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254results about How to "Improve tracking accuracy" patented technology

Sun orientation automatic tracking method and device used for photovoltaic power generation

ActiveCN101662241AGuaranteed uptimeAddressing the impact of tracking stabilityAngle measurementPV power plantsFour quadrantsSignal processing circuits
The invention relates to a sun orientation automatic tracking method and a device used for photovoltaic power generation. The detection precision of the existing method and the device is lower. The method is a 24-hour 2D sun orientation automatic tracking method which uses a light intensity sensor to combine photoelectric tracking and sun motion trail tracking. The light intensity sensor detects climate and respectively adopts three different working modes to track the sun orientation in sunny days, cloudy days and rainy days, which solves the influences of climate changes and environment interference on the tracking stability to a certain extent, and simultaneously eliminates the accumulated errors through the closed loop control function of the photoelectric tracking mode, thus being capable of stably implementing sun orientation tracking in 24 hours. The device for realizing the method includes a wave-pass drum, the light intensity sensor, protective glass, a four-quadrant photoelectric detector, a signal processing circuit, a computer and an external clock chip. The invention improves the detection precision and solves the problem of unstable detection signal caused as the sunorientation detector is easy to be interfered by environmental light.
Owner:JIANGSU HUAAN SCI RES DEVICES

Visual sense tracking method based on target characteristic and bayesian filtering

The invention discloses a visual tracking method based on target characteristics and bayes filtration. The method comprises the following steps: a system model and an observation model are established according to the actual motion of a target; the color and the gradient of the target are calculated, similarity function is constructed, and the current observed value of the target is obtained by a particle filter; the state average of particulate matter and the covariance are processed by using karman filtration, thus generating new gauss distribution, then new particulate matter is sampled according the gauss distribution generated, thus calculating weight and output; finally, the particulate matter is sampled again; meanwhile, a partition detection method for the target and the corresponding processing algorithm of shading and non shading are proposed; the visual tracking process is finished. Compared with similar algorithm, the method realizes information complementation between the characteristics by the blending of multi-information, therefore, the target is not easy to be affected by external environmental factors such as light, etc. By adopting the combination of particle filtration and the karman filtration, the tracking accuracy of the whole method is higher, thus improving the tracking performance and being adapted to various complicated environments.
Owner:ZHEJIANG UNIV

Sliding-mode variable structure control method of single phase grid-connected inverter based on multi-resonant sliding mode surface

The invention discloses a sliding-mode variable structure control method of a single phase grid-connected inverter based on a multi-resonant sliding mode surface. The method comprises the steps of: firstly, building a linear sliding mode surface according to detected current i1 of an inverter side filter inductor of the single phase grid-connected inverter, the voltage vc of a filter capacitor, the current i2 of a network side filter inductor, and the target output current i1* of a grid-connected inverter system, the target voltage vC* of the filter capacitor and the grid-connected target current i2*; adding a resonant item into the linear sliding mode surface so as to obtain the multi-resonant sliding mode surface; designing a sliding-mode variable structure controller by the multi-resonant sliding mode surface, leading a linear state feedback controller to an original nonlinear controller to obtain a final control quantity modulation wave d(s), and finally comparing the modulation wave with a carrier wave to generate a driving signal for driving a switch tube to act. According to the control method disclosed by the invention, the robustness and dynamic response ability of the grid-connected inverter system are improved; the tracking accuracy of grid-connected current is also improved; the harmonic content is removed, and the control method is simple and easy to achieve.
Owner:XI AN JIAOTONG UNIV

Automatic tracking type solar generator

InactiveCN101227158ALess power consumptionReduces power consumption and low cost compared to MCU trackersPhotovoltaic supportsMirrorsElectricitySolar generator
An automatic tracing type solar generator belongs to the technical field of solar electric power generation, which comprises a chassis, a supporting structure with a rotating shaft, a light concentrating thermal-collecting device, an accumulator, a driving device and an automatic tracing controlling device, wherein the supporting structure is connected on the chassis through a first driving device, the light concentrating heat-collecting device is mounted on the rotating shaft of the supporting structure and is connected with the supporting structure through a second driving device, the driving motor and the automatic tracing type controlling device of the two driving devices are electrically connected, and the light concentrating heat-collecting device is electrically connected with the accumulator. The invention has good property and long service life. The automatic tracing type lighting system combines input ends of four sensing devices to judge the position, which increases judging accuracy. The circuit is simple and reliable, power consumption is low, and cost is greatly reduced compared with a single-chip processer tracker. The invention effectively utilizes solar, which is nonpolluting, no discharging, saves energy and protects environment. A light collecting cover can automatically turnover upwards, has the function of snow resistance, rain resistance and automatic protection, and effectively protects the damage of a motor.
Owner:北京格物创道科技发明有限公司

