213results about How to "Reduce load loss" patented technology

The invention provides a dual channel charging method, a system and a terminal thereof. In the method, when a processor receives a current wired charging state and a current wireless charging state, according to a charging current allowed by a current cell and a Joule law, currents needed by wired and wireless dual channels are calculated respectively, charging current and charging voltage configurations are performed on a first power supply management chip and a second power supply management chip respectively so that the first power supply management chip and the second power supply management chip charge the cell based on the configurations. In embodiments of the invention, two completely isolated charging channels are used, which are one wired charging channel and one wireless charging channel; under the condition that wired and wireless charging are simultaneously performed, simultaneously, a whole charging process is ensured to be safe; a load loss of each charging channel is reduced and charging heating is reduced so that purposes of increasing charging efficiency, shortening charging time and increasing a user experience are reached.

The invention relates to an isolated grid operation stabilization control method based on a delivery manner of a regional weak tie power grid. The method is a dynamic simulation analyzing method based on tracks. According to a searching-verifying method and combining the voltage and frequency change tracks, the operating characteristics of the power grid under the condition of various delivery power are analyzed, the factors of the unit grid interfering protection of the regional power grid, the operating state change of the power grid, the over-speed protection of a generator unit, the high-week machine cutting measures of the regional power grid, linked machine cutting, low-frequency load decrease and the like are comprehensively considered, an isolated grid operation stabilization control strategy which is suitable for the delivery regional power grid for the requirements of the actual power grid is developed, and the second defense line and the third defense line of the regional power grid, and the over-speed protection allocation scheme of a generator are coordinated and optimized. Through the adoption of the stabilization control method, the isolated grid operation stabilization of the regional power grid can be ensured, the load loss can be reduced, the adaptability is better, the considered factors are more comprehensive, the certain practical value can be generated, and the promoted prospect is better.

The invention belongs to the power transmission and transformation equipment field and relates to an energy-saving box type outdoor substation. The substation comprises a top cover and a box body; the box body is divided into a high-voltage chamber, a transformer chamber and a low-voltage chamber. The energy-saving box type outdoor substation further comprise an intelligent controller; the intelligent controller is connected with a low-voltage chamber power transmission line through a power source input cable; the high-voltage chamber is provided with a high-voltage entering cabinet, a high-voltage metering cabinet, a high-voltage ring main unit and a high-voltage outgoing cabinet; the low-voltage chamber is provided with a low-voltage entering cabinet, a high-voltage reactive power automatic compensation capacitor cabinet and a low-voltage outgoing cabinet; and a transformer arranged in the transformer chamber is an on-load automatic capacitance adjustment power distribution transformer. The energy-saving box type outdoor substation is safe, reliable, energy-saving and efficient. With the energy-saving box type outdoor substation adopted, a power factor as well as the power supply efficiency and voltage quality of a system can be improved, and line loss can be decreased, and distribution line cost can be decreased, and electric energy can be saved, and the occupancy of a power grid and the no-load reactive loss and active loss of the transformer can be decreased, and capacity increasing cost and operation cost can be saved, and saving energy and consumption reduction can be realized, and great economic benefits and social benefits can be brought about.

The invention discloses a demand side response-based microgrid optimal unit and time-of-use electricity price optimization method, which comprises the following steps: (1) acquiring supply and demandhistorical data of a microgrid, including internal load data of the microgrid, a supply situation of distributed regenerable energy and basic information of all types of energy supply units; (2) analyzing outputs of all energy supply systems by using the historical data so as to analyze a supply and demand situation in the microgrid; (3) setting an optimized target function subjected to distributed optimization; (4) performing optimized solving by using a particle swarm search algorithm and an interior point method. According to the demand side response-based microgrid optimal unit and time-of-use electricity price optimization method disclosed by the invention, the supply situation of the regenerable energy of the microgrid and a demand side response under the excitation of time-of-use electricity price are organically combined, and an optimal unit combination of the microgrid and a time-of-use electricity price strategy are subjected to the distributed optimization through the particle swarm search algorithm and the interior point method, so that the problems of extremely high operation cost of the microgrid and too large lack of internal loads are effectively relieved, and the electricity use demand of a user can be well met.

