14 results about "Dc field" patented technology

The invention relates to the technical field of converter stations, in particular to a back-to-back converter station arrangement type based on the SLCC technology, and a power conversion unit comprises a first valve hall and a second valve hall; a direct-current field is arranged between the first valve hall and the second valve hall, and a direct-current field middle road, a smoothing reactor and a connecting reactor are arranged in the direct-current field; an LCC valve and an SVF valve are arranged in each of the first valve hall and the second valve hall; dC wall bushings are arranged on the hall walls, close to one side of the DC field, of the first valve hall and the second valve hall, and AC wall bushings are arranged on the hall walls, away from one side of the DC field, of the first valve hall and the second valve hall; the direct-current side of the LCC valve is connected to the smoothing reactor through a direct-current wall bushing, and the wire outlet side of the SVF valve is connected to the connecting reactor through the direct-current wall bushing. Therefore, the capacity transmission requirement can be met through the characteristics of the LCC valve, the dependence on an alternating current system is reduced through the characteristics of the SVF valve, the field of a conventional direct current alternating current filter is canceled, the occupied area is reduced, installation and maintenance are convenient, and the cost is reduced.

The invention provides a land flexible direct current converter station direct current field arrangement system and an operation control method, and relates to the technical field of flexible direct current transmission, and the system comprises a bridge arm reactor, an isolation grounding switch, a direct current measuring device, a direct current voltage measuring device, a direct current lightning arrester, a wall bushing and an energy consumption device which are conventionally configured in a land converter station direct current field. The devices are connected through tubular buses and flexible conductors. According to the invention, a double-spliced direct current submarine cable scheme is adopted for high-capacity offshore wind power flexible direct current transmission, on the basis of conventional direct current field configuration, by adding three isolation grounding switches, no power failure can be realized when any two direct current submarine cables are in an outgoing line fault, and the reliability of high-capacity offshore wind power flexible direct current transmission is greatly improved.

The invention discloses an open-circuit test method and device for a direct-current power transmission system, and belongs to the technical field of power electronic transverters, and the method comprises the steps: switching a control mode of the direct-current power transmission system to a no-load pressurization test mode, switching a direct-current field switch to a no-load pressurization test state, and carrying out the open-circuit test of the direct-current power transmission system; the outer loop control in the no-load pressurization test mode is switched into the sub-module average voltage control; closing a bypass switch on the direct current side of the to-be-tested converter valve; the converter valve to be tested comprises at least one of a first converter valve and a second converter valve; closing an inlet wire switch at the alternating current side of the converter valve to be tested so as to enable the converter valve to be tested to enter a short-circuit charging state; after charging of the to-be-tested converter valve is completed, the to-be-tested converter valve is unlocked according to a first preset voltage; turning off a bypass switch on the direct current side of the converter valve to be tested; and raising the direct-current voltage of the to-be-tested converter valve according to a preset target. The system can meet the requirements of the open-circuit test of the extra-high-voltage flexible direct-current power transmission system.

The invention relates to the technical field of circuit breakers, and discloses a multifunctional direct-current circuit breaker which comprises a shell, leads arranged at the two ends of the shell, an anti-overload mechanism arranged on one side of the interior of the shell, an anti-short-circuit mechanism arranged at the bottom of the anti-overload mechanism and a tripping mechanism arranged on one side of the anti-short-circuit mechanism. The arc extinguishing mechanism is arranged on one side of the tripping mechanism; the short circuit prevention mechanism is used for preventing short circuit of the line, the overload prevention mechanism is used for preventing overload of the line, and the tripping mechanism is used for tripping when the short circuit prevention mechanism or the overload prevention mechanism is triggered to protect the circuit. Arc extinguishing efficiently adapts to a direct current scene, the arc extinguishing problem that the direct current does not have a natural zero crossing point is solved by assisting an arc striking electrode to actively pull and lengthen the arc and matching a funnel-shaped arc extinguishing grating and an accurate track alignment design, the arc is quickly segmented and extinguished, reignition is avoided, and the arc extinguishing device adapts to a high-voltage large-current scene.

