451results about How to "Stable power output" patented technology

The invention relates to an internal combustion engine that can be operated in compression ignition mode, the engine comprising a fuel injector for each cylinder; a fuel injection controller for controlling fuel injection quantity and a piston in each cylinder whose compression action causes a mixture of air and fuel to be ignited. The engine is further provided with inlet and outlet valves and sensors for measuring various engine operating parameters. During compression ignition mode, the control unit controls the fuel injector to perform a first fuel injection before top dead center of the exhaust stroke during a period of negative valve overlap, and a second fuel injection during the piston compression stroke. The control unit may perform a switch between a first fuel injection strategy and at least one further fuel injection strategy in response to a change in load demand on the engine.

The invention discloses a comprehensive test stand for water-lubricated bearings for pumps. The comprehensive test stand comprises a driving transmission system, a main box, a bearing, a lubricating system, a loading system, a measuring system, a signal analyzing and processing system and the like, the driving transmission system consists of a variable-frequency motor, an elastic coupler, a step-up box and the like, the main box is a cube with a transparent top cover plate, and a spindle horizontally enters the box from a side wall, which is close to the end of the elastic coupler, of the main box. A pressure sensor, an eddy current sensor, a vibration acceleration sensor, a temperature sensor and the like are sequentially arranged and mounted on the spindle or around the spindle and used for acquiring displacement signals, rotation speed signals, phase signals, temperature signals, pressure signals, vibration signals and the like, and the sensed signals which are acquired by the various sensors in an online manner are transmitted to an upper computer to be processed, displayed and stored. The comprehensive test stand has the unique advantages of fine performance, high precision, low cost, environmental protection, zero pollution, friction reduction, energy conservation, noise and vibration reduction, fine fire resistance, easiness in maintenance and the like.

A power distribution method for electric vehicle driven by two power sources includes executing a first power distribution law by a vehicle control unit, wherein the first power distribution law sets a distribution ratio according to a vehicle speed of the electric vehicle, a torque demand, and a current gear of a transmission. The powers outputted by first and second motors are adjusted according to the distribution ratio such that the first and second motors can operate at the most efficient operation points to increase the operational efficiency of the electric vehicle driven by two power sources.

An internal combustion engine that can be operated in compression ignition mode, comprising a fuel injector (2) for each cylinder; a fuel injection control unit (4) for controlling fuel injection quantity and a piston (5) in each cylinder whose compression action causes a mixture of air and fuel to be ignited. The engine is further provided with inlet and outlet valves (6, 7) and sensors (12-16) for measuring various engine operating parameters, is disclosed. During compression ignition mode, the control unit controls the fuel injector to perform a first fuel injection before, and a second fuel injection after top dead center of the piston stroke during or after a negative valve overlap period. A method for operating the engine and a computer readable storage device (4) having stored therein data representing instructions executable by a computer to implement a compression ignition for an internal combustion engine is also described.

The invention relates to an internal combustion engine that can be operated in compression ignition mode, the engine comprising a fuel injector for each cylinder; a fuel injection controller for controlling fuel injection quantity and a piston in each cylinder whose compression action causes a mixture of air and fuel to be ignited. The engine is further provided with inlet and outlet valves and sensors for measuring various engine operating parameters. During compression ignition mode, the control unit controls the fuel injector to perform a first fuel injection before top dead center of the exhaust stroke during a period of negative valve overlap, and a second fuel injection during the piston compression stroke. The control unit may perform a switch between a first fuel injection strategy and at least one further fuel injection strategy in response to a change in load demand on the engine.

The invention discloses an active optimal control system of a wind and light storage combined power generation system and a method. The active optimal control system comprises a wind and light storage combined power generation system control central station and wind and light storage combined power generation system control substations. The method includes drawing out a power output curve of a wind power station, a photovoltaic power station and an energy storage power station according a planed power output curve and by considering correlated conditions of the wind power station, the photovoltaic power station and the energy storage power station, and distributing correlated plans to all control substations; and working out generation plans of corresponding control units according to power output plans distributed by all control substations, and executing power output plans distributed by control substations finally by the control units. By the aid of the control process, the wind and light storage combined power generation system can be guaranteed to operate according to the force output curve, charge-and-discharge times of storage batteries can be reduced, low current charge-and-discharge of the energy storage power station is avoided, the short-time overload capability of the energy storage power station is fully utilized, and the service life of the energy storage power station is prolonged.

