Abstract
In this paper, a so-called OPTimized Pulse Width Modulation (OPT-PWM) strategy with a minimal number of commutations for a multilevel converter (MC) is proposed. The principle is based on the reduction of the number of switch commutations by removing the unnecessary ones for each voltage level transition. The OPT-PWM strategy is applied to a five-level H-Bridge Neutral Point Clamped (HB-5L-NPC) inverter. A specific block based on a state machine is added to conventional modulation techniques to perform the transitions from a given voltage level to another one via the best trajectory with a minimal number of commutations. The principle of this additional block can be applied to any modulation technique. In this paper, the proposed strategy is validated first by simulation and then through experimental tests.
Highlights
In recent decades, the use of power converters in high-power and medium-voltage (MV) industrial applications such as the integration of renewable resources, distributed power generation systems, microgrids, energy storage systems, and motor drives has significantly increased
This paper presents a so-called OPTimized Pulse Width Modulation (OPT-PWM) modulation strategy that removes unnecessary switching to reduce the number of commutations per switching cycles with respect to the classical modulation strategy
To validate the performance of the proposed OPT-PWM applied to the HB-5L-Neutral Point Clamped (NPC) topology (Figure 2), some simulations were performed in the Matlab/Simulink environment using the SimPowerSystem library developed by MathWorks (Natick, MA, USA)
Summary
The use of power converters in high-power and medium-voltage (MV) industrial applications such as the integration of renewable resources, distributed power generation systems, microgrids, energy storage systems, and motor drives has significantly increased. In MV applications, with respect to device rating limits, MLI has attracted increasing attention in the last decade. MLI provides significant advantages for these applications. Among these advantages, the THD (Total Harmonic Distortion) improvement in output signals at low switching frequencies is most discussed in the literature. The THD (Total Harmonic Distortion) improvement in output signals at low switching frequencies is most discussed in the literature Due to this improvement, the size of the output passive filters can be reduced. A lower switching frequency allows performance with higher efficiency [1]
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