54results about How to "Ensure constant power output" patented technology

Generally, the invention relates to power generation and energy storage. In particular, to systems and methods for providing constant power from hydraulic inputs having widely-varying pressures. More particularly, the invention relates to hydraulic-pneumatic energy storage and recovery systems that include either a fixed or variable displacement hydraulic motor and control systems that allow a user to maintain constant power from the fixed or variable displacement hydraulic motor.

A wind energy system comprising a wind turbine comprising a cowling surrounded by a diffuser and a plurality of inner rotor blades located inside of the cowling that rotate about an inner hub, a plurality of outer rotor blades positioned between the diffuser and the cowling that are counter-rotating relative to the plurality of inner rotor blades, a drive mechanism located within the inner rotor hub, a dynamic telescopic tower, and a tower support that connects the wind turbine to the dynamic telescopic tower.

The invention provides a wind turbine and a control method of the wind turbine. The wind turbine comprises blades, an engine compartment, a generator, a wind speed tachymeter and a control system, wherein the generator is arranged in the engine compartment, the wind speed meter is arranged on the upper portion of the engine compartment, and the control system is arranged in the engine compartment. The control system comprises a yaw system, a torque control module, a yaw control module and a converter, wherein the yaw system, the torque control module, the yaw control module and the converter are arranged on the lower portion of the engine compartment; when the wind speed is below a rated wind speed, the yaw system makes the wind turbine be aligned with the wind direction, and power is controlled by controlling the tip speed ratio; when the wind speed is above the rated wind speed, the yaw system makes the wind turbine be deviated from the wind direction, and motor power is kept at the rated power by controlling the rotating speed of the wind turbine. According to the wind turbine, a high-failure-rate variable pitch system is not used, so that the operational reliability of the wind turbine is improved, the design weight of the wind turbine is reduced, materials are saved, and cost is cut down.

The present disclosure describes a low-wind, dual-stage, vertical-axis, wind-generated power turbine comprising a structural support tower, at least four turbine assemblies stacked on top of one another within individual turbine bays, a central drive shaft connecting the turbine assemblies, a draft induction channel surrounding the drive shaft, a spiral blade running through the induction channel, a paddle turbine assembly at the base of the tower which propels the spiral blade, a blower source which powers the paddle turbine, a built-in solar system which feeds the blower, external, natural wind directional slats, and a high pressure, fluid-drive, Hydrabine turbine mechanically coupled to a transmission or CTV, coupled to a one Mega Watt output generator.

A detector is disposed on the passive side of a laser to detect photon leakage through the passive side mirror and measure as current created in the detector via a Schottkey contact.

The invention relates to a method for realizing variable voltage level constant power output of a converter. The method realizes the series connection and parallel connection of variable flow chains consisting of a plurality of variable frequency power units in an A phase, a B phase and a C phase in a plurality of transformation modes of combining the series connection and the parallel connectionof a plurality of identical variable frequency power units and through the opening and closing control for a switch, and simultaneously controls the consistency of the current, the voltage amplitude,the frequency and the like output by each variable frequency power unit, thereby realizing the increase of the output current when the output voltage is decreased, and achieving the constant power output of a plurality of needed voltage levels, i.e. realizing variable multivoltage level constant power output on one converter. The converter is based on a multilevel H bridge series connection technology. The converter can be a four-quadrant converter or a two-quadrant converter or a one-quadrant converter and is depended on the circuit structures of the variable frequency power units, and a controllable rectifying device or an inverter of each variable frequency power unit can be an IGBT, an IGCT, an IEGT, or a PP IGBT.

The invention discloses a plan for a driver (a ballast) of a gas discharge lamp, which is a device that is arranged on a single resonant circuit. The device utilizes a clockwise method and a flyback method simultaneously, also utilizes a resonant circuit to generate a high frequency alternating current power source for driving the gas discharge lamp, and comprises a transformer, a switch tube, a resonant capacitance, a pulse control circuit and an abnormity control circuit; wherein, the transfomer generates high frequency alternating current under the action of the switch tube, and makes the circuits generate resonance under the action of the resonant capacitance for outputting high frequency quasi sine wave. When controlled by the pulse control circuit, the transformer also outputs basically constant high frequency power within the range of wide voltage inputting. When alternating current is inputted, the device also comprises a rectifying circuit, a filtering circuit, a power factor correction circuit, etc.

A method for reducing vibrations of a wind turbine includes a plurality of set points characterizing set values of operation parameters of the wind turbine. The method includes measuring an acceleration force value corresponding to acceleration forces acting on the turbine, and determining whether the measured acceleration force value is above a predetermined threshold value. Furthermore, in case it is determined that the acceleration force value is above the predetermined threshold value, the set point value of at least one set point of the plurality of set points is modified in order to reduce the vibrations in such a way that a power output of the wind turbine is not reduced.

A power-saving and stabilizing ballast includes a bridge rectifier circuit, an electrolytic capacitive filter circuit, a half bridge inverter circuit, and an LC output circuit, all of which are sequentially and electrically connected. An EMC filter circuit is electrically connected between a voltage input port and the bridge rectifier circuit for restraining high frequency currents from damaging electric power. A power factor correction circuit is electrically connected between the bridge rectifier circuit and the electrolytic capacitive filter circuit for enhancing power factor, reducing harmonic and achieving a constant power output. An abnormal state protection circuit is electrically connected to the half bridge inverter circuit for protecting the ballast against damage from abnormal states. The ballast is also capable of resisting transient spikes or strong thunder and lighting interferences from electric power, and suppressing surge currents effectively. The ballast has multi-loads output and start delay for prolong the lives of lamps or lanterns with such ballast.

