147results about How to "Reduce power fluctuations" patented technology

A laser system that includes a diode pump source. A frequency doubled solid state visible laser is pumped by the diode pump source and produces a pulsed laser output with a train of pulses. Resources provide instructions for the creation of the pulsed output, with on and off times that provide for substantial confinement of thermal effects at a target site. This laser system results in tissue specific photoactivation (or TSP) without photocoagulation damage to any of the adjacent tissues and without causing full thickness retinal damage and the associated vision loss.

A laser system that includes a diode pump source. A frequency doubled solid state visible laser is pumped by the diode pump source and produces a pulsed laser output with a train of pulses. Resources provide instructions for the creation of the pulsed output, with on and off times that provide for substantial confinement of thermal effects at a target site. This laser system results in tissue specific photoactivation (or TSP) without photocoagulation damage to any of the adjacent tissues and without causing full thickness retinal damage and the associated vision loss.

A device, mounted on a hydraulic excavator, for allowing each of first and second electric motors (13), (14) to generate power by using electric power supplied from a power supply having a predetermined capacity, and actuating a boom cylinder (6), an arm cylinder (7), etc. using the generated power. The device is characterized by comprising electric motor controllers (24), (25), etc. for respectively controlling power that is generated by the electric motors (13), (14) so that, in machine-operation, powers generated by the electric motors (13), (14) may be equal to or less than predetermined rated outputs, and that the total amount of powers generated simultaneously by the electric motors (13), (14) may correspond to the maximum capacity of the power supply, so as to prolong the time of use with high thrust and high torque without increasing the capacitors of the electric motors (13), (14) and power supply.

System for producing electric energy and hydrogen based on renewable energy sources, such as wind energy from one or several wind turbines, and incorporating means for producing hydrogen. The system comprises a hybrid electrolyzer device, which comprises a combination of at least two different electrolysis technologies and at least one control device, which manages the hydrogen production between the two electrolyzers of the different electrolysis technologies; being at least one electrolyzer of a rapid dynamics electrolysis technology type and, at least the second one of a substantially slower dynamics electrolysis technology type.

The invention discloses a parameter matching joint optimization method of a fuel cell hybrid tramcar. The method includes: according to operation needs and target route conditions, designing tramcar power system indexes and tramcar operation conditions and determining the parameter feasible region of a fuel cell hybrid power system to form a preliminary parameter matching alternative scheme; usingwhole life cycle cost, service time and the power performance of the whole tramcar as the optimization targets to build a multi-target optimization function, using the self-adaptation swarm intelligent optimization algorithm based on probability indexes to complete load allocation under optional parameter combination, and using the load allocation when the value of the multi-target optimization function is minimum as the optimal allocation result under the parameter matching combination; traversing all alternative parameter combinations, and searching for the global optimum on the basis of the individual optimum to complete the optimal parameter matching optimization calculation of the fuel cell hybrid tramcar. By the method, hydrogen consumption can be reduced effectively, the efficiencyof the whole tramcar can be increased, and optimal economical efficiency during operation can be achieved.

The present invention relates to a power system having a plurality wind turbine generators and a power plant controller arranged to communicate with the plurality of wind turbines generators, where each of the plurality of wind turbine generator being related to a wind turbine controller, the wind turbine controller being arranged to control an active power output in its related wind turbine generator according to an active power set point received from the wind power plant controller; a first subset of wind turbine generators operating at an active power output unrestricted of the active power set point; and a second subset of wind turbine generators operating according to an active power set point; and wherein the wind power plant controller communicates the active power set point, in accordance with the active power output of the first subset of the plurality of wind turbines generators, so as to reduce active power fluctuation of the aggregated active power output of the first and second subset of the plurality of wind turbines generators. The present invention also relates to method accordingly.

The invention discloses a microgrid energy scheduling method based on double-Q-value network deep reinforcement learning, and the method comprises the steps: taking one-day prediction information of amicrogrid as a training set for generating an optimal control strategy, and training an intelligent agent which is independent of a microgrid environment and takes an energy storage system as a control object; and achieving double optimization objectives of minimum operation cost of the microgrid and minimum power fluctuation of the public power grid by controlling charging and discharging actions of the energy storage system. The method does not depend on the construction of a specific micro-grid model, and the strategy is guided by the design of the reward function to achieve the purpose ofmicro-grid operation, so that the optimal strategy of global time can be obtained, and the power imbalance caused by uncertainty of new energy power generation and user load distribution can be effectively solved.

