912results about How to "Guaranteed power supply" patented technology

The invention relates to a method, a device and a system for configuring a power supply system. The method comprises the following steps of distributing a total available power to each power supply apparatus according to an initialization distribution strategy; monitoring the variable attribute of the power supply system; when the change of the variable attribute is monitored, ordering all ports according to the priority level of each port on each power supply apparatus, sequentially accumulating the needed power of each port according to the sequence of the ports, respectively counting the needed power of each power supply apparatus, and redistributing the total available power to each power supply apparatus according to the needed power. The device comprises an initialization distribution module, a monitoring module, an ordering module and a power distribution module for realizing the method. The system comprises the configuration device for the power supply system as well as a power module and a power supply apparatus. In the invention, after all ports on each power supply apparatus are completely ordered, the total power of the power source is redistributed according to the needed power, thereby ensuring the power supply of the high priority port, realizing the distribution according to the needs and saving power.

The invention discloses a section power supply and status measurement and control method of parallel-connected traction networks at the tail end of a double track railway. By taking the section (10km) of the railway as a unit, a contact line sectioning and a sub-section post are additionally arranged at a section boundary. The sub-section post comprises a circuit breaker, a current transformer, a voltage transformer and a measurement and control unit. The circuit breaker and the current transformer connected with the circuit breaker in series are in bridge connection with the two ends of the contact line sectioning, and the sectioning is series-connected in the contact line. Through the arrangement of the sectioning and the sub-section post and the introduction of running status criterion, the running situation of charging trains on the traction networks can be timely and accurately mastered by operators on duty in a traction substation or dispatching room; by using the fault criterion, various faults can be timely and accurately found, distinguished and isolated, the continuous power supply and running of fault-free sections are ensured, the power outage scope is reduced to the maximum extent, and further the reliability of power supply of the traction networks is improved. The device has less investment and is easy to implement, not only is conveniently used by a new line, but also facilitates the transformation of an existing line.

The invention discloses an orderly charging control method, controller and system. The orderly charging control method is suitable for direct-current charging piles and includes: and includes: acquiring real-time load of a station transformer, real-time charging demanded power of vehicles and real-time running condition of the charging piles; on the premise that the load of the station transformerdoes not exceed a limit, formulating an orderly charging strategy, and issuing the same to the charging piles, wherein the orderly charging strategy includes: charging the vehicles according to preset priority and preset output power of the charging piles if total charging demanded power of the vehicles does not exceed current residual power of the station transformer; when the total charging demanded power exceeds the current residual power, the charging piles with higher priority work at full power in a prioritized manner, and the charging piles with lower priority charge through power smooth adjusting. By the method, orderly charging of electromobiles is realized, and matching between charging load of the electromobiles and power supply capacity of a power distribution network is realized through orderly charging control by utilizing the characteristic of energy-type load of the electromobiles, so that power supply of the electromobiles and running safety of the power distributionnetwork are ensured.

The invention relates to a distribution network coordination control system taking account of distributed power, comprising a main control, a simulation display screen, thirteen groups of mutual inductors, nine groups of distributed switch control terminals, two groups of distributed power installation control terminals, two groups of distributed energy-storing device control terminals, two groups of distributed power installations, two groups of three-phase inversion devices, two groups of energy-storing devices and two groups of charging / inversion devices. The invention enables the distribution system to possess a run state coordinating the distributed power in the network, thereby realizing the capability of making the clean energy utilization rate maximization in the network. By the invention, the run state of the distributed power is coordinated and optimized to realize that the load tracking rate of the clean energy reaches more than 70%, meanwhile, avoid the impact to the distribution network due to any network connection / disaggregation of the distributed power; when the distribution network occurs an extreme accident, i.e. the distribution network occurs an isolated island running situation, the distributed power and the energy-storing devices are coordinated to run at the largest power, thereby guaranteeing that the important loads in the network are in normal power supply, and solving the power supply problem of the distribution network when the extreme accident occurs.

