186 results about "Energy storage efficiency" patented technology

The invention discloses an aquifer energy storage dynamic pressure regulation and control system and method based on multi-parameter feedback, and relates to the field of pressure regulation and control. Data normalization is ensured through a standardized parameter type set, and high-quality input is provided for a subsequent model; a pressure mapping model trained based on historical data can accurately predict pressure response under an injection-production strategy, and deviation caused by experience dependence is avoided; through partition clustering and mean value calculation, the aquifer with high heterogeneity is converted into a regulation and control unit with uniform characteristics, and the pertinence of an injection-production strategy is remarkably improved; through dynamic adjustment of a pressure interval, the energy storage efficiency reduction caused by an overpressure risk or underpressure is effectively prevented; an introduced physical intervention mechanism breaks through the limitation of pure data optimization, and the hydrogeological condition is directly improved when model adjustment is invalid; the three purposes of stabilizing the pressure of the aquifer, improving the energy storage efficiency and preventing and controlling geological risks are achieved, and scientific support is provided for long-term sustainable energy storage operation.

The invention discloses a surface scraping type energy storage heat exchanger and a working method thereof, and relates to the technical field of energy accumulators, the surface scraping type energy storage heat exchanger comprises a heat exchanger body and a heat exchanger support, and the heat exchanger body comprises a heat exchanger outer shell, a heat exchanger inner shell, a heat production device, a stirring device, a surface scraping device, a pressurizing device and a protective net; a heat exchange sealed space is formed between the heat exchanger outer shell and the heat exchanger inner shell, a heat transfer working medium inlet and a heat transfer working medium outlet are formed in the heat exchanger outer shell, and a heat conduction medium and a phase change material are contained in the heat exchanger inner shell. The pressurizing device is used for pressing the phase-change material in the solid phase, and the surface scraping device is used for scraping the phase-change material which is attached to the inner wall of the heat exchanger inner shell and becomes the solid phase. The heat transfer efficiency during heat absorption and heat release can be improved, the energy storage efficiency is improved, and the actual use requirement that a heat source is a solid heat flow boundary with a fixed heat load and a fluid temperature boundary with a fixed temperature can be met.

The invention discloses a shared energy storage fine scheduling method considering multi-scene uncertainty and hierarchical decision, and the method comprises the steps: building system power-energy constraint modeling based on a typical scene set; modeling is carried out based on a typical scene set and system power-energy constraint, electricity purchasing and selling, energy storage efficiency and life degradation cost are comprehensively counted in multiple scenes, a multi-target scheduling model is formed, and opportunity constraint is introduced to ensure supply and demand reliability; based on a multi-target scheduling model, constructing a hierarchical decision-making model which takes a shared energy storage operator as a main part and takes a plurality of micro-grids / communities as an auxiliary part, and establishing a coupling constraint and power balance relation of energy storage charging and discharging-energy state-capacity leasing price; an energy storage dynamic rental price, capacity distribution and a time-sharing charging and discharging plan are obtained by adopting distributed iteration solution, and income allocation can be carried out in combination with an improved Shapley mechanism. According to the invention, the optimal decision of consumption improvement, energy consumption cost reduction and multi-agent coordinated operation under the condition of high-proportion access of new energy can be realized.

The invention provides a water-gas coupling energy storage integrated control method and system, and relates to the technical field of water-gas coupling energy storage, and the method comprises the steps: collecting water path operation parameters and gas path operation parameters; constructing a water-gas collaborative operation model; inputting the real-time system state and the power grid demand signal into the water-gas collaborative operation model; according to the power collaborative allocation scheme, generating a target control instruction, and controlling an energy storage system to execute energy storage or release operation; wherein the target control instruction is connected with an execution equipment water pump of the water path and an execution equipment air compressor adjusting valve of the air path, and the target control instruction is executed and used for intelligent control over the flow, the pressure and the valve opening degree of the water and gas execution equipment. The technical problem that the overall energy storage efficiency is not high due to the fact that water pump energy storage and compressed air energy storage lack cooperative scheduling and are independently operated in the prior art is solved, and the water-gas coupling energy storage efficiency is improved through water-gas coupling operation optimization.

