219 results about "Supercapacitor energy storage" patented technology

An ultracapacitor energy storage cell pack including an ultracapacitor assembly including a plurality of ultracapacitors, each ultracapacitor including opposite ends with connection terminals protruding therefrom for directly connecting the ultracapacitors end-to-end in series; and a plurality of interconnections for mechanically and electrically interconnecting the ultracapacitors end-to-end in series without the connection terminals from adjacent ultracapacitors contacting each other, preventing mechanical stress in the connection studs.

Disclosed is a comprehensive coordination control method of a wind-solar direct current micro-grid. The wind-solar direct current micro-grid comprises wind driven generator and alternating current (AC)/direct current (DC)/DC converters, photovoltaic array and DC/DC converters, a circuit interrupter, AC/DC load and DC/AC and DC/DC converters, a DC bus, a supercapacitor energy storage system and bi-directional DC/DC module, a storage battery energy storage system and bi-directional DC/DC module, a bi-directional AC/DC converter, a coordination controller, a control network for connecting the coordination controller and the converters and a communication network for connecting the coordination controller and a large power grid power scheduling center, and an operational mode of the wind-solar direct current micro-grid is divided into two categories of a grid-connected mode and an island mode. Stable operation of the wind-solar direct current micro-grid under the grid-connected mode and the island mode is achieved by comprehensively using power scheduling, load scheduling and energy storage device scheduling.

This invention is a system and a method that uses the braking resistor, commonly used and available in electrically or hybrid-electrically propelled vehicles, to limit the precharge current during the startup of a high power ultracapacitor pack energy storage device and/or safely and rapidly discharge an ultracapacitor pack for maintenance work or storage to lengthen the life of the individual ultracapacitor cells and, correspondingly, the whole pack. The use of the braking resistor for precharging an ultracapacitor energy storage pack is an effective and less expensive method compared to other methods such as a separate DC-to-DC converter. This method includes the control logic sequence to activate and deactivate switching devices that perform the connections for the charging and discharging current paths.

This invention characteristic is that the flexible flow-collection body comprises support layer and conducive layer, the support layer is an organic membranous winding material whose thickness is 10-100mum; conductive layer is 1-500-layer conductive membranous material whose thickness is 10nm-10mum; The conductive layer material of the flexible flow- collection body is nickel, the platinum, golden, ruthenium, the cobalt or the manganese metal membranous material; RuO2, NiO, TiO2,SnO2, ZrO2, V2O5 or MnO2 transition metal oxide compound membranous material, poly-aniline, poly-pyrrole and poly-thiophene conductive polymer membranous material.

The invention relates to an electric energy quality regulating system based on energy storing of a super capacitor, which belongs to the field of electric energy quality regulation technology and is characterized by comprising a three-phase voltage type PWM (Pulse Width Modulation) rectifier 3, a bidirectional DC/DC converter 4 and the super capacitor 5; the system is connected with a power network system 1 in parallel; during normal operation, the three-phase voltage type PWM rectifier 3 is used for stabilizing DC voltage and simultaneously realizing reactive harmonic compensation; the bidirectional DC/DC converter 4 is used for controlling the charging of the super capacitor 5; when the power network system 1 has short-circuit fault, the super capacitor 5 is used for controlling the output of stable DC voltage by the bidirectional DC/DC converter 4; and the three-phase voltage type PWM rectifier 3 is used for sending out reactive power to support the voltage of the power network system 1 and improve the voltage quality. The regulating system has the capabilities of reactive harmonic compensation and low-voltage crossing and reduces equipment redundancy. The super capacitor 5 has longer service life, thereby reducing the operating cost. The system can charge the super capacitor 5, thereby saving extra charging devices.

A hybrid supercapacitor energy storage device comprises at least one lead electrode, at least one carbon electrode, a separator, a casing, and an acid electrolyte. The lead electrode is enveloped in a common glass mat separator known in the lead-acid battery industry. The carbon electrode comprises a highly conductive current collector which is a sheet or other metal material sandwiched between two sheets of electronically conductive shield material. Activated carbon is manufactured using a binder such as polyethylene or PTFE adhered to and in electrical contact with the shield material of the current collector.

The fault ride-through and power smoothing system includes a buck converter for Maximum Power Point Tracking (MPPT) of a PV array power system, a buck-boost converter to connect a supercapacitor energy storage system (SCESS) to the DC link, and a voltage source converter (VSC) to transfer the DC link power to the grid. Three independent controllers are implemented, one for each power electronics block. The effectiveness of the controllers is examined on Real Time Digital Simulator (RTDS).

