65results about How to "Self loss is small" patented technology

The energy feedback type AC/DC electronic load simulator consists of two stages of PWM inverters with common DC bus as key parts. The input PWM inverter stage is connected through input filter inductor to the tested power source to constitute the load characteristic simulating part of electronic load; the output PWM inverter stage is connected through the isolating transformer and output filter inductor to the power network to constitute the energy feedback part of electronic load; and the load characteristic simulating part and the energy feedback part are independently controlled. The load characteristic simulating has single instantaneous current value control mode controlling the input load current amplitude and waveform, and the energy feedback has current and voltage double closed-loop control mode including phase lock loop to control the current waveform in the output network side and the bus voltage in the DC side. The present invention has small loss and high network side power factor.

The invention relates to a dynamic loss reduction method for a distribution network and a synthesized loss reduction system of a distribution network. A principle that an electric field and a magnetic field are mutually symbiotic and affected is applied for dynamically realizing electromagnetic balance; the treatment of'peak load shifting'is carried out on the current difference value between three-phase unbalanced currents caused by the dynamic unbalance of the power used by a three-phase load at the secondary side of a distribution transformer so as to lead the current difference value to approach balance, reduce a zero sequence current and the unbalance degree of the three phases, and restrain a harmonic, thereby realizing the self loss (loss on transmission) of the distribution transformer and the line loss (the copper loss of the line) at the first side and the secondary side of the distribution transformer; the synthesized loss reduction system of the distribution network realizes the synthesized loss reduction management of the distribution network, the loss on transmission of the distribution transformer as well as the automatic measuring and accounting on the data of the copper loss of the line at the first side and the secondary side thereof; the system also realizes the remote automatic collection on the power data of the distribution transformer in the same time as well as the accounting of the line loss of a distribution line, calculates and accounts the line loss of the distribution network, calculates and analyzes the loss reduction as well as analyzes the benefits of energy saving and emission reduction.

A distributed new energy power generation system and a distrusted mixed maximum power tracking method. Output ends of a plurality of serially connected new energy power generation devices (1011, 1012, …, 101n) form a high-voltage direct-current bus bar. A DC-DC converter (102) and a backend integrated converter (103) separately perform MPPT on an output power of each new energy power generation device (1011, 1012, …, 101n) and an output power of a whole new energy power generation system. A difference current of the new energy power generation device (1011, 1012, …, 101n) is delivered to the DC-DC converter (102), and the output voltage is adjusted by using the DC-DC converter (102), so that this part of energy is merged into the direct-current bus bar and jointed delivered to the integrated converter (103), and by means of the collaboration of two MPPT functions, the whole new energy power generation system outputs a maximum power.

The invention belongs to the field of luminescent materials, and relates to a rare earth metal organic framework material and a synthesis method thereof. The rare earth metal organic framework material is constructed with deprotoned 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine as ligands, with rare earth metal ions as luminescent centers by pi-pi interaction of the ligands or C-H-pi interaction of the ligands and a solvent. The distance between the centers of aromatic rings corresponding to the pi-pi interaction of the ligands is 5 Angstroms, the interaction of the ligand molecules is enhanced,the rigidity of a material skeleton is increased, the loss of energy on the skeleton is reduced, the energy transfer from the ligands to the rare earth metals is also enhanced, the energy utilizationefficiency is greatly enhanced, and thus high quantum yield is obtained. The luminescent metal organic frame material has high energy utilization rate, and the quantum yield of the luminescent metal organic frame material is increased from less than 60% to 99.9% compared with that of a conventional rare earth metal organic frame material.