The invention discloses an ice and snow removing device of a power transmission line. The ice and snow removing device is arranged on an overhead line, wherein a box body of the ice and snow removing device is internally provided with a scrapping plate, a hairbrush assembly, a heating belt sleeving the external part of the overhead line, an upper ice removing wheel and a lower ice removing wheel. Under the driving of a driving mechanism, the ice and snow removing device moves on the overhead line through a pulley set. Gears of the upper ice removing wheel and the lower ice removing wheel form certain extrusion forces to coating ice, and circumferential ice removing sharp teeth remove the coating ice on the power transmission line, so that rapid ice removing is realized; in addition, the heating belt is used to heat the external part of the overhead line, so that ice removing is convenient. The scrapping plate and the hairbrush assembly are capable of clearing scattered ice and accumulated snow on the overhead line, and in this way, the ice and snow removing device can effectively removing the coating ice and the accumulated snow on the overhead line, reduce the pressure caused by the e coating ice and the accumulated snow and ensure the normal power supplying in an icy and snowing day.

The invention discloses a external-insulation dry-ice cleaning system for electrical equipment, which belongs to the technical field of the external-insulation dirt removal of electrical equipment of an electrical system. The external-insulation dry-ice cleaning system adopts the structure that a dry-ice particle spray nozzle (1), an insulating adjustable bracket (2), a dry-ice transmission insulating pipe (3), a dry-ice cleaning device (5), an air compressor (6) and an air dryer (7) are sequentially connected with each other front and back, wherein the dry-ice particle spray nozzle (1), the insulating adjustable bracket (2), an insulating bracket regulating lever pipe (4) and a bracket regulating power device (8) are sequentially connected with each other from front and back, a dry-ice making granulating machine (10) is connected with a liquid carbon dioxide storage tank (11), a dry-ice insulation can (12) is independent equipment, and an earthing base (9) is taken as a safe earthing pedestal of the external-insulation dry-ice cleaning system. The invention has high dirt removing efficiency, is suitable for the on-line cleaning of an insulating sleeve and an insulating mainstay or an erected transmission line insulator inside a transformer station, and is an effective measure for safely generating the electricity and ensuring the electricity supply.

The invention discloses a micro-grid modular energy storage device optimal configuration and control method. The method comprises the steps that 1) energy storage power is configured; 2) the capacity of an energy storage battery is calculated; 3) the energy storage battery is selected according to an actual energy storage battery type selection principle; 4) during the operation of a micro-grid system, the charge-discharge state and the charge-discharge value of an energy storage system are established according to the output value of each distributed power supply and the conditions of the SOC and SOH of the energy storage battery; and 5) grid-connection and off-grid switching needs to be carried out, a seamless switching mode is used, and specifically off-grid to grid-connection, planned off-grid and unplanned off-grid are seamlessly switched. According to the invention, the method describes a whole set of solutions of an energy storage unit in the micro-grid, and has the characteristics of typicalness, operability and the like.

Disclosed is a power distribution network fault handling method based on self-recovering control. By a centralized and distributed coordination power distribution network fault self-recovering control method, signal processing and control strategy generation are adaptive, the control process is automatically completed without manual intervention, and behaviors of a relay protection device and a protection control device, a switch and an intelligent switch, and an automatic safety device are coordinated. The power distribution network fault handling method includes the steps of automatic detection of power distribution network faults, distributed self-recovering control and centralized self-recovering control.

