Voltage-variable photovoltaic system maximal power tracing control method adapting to weather status

Abstract

The invention provides a maximum power tracking control method of a voltage variable photovoltaic system which adapts to weather conditions, belonging to the photovoltaic power generation technical field; firstly, three data of voltage, current outputted by a photovoltaic battery and temperature of a photovoltaic battery plate at a moment are collected by a collection circuit, and an open circuit voltage value and an illuminating value at the moment are worked out based on the collected data; secondly, an approximate optimum output voltage value is obtained by a real optimized voltage coefficient multiplying the open circuit voltage value, and the temperature and the illumination are compensated, which obtain a real optimum output voltage value, and further a real optimum output current value is obtained; thirdly, an output value of a load end is compared with the real optimum output voltage value and the real optimum output current value, and a maximum power output is realized based on the proportional plus integral control on a fluctuating chopper circuit and a double closed loop of the voltage and the current. The maximum power tracking control method of the voltage variable photovoltaic system improves the output power of a photovoltaic power generation system and simultaneously ensures the operational stability and reliability of the system.

Description

technical field [0001] The invention relates to a control method in the field of optoelectronic technology, in particular to a maximum power tracking control method for variable voltage photovoltaic systems adapted to weather conditions. Background technique [0002] The utilization and research of various renewable energies has been paid more and more attention by major developed countries in the world, and has become one of the effective means to solve energy crisis and environmental problems. Photovoltaic power generation system can convert the huge energy of solar energy into electrical energy, which is one of the important ways to generate electricity in the future. However, photovoltaic power generation systems have a series of problems such as high investment costs, low efficiency, and unstable output power. Therefore, it is very necessary to study an efficient maximum power tracking control method for photovoltaic power generation systems. The maximum power tracking...

AI Technical Summary

Problems solved by technology

Although the problem has been solved to a certain extent, there are deficiencies such as poor accuracy, poor adaptability and low tracking efficiency.

[0003] After searching the literature of the prior art, it was found that A. Saadi et al. published in "IEEE ISIE 2006" (Proceedings of the International Conference on Industrial Electronics of the Institute of Electrical and Electronics Engineers of America) (July 9-12, 2006, pages 1716-1720) Published "Optimization of chopping ratio of back-boost converter by MPPT technique with a variable reference voltage applied to the photovoltaic water pumping system" application in the system), the concept of variable voltage tracking is proposed in this paper, but how to realize it is not mentioned

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