The invention discloses a solar thermal power generation system by thermoelectric conversion, comprising a sunlight-concentrating and receiving module, a solar tracking module, a photothermal-conversion module for absorbing sunlight then transforming sunlight into thermal energy and a combination of semiconductor thermoelectric module, the combination-type cooling module is under the semiconductor thermoelectric module. In the invention, TE module can directly convert solar thermal and waste heat to electricity without heat transfer medium, heat storage tank, turbine, and mechanical moving part, thus realizing small scale, compact system with high efficiency; Due to the adopting of low concentrating lens with tracking system and compound waste heat supplying module, thus reducing floor area and effectively improving temperature difference and power generating efficiency of the overall system. In comparison with that of traditional solar thermal power generation system, the new system kept the advantages, including: low investment and low maintenance cost. In comparison with that of solar cell power generation system, the system has the advantages: large power in small area and possible in stable output; furthermore a heating source apart from solar energy is introduced to guarantee the stable current supply.

A domestic combined heat and power (dchp) unit includes a Stirling engine (1) to provide heat for a domestic dwelling along with a source of electrical power. Under normal operation, the dchp is supplied with power from the national grid. When there is an interruption in the mains power from the grid, the dchp switches into a grid independent mode wherein power is generated by the dchp and is supplied to a controller (26) and to a water pump so as to maintain integrity of heat supply to the dwelling; the remaining power after that is supplied to selected domestic electrically powered equipment such as lights or television sets. The invention also discloses methods for black start of the dchp during a mains power loss, and also modification of the operating voltage on start up of electrical equipment during a power loss, to prevent the Stirling engine stalling.

The invention provides a dual loop voltage regulator based on an inverter amplifier and a voltage regulating method thereof. A voltage regulator includes a pass element, a buffer, and an error amplifier. The voltage regulator further includes a fast push-pull driver that has an inverter type amplification structure, is connected between a power output and a control input of the pass element, and reduces positive and negative peaks of the power output at a speed faster than a speed of a main feedback loop.

The invention relates to a control system and a control method for a large-scale energy storage power station of a wind farm, which are particularly applicable to regions with smaller capacity of power grids or greater proportion of wind power installed capacity to gross installed capacity of the power grids. By adopting the control system and the control method, the large-scale energy storage power station of the wind farm can be controlled, the voltage of the wind farm can be stabilized, the power output of a wind turbine generator or the wind farm can be smoothened, the safety of the power grid and the reliability and the flexibility in power supply in the region in which the wind farm is located can be improved and renewable energy resources can be further fully utilized.

The invention belongs to an energy conversion system and discloses a wave energy conversion system. The system comprises a collecting device, a conversion device and a generator set, wherein the collecting device is connected with the conversion device; the conversion device is connected with the generator set, the collecting device comprises a plurality of floating plates and a rack, and one ends of the floating plates are hinged to the rack and connected with the conversion device; the conversion device comprises a hydraulic cylinder, a pressure collecting cylinder and a hydraulic motor, a pressure shaft is connected with a piston of the hydraulic cylinder, fluid flows into the pressure collecting cylinder from the hydraulic cylinder, and the fluid flowing out of the pressure collecting cylinder drives the hydraulic motor to rotate; and the generator set is connected with the hydraulic motor and is driven to generate power by the hydraulic motor. By means of the structure, the wave energy conversion system can continuously and stably convert wave energy into electric energy and output the electric energy, the use efficiency of the wave energy is effectively improved, and the safety and stability of the system is improved.

An internal combustion engine that can be operated in compression ignition mode, comprising a fuel injector (2) for each cylinder; a fuel injection control unit (4) for controlling fuel injection quantity and a piston (5) in each cylinder whose compression action causes a mixture of air and fuel to be ignited. The engine is further provided with inlet and outlet valves (6, 7) and sensors (12-16) for measuring various engine operating parameters, is disclosed. During compression ignition mode, the control unit controls the fuel injector to perform a first fuel injection before, and a second fuel injection after top dead center of the piston stroke during or after a negative valve overlap period. A method for operating the engine and a computer readable storage device (4) having stored therein data representing instructions executable by a computer to implement a compression ignition for an internal combustion engine is also described.

