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The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sun, 10 Dec 2023 14:58:05 GMT2023-12-10T14:58:05ZAdaline-Based Control Schemes for Non-Sinusoidal Multiphase Drives—Part II: Torque Optimization for Faulty Mode
http://hdl.handle.net/10985/21458
Adaline-Based Control Schemes for Non-Sinusoidal Multiphase Drives—Part II: Torque Optimization for Faulty Mode
VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric; WU, Hailong
Fault tolerance has been known as one of the main advantages of multiphase drives. When an open-circuit fault happens, smooth torque can be obtained without any additional hardware. However, a reconfiguration strategy is required to determine new reference currents. Despite advantages of non-sinusoidal electromotive forces (NS-EMFs) such as high torque density, multi-harmonics existing in NS-EMFs cause more challenges for control, especially under faulty conditions. Therefore, to guarantee high-quality vector control of multiphase drives with multi-harmonic NS-EMFs, this two-part study proposes control schemes using adaptive linear neurons (Adalines) to adaptively eliminate torque ripples. The proposed simple Adalines are efficient because of taking advantage of the knowledge of rotor position and of torque harmonic rank induced by the NS-EMFs. The control scheme using an Adaline for healthy mode was described in part I of this study. In this second part, the control scheme using another Adaline for an open-circuit operation, under the impacts of multi-harmonics in NS-EMFs, is proposed. Notably, smooth torque and similar copper losses in the remaining healthy phases can be obtained. Experimental tests are carried out on a seven-phase permanent magnet synchronous machine (PMSM) with a high total harmonic distortion (THD = 38%) of NS-EMFs. A demonstration video is provided with this paper.
Fri, 01 Jan 2021 00:00:00 GMThttp://hdl.handle.net/10985/214582021-01-01T00:00:00ZVU, Duc TanNGUYEN, Ngac KySEMAIL, EricWU, HailongFault tolerance has been known as one of the main advantages of multiphase drives. When an open-circuit fault happens, smooth torque can be obtained without any additional hardware. However, a reconfiguration strategy is required to determine new reference currents. Despite advantages of non-sinusoidal electromotive forces (NS-EMFs) such as high torque density, multi-harmonics existing in NS-EMFs cause more challenges for control, especially under faulty conditions. Therefore, to guarantee high-quality vector control of multiphase drives with multi-harmonic NS-EMFs, this two-part study proposes control schemes using adaptive linear neurons (Adalines) to adaptively eliminate torque ripples. The proposed simple Adalines are efficient because of taking advantage of the knowledge of rotor position and of torque harmonic rank induced by the NS-EMFs. The control scheme using an Adaline for healthy mode was described in part I of this study. In this second part, the control scheme using another Adaline for an open-circuit operation, under the impacts of multi-harmonics in NS-EMFs, is proposed. Notably, smooth torque and similar copper losses in the remaining healthy phases can be obtained. Experimental tests are carried out on a seven-phase permanent magnet synchronous machine (PMSM) with a high total harmonic distortion (THD = 38%) of NS-EMFs. A demonstration video is provided with this paper.Sensitivity of Torque Control for Seven-phase BLDC Machine with One Opened Phase under Constraints on Voltage and Current
http://hdl.handle.net/10985/13807
Sensitivity of Torque Control for Seven-phase BLDC Machine with One Opened Phase under Constraints on Voltage and Current
VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric
This paper deals with control strategies when a sevenphase axial-flux brushless DC machine operates in one opencircuited phase fault by considering constraints on voltage and current. The constraints are related to the converter and machine design in terms of peak values of non-sinusoidal voltage and current. In addition, the sensitivity of the torque control on parameters of new imposed current references under the base speed and in the flux-weakening region is analyzed. The current references taking into account only first and third harmonics in healthy phases are proposed to ensure the torque optimization while phase currents and voltages are within their limits. The usefulness of the control strategies and the parameter analyses are verified by numerical results.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/138072018-01-01T00:00:00ZVU, Duc TanNGUYEN, Ngac KySEMAIL, EricThis paper deals with control strategies when a sevenphase axial-flux brushless DC machine operates in one opencircuited phase fault by considering constraints on voltage and current. The constraints are related to the converter and machine design in terms of peak values of non-sinusoidal voltage and current. In addition, the sensitivity of the torque control on parameters of new imposed current references under the base speed and in the flux-weakening region is analyzed. The current references taking into account only first and third harmonics in healthy phases are proposed to ensure the torque optimization while phase currents and voltages are within their limits. The usefulness of the control strategies and the parameter analyses are verified by numerical results.An Overview of Methods using Reduced-Ordered Transformation Matrices for Fault-Tolerant Control of 5-phase Machines with an Open Phase
http://hdl.handle.net/10985/15118
An Overview of Methods using Reduced-Ordered Transformation Matrices for Fault-Tolerant Control of 5-phase Machines with an Open Phase
VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric
This paper studies control strategies using modified transformation matrices when five-phase machines operate in oneopen-phase faults. The basic idea of these methods is to maintain the rotating field under asymmetrical conditions as the same as in healthy condition by determining new transformation matrices. The dimension of the new matrices is equal to the number of remaining healthy phases in post-fault conditions. There have been different ways to determine the new transformation matrices applied for different types of five-phase machines in recent decades. In this study, an overview and analyses on these methods will be presented. In addition, advantages and drawbacks of these control strategies are clarified by numerical results.
