IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
This paper presents a novel seven-phase open-end winding drive system supplied by the dual non-sq... more This paper presents a novel seven-phase open-end winding drive system supplied by the dual non-square matrix converter. The input to each of the matrix converter is three phase utility grid system and the output is seven phase voltages with variable voltage and frequency. The two matrix converters feeding a seven-phase load are supplied from a common single three-phase utility source of 50 Hz. Space vector based PWM algorithm is developed to control the dual three to seven-phase matrix converter. The proposed control technique eliminates the common-mode voltage across the machine winding and hence no zero sequence currents will be produced and therefore no isolated supply is required for the dual three-to-seven phase matrix converter system. Further the proposed technique will enhance the seven phase machine phase voltage to 1.95 times the voltage produced by a single three to seven phase matrix converter system in the linear modulation range. The paper presents the analytical approach to obtain the expression of modulating signals that are used to generate the switching pulses for the matrix converter. Simulation results are presented to support the idea of the proposed modulation scheme.
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
This paper presents a novel topology for a dual three to n-phase direct matrix converter. The ter... more This paper presents a novel topology for a dual three to n-phase direct matrix converter. The term "n" can be used for any number of output phases. The dual matrix converter topology is applied for open-end winding drive system in order to enhance output voltage and simultaneously eliminate common-mode voltage at the machine terminals. The input to each of the matrix converter is three phase utility grid system, whereas the output can be configured to any number of phases with variable voltage and frequency. Generalized carrier based pulse width modulation (PWM) technique is developed to control the dual matrix converters. A dual three to nine-phase matrix converter is utilized for discussion and analysis. The two matrix converters feeding the nine-phase open-end load are supplied from a common single three-phase utility source of 50 Hz. A simple R-L load is considered in the paper. The paper presents an analytical approach to obtain the expression of modulating signals that are used to generate switching pulses for the matrix converter. Simulation and experimental results are presented to support the idea of the proposed modulation scheme.
IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society, 2011
Abstract The direct matrix converter (DMC) is an AC-to-AC direct power conversion topology based ... more Abstract The direct matrix converter (DMC) is an AC-to-AC direct power conversion topology based on controlled bi-directional switches that can generate variable output voltages and sinusoidal source currents with unity power factor. This basic module is used to study a multilevel converter which combines the characteristics of multi-cell topologies and direct power conversion, resulting a Cascaded Matrix Converter (CMC) based on 3× 2 direct matrix converter cells. This converter is fully regenerative, with stepped output voltage and ...
International Journal of Power Electronics and Drive Systems (IJPEDS), 2012
This paper develops discontinuous space vector PWM (DPWM) techniques for a five-phase two-level v... more This paper develops discontinuous space vector PWM (DPWM) techniques for a five-phase two-level voltage source inverter (VSI). Space vector model of a five-phase VSI shows that there exist 32 space vectors with three different lengths forming three concentric decagons. Application of outer most and middle set of space vectors to implement Space vector PWM yield nearly sinusoidal output. Thus the proposed DPWM utilises the same set of space vectors to implement the discontinuous modulation techniques. Performance is evaluated in terms of total harmonic distortion (THD) in the output phase voltages. A significant reduction in switching losses is observed by adopting the proposed PWM schemes. The simulation and experimental results are provided to validate the concept. I.
2014 IEEE Conference on Energy Conversion (CENCON), 2014
This work presents a novel seven-phase open-end winding induction motor drive supplied by the dua... more This work presents a novel seven-phase open-end winding induction motor drive supplied by the dual non-square matrix converter. The input to each of the matrix converter is three phase utility grid system and the output is seven phase voltages with variable voltage and frequency. The two matrix converters feeding a seven-phase induction motor are supplied from a common single three-phase utility source of 50 Hz. The multi-phase matrix converters are operated by space vector based PWM algorithm. The proposed control technique eliminates the common-mode voltage across the machine winding and hence no zero sequence currents will be produced and therefore no isolated supply is required for the dual three-to-seven phase matrix converter system. A detailed analytical approach is presented to derive the expression of duty cycles which are ultimately used to generate the switching pulses for the matrix converter. A seven phase open-end induction motor model is developed and simulated to support the idea of the proposed modulation scheme for dual matrix converter.