The invention provides an impedance matching circuit and an impedance matching method of a power amplifier based on power line carrier communication. The power line carrier communication comprises a signal modulator, a transmission end filter, the power amplifier and a first coupling transformer which are positioned at a transmission end and comprises a second coupling transformer, a receiving end filter, a signal modulator and a signal processor which are positioned at a receiving end. The impedance matching circuit of the power amplifier comprises a change-over switch, an impedance detecting unit and a switch control unit, wherein the impedance detecting unit is used for detecting load impedance of power lines, and the switch control unit is used for controlling changing-over of the change-over switch to adjust coil turn ratio of the first coupling transformer according to detecting results of the detecting unit so as to achieve mutual match of the load impedance of the power lines and impedance of the power amplifier. Compared with the prior art, the impedance matching circuit has the advantages of simple structure, convenience to control and the like.

The invention relates to the field of fuel cell system control, in particularly to a control method of a fuel cell system of a hybrid electric vehicle. According to the control method, under the situation that the fuel cell system has no power output on the whole vehicle, a fuel cell is still controlled to output at the set power, wherein the set power is not less than the power for maintaining work of fuel cell accessories, starting of the fuel cell is ensured, by obtaining the actual demanded power of the whole vehicle, the SOC of a power cell, the single body temperature and the single bodyvoltage, the actual demanded power and the steady-state charging power allowed by the power cell are obtained, finally, the set power of the whole vehicle on the fuel cell is obtained, it is ensuredthat the overcharging phenomenon of the power cell is avoided, meanwhile, constant power output of the fuel cell and balance of the SOC of the whole vehicle are ensured, frequent starting-stopping andload varying of the fuel cell are avoided, the life of an electric pile of the fuel cell is prolonged, the durability of the electric pile of the fuel cell and the power cell safety are improved, andoperation is more convenient.

The present invention relates to a method and an apparatus for controlling the drive system for mobile equipment, when the operator's drive commander is kept constant, electric traction motors are controlled by a torque controller to provide uniform torque, deviations in speeds of the electric traction motors are determined and electric motor power of at least one is varied relatively to the electric motor power of the other in response to a determined deviation in speed to keep the torques uniform. The power control balancing compensates for the torque differences previously encountered when the speeds of the traction motors differ at equal power supplied to the traction motors.

A self-excited power conversion circuit for secondary side control output power includes a comparator unit and a transistor installed directly in a secondary side output module, and the comparator unit is electrically coupled to at least one load, and the transistor is electrically coupled between to a conversion module of the circuit and the load. The comparator unit is provided for adjusting the duty cycle of the transistor after detecting the amount of energy outputted from the conversion module to the load from, so as to adjust the amount of energy actually received by the load to achieve a constant power effect.

The invention discloses a torque detecting device and a detecting method used in a tractor gearbox inner cavity. The torque detecting device comprises main and auxiliary box signal disks, main and auxiliary box detecting sensor, a main box signal disk spline sleeve, a gearbox case, front and rear bearings, a flexible signal shaft, a power output shaft 7, a power output drive gear, a power output driven gear, a power output shaft bearing, a controller, and the like. The torque detecting device consisting of the above components is installed inside a tractor gearbox, performs measurement and feedback of the torque and the rotation speed through a detection system and a sensor analysis system to monitor the change of the working rotation speed and the torque of the tractor in real time, can effectively control the reasonable range of the rotation speed difference and the size range of the inertia moment during a matching and gear-shifting process, can accurately calculate the power outputof the engine and the rotation speed of the tractor to achieve real-time monitoring of the output power of the tractor, can effectively adjust the reasonable gear-shifting timing of the tractor, canimprove the gear-shifting quality of the power gear-shifting of the tractor, and can ensure the constant power output of the engine.

A method of controlling a wind turbine having a rotor to which at least one rotor blade is connected, is provided herein. The method includes operating the rotor according to a first rotational speed reference; and operating the rotor according to a second rotational speed reference above the first rotational speed reference, if a fluctuation of an actual rotational speed of the rotor decreases below a fluctuation threshold and/or if a blade pitch angle of the rotor blade increases above a blade pitch angle threshold. The method may further include wherein the rotor is operated according to the first rotational speed reference, if the fluctuation of an actual rotational speed of the rotor increases above another fluctuation threshold which is above the fluctuation threshold and/or if the blade pitch angle of the rotor blade decreases below another blade pitch angle threshold which is below the blade pitch angle threshold.

The invention relates to a multiple-protection constant-power-output electronic transformer. The electronic transformer is provided with power-end over-voltage protection and load-end overload protection, and is provided with special half-bridge inverter constant power control. According to the power-end over-voltage protection, when the voltage of a power supply is too high and exceeds a protection threshold, a half-bridge inverter stops working, and the output voltage drops to zero. According to the load-end overload protection, when the load is abnormal or over, an overload signal detected by a detection point P drives an execution circuit to start working to make the inverter stop oscillation and interrupt the output, thus protecting the electronic transformer and avoiding fault expansion. According to the half-bridge inverter constant power control, an independent active discharge circuit is arranged to enable the discharge path of a starting capacitor C9 not to pass through an inverter MOS tube so as to form independent constant-pulse trigger of the inverter and guarantee constant-power output.