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610results about How to "Improve conversion efficiency" patented technology

System and method for controlling online type photovoltaic power generation microgrid without storage device

The invention discloses a system and a method for controlling an online type photovoltaic power generation microgrid without a storage device. The system comprises a photovoltaic component, a power controller, a grid-connected inverter system, a current detection device and a reverse-power protector, the photovoltaic component is connected with the grid-connected inverter system through the power controller, output of the grid-connected inverter system and grid current are connected to simultaneously supply power to load, the power controller enables a photovoltaic power generation system to be in a variable power output state and dynamically adjusts output power of the photovoltaic power generation system according to changes of the load, the current detection device detects magnitude and phase position of the grid current as current feedback control signals of the grid-connected inverter system, and the reverse-power protector is positioned between the microgrid and an outer grid to stop the microgrid from transmitting current to the outer grid. The system is free of a storage battery energy storage system, the outer grid is only a supplement when the microgrid is in power shortage, and power transmission to the outer grid is effectively avoided, so that effects of electricity saving can be realized without upgrading power transmission networks and power distribution networks, and popularization is facilitated.
Owner:SHANGHAI JIAO TONG UNIV

Control circuit of cascade type buck-boost converter and control method thereof

The invention discloses a control circuit of a cascade buck-boost converter and a control method thereof, which belong to the technical field of power electronic converter control. The structure of the control circuit comprises an output voltage sampling circuit, two error amplifiers, a triangle wave generating circuit, a comparator circuit, a drive circuit and a voltage setting circuit; the controlled buck-boost convertor is formed by the cascade of a booster converter and a buck converter; a first control signal and a second control signal which are generated by comparing the control voltage output by the first error amplifier with triangle wave voltage control the switch tube of the booster converter through the drive circuit; the first control signal sets the control voltage output by the second error amplifier through the setting circuit; and a third control signal and a fourth control signal which are generated by comparing the control voltage output by the second error amplifier with the triangle wave voltage control the switch tube of the buck converter through the drive circuit. The invention has the advantages that the circuits are simple, only one triangle wave generating circuit is required to control two circuits, and the conversion efficiency is high.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Flexible thin film solar cell and manufacturing method thereof

InactiveCN101964398AImprove conversion efficiencyManufacturing process compatibleFinal product manufactureSolid-state devicesEngineeringThin film solar cell
The invention discloses a flexible thin film solar cell and a manufacturing method thereof, wherein the manufacturing method comprises the following steps: providing a hard support plate; forming a stripping layer on the surface of the hard support plate; forming a thin film solar cell layer series on the surface of the stripping layer; forming a flexible support layer on the surface of the thin film solar cell layer series; and separating the flexible support layer and the whole thin film solar cell layer series from the hard support plate. In the invention, the flexible thin film solar cell can be manufactured directly on the surface of the hard support plate such as glass without depending on traditional flexible substrates which are high in requirements for physical and chemical characteristics and high in expense and without the complicated flexible thin film solar cell manufacturing process of firstly adhering the flexible substrate on the surface of the hard support plate and then carrying out thin film deposition, therefore, the method of the invention is a revolutionary method for directly manufacturing a large-area and internal cascade flexible thin film solar cell on the hard support plate.
Owner:BEIJING JINGCHENG BOYANG OPTOELECTRONICS EQUIPCO

Maximum power tracking control method

The invention provides a maximum power tracking control method, relating to the technical field of solar energy power generating. The method comprises the following steps: a solar tracking system sends out corresponding control signals according to the detecting results of an optical tracking detector, controls running of the mechanical part of a tracking and positioning system of biaxial machinery so that sunlight always vertically irradiates a solar panel; meanwhile, the detecting results of the optical tracking detector are fed back to a maximum power point tracking controller and the maximum power point is tracked by combining the characteristics of the solar panel. By the method, conversion efficiency of the system is improved on the basis of improving the utilization factor of solar radiation energy and cost of the system can be indirectly lowered; closed-loop control of the grid-connected current can be realized so that the output current of inverters is synchronous with the line voltage (the power factor is 1), thereby avoiding the impact of the grid-connected current on power networks; system dynamics has the obvious characteristics of fast response speed, safe and reliable running, no pollution to the line voltage and low harmonic distortion of the grid-connected current, etc.
Owner:BAODING TIANWEI GRP CO LTD

