146results about How to "Extended power generation time" patented technology

The invention aims to provide a connected grid wind-light complementation control inverting device which comprises a storage battery charging unit, a DC-DC voltage boosting and stabilizing unit, a connected grid inverting unit and a storage battery; the storage battery charging unit is connected with the DC-DC voltage boosting and stabilizing unit; and the DC-DC voltage boosting and stabilizing unit is connected with the connected grid inverting unit and the storage batter. The device prolongs the power generation time with the complementation of solar energy and wind energy, improves the continuity of the current which is injected into a power grid, and effectively improves the utilization rate of the solar energy and the wind energy; a solar panel automatic tracking system keeps correcting the horizontal angle and the pitch angle of a solar panel, so that the power generation efficiency of a solar power generation system is the highest. The device adopts PWM stepless unloading and ensures the best storage battery charging property; and a current loop of an inverter is realized by an analog device, thereby improving the response speed of a system, ensuring the tracking property of inversion current to the voltage of the power grid, and improving the power factor.

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 provides a system and a method for pre-warning and controlling gust load of a wind power station. The system comprises at least one standby gust load pre-warning machine, and a wind power station level control unit; the at least one standby gust load pre-warning machine is at least one wind driven generator which is distributed at the periphery of the wind power station, and is positioned at the windage front position of the wind power station; and the wind power station level control unit acquires a wind angle of the wind power station, selects the current gust load pre-warning machine aiming at the wind angle from at least one gust load pre-warning machine according to the wind angle, acquires the characteristic value of the current gust according to the running state of the current gust load pre-warning machine and performs pitch regulation on all wind driven generators distributed in the wind power station according to the pitch regulation velocity corresponding to the characteristic value of the current gust, and changes the pitch angles of blades of all wind driven generators to ensure that all the wind driven generators run at rated power if the characteristic value of the current gust is more than a preset threshold value and less than the safety threshold value of the current gust load pre-warning machine.

The invention discloses an operation method for safely applying a line protection device to a wind power station, which relates to the relay protection of a power plant and is provided aiming at solving the problem that the line protection device in the current system cannot meet the protective requirements of the wind power station very well. The operation method comprises the following steps of: firstly, establishing a real-time simulation model which is a virtual power grid environment, including fault points in a wind power station, a bus and transmission lines, a main transformer unit of a power generator, a current and voltage mutual inductor, an equivalent system and a simulation system; secondly; establishing an experimental detection platform including a real-time digital simulation work station, an RTDS (Real Time Digital System) real-time digital simulator, an analogue quantity output board card, a power amplifier, a line protection device, an analogue circuit breaker, a switch conversion device and a digital quantity input board card; and thirdly, accessing the line protection device to be detected to the power amplifier of the detection system, then connecting the line protection device with the analogue circuit breaker and carrying out various kinds of experiments. The experiment implemented by using the wind power station model and an onsite oscillograph of the wind power station can provide a real and accurate simulation environment so that validation possibility is improved, and therefore the line protection device to be detected can be safely used for the wind power station after detected.

The invention discloses a method for computing wind power bearing capability of a power grid, relates to operation optimized analysis of wind power plants, and aims at negative factors of wind power integrated grids to provide a method for computing a network-adaptive wind power bearing capability. The method for computing the wind power bearing capability of the power grid is characterized by includes the steps of firstly establishing two mathematical models including Pbalance1=Pload+Ploss+PGuse-Pspin-PGlow and Pbalance2=Ptran+PGadj to respectively compute local power demand and the wind power bearing capability determined by pitch peaks of the power grid, combing a local power grid running load curve with a future load predicting result, and a history wind power output curve with wind power planning capacity to obtain daily, monthly and annually bearable wind power capability in future years of the local power grid; at the same time, establishing an actual power grid simulating system for closed-loop tests including real-time steady load flow calculation, voltage fluctuation and transient stability and the like so as to verify whether the computation results obtained from the mathematical models meet actual running requirements of the power grid or not; adopting on yes, and modifying on not. The wind power plant can be guaranteed to be optimally comprehensively adjusted with other power sources, thus the wind power plant can run in a better network-adaptive mode, and power supply quality and safety and stability of power grid can be guaranteed.

