1673 results about "Battery energy storage" patented technology

This invention relates to plug-in hybrid propulsion systems where the energy storage element of the hybrid drive train may be charged with externally supplied electricity as well as energy from the engine or regenerative braking. The invention is a plug-in hybrid system with a fast energy storage and delivery system. In a preferred embodiment the invention comprises a fuel powered engine, a battery, a fast energy storage system, power converters, controllers, drive motors, an electrical distribution system, and a drive train. Additionally, the invention relates to plug-in hybrids that provide services to the electrical utility when the vehicle is connected to the utility grid.

A method and Apparatus for solar energy storage system uses gas for thermal transport for central tower solar thermal electric power plant to provide high quality, low cost, and continuously electric power generation. The storage contains a number of storage modules that each module can store energy for a given period of time. The thermal energy from central tower charges the modules one by one during the sunny time, while the thermal electric power plant discharge the modules one by one as long as it works. A control and a connection valve system control and connect the charge and discharge modules with the central tower and the power plant according to pre-arranged sequences. Fans at the cool side of the storage system push the circulation gas into the central tower or the thermal storage modules. In the discharge system, the hot gas from storage system is send to the heat exchange system, and to generate steam and to super heat steam for the power plant. In the charge system, the cold gas is pushed into the central receiver thermal exchange unit and to be heated, and the hot gas is then circulated back to storage system to charge up the storage system.

A system and method for controlling a vehicle-based source of uninterruptable power is disclosed. The vehicle-based UPS includes an energy storage system located on-board a vehicle and configured to generate DC power transferable to an external load, and an DC-AC inverter connected to the on-board energy storage system to receive the DC power therefrom and invert the DC power to an AC power useable by the external load. The vehicle-based UPS also includes a charging device located on-board the vehicle and connected to the on-board energy storage system to provide recharging power thereto and a control system. The control system is configured to determine one of a state-of-charge (SOC) and a voltage of the energy storage system and selectively operate the charging device to provide the recharging power to the energy storage system to maintain the SOC or voltage of the energy storage system within a pre-determined range.

Prior battery-powered electric locomotives have used multiple diesel engines to charge the batteries and have not been commercially accepted. The present invention provides a yard switcher which combines battery storage with a gas microturbine generator to provide an effective fuel-efficient and environmentally friendly locomotive. locomotive.

Methods and apparatus for extracting stored thermal energy using a combined internal and external melt cycle are disclosed. The present invention relates, in one aspect, to a heat exchange system which uses both an internal melt cycle and an external melt cycle to extract stored thermal energy. The heat exchange system includes a thermal energy storage medium and a heat exchanger which is in communication with the thermal energy storage medium. The heat exchanger is arranged to hold a heat exchange liquid and to facilitate the indirect transfer of heat between the heat exchange liquid and the thermal energy storage medium. The heat exchange system further includes a fluid supply which provides a fluid which directly contacts the thermal energy storage medium to transfer heat between the fluid and the thermal energy storage medium.

A power generation plant with a compressed air energy storage system comprises a means to reduce the pressure of air extracted from a compressed air storage cavern for the use in a combustion turbine. The means to reduce the air pressure comprises at least one expansion turbine and means to control the size of pressure reduction. Furthermore, the expansion turbine is arranged on a rotor shaft that drives a generator. The means for pressure redact, according to the invention, avoid power losses and provide an increased overall efficiency of the power generation plant.

Disclosed is an intelligent power grid management system. In a certain area, an area-level minisize intelligent power grid system is established, which uses the common power supply of regenerative resources such as photovoltaic generation and wind power generation and the traditional power grid as the main power supply, the micro-turbine generation as the supplementary power supply, and the storage battery energy storage as the adjusting device; and comprehensively connects the power supply system with the distribution system of the area, the power utilization system of each building user. And then the intelligent power grid system including a generation and energy storage side management system as well as a power utilization side management system is comprehensively managed by utilizing the network communication and the intelligent control as the nerve centre, thus effectively lifting the utilization rate of regenerative resources in the area, raising the reliability of the power supply network of the area, improving the intellectualization degree of the whole power grid of the area, effectively saving energy and improving the power utilization satisfaction of users.

