53 results about "Generation loss" patented technology

The invention discloses a zero sample image classification method based on combination of a variational autocoder and an adversarial network. Samples of a known category are input during model training; category mapping of samples of a training set serves as a condition for guidance; the network is subjected to back propagation of optimization parameters through five loss functions of reconstruction loss, generation loss, discrimination loss, divergence loss and classification loss; pseudo-samples of a corresponding unknown category are generated through guidance of category mapping of the unknown category; and a pseudo-sample training classifier is used for testing on the samples of the unknown category. The high-quality samples beneficial to image classification are generated through theguidance of the category mapping, so that the problem of lack of the training samples of the unknown category in a zero sample scene is solved; and zero sample learning is converted into supervised learning in traditional machine learning, so that the classification accuracy of traditional zero sample learning is improved, the classification accuracy is obviously improved in generalized zero sample learning, and an idea for efficiently generating the samples to improve the classification accuracy is provided for the zero sample learning.

The invention provides a wind turbine generator control method, a controller and a control system of wind turbine generator. The method comprises the steps of acquiring the air velocity in front a hub by a distance two to three times the diameter of an impeller, the pitch angle of the impeller at the current moment as well as the rotation angular speed of the generator, calculating the pneumatic torque of the impeller, and calculating corresponding electromagnetic torque; acquiring the current torque given value and a pitch angle given value; and correcting the given value outputted by a torque controller or a variable-pitch controller. The controller comprises a pneumatic torque calculation module, a torque controller, a variable-pitch controller and a controller given value correcting module. The control system comprises a laser radar wind speed measurement instrument, a wind turbine generator, and the above controller. The wind turbine generator control system provided by the invention can respond to the wind speed change in advance to correct the variable-pitch and torque control effect so as to improve the wind energy utilization rate of the wind turbine generator, thereby obviating integral fatigue loads and power generation loss caused by impeller inertia and delay of the pitch-variable system.

The invention discloses a data evaluation method and device. The method comprises steps that a data grade evaluation request of a target object is received; risk evaluation for the data grade evaluation request is carried out according to a pre-stored data grade model to acquire risk probability and a default generation loss rate corresponding to the target object; evaluation is carried out according to the risk probability and the default generation loss rate to acquire a data grade corresponding to the target object. The method is advantaged in that a technical problem of low data estimation precision caused by defects of user loan quota estimation based on experience and subjective expert determination in the prior art is solved.

The invention discloses a dust-accumulation power-generation-amount loss prediction-based auxiliary decision-making method of photovoltaic-plant cleaning time. The method comprises the following steps: 1) predicting a number N of days before a precipitation day with a significant cleaning effect; 2) estimating a dust-accumulation loss rate, in a case where a photovoltaic plant is not cleaned in the N days, and a dust-accumulation loss rate of the photovoltaic plant in the N days after cleaning of the next day; and 3) respectively calculating profit before and after cleaning according to estimation results, carrying out cleaning if the profit is greater than a cleaning cost, and not carrying out cleaning if the profit after cleaning is less than the cleaning cost. According to the method, aprediction method is applied to dust-accumulation power-generation-amount loss estimation of the photovoltaic plant, thus comparative analysis of whether cleaning economy exists is carried out, a technical method and an economic analysis method are fused, result accuracy thereof is higher, and economic benefits of the photovoltaic plant can be effectively increased.

The invention discloses a wind generating set blade fault diagnosis method and device. The method comprises the steps of: collecting noise signals of each blade of a wind generating set; obtaining frequency spectrum characteristics of the noise signals of each blade; and judging whether there is a faulted blade according to the frequency spectrum characteristics of the noise signals of each blade. According to the technical scheme of the invention, on the premise that the normal operation of the wind generating set is not influenced, the blade states are monitored by collecting, processing and analyzing the noise signals of each blade of the wind generating set, various kinds of abnormal states or fault states of the blades can be accurately diagnosed in time, and corresponding solutions can further be made according to the diagnosed faults, so that the unnecessary losses caused by accidents and the power generation loss caused by shutdown maintenance and overhaul are lowered, the maintenance cost of the blades is reduced, and the integral reliability, the stability and the integral benefit of the wind generating set are improved.