Non-isolated direct-current converter type differential three-level inverter

InactiveCN102594189AImprove conversion efficiencyReduce switching stress and energy lossAc-dc conversionThree levelHigh voltage
The invention discloses a non-isolated direct-current converter type differential three-level inverter. The circuit structure of the inverter consists of a power supply, an input filter, two bidirectional three-level direct-current converters, an output filter and an alternating current load, wherein the bidirectional three-level direct-current converters are connected in a differential way, i.e. input ends are connected in parallel and output ends are connected in series. By the inverter, the function of converting unstable and low-quality direct-current voltage into stable and high-quality sine alternating-current voltage as required can be realized. A circuit topology family of non-isolated direct-current converter type differential three-level inverters, including Boost type, Buck type, Buck-Boost type, Cuk type, Sepic type and Zeta type, is obtained by changing the type of the bidirectional three-level direct-current converters. The inverter has the characteristics of simple circuit topology, capability of adapting to wider voltage input range, bidirectional power current, single-stage conversion, small volume, light weight, low cost, simple control, high conversion rate, high load adaptability, high dynamic performance and the like, and is applied to a high-voltage input occasion.
Owner:NANJING UNIV OF SCI & TECH

Floating type multi-floater wave power generation device

The invention discloses a floating type multi-floater wave power generation device which comprises a floating type structure, a mooring system, a hydraulic transmission system and a power generation system. The floating type structure floats on the sea surface and is moored through the mooring system. Multiple floaters of the floating type structure are connected with a main floating body through swing arms respectively. The floaters move along with waves and resonate together with waves, the floaters which do the floating and sinking movement after being excited by waves drive the swing arms to swing around a fixed fulcrum, a piston rod of a hydraulic cylinder is driven to reciprocate, an oily medium in the hydraulic cylinder is pushed to enter a hydraulic system to form a circuit and to enter a hydraulic motor, the hydraulic motor rotates to drive an electric generator to generate electricity, and then power generation is achieved through wave energy. According to the floating type multi-floater wave power generation device, the multiple floaters which move up and down along with waves absorb sea wave energy, stability of the main floating body of the device in waves is improved through a damping type base plate and the mooring system which adopts the three-point horizontal mooring method, and the floating type multi-floater wave power generation device has the advantages of being high in conversion efficiency, stability and reliability.
Owner:STATE OCEAN TECH CENT

Inner rotor direct-driving type structure of suspension type single-rail train

ActiveCN106114525AImprove conversion efficiencySmall sizeElectric locomotivesElevated railway with suspended vehicleAir springAir suspension
The invention provides an inner rotor direct-driving type structure of a suspension type single-rail train. The structure comprises a framework of a bogie, wherein the framework of the bogie comprises a side frame, cross beams and a framework center platform; an air spring and a sleeper beam are arranged on the framework center platform; transverse pull rods are arranged on the front side and the back side of the sleeper beam; the sleeper beam is press-fitted on the air spring; a suspension device is a four-connecting-rod mechanism; a pair of traveling wheels is transversely arranged on each of outer sides of the side frame; guiding wheels are arranged at two ends of the side frame; and an inner rotor type permanent-magnet motor for providing rotating power for the traveling wheels is arranged between each pair of the transverse traveling wheels. According to the structure, the inner rotor type direct-driving motors are used as driving devices of the bogie, so that the energy conversion efficiency is greatly improved; and meanwhile, the size and the heating value of the motors are reduced, the structure of the bogie is simplified, the reliability of the bogie is improved, the maintenance cost is reduced, and noise caused by the bogie during running is reduced.
Owner:SOUTHWEST JIAOTONG UNIV