The invention discloses a control method of an AC / DC two-way power converter used for an AC / DC hybrid micro-grid, and belongs to the technical field of electronic pulse width modulation of electric power. The control method particularly comprises the steps that when the AC / DC hybrid micro-grid operates in a networking mode, constant voltage is adopted to control a DC micro power source, constant power is adopted to control an AC micro power source, and therefore the two-way power converter transmits rated power to the micro-grid; when the AC / DC hybrid micro-grid operates in an islanding mode, constant voltage and constant frequency are adopted to control the AC micro power source, constant voltage is adopted to control the DC micro power source, and therefore active power between AC / DC micro-grids is balanced. On the basis of voltage control, the control item of the active power is introduced, the power flow between the AC / DC micro-grids is effectively balanced, and the stability and controllability of system networking operation and islanding operation are improved.

The invention discloses a control method for stabilizing power fluctuation of a wind power generating set and belongs to the technical field of wind power generation. The control method comprises the following steps of: 1, setting a battery management mechanism of a vanadium ion redox battery energy storage system; 2, regulating active power of the wind power generating set by using a first-order Butterworth low-pass filter; 3, determining active power compensated or absorbed by the vanadium ion redox battery energy storage system; 4, controlling transducers in a wind power generator and a single battery; 5, performing stabilizing control on grid-connected power of the whole wind power generating set by using the independent vanadium ion redox battery energy storage system; and 6, establishing a power control model of the vanadium ion redox battery energy storage system. The control method for stabilizing the power fluctuation of the wind power generating set has the advantages that: the stability of a grid-connected wind power generating set is improved; the control method is easy to realize; the problem that a strongly coupled system is difficult to control is solved; the stability of the wind power generating set can be effectively improved after the system has a fault; and the power output of the wind power generating set can be stabilized under quick disturbance of wind, so that the impact of the power fluctuation on a power grid is reduced.

The invention relates to an adjustable height type full hydraulic driving chassis of a high-ground-clearance mist spraying machine and a hydraulic system of the adjustable height type full hydraulic driving chassis. The adjustable height type full hydraulic driving chassis comprises a frame, a front supporting leg, a rear supporting leg, a front axle, a spraying rod spraying frame, a chassis lifting system, a travelling hydraulic driving system, a power system and a hydraulic assisting turning system. The adjustable height type full hydraulic driving chassis is characterized in that the frame is arranged at the upper parts of the front supporting leg and the rear supporting leg; the front axle is arranged between the frame and the front supporting leg; the spraying rod spraying frame is hinged to the frame; the chassis lifting system comprises a vertical rod telescoping sleeve, a vertical column, a hydraulic pump, a lifting hydraulic cylinder, a hydraulic control one-way valve and a manual operating valve; the travelling hydraulic driving system comprises a hub hydraulic motor, a variable pump, an oil supplementing pump, an one-way valve, a safety valve, an oil supplementing overflowing valve, a backpressure overflowing valve and a shuttle valve; the power system is fixedly mounted on the frame; the hydraulic assisting turning system comprises a hydraulic pump, a speed regulating valve, a follow-up valve and a turning oil cylinder. The adjustable height type full hydraulic driving chassis is simple in structure, stable in power output, wide in height adjusting range, and high in stability, and meets the demand of plant protection of crops at different growth periods and in planting lands with different height.

The invention relates to a wind power cluster trajectory prediction and hierarchical control method comprising: predicting ultra-short-term wind power based on spatial correlation and NWP data according to a wind power cluster and a topological structure in a wind power field; dividing a control process spatially into a cluster optimization scheduling layer, a field group coordination classification layer and a single field automatic execution layer according to a scheduling value issued by a scheduling center, and refining a wind power predicted value step by step over the time; in the fieldgroup coordination classification layer, classifying a wind power field based on the wind power predicted value into a upper climbing group, a lower climbing group, a stable group and a oscillation group; in the single field automatic execution layer, determining increasable wind power space based on AGC unit lower rotation spare margin and wind power sending section margin, and increasing the output of the upper climbing group wind power field or reducing the output of the lower climbing group wind power field; and based on a wind power field operation and monitoring system, calculating and feeding back the wind power error based on a wind power field actual value, and correcting the wind power cluster and wind power field predicted value, and making the optimization process accurate.