The invention discloses an organic micromolecule modified polyethersulfone composite dielectric film and a preparation method and application thereof, and belongs to the technical field of functional polymer composite materials and preparation thereof. The problems that an existing PESU-based dielectric film is insufficient in energy storage density and low in charging and discharging efficiency are solved. According to the PESU-based dielectric film, PMDA is doped in a PESU substrate through a blending process, the stacking and polarization characteristics of polymer chain segments are improved on the molecular level by means of the doping of PMDA, and the charge-discharge efficiency, the energy storage density and the breakdown field strength of the PESU-based dielectric film are remarkably improved while the excellent mechanical property of the PESU substrate is kept. Test results show that the obtained composite film achieves energy density of 8.6 J / cm < 3 > and energy storage efficiency of 67.0% under the field intensity of 560 kV / mm.

The invention relates to the technical field of energy storage systems, in particular to an energy storage system power smoothing method and system based on model predictive control. By introducing the adaptive prediction model and combining with the dynamic frequency decomposition module, the power signal can automatically adjust the frequency decomposition threshold according to the dynamic change of the signal, so that the flexibility and precision of frequency decomposition are remarkably improved, and the accuracy of frequency decomposition is improved by automatically adjusting the frequency decomposition threshold on the basis of the dynamic change information. Therefore, the power difference value sequence is decomposed into a plurality of dynamic frequency components, the change trend of each frequency component is predicted, the future power requirement can be estimated more accurately, the charging and discharging strategy of the energy storage equipment is adjusted in real time, it is guaranteed that the energy storage system can provide efficient and accurate power compensation in practical application, and the energy storage efficiency is improved. According to the invention, the parameters of the adaptive prediction model can be corrected in real time, and the continuous smoothing of the power of the energy storage system is realized by continuously optimizing the frequency decomposition precision and the power prediction accuracy.

The invention relates to the technical field of compressed air energy storage, in particular to a thermal power coupling compressed air energy storage system robust scheduling method, device and equipment, and the method comprises the steps: constructing an operation model of each subsystem in a topological structure of the thermal power coupling compressed air energy storage system; a comprehensive operation model of the whole thermal power coupling compressed air energy storage system is established based on the operation model of each subsystem, thermal power resources can be utilized to the maximum extent, the energy storage efficiency is improved, the comprehensive model serves as a thermoelectric system hub, a power flow model on the power grid side and a heat supply network model on the heat supply network side are combined, an optimal scheduling model is established, and the energy storage efficiency is improved. A new energy output fuzzy set is obtained to cope with uncertain factors in actual operation, fuzzy set parameters are set according to actual data of a power grid in a target region, and the parameters are input into an optimal scheduling model to output an optimal scheduling strategy, so that the system operation cost is effectively reduced, and the system performance is improved. And the adaptability to new energy fluctuation and the risk management capability are enhanced.

This invention relates to the field of dielectric energy storage ceramics technology, specifically to a high-efficiency BiFeO3-BaTiO3-based relaxor energy storage ceramic, its preparation method, and its applications. The chemical composition of this material is 0.4Bi. 0.9 (Sm 0.5 Gd 0.5 ) 0.1 FeO3-(0.6-x)Sr 0.4 Ba 0.6 TiO3-xSr(Sn) 1 / 3 Zr 1 / 3 Hf 1 / 3 O3-y(40Bi2O3-40B2O3-20ZnO), abbreviated as BF-SBT-xS(SZH)-yBBZ, where x=0,0.05,0.08,0.10, and y takes values ​​of 0,3wt%), utilizes the synergistic refinement of polarization domains by multiple ions at the A and B sites and the reduction of remanent polarization (P r The value of Sr is used to improve energy storage efficiency (η). 2+ Ba 2+ Adjusting Curie temperature, dielectric constant, and temperature stability; introducing Sn 4+ Zr 4+ Hf 4+ This disrupts the localized structure at the B site, leading to relaxor ferroelectricity. Ultimately, compared to the matrix BiFeO3-BaTiO3, it significantly increases the breakdown field strength (E). b ), significantly increasing energy storage density (W). rec This reduces ferroelectric hysteresis and improves charging and discharging efficiency.

