An Optimal Current Control Strategy for Asymmetrical Hybrid Multilevel Inverters

Foti, S.; De, S.; Scelba, G.; Scimone, T.; Testa, A.; Cacciato, M.; Scarcella, G.

doi:10.1109/tia.2018.2832024

Cited by 38 publications

(13 citation statements)

References 33 publications

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“…In the AHUTR topology, three bidirectional switches S ij , (i = a, b, c and j = 1, 2) are connected between the midpoint n of the Vienna rectifier and the rectifier poles [14]. The generic i-phase voltage V iTTR between the rectifier input terminal i M and the mid-point n" of the Vienna rectifier DC bus is given by…”

Section: Asymmetrical Hybrid Unidirectional T-type Rectifiermentioning

confidence: 99%

“…According to (2) and 3, the OW structure of Figure 1, featuring twelve power switches, is equivalent to a six-level neutral point clamped (NPC) or flying capacitor (FC) converter, which would, however, encompass thirty power switches [12]. As shown in Figure 2, the AHUTR requires a complex control system to suitably coordinate the operations of the two converters in order to regulate the DC output voltage, to cancel low-order harmonics from phase currents, to equalize the Vienna rectifier DC bus capacitor voltages, and to control the TLI DC bus voltage [14,15].…”

Section: Asymmetrical Hybrid Unidirectional T-type Rectifiermentioning

confidence: 99%

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An Averaged-Value Model of an Asymmetrical Hybrid Multi-Level Rectifier

et al. 2019

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The development and the validation of an averaged-value mathematical model of an asymmetrical hybrid multi-level rectifier is presented in this work. Such a rectifier is composed of a three-level T-type unidirectional rectifier and of a two-level inverter connected to an open-end winding electrical machine. The T-type rectifier, which supplies the load, operates at quite a low switching frequency in order to minimize inverter power losses. The two-level inverter is instead driven by a standard sinusoidal pulse width modulation (SPWM) technique to suitably shape the input current. The two-level inverter also plays a key role in actively balancing the voltage across the DC bus capacitors of the T-type rectifier, making unnecessary additional circuits. Such an asymmetrical structure achieves a higher efficiency compared to conventional PWM multilevel rectifiers, even considering extra power losses due to the auxiliary inverter. In spite of its advantageous features, the asymmetrical hybrid multi-level rectifier topology is a quite complex system, which requires suitable mathematical tools for control and optimization purposes. This paper intends to be a step in this direction by deriving an averaged-value mathematical model of the whole system, which is validated through comparison with other modeling approaches and experimental results. The paper is mainly focused on applications in the field of electrical power generation; however, the converter structure can be also exploited in a variety of grid-connected applications by replacing the generator with a transformer featuring an open-end secondary winding arrangement.

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Section: Asymmetrical Hybrid Unidirectional T-type Rectifiermentioning

confidence: 99%

Section: Asymmetrical Hybrid Unidirectional T-type Rectifiermentioning

confidence: 99%

An Averaged-Value Model of an Asymmetrical Hybrid Multi-Level Rectifier

et al. 2019

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“…Moreover, the main inverter operates at the fundamental frequency in order to achieve low switching power losses, while the active filter is PWM operated. Finally, the DC bus voltage of the two-level inverter is remarkably lower than that of the main inverter [30][31][32][33][34][35][36]. The proposed MMD OW configuration features a higher global efficiency and lower current THD than an equivalent PWM operated multi-level inverter for multi-motor drives [37], exploiting a specific control strategy combining low switching frequency modulation on the MLI and high frequency PWM on the TLI.…”

Section: Introductionmentioning

confidence: 99%

“…In practice, power devices and motors power losses in the TLI would cause a progressive discharge of the floating capacitor of the TLI DC-bus. Being floating, such a capacitor can only be charged by diverting to it a small quantity of the active power delivered by the MLI to the motors [32][33][34][35][36][37][38][39][40][41][42][43][44]. As shown in the control scheme of Figure 6, this is achieved by slightly modifying the TLI reference voltages.…”

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confidence: 99%

Multi-Level Open End Windings Multi-Motor Drives

Foti

Testa

et al. 2019

Energies

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A multi-level open-end winding converter topology for multiple-motor drives is presented featuring a main multi-level inverter processing the power delivered to the motors and an active filter based on an auxiliary two-level inverter. The main inverter operates at the fundamental frequency in order to achieve low switching power losses, while the active filter is Pulse Width Modulation (PWM) operated to suitably shape the motor currents. The proposed configuration features less phase current distortion than conventional multi-level inverters operating at the fundamental frequency, while achieving a higher efficiency compared to PWM multi-level inverters. Experimental results confirm the effectiveness of such a configuration on both multiple motors-single converter and multiple motor-multiple converter drives.

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“…The steady state and transient performance of two-phase induction motor drive are investigated in [6]. The asymmetric multilevel inverter are developed with a main level inverter and auxiliary inverter and both are operated with two different frequencies and supplied by two independent sources [7]. The voltage controller for drive is designed with PI controller, which improves the system efficiency [8].…”

Section: Introductionmentioning

confidence: 99%

Induction Motor Drive with Trinary DC Source Asymmetrical Inverter

Vijayakumar¹,

Prabaharan²

2019

IJRTE

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This paper deals a comparison of MATLAB based simulation of sinusoidal and trapezoidal PWM strategies applied to a trinary DC source nine level inverter fed R -load. The nine-level inverter fed induction motor drive is simulated only for that reference which provides better performance with R-load. Open loop and PI control schemes have also been developed for trinary DC source fed nine level inverter-based Induction motor drive to improve the responses under various sudden load changesat specified reference speed. The corresponding speed, torque and stator voltage are presented. Usual performance indices for transient operation of above drive are also evaluated and presented.

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An Optimal Current Control Strategy for Asymmetrical Hybrid Multilevel Inverters

Cited by 38 publications

References 33 publications

An Averaged-Value Model of an Asymmetrical Hybrid Multi-Level Rectifier

An Averaged-Value Model of an Asymmetrical Hybrid Multi-Level Rectifier

Multi-Level Open End Windings Multi-Motor Drives

Induction Motor Drive with Trinary DC Source Asymmetrical Inverter

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