Solar tracking and driving control system

InactiveCN102063128ARealize fine trackingFast response to trackingPhotovoltaic supportsControl using feedbackControl systemComputer module
The invention relates to a solar tracking and driving control system comprising a receiver, a protection plate, at least three thermocouple temperature sensors, a central control unit, an elevating-angle angular sensor, an azimuth-angle angular sensor, an azimuth-angle driving mechanism, an elevating-angle driving mechanism, a GPS (Global Positioning System) module, a power supply, an azimuth-angle worm and gear transmission mechanism and an elevating-angle worm and gear transmission mechanism. The azimuth-angle driving mechanism drives the azimuth-angle worm and gear transmission mechanism, the elevating-angle driving mechanism drives the elevating-angle worm and gear transmission mechanism; the azimuth-angle driving mechanism is provided with at least two first motors; the azimuth-angle driving mechanism is provided with at least two second motors; the thermocouple temperature sensors are distributed on the protection plate, circularly distributed in at least one circle centering about a receiving hole of the receiver, and each circle is provided with at least three thermocouple temperature sensors. The invention has the advantages of high tracing reaction speed, high tracking accuracy, low cost, stable driving part operation, strong anti-impact capability, great transmission torque and long service life.
Owner:HOHAI UNIV CHANGZHOU

Automatic focus tracking type solar concentrating photovoltaic power generation system

The invention discloses an automatic focus tracking type solar concentrating photovoltaic power generation system, and belongs to the field of concentrating photovoltaics (CPV). The problems of accuracy, cooling and weather resistance bottlenecks of the conventional CPV are mainly solved, and power generation cost is lowered. The system consists of five systems: (A), for concentrating power generation, condensing mirrors are fixed, and solar cells are driven by a stepper motor to track sunlight converging focuses; (B), for control tracking, computer time is corrected by a timing system, the position of a sunlight converging focus at another coming moment is calculated according to the original positions, module parameters, directions and positions of two sunlight converging focuses, which are manually measured at a certain time interval, and an instruction is transmitted to the stepper motor to drive the solar cells to move to the position at the moment; (C), for cooling and heat production, the solar cells are directly impregnated by a circulating liquid heat conducting medium; (D), for charging and discharging inversion, running power is stored at first, and redundant power is transmitted to a power grid; and (E), for automatic cleaning, an automatic spraying and rain wiping mode is adopted.
Owner:尤长鹏 +1

Pseudo-measurement-based asynchronous track fusion algorithm with feedback maneuvering target

The invention discloses a pseudo-measurement-based asynchronous track fusion algorithm with a feedback maneuvering target. Firstly, input interaction is carried out on a model set, and the filtering initial value of each model is calculated according to the model probability and the model transfer probability; secondly, a fusion center calculates one-step prediction values on the basis of the Kalman filtering algorithm, after new sensor measurement information in the filtering period is obtained, the one-step prediction values are distributed in a time shaft sequence, recurrence is conducted on a fusion moment, information such as sensor observation matrixes, noise and model prediction are added, and asynchronous track fusion is conducted; thirdly, secondary filtering is carried out for calculating model output, output interaction is performed in the fusion center to obtain a fusion center estimated value and an estimation error matrix, and the fusion center estimated value and the estimation error matrix are fed back to a sensor according with feedback conditions. The overall precision of the algorithm is improved by introducing a fusion structure with feedback so that a better effect can be achieved in multi-sensor maneuvering target tracking.
Owner:CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST

TMX320F28335 floating point DSP (Digital Signal Processor) based two-shaft photoelectric tracking system

The invention provides a TMX320F28335 floating point DSP (Digital Signal Processor) based two-shaft photoelectric tracking system, belongs to the technical field of control of servo movement, and aims at solving the problems of low tracking precision and inconvenient mounting, dismounting and repairing due to the DSP based control for the two-shaft photoelectric tracking system in the prior art. The system comprises a detection device, a servo control module, an angle measuring loop module, a speed measuring loop module, a power amplification driving loop module, a communication loop module, an upper computer module and an image processing module; the angle position information and angle rate information measured by a photoelectric encoder and a gyro of the detection device are respectively sent to the servo control module through the angle measuring loop module and the speed measuring loop module; the image processing module is used for processing the acquired module to obtain the miss distance of a characteristics target; the servo control module is used for acquiring control quantity according to the angle position information, the angle rate information, the miss distance, an instruction of an upper computer and a set working mode and sending to the power amplification driving loop module to drive the detection device to track the characteristics target on real time. The system is applied to the field of military tracking.
Owner:HARBIN INST OF TECH

Neural network compensation control method for capturing maximum wind energy in wind power system

