Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Maximum power point tracking method based on efficient adaptive perturbation and observation

A technology of maximum power tracking and disturbance observation method, which is applied in photovoltaic power generation, instruments, regulating electrical variables, etc. It can solve the problem of difficulty in weighing the step size, and achieve the effect of fully adaptive disturbance, easy implementation and high steady-state accuracy.

Active Publication Date: 2012-12-05
SOUTHEAST UNIV
View PDF5 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The purpose of this invention is to propose a maximum power tracking method based on the efficient adaptive perturbation and observation method for photovoltaic arrays, which solves the problem that the step size of the traditional perturbation and observation method is difficult to trade off, and can realize fully adaptive perturbation and fast tracking speed , High steady-state precision, strong system versatility

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Maximum power point tracking method based on efficient adaptive perturbation and observation
  • Maximum power point tracking method based on efficient adaptive perturbation and observation
  • Maximum power point tracking method based on efficient adaptive perturbation and observation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The specific implementation steps of the maximum power tracking method of the efficient adaptive disturbance observation method of the present invention are as follows:

[0024] 1. First measure the output voltage U of the photovoltaic array pv (n) and output current I pv (n), the n in the symbol represents the nth sampling result.

[0025] 2. Then the output power P of the photovoltaic array is calculated through the voltage and current signals filtered by a low-pass filter pv (n)=U pv (n)×I pv (n), calculate the adaptive disturbance value according to the change between the power signals. Use this change as the error signal of the closed-loop control system to control the error as small as possible in the steady state, while avoiding the overshoot when the system is started, and eliminating the power oscillation in the steady state.

[0026] A PI controller a is used to achieve the above control. The PI controller a is used as an adaptive disturbance value generator required...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a maximum power point tracking method based on efficient adaptive perturbation and observation. By the aid of the maximum power point tracking method, the problem that the step size used in a traditional perturbation and observation method in the photovoltaic-battery maximum power point tracking technology is difficult to balance, completely adaptive perturbation can be realized, and tracking speed, stability precision and universality of a system are high. The maximum power point tracking method with a basic principle includes that computing continuous output power values of a photovoltaic array according to filtered voltage and current signals; generating error signals according to changes among power signals; generating adaptive perturbation voltage values via a PI (proportional plus integral) controller; and finally generating a reference value of voltage of the photovoltaic array according to the basic principle of perturbation and observation. An error signal of an actual value and the reference value of the voltage of the photovoltaic signal is computed, and a duty cycle signal d required by a DC / DC converter is generated by another PI controller, so that on and off time of each power switch tube of a phase-shift full-bridge converter is controlled, power outputted by the photovoltaic array is adjusted, and the maximum power output point of the photovoltaic array can be tracked.

Description

Technical field [0001] The invention relates to a maximum power tracking technology for photovoltaic arrays (cells). The invention relates to a grid-connected or off-grid photovoltaic power generation system. The design of the present invention belongs to the technical field of maximum power tracking. Background technique [0002] In today's world, problems such as the shortage of conventional energy and the deterioration of the ecological environment have become increasingly severe. As a kind of clean and renewable energy, photovoltaic power generation has obtained unprecedented development opportunities and strong development momentum in the world for solving energy problems and realizing sustainable development of human society. However, the photoelectric conversion efficiency of photovoltaic cells is very limited, and it is an extremely unstable power source. The output power is easily affected by the external environment (such as light intensity, ambient temperature, etc.)...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 赵剑锋王书征姚晓君施超
Owner SOUTHEAST UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com