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Journal ArticleDOI

An Asymmetric Nine-Phase Induction Motor for LCI-Fed Medium Voltage Drive Applications

01 May 2020-IEEE Transactions on Power Electronics (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 35, Iss: 5, pp 5047-5056
TL;DR: A new asymmetric nine-phase induction motor-based load commutated inverter (LCI)-fed drive configuration is presented as an alternative to the popular LCI-based synchronous motor drive topology in medium voltage (MV), high power applications.
Abstract: This article presents a new asymmetric nine-phase induction motor-based load commutated inverter (LCI)-fed drive configuration as an alternative to the popular LCI-based synchronous motor drive topology in medium voltage (MV), high power applications. The proposed machine has three sets of three phase windings, two of which are designed to carry the rated active power from the LCI at MV levels. The other three phase winding is designed to handle all the reactive power requirement of the machine at a standard low voltage level from an insulated gate bipolar transistor (IGBT)-based voltage source inverter (VSI). The VSI also assists the LCI operation by supplying some additional reactive power required for safe commutation of the thyristors of the LCI. A smooth torque profile is also ensured by using the VSI to cancel out the low frequency harmonics in the quasi-square-shaped LCI currents. A laboratory prototype of the machine rated 75 kW, 1650/1650/400 V is designed and built to verify the proposed drive and the experimental results obtained are presented in this article.
Citations
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Journal ArticleDOI
TL;DR: A new topology of a silicon controlled rectifier (SCR) based current source inverter (CSI) fed induction motor drive suitable for medium voltage (MV) drive applications is presented in this article.
Abstract: A new topology of a silicon controlled rectifier (SCR) based current source inverter (CSI) fed induction motor drive suitable for medium voltage (MV) drive applications is presented in this article. The requirement of forced commutation circuitry has been the major disadvantage of an SCR-based CSI-fed induction motor drive. The proposed drive uses an induction motor provided with an auxiliary isolated low voltage winding on the stator. The SCR converter is connected to the main winding of the motor rated for MV levels. A voltage source inverter (VSI) of a small rating connected to the auxiliary winding injects a required voltage to ensure safe commutation of the SCR inverter. This enables the drive to operate over the entire speed range without requiring additional external commutation circuitry. The VSI also compensates the low frequency torque harmonics due to the quasi-square wave CSI currents thereby ensuring a low ripple torque profile. The proposed drive is experimentally verified using a 37.5 kW, 1.65 kV laboratory prototype with a 400 V auxiliary winding.

6 citations


Additional excerpts

  • ...windings for 12-pulse LCI operation is also reported in [20]....

    [...]

Journal ArticleDOI
TL;DR: It is shown in this article that the leakage inductances play a pivotal role in determining the ratings of the low-voltage windings and the VSI, and an iterative design procedure to obtain the correct ratings for the flux winding and theLowvoltage components is proposed.
Abstract: The active–reactive induction motor (ARIM) has been introduced in the literature as a low-cost and high-efficiency alternative to the synchronous motor in load commutated inverter (LCI) fed drives. ARIM is a squirrel cage machine with two sets of dissimilar three-phase stator windings. While one winding is rated for high voltage and power, the other winding is rated for a lower voltage and power. The low-voltage winding fed from a voltage source inverter (VSI) supplies only reactive power to the machine such that a leading power factor appears at the high-voltage terminals, enabling LCI-fed operation at this winding. Since the ARIM is fundamentally an induction motor, the conventional induction machine design process is applicable. However, due to the nonconventional arrangement of stator windings and being intended specifically for an LCI-fed topology, this new class of induction machines requires some critical design considerations. It is shown in this article that the leakage inductances play a pivotal role in determining the ratings of the low-voltage windings and the VSI. Therefore, an iterative design procedure to obtain the correct ratings for the flux winding and the low-voltage components is proposed. It is also required to know the correct value of the leakage inductance in order to design the control loops for reliable operation. This article proposes experimental methods to determine these leakage inductances. The proposed methods are validated by designing a 3.3-kV, 75-kW prototype and experimental results are presented.

4 citations


Cites background from "An Asymmetric Nine-Phase Induction ..."

  • ...Therefore, for a chosen value of specific electrical loading in the design, the ARIM has a slightly larger size compared to the induction motor [15]....

    [...]

