ABSTRACT:
In this, fuzzy logic controller is designed for quadratic boost converter for voltage regulation. The performance of the proposed converter with proportional-integral (PI) controller and FLC controller are analysed from the simulation results. A voltage mode control is provided to get regulated load voltage irrespective of the changes in supply. FLC controller is used for the voltage mode control and the performance of the proposed controller is estimated and comparison is made with conventional PI controller. The simulation work is done with MATLAB/Simulink software.


INTRODUCTION

In past, the conventional energy sources such as coal, gas, oil, etc, are utilized for power generation until the renewable sources are introduced for electrical power generation. Also, the regulations regarding emission of pollutants and impact on environmental pollution reduction caused the quick growth on these renewable sources. The Photovoltaic (PV) energy was utilized for charging the batteries in isolated areas and wind turbines also used in few occasions. These two energy sources are extended over other applications also and they both get combined to design hybrid system after the idea of grid connected system is introduced. Several new ideas regarding control circuits, design of converters, MPPT (Maximum Power Point Tracking), real and reactive power control and injection, etc, are proposed regarding the hybrid energy resources. The key issue in this is the availability of irradiation in solar and wind speed cannot be predetermined as it relied on the environmental conditions. The wind and solar energies are complement to each other and provides power almost all over the year is the main reason for choosing them for hybrid power generation. Hence these two can be used as main power sources and also it is possible to include an auxiliary power source such as battery, diesel plant, biogas, fuel cell, etc, as backup. As the power generation unit consists of multiple sources, it is more reliable than individual sources irrespective of the location of the power generation unit. It can be utilized in remote villages as the distribution of electrical energy from grid is near to impossible in those locations. A control strategy is important for the hybrid system in order to regulate the variables such as voltage, power, etc. As these renewable sources are volatile in nature voltage control is essential for the reliable power generation and distribution. Various renewable sources are interlinked using dc bus in which the voltage regulation is provided using controllers such as PI control (Proportional Integral), PID control (Proportional Integral Derivative), SM control (Sliding Mode Control), etc, in order to enhance the performance of the HRES.