A Simulation Study On Control Of Hybrid Renewable Energy System

This study discusses the power synchronization and load management problems associated with control strategy and simulation of Hybrid Renewable Energy System in Simulink.Many researchers have worked on the control and performance problems of DC microgrid connected to the utility under variable load demand.In the event of disturbances,the microgrid disconnects from the main grid and operates in islanded mode and it also experiences power fluctuations.After implementing their research and control strategies was observed that the power factor of the system is maintained at unity and that the total harmonic distortion of the injected current is reduced.But it was unable to enhance the system's performance and stability.All these problems are to be considered and resolved to design an optimal control system for Hybrid Renewable Energy Systems.Following work has been done in this study:1)Modelling of Biogas fueled power system:A complete simulation model is designed for biomass power system on Simulink.The proposed model consists of three main parts;modelling of a biogas reactor,modelling of a micro-turbine?MT?coupled to a permanent magnet synchronous generator,and modelling of a storage system.The model describes the dynamics of a MT.In the proposed model the maximum value of the biogas volume equals to 132.6 L/day.The proposed model is studied at normal and transient operation.The load is varied between 200-300kW.2)Modelling of Solar PV and Wind Hybrid Power SystemThe hybrid system is composed by modelling of a photovoltaic generator and a wind turbine.The radiations for Solar Panel are varied from 600 W/m2to 1000 W/m2.Maximum power for PV is 60W±5%.Voltage at P_max is 67V and Current at P_max is 0.91A.The wind turbine used with MATLAB/Simulink Model has proposed startup wind speed of15.6 mph?7.5 m/s?,Voltage of 24 VDC.Rated power is assumed 586W at 28 mph?12.5 m/s?,base rotational speed of 1700 RPM and initial rotational speed of 500 RPM.Problems of power synchronization and power fluctuations were faced during simulation but the MPPT method,Power converter topologies and control strategies for a parallel inverter helped a lot to overcome these problems to some extent.The results have showed that system's performance and stability was enhanced and that more diverse hybrid power system provide with better output efficiency and more stable power output with higher degree of reliability.The efficiency of Solar PV has been improved to 21%while of wind power up to 37%to provide better hybrid results.It also reduced power surge fluctuations a lot.The simulation results are presented to illustrate the operating principle,feasibility and reliability of this proposed system.This hybrid system allows maximum utilization of freely available renewable energy sources like wind and photovoltaic energies.For this,an adaptive MPPT algorithm along with standard perturbs and observes method is be used for the system.This configuration allows the two sources to supply the load separately or simultaneously depending on the availability of the energy sources.This work lays down a good foundation for physical hardware-level construction of this system and it can also be advanced further by adding more sources of renewable energies and applying IoT layer for control and supervision.