133 results about "Smart microgrid" patented technology

A microgrid controller may control the generation, distribution, storage and use of electrical power on a microgrid. Embodiments of a microgrid controller may include inputs for different types of power (e.g. AC and DC) or power sources (e.g. wind and solar), an input for utility grid power, electrical equipment for conditioning the electrical power received from the multiple sources (e.g. rectifiers and inverters), outputs to multiple types of loads (e.g. three-phase AC and single-phase AC) and control circuitry designed to control the generation, storage, distribution and usage of electrical power on the microgrid. Embodiments of microgrid systems may include multiple types of electrical generation sources (e.g. wind, solar, electromechanical and fuel cell), multiple types of electrical loads (e.g. inductive and resistive), electrical storage units (e.g. batteries) and a microgrid controller.

The present invention relates to an energy resource-grid-load automatic control system of smart microgrid and control methods thereof, which belong to the field of microgrid control and electrical technology. The energy resource-grid-load automatic control system comprises a distributed renewable energy power generation module, a distributed renewable energy inverter module, a conventional power generation module, a user load module, a bidirectional grid-connected control module, a distributed renewable energy intelligent optimizing power generation control module, an energy storage module, an intelligent energy storage unit adjuster and a storage battery pack. Compared with the conventional microgrid comprising a distributed renewable energy power generation system, the present invention guarantees the stability and the high energy utilization of the power generation system and effectively solves the problem of non-uniform frequency of use of storage batteries to unify the service life of the storage battery pack.

The invention relates to a smart micro-grid system. The smart micro-grid system comprises a local control layer, a network communication layer, a master station layer and a software layer, wherein the local control layer is in communication with the master station layer through the network communication layer, and the master station layer is in communication with the software layer through an information interaction bus. The smart micro-grid system integrates photovoltaic power generation, wind power generation, multiple types of energy storage systems multiple in capacity and modern power electronic, communication and control technologies. While high-reliability power supply is achieved, optimized allocation of renewable energy resources and high-reliability power supply to loads in a micro-grid are achieved; the interaction relation between the micro-grid and an external power grid is reflected correctly, and the effect of distributed energy on improvement of power supply reliability is fully shown; operation data of photovoltaic, wind power and energy storage systems and the micro-grid systems can be collected and stored, and the operation data are accumulated for researches on key technologies about micro-grids. The smart micro-grid system solves the problems that an existing micro-grid system is low in energy utilization ratio and poor in environmental benefit, electric energy quality and power supply reliability.

The invention discloses a micro-grid system voltage stability control method based on robust control. The control structure of an intelligent micro-grid system is composed of a system control layer, a concentrated control layer and a local control layer, and energy optimization and voltage and frequency stability control of the micro-grid system are realized through multi-layer coordination control. According to the micro-grid system voltage stability control method based on robust control, a comprehensive load module of an induction motor is established, wherein dynamic loads are connected with static loads in parallel. On the premise that the constraint conditions of system performance and robust stability are met, a micro-grid voltage stability robust controller is designed by the adoption of a method of solving the problem of mixed sensitivity so as to improve the micro-grid voltage stability. The micro-grid system voltage stability control method based on robust control can be adapted to wide-range change of load parameters, has high robustness for the situations that due to the factors such as changes of running conditions, influences of external environment and frequency switching of the loads, perturbation is generated in model parameters of a micro-grid and uncertainty exists in the topologic part and the unmolded part and can better restrain parameter drift and noise interference, and meanwhile, the controller is simple in structure and easy to realize.

The invention discloses an intelligent electric meter (100), and the electric meter (100) comprises a central processor (101); a metering module (102) which is connected with the central processor (101) and is used for the bidirectional metering of the electric quantity; a blockchain module (103) which carries out the data interaction with the central processor (101), and is used for achieving thepoint-to-point power transaction between nodes in a blockchain network in a region and the storage of he distributed electric quantity metering and transaction data. The electric meter provided by the invention achieves the power transaction and recording through the blockchain module (103), and enables the final electric quantity information and point-to-point power transaction information to bestored in the blockchain network in a distributed and non-tampered manner. The electric meter achieves the distributed power generation and storage and the bidirectional metering of the power generation quantity and power utilization quantity of a power user, and achieves the metering, transaction and recording of the electric quantity of a distributed intelligent microgrid. A distributed power generation side and power utilization side serve as the basis of the transaction and charging through the intelligent electric meter, thereby enabling the microgrid to be more economically feasible.

