37results about How to "Enable energy management" patented technology

The invention discloses a fuel cell forklift hybrid power controlling system with the function of online monitoring, belonging to the technology of control of the fuel cell forklift. As the fuel cells and lithium cells of the existing fuel cell forklifts have difficulty in playing the best performances, the system provided by the invention uses the structural form where three energy sources of a fuel cell, an auxiliary lithium cell and a super capacitor are configured, uses the fuzzy control to implement energy management and uses the wireless transportation technology such as an embedded system technology, a GPS (global positioning system) technology, a CAN (controller area network) bus management technology and a CDMA (code division multiple access) technology to control and adjust the working performances of the fuel cell and the lithium cell, so as to achieve the best performances of the fuel cell and the lithium cell. The system provided by the invention has the functions of controlling the performances of the fuel cell, managing the energy output, managing the energy of the lithium cell, managing the outputs of multiple energies and wirelessly monitoring the running state of the fuel cell forklift. The system provided by the invention completely solves the problem that the original domestic hybrid power causes pollution.

The invention provides an isolated island microgrid real-time schedule energy management system which comprises an energy management unit, a real-time monitoring unit, a prediction control unit and a distributed unit circuit breaker. A microgrid comprises power generating units, a battery and a load, wherein the power generating units, the battery and the load are respectively connected with a power bus through a power converter. The real-time monitoring unit acquires the running state of each power generation unit and the battery. The prediction control unit predicts the output power and the load demand of each power generation unit according to current weather information data and historical load data. According to received microgrid running data and prediction result data, the energy management unit calculates the running state and the output power of each power generation unit of next time by taking the minimum system running cost as an objective function and safe system running as a constraint condition. Accordingly, the distributed unit circuit breaker controls each power generating unit to transmit power to a power grid. According to the invention, the influence of uncertain factors of weather conditions, load fluctuations and the like on the running of the system can be reduced, and the running reliability of the microgrid is improved.

The invention discloses a microgrid energy management method and a system thereof. The microgrid energy management system comprises a super-capacitor energy storage management module, a grid-connected energy storage management module, an off-grid energy storage management module and an off-grid power generation and load management module. An energy management module operates based on difference between generation power and load power in a microgrid, a super-capacitor energy storage management module enables a high-frequency part in power difference values in the microgrid to be contained in a power set value of a super capacitor to the maximum extent, the grid-connected energy storage management module sets powers of all stored energy in the microgrid according to a stored energy surplus capacity weighting allocation algorithm and a stored energy charging and discharging power set curve, the off-grid energy storage management module sets other stored energy except main stored energy according to the charging and discharging power curve, and the off-grid power generation and load management module controls power source and load in the micro grid according to a grid-connected management strategy or an off-grid management strategy.

The invention discloses two kinds of non-isolation type single-magnetic-core three-port direct current converters. Each of the two kinds of the converters comprises an input source port, a battery port, a load port, a first switching tube, a second switching tube, a third switching tube, a first diode, a second diode, a third diode, a filter capacitor and a filter inductor, and has five kinds of working patterns, wherein the four working patterns have three working modes. According to the converters provided by the invention, the converters are connected with the corresponding input voltage sources, the loads and the batteries; single-stage energy conversion is performed among the ports; the converters have multifunctional unified energy management modes and higher efficiency; the same working pattern can be carried out by different working modes, so that limitation to the port voltage is low; and in addition, the converters are wide in operating range and flexible in working modes.

The invention provides an industrial energy storage system for time-of-use electricity price, which is mainly composed of a battery pack, a battery management system, a bi-directional converter, an energy manager, an electric meter and a high-voltage box. In areas where time-of-use tariffs exist, the industrial energy storage system realizes the commands of charging the valley or flat-section battery packs and discharging the cusp or peak-section battery packs under the premise of meeting the energy balance among the commercial power, energy storage and load through the dispatching function ofthe energy manager, thereby achieving the purpose of reducing the power consumption cost. The invention also provides a charging and discharging strategy of the energy storage system.

The invention discloses a photovoltaic energy storage generating module based on Lyapunov switch coupling extremum searching. The photovoltaic energy storage generating module comprises a photovoltaic battery unit interface, a photovoltaic battery voltage equalization unit, an SEPIC feed buck-boost conversion unit, a lithium ion battery unit interface, a switching unit and a main control unit, wherein the SEPIC feed buck-boost conversion unit is connected with the photovoltaic battery voltage equalization unit in series; the switching unit is connected with the SEPIC feed buck-boost conversion unit and a lithium ion battery unit; and the main control unit is connected with the switching unit and a 2-Lyapunov extremum searching MPPT control sub unit. The 2-Lyapunov extremum searching MPPT control sub unit comprises a front-stage photovoltaic voltage equalization Lyapunov extremum searching MPPT control sub unit used for carrying out extremum searching on the photovoltaic battery voltage equalization unit, and a rear-stage SEPIC feed buck-boost Lyapunov extremum searching MPPT control sub unit used for carrying out extremum searching on the SEPIC feed buck-boost conversion unit. The front-stage photovoltaic voltage equalization Lyapunov extremum searching MPPT control sub unit and the rear-stage SEPIC feed buck-boost Lyapunov extremum searching MPPT control sub unit carry out extremum searching alternately.

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 discloses an energy regulating and controlling method of a DC micro power grid. The DC micro power grid mainly comprises various load units, a storage battery energy storage unit, distributed generating units, a static switch, various converter interfaces, and a grid-connected current transformer. A mode A means that when a power grid operates normally, the DC micro power grid is in a grid-connected operation mode; the grid-connected current transformer controls DC bus voltage to be constant; the distributed generating units operate in respective maximum power tracing modes; and the storage battery energy storage unit operates in a droop control mode. The specific structure of the DC micro power grid and five modes for achieving system operation are disclosed in the invention. The energy management of the five modes uses specific mode transformation strategies. In order to guarantee smooth switching processes among the five modes and prevent frequent switching among the five modes, mode switching uses a hysteresis comparator. The energy regulating and controlling method of the DC micro power grid may effectively achieve power grid energy management and coordination control.

