Optimizing method and tracking device for output power of partially shielded photovoltaic power generation system

Abstract

The invention discloses an optimizing method and a system device for output power of a partially shielded photovoltaic power generation system. The system device comprises a photovoltaic battery plate, voltage and current acquisition circuits of the photovoltaic battery plate and a DSP (Digital Signal Processor) controller, wherein the controller is embedded with an APSOMPPT maximal power point tracking control algorithm program; the control output end of the controller is used for controlling a BOOST circuit through a PWM (Pulse Width Modulation) drive circuit; and the output of the BOOST circuit is connected with load. A tracking method comprises the steps as follows: fistly, obtaining open-circuit voltage of the photovoltaic battery plate; secondly, determining maximal output voltage of the photovoltaic battery plate according to the open-circuit voltage; thirdly, initializing a system and starting a timer; fourthly, when the set time is up, running the APSOMPPT maximal power point tracking control algorithm subprogram to iterate for multiple times; and lastly, taking global optimum of all the particles in the iterating process as voltage of a photovoltaic array for acting on the photovoltaic array. Therefore, the power optimization output of the photovoltaic power generation system is realized.

Description

technical field [0001] The invention belongs to the technical field of power electronics and automatic control, and in particular relates to a method for optimizing the power of a photovoltaic power generation system in which a solar photovoltaic power generation system works under a partially shaded condition and a system device for realizing the method. Background technique [0002] Solar photovoltaic power generation is an important part of new and renewable energy. However, due to the high cost of photovoltaic cells and the complex characteristics of photovoltaic systems, their conversion efficiency is very low, which has restricted the efficient use of solar energy. Therefore, how to further improve the conversion efficiency of solar cells and make full use of the energy converted by photovoltaic arrays is the main direction and key technology of photovoltaic power generation systems. [0003] The maximum power point tracking (Maximum Power Point Tracking, MPPT) of pho...

AI Technical Summary

Problems solved by technology

However, in practical applications, the array mismatch phenomenon and hot spot phenomenon caused by shading seriously affect the power output of the photovoltaic system, resulting in a significant drop in the power generation efficiency of solar panels.

Experimental data shows that as long as 10% of the solar panel array area is shaded, the entire photovoltaic power generation system will lose as much as 50% of its power generation

And under partial shadow conditions, there are multiple extreme points in the P-V characteristics of the photovoltaic array, which makes the conventional maximum power tracking algorithm invalid in this case

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