The zero-sequence parameters and performance of three-phase induction motors

<p class="Abstract">This paper presents the results of a study about the effects of unbalanced voltages on the energy performance of three-phase induction motors. The principal contribution of this paper is that presents a detailed analysis of the influence of positive and negative sequence voltage components and the angle between them on several characteristics such as: line currents, losses, efficiency and power factor under different voltage unbalanced conditions. A three-phase induction motor of 3 HP was used as a case study. The results of the investigation show that the positive sequence voltage must be considered together with the voltage unbalance factor (VUF) or percent voltage unbalance (PVU) index to evaluate the performance of the induction motor. It is also shown that the behavior of the motor load influences on the positive sequence parameters next to the voltage, while in the case of negative sequence only influences the negative sequence voltage.</p>

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On Efficiency and Performance Improvement of Three-Phase Induction Motors in Refrigeration and HVAC Applications

2021 IEEE Green Technologies Conference (GreenTech) ◽

10.1109/greentech48523.2021.00097 ◽

2021 ◽

Author(s):

Olusegun Solomon ◽

Parviz Famouri

Keyword(s):

Performance Improvement ◽

Induction Motors ◽

Three Phase ◽

And Performance

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An adaptive, observer-based switching method for B4 inverters feeding three-phase induction motors

International Journal of Emerging Electric Power Systems ◽

10.1515/ijeeps-2021-0061 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Hossein Valiyan Holagh ◽

Tooraj Abbasian Najafabadi ◽

Hossein Safamehr

Keyword(s):

Induction Motors ◽

Fault Tolerant ◽

Induction Machines ◽

Adaptive Observer ◽

Three Phase ◽

Simulation Results ◽

And Performance ◽

Switching Method ◽

Torque Ripples ◽

Selection Of

Abstract A four-switch inverter called the B4 inverter is a reconfigured topology of a B6 inverter, one leg of which is damaged. The four-switch topology provides the overall system with fault-tolerant characteristics. However, this reconfiguration will not only change the system dynamics but also degrade the system performance. For overcoming with these issues, this paper presents an adaptive switching method based on DC-link voltage control. In the proposed method, the selection of active vectors and the calculation of switching times are made according to an adaptive, observer-based algorithm which will reduce DC-link voltage oscillations and adjust unbalanced currents fed to induction machines. In this algorithm, an online, designed observer is utilized so as to estimate the DC amount of the DC-link voltage. Applying this method, we will decrease flux and torque ripples as well as increase the inverter efficiency and performance. The simulation results presented in the MATLAB environment evaluate and validate the performance and effectiveness of this approach.

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