The invention discloses a control method of a hybrid energy storage system for stabilizing the power fluctuation of an intermittent type power source, comprising the following steps of acquiring the real-time power of the intermittent type power source, the synthetic output power of power and stored energy, the SOC (State of Charge) of a battery and the voltage of a supercapacitor by a data acquisition module, and sending data to a stabilizing and control module; processing the data in the stabilizing and control module and judging whether the power output is needed or not according to a fluctuation power; and in the case of needing power output, outputting a control power instruction and a charge / discharge instruction, and carrying out output by the energy storage system according to the control instruction, wherein electric energy output by the energy storage system passes through PCS (Power Converters), is synthesized with the output of the intermittent type power source through a circuit breaker respectively and merges into a power grid through a transformer. By the adoption of the control method of the hybrid energy storage system for stabilizing the power fluctuation of the intermittent type power source, the defects that when the power fluctuation of the intermittent type power source is stabilized by the prior art, as the energy storage system mainly adopts a single energy storage medium, the ability of stabilizing the power fluctuation of the intermittent type power source is weak and the service life of an energy storage element is shorter are overcome; and therefore, the practicability and the economical efficiency are enhanced.

The invention discloses a multi-power-section parallel connection quick charging system and method. The multi-power-section parallel connection quick charging system comprises multiple charging piles. The adjacent charging piles communicate with one another and are electrically connected through connectors. Each charging pile comprises a controller and a convertor. The controller of each charging pile communicates with a device to be charged, the maximum charging power of the device to be charged is obtained, and the charging piles meet the requirement of the device to be charged for the maximum charging power in the manner that the adjacent charging piles are connected in parallel according to the maximum power of the charging piles and the maximum charging power of the device to be charged. On the basis that the output power of the charging piles is not increased, a charging station can meet the requirements of more types of charging automobiles.

A device, mounted on a hydraulic excavator, for allowing each of first and second electric motors (13), (14) to generate power by using electric power supplied from a power supply having a predetermined capacity, and actuating a boom cylinder (6), an arm cylinder (7), etc. using the generated power. Electric motor controllers (24), (25), respectively control power that is generated by the electric motors (13), (14) so that, in machine-operation, powers generated by the electric motors (13), (14) may be equal to or less than predetermined rated outputs, and the total amount of powers generated simultaneously by the electric motors (13), (14) correspond to the maximum capacity of the power supply.

A piezoelectric microspeaker using microelectromechanical systems (MEMS) and a method of manufacturing the same are provided. The piezoelectric microspeaker includes a piezoelectric layer disposed on an elastic thin layer, and a resonance change unit patterned on one of a bottom surface of the elastic thin layer and a top surface of the piezoelectric layer.

The invention relates to a fan grid-connected control method based on virtual synchronous generator parameter adaptive control. An AC bus output by a wind power plant is connected with a control system in parallel. The control system comprises an energy storage device, an inverter, a voltage sensor, a current sensor, a self-adaptive active-frequency control module, a reactive-voltage control module, a virtual impedance control module and an SVPWM control module, wherein the energy storage device is connected in parallel to an alternating current bus output by a wind power plant through an inverter; the voltage sensor and the current sensor respectively acquire the voltage of the grid-connected end of the control system and the wind power plant and the current output by the energy storage device, and inputs the voltage and current into the adaptive active-frequency control module, the reactive-voltage control module, the virtual impedance control module and the SVPWM control module forcalculation to obtain a driving signal of the inverter; and the output of the energy storage device is controlled to perform fan grid-connected control. The method is beneficial to improving the rapidity and stability of fan grid-connected control.

The invention discloses a multi-objective optimization system and a multi-objective optimization method containing a composite energy storage micro grid. The multi-objective optimization system containing a composite energy storage micro grid is composed of a micro grid central controller, an energy storage controller, a photovoltaic controller, a load controller, and a communication network. According to the multi-objective optimization method containing a composite energy storage micro grid, a multi-objective optimization model is established for a grid-connected composite energy storage micro grid including photovoltaic batteries, flow batteries, lithium batteries and other energy storage devices, with the purpose of minimizing micro grid electricity purchasing cost and tie line power fluctuation. The weighting coefficient is determined based on a two-person zero-sum game method, and the model is converted into a single-objective optimization problem and solved using a linear weighted method. By adopting the multi-objective optimization system containing a composite energy storage micro grid, the utilization rate of renewable energy of the micro grid can be maximized effectively, tie line power fluctuation and distributed power supply grid-connected operation shock can be reduced, and the economical efficiency of micro grid operation can be improved.

