EPE Association: EPE 2009 - Subtopic 08-2 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (II)'

EPE 2009 - Subtopic 08-2 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (II)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 08: 'Measurements and Sensors' > EPE 2009 - Subtopic 08-2 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (II)'

   [return to parent folder]

   Real-time Electro-Thermal Simulation of a Motor Drive System
By takeshi HORIGUCHI, takeshi OI, masaya HARAKAWA, akira IMANAKA, tetsuaki NAGANO [View]
[Download]

Abstract: This paper presents a real-time electro-thermal simulation system which is a novel method of estimating the junction temperatures of power semiconductors. It calculates the junction temperatures of the power semiconductors in real time. The load current and the output voltage of an actual power conversion system are detected to calculate the instantaneous power loss. The detected output voltage is transferred to an FPGA board with a clock of 50 MHz. The PWM signal is reconstructed in the FPGA board using the output voltage of the inverter and it is forwarded to the real-time computer. Using the load current and the reconstructed PWM signal, the power losses and the junction temperatures of the power semiconductors are calculated in the real-time computer. The simulation results are in very good agreement with the experimental results. The junction temperatures of the power semiconductors are estimated under the actual operation using the real-time electro-thermal simulation system.

   Detection of Rotor Turn-to-Turn Faults in Doubly-Fed Induction Generators in Wind Energy Plants by means of observers
By Vincenz DINKHAUSER, Friedrich W. FUCHS [View]
[Download]

Abstract: The importance of Condition monitoring and fault detection increases. This paper presents a state-space observer based condition monitoring algorithm for the detection of rotor turn-to-turn faults in doubly-fed induction generators. A reduced order time invariant machine model for asymmetrical internal parameters will be derived. The model is used for simulation of rotor turn-to-turn faults, which can cause phase to ground or phase to phase shortings in the rotor. Furthermore a Luenberger observer will be designed using the reduced machine model. It can be used for detection and identification of rotor turn-to-turn faults by analyzing the different behavior of system and observer. Another advantage of the observer is its ability to reconstruct immeasurable internal states like the current in the shorted turns of the turnto- turn fault. Due to the fact that the induced fault current is speed dependent and becomes zero at synchronous speed, the reconstruction of the fault current can help to evaluate the danger of the short-cut current at the actual operating point of the generator and permits a limited operation until maintenance.

   A novel Approach to Gear Box Condition Monitoring by Using Drive Rectifier Input Currents
By Jesus ARELLANO-PADILLA, Mark SUMNER, Chris GERADA, Jing LI [View]
[Download]

Abstract: Gearboxes are widely used and subjected to progressive deterioration which makes box condition monitoring a relevant topic in the servodrive industry. This paper proposes a novel scheme for performing integral condition monitoring in a drive containing a gearbox. The proposed scheme is based on a modified MCSA scheme (motor current signature analysis) that uses the drive rectifier input currents instead than the machine currents, as in the case of the conventional scheme. The approach is based on the principle that any fault signature generated due to a faulty component (machine, load, mains, or power converters) propagates through the driveâ€™s main components (rectifier-inverter). In most of the cases the fault signatures should be detectable at the input side by carefully looking at the rectifier supply currents. The proposed scheme allows not only condition monitoring of the gearbox and the machine, but other driveâ€™s components at no extra cost. An experimental investigation is carried out to demonstrate the feasibility of the scheme to detect a faulty gearbox in a PM servo drive operating under different working conditions. Important differences in magnitude for those frequencies related to the gearbox and system unbalances were found at the input side when the test was repeated with faulty gearbox, which demonstrates the feasibility of the scheme.

EPE 2009 - Subtopic 08-2 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (II)'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 08: 'Measurements and Sensors' > EPE 2009 - Subtopic 08-2 - LS: 'Measurement and Estimation Techniques (in power electronic systems and drives) (II)'
	[return to parent folder]

	Real-time Electro-Thermal Simulation of a Motor Drive System By takeshi HORIGUCHI, takeshi OI, masaya HARAKAWA, akira IMANAKA, tetsuaki NAGANO	[View] [Download]
Abstract: This paper presents a real-time electro-thermal simulation system which is a novel method of estimating the junction temperatures of power semiconductors. It calculates the junction temperatures of the power semiconductors in real time. The load current and the output voltage of an actual power conversion system are detected to calculate the instantaneous power loss. The detected output voltage is transferred to an FPGA board with a clock of 50 MHz. The PWM signal is reconstructed in the FPGA board using the output voltage of the inverter and it is forwarded to the real-time computer. Using the load current and the reconstructed PWM signal, the power losses and the junction temperatures of the power semiconductors are calculated in the real-time computer. The simulation results are in very good agreement with the experimental results. The junction temperatures of the power semiconductors are estimated under the actual operation using the real-time electro-thermal simulation system.

	Detection of Rotor Turn-to-Turn Faults in Doubly-Fed Induction Generators in Wind Energy Plants by means of observers By Vincenz DINKHAUSER, Friedrich W. FUCHS	[View] [Download]
Abstract: The importance of Condition monitoring and fault detection increases. This paper presents a state-space observer based condition monitoring algorithm for the detection of rotor turn-to-turn faults in doubly-fed induction generators. A reduced order time invariant machine model for asymmetrical internal parameters will be derived. The model is used for simulation of rotor turn-to-turn faults, which can cause phase to ground or phase to phase shortings in the rotor. Furthermore a Luenberger observer will be designed using the reduced machine model. It can be used for detection and identification of rotor turn-to-turn faults by analyzing the different behavior of system and observer. Another advantage of the observer is its ability to reconstruct immeasurable internal states like the current in the shorted turns of the turnto- turn fault. Due to the fact that the induced fault current is speed dependent and becomes zero at synchronous speed, the reconstruction of the fault current can help to evaluate the danger of the short-cut current at the actual operating point of the generator and permits a limited operation until maintenance.

	A novel Approach to Gear Box Condition Monitoring by Using Drive Rectifier Input Currents By Jesus ARELLANO-PADILLA, Mark SUMNER, Chris GERADA, Jing LI	[View] [Download]
Abstract: Gearboxes are widely used and subjected to progressive deterioration which makes box condition monitoring a relevant topic in the servodrive industry. This paper proposes a novel scheme for performing integral condition monitoring in a drive containing a gearbox. The proposed scheme is based on a modified MCSA scheme (motor current signature analysis) that uses the drive rectifier input currents instead than the machine currents, as in the case of the conventional scheme. The approach is based on the principle that any fault signature generated due to a faulty component (machine, load, mains, or power converters) propagates through the driveâ€™s main components (rectifier-inverter). In most of the cases the fault signatures should be detectable at the input side by carefully looking at the rectifier supply currents. The proposed scheme allows not only condition monitoring of the gearbox and the machine, but other driveâ€™s components at no extra cost. An experimental investigation is carried out to demonstrate the feasibility of the scheme to detect a faulty gearbox in a PM servo drive operating under different working conditions. Important differences in magnitude for those frequencies related to the gearbox and system unbalances were found at the input side when the test was repeated with faulty gearbox, which demonstrates the feasibility of the scheme.