2011 IEEE International Symposium on Industrial Electronics, 2011
The aim of the paper is to present a diagnostic system for shaft misalignment detection. The diag... more The aim of the paper is to present a diagnostic system for shaft misalignment detection. The diagnostic system is used in an adjustable speed sensorless induction motor (IM) drive with an inverter output filter. A nonlinear control algorithm and state observer were used in the motor control. Because the inverter output filter was installed in the drive, the control structure, as well as the estimation systems, were adequately changed. The adaptive neuro-fuzzy inference system (ANFIS) is used for shaft coupling fault detection. ANFIS is based on the analysis of the stator current, motor speed, and load torque processing. ANFIS uses only signals estimated from the state observers whereas observers calculate required variables only on the base of the inverter input voltage and two output current sensors. No additional special sensors are required. The proposed diagnostic system clearly indicates the shaft misalignment. The paper presents the model of the drive, control and estimation algorithms, as well as the diagnostic system. Whole drive and ANFIS fault indicator were verified by experiments for a 1.5 kW induction motor drive system.
The XIX International Conference on Electrical Machines - ICEM 2010, 2010
Abstract Incipient fault detection of electrical machine is a challenging task and requires intel... more Abstract Incipient fault detection of electrical machine is a challenging task and requires intelligent diagnostic approach. Huge research effort is put to automate the fault diagnostic schemes. Among several causes of electrical machine failure the most frequent occurring fault is the mechanical bearing failure. Thus this paper present on-line diagnostic technique for incipient bearing failure in an inverter fed three-phase induction motor drive system. The adaptive neuro-fuzzy inference system is utilized for the diagnostic purpose. The ...
Finite-state model predictive control (FS-MPC) is computationally expensive, as it uses all volta... more Finite-state model predictive control (FS-MPC) is computationally expensive, as it uses all voltage vectors available for prediction and estimation. This paper proposes a novel finite-state model-based predictive current control (MPCC) scheme to overcome the drawbacks of FS-MPC. A reference frame based on the prediction of the current locus when a zero-voltage vector is employed is established to reduce the computational requirements; specifically, only one zero-voltage vector must be predicted compared with the seven required in conventional FS-MPC. The selection of the optimal voltage vector is based on the direction of the current locus in the established reference frame instead of a cost function, which is necessary and time consuming in conventional FS-MPC. Zero-voltage vectors are also selected by contrasting the distance between the reference and predictive currents to reduce the torque ripple of the proposed method. Simulation and experimental results are presented and confirm the efficient performance of the proposed MPCC.
Qatar Foundation Annual Research Forum Proceedings, 2010
Abstract Condition monitoring and fault diagnostics of electrical machines are extremely importan... more Abstract Condition monitoring and fault diagnostics of electrical machines are extremely important in any industrial setup. In some applications, such as the oil and gas industries, production units, power generation, refining and milling, the failure of critical equipment like generators, milling machines, motors, fans and pumps costs millions of dollars in reduced output, emergency maintenance costs and lost revenues. However, in the utility industry, malfunctioning of the electrical machinery is not acceptable not only because of its ...
2013 7th IEEE GCC Conference and Exhibition (GCC), 2013
ABSTRACT This paper presents a three-to-three phase bidirectional partial resonant AC Link conver... more ABSTRACT This paper presents a three-to-three phase bidirectional partial resonant AC Link converter. The converter is modeled in MATLAB/SIMULINK software. The converter has three phase fixed input supplying a three phase load at variable voltage and variable frequency. The converter topology uses two bi-directional switches for each leg of the converter resulting in a total of 12 switches. The high frequency charging and discharging of the link inductor is the main criteria for power transfer from input to output. In each cycle a small interval is allocated for resonances which enables the switches for soft zero voltage turn on and turn off. The converter has the ability for buck and boost operation. Simulation and real-time results are shown for the verification of the proposed converter.
