47results about How to "Reduce energy storage capacity" patented technology

The invention provides a capacity configuration method of a hybrid energy storage system for stabilizing wind power fluctuation. The hybrid energy storage system comprises a power type energy storage system and an energy type energy storage system. The method includes the steps that (1) the grid connection active power of wind power and the active power P (t) of the hybrid energy storage system are acquired, and a wavelet packet decomposition method is utilized to acquire power type energy storage power and energy type energy storage power respectively; (2) the hybrid energy storage system at different rated power P and under different capacities is configured, and the stabilizing effect of the hybrid energy storage system is analyzed; (3) according to the stabilizing effect and an improved particle swarm algorithm, the capacity of the hybrid energy storage system is configured. Compared with the prior art, according to the capacity configuration method of the hybrid energy storage system for stabilizing wind power fluctuation, a control policy is built according to the current electric quantity conditions, power magnitude required to be exerted and the rated power of the power type energy storage system and the energy type energy storage system and the improved particle swarm algorithm, and wind power fluctuation is stabilized and effectively controlled.

The invention discloses a control method of a hybrid energy storage system for stabilizing the power fluctuation of an intermittent type power source, comprising the following steps of acquiring the real-time power of the intermittent type power source, the synthetic output power of power and stored energy, the SOC (State of Charge) of a battery and the voltage of a supercapacitor by a data acquisition module, and sending data to a stabilizing and control module; processing the data in the stabilizing and control module and judging whether the power output is needed or not according to a fluctuation power; and in the case of needing power output, outputting a control power instruction and a charge/discharge instruction, and carrying out output by the energy storage system according to the control instruction, wherein electric energy output by the energy storage system passes through PCS (Power Converters), is synthesized with the output of the intermittent type power source through a circuit breaker respectively and merges into a power grid through a transformer. By the adoption of the control method of the hybrid energy storage system for stabilizing the power fluctuation of the intermittent type power source, the defects that when the power fluctuation of the intermittent type power source is stabilized by the prior art, as the energy storage system mainly adopts a single energy storage medium, the ability of stabilizing the power fluctuation of the intermittent type power source is weak and the service life of an energy storage element is shorter are overcome; and therefore, the practicability and the economical efficiency are enhanced.

Provided herein is an autonomous or semi-autonomous vehicle fleet comprising a plurality of electric autonomous vehicle for apportioned display of a media, operating autonomously and a fleet management module for coordination of the autonomous vehicle fleet. Each autonomous or semi-autonomous vehicle comprising a screen configured to display the media. Activation, deactivation, brightness modification, in combination with specific media selection enables more efficient media display.

The invention provides an energy storage configuration method for output fluctuations of a smooth grid-connected wind-solar power generation system. The method includes the steps of firstly, obtaining power data P(n) output by the grid-connected wind-solar power generation system, and judging whether the maximum power fluctuation quantity of the power data P(n) and the maximum power fluctuation ratio of the power data P(n) meet the restraint condition of the grid-connected fluctuations of the grid-connected wind-solar power generation system or not; secondly, obtaining the frequency range [omega L, omega H] of the power data P(n) after the discrete fourier transformation is conducted on the power data P(n), and determining the compensation frequency omega c through the frequency testing method and the low-pass filtering; thirdly, determining an energy storage capacity EN and an energy storage initial charge state SOC0. Compared with the prior art, the energy storage configuration method for output the fluctuations of the smooth grid-connected wind-solar power generation system is reliable and easy to achieve, and effectively solves the problem of the grid-connected fluctuations of a renewable energy source power generation system.

The invention discloses a new energy power supply system for an urban rail traction network and a control method. The system comprises an independent energy storage system located in a middle sectionof a line and a wind-photovoltaic-energy storage hybrid power generation system located at a car depot or a parking lot at an end of the line. The method comprises a step of obtaining a load predictedpower and an expected peak-valley value according to offline prediction data and historical data and judging whether there is a load based on urban rail running data, and a step of judging an operating condition based on a real-time voltage, comparing a predicted load power at a next moment and the expected peak-valley value and judging whether a state is a load running peak-valley state, and determining different control strategies through a judgment result to realize the effective control of an energy storage device in an independent energy storage system and a wind-photovoltaic-energy storage hybrid power generation device and an energy storage device in the wind-photovoltaic-energy storage hybrid power generation system. According to the invention, the consumption of renewable energysources such as local wind and light can be promoted, the grid pressure fluctuation is improved, the peak-load shifting is carried out for the load while the regenerative braking energy is effectivelyrecycled, the operating cost of urban rails is reduced, and the economic benefits are good.