The invention discloses a polypyrrole microelectrode with three-dimensional structure which belongs to the technical field of the micro-electro-mechanical preparation and is used in the miniature supercapacitor, and a preparation method thereof. The preparation method of the microelectrode comprises the following steps: adopting the MEMS technology to coat a SU-8 epoxy group negative chemically amplified resist on the surface of a copper substrate, performing spin-coating, pre-baking, lithographic process treatment, exposure, post-baking, development, rinsing and heat setting to form a columnar structure which is prepared from SU-8 photoresist and is in an array arrangement, on the surface of the copper substrate, and covering a functional film composed of polypyrrole and conductive material on the surfaces of the copper substrate and the microcolumn array microelectrode. The invention solves the problems that the common polypyrrole electrode with a two-dimensional structure can not store a large quantity of charges, have high internal resistance and the like, thus improving the energy storage characteristic and large current discharge performance of the miniature supercapacitor. The miniature supercapacitor of the invention has wide application prospect in the fields of sensor network node power supply, micro-robot driving power and fuze power.

The invention relates to a layer casting molded graphene-nonmetal-metal composite material and a preparation method thereof. The preparation method of the layer casting molded graphene-nonmetal-metal composite material comprises the following steps of carrying out mixed grinding and shearing on a graphene quantum dot and/or a microchip and a nonmetal-metal substance under ultrasonic action, drying an obtained mixture, then subjecting the mixture to laser treatment, carrying out quenching and refinement, and promoting molecular rearrangement and grafting fusion. The layer casting molded graphene-nonmetal-metal composite material prepared by the preparation method has advantageous performance of being high in hardness, high in strength and low in electrical resistivity and being easily processed and used, can be widely applied to the field of material processing of tooth implantation, super electric drills and the like, the field of energy storage materials for batteries and super capacitors, the field of catalyst materials, the field of heat radiating materials, the field of medicine, the field of coating materials, the field of electrically conductive ink, the field of photoelectric and sensor materials, the field related to biology, and the like.

The invention discloses a supercapacitor energy storage uninterruptible power supply based on a current transformer, which comprises the current transformer, a rectifying circuit, a reverse discharge protection diode D1, a forward discharge diode D2, a DC voltage conversion circuit, a bidirectional switch and a supercapacitor, wherein an output end of the rectifying circuit is connected with a bypass switch, a cathode of the forward discharge diode D2 is connected with an overvoltage protection sampling circuit, a charging voltage sampling circuit and a reference voltage circuit; an output end of the overvoltage protection sampling circuit is connected with an overvoltage control and drive circuit, an output end of the charging voltage sampling circuit is connected with a charge-discharge control and drive circuit, the bypass switch is connected with an output end of the overvoltage control and drive circuit, and the bidirectional switch is connected with an output end of the charge-discharge control and drive circuit. The invention further discloses a power supply method of the supercapacitor energy storage uninterruptible power supply based on the current transformer. The supercapacitor energy storage uninterruptible power supply can greatly increase energy utilization rate, the uninterruptible power supply method are simple in steps, and the supercapacitor energy storage uninterruptible power supply and the power supply method thereof are convenient popularization and use.

The invention belongs to the technical field of biochar material preparation, and particularly discloses a method for preparing a porous carbon material by utilizing water hyacinth, and application. The method comprises the steps of after washing, drying and smashing a collected water hyacinth biomass, firstly utilizing a hydro-thermal treatment process for degrading and removing degradable hemicellulose and low-molecule weight saccharides in the biomass, and obtaining brown coal-shape hydrothermal carbon with mass macromolecule holes; then utilizing a high temperature molten salt pyrolysis process for further carbonizing and activating the hydrothermal carbon, and further obtaining the porous biochar material with a rich hole structure and rich in surface functional groups. When the biochar prepared through the method is applied to a supercapacitor energy storage material, the biochar shows an excellent specific capacitance performance. In addition, according to the method provided bythe invention, a large amount of aquatic plant water hyacinth is converted into the high-performance biochar material, so that not only is the treatment problem of the water hyacinth biomass solved,but also the waste can be turned into wealth, and the high value-added resources of waste biomasses are transformed and utilized.