The present invention relates to a monitoring and controlling system and method for megawatt level battery energy storage power plant, which includes a central monitoring and controlling module and local monitoring and controlling modules, between the two modules adopts real time and non real time communication parallel network structure to communicate with each other. The central monitoring and controlling module is configured to read the data of the battery energy storage power plant through the communication network, and store and manage the data, determine the total power demand of the battery energy storage power plant, determine all the power demand values of the energy storage substation, and send to all the local monitoring and controlling modules, calculate all the power demand values of the energy storage units, and send to the energy storage units, and then send all the power demand values of the energy storage units, real time and non real time data to the central monitoring and controlling module for unified storage and management. The monitoring system and method meets the requirements of cluster real-time rapid control and thousands of transmission data monitoring, and ensures the healthy operation of the battery to battery energy storage power station more security and stability.

The invention discloses a microgrid running optimization system and method based on power and heat combined dispatching. Running restrains such as the output force characteristic, start, stop and climbing of a distributed type generator set and the charge and discharge characteristics of power and heat energy storage are comprehensively considered, a microgrid power and heat combined dispatching model containing a fan, a photovoltaic cell, a combined heat and power generation system, an electric boiler, a fuel cell and an energy storage (electrical energy storage and heat energy storage) is built, the 0-1 mixed integer nonlinear programming method is adopted for solving the optimal output force and total running cost of all units in the network, and power and heat dispatching contrastive analysis is carried out on the system and a traditional separated generation and combined generation optimization model. In addition, the influences of the heat and power reliability difference on the running are analyzed and discussed, and therefore the heat and power dispatching module is more reasonable, comprehensive and universal.

A solar power system capable of storing heat energy and converting sun light to electrical power. The solar power system includes a solar collection system which gathers and transmits concentrated solar energy to an absorber/cavity. The thermal energy is extracted from the absorber/cavity via a fluid and transported to a heat conversion system. The heat conversion system uses the thermal energy to create electricity.

An electrical energy storage unit and control system, and applications thereof. In an embodiment, the electrical energy storage unit (which may also be referred to as a battery energy storage system (“BESS”)) includes a battery system controller and battery packs. Each battery pack has battery cells, a battery pack controller that monitors the cells, a battery pack cell balancer that adjusts the amount of energy stored in the cells, and a battery pack charger. The battery pack controller operates the battery pack cell balancer and the battery pack charger to control the state-of-charge of the cells. In an embodiment, the cells are lithium ion battery cells.

The invention discloses a dynamic power coordination control method for a battery energy storage system. The battery energy storage system comprises a plurality of power converters which supply power to a load and are connected in parallel for operation, and is characterized in that: the power converters connected in parallel for operation are divided into two types, and a master-slave control scheme is adopted, wherein one type comprises only one power converter which adopts a constant voltage constant frequency control mode and is called a master node, and the power converters of the other type adopt a constant power mode with a slight droop characteristic, and serve as slave nodes; generally, a power converter with a high capacity is selected to be the only one master node which is specified by an upper-layer monitoring system, and all the other power converters are the slave nodes; and under a stable state condition, active power and reactive power output by the power converters which serve as the slave nodes are set by a power instruction transmitted by the monitoring system, and the output power of the power converter which serves as the master node is dynamically regulated according to a load condition. The method adopting the master-slave control scheme has the advantages that: on the premise of sufficient power capacity, both the voltage stability and frequency stability of a micro-grid system are easily achieved, anti-load disturbance capability is high, and failure recovery time is short.

