This paper aims at the discussion of the performance parameters evaluation of Non isolated Single Ended Primary Inductance DC-DC Converter over Buck Boost and Cuk type converter, whose primary role in photovoltaic power generation is to maintain the output voltage constant irrespective of changes in the input, with improved efficiency and less input current ripple. The paper includes dynamic modeling and simulation of a photovoltaic cell under varying insolation and changes in temperature along with the modeling of the three topologies mentioned above taking the unregulated voltage from the pv cell and their performance parameters are being compared to choose the better converter topology for solar power generation system. For modeling the pv cell the single diode equivalent diagram is considered simulated using MATLAB / Simulink platform to obtain PV and IV curves of solar cell with variable temperature and variable irradiance. Also the dc-dc converters are modeled in MATLAB, and the simulation results are compared.
The prime role of a renewable resource-based DC hybrid power system is, to maintain the output voltage constant with higher efficiency. In order to achieve this the duty cycles of the converter switches are dynamically controlled. Multiple input single output (MISO) converter uses separate controller for adjusting the duty cycle, this complicates the design and implementation of the system. Hence, to overcome this limitation a centralized controller is used. The control strategy depends on the pattern of gating signals given to the converter switches. When independent controller is employed, then gating signals of any pattern can be used to drive the switches. However, if a single controller is used, and then a definite pattern is very much essential otherwise, the output voltage and efficiency get affected. In this paper, an attempt is made to validate and evaluate the performance parameters of MISO converter with two pattern of gating signals; they are synchronized and unsynchronized pulses at their rising edge. The control strategy focusses on the generation of these gating pulses. PID controller is tuned appropriately to determine the gains to achieve the stability of the proposed converter. The dual input power converter validated to show how the PWM pattern affects the efficiency, ripple and regulation of the converter. Using MATLAB SIMULINK platform, the simulation of the proposed concept with dual input converter in closed loop is validated. Simulation results proves that synchronized pulses gives DC efficiency of 87% at designed output of 12V output. Converter with unsynchronized PWM pulses operates at lesser efficiency of 75% and the output voltage is of 10V.
There is a need for more flexible and reconfigurable dc-dc converters. This has pushed designers to seek for alternative ways to control the PWM modulated switch inside the dc-dc converter. This paper presents the results of design and implementation of a fully customizable Arduino based controller for a SMPS (buck converter). The controller presented gives the user a high degree of autonomy and permits the variation of several output parameters such as the magnitude of regulated voltage, the percentage of voltage regulation, the switching frequency and therefore the amount of ripple in the output by simple modifications of the code, eliminating the need for hardware changes. The flexibility of the controller has been illustrated by reconfiguring it to meet the requirements of different design specifications. The results obtained have been analysed, the possible advantages of such a reconfigurable buck converter over other existing solutions and its applications have been discussed.
<p><span>The objective of this paper is to propose a modified Single Ended Primary Inductance converter topology with passive lossless snubber cell to achieve Zero Voltage Switching (ZVS) of the device near turn off and Zero Current Switching (ZCS) near turn on. By using the snubber cell effectively with the converter reduces the switching stress by restricting the large variations in voltage and current. The detailed analysis of the circuit with relevant waveforms of the circuit is described. The circuit is designed for a load of 100W at 12V output from an input source ranging between 20-30V. The circuit is modelled in MATLAB Simulink platform and the parameters are compared with conventional circuit. From the results it is shown that the proposed circuit operates at a lesser voltage stress and at higher efficiency than conventional one.</span></p>
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