Current balance control in a multilevel current source inverter

Aguirre, Miguel Pablo; Engelhardt, Mathias Angélico; Bracco, Jose Maria; Valla, M.I.

doi:10.1109/icit.2013.6505906

Cited by 9 publications

(13 citation statements)

References 10 publications

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“…However in case of trapezoidal based modulation which is explained in Section III-A3, the tri-logic conversion are not required as the comparison of carrier with trapezoidal directly produces gating pulses to operate current-fed MLCs [43]. From the literature it has been found that current fed MLCs are mostly modulated with carrier phase shifted modulation technique as in [26], [37], [57], [72]- [74]. To operate L-level converter, it requires (L − 1)/2 carrier waveforms.…”

Section: B Multi-carrier Sinusoidal Pwmmentioning

confidence: 99%

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Kulothungan

Rathore

Edpuganti

et al. 2017

IEEE Trans. Power Electron.

100

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Multilevel converters (MLC) have emerged as standard power electronic converters in high power as well as quality demanding applications. They are classified into current-fed MLC and voltage-fed MLC. Voltage-fed MLC has widely researched whereas the current-fed MLC are the recent topic of research. Based on the principle of duality between voltage and current sources, several current-fed MLCs analogous to voltage-fed MLCs have been identified. Current-fed MLC offer several advantages in terms of high power capability, transformer-less operation, short circuit protection and excellent quality of output current waveform. The goal of this paper is (1) to present review of circuit topologies, modulation schemes and applications of current-fed MLCs and, (2) to propose an emerging low device switching frequency modulation technique known as synchronous optimal pulsewidth modulation for current-fed MLCs. The circuit configuration and advantages of each topology along with various modulation techniques are discussed in detail. Compared to voltage-fed MLCs, the operation of current-fed MLCs need to satisfy additional switching constraints. Classical methods for realization these operational constraints are surveyed and new generic method has been proposed. Finally future scope of research has been presented to encourage further development of topologies and modulation techniques for current-fed MLCs.

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Section: B Multi-carrier Sinusoidal Pwmmentioning

confidence: 99%

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Kulothungan

Rathore

Edpuganti

et al. 2017

IEEE Trans. Power Electron.

100

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“…Relying on the duality principle [8], most topologies require the DC input to be a constant current source. In most cases, either a DC voltage source connected to a large smoothing inductor [9,10] or a current-controlled buck converter [11][12][13][14] is used as a constant current source. The most common three-phase MCSI is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…The most common three-phase MCSI is shown in Figure 1. It was first introduced by Xiong et al [9] and has been the subject of several papers over the past few years [10][11][12][13][14]. In addition to a current-controlled buck converter or a large smoothing inductor at the input, this topology consists of M modules, for a 2M + 1 level converter.…”

Section: Introductionmentioning

confidence: 99%

“…Disturbances and small differences in the electrical parameters between the modules can easily lead different inductors to have different average currents [11], and modules sustaining currents higher than their rated current could be damaged. The current imbalance problem is highlighted in [12]. Using the same modulation technique as that used in [11], the authors suggested two Proportional-Integral (PI) controllers-based solutions to ensure a current-balanced operation for the seven-level case.…”

Section: Introductionmentioning

confidence: 99%

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Current Balancing Algorithm for Three-Phase Multilevel Current Source Inverters

Alskran

Simões

2020

Energies

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In high power, medium voltage applications, Current Source Inverters CSIs are connected in parallel to accommodate high DC currents. Using a proper multilevel modulation technique, parallel-connected CSIs can operate as a Multilevel CSI (MCSI). The most common modulation technique for MCSIs is the Phase-Shifted Carrier SPWM (PSC-SPWM). The proper operation of the MCSI requires each CSI modules to have the same average current flowing through its sharing inductors. In practice, the average currents of the CSI modules deviate from their nominal values. Therefore, current balancing mechanisms must be implemented. In the literature, several solutions have been proposed to tackle the current imbalance problem. Most of these solutions are based on altering the phase-shift or magnitude of the carrier waveforms of the PSC-SPWM. They require dedicated PI controllers and they are applicable to MCSIs with specific numbers of levels. This paper proposes a Current Balancing Algorithm (CBA) that can be implemented in any MCSI with any number of levels. The proposed CBA does not require any PI controllers, nor does it require any alteration to the PWM carrier waveforms. The CBA is implemented using a modified Level-Shifted SPWM (LS-PWM). The modified LS-SPWM is shown to produce lower THD and lower di/dt when compared to the PSC-SPWM. The CBA and modified LS-SPWM where implemented in a proof-of-concept lab prototype. The experimental results are presented for the five-level and seven-level cases.

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“…Debido a que el balance de las corrientes internas producido por la modulación utilizada es débil y presenta error en régimen permanente, se han desarrollado dos métodos para controlar el valor medio de las corrientes internas del convertidor que, utilizando una mínima potencia de cálculo, permiten garantizar el balance interno frente a perturbaciones, dispersión en los valores de los componentes y diferencias en los tiempos de conmutación de las llaves (Aguirre et al, 2012a(Aguirre et al, , 2013c.…”

Section: Introductionunclassified

Convertidores multinivel de modo corriente tolerantes a fallas

Aguirre¹

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En esta tesis se realiza el estudio de los Convertidores Multinivel de Modo Corriente (MCSI), haciendo hincapié en la topología MCSI Simétrico o Single Rating Inductor MCSI por su especial característica modular que la hace ideal para aplicaciones industriales o de alta potencia. Se analiza en detalle el funcionamiento de la topología, incluyendo sus ventajas y desventajas en comparación con otras topologías de corriente y con los Convertidores Multinivel de Modo Tensión (MVSI). Se presenta el diseño de los circuitos y la estrategia de funcionamiento para conseguir un funcionamiento tolerante a fallas, mediante el agregado de un módulo de respaldo o hotspare. Se propone y analiza una la generación de las señales de disparo mediante una adaptación de la modulación de ancho de pulso por desplazamiento de portadoras (PSC-SPWM) y se demuestra que su uso genera un balance natural en las corrientes internas del convertidor. Se presentan dos técnicas de control para fortalecer el balance de corrientes frente a perturbaciones, que actúan sobre la modulación,con mínimos requerimientos de potencia de cálculo. Dado que los MCSI Simétricos son ideales para su uso en aplicaciones de alta potencia, se diseñan dos técnicas tendientes a minimizar las pérdidas en las llaves, reduciendo la cantidad de conmutaciones por ciclo y produciendo una conmutación suave de la corriente. Se demuestra, mediante simulaciones detalladas, el correcto funcionamiento de la topologí a en dos aplicaciones básica: a) como filtro activo para mejorar la calidad de los sistemas eléctricos, y b) como interfaz con sistemas de almacenamiento en base a hidrógeno. Finalmente se presentan resultados experimentales en un prototipo de laboratorio, utilizando una FPGA de alta velocidad para la generación de las señales de disparo y control.

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Current balance control in a multilevel current source inverter

Cited by 9 publications

References 10 publications

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Current-Fed Multilevel Converters: An Overview of Circuit Topologies, Modulation Techniques, and Applications

Current Balancing Algorithm for Three-Phase Multilevel Current Source Inverters

Convertidores multinivel de modo corriente tolerantes a fallas

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