The invention relates to a novel intelligent dynamic hybrid reactive power compensation device. The novel intelligent dynamic hybrid reactive power compensation device comprises an SVG unit (2) and an SVC unit (3). A main circuit breaker (2.15), an isolation transformer (2.8), a first contactor (2.16), a second contactor (2.7), pre-charging resistors (2.6), reactors (2.5), discharging resistors (2.17) and filter capacitors (2.4) are arranged on the front side of the SVG unit (2). A main control panel (2.14), sampling Halls (2.13), adapter plates (2.12), IGBT modules (2.11), absorption capacitors (2.10) and a lamination bus bar (2.9) are arranged on the rear side of a SVG cabinet (2.3). The SVC unit (3) is composed of a fuse (3.1), a thyristor (3.2), an independent-compensation capacitor (3.3) and a joint-compensation capacitor (3.4). By means of the novel intelligent dynamic hybrid reactive power compensation device, the small-capacity SVG and the large-capacity SVC are combined and controlled to run in a coordinative mode, and the rapid characteristic of the SVG and the steady-state performance of the SVC are brought into full play.

The invention provides an automatic dust removing device for a cooler for a forced oil circulation power transformer and a dust removing method of the automatic dust removing device for the cooler for the forced oil circulation power transformer and belongs to the field of automatic dust removing equipment for coolers for forced oil circulation power transformers. The automatic dust removing device for the cooler for the forced oil circulation power transformer comprises the forced oil circulation power transformer and the cooler for the forced oil circulation power transformer and is provided with a controller, a phase changing device, a voltage transformer and a current transformer. The signal output end of the controller is connected to the signal input end of the phase changing device, the three-phase input end of the phase changing device is connected to the low-voltage wire outlet end of the forced oil circulation power transformer through the voltage transformer and the current transformer respectively, the cooler for the forced oil circulation power transformer is provided with a fan driven by a motor, and the three-phase output end of the phase changing device is connected to the power source input end of the motor. Dust and sundries on a fin tube of the cooler for the forced oil circulation power transformer can be effectively cleaned, the heat dissipation efficiency of the cooler for the forced oil circulation power transformer is improved, the maintenance workload is relieved, the operation temperature of the power transformer is reduced, and the expected service life of the power transformer is achieved.

The invention relates to a method for implementing a dual-switch grid-control TWT (Traveling Wave Tube) modulator with high pulse repetition frequency and low power consumption on the basis of a MOS (Metal Oxide Semiconductor) tube. In a conventional dual-switch grid-control modulator circuit, the high inverse-voltage MOS tube with good high frequency switching characteristic is used as a switching device, so that a modulator has good pulse front edge when a narrow pulse is output; a conventional mode of forming an oppositely-pulling state by short-time direct connection of start and end switching tubes so as to reduce time of a grid-modulated pulse back edge is changed and the loss on the switching tubes of the modulator is greatly reduced, so that the modulator can stably and reliably work under the extremely high repetition frequency; the single high inverse-voltage MOS tube is basically suitable for the voltage withstanding requirement and a voltage equalizing circuit and an isolating driving circuit are saved so that a circuit is simplified; and a TWT protection circuit is arranged so as to prevent a positive bias from being always added on a TWT grid when the start switching tube is broken down. The invention provides an effective technological approach for implementing the grid-control modulator with high performance and low power consumption and developing a grid-control TWT transmitter with high pulse repetition frequency.

The invention discloses a monocrystal half-piece photovoltaic module string arrangement mode, comprising the following steps of A, cutting a whole battery piece into half battery pieces; B, enabling Nhalf battery pieces to be connected in series and welded into a single string based on consistent chamfer angle direction; C, after the half battery pieces are connected in series and welded into single strings, enabling the battery strings to be arranged on glass paved with an adhesive film based on consistent chamfer angle direction for arrangement; D, after arrangement is completed, enabling the single strings to be connected in series by busbars into an integrated body; E, in serial connection, enabling the tail parts 1 and 2 strings to be connected in series, 3 and 4 strings to be connected in series and 5 and 6 strings to be connected in series, and enabling the head part 1 string to be connected singly, 2 and 3 strings to be connected in series, 4 and 5 strings to be connected in series and 6 string to be connected singly; and F, after string connection is completed, adding an adhesive film and an insulation cushion strip between the upper and lower busbars on the head part insequence, and then paving a back surface adhesive film, a back plate or back surface glass in sequence, and gluing a glass surface bar code and the like to complete a stacking operation. The half battery pieces are consistent in chamfer angle arrangement direction, so that the attractive degree of the module is improved.