Carbon nanosheets fabricated by carbonization and activation or by carbonization alone. The nanosheets possess a disordered structure for copious reversible binding of ions at the carbon defects. They are also hierarchically micro-meso-macro porous, allowing facile ion transport at high rates both through the pore-filling electrolyte and in the solid-state. Also, a combined battery—supercapacitor energy storage device using the carbon nanosheets as one or both of the electrodes therein. Tuning the mass-loading ratio of the carbon nanosheets in the two electrodes configures the carbon nanosheets to operate either as a bulk insertion electrode (anode) or a surface adsorption electrode (cathode). The energy storage device may further include a housing with a form factor of a commercial battery.

The invention discloses a hybrid energy storage control method suitable for voltage control of an off-grid type DC microgrid. The system consists of a supercapacitor, a storage battery, and respective bidirectional DC-DC converters. The method comprises the steps that a supercapacitor energy storage system employs voltage-power sag control, and maintains the stable voltage of a DC microgrid bus; a storage battery energy storage system carries out the real-time estimation and adjustment of the remaining capacity of the supercapacity according to the voltage change of the DC bus, and indirectly carries out the compensation for the non-instantaneous power fluctuation in the system. The beneficial effects of the invention are that the system gives play to the performance advantages of all energy storage devices in the system, improves the sustainable adjustment capability of the supercapacitor, and enables the current of a storage battery to be smooth.

The invention relates to a control strategy for a super capacitor energy storage system current transformer. The control strategy is characterized by comprising steps of analyzing energy distribution states of a super capacitor energy storage system in different work modes, establishing a system mathematics model, designing a control strategy of a bidirectional DC/DC current transformer and designing a control strategy of a DC/AC voltage source type current transformer, the bidirectional DC/DC current transformer and the DC/AC voltage source type current transformer are taken as power adjusting devices, and power throughput of the super capacitor energy storage system and DC side voltage control are realized. A simulation system is established based on PSCAD/EMTDC software, accurate and rapid response to designated charging and discharging powers can be realized by the super capacitor energy storage system, DC side voltage work is stable, and work efficiency is high.

The invention relates to a hybrid energy storage control system with a variable coefficient load observer and a design method thereof; the output end of a hybrid energy storage device is connected respectively to a battery energy storage unit and a supercapacitor energy storage unit; the battery energy storage unit and the supercapacitor energy storage unit are parallelly connected to a direct-current bus respectively through a two-way DC-DC converter; the output end of a variable coefficient finite time load observer is connected to the input end of a hybrid energy storage control device; the variable coefficient finite time load observer uses real-time voltage and real-time current of the direct-current bus as inputs, and outputs load impedance estimated value to the input end of the hybrid energy storage control device; the hybrid energy storage control device controls the energy storage unit and maintains the voltage of the direct-current bus stable. Compared with the prior art, the hybrid energy storage control system has the advantages that finite time precise reconstruction of state is achieved, quick and accurate load state estimation is provided for the hybrid energy storage control device, and control performance of the energy storage system is improved.

The invention discloses a power compensation and energy recovery device for a gas power generation system. The power compensation and energy recovery device comprises a super capacitor energy storage module, a two-way DC/DC converter, an energy management system, a detection unit and a fluctuation stabilizing device, wherein the super capacitor energy storage module is connected with a middle DC bus of a converter of the power generation system through the two-way DC/DC converter, the detection unit detects voltage and current states of the power generation system and the super capacitor energy storage module and transmits information to the energy management system, the energy management system controls the operation of the two-way DC/DC converter through calculation and analysis so as to control energy exchange between the energy storage module and the power generation system, corresponding energy is absorbed or released as required during load fluctuation, the power fluctuation is stabilized, the power of the power generation system is adjusted to be balanced, and safe and stable operation of the system is guaranteed; besides, the energy utilization rate is effectively increased due to absorption and utilization of regenerated energy produced by load brake.

The invention discloses a method for removing carbon impurities in a single-walled carbon nanotube. The method comprises the following steps: mechanically grinding; carrying out high-temperature hydrogen or medium-temperature plasma hydrogen treatment; carrying out class screening on an air flow; and repeating the steps for two or three times. According to the method, the mass fraction of the carbon impurities in the single-walled carbon nanotube, namely onion carbon nanoparticles, a multiwalled carbon nanotube or amorphous carbon can be reduced from 50% to below 0.05%. Meanwhile, as the carbon impurities are fully treated by a dry method, the bulk structure of the single-walled carbon nanotube can be maintained, thereby providing a base for applications such as energy storage of a supercapacitor or transparent conductive display. The method has the advantages of being less in equipment, simple to operate, easy to repeat, easy for process amplification and low in cost.