The invention discloses an energy Internet router (100). The energy Internet router comprises a control module (101) used for energy exchange between a plurality of distributed energy stations and distributed energy users, routing management and point-to-point electric power transaction control in the same local area network; an acquisition module (102) connected with the control module (101) andused for acquisition of electric quantity measurement data of an electric meter (200); and a blockchain module (103) used for data exchange with the control module (101), realization of point-to-pointelectric power transaction between nodes in a blockchain network in an area, and distributed electric quantity measurement and storage of transaction data. The energy Internet router and the electricmeter are used in a combined manner, the electric power transaction and recording can be performed through the blockchain module, final electric quantity information and point-to-point electric powertransaction information are both stored in the blockchain network in a distributed manner and cannot be tampered, and measurement, transaction and recording of the electric quantity of distributed intelligent micro-power-grids can be realized.

The invention discloses an electric-energy optimal control method for an intelligent micro-grid with an energy storage device. The method comprises the steps that relevant parameters are initialized; global iteration is started, evaluation network weights and executive network weights are initialized; local iteration is started, an evaluation network and an executive network are trained by utilizing a self-adapting dynamic planning method, and neural network weights are corrected, wherein the evaluation network is used for approximating to an optimal performance index function, and the performance of the current battery control strategy is evaluated by utilizing the evaluation network weights; the executive network is used for approximating to an optimal control strategy and minimizing total cost in the primary global iteration; whether the current local iteration is completed or not is judged, if not, the local iteration is repeated, and if yes, an iteration performance index function and an iteration control law are updated to obtain the optimal solution; whether the current global iteration meets convergence precision or not is judged, if not, the global iteration is repeated, if yes, an optimal battery control strategy is obtained according to the optimal performance index function, and power utilization cost is calculated.

A method and system of optimizing microgrid operations is provided. One or more intelligent microgrid coordinators interface with the microgrid such that those microgrid coordinators are able to measure and control all microgrid asset activities. The microgrid coordinator is used to forecast the microgrid's demanded load more accurately, and assign asset commands so as to optimize microgrid consumption, generation, and storage of load. The method and system incorporate a valuation of dispatchable load in optimization functions. The microgrid coordinator is further used to protect the microgrid assets from over-current situations when the microgrid is connected to the bulk electric system and when islanded. The method and system provide a means to test the microgrid controller prior to implementation on the microgrid in order to assure proper operation.

The invention provides a laboratorial intelligent microgrid system based on various distributed power sources. The system comprises a primary system and a secondary system. The primary system comprises a photovoltaic power generation system, an energy storage system, a wind power system, a diesel power generation system and load equipment, wherein the photovoltaic power generation system is composed of a photovoltaic cell panel, a photovoltaic direct current distribution box and a photovoltaic inverter; the energy storage system is composed of a lithium battery pack and an energy storage bidirectional converter; the wind power system is composed of a vertical axis wind turbine, a horizontal-axis wind turbine, a vertical axis wind turbine controller, a horizontal-axis wind turbine controller and a wind power system distribution box; the load equipment comprises a bulb set, a load box, a motor and an electronic load. The secondary system is a control system of an intelligent microgrid. The laboratorial intelligent microgrid system is simple in structure, convenient to build, low in cost, and easy to implement, and has important engineering application value on research of microgrid system energy management optimization and security and stability control strategies.

The invention discloses a wind and light storage intelligent micro-grid economic dispatch control method. The method comprises the steps that 1, related running data is obtained through micro-grid running parameter data; 2, according to meteorological data, short-term power prediction is conducted on a distributed power supply in a micro-grid by means of a time-order character optimization model,and meanwhile a BP neural network model is utilized for conducting short-term power prediction on a load in the micro-grid; 3, on the basis of distributed power supply short-term power prediction, load short-term power prediction and energy storage system stage-of-charge and stage-of-charge threshold value of an energy storage system, and running modes of wind power, photovoltaic power generationand the energy storage system are determined; the purpose that the wind power and photovoltaic power generation can be consumed to the maximum extent is achieved, and meanwhile the technical effect ofbeing good in power quality and economical efficiency is guaranteed.