Embodiments of the present disclosure generally relate to apparatus and methods for preventing power dips associated with power ramping in wind turbines. One embodiment of the present disclosure provides a method for stabilizing power output in a wind turbine, which includes tracking a rate of change in an external reference, such as an external power reference or external torque reference, computing a feed-forward pitch angle adjustment according to the rate of change in the external power reference, and sending the feed-forward pitch angle adjustment to the wind turbine to adjust a pitch angle of rotor blades simultaneously with adjusting power output according to the external reference.

A versatile self-walking corn green feed harvester belongs to the technical field of crop harvesting and green feed harvesters. The versatile self-walking corn green feed harvester is characterized in that a power transmission system comprises a motor (26); a front end power output wheel (27) is connected to one side of the motor (26); a rear end power output wheel (28) with a clutch device is connected to the other side of the motor (26); the front end power output wheel (27) is connected with and drives a front wheel walking device for transmission; while driving the transmission device of a farm returning machine for transmission, the rear end power output wheel (28) is connected with and drives a harvesting and crop conveying transmission device and a straw cutting conveying transmission device by a main gap bridge axle (29) as well as a main gap bridge axle left transmission wheel (30) and a main gap bridge axle right transmission wheel (31) which are arranged at two sides. The versatile self-walking corn green feed harvester is more stable in power transmission, can realize multiple functions of corn harvesting, straw harvesting, cutting and storing and farm returning of straw cut stubbles and is high in production efficiency.

A light-emitting device and method for fabricating the same are revealed. The light-emitting device includes an epitaxial structure, a P-type ohmic contact electrode and an N-type ohmic contact electrode. The epitaxial structure includes a plurality of epitaxial layers capable of emitting light and P-type contact layer. The P-type ohmic contact electrode includes a first nickel layer deposited on the epitaxial structure, a first platinum layer deposited on the first nickel layer, and a first gold layer deposited on the first platinum layer. According to the fabricating method of the light-emitting device, an epitaxial structure is first formed on the surface of a substrate, a P-type ohmic contact electrode is then formed on the epitaxial structure, and an N-type ohmic contact electrode is formed on the other surface of the substrate. Finally, an annealing process is performed at a temperature between 220° C. and 330° C.

The invention relates to the laser field, in particular to the field of the laser and the amplifier. In the technical proposal, after the semiconductor laser array is aligned by a cylindrical lens, and the lath-shaped laser gain medium is directly pumped without focusing; the front end surface of the lath-shaped gain medium and a back-cavity mirror form a resonant cavity; and a prism or a prism pair in the cavity is used for compressing the beams in the direction of the long axis, thereby obtaining the laser output close to round spots. The invention can manufacture the outputs of various required lasers with high-power fundamental wave, frequency-doubling light, Q switching, continuous light and the like. As the high-power pump system reduces the influence of thermal effects, the invention can realize more stable power output and good beam quality. Therefore, the invention provides a high-power semiconductor pump laser or amplifier.

The invention discloses a 2FSK-based wireless energy and signal synchronous transmission system and method. The system is formed by a primary circuit and a secondary circuit. An energy emission circuit and an energy receiving circuit are both double resonance circuits. The primary circuit is provided with a 2FSK modulation circuit. The secondary circuit is provided with a 2FSK demodulation circuit. The 2FSK demodulation circuit includes two signal pickup loops. The two signal pickup loops are inductively coupled to the energy emission circuit. The resonant frequencies of the two signal pickup loops correspond to the two frequencies of high frequency inversion signals output by an inversion circuit respectively. Signals output from the two signal pickup loops demodulate digital signals emitted by the primary circuit through a voltage comparator. The substantial effects are that wireless energy transmission and information synchronous transmission are achieved, demodulated digital signals can be directly output without an MCU, the circuit structure is simpler, and the cost is lower.