The utility model discloses an energy pile group hot accumulation adjusting system in a cold supply main area, which comprises a heat pump unit, a hot water user, an energy pile group, a heat storage pile group, a water inlet pipe, a water return pipe, a phase change pipe, a critical temperature sensing device, a temperature control switch and a hot water circulating pump, an inlet and an outlet of the heat pump unit are connected with an inlet and an outlet of the built-in buried pipe of the energy pile group through a main water inlet pipe and a main water return pipe. An inlet and an outlet of the hot water user are connected with an inlet and an outlet of the heat storage pile group built-in buried pipe through a main heat exchange water inlet pipe and a main heat exchange water return pipe. The energy pile group and the heat storage pile group are arranged in a crossed mode. The phase change latent heat of the inorganic phase change material is utilized, so that the energy storage efficiency of the energy pile is enhanced; and meanwhile, domestic hot water is provided through temperature control induction by utilizing the phase change heat storage pile, so that the problem of heat accumulation caused by the fact that heat released to soil in a cold supply main area is larger than absorbed heat is effectively solved, waste heat resources are effectively recycled, and resource waste is avoided.

The invention provides a dead zone compensation method, device and equipment of an energy storage converter, a medium and a product, and relates to the technical field of energy storage systems. According to the method, the interval of each phase of current is determined according to the three-phase output current acquired by the current sensor, and the basic dead zone compensation amount is dynamically calculated by combining the preset linear function, so that the problem of overcompensation or undercompensation caused by the fact that the existing fixed compensation amount method does not consider the compensation demand difference of different current magnitudes is avoided; the compensation direction is determined by obtaining the instantaneous value of each phase of modulation wave so as to obtain the target dead zone compensation amount, and accurate matching of the compensation direction and the expected output voltage direction is ensured; and the target dead-zone compensation amount and the original modulation wave are superposed to generate a corrected modulation wave, and then a pulse width modulation signal driven by a switching tube is generated, so that the pulse width modulation waveform difference caused by dead-zone time can be effectively counteracted, the output current harmonic wave of the energy storage converter is reduced, and the energy storage efficiency is improved. And stable and reliable operation of the energy storage converter and the whole energy storage system is ensured.

The invention relates to the technical field of ceramics, in particular to an anti-reduction energy storage ceramic with a high polarization characteristic and a preparation method and application thereof. The general structural formula of the ceramic is PbaLabZrcTidOe + xwt% Sm2O3, wherein a is equal to 0.5 to 1.5, b is equal to 0.01 to 0.1, c is equal to 0.5 to 1.5, d is equal to 0.005 to 0.05, and e is equal to 1.6 to 4.7; 0 lt; xlt; 5; the polarization intensity of the ceramic is larger than 50 mC / cm < 2 >, the effective energy storage density is larger than 12 J / cm < 3 >, the energy storage efficiency is larger than 70%, and synchronous optimization of the reduction resistance, the polarization performance and the energy storage density of the ceramic is achieved.

The invention belongs to the field of energy storage, and particularly relates to an energy storage system and method based on a silicon-based ultrahigh-temperature phase change heat storage coupling gas turbine. The system comprises a silicon-based ultra-high-temperature heat storage device, an outlet of the silicon-based ultra-high-temperature heat storage device is connected with an ultra-high-temperature heat recovery device, an outlet of the ultra-high-temperature heat recovery device is connected with a circulating fan and a combustion chamber, and the circulating fan is connected with an inlet of the silicon-based ultra-high-temperature heat storage device; an outlet of the combustion chamber is connected with a gas turbine, the gas turbine is connected with a gas compressor, and the gas compressor is connected with an inlet of the ultra-high-temperature heat recovery device; an outlet of the gas turbine is connected with a waste heat boiler, and an outlet of the waste heat boiler is connected with a feed water heater and a steam turbine. The ultrahigh-temperature phase-change heat storage device with the silicon-based phase-change material as the heat storage medium is adopted, electric energy is converted into high-grade heat energy to be stored, and the efficient electricity-heat-electricity energy storage round-trip efficiency can be achieved and can reach 60% through an existing gas-steam combined cycle unit. If combined heat and power generation is considered, the energy storage efficiency can reach 85%.

