps: (1) according to the transmission direction of heterogeneous grid interface data, the grid area where field data in the interface is to be updated is defined as a target area, the grid area which provides data in the interface is defined as a source area; (2) searching for assigned nodes in the target area, wherein the assigned nodes are target nodes or all nodes in the source area or unit information corresponding to units and labeling the searched nodes or units; (3) establishing the mapping relationship between nodes or units in the target area and the corresponding nodes or units in the source area; (4) mapping all the nodes or units in the target area with the corresponding nodes or units in the source area; (5) determining whether or not the established relationships are unique, if the relationships are unique, then directly turning to steps (6), or else, selecting the mapping relationship having the shortest normal distance as the final mapping relationship, and turning to step (6); (6) performing interpolation on each node or unit in the target area according to a preset interpolation method.

The invention discloses a pipeline leakage characteristic Godunov simulation method based on Brunone dynamic friction resistance. The pipeline leakage characteristic Godunov simulation method comprises the following steps: firstly, constructing a non-constant pipe flow control equation containing a Brunone dynamic friction resistance model; establishing a leakage pipeline calculation grid system according to a Godunov format of a finite volume method, and converting a control equation into a Riemannian problem; calculating the flux of a grid interface by adopting a second-order Godunov format;a boundary condition including the leakage is then processed, and a control body internal fluid variable and a control body leakage boundary fluid variable are calculated. According to the method, the problem of second-order precision of a very difficult and complex dynamic friction model in an MOC format can be solved, so that the hydraulic transient characteristics of the leakage pipeline are simulated more accurately and efficiently, and leakage detection and safe operation of a pipeline system are ensured.

The invention relates to an engineering analysis method used for in-mold decoration injection molding. The method is divided to molding engineering analysis, grid interface processing and injection engineering analysis, and comprises the following steps: first, establishing a film grid, a molding mould grid and an injection molding grid, importing the film grid and the molding mould grid, and setting a molding parameter for engineering analysis so as to obtain molding analysis information; operating according to the injection molding grid and the molding analysis information to obtain an embedded film grid and an injection resin grid; and importing the embedded film grid and the injection resin grid, and setting an injection parameter for mold flow analysis so as to obtain in-mold decoration analysis information. The engineering analysis method is integrated with a molding analysis program and an injection analysis program, improves the analysis precision of the in-mold decoration injection molding, and shortens the engineering analysis time of the in-mold decoration injection molding, thereby shortening development time of a product and reducing cost.

The invention discloses a cascaded five-level output capacitor clamping bridge type frequency converter. The cascaded five-level output capacitor clamping bridge type frequency converter comprises a plurality of five-level output frequency converter units having a same structure. Each five-level output frequency converter unit is composed of eight controllable switches having a same structure and two capacitors. Every four controllable switches are serially connected into a series circuit. Each capacitor is connected between two nodes on two sides of the center node of a series circuit. Two ends of the two series circuits after parallel connection are used as power output ends of a corresponding five-level output frequency converter unit. The center node of the first series circuit of the previous five-level output frequency converter unit is connected with the center node of the second series circuit of the next five-level output frequency converter unit. The center node of the second series circuit of the first five-level output frequency converter unit and the center node of the first series circuit of the last five-level output frequency converter unit are used as two ends of power input ends respectively. According to the invention, the advantage of easy modularization can be realized, and the frequency converter of the invention is suitable for being used in a grid interface.