Abstract—Five-phase series-connected two-motor drive system is available in the literature. The p... more Abstract—Five-phase series-connected two-motor drive system is available in the literature. The power supply to such twomotor drive system is considered as matrix converter (direct ACAC converter) with three-phase input and five-phase output. The major advantages of such drive topology is the sinusoidal source side current with controllable input side power factor. The control decoupling is achieved similar to the inverter based drive system. Analytical and simulation results are presented. Index Terms—Five-phase, matrix ...
The XIX International Conference on Electrical Machines - ICEM 2010, 2010
Abstract Multi-phase (more than three-phase) converters are required mainly for feeding variable ... more Abstract Multi-phase (more than three-phase) converters are required mainly for feeding variable speed multi-phase drive systems. This paper presents one such solution by using direct ac-ac converter that can be used to supply a seven-phase drive system. Simple Pulse width modulation (PWM) technique is developed for the proposed matrix converter configuration. The developed modulation technique is based on the comparison of high frequency carrier signal with the duty ratios. Although carrier-based scheme is widely ...
Industrial Electronics, IEEE Transactions on, Nov 1, 2011
Multiphase (more than three phases) power electronic converters are required mainly for feeding v... more Multiphase (more than three phases) power electronic converters are required mainly for feeding variable-speed multiphase drive systems. This paper presents one such solution by using a direct ac-ac converter that can be used to supply a nine-phase drive system. The input is a fixed-voltage and fixed-frequency three-phase input, and the output is a variable-voltage and variable-frequency nine-phase output. A simple pulsewidth-modulation technique is developed for the proposed ac-ac converter named as a ...
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
This paper presents a novel seven-phase open-end winding drive system supplied by the dual non-sq... more This paper presents a novel seven-phase open-end winding drive system supplied by the dual non-square matrix converter. The input to each of the matrix converter is three phase utility grid system and the output is seven phase voltages with variable voltage and frequency. The two matrix converters feeding a seven-phase load are supplied from a common single three-phase utility source of 50 Hz. Space vector based PWM algorithm is developed to control the dual three to seven-phase matrix converter. The proposed control technique eliminates the common-mode voltage across the machine winding and hence no zero sequence currents will be produced and therefore no isolated supply is required for the dual three-to-seven phase matrix converter system. Further the proposed technique will enhance the seven phase machine phase voltage to 1.95 times the voltage produced by a single three to seven phase matrix converter system in the linear modulation range. The paper presents the analytical approach to obtain the expression of modulating signals that are used to generate the switching pulses for the matrix converter. Simulation results are presented to support the idea of the proposed modulation scheme.
IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, 2014
This paper presents a novel topology for a dual three to n-phase direct matrix converter. The ter... more This paper presents a novel topology for a dual three to n-phase direct matrix converter. The term "n" can be used for any number of output phases. The dual matrix converter topology is applied for open-end winding drive system in order to enhance output voltage and simultaneously eliminate common-mode voltage at the machine terminals. The input to each of the matrix converter is three phase utility grid system, whereas the output can be configured to any number of phases with variable voltage and frequency. Generalized carrier based pulse width modulation (PWM) technique is developed to control the dual matrix converters. A dual three to nine-phase matrix converter is utilized for discussion and analysis. The two matrix converters feeding the nine-phase open-end load are supplied from a common single three-phase utility source of 50 Hz. A simple R-L load is considered in the paper. The paper presents an analytical approach to obtain the expression of modulating signals that are used to generate switching pulses for the matrix converter. Simulation and experimental results are presented to support the idea of the proposed modulation scheme.
IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society, 2011
Abstract The direct matrix converter (DMC) is an AC-to-AC direct power conversion topology based ... more Abstract The direct matrix converter (DMC) is an AC-to-AC direct power conversion topology based on controlled bi-directional switches that can generate variable output voltages and sinusoidal source currents with unity power factor. This basic module is used to study a multilevel converter which combines the characteristics of multi-cell topologies and direct power conversion, resulting a Cascaded Matrix Converter (CMC) based on 3× 2 direct matrix converter cells. This converter is fully regenerative, with stepped output voltage and ...
International Journal of Power Electronics and Drive Systems (IJPEDS), 2012
This paper develops discontinuous space vector PWM (DPWM) techniques for a five-phase two-level v... more This paper develops discontinuous space vector PWM (DPWM) techniques for a five-phase two-level voltage source inverter (VSI). Space vector model of a five-phase VSI shows that there exist 32 space vectors with three different lengths forming three concentric decagons. Application of outer most and middle set of space vectors to implement Space vector PWM yield nearly sinusoidal output. Thus the proposed DPWM utilises the same set of space vectors to implement the discontinuous modulation techniques. Performance is evaluated in terms of total harmonic distortion (THD) in the output phase voltages. A significant reduction in switching losses is observed by adopting the proposed PWM schemes. The simulation and experimental results are provided to validate the concept. I.
2014 IEEE Conference on Energy Conversion (CENCON), 2014
This work presents a novel seven-phase open-end winding induction motor drive supplied by the dua... more This work presents a novel seven-phase open-end winding induction motor drive supplied by the dual non-square matrix converter. The input to each of the matrix converter is three phase utility grid system and the output is seven phase voltages with variable voltage and frequency. The two matrix converters feeding a seven-phase induction motor are supplied from a common single three-phase utility source of 50 Hz. The multi-phase matrix converters are operated by space vector based PWM algorithm. The proposed control technique eliminates the common-mode voltage across the machine winding and hence no zero sequence currents will be produced and therefore no isolated supply is required for the dual three-to-seven phase matrix converter system. A detailed analytical approach is presented to derive the expression of duty cycles which are ultimately used to generate the switching pulses for the matrix converter. A seven phase open-end induction motor model is developed and simulated to support the idea of the proposed modulation scheme for dual matrix converter.
2011 IEEE International Symposium on Industrial Electronics, 2011
The aim of the paper is to present a diagnostic system for shaft misalignment detection. The diag... more The aim of the paper is to present a diagnostic system for shaft misalignment detection. The diagnostic system is used in an adjustable speed sensorless induction motor (IM) drive with an inverter output filter. A nonlinear control algorithm and state observer were used in the motor control. Because the inverter output filter was installed in the drive, the control structure, as well as the estimation systems, were adequately changed. The adaptive neuro-fuzzy inference system (ANFIS) is used for shaft coupling fault detection. ANFIS is based on the analysis of the stator current, motor speed, and load torque processing. ANFIS uses only signals estimated from the state observers whereas observers calculate required variables only on the base of the inverter input voltage and two output current sensors. No additional special sensors are required. The proposed diagnostic system clearly indicates the shaft misalignment. The paper presents the model of the drive, control and estimation algorithms, as well as the diagnostic system. Whole drive and ANFIS fault indicator were verified by experiments for a 1.5 kW induction motor drive system.
The XIX International Conference on Electrical Machines - ICEM 2010, 2010
Abstract Incipient fault detection of electrical machine is a challenging task and requires intel... more Abstract Incipient fault detection of electrical machine is a challenging task and requires intelligent diagnostic approach. Huge research effort is put to automate the fault diagnostic schemes. Among several causes of electrical machine failure the most frequent occurring fault is the mechanical bearing failure. Thus this paper present on-line diagnostic technique for incipient bearing failure in an inverter fed three-phase induction motor drive system. The adaptive neuro-fuzzy inference system is utilized for the diagnostic purpose. The ...