This invention belongs to the technical field of dielectric energy storage ceramic materials, and relates to a NaNbO3-based ceramic material with high energy storage density and efficiency and its preparation method. The chemical formula of the NaNbO3-based ceramic material is: (1- x NaNbO3- x Bi(Ni 0.2 Mg 0.2 Zr 0.1 Ta 0.2 Hf 0.2 The preparation method for NaNbO3 includes: mixing Na2CO3, Nb2O5, Bi2O3, NiO, MgO, ZrO2, Ta2O5, and HfO2, then adding zirconium oxide microspheres and alcohol, stirring, and drying to obtain a mixed powder; ball milling the pre-calcined powder and drying it again; pressing the dried powder into sheets; and sintering the pressed sheets to obtain NaNbO3-based ceramics. This invention uses a solid-state method to prepare ceramics. When the doping amount is 0.20 mol, a secondary phase appears in the ceramic sample; compared with pure NaNbO3, the energy storage efficiency is increased by about 30 times; when the doping amount is 0.10 mol, the energy storage density of NN-0.1BM5 is 5.1 J·cm⁻¹. ‑3 The energy storage efficiency is 94.0%.

The utility model discloses a compact energy storage container. The compact energy storage container comprises a container body, a multi-cluster battery pack and an electrical assembly. A partition wall is arranged in the box body and divides the inner space of the box body into a battery cavity and an electrical cavity, the partition wall is partially sunken towards one side of the electrical cavity, and a longitudinal extending cavity is formed in the battery cavity. And each cluster of battery packs is arranged in the battery cavity. Wherein two adjacent battery packs in the cluster of battery packs close to the partition wall are connected through a connecting line, and the connecting line is located in the longitudinally extending cavity. According to the compact energy storage container, the longitudinal extension cavity is formed by sinking towards one side of the electrical cavity, the connecting lines between the adjacent battery packs are arranged in the longitudinal extension cavity, the whole partition cavity does not need to be moved, only the internal space of the energy storage container is optimized, and the energy storage efficiency is greatly improved on the premise that the overall size of the energy storage container is not increased. The space requirement of a battery pack connecting line is met, the overall occupied space of the energy storage container is effectively reduced, and the space utilization rate is increased.

The application discloses a solar array simulator equalization power supply and distribution control system, and relates to the technical field of solar energy, which comprises a first photovoltaic module, a second photovoltaic module, a low-voltage detection module, an electric energy transmission module, a voltage stabilizing module, a first energy storage module, a second energy storage module, an isolation voltage transformation module, an equalization module and a micro-control module. The solar array simulator equalization power supply and distribution control system can improve energy storage efficiency and control voltage balance, improve the utilization rate of electric energy and prolong the service life.

This invention discloses a joint clearing method and system for the electricity spot market that considers the generalized energy storage characteristics of electric vehicle aggregators. Based on the operational characteristics and physical constraints of large-scale electric vehicle access to the electricity spot market, and combined with the theory of generalized energy storage efficiency, an embedded constraint model is constructed, including charging and discharging power boundaries, energy state temporal coupling, and terminal electricity demand. This enables quantitative modeling and unified scheduling of the flexibility resources of electric vehicle aggregators. Data cleaning and parameter normalization methods are used to map the characteristics of dispersed electric vehicle clusters to standardized virtual power plant parameters. State equation constraints are introduced into the traditional DC optimal power flow and unit combination model. Combining mixed-integer linear programming algorithms and dual pricing theory, the optimal coordination strategy between conventional unit output and electric vehicle charging and discharging is solved, and the low-cost clearing and nodal marginal price of the spot market are calculated. The method of this invention can improve the level of renewable energy consumption and the economy and security of grid operation.

The invention discloses a flexible superparaelectric energy storage thin film material and a preparation method thereof.The flexible superparaelectric energy storage thin film material comprises a flexible substrate layer, a buffer layer, a bottom electrode layer and a multiphase solid solution-superlattice layer which are sequentially stacked, and the multiphase solid solution-superlattice layer comprises a superlattice layer; the superlattice layer comprises BaTiO3 layers and SrTiO3 layers which are sequentially and alternately stacked on the bottom electrode layer, a first solid solution and a second solid solution are distributed in the superlattice layer, the first solid solution is BiFeO3, the second solid solution is Bi4-xNdxTi3O12, and x is equal to 0.1-1.5. The flexible super-paraelectric energy storage thin film material integrates the advantages of a multi-scale structure, has a ferroelectric hysteresis loop with almost no hysteresis, has excellent energy storage density and energy storage efficiency, and effectively improves the comprehensive energy storage performance of the flexible energy storage thin film material.