  • ...Two new variants of the LCI-based ARIM drive, one with a tapped stator winding for higher efficiency and lower cost and size [15] and another with a split phase winding for reduced torque ripple and VSI rating, [16] have also been recently reported....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a new technique to overcome the low torque capability of an LCI-fed active-reactive induction motor (ARIM) drive, which is a dual-stator induction machine reported in literature, with one winding rated for high voltage and the other rated for low voltage.
Abstract: Load commutated inverter (LCI)-based drives are quite popular in high-power, medium-voltage (MV) applications. However, the limited torque capability during starting and low-speed operation is a major drawback of these drives. This is due to the small back electromotive force (EMF) in the drive motor at low speeds, which is usually insufficient to commutate the silicon-controlled rectifiers in the LCI. A new technique to overcome this drawback for an LCI-fed active-reactive induction motor (ARIM) drive is proposed in this article. The ARIM is a dual-stator induction machine reported in literature, with one winding rated for MV and the other rated for low voltage (LV). The MV winding is fed with active power from the LCI, while the LV winding is supplied with reactive power from a lower rated LV voltage source inverter (VSI). In the proposed method, the VSI is used to apply a preselected voltage vector for a short time during each turn- off instant, such that a commutation voltage of sufficient magnitude is induced in the MV winding, providing safe commutation irrespective of the magnitude of the back EMF. Thus, the drawback of the low torque capability at starting and low speeds is overcome in the proposed method, which is also experimentally validated using a 75-kW, 3.3-kV prototype.

2 citations

Proceedings ArticleDOI
09 Oct 2022
TL;DR: In this article , a fault tolerance and on-the-fly re-connection algorithm for an LCI and VSI fed multi-phase induction machine drive is proposed, which offers continuous operation of the drive with half the rated power.
Abstract: The fault tolerant operation of the drive is a critical requirement in medium voltage high power applications. In these drives, at an event of converter failure, a continuous operation with reduced power rating is preferred over a complete shutdown of the system. Hence, multi-phase machines are widely used for such applications since they offer inherent fault tolerance operation. This paper proposes a new fault tolerance and on-the-fly re-connection algorithm for an LCI and VSI fed multi-phase induction machine drive. The proposed method offers continuous operation of the drive with half the rated power when an LCI is faulty. The proposed algorithm is experimentally validated on a 75 kW multi-phase induction machine drive and the results are presented.

1 citations

Journal ArticleDOI
01 Mar 2021
TL;DR: In this paper, a nine phase electric vehicle inverter is designed for the electric vehicle drive system and compared with a sinusoidal pulse width modulation and space vector modulation technique is made based on the quality of power output.
Abstract: Multiphase machines have many advantages such as smoother toque and low stator current at each phase without increasing the stator voltage per phase and are mainly used in industrial applications. By implementing nine phase drive system the stator current reduces at each phase, which neglects the use of high-cost bulky power harnessing equipment’s that are used in the conventional 3-phase electric vehicle drive system. In this article, a nine phase electric vehicle inverter is designed for the electric vehicle drive system. Choosing a pulse width modulation technique is the foremost criterion. In this article sinusoidal pulse width modulation and space vector pulse width modulation technique is simulated and comparison is made based on the quality of power output. The simulation is modeled through Simulink software and the results are presented.

1 citations

References
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Journal ArticleDOI
TL;DR: An attempt is made to provide a brief review of the current state of the art in the area of variable-speed drives, addressing the reasons for potential use of multiphase rather than three-phase drives and the available approaches to multiphases machine designs.
Abstract: Although the concept of variable-speed drives, based on utilization of multiphase machines, dates back to the late 1960s, it was not until the mid- to late 1990s that multiphase drives became serious contenders for various applications. These include electric ship propulsion, locomotive traction, electric and hybrid electric vehicles, ldquomore-electricrdquo aircraft, and high-power industrial applications. As a consequence, there has been a substantial increase in the interest for such drive systems worldwide, resulting in a huge volume of work published during the last ten years. An attempt is made in this paper to provide a brief review of the current state of the art in the area. After addressing the reasons for potential use of multiphase rather than three-phase drives and the available approaches to multiphase machine designs, various control schemes are surveyed. This is followed by a discussion of the multiphase voltage source inverter control. Various possibilities for the use of additional degrees of freedom that exist in multiphase machines are further elaborated. Finally, multiphase machine applications in electric energy generation are addressed.

1,683 citations


"An Asymmetric Nine-Phase Induction ..." refers background in this paper

  • ...However both the windings in this machine have their axes aligned to each other unlike that in the usual asymmetric six-phase configuration [13]–[15] and hence it cannot claim the benefits of low torque ripple associated with these split-phase machines operated from LCI drives....

    [...]