A compressed-air energy storage system according to embodiments of the present invention comprises a reversible mechanism to compress and expand air, one or more compressed air storage tanks, a control system, one or more heat exchangers, and, in certain embodiments of the invention, a motor-generator. The reversible air compressor-expander uses mechanical power to compress air (when it is acting as a compressor) and converts the energy stored in compressed air to mechanical power (when it is acting as an expander). In certain embodiments, the compressor-expander comprises one or more stages, each stage consisting of pressure vessel (the “pressure cell”) partially filled with water or other liquid. In some embodiments, the pressure vessel communicates with one or more cylinder devices to exchange air and liquid with the cylinder chamber(s) thereof. Suitable valving allows air to enter and leave the pressure cell and cylinder device, if present, under electronic control.

The invention relates to a battery energy storage system based power conversion system and a control method thereof. The power conversion system comprises a battery energy storage system, a bidirectional DC/DC (direct-current) converter, a grid-side current transformer, a filter circuit and an isolated voltage transformer. The battery energy storage system is in parallel connection with a direct-current bus of the grid-side current transformer through the bidirectional DC/DC converter; the grid-side current transformer, the filter circuit and the isolated voltage transformer are connected in sequence; and the isolated voltage transformer accesses to a power grid. The control method includes sequentially monitoring the battery energy storage system, the bidirectional DC/DC converter, the grid-side current transformer, the filter circuit and the isolated voltage transformer by a control circuit. Since the battery energy storage system utilizes battery cells connected in series and is in parallel connection with the common direct-current bus through the bidirectional DC/DC converter, circulation among battery packs is avoided, and capacity expansion of the system is facilitated. Further, by the aid of the monitoring control strategy for SOC (super capacitor state of charge) of the battery energy storage system and battery end voltage, excessive charge or discharge state of the battery energy storage system is avoided, service lives of the battery packs are prolonged, and comprehensive service cost is lowered.

The invention relates to a wind power station energy storage capacity control method based on particle swarm optimization. The wind power station energy storage capacity control method includes the steps of taking the interval reference value of the wind power station output power which is adapted to the dispatching cycle of a power grid as a foundation, taking the influence of the wind-abandoning energy of a wind power station and the lost energy of an energy storage system into consideration, taking the lowest costs of the energy storage investment and a wind and power operation system as target functions, establishing a policy model for energy storage capacity optimizing based on a storage battery energy storage system, and then applying the improved particle swarm optimization to solve the functions. By the aid of the wind power station energy storage capacity control method based on the particle swarm optimization, the wind power which is output under effect of the energy storage system can be output smoothly at intervals, so that effective connection between the energy storage system and the existing dispatching operation manner can be realized, and the best economic benefit can be achieved simultaneously.

The invention relates to a battery energy storage system peak clipping and valley filling real-time control method based on load prediction and belongs to the field of power system automatic control. The control method provided by the invention comprises the following steps of: firstly searching similar history daily load data, carrying out expanding short-term load prediction by adopting a linear regression analysis method, building a battery energy storage system peak clipping and valley filling real-time optimization model, solving the battery energy storage system peak clipping and valley filling real-time optimization model by adopting a dynamic programming algorithm, and obtaining the output power of a battery energy storage system at each moment. The control method provided by the invention comprises battery charging and discharging frequency constraint and discharge depth constraint in the real-time optimization model, is used for researching relation between battery life and the charging and discharging frequency and the relation between the battery life and the discharge depth and is beneficial to prolonging the battery life. Minimum load variance is taken as a target function, the peak-to-valley of a load curve can be reduced, the load curve is smoother while constraint conditions are met, and the peak clipping and valley filling application requirement can be met. Local part of the load curve can be smoother by adopting load smoothness constraint.

The invention relates to an optical storage alternating current and direct current hybrid micro-grid system and a control method of the system. The system and the method are characterized in that a hybrid micro-grid comprises an alternating current micro-grid subsystem, a direct current micro-grid subsystem and a power exchange control system; the alternating current micro-grid subsystem comprises an alternating current side photovoltaic power generation unit, an alternating current load and a grid-connected interface; the direct current micro-grid subsystem comprises a direct current side photovoltaic power generation unit, a storage battery energy storage unit and a high/low voltage direct current load; the power exchange control system comprises a two-way AC/DC power converter, a transformer, a micro-grid controller and a communication system, the storage battery energy storage unit is used for controlling direct current bus voltages, and P/Q control is adopted in the two-way AC/DC power converter. Under the stabilizing effect of direct current side energy storage, the direct current micro-grid subsystem conducts photovoltaic power generation and is connected to a large power grid through the alternating current micro-grid subsystem at constant power, and the photovoltaic utilization rate is increased. By means of the control method, the power supply reliability and economical efficiency of the hybrid micro-grid are effectively improved.