Devices and methods are described for disinfection of pathogenic organisms using pulsed DC field electroporation. For example, this disclosure describes disinfection of pathogenic organisms using pulsed DC field electroporation for lung infection treatment, blood infection treatment, sterilization, and respirators.

The invention provides an offshore flexible direct current converter station direct current field arrangement system and an operation method, and relates to the technical field of offshore wind power flexible direct current transmission engineering, the offshore flexible direct current converter station direct current field arrangement system comprises two direct current fields, the two direct current fields are symmetrically arranged, one direct current field is provided with a positive pole three-phase bridge arm reactor, and the other direct current field is provided with a negative pole three-phase bridge arm reactor; the six bridge arm reactors are symmetrically arranged in an ABCABC mode, incoming lines of the bridge arm reactors are all connected with direct-current wall bushings, outgoing lines of the bridge arm reactors are all connected with a busbar type bus in parallel, and the busbar type bus is sequentially connected with a direct-current voltage measuring device, a horizontal telescopic direct-current isolating switch, a vertical telescopic direct-current isolating switch, a direct-current measuring device and a lightning arrester. And finally, the direct-current cable terminal is connected with a direct-current cable. According to the invention, the wall bushing is arranged between the positive direct current field and the negative direct current field, and the direct current isolation switch is reasonably arranged, so that no power failure during fault maintenance of any one or two submarine cables can be realized on the premise of not additionally increasing the size of the direct current field, and the operation reliability of an offshore converter station can be improved.

The present application relates to the technical field of charging pile control, in particular to a charging control method and control system of three AC-DC hybrid piles. The method comprises: generating a charging session request and determining a candidate charging gun; in the pre-insertion identification state, keeping the main power loop switching device open, using low-energy detection to obtain vehicle-side charging capacity information, combining gun type and pile-side resource state to form compatibility judgment, if the start condition is met, entering the formal locking state and binding the session, if not, outputting guidance information to prompt switching the charging gun; then completing the channel configuration according to the gun type and performing safety verification, in the DC scenario, pre-charging and then closing the switch to start; monitoring the operating parameters during the charging process, and disconnecting the switching device and releasing the port resources when ending or abnormally. The system comprises session management, two-stage identification and channel selection, channel configuration and safety start, monitoring and end recovery modules.

The invention relates to the technical field of black-start auxiliary excitation, in particular to a black-start auxiliary excitation circuit and a wire connecting device. The system comprises an excitation silicon controlled rectifier bridge, an alternating current magnetic field circuit breaker and a direct current magnetic field circuit breaker which are electrically connected with the excitation silicon controlled rectifier bridge, an excitation transformer electrically connected with the alternating current magnetic field circuit breaker, and a generator and an alternating current branch which are electrically connected with the excitation transformer, the device comprises an AC power switch electrically connected with the excitation silicon controlled rectifier bridge, an excitation transformer electrically connected with the AC power switch, a first diode rectifier bridge electrically connected with the excitation transformer, and an auxiliary excitation control switch electrically connected with the first diode rectifier bridge. According to the black-start auxiliary excitation circuit, the problem that a conventional direct-current power supply cannot be adopted for auxiliary excitation in the excitation black-start process of a large generator set is solved, and the installation and maintenance efficiency of the black-start auxiliary excitation circuit is improved.

This invention discloses a demonstration tool and method for ion trapping and quadrupole mass spectrometry principles. A segmented trap assembly is fixedly mounted on a base, and a sample preparation component for storing sample particles is inserted within the segmented trap assembly. One end of the sample preparation component is connected to a gas pump. The segmented trap assembly includes four segmented rods arranged in a cross shape, each with a corresponding radio frequency electric field and DC field applied. The sample preparation component is located between the four segmented rods and is equidistant from them. Each segmented rod includes a radio frequency electrode, with a first cap electrode and a second cap electrode fixedly connected to its two ends. One end of the radio frequency electrode is electrically connected to a radio frequency electrode fixedly mounted on the first cap electrode. This invention can be used to demonstrate both the trapping principle of an ion trap and the mass selection principle of a quadrupole mass spectrometer. It has advantages such as high feasibility, simple operation, and low manufacturing cost, thus making it possible to conduct more widespread teaching demonstration experiments.