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/10985/151182019-01-01T00:00:00ZVU, Duc TanNGUYEN, Ngac KySEMAIL, EricThis paper studies control strategies using modified transformation matrices when five-phase machines operate in oneopen-phase faults. The basic idea of these methods is to maintain the rotating field under asymmetrical conditions as the same as in healthy condition by determining new transformation matrices. The dimension of the new matrices is equal to the number of remaining healthy phases in post-fault conditions. There have been different ways to determine the new transformation matrices applied for different types of five-phase machines in recent decades. In this study, an overview and analyses on these methods will be presented. In addition, advantages and drawbacks of these control strategies are clarified by numerical results.Current Harmonic Eliminations for Seven-Phase Non-sinusoidal PMSM Drives applying Artificial Neurons
http://hdl.handle.net/10985/22595
Current Harmonic Eliminations for Seven-Phase Non-sinusoidal PMSM Drives applying Artificial Neurons
VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric; NGUYEN, Thi Thanh Nga
This study is to deal with unwanted current harmonics in rotating (d-q) frames of a 7-phase non-sinusoidal permanent magnet synchronous machine (PMSM) in a wye-connected winding topology. The machine is supplied by a 7-leg volt-age source inverter (VSI). In control, currents in d-q frames are expected to properly track their time-constant references. However, unwanted harmonics of the non-sinusoidal back electromotive force (back-EMF) and the inverter non-linearity generate unwanted current harmonics in d-q frames. These current harmonics cannot be nullified by conventional proportional-integral (PI) con-trollers. In this study, a combination of PI controllers and adaptive linear neu-rons (ADALINEs) are proposed to eliminate these current harmonics after ana-lyzing their origins. The effectiveness of the proposed control structure is veri-fied by experimental results.
Sun, 01 Nov 2020 00:00:00 GMThttp://hdl.handle.net/10985/225952020-11-01T00:00:00ZVU, Duc TanNGUYEN, Ngac KySEMAIL, EricNGUYEN, Thi Thanh NgaThis study is to deal with unwanted current harmonics in rotating (d-q) frames of a 7-phase non-sinusoidal permanent magnet synchronous machine (PMSM) in a wye-connected winding topology. The machine is supplied by a 7-leg volt-age source inverter (VSI). In control, currents in d-q frames are expected to properly track their time-constant references. However, unwanted harmonics of the non-sinusoidal back electromotive force (back-EMF) and the inverter non-linearity generate unwanted current harmonics in d-q frames. These current harmonics cannot be nullified by conventional proportional-integral (PI) con-trollers. In this study, a combination of PI controllers and adaptive linear neu-rons (ADALINEs) are proposed to eliminate these current harmonics after ana-lyzing their origins. The effectiveness of the proposed control structure is veri-fied by experimental results.Torque Ripple Eliminations for Multiphase Nonsinusoidal Permanent Magnet Synchronous Machines
http://hdl.handle.net/10985/22616
Torque Ripple Eliminations for Multiphase Nonsinusoidal Permanent Magnet Synchronous Machines
VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric
This paper is to propose a control scheme, a combination of the classical field-oriented control (FOC) technique and artificial intelligence (AI), to obtain constant torques in multiphase non-sinusoidal permanent magnet synchronous machine (PMSM) drives. Higher torque density, easier fabrication, and lower costs are several advantages of non-sinusoidal back electromotive force (back-EMF) machines over sinusoidal ones. However, multi-harmonics existing in back-EMFs possibly generate torque ripples, reducing torque quality of the drive. Therefore, in this paper, an adaptive linear neuron (ADALINE), a simple type of AI, is combined with the classical FOC technique to eliminate these torque ripples. The proposed control scheme is validated by numerical results with a seven-phase PMSM. In addition, these results are compared with an existing strategy to prove its effectiveness.