The invention discloses a magnetic element modified potassium niobate-based spiral electric polarization ceramic and a preparation method thereof. The chemical composition is (1-x) KNbO3-xFe2O3, wherein x is more than or equal to 0.0005 and less than or equal to 0.002. The preparation method comprises the following steps: weighing K2CO3, Nb2O5 and Fe according to a stoichiometric ratio, grinding, pre-sintering and ball-milling to obtain raw material powder, pressing the powder into sheets by using a mold, and sintering at 1030-1040 DEG C for 2 hours to obtain the iron element modified potassium niobate-based ceramic. The preparation method disclosed by the invention is simple in preparation steps, green, friendly and high in repeatability, has a spiral electric polarization characteristic similar to that of a liquid crystal material, and has the comprehensive performance ranges of high energy storage efficiency of 96.60-97.87% and breakdown field strength of 110-440kV / cm under different proportions. The lead-free functional inorganic material has great commercial application value.

The invention discloses an ultrahigh-temperature compressed air energy storage system and method, and relates to the technical field of heat energy engineering. The system comprises a compression energy storage subsystem, an expansion power generation subsystem, a heat regenerator and a fused salt heat storage loop. The compression energy storage subsystem comprises a compressor unit and a heat storage heat exchanger unit, and the expansion power generation subsystem comprises a heat release heat exchanger unit and an expansion unit which alternately operate in time; the heat storage heat exchanger set, the heat regenerator and the compressor set which are used for storing compression heat in the compression process, and the heat release heat exchanger set, the heat regenerator and the expansion set which are used for releasing heat to heat air in the expansion process can be integrated into the same physical equipment set. According to the invention, ultrahigh-temperature compression can be realized, a heat storage temperature area is perfectly matched with binary nitrate solar salt, a low-temperature heat storage system is omitted, the problems of low energy storage efficiency, complex system and high cost of existing compressed air are solved, step-type improvement of efficiency is realized, the system is simplified, and the cost is obviously reduced.

The utility model discloses a salt cavern gravity compressed air energy storage system which comprises a salt cavern, a vertical shaft is vertically arranged at the top of the salt cavern and communicated with the ground surface, a sealing film is arranged on the side wall of an inner cavity of the salt cavern and divides the salt cavern into a water storage cavity and an air storage cavity, and the bottom of the air storage cavity is connected with one end of an air pipe. A piston is arranged in the vertical shaft, a gravity block is arranged at the top of the piston, a water pipe communicated with the water storage cavity is arranged at the bottom of the water storage pool, and a water conservancy generator set is arranged on the water pipe. Liquid gravity is matched with salt cavern gas storage, liquid can be matched with the irregular shape of a salt cavern, construction is reduced, energy density is increased, meanwhile, sealing film damage caused by contact friction between a sealing film and the surface of the gravity block is avoided, and the service life of the sealing film is prolonged; and the hydraulic generator set can synchronously generate power, so that the energy storage efficiency is improved.

The invention provides a PEI-based multilayer dielectric composite film containing an inorganic interlayer and a preparation method and application thereof.The PEI-based multilayer dielectric composite film comprises a first layer body, a second layer body and a third layer body which are sequentially arranged in a stacked mode, the first layer body and the third layer body are polyetherimide films, and the second layer body is a polyetherimide film. And the second layer body is a ceramic fiber layer formed by sodium bismuth titanate nanofibers as an inorganic interlayer. The outer-layer pure PEI film provides a high eta value for the PEI-based multilayer dielectric composite film and ensures high breakdown field strength (Eb); the epsilon r value of the composite film is enhanced by the middle layer through the intrinsic high dielectric constant of the NBTNFs and micro interface polarization existing in the contact area of the NBTNFs and the PEI. The multilayer structure can effectively combine respective advantages of different layers, obtains high dielectric constant, high breakdown field strength and low dielectric loss, has high energy storage density and high energy storage efficiency, and can be suitable for various application fields.

