×
The submission system is temporarily under maintenance. Please send your manuscripts to
Go to Editorial ManagerThis paper presents a proposed configuration of paralleling scheme PWM DC/DC buck converter. The topological structure and operation principles are presented. A Bode plot diagram technique is used to study the stability of the scheme for different values of controller parameters and with a number of parallel modules. It is found that the results are confidence, and the proposed scheme can be used in high power applications by increasing the number of parallel modules.
To support medium-voltage and high-power applications in flexible power systems, multilevel inverters, which are commonly referred to as MLIs, are currently being developed. The conventional configuration of a multilevel inverter, which aims to accommodate a wide range of applications, necessitates the use of additional switches and sources and is subject to certain constraints. Through the built-in control of the boost converter and the PWM for each level, this research aims to discover a new method that uses a boost converter to obtain an MLI with a minimum number of switches, maintaining this number constant as the number of levels increases. The research results clearly demonstrate the reduction of THD to small values through the use of the boost converter in the proposed method. MLI is usually used in renewable energy applications to obtain certain voltages, for example, from solar cells, therefore, simulations were conducted within the framework of photovoltaic (PV) cells as an input source. When MLI configuration integration is added to a PV system, a lower number of switching components are used for a defined number of voltage output levels. This is in contrast to typical multilevel inverter topologies, which require a larger number of switching components to manage the gating pulse of PV-based MLI. The MATLAB/SIMULINK program assisted in carrying out this work.
Use of multilevel inverters is becoming popular in the recent years for high power applications. The important feature of these inverters is of having low harmonics content in the output voltage. The switching angles in a multilevel inverter are computed so as to produce an ac output voltage with minimum harmonics. A new control circuit is designed to achieve these angles. This control circuit has the ability to control the RMS output voltage using sinusoidal pulse width modulation (SPWM). The results presented in this work prove the ability of the designed control circuit to gain the required ac output voltage with minimum distortion.
Soft-switching technique can substantially improve the performance of power converters, mainly due to the increase of switching frequency, that result in better modulation quality. This is more concerned particularly in the high power applications, where devices [gate turn off (GTO) or something else similar) can not operate over a few hundreds of hertz in conventional hard switching converter structures. In this paper, design and analysis of moderate power ZCT three-phase PWM inverter has been presented. Also, the designed inverter and its novel control circuit is implemented experimentally to investigate its characteristics with this new zero-current transition ZCT technique.
Soft commutation techniques have been of great interest during the last few years in power supply switching applications. The recently developed Zero-Voltage transition (ZVT) and Zero-Current transition (ZCT) pulse width modulation (PWM) technique incorporated soft-switching function into PWM converters, so that the switching losses can be reduced with minimum voltage/current stresses and circulating energy. The ZCT technique can significantly reduce the switch turn-off loss which is usually the dominant switching loss in high-power applications. In this paper the steady state analysis and design of the ZCT PWM boost converter are introduced. Control and drive circuit have been designed to drive a 100 Watt ZCT PWM boost converter to experimentally investigate its features and characteristics.