The performance of a power transducer is improved while efficiently using a power semiconductor also by managing the permissible duty factor of the power semiconductor in the regenerative braking circuit provided in the power transducer. The user is allowed to set, through an operation panel provided on the power transducer, the resistance value of the regenerative braking resistor for thermally consuming the rotational energy generated during motor deceleration. The power transducer performs the steps of: calculating the current which flows in the regenerative braking circuit from the resistance value setting; obtaining the generation loss of the power semiconductor in the regenerative braking circuit with the calculated current value; and determining the permissible duty factor of the power semiconductor from the obtained generation loss.

The invention relates to an eddy generator for a wind turbine blade. The eddy generator comprises multiple fins, and each fin is a triangular plate part with a circular corner as a top corner. According to the eddy generator, stalling can be effectively delayed, the pneumatic performance of the blade is improved, the situation can be reduced that the power generation loss of a wind turbine is caused by blade surface pollution, and the eddy generator can be applied to power increase transformation of the wind turbine blade which is operated. The invention further relates to a method for determining the mounting position of the eddy generator on the wind turbine blade and a method for installing the eddy generator on the wind turbine blade. According to the methods, the mounting and positioning process is precise and reliable, and the mounting efficiency is high.

An object of the invention is to provide a fuel reformer housing container and a fuel reforming apparatus, which are capable of maintaining a level of vacuum inside the fuel reformer housing container favorably and which have less power generation loss. A fuel reformer housing container (11) includes a base (1) having a concave portion for housing a fuel reformer (9) in which reformed gas containing hydrogen gas is generated from fuel, a discharge pipe (5b) for communicating inside of the concave portion with outside thereof to discharge the reformed gas from the fuel reformer, a supply pipe (5a) for communicating inside of the concave portion with outside thereof to supply the fuel to the fuel reformer (9), and a gas adsorbent (10) housed in the concave portion, for adsorbing gas in the concave portion.

The invention discloses a wind power plant generating capacity loss measuring method and system based on draught fan SCADA data. The method comprises the steps that the draught fan SCADA data and on-site anemometer tower data are obtained; screening processing is conducted on the draught fan SCADA data and the field anemometer tower data, abnormal record values and shutdown time in the draught fanSCADA data are screened, and a complete data set is established; Establishing a fan performance evaluation index according to the data set; and calculating to obtain the power generation loss of thewind power plant through the fan performance evaluation index. According to the invention, a neural network technology and a random process theory are combined; SCADA data of the draught fan are analyzed, a draught fan operation behavior model is established, indexes for evaluating the draught fan operation performance are provided. The power generation amount loss of the draught fan is obtained through calculation, and the draught fan operation and maintenance efficiency is improved and the maintenance cost is reduced through a data-driven draught fan performance evaluation method.

A three level power converter in which each phase comprises one unit having four switching elements (1u-4u) and two diodes (9u,10u) that are arranged along the flowing direction of cooling air with their long sides directed perpendicularly to the flowing direction of cooling air on the heat receiving section (15) of a cooler. First and second diodes (9u, 10u) are arranged in the center of the heat receiving section (15) whereas second and third switching elements (2u, 3u) having high heat generation loss are distributed while holding the central diode group between them, thus leveling temperature rise of respective switching elements.

The invention discloses a large-sized wind generating set peak adjusting and controlling method with the minimum clearance being increased. According to the large-sized wind generating set peak adjusting and controlling method with the minimum clearance being increased, power peak adjusting is added based on a traditional control strategy and pitch starts changing in advance, the thrust is reduced, and the minimum clearance is increased when the power achieves a certain limiting value. The large-sized wind generating set peak adjusting and controlling method with the minimum clearance being increased has the advantages of being simple and efficient in control, obvious in minimum clearance increasing effect and small in power generation loss; increasing the minimum clearance and meanwhile reducing set over-speed halt caused by gust of wind at the rated wind speed; being benefited to reduce manufacturing costs of the large-sized wind generating set and improving competitiveness; increasing the minimum clearance, reducing load, shortening the design period and reducing costs of per kilowatt on the basis that geometric designs of critical components do not modified although partial electric power is lost.

