Tracking system and method for sun tracker

A solar tracker and tracking system technology, applied in the field of solar trackers, can solve problems such as poor accuracy, poor robustness, and slow tracking speed, and achieve the effects of improving control accuracy and speed, and improving slow convergence speed.

Active Publication Date: 2017-06-27
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of slow tracking speed, poor accuracy and poor robustness of the control algorithm of the sun tracker in the prior art. When the vehicle bumps or has

Method used

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  • Tracking system and method for sun tracker
  • Tracking system and method for sun tracker
  • Tracking system and method for sun tracker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Such as figure 1 , figure 2 As shown, the tracking system for a sun tracker includes a GA sample data preprocessing module, a BP network adjustment module, a PID controller module, and a feedback system module.

[0051] The GA sample data preprocessing module performs individual optimization according to the sample data, obtains the individual with the greatest fitness and passes it to the BP network adjustment module as the optimal initial value for training;

[0052] On the basis of the optimal initial value, through the reverse transmission of the BP network adjustment module, the weights and thresholds of the hidden layer and the output layer are adjusted, so that the obtained error evaluation function is smaller than the set error threshold, and the adjusted P, I, D parameters;

[0053] The BP network adjustment module transmits the adjusted parameters of P, I, and D to the PID controller module, and the PID controller module controls according to the two degree...

Embodiment 2

[0069] Such as Figure 4 , Figure 5 As shown, the tracking method for a sun tracker is applied to the tracking system provided in Embodiment 1. The algorithm first adjusts the PID parameters with the best tracking performance as the control target, and then adjusts the parameters with the best anti-interference performance as the control target. The specific adjustment steps are as follows:

[0070] Step 1. Randomly generate 2000 sets of data, of which 1500 sets of data are used to train the BP network, and the other 500 sets of data are used to test the BP network, and normalize the data;

[0071] Step 2. Determine the BP network structure

[0072] First of all, it is determined that the network has three layers in total: input layer, hidden layer, and output layer; among them, there are 4 neurons in the input layer for the specified input signal r in (k), the actual output signal y out (k), the error amount e(k) and the constant a; the three neurons in the output layer ...

Embodiment 3

[0094] This embodiment will introduce the evolution process from the prior art to the algorithm provided in Embodiment 2.

[0095] two degrees of freedom

[0096] The control indicators of the PID control system mainly include: external disturbance suppression and target tracking characteristics. When the one-degree-of-freedom control is used, the two show opposite trends, and achieve the optimal performance at the same time. Two-degree-of-freedom PID (Two degree of freedom PID, 2DOF PID) control is to make the target tracking characteristics optimal and the external disturbance suppression characteristics optimal PID parameters to be adjusted separately, so that the performance of the entire control system can be optimal.

[0097] When using 2DOF PID control, it is necessary to meet the requirements of easy understanding, simple structure, good combination with traditional technology and the ability to inherit its technical achievements. In the control loop for the sun track...

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Abstract

The invention provides a tracking system and method for a sun tracker. The method comprises the following steps: firstly, performing the individual optimization according to sample data through a GA sample data preprocessing module to obtain the individual with the greatest adaptability and sending the individual to a BP network adjustment module as the optimal initial value for training; based on the optimal initial value and through the reverse transmission of the BP network adjustment module, adjusting the weights and thresholds of the hidden layer and the output layer to enable the obtained error evaluation function to be smaller than the set error threshold to obtain adjusted P, I, D parameters; and the BP network adjustment module sending the adjusted P, I, D parameters to a PID controller module, the PID controller module performing control according to two degrees of freedom, so as to enable the track performance and the anti-jamming performance to achieve the best respectively. The method combines the genetic algorithm with the neural network to make full use of the advantages of the two, so that the control system has the learning function, the robustness and the generalization ability of the neural network, and the global search optimization ability of the genetic algorithm.

Description

technical field [0001] The invention relates to the technical field of sun trackers, in particular to a tracking system and a tracking method for the sun tracker. Background technique [0002] In order to accurately track the sun, solar trackers for solar power generation and mobile vehicular measurements of solar-occulation flux (SOF) telemetry technology came into being. The sun tracker used for solar power generation is fixed-point monitoring. At present, the dual-axis sun tracker is mostly used. According to the longitude and latitude information, the real-time azimuth and altitude angle of the sun can be calculated, and the output is used to make control signals to adjust the pitch axis and azimuth axis. state to achieve sun tracking. The solar tracker used for vehicle-mounted SOF currently uses PSD as a feedback element, and the position of the light spot on the PSD is used as a feedback signal to adjust the position of the main reflector, so that the spectrometer at ...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李相贤韩昕高闽光童晶晶王亚萍陈军石建国李胜李妍
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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