EPE Association: EPE 2011 - LS5g: Topic 11: Fault Tolerant Drives

EPE 2011 - LS5g: Topic 11: Fault Tolerant Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 11: Adjustable speed drives > EPE 2011 - LS5g: Topic 11: Fault Tolerant Drives

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   A Fault Tolerant Drive for High Speed PM Machines
By Johan WOLMARANS, Henk POLINDER, Bram FERREIRA [View]
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Abstract: High speed electrical machines are replacing existing subsystems in aircraft. Electrical drives need to have high availability and good power density to be considered a viable replacement. To achieve high availability fault tolerance is added to the system design. Power density is increased by spatial integration of subparts. Fault tolerance extends to both machine and power electronics design. By use of low frequency modulation in a high speed, multiphase, fault tolerant drive, losses are reduced. High efficiency and power density result. The air cooled converter will be subjected to varying atmospheric conditions during flight. Low air pressure reduces cooling capacity at high altitude and requires increased air velocity to keep temperatures stable.

   A Fault-Tolerant Permanent Magnet Synchronous Motor Drive with Integrated Voltage Source Inverter Open-Circuit Faults Diagnosis
By Jorge ESTIMA, A. J. MARQUES CARDOSO [View]
[Download]

Abstract: This paper presents a variable speed ac drive based on a permanent magnet synchronous motor, supplied by a three-phase fault-tolerant power converter. In order to achieve this, beyond the main routines, the control system integrates a reliable and simple algorithm for real-time diagnostics of inverter open-circuit faults. This algorithm performs an important role since it is able to detect an inverter malfunction and gives the information about its faulty phase. Then, the control system acts in order to first isolate the fault and then to proceed to a hardware and software reconfiguration. By doing this, a fully automated fault-tolerant variable speed drive can be achieved. Simulation and experimental results are presented showing the effectiveness of the proposed system under several operating conditions.

   Performance Analysis of Active Damped Small DC Link Capacitor Based Drive for Unbalanced Input Voltage Supply
By Ramkrishan MAHESHWARI, Stig MUNK-NIELSEN [View]
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Abstract: A small DC-link capacitor based drive is presented in this paper. The drive shows negative impedance instability at operating points with high power load. A phase portrait is presented for input filter states which exhibit a limit cycle. When the drive is operated with unbalanced input supply voltages, the rectified voltage contains all even harmonics frequencies. However, it is shown that the dominant harmonic component of the DC-link voltage is decided by the limit cycle instead of the input filter resonance frequency. An active damping technique is used to stabilize the operating point. The responses of the DC-link voltage with and without active damping are presented. The low order harmonics components are reduced with the increase in the gain of the active damping term. The experimental results for the DC-link voltage, input phase currents, and machine phase current are presented.

EPE 2011 - LS5g: Topic 11: Fault Tolerant Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 11: Adjustable speed drives > EPE 2011 - LS5g: Topic 11: Fault Tolerant Drives
	[return to parent folder]

	A Fault Tolerant Drive for High Speed PM Machines By Johan WOLMARANS, Henk POLINDER, Bram FERREIRA	[View] [Download]
Abstract: High speed electrical machines are replacing existing subsystems in aircraft. Electrical drives need to have high availability and good power density to be considered a viable replacement. To achieve high availability fault tolerance is added to the system design. Power density is increased by spatial integration of subparts. Fault tolerance extends to both machine and power electronics design. By use of low frequency modulation in a high speed, multiphase, fault tolerant drive, losses are reduced. High efficiency and power density result. The air cooled converter will be subjected to varying atmospheric conditions during flight. Low air pressure reduces cooling capacity at high altitude and requires increased air velocity to keep temperatures stable.

	A Fault-Tolerant Permanent Magnet Synchronous Motor Drive with Integrated Voltage Source Inverter Open-Circuit Faults Diagnosis By Jorge ESTIMA, A. J. MARQUES CARDOSO	[View] [Download]
Abstract: This paper presents a variable speed ac drive based on a permanent magnet synchronous motor, supplied by a three-phase fault-tolerant power converter. In order to achieve this, beyond the main routines, the control system integrates a reliable and simple algorithm for real-time diagnostics of inverter open-circuit faults. This algorithm performs an important role since it is able to detect an inverter malfunction and gives the information about its faulty phase. Then, the control system acts in order to first isolate the fault and then to proceed to a hardware and software reconfiguration. By doing this, a fully automated fault-tolerant variable speed drive can be achieved. Simulation and experimental results are presented showing the effectiveness of the proposed system under several operating conditions.

	Performance Analysis of Active Damped Small DC Link Capacitor Based Drive for Unbalanced Input Voltage Supply By Ramkrishan MAHESHWARI, Stig MUNK-NIELSEN	[View] [Download]
Abstract: A small DC-link capacitor based drive is presented in this paper. The drive shows negative impedance instability at operating points with high power load. A phase portrait is presented for input filter states which exhibit a limit cycle. When the drive is operated with unbalanced input supply voltages, the rectified voltage contains all even harmonics frequencies. However, it is shown that the dominant harmonic component of the DC-link voltage is decided by the limit cycle instead of the input filter resonance frequency. An active damping technique is used to stabilize the operating point. The responses of the DC-link voltage with and without active damping are presented. The low order harmonics components are reduced with the increase in the gain of the active damping term. The experimental results for the DC-link voltage, input phase currents, and machine phase current are presented.