Summary
This article investigates a modified circuit for multilevel converter based on cascaded basic units. The proposed circuit can be operated in both symmetrical and asymmetrical source configuration. The magnitudes of two dc source in basic units can be adopted for symmetrical and asymmetrical configuration. In the symmetrical configuration, the magnitude of the dc voltage source is identical for each unit. On the other hand, the values of the dc voltage source for basic units are unequal in asymmetrical configuration. In order to generate a large number of voltage levels with less number of components, several methods are suggested for determining the magnitude of dc voltage source. Comparison analysis proves that the suggested circuit needs less number of components, reduces power loss, and improves the efficiency of the inverter. Moreover, the standing voltage across the switches is acceptable compared with contemporary topologies. Simulation and experimental results for 15‐, 17‐, 23‐, and 31‐level inverters are analysed to validate the performance of investigated topology.
Nowadays, multilevel inverters (MLI) are receiving remarkable attention due to salient features like less voltage stress on switches and low total harmonic distortion (THD) in output voltage. However, the required switch count increases with number of voltage levels. This paper presents a new topology for asymmetric multilevel inverter as a fundamental block. Each block generates 13-level output voltage using eight switches and four unequal dc voltage sources. The proposed configuration offers special features such as reduced number of switches, isolated dc sources, cost economy, less complex and modular structure than other similar contemporary topologies. Moreover, significant reduction in voltage stress on the circuit switches can be achieved. Comparative studies of proposed topology with the conventional and recent topologies have been presented in terms of power switches, gate driver circuit requirement, isolated dc voltage sources and total standing voltage. Multicarrier-based sinusoidal pulse width modulation (SPWM) scheme is adopted for generating switching signals using dSPACE real-time controller. In addition, proposed topology offers a fewer number of ON-state switches that lead to reduction in power loss. The proposed topology is validated through simulation and experimental implementation.
In this paper, impacts of renewable sources on the adequacy of a 2 area system are presented. Integration of popular renewable sources like photovoltaic (PV) and wind is forcing the operational planner to operate differently. Here, an effort has been made to propose some planning scenarios for 2 area system on the basis of renewable sources integration, and reliability is evaluated corresponding to each scenario. Loss of load expectation is popular method for adequacy assessment following 2 state principle (available or unavailable) of conventional sources. Photovoltaic and wind system never follow 2 state principle unlike conventional. Existing PV module configuration determine the unavailability rate of PV plant considering component failure. Random wind speed is simulated using time series auto regressive moving average model. Wind turbine characteristics and simulated wind speed create multistate wind energy conversion system and reduced by apportioning method to predict unavailability rate. A simple 2 area system is considered to validate the efficacy of proposed theme.
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