The invention relates to a parameter identification-based photovoltaic power generation system fault diagnosis method and a parameter identification-based photovoltaic power generation system fault diagnosis system. The parameter identification-based photovoltaic power generation system fault diagnosis method includes the following steps that: the fault diagnosis model of a photovoltaic power generation system is built, and the optimal solutions of the fault diagnosis model are obtained; the fault diagnosis model is trained; and fault diagnosis is carried out on the photovoltaic power system based on the trained fault diagnosis model. According to the parameter identification-based photovoltaic power generation system fault diagnosis method of the invention, according to problems which easily appear in the photovoltaic power generation system, namely, open-circuiting and short-circuiting of a photovoltaic battery assembly, the overload of an inverter and the failure of a control system, the parameter identification-based photovoltaic power generation system fault diagnosis model under a mismatch condition is built; an I-U curve is obtained according to the data of a photovoltaic power plant in different working conditions; analog simulation is carried out on the actually-measured I-U curve, so that the optimal solutions of the parameters of the model are obtained; an RBF neural network is utilized to train the model, so that the trained fault diagnosis model is obtained; and test samples or real-time samples of the photovoltaic power plant are inputted to the model, so that fault diagnosis can be carried out.

The roof wind driven generator set includes a wind mill of diameter smaller than 3 m, a short tower rooted on the roof beam, a generator fixed to the top of the short tower and connected to the generator room through bearings with heat sink, a housing of asymmetrical structure, an orientating wing in the outer surface of the housing for the wind inlet always in the wind direction, a lightning arrester and other parts. The generator is connected electrically to the power supply of the building and may provided with an incorporating regulator for incorporating to power network.

The invention relates to a high-specific-energy aeronautical fuel cell power generation system, especially an aeronautical proton exchange membrane fuel cell power generation system with liquid hydrogen as a fuel. The power generation system comprises a liquid hydrogen storage tank, a buffer tank, a pressure sensor, a hydrogen pressure reducer, a solenoid valve for water, a solenoid valve for hydrogen, a proton exchange membrane fuel cell, an air pump, a circulating water pump, a water tank, a temperature regulator, a heat exchanger, etc. According to the invention, the own heat of the fuel cell is used for providing a heat source to the liquid hydrogen storage tank so as to realize gasification of hydrogen; oxygen in the air is used as an oxidant; and high-speed incoming air out of an aircraft is used as a cold medium to dissipate excess heat of the fuel cell. Compared with conventional aeronautical fuel cell power generation systems storing hydrogen with high-pressure gas cylinders,the high-specific-energy aeronautical fuel cell power generation system of the invention has the advantages of great hydrogen storage capacity, light weight, small size, low working pressure, safety,reliability, fast fuel filling rate, simple fuel filling mode and the like and especially applicable to aeronautical fuel cell power generation systems with high requirements for long endurance, weight and size.

The invention discloses a one-phase five-level inverter. The one-phase five-level inverter comprises a common ground type three-level switching circuit, a filter circuit and a power frequency inversion circuit. For being realized specifically, the inverter comprises six power switches from S1 to S6, two diodes from D1 to D2, and a one-phase output filter F. The output of the inverter is five levels, and the inverter has the advantages of being high in inversion efficiency and reliability and simple in control mode. Meanwhile, through the voltage clamp mode, the inverter can eliminate high-frequency common mode current danger in a non-isolated type grid-connected inverter system effectively. Thus, the inverter is especially suitable for being applied to a non-isolated type photovoltaic grid-connected system.