The invention discloses a micro-grid electricity energy storage and ice storage combined optimization scheduling method based on AC/DC load, cooling load and photovoltaic generating prediction result and electricity price information; the method takes the minimum electricity charge as the object, builds an optimization model for electricity energy storage charge and discharge state and refrigerating machine and ice storage tank cooling load distribution, solves the optimization model, and obtains the optical electricity energy storage charge and discharge strategy and refrigerating machine and ice storage tank cooling load distribution strategy. The method simultaneously considers electricity energy storage and ice storage combined optimization, can more effectively lifting energy usage effect and carry out peak-load shifting, thus saving electricity charges; the method can be applied to intelligent micro-grid optimization scheduling systems of various types.

The invention provides a mobile energy system which comprises that: a box type semi-trailer used for connecting with a tractor, wherein the box type semi-trailer has a case body; cell energy storage system which is provided in the case body of the box type semi-trailer. In the mobile energy system, preferably, the mobile energy system also comprises an energy storage bidirectional current transformer which is provided in the case body of the box type semi-trailer and is connected between the cell energy storage system and an external system to be connected. The mobile energy system has environment friendly performance with cleanness, no pollution, low noise and the like, construction and inconvenience problems of a present fixed charging/converting station are solved, and the system can be accessed to an intelligent micro-grid as a distributed power supply.

The present invention discloses an intelligent electricity meter system with a light wallet, including a CPU, a metering module, a blockchain light wallet module and a communication module. By using a blockchain light wallet module, the present invention solves the problems that the electricity meter in the prior art cannot implement the peer-to-peer electricity transaction, and electric quantity collection, transaction and recording of the distributed wind photovoltaic and storage battery, and the demand for the energy Internet big data cannot be met. The distributed electricity generation and storage as well as the bi-directional metering of electric energy production and electricity consumption of an electricity user are implemented, such that the electricity quantity of a scattered intelligent microgrid may be metered, transacted and recorded. The distributed electricity generation side and utilization side make the microgrid more feasible economically by taking the intelligent electricity meter as an evidence of transaction charge.

The invention discloses an intelligent micro-grid control system and an intelligent power consumption management method. The system comprises: a controller, a plurality of loop monitoring auxiliary machines, a server, an ammeter and a cell. The loop monitoring auxiliary machines respectively monitor each energy consumption equipment and read energy consumption data of the equipment loop. The controller controls a plurality of the loop monitoring auxiliary machines and transmits an energy consumption equipment running state obtained by the loop monitoring auxiliary machines and an energy consumption read value through the server. A user can read the data on a cloud platform through a computer or a mobile phone and carry out monitoring and management. When the energy consumption of the energy consumption equipment generates overload or abnormity, a warning message can be emitted so as to notify the user. Therefore, the user can grasp an abnormity state of energy consumption safety. The system possesses functions of energy consumption safety, energy consumption overload warning and energy consumption abnormity warning. Besides, a cloud service function is possessed. The running state data of each energy consumption facility can be transmitted to the cloud server. The user can remotely control the running and usage of the each energy consumption facility through an internet-connected device. The intelligent management can be realized.

The invention discloses a user customizable intelligent micro grid load control system. The system is characterized in that the system includes a micro grid load central controller, a user load controller, a user load management module, an intelligent line switch and an uninterrupted power source, wherein the micro grid load central controller is connected with the user load controller and the user load management module respectively through a micro grid load communication network, and the user load controller is connected with the intelligent line switch through the micro grid load communication network. The invention also provides a user customizable intelligent micro grid load control method. With the user customizable intelligent micro grid load control system and method of the invention adopted, a user can participate in the construction of a micro grid load control system and fine management of load; and a load removing mode can be adopted, and therefore, the energy difference of a micro grid can be flexibly configured, and the demands of more users can be ensured finitely in power shortage.

