An Asymmetric Source Configuration of Single-Phase CHB-MLI Topology with a Generalized Reduced-Carrier Modulation Technique

SummaryIn this paper, a new floor function (F2) single‐carrier (SC)‐based modulated model predictive current control technique (M2PC2T) has been proposed by considering the conventional single‐phase five‐level packed U‐cell (PUC5) inverter topology. Generally, to regulate the output current, the finite control set‐based MPC technique without a modulator inherently operates with variable switching frequency, and it is unsuitable for industrial applications. To alleviate this, authors have implemented M2PC2T, which provides constant switching frequency of operation. In this technique, generally, the predictive algorithm has been integrated with any modulation stage. However, while the implementation of pulse width modulation (PWM) techniques, most authors have used conventional PWM techniques which further increases the control complexity as the level number increases. In this manuscript, a simple and generalized F2‐SC‐PWM technique has been proposed and integrated with the predictive algorithm. This PWM technique implementation process is very simple as compared with all conventional PWM techniques since even if the level number increases, the number of modulating and carrier signals is always only one. Finally, the complete closed‐loop control technique is called a generalized F2‐SC‐M2PC2T which is suitable for all stiff direct current (dc) sources and switched capacitor‐type multilevel inverter (MLI) topologies. The proposed control technique (PCT) has been experimentally verified with different transient and steady‐state case studies by considering resistive‐inductive load.

Section: Introductionmentioning

confidence: 93%

A new floor function single‐carrier‐based modulated model predictive current control technique for single‐phase PUC5 inverter topology

Bhanuchandar,

Murthy

2023

“…[3][4][5] Classical MLI topologies include diode clamped (DC), flying capacitor (FC), and cascade H-bridge (CHB), and these configurations need 56 clamping diodes, 28 FCs, and four equal isolated dc sources for generating 9-level output. [6][7][8] The CHB inverter generates 9-levels with a 1:3 source arrangement and naturally employs two H-Bridges, allowing the blocking voltage of switches to be increased. 9 Generally, the cost of switching devices in MLIs is heavily influenced by the per unit value of total standing voltage (TSV pu ).…”

Section: Introductionmentioning

confidence: 99%

“…To solve the shortcomings of MLIs, researchers are constantly developing new topologies called reduced switch count (RSC) MLIs 3–5 . Classical MLI topologies include diode clamped (DC), flying capacitor (FC), and cascade H‐bridge (CHB), and these configurations need 56 clamping diodes, 28 FCs, and four equal isolated dc sources for generating 9‐level output 6–8 . The CHB inverter generates 9‐levels with a 1:3 source arrangement and naturally employs two H‐Bridges, allowing the blocking voltage of switches to be increased 9 .…”

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 generalized high switching frequency (HSF) carrier and low switching frequency (LSF) carrier less-based PWM techniques have been discussed in previous studies, 13,14 respectively, but these are suitable only for cascaded H-bridge (CHB) inverter topologies. The simple generalized carrier-less nearest level control (NLC) has been addressed in literature, 15,16 but this technique works under only LSF operation and is well suitable for higher-level inverter topologies.…”

Section: Introductionmentioning

confidence: 99%

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.