The present invention relates to a method of operating a wind power plant, with at least one wind turbine generator connected to an electrical grid, wherein the method comprises the steps of monitoring a frequency parameter and comparing it with a frequency set point, as to select a low or high frequency event and determining a power reference to the a least one wind turbine generator, based on the frequency parameter, In case a high frequency event is detected, the power reference is determined as a minimum of a selection of at least a first and a second minimum power reference. And in case a low frequency event is detected, the power reference is determined as a maximum of a selection of at least a first and a second maximum power reference, dispatching the power reference to the at least one wind turbine generator. The invention also relates to a wind power plant operating according to the method.

The invention relates to a tamping wagon photoelectric measurement system and a method. The system comprises a front measurement trolley, a middle measurement trolley, a rear measurement trolley, an optical imaging lens, CCD cameras and an illuminating light source, as well as an embedded processing platform and a signal cable, wherein the CCD cameras are connected with the embedded processing platform through the signal cable which contains synchronous signal wires ensuring that four CCD cameras start to shoot images at the same time; the embedded processing platform sends out a signal for the four CCD cameras to sample images synchronously through the signal cable; and the four CCD cameras send data of images which are shot synchronously, correspond to the illuminating light source and are imaged by an optical imaging lens to the embedded processing platform for coupling analysis, and the geometric position of a track circuit is calculated. The tamping wagon photoelectric measurement system can better adapt to the on-site requirement of the tamping wagon, and improves the measurement accuracy.

The present invention provides a maximum power point tracking method and device and a photovoltaic power generation system. The maximum power point tracking method comprises: sampling present voltage and present current of a photovoltaic array; obtaining present power based on the present voltage and the present current; using difference between the present power and power for previous sampling time as present perturbation power, and based on ratio of the present perturbation power to perturbation power for previous sampling time, obtaining gradient perturbation voltage step ratio; obtaining perturbation voltage step based on the gradient perturbation voltage step ratio and voltage difference between the present voltage and the voltage for previous sampling time; and controlling output voltage based on the perturbation voltage step.

The invention provides a high-gain and low-noise differential trans-impedance amplifier. The high-gain and low-noise differential trans-impedance amplifier comprises a current mirror, an adjusting type common-emitter and common-base trans-impedance amplifier and an output common-source amplifier, wherein the adjusting type common-emitter and common-base tarns-impedance amplifier comprises a common-base amplifying unit and a negative feedback common-emitter amplifying unit; the negative feedback common-emitter amplifying unit is arranged between an emitter and a base of the common-base amplifying unit and serves as a negative feedback channel; input current is copied by the current mirror in an equal proportion manner; the current mirror provides bias voltage for the common-base amplifying unit and the negative feedback common-emitter amplifying unit; the output common-source amplifier is connected between an output end of the adjusting type common-emitter and common-base trans-impedance amplifier and an output end of the high-gain and low-noise differential trans-impedance amplifier; and trans-impedance gain is increased. By the high-gain and low-noise differential tarns-impedance amplifier, received weak signals are amplified in a high-gain and low-noise manner, bandwidth is large, and a dynamic range of inputted current signals are reasonably set; and the high-gain and low-noise differential tarns-impedance amplifier has the advantages of easiness in design and monolithic integration.

The present invention relates to a load-frequency control method of a multi-domain time-lag electric power system with high wind energy permeability. The method comprises the following steps: S1, establishing a time-lag electric power system with multiple domains, and establishing the mathematics model of each generation system; S2, establishing state models with uncertain items corresponding to each domain according to the mathematics model of a generator; S3, designing an integration type sliding mode surface [Sigma]I (t) according to the state models with uncertain items; S4, designing the sliding mode load frequency controller according to the integration type sliding mode surface [Sigma]I (t); and S5, taking a controller ui(t) obtained in the step S4 as a controlling instruction, and optimizing the load frequency offset of the electric system. Compared with the prior art, a wind driven generator participates the regulation of the system frequency to tightly cooperate the wind power generation with the traditional fire power generation, and the increment of the output power of each generator is evenly reduced to ensure the power supply and demand balance of each area and effectively reduce the frequency offset of each area.