The invention relates to a unified power quality control device employing a resonant electronic switch, and belongs to the technical field of power electronics and flexible alternating current transmission and distribution. The device comprises the resonant electronic switch, a voltage source converter, an energy storage unit and a master control system, wherein the master control system consists of a master controller and a plurality of sensors; the resonant electronic switch comprises a group of inductors Lr1 and Lr2, a group of capacitors Cr1 and Cr2 and a group of bidirectional thyristors T1; a branch formed by connecting the bidirectional thyristors T1 in series with the inductor Lr2 and the capacitor Cr1 is connected in parallel with the inductor Lr1; and a parallel branch formed by Lr1, Lr2, Cr1 and T1 is connected in series with the capacitor Cr2. A method comprises the steps of judging various power quality faults and controlling the device to quickly switch and operate among four modes. The device has the advantages of simple structure, low cost, high overload resistance and high operation efficiency.

The invention discloses a flexible packaging method of a laminated structure supercapacitor, and belongs to the technical field of supercapacitor preparation. The method comprises the steps of singlebody packaging and multi-single-body series packaging, and specifically comprises the following steps of constructing a laminated structure to be placed; sealing a flange structure; performing electrolyte injection in a vacuum mode; sealing an annular sealing ring; and carrying out multi-single-body series packaging. By means of the elastic flange structure, flexible packaging of the supercapacitor is achieved, and the packaged device has certain compressible capacity in the thickness direction under the mechanical action, and convenience is brought to application of the supercapacitor in thefield of special mechanical environments such as flexible electronics and the like. In addition, due to the adoption of the annular sealing ring structure, the airtight packaging of the supercapacitorliquid injection port is realized, so that the volatilization failure phenomenon of the electrolyte in the long-term placement process of the supercapacitor can be effectively reduced, and the storage life of the device is prolonged.

A peak sheaving and valley filling method for a grid-connected microgrid containing a wind-light-storage-electric vehicle belongs to the field of power grid management. A microgrid management strategyis divided into a peak sheaving and valley filling stage and a power fluctuation suppression stage, peak and valley adjustment of a distributed renewable energy-containing microgrid connection line is achieved by matching of slow charging time of a translation electric vehicle and charging and discharging of a storage battery, and a high-frequency component and a low-frequency component in powerfluctuation are respectively suppressed by a supercapacitor and the storage battery and by considering short-term power fluctuation of the connection line caused by fast charging of the electric vehicle. By the method, energy optimization and coordination of the grid-connected microgrid containing the wind-light-storage-electric vehicle can be achieved, the electric energy quality of a circuit isensured, and the running economy of the microgrid is improved.

The present invention discloses an electrified railway three-phase photovoltaic DC side energy storage system and a control method thereof. A three-phase access mode is used by a photovoltaic power generation system, and an energy storage device is connected to a photovoltaic direct-current side. The operating mode selection is carried out according to real-time detection data and a processing result, and combined with traction load characteristics, a strategy of self-generation and use and extra power for grid is used. When a traction load is detected, a self-generation and use mode is used,when the power is supplied to the load, extra electric energy is stored in energy storage equipment, and an effect of 'peak-load shifting' is achieved. When an electric arm idle load is detected, themode is switched to an extra power for grid mode, and photovoltaic and energy storage equipment transmits electric energy to a grid at the same time. The reasonable dissipation of photovoltaic energycan be realized, a discarded electric quantity is reduced, at the same time, a configured energy storage capacity is reduced, and the economic efficiency of the system is improved.

The invention discloses a household energy optimization system and method based on multi-user networking shared energy storage, and the system comprises a centralized shared energy storage module which consists of a power electronic device and a group of single storage batteries, and is used for the power utilization and energy storage of a plurality of household users; the internal power supply module which is formed by networking a plurality of home users and is used for direct energy circulation among different users; the energy optimization module which is used for investing, maintaining and managing the centralized shared energy storage module, maintaining the power balance of the internal power supply module and providing power utilization and energy storage optimization services forusers; the home user side module which is used for arranging a next-day home appliance power utilization plan and carrying out information exchange and online payment with the energy optimization module; the external power supply module which is communicated with external power supply equipment and used for supplying power to the whole system, energy storage equipment originally scattered in a user home is changed into centralized shared energy storage system coordination optimization, and compared with original scattered energy storage equipment, the total energy storage capacity is reduced,and the energy storage space utilization rate is increased.

The invention discloses a voltage compensation and uninterrupted power supply method for a dynamic voltage restorer based on a photovoltaic power generation unit. The voltage compensation and uninterrupted power supply method for a dynamic voltage restorer based on a photovoltaic power generation unit sets an energy storage device of the dynamic voltage restorer as a photovoltaic power generationunit, and uses a rectifier to connect with a distribution network to properly control the switching signals therein to achieve voltage sag and voltage swell suppression, and reduce the capacity of energy storage and the cost, and at the same time, when the power supply is interrupted or when the light is sufficient, the photovoltaic power generation unit can be used as an online UPS function to continuously supply power to the load. The voltage compensation and uninterrupted power supply method for a dynamic voltage restorer based on a photovoltaic power generation unit improves the reliability of the system, rationally utilizes the photovoltaic power generation unit, improves the equipment utilization rate, improves power supply quality, and achieves energy saving and emission reduction.

