Controlling and Analysis of Boost converter using Sliding mode controller at variable Conditions

Abstract

As the requirement of power increases, it is required to increase the generation on demand. Now a days, solar PV and wind are increasingly used for generation. The power collected from these energy source need to be converted using DC-Dc or AC-Dc converters. The main converter used is Boost converter for step up this voltage. These sources are variable by nature, so problem arises is to maintain constant required output in all conditions. Boost converter converts the input voltage into higher value of voltage but as per the input is received. This issue can be resolved by using sliding mode control of the converter. There are many theories to implement this technology with converter but the problem arises when the inductance and capacitance changes as load varies. The proposed work is to resolve this problem by using sliding mode controller with modified values of parameters and beta factor for precise values using feedback, close loop system. The input source is taken as DC source voltage at variable conditions. The modelling done in MATLAB/Simulink software. Index Terms: Solar PV, Wind, Boost Converter, slide mode controller I. BOOST CONVERTER For example, applications for boost converter operations are DC Motor's rebounding breaking circuit and regulated DC power supply. In this type of converter, the output voltage is always greater than the input voltage. Therefore, the speed-up converter can be applied to the MPPT system where the output voltage should exceed the input voltage. Such as in the systems connected to the grid, where the boost converter holds a high output voltage, even if the PV array voltage falls at lower prices. Circuit topology of step-up converter as shown in Fig. 1 [1-3] Fig.1. Equivalent Circuit of Boost ConverterWhen the converter is working on the state of stable-state, then the duty ratio can be expressed by D, equation (1). Where D is the ratio of the voltages called duty ratio, and they indicate the output volts of input and converter output, respectively. From the above equation, it can be seen that, the increase in the duty ratio will increase the value of the voltage in the output of D, besides that, the change in duty ratio results in changes in current and output of the converter driven converter operated in continuous conduction mode. The filter inductor and capacitor can be calculated by following the equations.