A Global Linearization Model for Photovoltaic Systems
CHEN Jinbiao
LI Shaowu
LIU Xuwen
GUO Weihao
ZHANG Tingyi
Abstract：To solve the problem of nonlinear characteristics of the photovoltaic system and to design and optimize the control strategy of the photovoltaic system,a linear modeling method for the photovoltaic system was proposed.Firstly,according to the working mode and working state of each component in the photovoltaic system,the spatial state equation was established through the state space average method,and the linear state mathematical model of each component was derived.Secondly,the mathematical model of each component was combined to obtain the overall linear mathematical model of the photovoltaic system.Thirdly,the overall linearization model was reduced by the Routh approximation method,and a simplified overall linearization model of the photovoltaic system was obtained.Finally,the Matlab/Simulink simulation platform was used to obtain the simulation results.The results showed that the linearization mathematical model confirmed the feasibility and practicability of the proposed overall linearization model of the photovoltaic system.When the irradiance changed,the output voltage of the system returned to steady state within 0.02s at the irradiance change point,which had some adjustment ability,accuracy and anti-interference.The error between the photovoltaic cell model output and the actual output was less than 5％.The proposed method provided a theoretical basis and reference value for classical control theory to linear control and optimization of photovoltaic systems.
Keywords：photovoltaic systemstate space methodDC-DC converterDC-AC converterglobal linearization modelRouth approximation method
Publication Date：2024-12-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 533-538 )