The invention discloses an LED driving circuit which is connected with a thyristor dimmer and which comprises a rectifying circuit, a bleeder circuit connected with the rectifying circuit, an LED constant-current control circuit, a thyristor turn-on FIRE voltage detecting circuit, a thyristor cut wave angle detecting circuit and a bleeder current control circuit. The thyristor cut wave angle detecting circuit generates a first result signal. The thyristor turn-on FIRE voltage detecting circuit generates a second result signal. The bleeder current control circuit, when receiving the first result signal and the second result signal, instructs the bleeder circuit to start a high-efficiency mode in which the bleeder circuit is started by delaying the start time of following preset N half-wavecycles of a DC bus voltage signal Vin with a preset time Tdelay, wherein N is a positive integer. The LED driving circuit can reduce its own loss, improve the driving efficiency of the thyristor, reduce the cost, and saves power in the high-efficiency mode.

The invention discloses a large-gradient drilling and tunneling machine which is provided with a cutting part, a shovel plate part and a walking part, wherein the cutting part comprises a cutting support and a cutting head mounted on the cutting support; the shovel plate part comprises a shovel plate body, and the shovel plate body comprises a main shovel plate and side shovel plates positioned on the two sides of the main shovel plate; a chute is formed in the middle-rear part of the main shovel plate, and star wheels are mounted on the side shovel plates; the walking part comprises a walking frame, a tensioning wheel, a driving wheel, a track assembly and a landing leg component, and the landing leg component is mounted on the side wall of the walking frame and can be inserted into the ground; shovel plate telescoping mechanisms which can extend to the outer sides of the side shovel plates are arranged below the side shovel plates of the shovel plate part. In the large-gradient environment, the large-gradient drilling and tunneling machine cannot slip down during tunneling operation, and fallen coal seams or ores during cutting are cleanly and thoroughly cleared up. In addition, the large-gradient drilling and tunneling machine is not influenced by the hardness of roadway rock during tunneling operation and is high in tunneling efficiency and small in equipment loss.

The invention discloses an auxiliary filtering cabinet. The auxiliary filtering cabinet comprises N reactors, N capacitors, a cabinet body and a cabinet door, wherein the cabinet door and the cabinet body are connected to form a cavity which is used for containing the N reactors and the N capacitors, the N is a natural number which is larger than one, the cabinet body comprises N-1 separating plates, and the cavity is divided into N sub-cavities by the separating plates, and each reactor and each capacitor are installed in each sub-cavity. When the auxiliary filtering cabinet is adopted, the size of the auxiliary filtering cabinet can be reduced, and stability and reliability of the auxiliary filtering cabinet are improved.

The invention provides an electromagnetically driven braided fabric pulling device. The device comprises a casing, a drive module and a lifting module, wherein the drive module and the lifting moduleare connected onto the casing, the drive module is connected with the lifting module through a push-pull rod, the drive module changes current through an electromagnet to produce position change in apermanent magnet group to drive the push-pull rod to move up and down, so that a slide rail in the lifting module to move up and down, the upper end of the slide rail is connected with a needle claw,and the needle claw moves to complete pulling. The provided electromagnetically driven braided fabric pulling device is simple and flexible due to a modular design structure, can pull any position ofbraided fabric and can accurately control and adjust pulling force.