The invention relates to a street lamp generating device, which is safe in use and energy-saving. The device comprises a generator for providing power and a vibration generating structure connected with the generator through a rotating shaft and is characterized in that the vibration generating structure comprises a vibration-sensing working subassembly which is capable of moving up and down under the action of the outside vibration force, a flywheel arranged on the rotating shaft of the generator and a transmission mechanism connecting the vibration-sensing working subassembly and the flywheel. Under the action of the outside vibration force, the vibration-sensing working subassembly moves up and down and drives the flywheel to rotate by the transmission mechanism for electricity generation of the generator. The vibration-sensing working subassembly which is capable of moving up and down, the flywheel for driving the rotating shaft to rotate and the vibration generating structure formed by connecting the vibration-sensing working subassembly and the transmission mechanism of the flywheel and the like are arranged on the generator; therefore, the device can generate electricity by directly using the vibration force around the street lamp, is safe in use and energy-saving, and has convenient mounting, reliable structure and long generating time.

The invention belongs to the technical field of unmanned aerial vehicles and discloses a rotorcraft double-mechanical-arm target positioning and grabbing system and method. The rotorcraft double-mechanical-arm target positioning and grabbing system comprises a rotorcraft, an airborne computer, a double-mechanical-arm system, a flight controller, a power supply, a communication integrated circuit module and a visual sensor. The rotorcraft double-mechanical-arm target positioning and grabbing method comprises the steps that environmental video stream information is obtained in real time throughthe visual sensor, and a MobileNet-SSD model is adopted to train target recognizing and grabbing; a depth camera and AprilTag visual positioning are used in a switched mode so as to precisely obtain three-dimensional coordinate information of a recognized target; and FCL collision is introduced, and inverse kinematics operation of the mechanical arms are conducted through an RRT_Connect path planning algorithm, and thus spatial collision-free double-arm planning and grabbing are completed. According to the rotorcraft double-mechanical-arm target positioning and grabbing system and method, theability of an unmanned aerial vehicle to interact with the external environment can be effectively improved, and the autonomy property and accuracy of the rotor unmanned aerial vehicle from target recognizing, motion planning to stable grabbing is improved.

The invention discloses an optimization method of the day-ahead unit commitment of a thermal power system of a thermal power plant capable of operating under multiple states. The optimization method comprises the following steps: firstly, predicting the total power generation load of the system and the heat supply load of each thermal power plant on the next day; then, taking the minimum total power generation coal consumption of thermal power system on the next day as a target, and taking a situation that power supply and thermal energy supply are satisfied as a condition to establish an optimization model of the thermal power system unit commitment by simultaneously meeting constraints including the reserve requirements of the thermal power system, the electrothermal coupling characteristics of an extraction steam turbine of the thermal power plant and the thermal characteristics of a thermal storage tank; and finally, using an optimization algorithm to calculate to obtain a startup-shutdown plan of each thermal power unit, a power generation and steam extraction plan of a steam turbine of a heat supply unit and a thermal charging and discharging plan of the thermal storage tank in the thermal power plant on the next day so as to guarantee the economic operation of the thermal power system.

The invention relates to a single-phase earth fault direction judgment and processing method of a small current grounding system. In terms of a fault direction judgment method, the session which a single-phase fault point belongs to on a main line is judged according to zero-sequence currents, zero-sequence voltage and the included angle relation between the zero-sequence currents and the zero-sequence voltage tested through a section switch on the main line where a single-phase earth fault occurs, the fault session is isolated according to the judgment result, and normal power supply of a non-fault session line is guaranteed to the largest extent. According to the judgment and processing method, the single-phase earth fault session of the main line can be automatically isolated, and power supply reliability of a power distribution network is improved; additionally, according to the single-phase grounding direction judgment method, a main line boundary function is embedded in the section switch of a 10kV feeder line, the range in power failure caused by the single-phase earth fault can be shortened to the largest extent, and accordingly reliability and safety of power supply are improved.