The invention discloses a method for coordinated optimization control of energy of multi-modal micro-grids and relates to the field of power grid energy control. The method solves a problem that a large amount of multiple types of distributed power supplies are connected to power grids at all levels to have fluctuations and lack optimization control of the energy of the power grids at all levels. The micro-grids in three modes all have diversity load and other disturbances sources, such as wind power generation, solar photovoltaic power generation and electric vehicles, so that the power fluctuations in various forms can occur at any time and even the distributed power supply output changes intermittently, a coordinated optimization control strategy of local balance on the spot, regional mutual supply and overall absorptive decomposition which are linked with a substation level, a feeder level and an area level is adopted, the controllable distributed power supply output, the controllable load energy power and charging and discharging of an energy storing device are adjusted orderly, and the effects of reasonable energy distribution, multivariate complement and comprehensive utilization are realized finally. The method is used for power grid energy control.

The invention discloses a single-ended chaotic Brillouin dynamic strain measuring device and method based on Rayleigh scattering, aiming at meeting the current requirements of long-distance, high-resolution, large dynamic range and real-time and rapid application of distributed sensing and simultaneously solving the problem that a system cannot work when a breakpoint occurs because a pump light and a detection light need double-end incidence in a Brillouin optical coherence domain analysis system. A continuous light output by a light source is divided into two paths through a coupler, one pathis used as the pump light, the other path is subjected to double-sideband modulation through a high-speed electro-optic modulator, a backward Rayleigh scattering light is used as the detection lightand generates stimulated Brillouin scattering with the pump light, and a corresponding dynamic strain value is demodulated through a corresponding relation between intensity information acquired by ahigh-speed data acquisition system and strain. The single-ended chaotic Brillouin dynamic strain measuring device is simple in structure and low in cost, can effectively reduce signal power fluctuation, and realizes dynamic strain measurement with single end, high spatial resolution, long distance and good stability.

The invention aims to provide a particle algorithm-optimized composite power supply electric vehicle power distribution strategy. According to the technical schemes, after a vehicle control model is established according to a vehicle-mounted composite power supply control system, required power is divided into different frequency bands; the required power is borne by different energy types according to the different frequency bands; and a particle algorithm is used for optimizing a distribution strategy, so that an optimal control strategy of multi-energy power distribution can be obtained. Onthe premise that the load requirement of a whole vehicle is met, a fuel cell is better protected, and the advantages of three kinds of energy are brought into full play; in addition, a self-adaptivefilter is adopted to replace traditional constant-value filtering, so that the role of a super capacitor in rapidly providing instantaneous high power is better played, and the charging and discharging process of the super capacitor is protected; a fuzzy controller in the control strategy is subjected to parameter optimization by adopting the particle swarm algorithm, so that the control effect inthe aspects of reducing the power fluctuation of the fuel cell and reducing the hydrogen consumption of the fuel cell is better.

The invention discloses a new energy storage optimization configuration method. The new energy storage optimization configuration method comprises the steps of building a new energy storage optimization configuration model by combining an output power of a new energy power generation system, energy power characteristic of an energy storage system and load consumption power; building a target function by taking minimum cost of the energy storage system and minimum power fluctuation of a new energy power generation system as targets; determining a constraint condition of the energy storage system; and solving the new energy storage optimization configuration model by a genetic algorithm, and outputting an optimal solution. According to the method, the new energy storage optimization model taking minimum comprehensive cost of the energy storage system and minimum power fluctuation of the new energy power generation system as the target function and simultaneously considering various constraint conditions is built on the basis of spectral analysis on the load power, and the built model is more comprehensive; and the new energy storage optimization configuration model is solved by the genetic algorithm, the optimization configuration scheme is preferably determined, and the actual demand is more satisfied.

The invention provides an energy dynamic control system and method of compound power supply EPS. Firstly, the real-time working current of vehicle electric appliances (except for a steering motor anda super-capacitor) is acquired, the target current of the steering motor is calculated through the current steering wheel torque and the vehicle speed, and the charging and discharging state of the super-capacitor is judged through the difference value between the rated current of an electric generator and the sum of the real-time working current and the target current. When the super-capacitor ischarged, charging current is dynamically adjusted, so that the electric generator is in the optimal working interval, and the largest charging current of the super-capacitor is limited on the basis of the current SOC of the super-capacitor; and when the super-capacitor is discharged, discharging current is dynamically adjusted, so that the electric generator is in the optimal working interval, and the largest discharging current of the super-capacitor is limited on the basis of the current SOC of the super-capacitor. Through a super-capacitor charging and discharging control strategy designedon the basis of the method, on the premise that an EPS use function is met, the electric generator can be in or close to the optimal working interval as much as possible under any working condition,so that the energy conversion efficiency is improved, and energy consumption is reduced.

