FUZZY LOGIC CONTROL FOR SOLAR PV FED MODULAR MULTILEVEL INVERTER TOWARDS MARINE WATER PUMPING APPLICATION
ABSTARCT :
This paper presents the design and implementation of Modular Multilevel Inverter (MMI) to control the Induction Motor (IM) drive using intelligent techniques towards marine water pumping applications. The proposed inverter is of eleven levels and has the ability to control the speed of an IM drive which is fed from solar photovoltaics. It is estimated that the energy consumed by pumping schemes in an onboard ship is nearly 50% of the total energy. Considering this fact, this paper investigates and validates the proposed control design with reduced complexity intended for marine water pumping system employing an induction motor (IM) drive and MMI. The analysis of inverter is carried out with Proportional-Integral (PI) and Fuzzy Logic (FL) based controllers for improving the performance. A comparative analysis has been made with respect to better robustness in terms of peak overshoot, settling time of the controller and Total Harmonic Distortion (THD) of the inverter. Simulations are undertaken in MATLAB/Simulink and the detailed experimental implementation is conducted with Field Programmable Gate Array (FPGA). The results thus obtained are utilized to analyze the controller performance, improved inverter output voltage, reliable induction motor speed control and power quality improvement by reduction of harmonics. The novelty of the proposed control scheme is the design and integration of MMI, IM drive and intelligent controller exclusively for marine water pumping applications.
EXISTING SYSTEM :
They designed a hybrid system with one inverter and the performance was compared with the existing methods.
It has very effective techniques for complicated and imprecise processes where there does not exist any mathematical model.
The proposed method consists of substituting the hysteresis controllers and the look-up table by fuzzy logic switching vector selection scheme.
The main advantages of Fuzzy logic controller are adapted to the nonlinear control command and not based on the model of the induction machine.
DISADVANTAGE :
The two critical issues occurred in power converter are voltage digression and frequency deviations which leads to harmonics distortions.
The main impact of the proposed control scheme is to reduce the steady-state error of the induction motor speed control and deteriorate harmonics at the output voltage of modular multilevel inverter.
To overcome the drawback of DC motor, induction motor is highly preferred in the ship.
PROPOSED SYSTEM :
In this way, the proposed grid connected PV power conversion system generates seven-level output voltage and a sinusoidal output current which is inphase with the utility voltage and is fed into the grid.
This paper proposes a solar power generation system to convert the dc energy generated by a solar cell array into ac energy that is fed into the utility.
The proposed solar power generation system is composed of a dc–dc power converter and a seven-level inverter.
ADVANTAGE :
A solar fed eleven level inverter with intelligent control techniques aimed to attain improved performance parameters for marine applications.
The performance of the multilevel inverter fed IM drive is examined with PI and FLC based controllers.
The solar photovoltaic’s based energy system is implemented in ship which delivers the required power incorporating a novel technique to decrease emissions to augment the renewable energy efficiency and also to perk up the stability of power.
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