Thu, 01 Apr 2021 00:00:00 GMThttp://hdl.handle.net/10985/226162021-04-01T00:00:00ZVU, Duc TanNGUYEN, Ngac KySEMAIL, EricThis paper is to propose a control scheme, a combination of the classical field-oriented control (FOC) technique and artificial intelligence (AI), to obtain constant torques in multiphase non-sinusoidal permanent magnet synchronous machine (PMSM) drives. Higher torque density, easier fabrication, and lower costs are several advantages of non-sinusoidal back electromotive force (back-EMF) machines over sinusoidal ones. However, multi-harmonics existing in back-EMFs possibly generate torque ripples, reducing torque quality of the drive. Therefore, in this paper, an adaptive linear neuron (ADALINE), a simple type of AI, is combined with the classical FOC technique to eliminate these torque ripples. The proposed control scheme is validated by numerical results with a seven-phase PMSM. In addition, these results are compared with an existing strategy to prove its effectiveness.Fault-Tolerant Control for Non-sinusoidal Seven-phase PMSMs with Similar Copper Losses
http://hdl.handle.net/10985/22615
Fault-Tolerant Control for Non-sinusoidal Seven-phase PMSMs with Similar Copper Losses
VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric; DO, Trung Hai
This paper proposes a strategy using new
transformation matrices to calculate new current references when
a non-sinusoidal seven-phase permanent magnet synchronous
machine (PMSM) has an open-circuited phase. The new current
references allow to obtain a smooth torque with similar copper
losses in the remaining healthy phases even when the back
electromotive force (back-EMF) is non-sinusoidal. A real-time
current learning process using an adaptive linear neural network
(Adaline) is applied to extract from measured currents useful
harmonic components in torque generation. It improves torque
quality, especially at high speed, even when standard
proportional-integral (PI) controllers are applied. In addition,
similar copper losses in the remaining phases with the new current
references can avoid overheating of windings. The effectiveness of
the proposed control strategy is validated by numerical results.
Fri, 01 Jul 2022 00:00:00 GMThttp://hdl.handle.net/10985/226152022-07-01T00:00:00ZVU, Duc TanNGUYEN, Ngac KySEMAIL, EricDO, Trung HaiThis paper proposes a strategy using new
transformation matrices to calculate new current references when
a non-sinusoidal seven-phase permanent magnet synchronous
machine (PMSM) has an open-circuited phase. The new current
references allow to obtain a smooth torque with similar copper
losses in the remaining healthy phases even when the back
electromotive force (back-EMF) is non-sinusoidal. A real-time
current learning process using an adaptive linear neural network
(Adaline) is applied to extract from measured currents useful
harmonic components in torque generation. It improves torque
quality, especially at high speed, even when standard
proportional-integral (PI) controllers are applied. In addition,
similar copper losses in the remaining phases with the new current
references can avoid overheating of windings. The effectiveness of
the proposed control strategy is validated by numerical results.Fault-tolerant Control for 7-phase Non-sinusoidal Permanent Magnet Machines with One Opened Phase
http://hdl.handle.net/10985/17208
Fault-tolerant Control for 7-phase Non-sinusoidal Permanent Magnet Machines with One Opened Phase
YANAGIHARA, Keitaro; VU, Duc Tan; NGUYEN, Ngac Ky; GONG, Jinlin; SEMAIL, Eric; DOS SANTOS MORAES, Tiago José
This paper presents new fault-tolerant control strategies for field-oriented control of 7-phase non-sinusoidal permanent magnet (PM) machines supplied by voltage source inverters (VSI). Single phase open-circuit fault is considered. The proposed strategies aim at finding waveforms of current references in natural frame in the way that post-fault currents create the same rotational magnetomotive force (MMF) as in healthy mode. Therefore, in the faulty mode, average torque can be maintained if no current limits are set. The proposed strategies are validated and compared to a previous strategy by numerical results in terms of joule losses, maximum RMS and peak phase currents, maximum phase voltage as well as their controllability with PI controllers.
