Method for tracing maximum power point of solar photovoltaic battery

Abstract

The present invention discloses a tracing method of maximum power points of solar photovoltaic cells and belongs to the solar photovoltaic cell field. The steps of the present invention includes: (1) given voltages of solar photovoltaic cell under different intensities of sunlight are calculated and stored in a control chip; (2) the value of intensity of sunlight is read, and the given voltage of the solar photovoltaic cell under the intensity of sunlight is read according to the value of the intensity of sunlight; (3) an actual output voltage of the solar photovoltaic cell is read; a difference value between the value and the given voltage in th estp (2) is regulated with a PI regulating method; a PMW pulse is obtained by comparing the regulating result and triangular waves to drive power devices and regulate the load impedance of the solar photovoltaic cell. The control algorithm of the present invention is very simple and reliable by tracing the maximum power point of solar photovoltaic cells with a rectilinear of a specific slope, and the present invention has a strong anti-interference ability, simplifies the hardware structure of the control, reduces the cost, improves the control precision of the system effectively and improves conversion efficiency of photovoltaic generation systems.

Description

technical field [0001] The invention belongs to the field of solar photovoltaic cells, in particular to a method for tracking the maximum power point of a solar photovoltaic cell. Background technique [0002] As a non-polluting, renewable new energy source, solar energy has very broad development prospects and has been widely used at home and abroad. [0003] my country is a country rich in solar energy resources. In coastal islands, remote mountainous areas with inconvenient transportation, grasslands and pastures with vast land and sparsely populated areas, as well as rural areas, frontiers and minority areas that are far away from the power grid and difficult to reach the power grid in the near future, solar power generation has become a solution. A reliable way to produce and live energy can achieve good economic and social benefits. According to statistics, the potential solar energy resources in the world reach 120,000Tw, and 600Tw can actually be exploited. This is t...

AI Technical Summary

Problems solved by technology

[0008] The perturbation and observation method has an accurate algorithm and high control precision. At the same time, it may also only track the "local optimum", and the corresponding hardware structure is complex, the manufacturing cost is high, and the reliability is poor.

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