The invention relates to a power supply recovery method of a power distribution network comprising distributed power supplies after a fault. The power supply recovery method is technically characterized by comprising the following steps of (1) splitting the distributed power supply which does not have isolated island operation capability after a large-area power failure condition is caused by the fault of the power distribution network; (2) carrying out isolated island division by using a searching method on the basis of the principle that the distributed power supplies run with surrounding loads, and then enabling an isolated land, with the surrounding load, of the distributed power supply with the isolated island operation capability to run; (3) isolating a fault point and recovering power supply of the remaining sound network; and (4) enabling the distributed power supply or isolated island with a grid-connection condition to run in a grid-connection manner and enabling the isolated land without the grid-connection condition to further run. The effects of the distributed power supplies can be fully developed under the premise of recovering load power supply as much as possible; the important load power supply reliability is improved; meanwhile, the switching action frequency is reduced as few as possible in the power supply recovery process; and the network loss is reduced as much as possible after power supply recovery.

The invention discloses a video stream seamless switching method and device, and belongs to the technical field of real-time streaming media processing. The method includes the steps: performing switching preparation and an opening operation of a corresponding new video stream according to a switching request of a new video stream during the playing of an old video stream, wherein the switching preparation includes the steps: determining a switching condition of the new video stream; continuously obtaining the play related data of the old video stream and the new video stream after the new video stream is opened; resetting a decoder to obtain the media data of the new video stream; and performing the seamlessly switching at the corresponding switching time point of the new video stream. The method realizes more smooth and seamless switching. Compared with a conventional code stream cutting scheme, the method greatly improves the playing experience of a user, and is good in applicationprospect.

The invention discloses a contactless on-load automatic positive and negative voltage regulating tap switch device for a three-phase distribution transformer and relates to the technical field of electric engineering. The problems that the contactless on-load voltage regulating range is small and power supply reliability is poor due to the fact that an existing power electronic element is low in voltage resistance can be solved. An antiparallel thyristor is used as a switching tap switch device, on-load voltage regulation is carried out in a positive and negative voltage regulation mode, a low-voltage air switch is used as a circulating current protecting device, and on-off of the tap switch is controlled through a monitoring and control system and a trigger unit. When the tap switch breaks down, an air switch trips out, a fault current is cut off, meanwhile, a power source of an isolation transformer is cut off, the on-load voltage regulating function exits, and the distribution transformer is automatically recovered to a rated tap to continue to supply power to a user; meanwhile, a fault alarm unit automatically sends a short message to a transformer manager through a mobile communication network to inform the transformer manager that the on-load automatic positive and negative voltage regulating tap switch is in the abnormal operation stage, and therefore fault removal is carried out at the right moment. The contactless on-load automatic positive and negative voltage regulating tap switch device is used for a power distribution system.

The invention discloses a pneumoelectric integrated energy system distribution network optimization method considering pneumoelectric joint demand response, and the method comprises the steps: establishing a pneumoelectric integrated energy system distribution network optimization operation model through employing the minimization of the operation cost of a distribution network system as a targetand combining with a set related operation constraint; aiming at the nonlinear alternating-current power flow equation constraint of the power distribution network, adopting a second-order cone relaxation method for processing; aiming at a nonlinear Weymuth power flow equation of the gas distribution network, proposing an enhanced second-order cone relaxation method of adding a gas pressure penalty term into a target function to further tighten a relaxed constraint condition, and converting a non-convex optimization problem into a convex optimization problem to be solved, so that relatively high relaxation precision is achieved. On the basis of a distribution network optimization scheduling model, an operation strategy for improving the new energy consumption capability and the operation economy of a distribution network system by utilizing gas-electricity joint demand response is provided.

A mining explosion-proof all-insulation dry type transformer with an amorphous alloy iron core for a mobile transformer substation comprises an integral winding, the iron core, an upper clamp, a lower clamp and a shell, wherein the integral winding includes low-voltage coils and high-voltage coils. The mining explosion-proof all-insulation dry type transformer is characterized in that insulation layers are arranged among layers of the low-voltage coils, the high-voltage coils are arranged on the outer layer of the low-voltage coils, each insulation layer is arranged between each two adjacent layers of the high-voltage coils, an outer insulation layer covers the high-voltage coil, and the integral winding has the square section. The iron core is the amorphous alloy iron core, and an assembling lap joint of the iron core is arranged on the lower portion. The upper clamp and the lower clamp are non-metallic parts cast by epoxy resin and reinforced by filled glass fibers, the U-shaped sections of the upper clamp and the lower clamp cap the upper yoke and the lower yoke to press the upper end face and the lower end face of the winding and are fastened by pull bolts, and the pull bolts are symmetrically mounted on the low-voltage side and the high-voltage side to fasten the upper clamp and the lower clamp. The mining explosion-proof all-insulation dry type transformer has the advantages of long service life, low loss, low noise, no maintenance or pollution, high reliability, flame retardance, fire resistance, recyclability after being used up and the like.