The invention discloses a two-stage expansion piston air motor device. A reducing valve is connected with an air tank through a hose; one end of a throttling valve is connected with the reducing valve, and the other end of the throttling valve is connected with a valve port at the lower end of an electromagnetic reversing valve; the other valve port is connected with a transition air tank and a heat exchange system; two valve ports at the upper end of the electromagnetic reversing valve are connected with a first-stage cylinder; a piston rod in the first-stage cylinder is connected with the right end of a rack; the left end of the rack is connected with a second-stage cylinder; an upper cylindrical gear is arranged above the rack, and a lower cylindrical gear is arranged below the rack; the rack forms two pairs of gear pairs with the upper gear and the lower gear; two valve ports at the upper end of the electromagnetic reversing valve are connected with two working cavities of the second-stage cylinder through hoses; and a valve port at the lower end of the electromagnetic reversing valve is connected with the transition air tank and the heat exchange system through hoses, and theother valve port is connected with the external environment through a hose. An automobile power device which takes compressed air as a power source can drive a vehicle to run instead of petroleum, diesel oil or liquefied petroleum gas fuel, so that real zero emission of tail gas of automobiles is realized.

An electromagnetic driven micro ornithopter comprises a body, a piston cylinder, an AC power supply, upper and lower electromagnetic coils, a permanent magnet, left and wing motion bars, left wing and right wing rotation shafts, left wing and right wing frameworks and left wing and right wing fins, wherein the piston cylinder and the AC power supply are internally arranged in the frame of the body; the upper and lower electromagnetic coils are arranged at the upper and lower ends of the piston cylinder respectively; the AC power supply is connected with the upper and lower electromagnetic coils; a permanent magnet sleeve is positioned in the middle part of the piston cylinder; the permanent magnet is internally arranged in the permanent magnet sleeve; one end of the left motion pole and one end of the right motion pole are fixed to the left side and the right side of the permanent magnet sleeve and the other end of the left motion pole and the other end of the right motion pole are fixedly to the left wing rotation shaft and the right wing rotation shaft; the left wing rotation shaft and the right wing rotation shaft are fixed to the ends of the left wing framework and the right wing framework; and the right ends of the left wing fins and the left ends of the right wing fins are fixed to the left wing framework and the right wing framework respectively. According to the invention, the upper and lower electromagnetic coils are used for providing magnetic force, so that the flapping power output is doubled. The defect that the magnetic force of a single coil may be influenced by the travel distance is made up and the power output becomes more stable.

The invention belongs to the field of medical clinical technology, and particularly relates to a portable closed-loop brain deep part stimulator system with an intelligent adaptive function. The system is provided with 16 data acquisition channels and 4 stimulation channels. Four acquisition channels in the 16 data acquisition channels are used for encephalic LFPs acquisition, and 12 acquisition channels are used for extracranial signal acquisition. The output voltage of the stimulation channel has a modulable random waveform. In recording, stimulation is performed, thereby effectively reducing influence of a stimulus artifact to a recording signal and realizing stable driving voltage. The system circuit mainly comprises an MCU master control circuit, an LFPs acquisition channel, an external acquisition channel switch circuit, a low-amplitude voltage insulating input circuit, a low-pass filtering unit, a high-pass filtering unit, an industrial frequency filtering unit, an A / D conversion acquisition circuit, a WIFI communication unit, a four-channel output D / A circuit, a voltage isolating output driving circuit, a current detecting protecting circuit, an SD storing unit, etc. The portable closed-loop brain deep part stimulator system has advantages of compact structure, low power consumption, high working stability, small system size which is approximate to that of a palm, and high convenience in carrying.

The present invention relates to a hydraulic drive, particularly of a digger, particularly for a rotation system having a hydraulic circuit comprising a pump (1) and a motor (2), wherein a high-pressure reservoir (3) connectable to the pump and / or motor via at least one valve (4) and a control unit (6) controlling the at least one valve are provided.