The invention provides a method and system for offshore wind power operation and maintenance decision simulation, and the method comprises the steps: A, building a bottom-layer fault database which stores fan set fault statistical data, wherein the fault data information stored in the bottom-layer database is divided according to grades; b, according to the information of the wind power plant and the bottom layer fault database, discretizing and randomizing the fault data information at each time point according to the occurrence probability and frequency of the fault data information; and C, performing combined operation and maintenance simulation on each fault according to a time sequence under the condition of conforming to the sea-going limitation, and obtaining an optimal logic strategy of combined operation and maintenance by taking the comprehensive optimization of the operation and maintenance cost and the power generation loss condition as a principle. According to the invention, the method is beneficial to the obtaining of an optimized guidance planning scheme for offshore wind power offshore operation and maintenance.

A concealing method of package loss includes five steps. Firstly, for good voice frames, the result of voice decoding is saved; secondly, for a first lost frame, the Pitch is detected in the saved voice data; thirdly, multiple suitable Pitch cycles are selected to construct the lost voice segment L; fourthly, a suitable voice data section and a tail data section in the lost voice segment L are selected to be smoothly processed, and the tail data in the lost voice segment L is replaced; finally, by utilizing the lost voice segment L, a composite PLC frame U corresponding to the first lost frame is generated. Compared with the method recommended by the ITU-T Recommendation G.711-Appendix I, the concealing method has the advantages of simple realization, small amount of computing, no destruction of Pitch cycles and avoidance of phenomena, such as BEEP, converse order, etc. By applying the present invention, the normal calls of a VoIP system can tolerate package loss rate over ten percent. The method disclosed by the present invention not only can be used in a VoIP system but also can be used in other voice-related systems or systems needing to generate lost voice.

The embodiment of the invention provides a control system for a multi-module photovoltaic grid-connected inverter. The inverter comprises a plurality of inverter modules. The control system comprises a plurality of first control modules and a second control module, wherein the plurality of first control modules are respectively connected with the plurality of inverter modules and used for acquiring module operation data of each inverter module as well as transmitting the module operation data to the second control module through a communication bus; the second control module is connected with the plurality of first control modules through communication buses and used for sending an inverter control instruction to the plurality of first control modules as well as acquiring the module operation data of the inverter modules, acquired by the plurality of first control modules. With the adoption of the system, the demand on hardware resource of a controller can be reduced; in addition, the hardware structure of the controller is simplified, and meanwhile, the generation loss caused by fault can be reduced.

The invention discloses a power generation predictive control method for a photovoltaic power station. The method comprises the following steps of: firstly, acquiring weather forecast data in a future time period; and secondly, combining the weather forecast data, current longitude and latitude data, the installed capacity of the photovoltaic power station and historical power generation data of the photovoltaic power station, and thus obtaining the power generation total quantity of the photovoltaic power station in the future time period. Therefore, the power generation quantity situation of some day can be judged, corresponding plan information and early warning information can be output by software, and power generation loss and equipment damage caused by weather change are avoided.

The present invention discloses a three-body photovoltaic power generation direct-current optimizer with direct-through devices. The three-body photovoltaic power generation direct-current optimizer comprises a monitoring circuit module and a power conversion circuit module. The three-body photovoltaic power generation direct-current optimizer can be connected with three photovoltaic panels and maintain the maximum power point tracking (MPPT) function, data acquisition, data transmission and protection shutdown of each three photovoltaic panel; three paths of input are adopted, wherein two paths of input share a power inductor and an output capacitor, and the three paths of input share one bypass circuit, one current sampling circuit, one MCU, one communication circuit and one auxiliary power supply circuit, and therefore, product cost reduction can be achieved; and the two direct-through circuit devices are adopted, and the direct-through circuit devices can be turned on automatically when a fault occurs on the control system of the optimizer, and therefore, the three photovoltaic assemblies can be directly connected into the system, so that the system can continue to work, power generation losses can be reduced, and the reliability of a power generation system can be improved.

The invention provides a wind driven generator blade ice removing method, an ice removing system and terminal equipment. The ice removing method comprises the steps of obtaining the temperature and the humidity of the external environment of a wind driven generator and a 380V bus three-phase current effective value in a hub; and judging whether to start ice removing or not according to the temperature and humidity values of the external environment, the change tendency of the temperature and the condition if the 380V bus three-phase current effective value exceeds 80% of a bus cable rated current effective value. According to the temperature values of the external environment and in blades, the three-phase current effective value of the ice removing system is set, and the ice removing system is controlled to work in different power states to achieve the best ice preventing and removing effect with the lowest power consumption. The ice removing system comprises an ice removing main controller, an ice removing slave controller, an ice removing heater and other components. The labor amount of cable arrangement and slide ring replacement and the use cost are effectively reduced; and when the reliable operation of a wind turbine generator system is guaranteed, the power generation loss caused by blade icing is reduced, and the enterprise production and management efficiency is improved.