The invention provides a multi-time scale generation right transaction method for promoting wind power consumption. The method comprises the following steps of 1, based on a long-term forward contract and day-ahead wind power forecast, performing day-ahead generation right transaction, determining a day-ahead generation right of each generation company, and locking the start-up and shut-down state of a large-scale thermal power generating unit; 2, based on a day-ahead generation right transaction result and a wind power forecast result updated 4h ago, performing 4h-ago generation right transaction, determining a generation right of each generation company, and adjusting the start-up and shut-down state of a rapid start and stop unit; and 3, based on a 4h-ago generation right transaction result and a 1h-ago wind power forecast result, performing 1h-ago generation right transaction and determining a final generation right of each generation company and the operation mode of an electric power system. The invention can promote the wind power consumption, improve the income of a wind power plant, and reduce the system production cost and risks of load losing or wind power abandoning during operation of an electric power system.

An intake manifold (2) of comburent air is provided for an internal combustion engine (1) with a recirculating conduit (60) of exhaust gases. The intake manifold (2) includes a first inlet mouth (213) of the comburent air, a second inlet mouth (214) in communication with the recirculating conduit (60) of the exhaust gases, and a plurality of outlet mouths (201), having a wall (7) positioned in front of each of the outlet mouths (201) and suitable for dividing the internal volume of the intake manifold (2) into two chambers (215, 204), the first chamber (215) being placed in communication with the first inlet mouth (213) and the second inlet mouth (214) and the second chamber (204) being placed in communication with the outlet mouths (201), the wall (7) defining an opening (70) suitable for placing the first chamber (215) and the second chamber (204) in communication.

The invention discloses a multi-energy park day-ahead economic dispatching method by considering demand response and containing electric vehicles. The method comprises the following steps: firstly, modeling each device in the park according to the determined specific composition of the multi-energy park; then introducing the electric vehicle while considering the demand response; taking the minimum total operating cost of the park as an objective function; considering related constraint conditions; combining a Monte Carlo scene theory; constructing a multi-energy park day-ahead economic dispatch random model by considering the uncertainty of wind power output and photovoltaic output, verifying the contribution advantages of demand response and electric vehicles to multi-energy park economic operation and new energy consumption, and obtaining a multi-energy park day-ahead economic dispatch strategy containing the electric vehicles and by considering the demand response. A demand response mechanism and an electric vehicle are introduced to further improve the new energy consumption capability of the park and enhance the operation economy of the multi-energy park.

The invention includes at least a primary winding and a secondary winding, where the primary winding are separated into several segments by several taps, including even series-parallel segments as well as several tap segments, the series-parallel switches are led through cables to series-parallel switches, and the tap segments are led through cables to tap switches, it adjusts the series-parallel switches to connect in series or parallel with each series-parallel segment so as to implement voltage conversion and adjusts the tap switches to cut off or connect parts of the tap segments so as to achieve the purpose of increasing/decreasing number of turns and then implement fine voltage adjustment, thus making the turn voltage and output voltage constant as a transformer operates at high and low voltages. Its output voltage is stable, its operation is reliable, its resistance is low, it makes full use of number of winding turns, its road loss is low and it has the characters of small bulk, operating convenience and so on.

The invention provides a comprehensive energy-saving and noise-reduction multi-target optimal design method for a power transformer. The method is characterized by comprising the following steps: step 1, building a preliminary optimal model for energy conservation and noise reduction of the power transformer and obtaining a preliminary optimal design scheme; step 2, building a computation model for computing the loss and noise of the power transformer and obtaining preliminarily optimized energy-saving and noise-reduction benefits; step 3, building a comprehensive energy-saving and noise-reduction multi-target optimal design model of the power transformer; and step 4, adopting the nonlinear weighting synthetic method to solve and obtain a final scheme for comprehensive multi-target optimal design. The power transformer adopting the comprehensive energy-saving and noise-reduction multi-target optimal design method has the advantages of energy conservation, noise interference reduction, lower cost, no-load loss reduction, load loss reduction, high efficiency, simplicity and convenience in production and manufacture, strong practicability and the like.

A heat exchanger of the single circuit type, to be coupled to a fluid circulation circuit and comprising: an upper tubular head element and a lower tubular head element horizontally arranged and which are each provided with a nozzle and through slots provided in an inner longitudinal wall portion; and a plurality of vertically disposed fluid conduction tubes, each internally defining a plurality of longitudinal microchannels. The opposite ends of the fluid conduction tubes are affixed to the inner longitudinal wall portion of the upper tubular head element and lower tubular head element, respectively, so as to communicate the ends of the microchannels of each tube with a through slot of the respective tubular head element and, thus, the fluid conduction tubes with the interior of the upper tubular head element and lower tubular head element.

