An Open-End Winding Motor Approach to Mitigate the Phase Voltage Distortion on Multilevel Inverters

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

doi:10.1109/tpel.2017.2695244

Cited by 51 publications

(19 citation statements)

References 44 publications

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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%

“…The phase voltage V mi takes the zero level and further 4(n + 1) non-zero levels when V DC " = V DC /[2(n − 1)], while, some additional non zero levels become available if V DC " < V DC /[2(n − 1)] [31].…”

mentioning

confidence: 99%

“…The inverter power losses, consisting of the switching losses PswMLI, PswTLI and conduction losses PcMLI,234PcTLI were calculated as in[31]:…”

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confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Multi-Level Open End Windings Multi-Motor Drives

Foti

Testa

et al. 2019

Energies

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“…Different configurations, control schemes, and modulation techniques dealing with OW systems have been discussed in the literature [8][9][10]. Some OW configurations embedding multi-level converters have also been recently developed [11][12][13]. Among them, a high efficiency asymmetrical hybrid multilevel inverter for motor drives has been presented and analyzed in [12] featuring a particular asymmetrical structure where two different kinds of converters are connected at the two sides of an OW AC machine with different functions.…”

Section: Introductionmentioning

confidence: 99%

“…Some OW configurations embedding multi-level converters have also been recently developed [11][12][13]. Among them, a high efficiency asymmetrical hybrid multilevel inverter for motor drives has been presented and analyzed in [12] featuring a particular asymmetrical structure where two different kinds of converters are connected at the two sides of an OW AC machine with different functions. Specifically, a main multilevel converter supplies the load, and an auxiliary two-level inverter acts as machine with different functions.…”

Section: Introductionmentioning

confidence: 99%

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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Hybrid space‐vector pulse width modulation strategies for a four‐level open‐end winding induction motor drive with an improvised harmonic performance and balanced DC ‐link capacitors

Lakhimsetty

Kumar

Somasekhar

2021

Int Trans Electr Energ Syst

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Summary The four‐level open‐end winding induction motor (4‐L OEWIM) drive is constituted by two 2‐level voltage source inverters (VSIs), wherein their DC‐link voltages should be maintained in the ratio of 2:1. Owing to the unsymmetrical structure of the power circuit, the 4‐L OEWIM drive is plagued with the drawback of capacitor voltage imbalance. The DC‐link capacitor of one of the inverters, which is operated with the lower voltage level, that show the propensity of getting charged up by its higher voltage counterpart, belonging to the other inverter. In this article, two variants of space‐vector pulse width modulation (SVPWM) schemes are suggested for the 4‐L OEWIM drive. The suggested sample based SVPWM techniques achieve the voltage balancing of the DC‐link capacitors, while improving the harmonic performance of the drive. Specifically, one of the two proposed PWM schemes manages to clamp one of the inverters in every sampling time interval. Hence this scheme results in lowering the total harmonic distortion (THD) in the no‐load current in most of the operating range of the drive, resulting in lower ripple in the motor phase current, lower ohmic loss and reduced torque ripple. The performances of the proposed PWM techniques are assessed with the aid of simulation studies and are validated with the experimentation.

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An Open-End Winding Motor Approach to Mitigate the Phase Voltage Distortion on Multilevel Inverters

Cited by 51 publications

References 44 publications

Multi-Level Open End Windings Multi-Motor Drives

Multi-Level Open End Windings Multi-Motor Drives

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

Hybrid space‐vector pulse width modulation strategies for a four‐level open‐end winding induction motor drive with an improvised harmonic performance and balanced DC ‐link capacitors

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