Simulation and analysis of three-phase parallel inverter using multicarrier PWM control schemes
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Simulation and analysis of three‑phase parallel inverter using multicarrier PWM control schemes Manikanta Swamy Dasari1 · Venkatesan Mani1 Received: 4 January 2020 / Accepted: 15 April 2020 © Springer Nature Switzerland AG 2020
Abstract Simulation and analysis of three-phase parallel inverter using multicarrier pulse width modulation such as phase disposition (PD), phase opposition disposition (POD) and alternate phase alternate disposition (APOD) are presented in this article. In this proposed work, reduced active switching count, transformers, single DC input, a high degree of modularity and redundancy are key merits and also suitable for renewable energy systems. The proposed three-phase five-level multilevel inverter with single DC source using a three-phase transformer is controlled by multicarrier pulse width modulation schemes. To generate switching pulses for five-level inverter, four carrier signals can be compared with a reference signal. The performance of the inverter is examined by using PD, POD, and APOD by modulation index (MI) starting from 0.4 to 1. Furthermore, the over-modulation region is also analyzed in this paper. The effectiveness of the system is analyzed in terms of total harmonic distortion by varying the MI of the inverter. The simulation results are verified through MATLAB/Simulink. Keywords Three-phase MLI · Reduced switch count · MC-PWM · THD
1 Introduction In recent years, the various multilevel inverter topologies have been utilized for the power conversion purpose. But, development of the multilevel inverter topologies is growing for high power and high voltage applications especially renewable energy applications. Out of the various renewable energy sources, solar PV energy is highly preferable for electrical power generation [1]. The different types of MLIs topologies have been used for the conversion of renewable energy power into the AC power [2, 3]. MLIs topologies are offered the highest conversion efficiency, lower THD, lower electromagnetic interference and lower passive filtering requirements. Furthermore, it is possible to modify new topologies with a reduced number of components [4]. There are three kinds of MLI topologies (1) diode clamped (2) flying capacitor and (3) cascaded
H-bridge inverter [5]. The many authors have been investigated cascaded H-bridge inverters for grid-connected applications. Three-phase two-level inverter is the most commonly used structure for renewable energy systems applications [6]. But it has some own drawbacks, limitation of voltage level, passive filtering requirement, and THD. To eliminate the drawbacks of the three-phase two-level inverter, three-phase inverter topology can be formed by using the six, single-phase two-level inverter that has been proposed [7]. The interesting fact in this topology is that there is no necessity for a transformer in the inverter module, but to feed power to the grid it requires a transformer owing to the common-mode current. It uses only one DC source and several single-phase transformers are connected
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