The invention discloses a hybrid multi-port railway power converter and a power coordinated control method thereof. Firstly, according to the power and load power provided by the new energy, the powerrequired for compensation by a railway power regulator is calculated, and a three-phase traction network reaches the active balance. Secondly, a preceding-stage back-to-back PWM rectifier adopts theimproved virtual synchronous machine control to realize the negative sequence and reactive power compensation, stabilize the high-voltage side series DC voltage, and meanwhile, can suppress the grid voltage fluctuation and improve the power supply reliability of the traction network. Thirdly, a intermediate-stage DC/DC converter adopts a stable low-voltage bus voltage, controls the voltage and power balance of a high-voltage series terminal at the same time, and introduces variable parameter control according to a small-signal model to enhance the dynamic performance of the control system andimprove the adaptability of control parameters.

The invention provides a bidirectional interactive type direct current ultra-micro grid system with a combined heat and power generation system suitable for a sustainable building according to the characteristics and requirements of Chinese buildings. A ultra-micro grid adopts a direct current bus to combine new energy source power generation, supercapacitor energy storage systems, combined heat and power generation, loads and control systems to form an intelligent micro grid with the advantages of little pollution, high utilization rate of energy source and flexible mounting place, and the intelligent micro grid can work in the island and grid-connecting working modes; the ultra-micro grid can be accessed into an alternating current power grid through a bidirectional AC-DC (alternating current to direct current) converter, so as to realize the bidirectional flowing of the power; 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 is realized. The bidirectional interactive type 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 embodiment of the invention provides a control system and method for a photovoltaic medium-voltage distributed control system. The photovoltaic medium-voltage distributed control system comprisesN photovoltaic modules, N direct current-direct current converters, a direct current-alternating current converter and an industrial frequency transformer, wherein output ends of the N direct current-direct current converters are connected to a direct current bus in parallel; the direct current bus is connected with the direct current-alternating current converter; and the industrial frequency transformer is used for being connected with a medium-voltage alternating-current power grid. The control system comprises a bus voltage sampling circuit and N direct current-direct current converter control circuits in one-to-one correspondence with the N direct current-direct current converters, wherein each direct current-direct current converter control circuit includes a bus voltage sampling circuit, a photovoltaic sampling circuit, a droop controller, a maximum power point tracking controller, an input voltage loop regulator and a pulse width modulation wave generation circuit. The direct-current bus voltage is used for replacing a signal line for communication, a communication system can be greatly simplified, and reliability of the control system is improved.

The invention discloses a vehicle energy management method and device, a vehicle and a storage medium, and the method comprises the steps: determining the preset output power and a first correction parameter of a fuel cell according to the state of charge and the current temperature of a power battery; if the preset output power is greater than the first correction parameter, correcting the outputpower of the fuel cell based on the first correction parameter to obtain corrected output power; and controlling the vehicle to operate based on the corrected output power and the state of charge torealize energy management of the vehicle. According to the method, the output power of the fuel cell is corrected under the state of charge of the power cell and the current temperature, then the vehicle is controlled to run, energy management of the vehicle is achieved, the fuel cell runs under the required output characteristic on the premise that the power requirement of the whole vehicle is met, the power cell cannot be overcharged, and the service life of the fuel cell and the safety of the vehicle power supply network are improved.

The invention belongs to an aircraft digital control electronic hydraulic servo system, and discloses an integrated electronic hydraulic servo system. According to the integrated electronic hydraulic servo system, a servo battery is activated by a control instruction to work and provide electric energy to a servo control drive; a direct-current brushless motor receives an instruction of the servo control drive to drive a plunger pump to operate; the servo control drive adopts energy high pressure as a control capacity, the output capacity of the plunger pump is adjusted by changing the rotation speed of a motor in real time, electronic hydraulic energy high-pressure closed loop control is achieved, and thus the purpose of energy power management can be achieved. After an oil pump is operated, high-pressure oil is divided into three paths, namely, one path flows to the oil cavity of an energy accumulator to store high-pressure oil in advance; a second path is introduced to the inlet of a high-pressure safety valve, and the high-pressure safety valve can be started to release the pressure if a servo mechanism energy control management loop has faults and the pressure of the high-pressure cavity is increased; a third path is used for providing oil supply paths for four servo actors through high-pressure connectors, the flow of the third path is controlled by a servo valve, and low-pressure oil is fed back to an oil tank through a low-pressure path after action of the servo actors.

The invention discloses a distributed multi-power supply airport intelligent microgrid system, which comprises a distributed multi-power-supply module, an intelligent control module and a centralizedcontrol background, the distributed multi-power-supply module comprises a solar energy power supply sub-module, a wind power supply sub-module, a mobile energy storage power supply sub-module, a fixedenergy storage power supply sub-module, a local power grid power supply sub-module, a water conservancy power supply sub-module, a garbage power generation power supply sub-module and a diesel generator power supply sub-module. The intelligent control module comprises a solar power supply control sub-module, a wind power supply control sub-module, a mobile energy storage power supply control sub-module, a fixed energy storage power supply control sub-module, a local power grid power supply control sub-module, a water conservancy power supply control sub-module, a garbage power generation power supply control sub-module and a diesel generator power supply control sub-module. According to the invention, airport power quality can be effectively improved, electric energy is integrated and fully utilized, power supply pressure during peak hours of power utilization is relieved, reliability and safety of a power supply system are improved, and effective management of the airport power supply system is realized.