The invention discloses a low-temperature start control method for a wind generating set. When cut-in wind speed is reached and the starting conditions are not met due to low gearbox oil temperature or low generator winding temperature, the wind generating set enters a cold start mode from a standby mode, a gearbox heater and a generator heater are started, and fan blades open at certain angle to allow a wind wheel to idle at certain speed. Lubricating oil and grease are heated at higher speed by lubricating oil and grease in a rotary stirring gearbox of the wind generating set. Cycling of the lubricating oil can also be quickened by a lubricating oil pump, the lubricating oil is heated at higher speed, and the cold start mode allows the wind generating set to start at higher speed at the low temperature, the starting time is about halved, a fan is better protected, labor is reduced for fan maintainers, grid connection response of the wind generating set is better, power generation of the wind generating set is higher, and the low-temperature start control method for the wind generating set is suitable for popularization and application in cold areas.

The invention relates to a device using solar energy to generate power, in particular to a solar hot gas flow generating device which uses solar energy to enable gas to flow. The solar hot gas flow generating device comprises a heat collecting shed, a flow guiding chimney communicated with the heat collecting shed and a gas flow generator installed in the flow guiding chimney, wherein the heat collecting shed comprises a light-transmitting heat collecting shed which is positioned at the edge of the heat collecting shed and a solar vacuum tube heat collecting module which is connected with the light-transmitting heat collecting shed and is positioned in the middle of the heat collecting shed; olivary flow guiding chambers are uniformly distributed between the heat collecting shed and the ground; the flow guiding chambers and the heat collecting shed are hermetically connected, and the light-transmitting heat collecting shed and the heat collecting module are hermetically connected; and a gas flow generator I is installed in a speed increasing channel formed by the two flow guiding chambers. In the invention, the heat collecting shed comprises a low temperature region and a high temperature region, the speed increasing channel is arranged in the heat collecting shed, solar photovoltaic cells are installed on the heat collecting shed, and the waste heat of the flow guiding chimney is recycled simultaneously, thereby effectively improving the efficiency of the solar hot gas flow generating system, increasing the strength of the heat collecting shed and prolonging the service life of the heat collecting shed.

The invention discloses a dual-motor switching control method for a wind generating set. The dual-motor switching control method comprises the following steps of: controlling a permanent magnet synchronous motor and an induction asynchronous motor by the wind generating set in a switching manner when a wind driven generator is in a ready state, a starting state, a generating operation state and a fault state.

The invention discloses a method for determining the inactive compensation capacity network adaptability of a wind power plant and relates to power grid optimization analysis. Aiming at the situation that the conventional inactive capacity configuration of the wind power plant is not reasonable, the invention provides a new inactive capacity calculating method which comprises the following steps of: firstly, establishing a power grid simulation mode which is composed of a wind power plant, a box transformer substation, a current collection line, a boost transformer substation, an outgoing line and an accessing power grid system; secondly, determining an inactive configuration capacity change range by adopting the conventional theoretical calculating method; carrying out a closed loop test on a compensation capacity range value determined by using the conventional theoretical calculating method through using a simulation system so as to determine the sensitivity (of the wind power plant) to be compensated and the capacitive inactive compensation capacity (of the wind power plant) to be compensated; and introducing the sensitivity and the capacitive inactive compensation capacity into a simulation power grid model, and verifying a steady trend, a dynamic voltage fluctuation and a transient stability so as to obtain adaptive network inactive compensation configuration capacity and corresponding equipment technical requirements, thus ensuring that the inactive compensation capacity of the wind power plant can be effectively used for the inactive configuration of the wind power plant.

The invention discloses a variable speed constant frequency permanent magnetic speed-adjusting wind power generator, comprising a wind wheel, a transmission shaft, a speed-up gear box, a generator and a frequency converter, and further comprising a permanent magnetic speed adjustor arranged on the transmission shaft between the speed-up gear box and the generator. The invention has the advantages that (1) the rotation speed output from the wind wheel or the gear box to the generator can be in stepless speed adjusting in a such way that the permanent magnetic speed adjustor adjusts air gaps, so that the rotation speed of the generator is relatively constant; (2) the soft start is realized, the generator can be switched in or switched out at any time under any rotation speed of a fan so as to increase the generating time of the wind power generator; (3) system vibration is eliminated so as to prolong the service life of a system apparatus and improve the reliability; (4) the invention is suitable for various bad working environments; (5) parts of the whole machine are reduced, and the fee of manufacture, use and maintenance is reduced; (6) blocking rotation and pulse are not needed to be afraid; (7) errors of centering can be tolerated; (8) the service life of the apparatus and the fault period are increased; (9) electromagnetic interference dose not exist; and (10) the total cost is reduced.