The application provides an energy storage device, an energy storage module, an energy storage system, a charging network and a heat management method thereof. The energy storage device comprises an energy storage module, a heat exchange module, a heat dissipation module and a heat exchange pipeline assembly. The energy storage module comprises a plurality of battery devices. At least part of the heat exchange module is embedded in a ground source to exchange heat with the ground source. At least part of the heat dissipation module is exposed to an atmospheric source to exchange heat with the atmospheric source. The heat exchange pipeline assembly is used to circulate a heat exchange medium. The heat exchange pipeline assembly comprises a main heat exchange pipeline, a first bypass pipeline, a second bypass pipeline and a third bypass pipeline. The heat exchange module and the heat dissipation module can exchange heat with the battery devices. The energy storage device provided by the application has low operating power consumption, thereby effectively improving the energy storage efficiency of the energy storage device.

The utility model discloses a distributed photovoltaic power generation energy storage device, which relates to the technical field of photovoltaic power generation, and comprises a plurality of support columns, a plurality of main beams, a ceiling frame and a plurality of photovoltaic panels, a cleaning system is further mounted on the ceiling frame, a diversion trench is further arranged at one end of the ceiling frame, a hydraulic cylinder is arranged between each support column and each main beam, and the hydraulic cylinders are connected with the photovoltaic panels. The two ends of the hydraulic cylinder are rotationally connected with second fixed hinged supports, and the two second fixed hinged supports at the two ends of the hydraulic cylinder are fixed to the bottom face of the main beam and the side face of the supporting column correspondingly, light energy conversion and electric energy storage are integrally designed, photovoltaic conversion energy storage is achieved, and power supply of a load is facilitated; the cleaning system is additionally arranged on the photovoltaic panel, accumulated dust or sundries on the surface of the photovoltaic panel can be cleaned in the long-term use process of the photovoltaic panel, the long-term light receiving effect of the photovoltaic panel is ensured, inclination angle adjustment can be conducted on the photovoltaic panel in a specific time period, the light receiving performance of the photovoltaic panel is ensured, and therefore the photovoltaic power generation energy storage efficiency is improved.

The application relates to the technical field of compressed air energy storage, and discloses an energy storage method and system for compressed air in an aquifer, which can select the most suitable aquifer for storing the excess power of a compressed air storage power plant according to the actual state of the aquifer when the excess power needs to be converted into compressed air and stored in the aquifer, ensures that the energy storage efficiency is relatively high, reduces energy loss, and reduces the cost; in addition, the suitable energy storage mode can be selected according to the actual aquifer state of the final energy storage aquifer, the energy conversion efficiency coefficient is ensured to be low, the operation cost is reduced, and the overall energy utilization efficiency is ensured.

This invention relates to the field of flow battery technology, specifically disclosing a flexible graphite bipolar plate with high surface conductivity, its preparation method, and its application. The preparation method includes the following steps: (1) chemically and thermally treating flake graphite to obtain expanded graphite sheets; (2) spraying a PEDOT:PSS solution onto the first layer of expanded graphite sheets, then laying a second layer of expanded graphite sheets, and pre-pressing to obtain an EG-PEDOT:PSS composite material; (3) impregnating the EG-PEDOT:PSS composite material with an epoxy resin solution, and performing water bath curing and drying treatment to obtain a PEDOT:PSS-EG-EP composite material; (4) using a hot-pressing molding process to obtain a flexible graphite bipolar plate with high surface conductivity. This invention improves the overall conductivity of the graphite bipolar plate and enhances the energy storage efficiency of flow batteries.

The application belongs to the technical field of lead-free energy storage ceramics, and discloses a sodium bismuth titanate-based lead-free energy storage ceramic and a preparation method. 0.47 Na 0.47 Ba 0.06 )TiO3 matrix, and the ceramic can release energy storage density and energy storage efficiency which are significantly improved, and has high breakdown field and good temperature stability, and the comprehensive performance is better than that of the same kind of material prepared by a conventional solid-phase method in the prior art. 0.06 1‑x Sr x (Ti 1‑x Mg x / 3 Nb 2x / 3 )O3, wherein 0.06≤x<0.18. The preparation method comprises the following steps: mixing raw materials, performing first ball milling, drying, pre-sintering, performing second ball milling, drying, forming, degumming, and finally performing segmented sintering; wherein the segmented sintering is: first heating to 1000 DEG C at a heating rate of 5 DEG C / min, and then heating to 1100-1150 DEG C at a heating rate of 3 DEG C / min and keeping the temperature. The application introduces Sr, Mg and Nb elements with different ferroelectric activities into the (Bi 0.47 Na 0.47 Ba 0.06