The invention discloses an offshore doubly-fed wind-driven generator set high-voltage ride-through (HVRT) control method and system based on supercapacitor energy storage technology. The offshore doubly-fed wind-driven generator set HVRT control method includes the steps of: obtaining a grid-connected point voltage per-unit value and the duration of a grid-connected point voltage rise; determiningwhether to activate a HVRT control mode to reduce the grid-connected point voltage; after the HVRT control mode is activated, determining whether the output active current value of a grid-side converter exceeds the active current maximum value borne by the normally operating grid-side converter; if so, determining whether a DC link voltage exceeds a critical value of the DC link voltage; and if so, starting a supercapacitor energy storage module. The method aims to avoid an off-grid accident of the offshore doubly-fed wind-driven generator set possibly caused by the sudden rise of the grid voltage in the prior art.

The invention belongs to the fields of electric power system energy storage optimization and new energy energy-storage optimization, and relates to an over-charging and over-discharging protection apparatus-equipped mixed energy storage power distribution system and method having a variable time constant. The system comprises a mixed energy storage power distribution module with a variable time constant controller, a state of charge-based mixed energy storage over-charging and over-discharging protection apparatus, a storage battery energy storage module, a supercapacitor energy storage module, a photovoltaic power generation module and a direct current load. By virtue of the mixed energy storage power distribution system and method, the storage battery power high fluctuation can be lowered effectively, and the service life can be prolonged; and meanwhile, operation of the system in the fault direction can be avoided according to a power instruction and an energy storage element statematching degree over-charging and over-discharging protection strategy, so that risk of accidents can be lowered.

The invention relates to a model prediction control method of stabilizing wind power fluctuation with hybrid energy storage, and belongs to the technical field of new energy power generation control. The method comprises the steps of determining a topological structure of a control object, namely a system structure comprising wind power, battery energy storage and supercapacitor energy storage, predicting an output value of the wind power within a control prediction interval by utilizing an average value method, determining an objective function and three constraint conditions of optimization control, solving an optimization problem at each moment, only obtaining optimization control quantity at the current moment, inputting the optimization control quantity into a battery and a supercapacitor for control respectively, summing power output by the battery and the supercapacitor and actual output power of the wind power, and then obtaining grid-connected power of an overall system after power fluctuation stabilization. The control method can achieve the power fluctuation stabilization of the wind power more economically and reliably, is simple in calculation, and facilitates engineering realization.

The invention discloses a self-adaptive power control method of a photovoltaic power generation hybrid energy storage system. The system comprises a hybrid energy storage device, a DC bus, an AC bus, converters and various loads, wherein the hybrid energy storage device comprises a photovoltaic cell array, a storage battery energy storage unit used for converting solar energy to electric energy, a supercapacitor energy storage unit and two energy storage power supplies, the storage battery energy storage unit and the supercapacitor energy storage unit are connected with the DC bus respectively through respective DC/DC converter, a photovoltaic power generation unit is connected to the AC bus through a DC/AC inverter, the DC bus passes through the DC/AC inverter to be connected with the AC bus, different control strategies are adopted, a storage battery DC/DC converter adopts power control, and a supercapacitor DC/DC converter is used for voltage control of the DC bus. The whole system adopts a self-adaptive power control strategy to achieve system coordination control, thus, the energy storage advantages of a storage battery and a supercapacitor are developed, and a good power throughput effect is obtained.

The invention discloses a cascading multi-level super capacitor energy storage system and a discharge mode control method. The system comprises at least two half-bridge converters, super capacitor energy storage units, an LC series circuit, a voltage detection unit and a controller, wherein the input end of each half-bridge converter is connected with one super capacitor energy storage unit in parallel, the half-bridge converters are connected between the anode and the cathode of a common direct current bus in a cascading manner, the LC series circuit is connected between the positive terminal of the output end of the first half-bridge converter and the negative terminal of the output end of the last half-bridge converter in parallel, the voltage detection unit is used for transmitting the end voltage of anode of the common direct current bus and end voltages of super capacitors to the controller, the controller is used for controlling each half-bridge converter to output a direct current power component and output/input a high-frequency alternating current component, the direct current power components are supplied to a load through the common direct current bus, and the high-frequency alternating current components flow between the cascading half-bridge converters and the LC series circuit for balancing energy of the super capacitors.