The application discloses a method for establishing and confirming a target loop of multi-terminal parallel DC engineering metal ground conversion, and specifically comprises the following steps: after a metal ground conversion command is issued, a parallel target loop is established by operating a DC field switch breaker; DC field data is acquired; firstly, the position of the DC field switch breaker is judged; if the condition is not met, it is confirmed that the target loop establishment fails; if the condition is met, the current of the target loop is continuously judged; if the condition is met, it is confirmed that the target loop establishment succeeds; if the condition is not met, the initial loop conversion switch is separated, and the current of the target loop is judged again; if the condition is met, it is confirmed that the target loop establishment succeeds; if the condition is not met, the initial loop switch is closed, and it is confirmed that the target loop establishment fails. The method can effectively overcome the defects of the prior art, has the advantages of simple and convenient process, no need for complex calculation, no need for power / current level adjustment, no need for dependence on inter-station communication, and the like, can be popularized to more terminals, effectively guarantees the safety of a power grid, and brings practical economic benefits.

An ion mobility analyser is disclosed having a gas flow directed along the ion travel axis and a set of electrodes to which DC voltages are applied to establish a DC field. The opposing forces of the gas flow and DC field cause ions to be trapped within a separation region in axial regions determined by their ion mobilities. A gas recirculator, having inlet and outlet ends respectively located downstream and upstream of the separation region, supplies at least fifty percent of the gas flow within the separation region, thereby reducing vacuum pumping requirements.

The application discloses a kind of offshore wind power DC grid-connected converter station, including AC field, converter valve hall, bridge arm reactor and starting area, DC circuit breaker and energy consumption valve hall and DC field, AC field, converter valve hall, bridge arm reactor and starting area, DC circuit breaker and energy consumption valve hall and DC field are sequentially connected to make submarine cable by AC field access to the DC field DC transmission line transmission.The application can not need to set offshore converter station, offshore wind power AC power collection line is directly landed and converted into DC by converter station, and is accessed into DC power grid by DC line.

The invention discloses a multi-physics field calculation method for an offshore flexible direct current conversion platform and a related device, and relates to the technical field of high-voltage direct current transmission. The converter platform is divided into a valve hall, an alternating-current field hall, a direct-current field hall and a GIS equipment room according to functions, three-level calculation levels of equipment, a cabin and a platform are set, equipment-level, cabin-level and platform-level multi-physical field simulation is carried out in sequence, the simulation result of the previous level serves as the excitation condition of the next level, step-by-step geometric simplified modeling is combined, and the simulation result of the next level serves as the excitation condition of the next level. And cross-scale electricity-magnetism-heat-force multi-physics field coupling analysis is realized. The problems that in the prior art, due to the fact that the model scale is too large, full-platform simulation is not feasible, and key coupling variables are difficult to identify are solved, the simulation efficiency and precision are remarkably improved, and multi-physics field equilibrium optimization design in a compact space is supported.

The invention belongs to the technical field of offshore wind power optimization layout, and particularly relates to an offshore flexible direct current conversion platform direct current field. The problem that a traditional open type arrangement is too large in occupied area is solved. The marine flexible direct current conversion platform direct current field comprises electrical units corresponding to a direct current positive electrode and a direct current negative electrode, and each unit comprises a plurality of bridge arm reactors, a gas-insulated switch module and a gas-insulated closed confluence conductor. Wherein the output ends of the plurality of bridge arm reactors are connected to the closed confluence conductor; and the closed confluence conductor is spatially arranged above the switch module and is electrically connected with the switch module through a gas insulation connecting structure to jointly form a totally-closed gas insulation high-voltage conductive path from the output end of the electric reactor to the wire outlet end of the direct-current field. According to the invention, totally-enclosed gas insulation equipment and vertical three-dimensional layout are adopted, so that the plane size of a direct-current field is reduced, and the insulation reliability and corrosion resistance of the device in a severe ocean environment are improved.