The invention provides a microgrid energy optimization method based on a power spring, which comprises the steps of analyzing the topological structure of the power spring to obtain an optimization constraint condition for the stable operation of the power spring, and obtaining a power spring optimization part by taking the operation efficiency of the power spring as an optimization target; according to the operation factors of energy storage, determining the optimization constraint condition for the stable operation of energy storage, and obtaining an energy storage optimization part by taking the charge and discharge times of an energy storage system as an optimization target; considering the upper and lower limits of output of controlled distributed generation and the climbing speed asthe optimization constraint condition for the optimization part of controlled distributed generation, and obtaining a controlled distributed energy optimization part by taking the operation efficiencyof controlled distributed generation as an optimization target; and on the basis of the optimization constraint conditions in the previous three steps, combining the optimization targets in the previous three steps with the additional optimization factors of a microgrid to achieve the power balance of the entire microgrid. The microgrid can work in a stable and efficient operation state.

The invention relates to a dynamic voltage restorer-based double-fed asynchronous wind generator unit control method. The method comprises the following steps: (1) building a dynamic voltage compensator-based double-fed asynchronous wind generator unit control system; (2) when a sudden change of a voltage is caused by a fault, obtaining a suddenly changed voltage vector for negative and negative sequence separation by a dynamic voltage restorer DVR; (3) calculating to-be-compensated voltage amount changing along with the time, and simultaneously giving a control signal; (4) outputting the voltage amount by the dynamic voltage restorer DVR, compensating a stator terminal voltage of a variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage; (5) obtaining a suddenly changed new grid voltage vector when the sudden change is caused again during a fault period; (6) calculating the to-be-compensated voltage amount changing along with the time according to the suddenly changed voltage vector; and (7) outputting the voltage compensation amount by the dynamic voltage restorer DVR, and compensating the stator terminal voltage of the variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage. The dynamic voltage restorer-based double-fed asynchronous wind generator unit control method can achieve stable fault ride-through.

A thermal management system for an on-vehicle battery includes a battery, a first thermal element, a second thermal element, a battery mounting bracket, and a vehicle body structural element. The battery mounting bracket includes a first portion attached to the vehicle body structural element, and a second portion attached to the first thermal element. The first thermal element is attached to the first end portion of the battery, and the second thermal element is attached to at least one of the second end portion, the first and second side portions, the top portion or the bottom portion of the battery. The first thermal element is composed from a first phase-change material having a first phase-change temperature and the second thermal element is composed from a second phase-change material having a second phase-change temperature, wherein the first phase-change temperature is greater than the second phase-change temperature.

Method of driving an acoustic piezoelectric transducer (6) characterized in that a signal (8), resulting from the time multiplexing of at least two rectangular periodic signals (12a, 12b) of different frequencies and having pulses of fixed duration and whose duty cycle is less than 0.5, is applied to the terminals of the transducer (6). This signal may result from the time sum of at least two undulating logic signals of different durations.

The invention relates to a gravity energy storage system. According to the structure of the gravity energy storage system, at least two vertical shafts are built underground, and the bottoms of the vertical shafts mutually communicate; a bidirectional water pump is arranged on a channel at the bottom of each vertical shaft, and each bidirectional water pump is connected with an upper water tank onthe ground through a water pipe and a water valve; rails are arranged above each vertical shaft, a gantry crane is arranged on the rails, and a lifting motor is installed on a base at the lower partof the gantry crane; the lifting motor is connected with a winding drum and drives the winding drum to rotate, and a steel wire rope is wound on the winding drum; and the steel wire rope penetrates through a fixed pulley set on the gantry crane and the rear tail end of a movable pulley set to be fixed on a gantry crane main beam on the upper portion of the gantry crane, a lifting appliance is arranged below the movable pulley set, and an energy storage block is hooked through the lifting appliance. According to the gravity energy storage system, electric power can be smoothly output, the occupied area is small, site selection is easy to achieve, no emission exists, pollution is avoided, the storage power is high, the efficiency is high, the service life is long, the problem of new energy grid connection can be effectively solved, and power fluctuation reduction can be effectively reduced.