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/10985/172082019-01-01T00:00:00ZYANAGIHARA, KeitaroVU, Duc TanNGUYEN, Ngac KyGONG, JinlinSEMAIL, EricDOS SANTOS MORAES, Tiago JoséThis paper presents new fault-tolerant control strategies for field-oriented control of 7-phase non-sinusoidal permanent magnet (PM) machines supplied by voltage source inverters (VSI). Single phase open-circuit fault is considered. The proposed strategies aim at finding waveforms of current references in natural frame in the way that post-fault currents create the same rotational magnetomotive force (MMF) as in healthy mode. Therefore, in the faulty mode, average torque can be maintained if no current limits are set. The proposed strategies are validated and compared to a previous strategy by numerical results in terms of joule losses, maximum RMS and peak phase currents, maximum phase voltage as well as their controllability with PI controllers.Torque Optimization of a Seven-Phase Bi-harmonic PMSM in Healthy and Degraded Mode
http://hdl.handle.net/10985/16155
Torque Optimization of a Seven-Phase Bi-harmonic PMSM in Healthy and Degraded Mode
ZHANG, Hao; ZHAO, Benteng; GONG, Jinlin; XU, Yanliang; VU, Duc Tan; NGUYEN, Ngac Ky; SEMAIL, Eric; DOS SANTOS MORAES, Tiago José
Compared to sinusoidal machines, a bi-harmonic machine (with only two harmonics of similar value in the electromotive force spectrum) can develop torque of comparable values under three kinds of supply: with only first or both first and third sinusoidal currents. Therefore, more degrees of freedom for the control of the machine can be achieved. In this paper, the specificities of a 7-phase bi-harmonic permanent magnet synchronous machine (PMSM) are investigated under different control strategies, such as maximum torque per ampere (MTPA) at low speed and fluxweakening strategies at high speed, both in healthy and faulty operation modes. The fault with one open-circuited phase are taken into account. The current references are calculated in order to maximize the output torque under the constraint on both voltage and current. The performances of the considered machine is validated by numerical results.
Tue, 01 Jan 2019 00:00:00 GMThttp://hdl.handle.net/10985/161552019-01-01T00:00:00ZZHANG, HaoZHAO, BentengGONG, JinlinXU, YanliangVU, Duc TanNGUYEN, Ngac KySEMAIL, EricDOS SANTOS MORAES, Tiago JoséCompared to sinusoidal machines, a bi-harmonic machine (with only two harmonics of similar value in the electromotive force spectrum) can develop torque of comparable values under three kinds of supply: with only first or both first and third sinusoidal currents. Therefore, more degrees of freedom for the control of the machine can be achieved. In this paper, the specificities of a 7-phase bi-harmonic permanent magnet synchronous machine (PMSM) are investigated under different control strategies, such as maximum torque per ampere (MTPA) at low speed and fluxweakening strategies at high speed, both in healthy and faulty operation modes. The fault with one open-circuited phase are taken into account. The current references are calculated in order to maximize the output torque under the constraint on both voltage and current. The performances of the considered machine is validated by numerical results.Current Harmonic Eliminations for Seven-Phase Non-sinusoidal PMSM Drives applying Artificial Neurons
http://hdl.handle.net/10985/19666
Current Harmonic Eliminations for Seven-Phase Non-sinusoidal PMSM Drives applying Artificial Neurons
VU, Duc Tan; NGUYEN, Ngac-Ky; SEMAIL, Eric; NGUYEN, Thi Thanh Nga
This study is to deal with unwanted current harmonics in rotating (d-q) frames of a 7-phase non-sinusoidal permanent magnet synchronous machine (PMSM) in a wye-connected winding topology. The machine is supplied by a 7-leg voltage source inverter (VSI) fed by a DC-bus voltage. In control, current responses are expected to properly track their references. However, several unwanted harmonics of the non-sinusoidal back electromotive force (back-EMF) and the inverter nonlinearity generate unwanted harmonic components in d-q currents. These current harmonics cannot be nullified by controllers such as conventional proportional-integral (PI) controllers. Consequently, the current responses cannot track their references. In this study, a combination of conventional PI controllers and simple adaptive linear neurons (ADALINEs) is proposed to eliminate these current harmonics, improving current control quality of the drive. The effectiveness of the proposed control structure is verified by experimental results.