The invention discloses a transmission control mechanism for a photovoltaic tracker, the photovoltaic tracker and a transmission control method. According to the transmission control mechanism, two motors are simultaneously connected to a speed reducer, and only one motor is allowed to be in working state; a central control unit is used for monitoring the working states of the two motors; and when failure is monitored in work of a first motor, a first switch and a second switch for controlling the first motor and a second motor are switched so as to turn off the first motor and turn on the second motor. Extremely tiny cost of the entire system is increased, the second motor is used as a standby motor, and the transmission control mechanism is quickly switched to the standby motor to work when the first motor used as the working motor fails, so that the long-term reliable operation of the system is guaranteed, the reliability of the photovoltaic tracker is improved, the power generation loss is avoided, and the maintenance cost and the loss caused by stop of power generation due to maintenance are reduced.

The invention discloses a hydraulic optimization design method of an annular water-compressing chamber of a nuclear power pump based on entropy generation analysis. The hydraulic optimization design method comprises the following steps: selecting design parameters of the annular water-compressing chamber for nuclear power according to impeller parameters and performance requirements, and carrying out initial calculation on a design range of design parameters of the water-compressing chamber; carrying out multi-scheme design on the annular water-compressing chamber by adopting a testing design method; carrying out three-dimensional modeling, mesh dividing and numerical simulation; applying the entropy generation analysis to obtain entropy generation loss of the annular water-compressing chamber; and establishing a function relation between the design parameters and the entropy generation loss by adopting an approximate model and solving the function by applying an optimization algorithm to minimize the entropy generation loss, so as to obtain optimal design parameters of the annular water-compressing chamber. With the adoption of the hydraulic optimization design method, the hydraulic efficiency of the annular water-compressing chamber is effectively improved; and the sphere-like water-compressing chamber is adopted and safe operation is guaranteed.

The invention provides an apparatus for bi-directional power conversion between a DC circuit and an AC circuit, which inexpensively and simply suppresses generation losses of elements and reduces heat generation, wherein a voltage obtained by dividing the U-phase voltage Vu is compared with a voltage obtained by dividing the voltage vpn of a DC circuit by a comparator CP1, and the MOSFET UFETh is turned on at the output timing thereof, and a voltage obtained by dividing the V-phase voltage Vv is compared with a voltage obtained by dividing the voltage Vpn of a DC circuit by a comparator CP2, and the MOSFET UFETh is turned off at the output timing thereof.

The invention discloses a flexible active power control system for a photovoltaic power station and a feeder removal algorithm method for the flexible active power control system. The system comprises a flexible active power control device, a remote function module, a scheduling data network and an AGC (automatic generation control) system in the photovoltaic power station, wherein the remote function module, the scheduling data network and the AGC system communicates with the flexible active power control device. The method comprises the following steps: a communication module of the flexible active power control device communicates with the remote function module, the scheduling data network and the AGC system in the photovoltaic power station to acquire data of the photovoltaic power station, receive a planned generation active power value, transmitted by scheduling, of the photovoltaic power station and simultaneously forward the planned value to the AGC system. By a feeder selection algorithm, a high-quality generation resource can be maximally reserved, generation loss can be reduced, more benefits are created for an owner of the power station, and contributions are made to the environmental protection business.

The invention provides a solar power station environment detection system, which comprises an environment detection module, a control unit, an early warning module, a cleaning module and a wireless communication module, wherein the environment detection module detects the environment of a solar power station and obtains environment detection data; the environment detection data is transmitted to the control unit through the wireless communication module; the control unit stores and analyzes the environment detection data and controls the cleaning module; the early warning module sets an environment early warning value, judges whether the environment detection data reaches the environment early warning value or not, if so, sends a cleaning instruction to the cleaning module, and does not send a cleaning instruction to the cleaning module if the environment detection data does not reach the environment early warning value; and the cleaning module cleans the solar power station. The solarpower station environment detection system improves the power generation efficiency of the solar power station, and reduces the power generation loss caused by dust, illumination and rainwater for asolar panel; and automatic cleaning for the solar panel is realized through the cleaning module, the power generation efficiency is improved, and the labor cost is greatly saved.