The invention provides a low-temperature-resistant water-based zinc-polymer battery. The low-temperature-resistant water-based zinc-polymer battery comprises preparation of a positive electrode and preparation of a low-temperature-resistant zinc sulfate electrolyte. An organic electrode material is prepared by allowing any one of three aromatic organic molecules provided by the invention and having energy storage effect verified by experiments to attach to a substrate of porous activated carbon by an electrochemical polymerization deposition method. Methanol is added into a zinc sulfate electrolyte with a certain concentration, so the effects of greatly reducing a freezing point and keeping good ionic conductivity at low temperature are achieved, and the zinc ion battery can normally workwithin a temperature range of -30 DEG C to -50 DEG C. According to a polymer positive electrode material-zinc negative electrode combined energy storage device provided by the invention, a sweep voltage window can be broadened from 0.1-1.7 V at normal temperature to 0.1-2.2 V in a low-temperature environment of -20 DEG C, and charge storage capacity can be kept at about 55% at normal temperature.

A light-emitting diode (LED) driving apparatus includes a rectifying module configured to rectify an alternating current voltage and output a first driving voltage, an LED light emitting module including a first LED group, and a second LED group to an n-th LED group, and configured to receive the first driving voltage from the rectifying module, n being a positive integer of two or more, an LED driving module configured to sequentially drive the first LED group to the n-th LED group according to a voltage level of the first driving voltage, and a second driving voltage providing module connected in parallel to at least one LED group of the second LED group to the n-th LED group.

The invention provides a compensation control system based on flywheel energy storage. The system comprises a flywheel energy storage motor, a converter A, a converter B, a change-over switch, a bypass switch and a series transformer, the flywheel energy storage motor carries out rectification and inversion through the converter A and the converter B, the change-over switch and the bypass switch are used for controlling compensation, and the series transformer is used for connecting electric energy into a power grid. The compensation control system can realize effective conversion between electric energy and flywheel rotor mechanical energy based on a flywheel energy storage charging and discharging control strategy, ensures that the flywheel energy storage system outputs constant power in a discharging state, can timely and accurately compensate the voltage required by the system when the power quality disturbance occurs and generate the minimum load voltage transient distortion, can reduce the compensation control injection active power, saves the energy storage capacity of the flywheel motor, and prolongs the compensation time.

The invention discloses an elevator colony electric energy dispatching device and method based on a direct-current microgrid. When a traditional elevator runs, the regenerated electric energy of the elevator is dissipated mainly by means of a bleeder resistor, or fed back to a grid, or stored completely for reuse. According to the energy-saving regenerated electric energy dispatching device and method for an elevator colony comprising two or more elevators, the intelligent building direct-current microgrid is established, regenerated electric energy is dispatched to an elevator serving as a load, so that regenerated electric energy is directly utilized, electric energy is prevented from being fed back to the grid, and the problem of high cost of a system caused by complete storage of regenerated energy is solved. By dispatching the regenerated electric energy of the elevator colony, energy saving is achieved for elevators, and then energy saving is achieved for intelligent buildings.

The invention relates to a planning model and a solving method for wind power cluster shared energy storage joint participation primary frequency modulation, in particular to a primary frequency modulation capacity planning method considering wind power cluster shared energy storage joint participation. A wind power output uncertainty model is established through probability distribution based on Weibull distribution, output characteristics of each wind turbine generator under a wind power cluster are comprehensively considered, shared energy storage is configured in a centralized manner to jointly undertake a primary frequency modulation task, and a relationship between reliability and economy is processed through chance constraint planning. And establishing a wind power cluster shared energy storage joint participation power grid primary frequency modulation capacity optimization model. And finally, the opportunity constraint is converted into a deterministic constraint solving method, so that the model solving efficiency is improved. According to the determined scheme, under the conditions that the number of wind turbine generators is increased and wind power cluster data is huge and complex, coordinated planning of economy and reliability of primary frequency modulation of the wind storage combined system is achieved, and the method has better solving efficiency and has application and popularization prospects.

The invention relates to a control method and device for a converter in a doubly-fed wind power system. The method comprises the steps of: determining a control instruction of a converter in the doubly-fed wind power system according to a frequency deviation of the power grid; generating PWM pulse signal of the converter in the doubly-fed wind power system according to the control instruction; andemploying the PWM pulse signal to control the converter in the doubly-fed wind power system. According to the technical scheme of the invention, the inertia level and the inertia effect of the doubly-fed wind power system can be enhanced, the inertia level of the power system after wind power integration is improved, and the demands on the energy storage capacity and the energy storage cost are reduced.

The invention discloses a test system for simulating the operation of a lightning arrester based on a vacuum gap. The test system comprises a lightning generator, a voltage divider, test equipment, a Rogowski coil and a vacuum breakdown gap, wherein the high-voltage end of the lightning generator is connected with the high-voltage end of the voltage divider, the high-voltage side of the test equipment and the anode of the vacuum breakdown gap, the cathode of the vacuum breakdown gap is connected with the low-voltage side of the test equipment, the low-voltage end of the voltage divider and the grounding end of the lightning generator, and the Rogowski coil is sleeved on the grounding end of the lightning generator. The system can simulate the operation test of the lightning arrester, is lower in test cost, and consumes less electric energy of a power supply.