Development of an enhanced multilevel converter using an efficient fundamental switching technique

Kar, Pratik Kumar; Priyadarshi, Anurag; Karanki, Srinivas Bhaskar

doi:10.1016/j.ijepes.2020.105960

Cited by 19 publications

(5 citation statements)

References 37 publications

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“…In particular, transformerless half-bridge MMC topologies have become popular in medium and high-power applications [5], [7], where the number of cells increases and, consequently, the modulation scheme, modeling process, and control design become more convoluted [8]- [10]. Hence, much of the research works on MMC topologies have addressed topics such as modulation issues [11], modeling techniques [12], and control oriented issues such as tracking of the output current and regulation of the so-called circulating currents [3], besides the voltage (or energy) regulation and balance of capacitors voltages of every cell [8]- [10], [13]- [21].…”

Section: Introductionmentioning

confidence: 99%

An Energy Model-Based Controller for a Three-Phase Grid-Tied Modular Multilevel Converter

Catzin-Contreras,

Escobar,

Valdez-Resendiz

et al. 2024

IEEE Access

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This paper presents the modeling, control and evaluation in a real-time simulation (RTS) of a three-phase multilevel inverter based on the modular multilevel converter (MMC) topology. The developed model for MMC includes four decoupled state variables per phase, which are instrumental for the control design, namely injected (output) current, circulating current, total energy, and energy balance between arms. Based on this model, a control scheme is proposed with the aim to regulate and balance the total energy on each converter's phase, regulate the circulating currents, and inject a three-phase current synchronized with the grid voltage. As part of the control process, the proposed controller generates the reference for a modulation scheme to obtain the switching sequence for each converter's cell, which, in this case, is the phase-shifted carrier-based pulse-width modulation (PSC-PWM). As it was already reported in the literature, this particular modulation guarantees self (natural) balance of all capacitor voltages, i.e., they converge to the same steady-state average value without the need of any external balancing controller.INDEX TERMS Modular multilevel converter, phase-shifted carrier-based pulse-width modulation, realtime simulation. I. NOMENCLATURE jth phase, j ∈ {1, 2, 3} k iD energy balance loop -integral gain k pD energy balance loop -proportional gain k iT energy regulation loop -integral gain

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Section: Introductionmentioning

confidence: 99%

An Energy Model-Based Controller for a Three-Phase Grid-Tied Modular Multilevel Converter

Catzin-Contreras,

Escobar,

Valdez-Resendiz

et al. 2024

IEEE Access

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“…The necessity for a large component count and control complexity plagued traditional MLIs [4][5][6]. Recently reduced switch MLI topologies for various applications were presented [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency evaluation of a three-phase extendable-level inverter

Aishwarya

2023

Eng. Res. Express

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This paper details the energy efficiency evaluation of an Extendable-Level Inverter (ELI). ELI achieves very high voltage levels, excellent DC-link utilization, and very good power quality with a minimized component count. An experimental setup of a three-phase ELI is implemented to investigate the power losses and to calculate efficiency. The ELI obtained a high efficiency of 99.09% with reduced switching and conduction power losses of 0.1% and 0.81% respectively. Comparative analysis of the theoretical calculation, simulation results and hardware results validated the consistency of a very high efficiency of over 99.09% for a broad range of operating frequencies. The power quality metrics conformed to the limits prescribed in the IEEE 519 standard.

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“…In comparison with symmetrical voltage sources-based MLI, the MLIs that are designed with unequal voltage sources require less voltage sources and smaller number of switching devices to develop high level output voltage. Several structures of MLIs with asymmetrical voltage sources of favorable ratios are presented to achieve higher level output voltage with better efciency [6][7][8][9]. In order to obtain more steps across MLI output voltage, number of DC sources is needed to increase.…”

Section: Introductionmentioning

confidence: 99%

THD Reduction of Improved Single Source MLI Using Upgraded Black Widow Optimization Algorithm

Mohanty,

Chatterjee,

Mohanty

et al. 2023

International Transactions on Electrical Energy Systems

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An upgraded Black Widow Optimization algorithm for obtaining the ideal switching angles of a reduced structure multilevel inverter is proposed in this paper with minimum voltage THD. The conventional BWO algorithm has been modified and proposed to solve the THD minimization problem with faster convergence rate, lesser tuning variables, and lesser number of equations than the other existing nature inspired algorithms. The reduced structure MLI is designed with three asymmetrical DC voltage sources of ratio 1 : 2 : 4 to generate 15-level output voltage which requires reduced number of switching devices in comparison with the existing topologies of equivalent voltage level. The asymmetrical DC voltage sources to the MLI are derived from a single DC voltage source using a multisecondary winding DC-DC converter in order to provide the isolation between the load side and source side. The proposed modified BWO algorithm reduces the complexity of solving the nonlinear equations to achieve the best result by avoiding the local optima. To verify the effectiveness of the upgraded BWO algorithm, the optimization problem for three phase fifteen level MLI has been solved using the genetic algorithm, BFO algorithm, and PSO algorithm. The results for the above three applied algorithms are compared with the upgraded BWO and presented. The proposed algorithm has minimized the output voltage THD to 1.83% at 0.88 modulation index. The developed scheme has been corroborated with the help of MATLAB simulation and the results have been verified through a hardware model developed in laboratory.

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Development of an enhanced multilevel converter using an efficient fundamental switching technique

Cited by 19 publications

References 37 publications

An Energy Model-Based Controller for a Three-Phase Grid-Tied Modular Multilevel Converter

An Energy Model-Based Controller for a Three-Phase Grid-Tied Modular Multilevel Converter

Energy efficiency evaluation of a three-phase extendable-level inverter

THD Reduction of Improved Single Source MLI Using Upgraded Black Widow Optimization Algorithm

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