A review on technological aspects of different PWM techniques and its comparison based on different performance parameters

SummaryIn this paper, a novel method named as level vector pulse width modulation (LVPWM) is proposed for multilevel inverters. Similar to the conventional space vector pulse width modulation (SVPWM), the proposed method is a vector‐based method in the α–β frame. Unlike the SVPWM, the variables of each of the α and β axes are considered separately. Instead of space vectors, level vectors are considered for the synthesis of the reference vectors. There is no need to consider multiple switching states, vectors, and large lookup tables in the algorithm. The appropriate switching states for the synthesis of the reference vectors are determined using simple computations at each sampling time. Generality for different inverter topologies, online implementation, simplicity of the algorithm and computations, independency of the algorithm complexity from the number of switching states, and easy extension to overmodulation region are the advantages of the proposed method. Implementation of the LVPWM in different inverter topologies is studied. The validation of the proposed modulation strategy is carried out by simulation and experimental results.

Section: Features and Comparisonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Level vector pulse width modulation for multilevel inverters

Qanbari

Tousi

Farhadi‐Kangarlu

2023

“…Different control strategies have been documented in the literature for low switching frequency (LSF) and high switching frequency (HSF) modulations. 33,34 The nearest level control (NLC) technique, which employs a round function, has been reported in the study of Kouro et al (2007) 35 for higher-level MLI topologies, which is basically the LSF technique. The selective harmonic elimination (SHE) technique, which is used to eliminate specific lower order harmonics, provides a better harmonic spectrum, and it has been described in Ahmadi et al (2011) and Memon et al (2022).…”

Section: Introductionmentioning

confidence: 99%

“…Control strategies play a vital role in generating gate pulses. Different control strategies have been documented in the literature for low switching frequency (LSF) and high switching frequency (HSF) modulations 33,34 . The nearest level control (NLC) technique, which employs a round function, has been reported in the study of Kouro et al (2007) 35 for higher‐level MLI topologies, which is basically the LSF technique.…”

Section: Introductionmentioning

confidence: 99%

A new generalized floor function based high switching frequency modulation and control technique: Multilevel inverters

Bhanuchandar

Murthy

2023

SummaryA new generalized floor function (F2) based single carrier pulse width modulation (F2SC‐PWM) technique has been proposed in this paper by considering a single‐phase 9‐level T‐type packed U‐cell (PUC) inverter topology. In literature, the conventional level‐shifted PWM technique requires (level‐1) carriers, and the unipolar phase disposition (UPD) PWM technique requires (level‐1)/2 carriers to produce a particular level of output. To reduce the complexity of control, the authors have developed single‐carrier‐based PWM techniques. However, these are not generalized in a simple manner and are especially applicable only to particular inverter topologies. In this paper, a new F2SC‐PWM technique with a single modulating signal has been introduced that is applicable to any multilevel inverter (MLI) topology. This technique is very simple to implement, and it does not internally require any large number of mathematical operations and if‐else loops. Finally, a laboratory prototype has been used to verify the operation of the 9L‐TPUC topology considering R and RL loads with respect to step change of load, step change of modulation index (MI), and step change of modulation frequecy (MF) via with new proposed control technique (PCT).

A new single modulating and single carrier‐based predictive current control technique for single‐phase quadruple boost multilevel inverter topology

Bhanuchandar,

Murthy

2023

SummaryA new floor function single carrier‐based modulated model predictive current control (F2‐SCM2PC2) technique has been proposed in this paper by considering traditional single‐phase quadruple boost switched capacitor‐based multilevel inverter (QB‐SCMLI) topology. Conventionally, the implementation process of single modulating and single carrier‐based pulse width modulation (PWM) techniques are very much complex and finite control set‐based model predictive control (FCS‐MPC) technique inherently operates with variable switching frequency (VSF) operation, which is not suitable for industrial applications. To alleviate the aforementioned issues, a new generalized closed‐loop F2‐SCM2PC2 technique has been proposed. It consists of a simple PWM implementation process and can easily be integrated with a predictive algorithm, thereby providing a constant switching frequency (CSF) of operation. The particular single modulating and single carrier‐based PWM technique with floor function is also suitable for low and high switching frequency (LSF‐HSF) operations. The validation of floor function‐based PWM technique in open‐loop and closed‐loop F2‐SCM2PC2 techniques has been effectively verified through experimentation on QB‐SCMLI topology with consideration of resistive–inductive load.