The invention provides a cooperative control method and system of a battery energy storage power source participating in secondary frequency modulation of a power grid. The cooperative control method comprises the steps of: mounting the battery energy storage power source in a regional power grid needing the cooperation; obtaining an ACE (Area Control Error) signal from an electric grid control center by a cooperative control module; participating in the secondary frequency modulation of the power grid by the battery energy storage power source, and then dividing a typical application scene to determine the chance and participating degree of participation in the frequency modulation; converting a theoretical frequency modulation command into a practical frequency modulation command, then realizing charge/discharge control of the battery energy storage power source through an energy conversion system, and accordingly helping a traditional frequency modulation power source to finish a secondary frequency modulation process. The transient and steady performances of the secondary frequency modulation of the power grid are improved obviously, the frequent start of the traditional frequency modulation machine set is reduced, and balance between supply and demand of the power grid is maintained rapidly.

The invention relates to a liquefied compressed air energy storage system with cold-storage liquid media. The liquefied compressed air energy storage system comprises compressor systems, a cold storage system, a heat storage system, a liquefying system and a turbine power generation system. During energy storage, the multistage compressor system is driven by renewable energy sources, so that compressed air is supercharged to exchange heat with a room-temperature cold-storage liquid medium, the cold quantity stored in the liquid medium is lowered to liquefying temperature, and the compressed air is liquefied through throttling; during energy releasing, the liquid air is supercharged to exchange heat with a high-temperature cold-storage liquid medium, the medium recycles cold energy to give to the liquefying process, and the air is warmed to be vaporized; room-temperature high-pressure air is input into a multi-stage turbine expander for acting, and a power generator is driven to output electric energy; the heat storage system reduces the power consumption of the next stage of compressor, and the stored heat is heated step by step before expansion to raise the intake air temperature; a cold-storage medium with a low freezing point and a high/low boiling point recycles the cold energy of the liquid air, the specific heat capacity of the liquid media is large, and the large-temperature-span heat exchange is realized. The liquefied compressed air energy storage system has the advantages of being simple in structure and stable in performance, can realize integration of energy storage and power generation, and can realize the large-scale grid-connection of renewable energy generation, therefore improving the capacity of a power grid accepting new energy power generation.

The invention discloses a compressed air energy storage system, which comprises a compressor unit, a pre-expansion device, a turbine expansion machine, an intermediate cooler, an electric motor, a power generator, a hot water storage tank and a cold water storage tank, wherein the system utilizes electric energy which is not used up in the user electricity consumption valley period or wind power station power generation peak period for driving the compressor unit to work, the air at the normal pressure is compressed to high pressure, in addition, the part of air with rich pressure energy is stored into a high-pressure-resistance hole, in addition, the stored high-pressure air is released in the user electric consumption peak period or the wind power field generation valley period, an expansion unit is pushed to apply work, and the electric energy is output. The air pre-expansion device is additionally arranged at an outlet of an air storage chamber, so the air inlet pressure of the air turbine expansion machine is stable, the work stability of a power generation system is enhanced, low-temperature air at an outlet of the pre-expansion device is utilized for cooling hot water from the hot water storage tank, the temperature of the low-temperature air is raised through absorption of heat from the hot water, and the cooled water enters the cold water storage tank. The compressed air energy storage system is provided with the hot water storage tank and the cold water storage tank, the water is cyclically utilized in a closed loop, the water is not consumed, in addition, the heat discharged by the compressor is fully utilized and conveyed back to the high-pressure air at the outlet of the pre-expansion device. The high-pressure air at the outlet of the pre-expansion device is recovered through a heat recovering device (HRH).