The invention relates to a neural network compensation control method for capturing maximum wind energy in a wind power system. The neural network compensation control method includes a, acquiring the speed of the wind, and acquiring a reference value of the speed of a wind turbine and a corresponding disturbance speed of the wind turbine according to the wind speed, a reference value of a tip speed ratio and a gear ratio of a gear box; b, acquiring a speed error according to the reference value of the speed of the wind turbine and a speed value of the wind turbine, adopting the PID closed-loop regulation on the reference value of the speed of the wind turbine and the speed error, and acquiring a reference value of the steady torque of the wind turbine; c, adopting the reference value of the steady torque of the wind turbine and the disturbance speed of the wind turbine as the input of the the BP neural network, adopting the PSO (particle swarm optimization)algorithm to train until a required torque control value of the wind turbine is outputted, and accordingly controlling the torque of the wind torque through the torque control value of the wind turbine. By the aid of the neural network compensation control method, effective control of the torque of the wind turbine is realized, cost is reduced, adapting range is wide, and the neural network compensation control method is safe and reliable.
Owner:JIANGSU UNIV OF SCI & TECH

Following system and following method based on UWB

The invention discloses a following system based on UWB, comprising the following parts: a first UWB transmitting and receiving module, disposed on a target object followed and provided with a UWB tag; a second UWB transmitting and receiving module and a third UWB transmitting and receiving module, horizontally arranged on the following object at intervals, wherein the UWB tag obtains the distances L2 and L3 from the first UWB transmitting and receiving module; a calculating unit, configured to obtain the distances L2 and L3 from the first UWB transmitting and receiving module according to theUWB tag, and calculate to obtain the distance and angle between the followed object and the first UWB transmitting and receiving module; and a control unit, configured to control the driving device disposed on the followed object so that the followed object faces the target object. The following system based on UWB realizes the measurement of the distance and angle of the target object through three UWB transmitting and receiving modules, has simple and efficient algorithm, reliable measurement and high following accuracy compared with the existing positioning following scheme (based on UWB,WiFi, Bluetooth, zigbee module, etc.), and in addition, reduces the cost and has good user experience.
Owner:黎国溥

Improved maximum power point tracking method for photovoltaic power generation system

The invention discloses an improved maximum power point tracking method for a photovoltaic power generation system. The improved maximum power point tracking method comprises a Boost circuit, a voltage and current sampling circuit, an IR2110 isolation driving circuit and a digital signal processor DSP, wherein the digital signal processor DSP is connected with the voltage and current sampling circuit and the IR2110 isolation driving circuit; the IR2110 isolation driving circuit is connected with a power switch tube Q of the Boost circuit; the digital signal processor DSP controls the duty cycle adjustment of the power switch tube according to voltage U (k) and current I (k) which are acquired in real time to enable the output of a photovoltaic cell to reach the maximum power point. According to the improved maximum power point tracking method, in the beginning, the constant voltage tracking (CVT) method is adopted to quickly track to be close to the maximum power point of the photovoltaic power generation system, and then the modified variable step-size incremental conductance method is switched to further track to the maximum power point, so that quick tracking and high-precision operation are realized, and shortcomings in conventional algorithms at present are overcome.
Owner:JIANGSU UNIV

16 quadrature amplitude modulation (QAM) demodulation synchronization method

The invention provides a 16 quadrature amplitude modulation (QAM) demodulation synchronization method. The method comprises a first step of adding a power detection technology on a traditional costas loop of quadrature phase shift keying (QPSK) so as to finish carrier recovery; a second step of performing matched filtering on each same-phase orthogonal component signal, so as to reduce noise effect and prepare for bit synchronization; a third step of performing bit timing recovery on same-phase orthogonal signals through an "early-late gate"; a fourth step of setting a threshold, and performing sampling judgment and 4-2 level conversion on each of two paths of signal to obtain parallel signals; and a fifth step of performing differential decoding and parallel-serial conversion on the parallel signals, then recovering and obtaining original signals. According to the introduced novel carrier synchronization technology, the carrier recovery is finished by using a phase-locked loop; on the basis of the traditional costas loop, the power detection technology is added, so that the linear output of a phase discriminator is guaranteed, the tracking precision and speed are improved, and the novel carrier synchronization technology passes field programmable gate array (FPGA) hardware verification.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Power supply modulator and power supply modulating method

The invention discloses a power supply modulator and a power supply modulating method, comprising isolating power supplies, amplitude generating circuits and a controller, wherein the number of the isolating power supplies and the amplitude generating circuits are respectively N (N is more than 1); each isolating power supply is connected with one corresponding amplitude generating circuit; the output ends of all the amplitude generating circuits are connected in series; the controller is respectively connected with the amplitude generating circuits, wherein the isolating power supplies output reference power supplying signals to the amplitude generating circuits; the controller receives the reference signals to be tracked, determines the amplitudes of electric signals output by all the amplitude generating circuits according to the amplitudes of the reference signals to be tracked, and sends control signals to all the amplitude generating circuits; and after receiving the control signals, the amplitude generating circuits adopt the reference power supplying signals to output the electric signals according to the control signals; and all the amplitude generating circuits output in series. The invention can realize the higher tracking accuracy of output signals by less input power supplies, and can simultaneously optimize the loss of devices.
Owner:ZTE CORP
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