A hybrid vehicle implements a required traveling condition by generating a required driving force necessary to drive the vehicle even in the case where a supply source of a working fluid develops a malfunction. The hybrid vehicle is equipped with a motor which changes the phase difference between two rotors and an engaging/disengaging device which turns on/off the supply of a driving force of an internal combustion engine, the motor and the engaging/disengaging device being driven by a working fluid. The hybrid vehicle further includes a clutch which carries out the engagement/disengagement between a first drive shaft through which a driving force of an engine is transmitted and a second drive shaft through which a driving force of the motor is transmitted to wheels, an electrically-operated first pump capable of supplying hydraulic oil to a relative rotational force generator of the motor and the clutch, a mechanical second pump which is driven by the engine and which is capable of supplying the hydraulic oil to the clutch, and a solenoid selector valve for selectively switching the source of supply of the hydraulic oil to the clutch to the first pump or the second pump.

The invention concerns a hand-held vacuum (1) comprising: a main body comprising a gripping handle and a main air suction conduit (6); a suction means (7) generating a flow of air through the main air suction conduit (6); a cyclonic dust separation device (4) having one or two stages, aeraulically connected to the main suction conduit (6); a secondary air discharge conduit (8) comprising an external outlet (9); characterized in that the secondary air discharge conduit (8) comprises at least one passage (10) in which said secondary conduit (8) forms a bend (11) at an angle of between 120 degrees and 200 degrees and preferably 180 degrees along a trajectory axis (A).

The invention discloses a transformer with a grade-insulation structure, and the transformer comprise a low-voltage coil, a high-voltage coil, a shielding electrode, a grade-insulation structure and an iron core, wherein the low-voltage coil and the high-voltage coil are respectively arranged at the inner side and outer side of the grade-insulation structure, the iron core arranged at the inner side of the low-voltage coil is provided with a radiating folding screen, and a shield is arranged at the outlet electrode of the high-voltage coil to form the shielding electrode; and the grade-insulation structure comprises a first insulation layer, a second insulation layer, a third insulation layer, an angle ring, a fourth insulation layer, a fifth insulation layer and a sixth insulation layer which are arranged from inside to outside, and the angle ring stretches out of the low-voltage coil and the high-voltage coil. The transformer with the grade-insulation structure has the advantages that the material cost and energy consumption of the transformer are greatly reduced, the reliability of the product is improved, and the service life is prolonged.

A fluid cooling device for the propulsion unit of a propfan type aircraft including a compressed air intake at the air compressor of the turbomachine, an air vein capable of conveying the collected compressed air to a cooler, and a system for conveying the heat of the lubricant to the cooler is provided. The cooler includes a matrix body provided with a plurality of ducts for a cooling agent, the ducts extending along a first inner surface up to a second outer surface of the matrix body such that the collected pressurized air serving as a cooling agent can pass through the matrix body, the matrix body of the cooler forming a portion of the outer skin of the propulsion unit; and a set of fins extending from the outer surface towards the outside of the propulsion unit, and oriented mainly parallel to the air flow direction when the aircraft is in flight.

The invention discloses a self-locking device and a self-locking type pre-stress anchor wire having the same. The self-locking device comprises a load bearing steel plate and a limiting steel plate, wherein the load bearing steel plate is a cylinder which is provided with a plurality of conical anchor holes; the anchor holes have a same diameter, are used for locking the anchor wire and for the anchor wire passing through and are symmetrically distributed; the anchor holes have gradually contracted conical degrees in the direction opposite to a stretching direction of the anchor wire; a clamping piece which is used for clamping the anchor wire and is matched with the anchor holes structure is arranged in the anchor holes; the limiting steel plate is of a round plate shape and is fixed on one side of the load bearing steel plate close to a big opening of the conical holes by a bolt; and a round hole which allows the anchor wire to pass through is arranged in the limiting steel plate. Based on a normal anchor wire structure, the anchor wire is locked by arranging the self-clocking device on a free section, the energy field of the free section is fully utilized and the anchor stress field distribution is improved, thereby, the self-locking type pre-stress anchor wire has the advantages of uniform load distribution, decreased counter-force structure scale, convenient construction, saved manufacturing cost, environmental protection, and the like.