Development and Comparative Study of Two-input Fuzzy Controller over Single-input in 1-? PWM Inverter

paper presents the comparison between the two modes of PWM inverters for various load conditions. SPWM inverter has been modeled in this paper using two types of fuzzy logic controller depending upon the input to the FLC. Inverters are of great requirement for processes to provide the best and accurate results in different working condition such as for industrial, commercial, in drive power systems etc. So for their uninterrupted working in that field, there is need to deploy the device which works during the failure of power supply system but with high quality response. The method for generating pure sinusoidal voltage waveform at the PWM inverter output is described in this paper. Harmonics have been under the continuous research as these are the basic and old problem (1) which continues to affect the performance of the power systems in various applications depending upon the types of loads. In order to create best output of PWM inverter, fuzzy technique has been taken into consideration as it deals with non-precise inputs. All results are shown using MATLAB/Simulink simulation which shows that inverter output current is in sinusoidal waveform and in phase with line voltage, and current harmonics are in the limits of international (IEEE) standards (<5%)(2). The ultimate goal is to yield output voltage with minimum distortion as low as possible. Dominance of FLC's over the conventional controllers has become tight as it can work with imprecise inputs, can handle nonlinearity and it is more robust than conventional nonlinear controllers (5). In this paper, the comparative study has been carried out between the model using different kinds of FLC controllers. First controller is of SISO type and second one is TISO type. Both the controllers have shown the way to design the appropriate model for harmonic elimination in Sinusoidal PWM inverters. The first type of the controller is the part of the second type of controller. The compatibility of the system has been shown with various load conditions to demonstrate the increased working range of the system. Usage of FLCs is quiet easy due to quick maintenance processes, availability and explores the potential and feasibility of fuzzy logic control schemes that are suitable for harmonic current mitigation and inverter voltage control to improve the performances. The performance of fuzzy controller is evaluated through computer simulations. The results show that how TISO has become superior to SISO type FLC in this harmonic reduction model.