Design and Implementation of Takagi-Sugeno Fuzzy Tracking Control for a DC-DC Buck Converter

This paper presents the design and implementation of a Takagi-Sugeno (T-S) fuzzy controller for a DC-DC buck converter using Arduino board. The proposed fuzzy controller is able to pilot the states of the buck converter to track a reference model. The T-S fuzzy model is employed, firstly, to represent exactly the dynamics of the nonlinear buck converter system, and then the considered controller is designed on the basis of a concept called Virtual Desired Variables (VDVs). In this case, a two-stage design procedure is developed: i) determine the reference model according to the desired output voltage, ii) determine the fuzzy controller gains by solving a set of Linear Matrix Inequalities (LMIs). A digital implementation of the proposed T-S fuzzy controller is carried out using the ATmega328P-based Microcontroller of the Arduino Uno board. Simulations and experimental results demonstrate the validity and effectiveness of the proposed control scheme

Effect of Nonuniform Partial Shading on the Performance of Photovoltaic Systems

This paper deals with the influence of the shading problem on the electrical production of a photovoltaic generator based on the analysis of the I-V and P-V characteristics of the PV generator for different operating scenarios. The shading problem not only causes energy losses but also increases the non-linearity of the I-V and P-V characteristics of photovoltaic systems. The choice of the model is an essential step to allow analysis and evaluation of the performance of photovoltaic generators. The single diode model was presented in the MATLAB / SIMULINK software. The study began with the presentation of the characteristics of a module, a comparison was made between the values of the obtained electrical parameters and those supplied by the manufacturer. To show the effect of shading on photovoltaic systems another comparative study was presented between a group of series-connected modules and another connected in parallel, both exposed to nonuniform partial shading. The obtained simulation results show that the influence of shading on a set of modules connected in series is greater than that of a set of modules connected in parallel under the same operating conditions