The invention relates to a power plant cooling system which improves the cooling efficiency by a residual heat refrigeration way, in particular to a cooling system which is used for the power plant, carries out the refrigeration by the residual heat of a steam turbine and utilizes the prepared cold water to cool the circular cooling water of the steam turbine further. The cooling system comprises a steam condensed water circulation consisting of a steam turbine, a steam condenser, a condensed water circulation pump and a combustion boiler, and a steam cooled water circulation consisting of a steam condenser, a cooling tower and a cooled water circulation pump. The cooling system is characterized in that a lithium bromide refrigeration unit is added; a high pressure generator of the lithium bromide refrigeration unit is arranged between the steam turbine and the steam condenser so as to lead the steam to become the heat source of the unit; the unit also comprises a refrigerant water tank which can store the cold energy; furthermore, the refrigerant water tank is connected with all air conditioners of the central air conditioning by pipelines; and the refrigerant water tank is arranged between the steam condenser and the cooling water circulation pump so that the refrigerant water is used for supplying the coldness to the central air conditioning or further cooling the circular cooling water of the steam turbine. The cooling system solves the problem that the residual heat of the power plant is cooled and wasted and has the advantages of high cooling efficiency, saving energy, being capable of supplying the cold source for the central air conditioning and the like.

The invention discloses a Power over Ethernet (PoE) port overvoltage comprehensive protection circuit and a method for realizing the circuit. The PoE port overvoltage comprehensive protection circuit comprises two-stage protection circuits, wherein the first-stage protection circuit adopts a triode gas discharge tube and is used for discharging lightning stroke current to the ground; the second-stage protection circuit adopts a clamp type overvoltage protection device and is used for carrying out first-stage residual voltage and electrostatic protection; a resistor and common-mode inductor combination circuit is adopted between the first-stage protection circuit and the second-stage protection circuit and is used for coordinating performance characteristics among the two-stage protection circuits and the device so as to achieve the effect of decoupling between the first-stage protection circuit and the second-stage protection circuit. Owing to the PoE port overvoltage comprehensive protection circuit, the balance of protection circuits can be enhanced and the amplitude and energy for conversion from common-mode overvoltage to differential-mode overvoltage can be reduced so as to improve the protection effect.

The invention discloses a source-load-storage coordinated scheduling method for improving new energy consumption. The method comprises the steps of S1, aggregating a thermal power plant, a new energypower plant, user loads and energy storage equipment into a source-load-storage scheduling system, and obtaining a new energy output curve, a heat utilization load curve and a power utilization load curve of the system; S2, establishing a source-load-storage coordinated scheduling model with the objective of maximizing new energy consumption quantity and minimizing the system operation cost; and S3, solving the source-load-storage coordinated scheduling model through utilization of improved multi-objective particle swarm optimization, and carrying out computing to obtain the source-load-storage coordinated scheduling method. The method has the advantages of simple realization method and flexible application. Schedulable resources such as power equipment, the user loads and the energy storage equipment in the system can be utilized rationally. The new energy consumption is facilitated, and moreover, operation cost of the system is reduced.

The invention discloses an intelligent overhead line fault positioning and monitoring system. The system is precise in fault positioning, high in precision and capable of quickly isolating faults, avoids long-time outage and improves operation reliability of a power grid. The intelligent overhead line fault positioning and monitoring system comprises a background server, a data collecting communication terminal, multiple fault indicators, a geographic information system and a distribution network automated system, wherein the background server, the data collecting communication terminal, the fault indicators, the geographic information system and the distribution network automated system are sequentially connected in a communication mode, and the geographic information system and the distribution network automated system are respectively connected with the background server. After a fault positioning and monitoring platform receives motion messages of the fault indicators, the geographic information system is accessed, all fault indicators which work and do not work on the same line are defined as upstream fault indicators and downstream fault indicators respectively, and a fault area is reduced to obtain a precisely positioned fault area by analyzing and determining the upstream fault indicators of a positioned fault area and the downstream fault indicators in the positioned fault area.