Finite-state model predictive control (FS-MPC) is computationally expensive, as it uses all volta... more Finite-state model predictive control (FS-MPC) is computationally expensive, as it uses all voltage vectors available for prediction and estimation. This paper proposes a novel finite-state model-based predictive current control (MPCC) scheme to overcome the drawbacks of FS-MPC. A reference frame based on the prediction of the current locus when a zero-voltage vector is employed is established to reduce the computational requirements; specifically, only one zero-voltage vector must be predicted compared with the seven required in conventional FS-MPC. The selection of the optimal voltage vector is based on the direction of the current locus in the established reference frame instead of a cost function, which is necessary and time consuming in conventional FS-MPC. Zero-voltage vectors are also selected by contrasting the distance between the reference and predictive currents to reduce the torque ripple of the proposed method. Simulation and experimental results are presented and confirm the efficient performance of the proposed MPCC.
Qatar Foundation Annual Research Forum Proceedings, 2010
Abstract Condition monitoring and fault diagnostics of electrical machines are extremely importan... more Abstract Condition monitoring and fault diagnostics of electrical machines are extremely important in any industrial setup. In some applications, such as the oil and gas industries, production units, power generation, refining and milling, the failure of critical equipment like generators, milling machines, motors, fans and pumps costs millions of dollars in reduced output, emergency maintenance costs and lost revenues. However, in the utility industry, malfunctioning of the electrical machinery is not acceptable not only because of its ...
2013 7th IEEE GCC Conference and Exhibition (GCC), 2013
ABSTRACT This paper presents a three-to-three phase bidirectional partial resonant AC Link conver... more ABSTRACT This paper presents a three-to-three phase bidirectional partial resonant AC Link converter. The converter is modeled in MATLAB/SIMULINK software. The converter has three phase fixed input supplying a three phase load at variable voltage and variable frequency. The converter topology uses two bi-directional switches for each leg of the converter resulting in a total of 12 switches. The high frequency charging and discharging of the link inductor is the main criteria for power transfer from input to output. In each cycle a small interval is allocated for resonances which enables the switches for soft zero voltage turn on and turn off. The converter has the ability for buck and boost operation. Simulation and real-time results are shown for the verification of the proposed converter.
Abstract—Five-phase series-connected two-motor drive system is available in the literature. The p... more Abstract—Five-phase series-connected two-motor drive system is available in the literature. The power supply to such twomotor drive system is considered as matrix converter (direct ACAC converter) with three-phase input and five-phase output. The major advantages of such drive topology is the sinusoidal source side current with controllable input side power factor. The control decoupling is achieved similar to the inverter based drive system. Analytical and simulation results are presented. Index Terms—Five-phase, matrix ...
The XIX International Conference on Electrical Machines - ICEM 2010, 2010
Abstract Multi-phase (more than three-phase) converters are required mainly for feeding variable ... more Abstract Multi-phase (more than three-phase) converters are required mainly for feeding variable speed multi-phase drive systems. This paper presents one such solution by using direct ac-ac converter that can be used to supply a seven-phase drive system. Simple Pulse width modulation (PWM) technique is developed for the proposed matrix converter configuration. The developed modulation technique is based on the comparison of high frequency carrier signal with the duty ratios. Although carrier-based scheme is widely ...
Industrial Electronics, IEEE Transactions on, Nov 1, 2011
Multiphase (more than three phases) power electronic converters are required mainly for feeding v... more Multiphase (more than three phases) power electronic converters are required mainly for feeding variable-speed multiphase drive systems. This paper presents one such solution by using a direct ac-ac converter that can be used to supply a nine-phase drive system. The input is a fixed-voltage and fixed-frequency three-phase input, and the output is a variable-voltage and variable-frequency nine-phase output. A simple pulsewidth-modulation technique is developed for the proposed ac-ac converter named as a ...
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