The invention discloses a tidal current energy generator set and a yawing method thereof. The tidal current energy generator set comprises a tidal current energy hydraulic turbine set, a main support frame, a floating type ocean platform and a yawing system, a hole for lifting the tidal current energy hydraulic turbine set is formed in the floating type ocean platform, the main support frame passes through the hole, the lower part thereof is firmly connected with the tidal current energy hydraulic turbine set, the upper part is firmly connected with the yawing system, and the yawing system is supported above the floating type ocean platform through a yawing bracket. The yawing system of the tidal current energy generator set is arranged on the sea level, relevant data are sent to a master control system through an ocean environment detection system, the master control system controls the yawing of the yawing system, all the bidirectional tidal current energy can be captured, the usable power generation time is prolonged, and the power generation efficiency of the tidal current energy generator set is improved. The tidal current energy generator set is simple in structure and convenient to maintain.

The invention discloses an MPPT control method based on resistance matching of a photovoltaic power generation system. A fuzzy MPPT controller samples voltage and current values of a photovoltaic array in the power generation process in real time by means of a voltage and current circuit, an MPPT fuzzy control algorithm of the fuzzy MPPT controller is used to generated a PWM control signal by calculation and processing, the PWM control signal is used to control work of a Boost circuit, the duty ratio of a DC chopper circuit is adjusted, the load impedance matching is controlled, and thus, theinternal resistance of a circuit of the photovoltaic power generation system matches the load impedance most rapidly. The method has the advantages that the circuit of the photovoltaic power generation system can be started for power generation at extremely low illumination intensity, relatively low circuit serial resistance and very low consumption of the circuit itself by means of photovoltaic array simulation and fuzzy control, the photovoltaic power generation system can get up early and sleep late, the power generation time of the system is prolonged, the MPPT fuzzy control algorithm enable the system to run at the maximal power point, and the power generation capacity of the photovoltaic power generation system is improved.

The invention discloses a rack gear power generator comprising power generation devices, a cylindrical buoyant box, two fixed pulleys, a movable pulley, a cylinder body cavity and a counter weight in the cavity, wherein the cylindrical buoyant box is connected with the counter weight in the cylinder body cavity through a first fixed pulley, the movable pulley and the second fixed pulley in sequence. The rack gear power generator also comprises a meshing device arranged between the movable pulley and the second fixed pulley; and the meshing device comprises a rack, a first gear and a second gear which are symmetrically arranged at the left end and the right end of the rack, as well as a first spring and a second spring which are symmetrically arranged at the left end and the right end of the rack, wherein the first gear and the second gear are respectively connected with one power generation device. The rack gear power generator is capable of generating power by wave, simple in structure, high in efficiency, strong in adaptivity to water depth, and low in manufacturing and installation costs, and can be used for long time without manual maintenance.

The invention relates to a system which utilize solar energy to achieve condensation photo-thermal power generation. The system is formed by three parts of thermal energy storage and conversion, thermal energy conversion and power generation and condensation and circulation of water, adopts tight connection between a thermal storage part and a conversion part, dynamic seal technology and even pressure technology to achieve direct cycle power generation by utilizing steam. Compared with a common condensation photo-thermal power generation system, the system reduces system equipment, lowers cost in multiple aspects, improves utilization and conversion efficiency of thermal energy, has long power generation time and good economic benefit, and is suitable for commercial and large scale grid-connecting operation. In addition, intermittency and instability of the solar energy have small influence on the quality of the power energy.