The invention relates to an internal combustion engine provided with at least one cylinder and comprising a fuel injection system, an intake air charging system for supplying air under pressure to an air intake manifold, a controller for controlling the fuel injection system, a spark ignition system and the intake air charger. The control unit is adapted to switch the engine from a first combustion mode using a higher manifold pressure to a second combustion mode using a lower manifold pressure, and further adapted to control the intake air charging system to cause a surge in the intake air, in order to evacuate the higher manifold pressure. The invention further relates to a method for controlling the internal combustion engine and a vehicle provided with such an internal combustion engine.

The invention discloses a high-order odd harmonic THz source frequency multiplier, and aims to provide a frequency multiplier which is simple in structure, high in efficiency and capable of effectively providing terahertz signals. The high-order odd harmonic THz source frequency multiplier is implemented according to the technical scheme that an external radio frequency signal is inputted through a standard rectangular waveguide (1), gets into a local oscillator low-pass filter (3) through an input waveguide-microstrip transition structure (2) and then enters a Schottky diode. Meanwhile, the external part performs feed excitation on the Schottky diode through direct current feed of a fundamental wave low-pass filter (4). The Schottky diode performs frequency conversion on input fundamental waves to generate high-order harmonic waves which comprise odd harmonic components and even harmonic components, finally the high-order harmonic waves get into an output waveguide (7) through an output microstrip-waveguide transition structure (6), the waveguide is lowered, a high-pass filter for filtering the even harmonic waves is formed, and output is performed through the standard rectangular waveguide. The high-order odd harmonic THz source frequency multiplier solves a problem of realizing a terahertz signal source.

A domestic combined heat and power (dchp) unit includes a Stirling engine 1 to provide heat for a domestic dwelling along with a source of electrical power. Under normal operation, the dchp is supplied with power from the national grid. When there is an interruption in the mains power from the grid, the dchp switches into a grid independent mode wherein power is generated by the dchp and is supplied to a controller 26 and to a water pump so as to maintain integrity of heat supply to the dwelling; the remaining power after that is supplied to selected domestic electrically powered equipment such as lights or television sets. The invention also discloses methods for black start of the dchp during a mains power loss, and also modification of the operating voltage on start up of electrical equipment during a power loss, to prevent the Stirling engine stalling.

The invention discloses a nested tidal current generating set of an air guide sleeve paddle-changing horizontal shaft, and belongs to the field of ocean regenerative energy development. The generating set is composed of an outer air guide sleeve, an air guide sleeve support, an inner air guide sleeve, a main shaft, a main shaft bearing, a hub, a blade, a paddle-changing bearing, a paddle-changinggear, a paddle-changing rack, a paddle-changing motor, a storage battery, a generator, a gear box and seal; and the outer air guide sleeve and the inner air guide sleeve form the nested air guide sleeve, the roof of the blade realizes the blade paddle-changing through the paddle-changing motor. The nested tidal current generating set provided by the invention has the advantages that the blade neighbouring tide flow velocity is greatly improved through the nested air guide sleeve, a paddle-changing mechanism causes a horizontal shaft to be adapted to reversing current, the efficiency is obvious high, thereby having self-starting ability at different flow rates; a complete machine structure is concise, the electrical energy output is stable, thereby having cleanness and no pollution.

The invention discloses a wind turbine generator system self-adaptive inversion sliding mode optimized control method based on a high-order sliding mode observer. The method includes the steps that a,a mathematical model of a wind turbine generator system is established according to kinematics and dynamics theories; b, a self-adaptive inversion sliding mode controller of the wind turbine generator system is designed on the basis of the traditional optimal torque method design through inversion control, self-adaptive control, sliding mode control theories and the mathematical model; c, the system state is estimated online in real time through the high-order sliding mode observer, the power output is smoothened, and shake and vibration are reduced; d, parameter optimization is conducted onthe designed controller through a particle swarm algorithm to find the optimal control parameter; and e, self-adaptive inversion sliding mode control is conducted on the wind turbine generator systemthrough the self-adaptive inversion sliding mode controller with the control law. In this way, the problems that the wind turbine generator system has unknown parameters and bonded disturbance are solved, and robustness of the system is improved. Finally, the maximum power point tracing control of the wind turbine generator system in the low-wind-speed area is achieved.