Particular embodiments of the present invention relate generally to semiconductor lasers and laser scanning systems and, more particularly, to schemes for controlling semiconductor lasers. According to one embodiment of the present invention, a laser is configured for optical emission of encoded data. At least one parameter of the optical emission is a function of a drive current IGAIN injected into the gain section of the semiconductor laser and one or more additional drive currents I / VPHASE, I / VDBR. Mode selection in the semiconductor laser is altered by applying a phase shifting signal I / VΦ to the phase section that is synched with a wavelength recovery portions in drive current IGAIN such that a plurality of cavity modes are shifted by one half of the free spectral range at each wavelength recovery portion. In this manner, patterned variations in the wavelength or intensity profile of the laser can be disrupted to disguise patterned flaws that would otherwise be readily noticeable in the output of the laser.

The invention realizes a measurement system for optical element transmittance and reflectance based on acousto-optic modulation, which is mainly used for solving the problem that the prior art is not high in measurement accuracy. The measurement system disclosed by the invention comprises a continuous laser, an optical path control chamber, an photoelectric amplification module, a feedback control module, a measurement rotary table and a parameter measurement module; the laser outputs laser with power to be stabilized; the laser outputted by the laser is radiated to a detector in a perpendicular manner after passing through the optical path control chamber to generate a current signal which is amplified by the photoelectric amplification module into a voltage signal; the feedback control module processes the voltage signal to obtain an feedback signal in order to control an acousto-optic demodulation driving device to adjust an acousto-optic demodulator to stabilize the laser power; the highly stable laser enters the optical member to be detected; and the laser power is obtained through measuring transmittance and reflectance of the optical member to be measured to calculate the reflectance and transmittance of the optical member to be measured. The invention is high in measurement accuracy and easy in operation.

The invention discloses a load smooth control method based on a demand side resource unified state model. Firstly the demand side resource unified state model is established, and then load curve smooth control is realized based on the model. The response characteristics of different types of demand side resources can be described by using a unified mathematical expression by the unified state model; a control matrix is derived to realize real-time management and control of the demand side resource output power on the basis of considering the response order of the demand side resources; fully consumption and absorption of renewable energy sources can be realized by a control strategy on the basis of considering the energy using comfort level of the user so that the SOC before traveling of the electric automobile is ensured to meet the user requirements, and the indoor temperature in which the temperature control load is located is ensured to meet the comfort requirements of the user; and power fluctuation of the load can be obviously reduced by the control, and the power fluctuation rate can be maintained to be below 10% of the preset value.

A power balanced photonic RF phase shifter includes: a microwave drive; a phase controller operably connected to the microwave drive; and a linearizing arm connected in parallel with the microwave drive, the linearizing arm operating under a bias voltage, Vlin, that is controlled such that power variations of the photonic RF phase shifter are mitigated. In a preferred embodiment, the bias voltage, Vlin, is controlled to keep an optical phase of the photonic RF phase shifter at a constant value. In a preferred embodiment, the microwave drive, the phase controller and the linearizing arm comprise (three) Mach-Zehnder modulators.

The invention discloses an electronic control diesel-methanol dual-fuel engine control system and method based on the EGR technology and relates to the field of internal combustion engines. The electronic control diesel-methanol dual-fuel engine control system comprises an air inlet system, an air discharging system, an EGR system, a diesel supplying system and a methanol supplying system. The airinlet system is used for providing fresh air for an engine. The EGR system is used for leading waste gas obtained after combustion into an air inlet manifold. The diesel supplying system is used forproviding the fuel diesel. The methanol supplying system is used for providing the fuel methanol, and the methanol is sprayed into the air inlet manifold. The control system comprises a diesel ECU, amethanol ECU, a sensor and CAN communication, the two ECUs share signals in real time through the CAN communication, the methanol supplying amount and the diesel supplying amount are adjusted in a linked manner, and therefore mode and work condition stable transition can be achieved. By means of the electronic control diesel-methanol dual-fuel engine control system and method based on the EGR technology, high-temperature waste gas is used for accelerating vaporization of the methanol, the quality of the methanol mixed gas is improved, the temperature and the pressure rise rate in a cylinder are controlled, NOx discharging and detonating are inhibited, and finally clean and efficient combustion of the double-fuel engine is achieved.

A shift register is provided, which adopts a shift operation delay for each memory device, or a data conversion control system through the estimation of conversion of data storage state. A driver circuit of LCD is provided, which adopts such a shift register, to thereby prevent instantaneous increase of electric power consumption while preventing EMI.Accordingly, shift registers operate as being sequentially delayed for each memory device or data conversion is minimized, thus preventing instantaneous excessive consumption of electric power.