A solar energy and building integrated hot air power generation, ventilation and heating system comprises a house body. The house body comprises a foundation, walls, doors, windows and a solar hot air power generation, ventilation and heating system body. The solar hot air power generation, ventilation and heating system body comprises a solar energy ground collector, a solar energy outer wall collector, a solar energy roof collector, a solar hot air power generator, a solar heating device, a solar ventilating device and a solar hot air water heating device. The solar hot air power generation, ventilation and heating system has the advantages that the features of solar energy is effectively used, solar energy hot air is used for heating domestic hot water, ventilating, cooling, power generating and heating, solar energy air collectors are integrated with a building, the system is low in cost, safe, reliable, good in stability and capable of comprehensively utilizing solar energy all the year round, and the domestic hot water supply, winter heating, summer power generation, ventilation and cooling of the single building in northern areas can be achieved.

The invention provides a tidal power generation method and a universal tide power plant. Two reservoirs A and B are enclosed by a cofferdam method on a shoal or shallow sea; furthermore, a water inlet strobe and a water outlet strobe are arranged on the cofferdam to correspond to the reservoir A and the reservoir B; a separation levee between the reservoir A and the reservoir B is provided with a hydraulic generator set which generates power by water head; when an astronomic tide ebbs to the lowest tide level, the water outlet strobe corresponding to the reservoir B is closed to wait for flood tide; when the tide is flooded, the water inlet strobe of the reservoir A is opened and the water enters; furthermore, when the water level reaches the water head between the reservoir B and the reservoir A more than the minimum design of the water head difference for generation, the hydraulic generator set starts to generate power; when the astronomic tide is flooded to the highest tide level, the water inlet strobe of the reservoir A is closed, and the hydraulic generator set continues to generate power by the water head between the reservoir A and the reservoir B when the water level of the B reservoir ascends and the water level of the reservoir A descends; when the tide level ebbs below the water level of the reservoir B, the reservoir B is opened and the water is discharged out, leading the water level of the reservoir B is reduced to the minimum tide level with the ebb and the hydraulic generator set can continue to generate power till the tide is flooded to the next circulation. The invention has the advantages of long generation time, low manufacture cost of unit electric energy, strong controllability of electric energy quality, wide applicable range of plant establishment, high comprehensive exploitation rate of resource, etc.

Disclosed is a new energy commercial vehicle energy efficient recovery system. The new energy commercial vehicle energy efficient recovery system is characterized in that an electric generator is connected with a storage battery, the electric generator is connected with an ECU (electronic control unit) through an electric generator controller, an acceleration sensor and a displacement sensor are arranged on an electromagnet foot valve, the displacement sensor is used to measure the descending position of an ejection rod, the acceleration sensor moves along with the ejection rod, the acceleration sensor is used to measure the descending accelerated speed of a pedal, the acceleration sensor, the displacement sensor, the storage battery and a proportion relay valve are respectively connected with the ECU, a brake pedal work angle of the maximum point braking of the electromagnet foot valve ranges from 11 degrees to 12.5 degrees, and a brake pedal work angle of the maximum semi-braking of the electromagnet foot valve ranges from 19 degrees to 20.5 degrees. The new energy commercial vehicle energy efficient recovery system is obtained by optimizing a new energy commercial vehicle energy efficient recovery system in the prior art, and the optimized new energy commercial vehicle energy efficient recovery system can recover 50% of energy at most when a vehicle brakes, greatly improves charging efficiency, and reduces wear of friction braking on a brake and related components.

The invention relates to a solar photovoltaic generation system. The system comprises a reflection condenser, a light frequency division diplexer, a crystalline silicon solar panel and an amorphous silicon solar panel, wherein the reflection condenser is used for uniformly reflecting and condensing the full solar spectrum; the light frequency division diplexer is used for high transmitting the spectrum generated by a crystalline silicon solar cell and high reflecting the spectrum generated by an amorphous silicon solar cell; the crystalline silicon solar panel and the amorphous silicon solar panel respectively receive the respective sensitive solar spectrum and convert into electrical energy; and the crystalline silicon solar panel and the amorphous silicon solar panel are connected in parallel to supply power to a load. The invention has the characteristics of uniform light energy condensation, high energy utilization efficiency, long generation duration, large generating capacity, easy processing and mass production, lower cost and the like, and has favorable application prospects in the development and the utilization of new clean energy.