The invention discloses a miniaturized intelligent take-up device which is simple and reasonable in structure and portable and guarantees accurate recording of the length of a taken-up cable. The take-up device comprises a carrying box, a reel, a winding rotary shaft, a cable pressing structure for fixing the top end of the cable, a stepping motor, a control driving system, gear selection keys, carrying handles, a control circuit, a liquid crystal display screen and a connecting rod structure cable arranging unit. The carrying box is provided with the foldable carrying handles, and the three speed selection keys and the liquid crystal display screen are arranged on the top of the carrying box. The device has three speed gears used for meeting requirements of different occasions. A storage battery is used for supplying electricity, an electricity quantity detecting module is arranged, and electricity supplying of the device is guaranteed. The device is simple in mechanical structure, good in portability, free of limit of time and places, capable of taking up the cable on site in different environments, and easy and convenient to operate.

The invention discloses a heat radiation power distribution cabinet with an oxygen exhaust fireproof function; the heat radiation power distribution cabinet comprises a pedestal; the pedestal top is fixedly provided with the cabinet body via a support; the features are that a protection box is fixed on the bottom of the cabinet body; a control circuit board is fixed on the top in the protection box; the left and right side walls in the cabinet body are respectively fixedly provided with a fire extinguisher; the fire extinguisher valve employs a solenoid valve; the tops of left and right side walls in the cabinet body are respectively provided with a temperature sensor and a smog sensor; the bottoms of the left and right side walls of the cabinet body are evenly provided with a plurality ofair inlets; the top wall of the cabinet body is evenly provided with a plurality of unidirectional air outlets; a motor is fixed on the top of the protection box; a motor shaft on the motor top is fixedly provided with a fan. The heat radiation power distribution cabinet uses the fan to diffuse the heat of the cabinet; a dustproof net is arranged on the power distribution cabinet air inlets; theunidirectional air outlets are arranged, thus providing cooling and heat radiation effects, and preventing dusts from entering the cabinet.

The invention provides a resistance wire type coal seam heating device. The device comprises a mobile ground power generation system and a plurality of downhole heaters, wherein the mobile ground power generation system provides electric energy for the downhole heaters; each downhole heater comprises a coal seam upper permanent joint, a reinforcement pipe, an upper resistance wire and a lower resistance wire; the coal seam upper permanent joint is formed by an upper cylinder and a lower square cylinder; a square groove is formed in the top of the cylinder; an installing hole is formed in the square cylinder; two fracturing fluid inlet pipe joints are connected at the side parts of the coal seam upper permanent joint; a square joint is assembled in the square groove; the lower end face of the square joint is connected with an installing pipe penetrating through the installing hole; the upper resistance wire is arranged at the upper part of the reinforcement pipe in a sleeving manner and the lower resistance wire is arranged at the lower part of the reinforcement pipe in a sleeving manner. The device has the beneficial effects that the device adopts the method of injecting thermal fracturing fluid; the resistance wires are adopted by heating equipment for heating; a mobile ground power supply vehicle is adopted as main power supply equipment; the device has the advantages of convenience in operation, diverse functions, safety and reliability and capability of fully increasing the gas output.

The invention discloses a wind power plant power ultra-short-term prediction method based on feature selection and a recurrent neural network. The method comprises the following steps: serving meteorological factors influencing wind power plant power as candidate features, and collecting historical data corresponding to the candidate features to obtain a candidate feature data set F; carrying outfeature selection on the candidate features in the candidate feature data set F to obtain a selected feature data set S; serving the selected feature data set S as input data of a prediction model based on the recurrent neural network; carrying out training and test on the prediction model based on the recurrent neural network by utilizing the input data of the prediction model; and carrying out power prediction on a wind power plant and outputting a wind power plant power prediction result. The beneficial effects are that generation power can be known in advance, so that detection of generating capacity can be finished conveniently, problems can be found and solved in time, and the grid can be deployed in advance; and the method is high in reliability.