The invention belongs to the field of distributed power generation and smart grid control and relates to a microgrid topology and a corresponding on-load tap changer (OLTC) controller. The invention specifically provides a microgrid topology which can realize smart control of the microgrid comprising solar power generation units, wind power generation units, fuel cells, photovoltaic power generation units, direct current load units, alternating current load units and other units in combination with the contactless OLTC and a control method of the microgrid topology. The implementation process is as follows: the OLTC is utilized to realize connection between the microgrid and a large grid; the advanced smart reactive compensation control method is adopted for the DSP (digital signal processor) controller of the OLTC; and the frequency and voltage in the power quality indexes are used for establishing the joint optimal objective function to realize optimal control of the voltage regulation device OLTC and simultaneously realize optimal control of various power generation units and loads in the smart microgrid. The microgrid topology and corresponding control method provided by the invention have the beneficial effects of achieving static voltage regulation control of any node in the microgrid and realizing adaptive connection between the microgrid and the large grid.

The present invention discloses a generated power control system and control method for an intelligent micro-grid with a medium energy storage function. The control system mainly comprises: a wind-solar complementary power generation system, a photothermal generator set with the medium energy storage function, a micro-grid power control system, etc. The control method comprises: by a micro-grid power control center, receiving a power instruction transmitted from a micro-grid dispatching automation system in real time; collecting generated power of the wind-solar complementary power generation system in real time; and calculating a micro-grid optimal power allocation scheme by an energy management system. According to the power allocation scheme, by carrying out coordination control on heat storage of a heat storage system, a heat release rate, and the generated power of the photothermal generator set, stable output of the generated power of the micro-grid is achieved. According to the control method, technical defects of uncontrollability, discontinuity, large fluctuation adn the like of wind energy and solar generated power, which are caused by change of the external environment, can be overcome, the generated power of the micro-grid is stabilized, electric energy of new energy can be consumed to the greatest extent, and the problem of phenomena of ''wind curtailment'' and ''light curtailment'' in the new energy can be effectively solved.

The invention discloses fault diagnosing system and method for a wind generation set. The system comprises the wind generation set, a vibration sensor, a rotating speed sensor and a signal acquiring card and computer signal processing system. The method comprises the steps of (1), generating a vibration simulating signal of the wind generation set; (2) setting initializing parameters; (3) treating a zero crossing point of a baseband signal of a rotating shaft as a key phase signal of the actual wind generation set; (4) determining whether to conduct variable upper limit type anti-aliasing filtering tracking for a composite vibration signal; (5) re-sampling the time; (6) re-sampling vibration signal amplitude; (7) calculating time domain synchronizing average value; (8) repeating steps from (4) to (7); and (9) comparing different results above. The fault diagnosing system and method for the wind generation set have the advantages that the anti-aliasing filtering tracking effect is obvious, an effective data processing method is provided for the fault diagnosing of the wind generation set, and the safe connection of the wind generation set in a grid and the safe operation of an intelligent micro-grid with the wind generation set are ensured.

The invention discloses an intelligent micro-grid monitoring system and a monitoring method. Distributed energy sources and the characteristic of each piece of control equipment in an intelligent micro-grid are considered comprehensively, a monitoring management system is optimized, and safe and reliable running of a micro-grid is ensured. The framework of the monitoring system consists of three layers, wherein a first layer is a DG intelligent monitoring terminal which comprises a plurality of micro power controllers and a load controller; a second layer is a protection and coordination controller XT which comprises an intelligent micro-grid mode controller and an intelligent micro-grid central controller; a third layer is an MEMS (Micro Electro Mechanical System) for ensuring stable and economical running of an entire micro-grid system. The monitoring system and the monitoring method can be widely applied to an intelligent micro-grid project consisting of multiple distributed power supplies such as wind, light, gas turbines, firewood and storage, and are used for determining an optimized monitoring management system during projection construction plan.

The invention relates to a smart micro grid, and relates to the technical field of new energy. The smart micro grid comprises a control inversion system, an energy storage management system, a user end monitoring system, a solar energy collecting system converting solar energy into electric energy and a wind energy collecting system converting wind energy to electric energy; the energy storage management system stores the electric energy and supplies power to a DC load of a user; the user end monitoring system sends obtained DC and AC electric energy change information to the control inversionsystem; and the control inversion system controls the energy storage management system to supply power to the DC load of the user according to the DC electric energy change information, and accordingto the AC electric energy change information, changes DC converted by the solar energy collecting system and the wind energy collecting system into DC by inversion and supplies the AC to an AC load of the user and/or the power grid. Thus, influence on disturbance of the power grid and the user load is reduced greatly, and loss in the power transmission process can be reduced substantially.