The invention discloses a photovoltaic power generation method and system and relates to the technical field of electric power. The photovoltaic power generation method and system solve the problem that when light flux of sunlight is low in the prior art, photovoltaic power generation can not be achieved. According to the technical scheme, the photovoltaic power generation method comprises the steps that S10, a detection device obtains a light flux index of current sunlight; S20, the detection device sends a control signal to a photovoltaic combiner box connected with the detection device in advance according to the relation between the light flux index and a preset index; S30, the photovoltaic combiner box controls multiple switches inside the photovoltaic combiner box according to the control signal and adjusts the connection mode between multiple photovoltaic assemblies after receiving the control signal sent by the detection device, and the input end of the photovoltaic combiner box is connected with the photovoltaic assemblies; S40, the output end of the photovoltaic combiner box outputs direct current to an inverter connected in advance through a direct current cabinet, so that the inverter adjusts the direct current and outputs the direct current. Through the scheme, the photovoltaic power generation method and system can be applied to solar power generation systems.

The invention relates to a wind turbine generator adopting a wind speed rudder for controlling backward speed regulation. The wind turbine generator comprises a yawing platform, a tower frame, generators, the wind speed rudder, a wind speed rudder stock and a connecting rod, wherein the yawing platform is mounted on the tower frame; at least one generator is directly or indirectly mounted on the yawing platform; the generators are connected with the wind speed rudder stock through the connecting rod; and the wind speed rudder is fixed at the tail end of the wind speed rudder stock. According to the wind turbine generator, when heavy wind blows, the wind turbine generator can incline backwards to avoid the wind; and when the heavy wins blows to a building, the wind direction can be changed abruptly, the wind avoiding reaction is sensitive and accurate, and the wind turbine generator has wider adaptability to the wind speed and suitable for multiple wind power generation through one tower. A wind turbine generator system of one to five kilowatts can be produced with a set of templates of one kilowatt, and a wind turbine generator system of twenty five kilowatts can be produced with a set of templates of five kilowatts, so that the development cost of a blade, a propeller hub and the generator is decreased. According to the wind turbine generator, two, three, four or more generators can be manufactured according to practical conditions.

A closed-loop apparatus for converting mechanical energy into electrical energy utilizes a closed-loop channel including sections of different cross-section (including a first group of sections having a constrained cross-section and a second group sections having an enlarged cross-section). An energy-producing configuration (such as coils and / or electrodes) is formed to surround at least a portion of the channel. A closed-loop chain of energy-producing elements is positioned in channel such that when the chain moves along the channel, the mechanical motion generates electrical energy. The chain is formed to include a set of expandable assemblies that change in dimension as they pass through the different cross-section areas of the channel. An inert fluid is injected into the channel at one or more locations by a mechanical force, resulting in the creation of a pressure-induced force differential that initiates and maintains the movement of the chain with respect to the channel.

The invention discloses a wave-energy energy-collecting power generation device for ships. The wave-energy energy-collecting power generation device comprises two balanced drainage energy-collecting mechanisms, connecting components, protection components and a power generation system, wherein the two balanced drainage energy-collecting mechanisms are symmetrically arranged on the two sides of a ship body and are connected with the ship body through the connecting components; the protection components are mounted at the top end and on the bottom part of each of the balanced drainage energy-collecting mechanisms; and the power generation system is mounted in the balanced drainage energy-collecting mechanisms. According to the wave-energy energy-collecting power generation device for the ships disclosed by the invention, power is generated by adopting marine-renewable wave energy instead of fossil energy such as gasoline or diesel, so that the sailing cost of the ships is reduced, voyages of the ships can be increased, and pollution to a marine environment is reduced. By adopting the balanced drainage energy-collecting mechanisms, wave is converged and accelerated, so that water flowing kinetic energy can be effectively improved, and the power generation efficiency is promoted; and meanwhile, a water turbine is driven by bidirectionally utilizing wave energy so as to generate thepower, so that the adaptability of the power generation device on complicated and changeable marine conditions also can be improved.