Journal ArticleDOI
TL;DR: The importance of power electronics, the recent advances of power semiconductor devices, converters, variable-frequency AC drives, and advanced control and estimation techniques will be reviewed briefly.
Abstract: Power electronics technology has gone through dynamic evolution in the last four decades. Recently, its applications are fast expanding in industrial, commercial, residential, transportation, utility, aerospace, and military environments primarily due to reduction of cost, size, and improvement of performance. In the global industrial automation, energy conservation, and environmental pollution control trends of the 21st century, the widespread impact of power electronics is inevitable. It appears that the role of power electronics on our society in the future will tend to be as important and versatile as that of information technology today. In this paper, the importance of power electronics will be discussed after a brief historial introduction in the beginning. Then, the recent advances of power semiconductor devices, converters, variable-frequency AC drives, and advanced control and estimation techniques will be reviewed briefly. Unlike a traditional technology survey paper, the number of figures is kept intentionally small in favor of the text within the length constraint of this paper. The prognosis of different areas will be highlighted wherever possible based on the author's own knowledge and experience. In conclusion and future scenario, the trend of power electronics and motor drives along with some possible research and development areas will be highlighted.

401 citations

Journal ArticleDOI
TL;DR: This paper provides a comprehensive review of the state of the art of high-power converters (above 1 MW) for adjustable-speed ac drives and provides the latest technological advances and future trends in CSI- and CCV-fed large drives.
Abstract: This paper, along with an earlier published paper as Part 1, provides a comprehensive review of the state of the art of high-power converters (above 1 MW) for adjustable-speed ac drives. In this highly active area, different converter topologies have been developed for various drive applications in the industry. Due to its extensive coverage, the subject is divided into two parts: multilevel voltage source and current source converter topologies. This paper is focused on the second part and covers the current source converter technologies, including pulsewidth-modulated current-source inverters (CSIs) and load-commutated inverters. In addition, this paper also addresses the present status of the direct converter, which is also known as cycloconverter (CCV). This paper focuses on the latest CSI and CCV technologies and an overview of the commonly used modulation schemes. It also provides the latest technological advances and future trends in CSI- and CCV-fed large drives. This paper serves as a useful reference for academic researchers and practicing engineers in the field of power converters and adjustable-speed drives.

267 citations


"An Asymmetric Nine-Phase Induction ..." refers background in this paper

  • ...But in the very high power ranges (>20 MW), the conventional thyristor-based load commutated inverter (LCI)-fed drives are still the most prevalent [1]–[3]....

    [...]

Journal ArticleDOI
TL;DR: This paper jointly tackles the performance improvement of fundamental and secondary planes following a two-step procedure: individual virtual voltage vectors (VVs) first ensure low circulating currents and the optimal combination of two VVs provides enhanced current tracking in the fundamental plane.
Abstract: Finite-control set model predictive control (FCS-MPC) has been successfully applied to three-phase electric drives and has proven to bring fast dynamics and high flexibility. The extension of FCS-MPC to regulate machines with more than three phases (i.e., multiphase) presents, however, additional challenges. Leaving aside the higher computational requirements, the appearance of additional degrees of freedom requires a simultaneous current tracking in different subspaces. Hence, the accuracy in the fundamental plane needs to be accomplished with no simultaneous excitement of the secondary planes in order to avoid unacceptable inefficiencies. This paper jointly tackles the performance improvement of fundamental and secondary planes following a two-step procedure: individual virtual voltage vectors (VVs) first ensure low circulating currents and the optimal combination of two VVs provides enhanced current tracking in the fundamental plane. Comparative experimental results confirm the satisfactory performance of the proposed strategy.

79 citations


"An Asymmetric Nine-Phase Induction ..." refers background in this paper

  • ...Researchers have also explored several interesting VSI-fed split-phase configurations with advantages of smoother magneto motive force (MMF) profile, greater torque density and better reliability [19]–[21]....

    [...]

Journal ArticleDOI
TL;DR: The resultant hybrid inverter inherits certain operating advantages from both the constituent converters, which include reduced switching losses, improved quality of output current waveforms, and faster dynamic response to current control commands.
Abstract: A combination of a large current-source inverter and a small voltage-source inverter circuits is analyzed. The resultant hybrid inverter inherits certain operating advantages from both the constituent converters. In comparison with the popular voltage-source inverter, these advantages include reduced switching losses, improved quality of output current waveforms, and faster dynamic response to current control commands. Description of operating principles and characteristics of the hybrid inverter is illustrated with results of experimental investigation of a laboratory model.

77 citations