The invention provides a double-bus direct current ultra-micro grid system suitable for a sustainable building according to the characteristics of Chinese buildings. A ultra-micro grid adopts a 380V and 48V double-bus structure to combine new energy source power generation, energy storage, combined heat and power generation, loads and control systems to form an intelligent micro grid, and the intelligent micro grid can work in the island and grid-connecting working modes; high voltage (380V) is used for driving a household high-power electric appliance, and low voltage (48V) is connected with miniature electronic equipment; an energy storage system adopts a supercapacitor and an electric automobile battery hybrid energy storage structure, and a house heat energy system is combined with an electric energy system by a combined heat and power generation system, a hot water tank and an electric heater, so as to realize the comprehensive management of energy. The double-bus direct current ultra-micro grid system has the advantages that by utilizing reasonable design and coordinated control, the quality of electric energy of the sustainable building can be improved; by combining the heat and power systems, the utilization efficiency of the energy source is improved; the distributed type new energy can be effectively utilized, and the functions of energy saving and emission reduction are realized.

The invention provides a smart micro-grid and relates to a technology of micro-grids capable of utilizing renewable energy sources. At present, large power grids have some obvious defects, for example the large power grids cannot follow changes of load flexibly and cannot supply electric power to remote areas ideally, partial accidents in the large power grids are easy to spread, and accordingly large-area power failure is caused. The smart micro-grid is an independent controllable system and is composed of a power generation unit, a power generation managing system, an energy storage unit, an energy storage managing system, a client distribution circuit, a client monitoring system, a central control unit, a remote monitoring system and an external access controller. For the power generation end, the smart micro-grid can be connected with renewable energy source power generation units of various types, a client is used for power generation more, and loss in transmission is little. For the client, the client can react in a short time so as to meet the requirements of load in the smart micro-grid, and meanwhile the requirements of users for the power quality are met.

The invention relates to a micro-grid operation method for stabilizing the fluctuation of wind and light power by an energy storing device, belongs to the technical field of intelligent micro-grids, and aims to solve the problems that the output power with fluctuation, randomness and intermittence of wind power generation units and photovoltaic power generation units of a current micro-grid influences the stable operation of the micro-grid. The micro-grid operation method specifically comprises the following steps: determining structure parameters and operation parameters of a micro-grid according to a micro-grid system; selecting active output of each distributive power supply and power of electricity bought from or sold to a large power grid of the micro-grid as control variables, and obtaining an operation cost function of the micro-grid according to the control variables, wherein the operation cost function is taken as a target function of operation of the micro-grid; obtaining a mathematic model of the energy storing device for stabilizing the fluctuation of wind and light power and a constraint condition of operation of the micro-grid according to the target function; and obtaining a micro-grid operation method adopted after the fluctuation of power is stabilized by an improved differential evolutionary algorithm. The micro-grid operation method is applied to the micro-grid system.

The invention discloses a hundred-megawatt level heavy type flywheel energy storage system based on gas magnetic fluid float cylinder suspension. The hundred-megawatt level heavy type flywheel energy storage system based on the gas magnetic fluid float cylinder suspension comprises a heavy type flywheel, a rotating shaft, a driving unit and an output unit. A float cylinder is arranged on the rotating shaft, and the float cylinder is one separation or combination of an air cushion float cylinder, a magnetic suspension float cylinder and a fluid float cylinder. The float cylinder is added on the rotating shaft, load bearing capability of the rotating shaft is improved, and the problem that a heavy type flywheel can not be adopted by an existing flywheel energy storage system is solved. The hundred-megawatt level heavy type flywheel energy storage system has the advantages of being high in energy storage efficiency, strong in dilatation capability and wide in energy storage scale, and has the advantages of being high in power density, long in service life, limitless in charge-discharge times, free-of-pollution and the like as traditional flywheel energy storage technology. The hundred-megawatt level heavy type flywheel energy storage system simultaneously is low in construction requirement, is mainly used in flat suppression fluctuation and smooth grid-tied, can be used for constructing of a super-large scale energy storage pitch peak power station, and can also be used as a distribution type intelligent microgrid energy storage core.