The invention relates to a phase-change switch for a three-phase unbalance treatment device and a phase-change method thereof. The phase-change switch comprises a phase-change switch shell and a three-phase thyristor valve-AC contactor parallel structure and a trigger board encapsulated in the shell; and the thyristor valve-AC contactor parallel structure is connected with a current transformer. The phase-change method comprises the following steps: keeping the phase-change switch in a working phase, wherein the AC contactor in the working phase is closed and the thyristor is latched; the AC contactor in a non-working phase is in a break-brake state and the thyristor is latched; and when the three-phase unbalance of a power system exceeds the national standard, switching the phase-change switch to a low load phase. The technical scheme provided by the invention adopts a mode that the contactor is used in parallel with the thyristor, and combines the characteristics that the running power consumption of the contactor is small and the switching speed of the thyristor is fast, so that the phase-change switch of the three-phase unbalance treatment device has both the advantages of the AC contactor and a power electronic fling-cut switch, thus there is no power outage in the phase change process and no impact on the system at the same time.

A double-efficiency fuzzy optimization control method for a doubly-fed wind generator is characterized in that after the wind generator is combined to a grid and before the wind generator reaches an allowed highest rotation speed, maximum wind energy tracing and controlling are adopted to control the wind generator, in the process of the maximum wind energy tracing and controlling, a control mode is switched to optimal idle work searching control at a proper moment, and accordingly double-optimization on the operation efficiency of the generator is achieved. The double-efficiency fuzzy optimization control method has the advantages that in the process of the maximum wind energy tracing and controlling, searching accuracy of a fuzzy reasoning rule list can be improved through changes of quantization factors of input variables of the fuzzy reasoning rule list, occurrence of adjusting dead bands is avoided, and a use ratio of wind energy by the wind generator is improved. In the process of optimal idle work tracing, vibration can be effectively restrained, the searching accuracy is improved, loss of the wind generator is reduced, and active output is improved.

Disclosed is an automatic switching device for intelligently controlling multiple transformers. The automatic switching device is applicable to power supply networks of large and medium factories, capacity of a controlled system is preset to be 10MW, and primary side voltage of the transformers is 10kV. A chip 80C51, developed and produced by Intel Company, in a single chip microcomputer in a MSC-51 series is selected for a control unit of the automatic switching device, and novel setting of hardware, a clock program and a keyboard program is adopted.

The invention discloses a series photovoltaic optimization system and a control method thereof. The input end of each series photovoltaic optimizer is connected with the output of a corresponding photovoltaic panel in parallel, the output end of each series photovoltaic optimizer is connected with the output end of the corresponding photovoltaic panel in series, and the series photovoltaic optimizers enable each photovoltaic panel to realize the maximum power output through a mode of converting the unmatched energy from parallel connection into series connection, thereby effectively solving aproblem that the generating capacity of the system is reduced duo to the unmatched photovoltaic panels in a string. In addition, the series photovoltaic optimizers only convert the unmatched energy, so that the optimizers have the advantages of low power, low loss, small amount of generated heat and low cost.

The invention discloses a low-voltage large-current output transformer, which comprises a primary side winding wound on an iron core and a secondary side winding wrapped outside the primary side winding. The secondary side winding is formed by assembling a first seat body, a second seat body and a second round-tube-shaped center post. A first center post and the second center post are large in superficial areas, capable of bearing large current and heat productivity, small in self loss and capable of producing large power. The second center post can be suitable for transformers with different secondary side windings, has generality and can achieve large-batch production. The secondary side winding is divided into three independent portions including the first seat body, the second seat body and the second center post, and is convenient to manufacture and assemble. Especially, the second seat body and the second center post are small in volume and can be made of scrap edges, thereby reducing the production cost. The second center post and the first center post adopt concentrically-nested installing structures, thereby facilitating expansion of the number of the secondary side windings of the transformer.

The invention provides an adjustable reactor type voltage regulating and stabilizing device, and belongs to the technical field of power electronics. Compared with a saturation reactor type voltage regulating and stabilizing device, the adjustable reactor type voltage regulating and stabilizing device has the characteristics of precise control, large adjustment range, high repeatability precision and low loss.