PWM Control Techniques for Single-Phase Multilevel Inverter Based Controlled DC Cells

Abstract

This paper presents a single-phase five-level inverter controlled by two novel pulse width modulation (PWM) switching techniques. The proposed PWM techniques are designed based on minimum switching power loss and minimum total harmonic distortion (THD). In a single-phase five-level inverter employing six switches, the first proposed PWM technique requires four switches to operate at switching frequency and two other switches to operate at line frequency. The second proposed PWM technique requires only two switches to operate at switching frequency and the rest of the switches to operate at line frequency. Compared with conventional PWM techniques for single-phase five-level inverters, the proposed PWM techniques offer high efficiency and low harmonic components in the output voltage. The validity of the proposed PWM switching techniques in controlling single-phase five-level inverters to regulate load voltage is verified experimentally using a 100 V, 500 W laboratory prototype controlled by dspace 1103.

Design and Implementation of a New Multilevel Inverter Employing Reduced Components

“…From Table 3, THD of the proposed inverter is better than in [24] for seven-level output voltage due to the switching pattern used in the mentioned reference has distorted the output voltage also efficiency is better due to lower switching devices used in the proposed inverter. Also, five-level output voltage in [25] almost has better efficiency compared with the proposed inverter with five levels due to the inverter is operated at higher rated power compared with the proposed inverter. As shown from the figure the inverter efficiency is increased and THD is reduced with an increment of MI.…”

“…However, this topology uses a large number of components. The modular multilevel inverter (MMLI) has been proposed in [25]. To generate higher levels by this topology, three components (one DC source and two power switches) are added which increases the number of components.…”

A single‐phase modular multilevel inverter based on controlled DC‐cells under two SPWM techniques for renewable energy applications

“…Therefore, minimizing the switches number and control difficulty is an essential issue for practical operation 25 . Many modified families of MLIs, considering a lower number of switching devices, have been recently proposed 5,19,20,26‐40 . In Ref.…”

A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters

“…As a result, their topologies and control strategies have been the focus of a lot of research. Compared with two-level inverters, multi-level inverters have better performances, such as lower voltage derivatives (dv/dt), reduced voltage stress on power switching devices, and lower total harmonic distortion (THD) of output waveforms [3]- [10]. Akira Nabae proposed a new neutral-point-clamped (NPC) pulse width modulation (PWM) inverter in 1980, which is a typical topology for three-level inverters [11], as shown in Fig.…”

“…Each phase has 3 working states. Therefore, this inverter has 27(3 3 ) working states in total, which corresponds to 27 space vectors.…”