Wed, 01 Jan 2020 00:00:00 GMThttp://hdl.handle.net/10985/196662020-01-01T00:00:00ZVU, Duc TanNGUYEN, Ngac-KySEMAIL, EricNGUYEN, Thi Thanh NgaThis study is to deal with unwanted current harmonics in rotating (d-q) frames of a 7-phase non-sinusoidal permanent magnet synchronous machine (PMSM) in a wye-connected winding topology. The machine is supplied by a 7-leg voltage source inverter (VSI) fed by a DC-bus voltage. In control, current responses are expected to properly track their references. However, several unwanted harmonics of the non-sinusoidal back electromotive force (back-EMF) and the inverter nonlinearity generate unwanted harmonic components in d-q currents. These current harmonics cannot be nullified by controllers such as conventional proportional-integral (PI) controllers. Consequently, the current responses cannot track their references. In this study, a combination of conventional PI controllers and simple adaptive linear neurons (ADALINEs) is proposed to eliminate these current harmonics, improving current control quality of the drive. The effectiveness of the proposed control structure is verified by experimental results.Enhancement of Sensorless Control for Non-Sinusoidal Multiphase Drives-Part I: Operation in Medium and High-Speed Range
http://hdl.handle.net/10985/21462
Enhancement of Sensorless Control for Non-Sinusoidal Multiphase Drives-Part I: Operation in Medium and High-Speed Range
MINI, Youssouf; NGUYEN, Ngac Ky; SEMAIL, Eric; VU, Duc Tan
This two-part study proposes a new sensorless control strategy for non-sinusoidal multiphase permanent magnet synchronous machines (PMSMs), especially integrated motor drives (IMDs). Based on the Sliding Mode Observer (SMO), the proposed sensorless control strategy uses the signals (currents and voltages) of all fictitious machines of the multiphase PMSMs. It can estimate the high-accuracy rotor positions that are required in vector control. This proposed strategy is compared to the conventional sensorless control strategy that applies only current and voltage signals of the main fictitious machine, including the fundamental component of back electromotive force (back EMF) of non-sinusoidal multiphase PMSMs. Therefore, in order to choose an appropriate sensorless control strategy for the non-sinusoidal multiphase PMSMs, these two sensorless control strategies will be highlighted in terms of precision with respect to rotor position and speed estimation. Simulations and the experimental results obtained with a non-sinusoidal seven-phase PMSM will be shown to verify and compare the two sensorless control strategies. In this part of the study (part I), only sensorless control in the medium and high-speed range is considered. Sensorless control at the zero and low-speed range will be treated in the second part of this study (part II).
Sat, 01 Jan 2022 00:00:00 GMThttp://hdl.handle.net/10985/214622022-01-01T00:00:00ZMINI, YoussoufNGUYEN, Ngac KySEMAIL, EricVU, Duc TanThis two-part study proposes a new sensorless control strategy for non-sinusoidal multiphase permanent magnet synchronous machines (PMSMs), especially integrated motor drives (IMDs). Based on the Sliding Mode Observer (SMO), the proposed sensorless control strategy uses the signals (currents and voltages) of all fictitious machines of the multiphase PMSMs. It can estimate the high-accuracy rotor positions that are required in vector control. This proposed strategy is compared to the conventional sensorless control strategy that applies only current and voltage signals of the main fictitious machine, including the fundamental component of back electromotive force (back EMF) of non-sinusoidal multiphase PMSMs. Therefore, in order to choose an appropriate sensorless control strategy for the non-sinusoidal multiphase PMSMs, these two sensorless control strategies will be highlighted in terms of precision with respect to rotor position and speed estimation. Simulations and the experimental results obtained with a non-sinusoidal seven-phase PMSM will be shown to verify and compare the two sensorless control strategies. In this part of the study (part I), only sensorless control in the medium and high-speed range is considered. Sensorless control at the zero and low-speed range will be treated in the second part of this study (part II).