The invention relates to a wind generating set. The wind generating set comprises an impeller (1), a main shaft (2), a gearbox (3), and a coupler (4), a generator (6) and a main machine frame (7) used as a supporting piece. The impeller (1) drives the main shaft (2) to rotate. The gearbox (3) is installed on a transmission chain of the main shaft (2) and is connected with the generator (6) through the coupler (4). The wind generating set further comprises a control device (50) and a speed rotation measuring device (9). An inner gear ring of a gear transmission mechanism in the gearbox (3) is connected with the control device (50) through an auxiliary transmission device. When the rotation speed measuring device (9) detects that the rotation speed of the main shaft (2) changes, the control device (50) controls the inner gear ring of the gear transmission mechanism to change the rotation speed and / or the rotation direction according to the change of the rotation speed of a sun gear in the gear transmission mechanism through the auxiliary transmission device, so that the transmission ratio of the gear transmission mechanism is adjusted; in this way, the application area of a draught fan is expanded, and the overall cost of the wind generating set is reduced.

The invention relates to a multi-way MPPT photovoltaic inversion system which is technically characterized in that an inverter main circuit comprises a plurality of independent photovoltaic inversion units; a plurality of photovoltaic modules are connected with the corresponding photovoltaic inversion units via photovoltaic inversion unit direct current contactors and EMI (Electro-Magnetic Interference) filter circuits respectively; the photovoltaic inversion units are connected with a three-phrase power grid via an LCL (Lower Control Limit) filter circuit; the inverter control circuit is formed by connecting a main station control system and a plurality of slave station control systems; each photovoltaic inversion unit acquires respective alternating current inlet wire current, direct current voltage and direct current; and power grid voltage is acquired by the main station control system of the inverter control circuit and transmitted to the slave station control systems for common use at high speed. The system employs a high-speed communication manner between a main station and a slave station to achieve an inversion output carrier function, and reduces common mode voltage between inverters, the stability and reliability of the system are improved, common mode current through a PV (Photovoltaic) array is reduced, and the service life of a battery board is prolonged.

A two-loop type solar thermal power generation system comprises a first-loop solar heat collecting subsystem and a second-loop steam power generation subsystem. The first-loop solar heat collecting subsystem obtains high-temperature working media by the way of heating low-temperature working media through solar energy and stores the high-temperature working media. The second-loop steam power generation subsystem is used for generating various kinds of steam with different pressures and temperatures by the way of heating water and steam by the high-temperature working media to drive a steam turbine generator unit to generate power. The heated high-temperature working media lowers to be low-temperature working media and are conveyed back to the first-loop solar heat collecting subsystem to be continuously heated. The solar heat collecting subsystem and the steam power generation subsystem operate independently and do not affect each other. The two-loop solar thermal power generation system can be used for removing system fluctuations caused by uncontrollable factors of solar radiation strength variation, cloud shielding and the like, adjusting of the power generation power of the steam turbine generator unit and continuous and stable power generation can be achieved, and the power generation efficiency of the solar thermal power generation system is improved.

The invention relates to a direct-drive ground generating set for high-altitude power generation, and belongs to the technical field of high-altitude wind power generation. The ground generating set comprises a generator and brakes, rollers, clutches and motors which are arranged on two sides of the generator symmetrically, wherein two ends of one roller and two ends of the other roller are connected with the brakes; two ends of a rotor shaft of the generator are connected with the brakes at one end of one roller and at one end of the other roller; the brakes at the other ends of the rollers are connected with the motors through the clutches; when the generator generates electricity, the two rollers are connected with an aerial work doing umbrella through ropes; and the two clutches are connected with an external control part and controlled to alternately work, so that the generator generates the electricity continuously, and the generated energy of the generator is improved. The ground generating set can transmit aerial mechanical energy to the ground; and the two clutches are controlled to alternately work by the external control part, so that the generator is in a working stateall the time.