STABILITY ANALYSIS OF SEPIC CONVERTER USING MATLAB/SIMULINK
DC-DC converter is a converter where we are regulating the input voltage to get the desired output voltage which is either greater than or equal to or less than the input voltage with positive or negative polarity. A lot of dc-dc converters are available in the world out of which SEPIC (Single-Ended Primary-Inductor Converter) converter is one of them. To analyse the converter, a lot of techniques are available. This paper presents the use of MATLAB/SIMULINK to study the stability of the converter. The state space technique is applied to this higher order converter and converted into transfer function. The reduced order technique is applied to the system and compared with the higher order system which gives approximate results for all type of analysis.
Stability Analysis and Optimization of Simulated Annealing (SA) Algorithm Based PID Controller for DC-DC SEPIC Converter
This paper presents an investigative study on closed loop stability of SEPIC (Single-Ended Primary Inductor Converter) converter. Simulated Annealing algorithm based optimization technique is deployed to design an optimized controller for the SEPIC converter. Simulated Annealing (SA) algorithm is an algorithm based on the principles of thermodynamics where the analogy of cooling of metal and freezing into a minimum energy level is utilized and is widely used as an optimization technique in power electronics. State Space Average method is employed to model and obtain the transfer function of the converter based system. Hence, SA based PID controller is designed so that the stability of the converter can be evaluated and compared with conventional PID controller. Different performance parameters like percentage of overshoot, rise time, settling time and peak amplitude are taken into account to investigate the stability of the system by two fitness functions (IAE and ISE). MATLAB is used in order to carry out the simulations and hence, a comparative study is reported where the performances are evaluated.
Simulation and control of hybrid renewable energy system connected to the grid
This paper presents a control and simulation of hybrid renewable energy system connected to the grid. The studied system includes a photovoltaic panel, synchronous permanent magnet generator based wind turbine, and a battery for storage energy. The PV array and wind systems are connected to the common DC bus by a boost converter. The battery is connected by a bi-directional DC/DC converter, and then integrated into the AC utility grid via a common DC/AC inverter. In order to extract the maximum energy, a simulation study has been carried out according to the meteorological conditions (wind speed and variable solar irradiance) while maintaining power quality at a satisfactory level. In order to capture the maximum power, a MPPT algorithm is applied for both wind turbine and photovoltaic panel. The modeling and simulation of the whole system has been performed under Matlab/Simulink environment. The obtained results show that the current and the voltage of grid side are sinusoidal and alternative forms, and the power injected to the grid is around the power produced by the hybrid system.