The application discloses a method for improving the efficiency of pumped storage by buoyancy energy storage, comprising a pumped storage system, a buoyancy energy storage unit, a monitoring and control unit, and a power transmission and transformer station unit, wherein the buoyancy energy storage unit comprises a floating body, a motor, an energy transmission and fixing assembly, the floating body has two motion states of diving and floating, and has two storage states of floating and bottom fixing; the floating body is fixed, floats or dives along with the water level of the water storage unit, and the potential energy of the floating body is converted into electric energy by the buoyancy energy storage unit; the power transmission and transformer station unit is connected with the motor, the power transmission and transformer station unit transmits the excess energy of a power grid and a wind-solar photovoltaic power grid to the pumped storage system, or makes the buoyancy energy storage unit convert electric energy into potential energy of buoyancy and store the potential energy of buoyancy, or transmits the electric energy generated by the buoyancy energy storage unit to the power grid. The application can improve the energy storage efficiency of the pumped storage system for various types of pumped storage modes.

The invention belongs to the technical field of ceramic materials, and particularly relates to a niobate-based lead-free dielectric energy storage ceramic material as well as a preparation method and application thereof. The chemical formula of the dielectric energy storage ceramic material is (NaNbO3) (1-x) [(Ba1 / 3Ca1 / 3Sr1 / 3) (Zr1 / 2Ti1 / 2) O3] x, and x is larger than or equal to 0.01 and smaller than or equal to 0.2. An entropy modulation component is introduced into a niobate system, a nano polar island is constructed, and reversible quick response of the ceramic material to an electric field is achieved. The electrical microstructure of the sodium niobate ceramic is optimized, so that the relaxation time distribution of the material is normalized, and a structural basis is provided for excellent electrical properties. High energy storage performance is achieved in a wide temperature range, the energy storage density is 12 J cm <-3 >, and the energy storage efficiency is 95%.

The invention discloses an electrode material based on a conjugated macrocyclic polymer and a preparation method and application thereof, and belongs to the technical field of battery materials, the electrode material is a conjugated macrocyclic polymer formed by condensation polymerization of an acyl-containing pillararene derivative and an N, N, N ', N'-tetra (p-aminophenyl) p-phenylenediamine ligand through Schiff base reaction. The electrode material based on the conjugated macrocyclic polymer provided by the invention can be applied to the field of organic zinc ion aqueous batteries in practical application. According to the electrode material, through the synergistic effect of Faraday and non-Faraday dual-state energy storage modes, the performance limitation of a traditional electrode material is broken through, and higher energy storage efficiency and longer service life are provided. Besides, the electrode material not only can improve the rate capability of the battery under different current densities, but also can effectively prolong the cycle life of the battery, and has excellent electrochemical performance and stability.

The invention discloses a control method, device and equipment for an energy storage converter of an electric vehicle charging station and a medium, and the method comprises the steps: measuring reactive power and actual voltage through a voltage regulation module, and obtaining reference voltage; inputting the reference voltage into an inertia control module, and determining a reference frequency through the inertia control module based on Q-V droop control; the reference voltage and the reference frequency are sent to a double-layer current and voltage inner loop controller, and the output voltage is determined through the double-layer current and voltage inner loop controller; the output voltage is input into a DC / DC module, a battery charging and discharging instruction is determined through the DC / DC module based on P-f droop control, and the two-stage electric vehicle charging station energy storage converter is controlled through the battery charging and discharging instruction. According to the invention, Q-V droop control is utilized by the inertia control module, the output frequency is adjusted according to the deviation of the DC link voltage, and a power grid is supported through capacitance inertia in a network construction mode; and the DC / DC module detects the DC link voltage deviation, and the voltage proportion controller realizes P-f droop control to ensure that the DC link voltage is adjusted within an allowable safety range, so that the energy storage converter can adjust energy storage and energy release in time when the power demand changes, and the energy storage efficiency is improved. And instability and unreliability of power supply are improved.