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

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.)...

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

Images