Simulation Of Photovoltaic System Using 13-level Inverter Based On Fuzzy Logic Control

Human activities are causing climatic changes that result into global warming.In recent years,there have been campaigns for clean energy utilization that come from renewable en-ergy sources.As a result,clean energy is becoming increasingly prevalent around the world.This means that renewables are increasingly displacing "dirty" fossil fuels in the power sec-tor,offering the benefit of lower emissions of carbon and other types of pollution.However,not all sources of energy marketed as "renewable" are beneficial to the environment.Renew-ables are a low-cost and environmentally-friendly way to get the energy we need to power our society.The most common examples of renewable energy are solar energy,wind power,geothermal power,hydropower,and biomass.Thanks to the intensive research and develop-ment,Photovoltaic(PV)system has become an alternative energy source on a large scale.Almost all conventional solar energy systems are running on stand alone method,which only provides power for immovable loads.The advantages of such a system are that both the control technique and system configuration is easier.But,they usually need batteries for energy storage.Increasing the cost of the system dramatically.Thus,PV power-driven inverter methods with network connectivity are aimed to unlock this constraint.PV systems generate DC power.Therefore,there is need to convert the DC power generated into AC for consumptions as almost all appliances take AC as their input source of energy.This conversion is done by using a device called inverter.However,conversion of DC to AC power in inverter generates harmonics which affects electronic devices of the inverter.So-lar power is one of the sources of power that requires the use of inverters in order to carry DC to AC power conversion.Apart from stability and reliability challenges in controlling the solar power,the total harmonic distortion is required to within limits for optimal oper-ation.Multilevel inverter(MLI)topology is can be used to solve the problem of THD.It has almost sinusoidal shape of stepped AC at its output.Among the various types of MLI topologies,cascaded H-bridge inverter(CHB-MLI)is more adaptive for PV usage,where for each H-bridge unit;each PV model behaves as an isolated DC source.In this study we design a PV model as a source power source to a system and displays the po-tential of a single-phase 13-level CHB inverter.We carry out simulation to demonstrate the capability of a single-phase 13-level CHB inverter.We apply sinusoidal pulse width modu-lation(SPWM)to switch the insulated-gate bipolar transistor(IGBT)devices.FLC is used to reduce the THD level by finding the suitable set of IGBT switch signal in order to improve the power quality.Matlab/Simulink environment is used to design and perform the simula-tion for the proposed system,and to demonstrate the effectiveness of the proposed method in reducing THD in CHB 13-levelinverter.We show the improvement in the operation and reduction in the complex harmonicsignal effects of the CHB 13-levelinverter.The over-all proposed system is designed inMatlab/Simulink software.The Matlab/Simulink/M File allows the overall system implementation andsimulation to find the simulation results.The system includes both the controller and the modulator,in this way,we can obtain a new one-step controller.The results show that the dynamic behavior ofthe FLC is much better than the traditional proportional integral derivative(PID)controller.Additionally,the proposed PV system’s operationcan be divided into two types,the stand alone method and the grid tied method.