Coupling inductor applicable to multi-phase interleaved parallel converter

The invention discloses a coupling inductor applicable to a multi-phase interleaved parallel converter. A structure of the coupling conductor is mainly formed by combining backcoupling transformers consisting of two phases of windings and an energy storage inductor; for an n-phase interleaved parallel converter, the quantity of the backcoupling transformers is n-1 or n or n(n-1)/2, and the connection relation of the backcoupling transformers is a central type or a head-tail closure type or a two-two combination type respectively; and the energy storage inductor is serially connected with at least one phase of the winding in the backcoupling transformers, the winding quantity of the energy storage inductor is between 1 and n, and various phases of the windings of the energy storage inductor are independent from each other or are subjected to forward coupling. The coupling inductor ensures that an energy storage function and a filtering function are borne by the energy storage inductor and the backcoupling transformers respectively by splitting the energy storage function and the filtering function, can effectively avoid the intrinsic contradiction between the energy storage function and the filtering function in a multi-magnetic circuit magnetic core, further reduce the loss and volume of magnetic components, improve the power density, the conversion efficiency and the output dynamic performance of the converter, and is suitable for the multi-phase interleaved parallel converters.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Functionalized graphene-based solar back aluminum slurry and preparation method thereof

The invention discloses functionalized graphene-based solar back aluminum slurry and a preparation method thereof. The solar back aluminum slurry is prepared from the following raw materials in percentage by weight: 65-73 percent of aluminum powder, 1-3 percent of glass powder, functionalized graphene dispersion liquid containing 0.12-0.15 percent of functionalized pure graphene, 20-30 percent of organic carrier, 3-5 percent of auxiliary agent and the balance of diluent, wherein oxidized graphene is modified by using a coupling agent; the modified oxidized graphene is obtained through reaction of the coupling agent and the oxidized graphene and then is reduced to obtain the functionalized graphene; the functionalized graphene is dispersed into terpineol and butyl carbitol with a mass ratio of 5.5-6.5:1 after being subjected to ultrasonic treatment to form the functionalized graphene dispersion liquid. The preparation method comprises the steps of mixing, grinding and vacuum deformation of the raw materials. The solar back aluminum slurry has the advantages of high printing rate and good adhesion, conductivity, bending resistance and weathering resistance.
Owner:广州市尤特新材料有限公司

Method for manufacturing solar battery with selective emitter

InactiveCN102332492AImprove conversion efficiencyImprove short circuit currentFinal product manufactureOther printing apparatusReverse currentHigh concentration
The invention relates to a method for manufacturing a solar battery with a selective emitter, and in particular relates to a method for manufacturing a solar battery with a selective emitter through carrying out light doping on the positions below a positive electrode grid line and the vicinity of the positive electrode grid line as well as heavy doping on the positions between electrodes. When the electrodes are printed, high-concentration phosphorus slurry is doped in electrode slurry, and the combination of diffusion, rapid diffusion and regular diffusion is carried out in a phosphorus oxychloride atmosphere after the high-concentration phosphorus slurry is subjected to electrode grid linear silk-screen printing. The conversion efficiency of a crystal silicon solar battery is improved due to the improvement of a selective emitter technology for open-circuit voltage, short-circuit current and filling factors; the internal resistance of the battery is reduced, the inner losses and the heating are decreased in the process of power generation, and the service life of a battery plate is prolonged at a certain extent; the reverse current is reduced; the performances at a low light level are good; and the light quantum response of the battery is improved due to the low diffusion density, the battery consistency is good, and the technology is stable.
Owner:浙江天明国际科技有限公司

Silicon quantum dot solar cell based on heterojunction structure and preparation method thereof

The invention discloses a silicon quantum dot solar energy cell based on a heterojunction structure and a preparation method thereof. The solar energy cell comprises a silver aluminium composite back electrode, a P-type monocrystalline silicon substrate, a silicon nitride thin layer, an N-type amorphous silicon layer, a transparent conductive film and a silver electrode from the bottom up. The silicon nitride thin layer contains silicon quantum dots with a diameter of 1-6 nm. The transparent conductive film is an Al-doped ZnO transparent conductive film with a thickness of 200-300 nm. The P-type monocrystalline silicon substrate for texturing is provided with the silicon nitride layer containing the silicon quantum dots, deposited with the N-type amorphous silicon layer, then deposited with the Al-doped ZnO transparent conductive film, finally both sides of the above resultant are added with the silver electrode and an Al-back surface field respectively. The cell has the advantages ofsimple structure, wide spectrum response range, high open-circuit voltage and large photoproduction current, and a preparation step of the cell is compatible with a present technique. The invention provides a good solution method for increasing present silicon-based solar energy cell conversion efficiency.
Owner:HUAZHONG UNIV OF SCI & TECH
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