Simplified transformer‐based multilevel inverter topology and generalisations for renewable energy applications

Behara, Siva; Sandeep, N.; Yaragatti, Udaykumar R.

doi:10.1049/iet-pel.2017.0383

Cited by 29 publications

(18 citation statements)

References 34 publications

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“…32. A similar transformer based configuration by cascading half-bridges is reported in [131]. A similar concept with two dc sources is reported in [162].…”

Section: Single-phase Transformer Based Reduced Components (Tbrc) Rsc-mlimentioning

confidence: 73%

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A Survey on Reduced Switch Count Multilevel Inverters

Vemuganti¹,

Sreenivasarao

Ganjikunta

et al. 2021

IEEE Open J. Ind. Electron. Soc.

124

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An efficient and cost-effective power converter is a pre-requisite for the modern power applications. With the evolvement of matured medium power self-commutated switching devices, multilevel inverters (MLIs) are emerged as a promising solution for high-power medium-voltage applications. Though, MLIs are performing a promising role in industrial applications, their high device count, size, cost and control complexity have restricted their market penetration. To address the disadvantages of MLIs, researchers are continuously contributing to new generation topologies under the name of reduced switch count (RSC) MLIs. From the past decade, numerous RSC-MLIs topologies have been reported for various applications. Therefore, this paper presents a comprehensive review and classification of RSC-MLI topologies, in terms of their structure, features, limitations, suitability and selection for specific applications..

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“…32. A similar transformer based configuration by cascading half-bridges is reported in [131]. A similar concept with two dc sources is reported in [162].…”

Section: Single-phase Transformer Based Reduced Components (Tbrc) Rsc-mlimentioning

confidence: 73%

“…Transformer-based reduced components (TBRC) topologies [129][130][131] Two-Phase five-level converter with Scott transformer [132,133] H4-H6 topology [134]…”

Section: Transformer Based Rsc-mlismentioning

confidence: 99%

A Survey on Reduced Switch Count Multilevel Inverters

Vemuganti¹,

Sreenivasarao

Ganjikunta

et al. 2021

IEEE Open J. Ind. Electron. Soc.

124

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show abstract

“…In addition to the reduction in D E , the t r also determines the switching losses and, in turn, the efficiency of the converter. The cyclic turn on E on and turn off E off energy losses during every switching transition are expressed as follows [29]:…”

Section: Experimental Results and Performance Evaluationmentioning

confidence: 99%

“…In addition to the reduction in

D_{normalE}

, the

t_{normalr}

also determines the switching losses and, inturn, the efficiency of the converter. The cyclic turn on

E_{on}

and turn off

E_{off}

energy losses during every switching transitionare expressed as follows [29]:

E_{on} = \int_{0}^{T} V false(t false) \cdot I false(t false) \cdot d t = - \frac{V_{ds}}{t} (t - t_{on}) \cdot \frac{I_{d}}{t_{on}} t \cdot d t

E_{on} = \frac{1}{6} V_{ds} I_{d} t_{on}

E_{off} = \int_{0}^{T} V false(t false) \cdot I false(t false) \cdot d t = - \frac{I_{normald}}{t} (t - t_{off}) \cdot \frac{V_{ds}}{t_{off}} t \cdot d t

E_{off} = \frac{1}{6} V_{ds} I_{d} t_{off}

where

V_{ds}

and

I_{normald}

are the voltage across the switch and currentthrough it, respectively. From (10)and (11), the energy losses arelinearly proportional to the …”

Section: Experimental Results and Performance Evaluationmentioning

confidence: 99%

Analysis, design, and implementation of an improved gate driver forhigh switching frequency EV application

Tomar

Sandeep

Verma

et al. 2020

IET Power Electronics

Self Cite

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Electric vehicle (EV) battery chargers operate from moderate switching frequency (MSF) to high switching frequency (HSF) to achieve high power density. To operate the HSF power electronic devices, the selection of gate drivers and its associated components is crucial. Laboratory developed gate driver circuits (GDCs) often fail to drive these HSF devices adequately due to noise vulnerability, PWM duty loss and common-mode currents. Further, at MSF and HSF ranges, the gateto-source terminals of the device are subjected to high voltages due to unwanted noise resulting in false turn-on of the switch leading to the converter failure. In this paper, firstly, an improved GDC and it's associated component selection criteria are proposed for HSF EV application. The proposed GDC is simple in structure with minor components; thus, it is cost-effective and highly reliable. Secondly, the proposed GDC is compared with the other commercially available competent GDCs. Power losses, cost and dynamic switching performance are the figures-of-merit for the quantitative assessment. From the comparison, it will be shown that the proposed GDC exhibits an overall superior performance among the popular GDCs. Finally, the distinctive features of the proposed GDC are experimentally validated for several test cases and the obtained results are presented.

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“…[9][10][11] The need for multiple DC voltage sources or multiple semiconductors for increased output voltage levels is one of the major disadvantages of the aforementioned MLIs. 12,13 The use of transformers in MLI topologies has many advantages over traditional MLIs, such as require a single DC source, low number of switches, and high reliability, as well as…”

mentioning

confidence: 99%

Isolated seven‐level inverter for grid‐connected power systems with predictive control method

Ortatepe

2022

Circuit Theory & Apps

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A novel isolated 7‐level (7L) multi‐level inverter (MLI) topology for grid‐connected medium and high voltage power applications is presented in this paper. The topology consists of two isolated transformers with different winding ratio and four switches connected to a single‐phase grid. This topology provides a great advantage over conventional MLIs by reducing passive and active components to allowing a 7L output voltage. Moreover, model predictive control (MPC) method is implemented to 7L‐MLI to generate gate signals of switches and ensure capacitor voltage balancing and grid connection. Performance of proposed topology has been confirmed by in‐depth analysis under simulation and laboratory setup with existing studies. Experimental results of a 1.5 kW 220 Vrms prototype are presented to support the simulation results. The prototype shows that the harmonic results match the limits of the IEC 61000‐3‐2 standard and show a better performance for grid connection and capacitor voltage balancing than conventional ones.

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Simplified transformer‐based multilevel inverter topology and generalisations for renewable energy applications

Cited by 29 publications

References 34 publications

A Survey on Reduced Switch Count Multilevel Inverters

A Survey on Reduced Switch Count Multilevel Inverters

Analysis, design, and implementation of an improved gate driver forhigh switching frequency EV application

Isolated seven‐level inverter for grid‐connected power systems with predictive control method

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