The invention relates to a grid fault locating system based on multisystem information integration. The grid fault locating system comprises a main station, a concentrator and fault indicators, wherein the fault indicators are installed on a line. The fault locating system is installed on the main station and the main station communicates with the concentrator in a GPRS communication mode. The concentrator is connected with the multiple sets of fault indicators in a radio frequency communication mode. The grid fault locating system further comprises a distribution network geographic information system, a distribution network automatic system, a fault intelligent diagnosis system and a distribution production management information system, wherein the distribution network geographic information system, the distribution network automatic system, the fault intelligent diagnosis system and the distribution production management information system are connected with the main station respectively. The main station is further connected with cellphones of emergency maintenance operators in a text message mode. The invention further relates to a grid fault locating method based on multisystem information integration adopting the system. An information integrated technology provided by multiple systems is utilized to replace single fault indicator movement information to conduct comprehensive locating on the positions where faults occur, the faults are accurately located, and reliability is high.

The invention discloses an elevator driving control and energy saving integrated system. A master control unit based on double DSPs and an FPGA is adopted in the system to collect voltage, current, speed position and other information of a traction machine, and control over the elevator traction machine is achieved after comprehensive judgment. A supercapacitor bank is adopted to serve as a power source for running of a regenerating braking energy storage device and an elevator driving control sub-system, and energy is stored in the running braking process of an elevator sub-system. A supercapacitor are directly connected with a direct-current bus in parallel through a two-way direct-current converter, the master control unit monitors the running state of an elevator in real time by means of an elevator signal collection unit, switching between a charging mode and a discharging mode of a supercapacitor module is finished, and the aim of saving energy is achieved. The system fully uses the characteristics that the supercapacitor is large in discharging current, long in service life, short in charging and discharging time, large in capacitance density and the like, improves energy saving efficiency and safety of elevator running, has very high social benefits and economic benefits, and accords with the concept of environment protection and sustainable development.

The invention discloses an intelligent power consumption management system facing a household wind and solar energy mutual-complementing power station and a management method thereof. The intelligent power consumption management system comprises an intelligent electric meter, a collector, a concentrator, a master station server, a short-message platform, a human-computer interaction terminal, a wind and solar power station, an intelligent control terminal, an intelligent socket, an intelligent switch, an intelligent home appliance, a temperature monitor, a humidity monitor and a smoke monitor, wherein an output terminal of the wind and solar power station is connected with the master station server via an RS485 interface; the intelligent electric meter is connected with the collector, the collector transmits intelligent electric meter information to the concentrator via the RS485 interface, and the concentrater is communicated with the master station server by using a network signal; the master station server transmits information to a user via the short-message platform, and the user performs a corresponding operation via the human-computer interaction terminal; the master station server controls the intelligent socket and the intelligent switch via the intelligent control terminal; and the temperature monitor, the humidity monitor and the smoke monitor communicate with the master station server via access points. According to the management system and management method, access and management of renewable energy can be achieved.

The invention relates to a mobile communication terminal and discloses a personal-information leakage-proof method for a mobile terminal and the mobile terminal. In the invention, every time the mobile terminal is started, whether the mobile terminal is used illegally is detected; when it is detected that the mobile terminal is used illegally, the mobile terminal starts at least one security clock, which exists on starting hardware and the security clock begins to timing when started. When the timing of the security clock is over, the mobile terminal is triggered to respond to a preset time-up event which is used for preventing illegal leakage of personal information of a user. Because the security clock exists on the hardware and is free from effects of operations such as preprogramming of software version, factory-setting restoration of the terminal and clearing of zone bits on a FLASH and the like, the mobile terminal is notified to execute a corresponding event through interrupt when the timing of the security clock is over so that an objective of preventing the illegal leakage of the personal information of the user is achieved.

The charging device includes charging socket, charger, charging plug, accumulators connected to each other in series. The charging device also includes convertor composed of DC relays. Number of DC relay is less than one of the numbers of accumulators. The DC relays possess dual sets of normal open and normal close contacts. Connection wire is built in the charging plug. Through connection wire built in the charging plug, winding in DC relay obtains power. When being electrified, relays attract accumulators so as to convert series connection to parallel connection. Features are: compact circuit design, very few electronic parts and components, safety and reliable so as to prolong service life of accumulators in use for electric motor cars more than one time.

The invention belongs to the technical field of communication, and discloses a POE power supply control method for communication equipment, which is used for power supply distribution of a POE system; including: a power receiving device PD is connected to a power supply device PSE through a network cable; the power supply device PSE is based on the power receiving device PD The power type value assigns the rated power supply to it; the power supply equipment PSE obtains the actual power consumption of the powered device PD in real time, and uses the actual power consumption as the rated power supply power of the powered device PD to perform power supply operations; wherein, the The power supply equipment PSE monitors the power consumption of the powered device PD in real time, and adjusts the power supply allocated to the powered device PD. The control method provided by the invention can fully tap the potential of the power supply equipment PSE, download more downstream IP equipment when the power supply capacity is limited, and at the same time ensure the power supply and safety of important equipment.

The invention discloses a fire evacuation system and an evacuation method. The fire evacuation system comprises a fire evacuation acoustic-optical indicating system, an acoustic-optical power supply system, a fire parameter detection system, a control system and a fire alarm system; the fire evacuation acoustic-optical indicating system, the acoustic-optical power supply system and the control system and electrically connected mutually; the acoustic-optical power supply system continuously supplies power for a lamp assembly in the fire evacuation system; the control system controls the acoustic-optical power supply system to supply power for a voice prompt device in the fire evacuation acoustic-optical indicating system through a second power supply circuit and controls the luminance of the lamp assembly and acoustic-optical contents of the fire evacuation acoustic-optical indicating system through the control circuit; the fire parameter detection system and the control system are electrically connected to the fire alarm system through data transmission lines respectively. The fire evacuation system can provide different evacuation guidance for users at different floors according to point locations of fires and fire conditions of fire scenes and avoids the users from running to error channels or taking error actions and accordingly gets into danger.

The embodiment of the invention discloses a control method for a marine hybrid power unit, a power unit and a power system. The hybrid power unit comprises a lithium battery and a fuel cell. The control method comprises the steps that a voltage converter of the fuel cell receives a demand power command; if the demand power does not exceed the rated power of the fuel cell, the fuel cell is controlled to output power satisfying the load demand; and a voltage converter of the lithium battery determines the fluctuation power according to the change value of the bus voltage and controls the lithium battery to output or absorb the fluctuation power. According to the control method for the marine hybrid power unit, the power unit and the power system, the fuel cell and the lithium battery are combined to form the hybrid power unit, and the fuel cell and the lithium battery are controlled through the voltage converters, so that the fuel cell outputs the power meeting the load demand, and the lithium battery is controlled to switch the working mode according to the change of the bus voltage so as to output the difference power or absorb the surplus power, the bus voltage is kept within the rated voltage range, and therefore the power meeting the requirements of a ship is output in real time.

The invention discloses an evaluation method for an electric transmission line orientated forest fire approaching risk. The method includes the following steps that A, forest fire happening information is obtained from a forest fire monitoring system based on satellites; B, electric transmission lines affected by ignition points are determined according to the happening position of the ignition points and longitude and latitude coordinates of the electric transmission lines; C, real-time meteorological data are obtained from an automatic meteorological monitoring station; D, according to the forest fire happening information, the real-time meteorological data and the electric transmission lines affected by the ignition points, risk indexes of the forest fire on all the electric transmission lines affected by the ignition points are sequentially calculated; E, a forest fire early warning risk grade of the forest fire event is determined according to the forest fire approaching risk indexes, and forest fire approaching risk early warning information is issued according to a set issuing standard; F, whether risk evaluation calculation is completed or not is judged. The evaluation method can quickly evaluate the risks of the forest fire on nearby lines after the forest fire happens, and the early warning information can be issued according to an evaluation result.