EPE Association: EPE 2019 - DS2c: Reliability

EPE 2019 - DS2c: Reliability
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 01: Devices, Packaging and System Integration > EPE 2019 - DS2c: Reliability

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   FAULT ANALYSIS OF STRING BASED INVERTERS PV PLANT WITH THE REFERENCE TO HARMONICS RESONANCE EFFECT
By Boris DUMNIC [View]
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Abstract: The paper analyzes a photovoltaic (PV) power system plant based on string inverters operating in parallel and it specifically analyzes the faults experienced in the plant system. A fault classification and a root-cause analysis oriented to be used for reliability improvement are done based on field experience acquired through long-term operation and maintenance activities in a 536 kW PV power plant. The harmonic resonance effect, that can appear with significant negative consequences in multiple string inverters based PV systems, is carefully considered as being one of the most frequent reasons for operation faults. Practical reliability improvement suggestions are also given.

   GaN-Based Full-Bridge Converter with Digitally Adjustable Voltage Slopes for Characterization of Inter-Winding Insulation Properties of Magnetic High-Frequency
By Vivien GRAU [View]
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Abstract: The very high switching speed of wide-bandgap semiconductor devices enables higher switching frequencies at lower losses. However, it can also cause negative effects on the insulation material. For investigating the effect of steep voltage slopes on inter-winding insulation systems, a GaN-based full-bridge converter with digitally adjustable voltage slopes is developed and presented within this paper.

   Online electrolytic capacitor prognosis system for PWM drives
By Martin FOSTER [View]
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Abstract: Electrolytic capacitors are ubiquitous in power electronic systems owing to their relatively large capacitance-to-volume ratio provided by virtue of their anodised electrode and electrolyte. As the capacitor ages, the electrolyte solution present in the capacitor is known to reduce and this leads to an increase in the equivalent series resistance (ESR) and a reduction in the capacitance. End-of-life for electrolytic capacitors is indicated by an increase in ESR by a factor of two. Here a prognostic system is proposed that can measure the ESR of a capacitor while it is operating in a PWM circuit. By using lock-in amplifiers synchronised to the PWM fundamental frequency, it is possible to extract precisely capacitor ripple voltage and ripple current. These signals are then combined to provide an estimate for the ESR.

   Simulation of current crowding in inverse diodes of low-voltage Si MOSEFTs at power cycling
By Christian SCHWABE [View]
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Abstract: Experimental results showed large difference in power cycling capability when a low voltage MOSFET (inf.100V) is tested in MOSFET mode (1. quadrant) or as inverse body diode (3. quadrant) under the same thermal stress conditions. This paper is focusing on a three dimensional (3D) simulation investigating the difference in lifetime estimation. The simulation is carried out in ANSYS as a coupled thermo-electrical simulation with a new developed approach for the diode characteristic. The results of the simulation are showing wide differences in temperature distribution and current density. Strong current crowding during the operation of the inverse body diode was observed. This leads to more stress in the bond interconnections, which gives an explanation for the different lifetime in the experimental investigation.

   Wire bonding failure signature using high frequency characterization
By Stéphane BAFFREAU [View]
[Download]

Abstract: This study deals with electromagnetic characterization of power electronic modules wire bonding failure. The several steps of the characterization method in order to reveal high frequency signature, are detailed. The application of the method is illustrated on isolated prototype. Simulation and experimental results highlight the same signature of the failure.

EPE 2019 - DS2c: Reliability
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 01: Devices, Packaging and System Integration > EPE 2019 - DS2c: Reliability
	[return to parent folder]

	FAULT ANALYSIS OF STRING BASED INVERTERS PV PLANT WITH THE REFERENCE TO HARMONICS RESONANCE EFFECT By Boris DUMNIC	[View] [Download]
Abstract: The paper analyzes a photovoltaic (PV) power system plant based on string inverters operating in parallel and it specifically analyzes the faults experienced in the plant system. A fault classification and a root-cause analysis oriented to be used for reliability improvement are done based on field experience acquired through long-term operation and maintenance activities in a 536 kW PV power plant. The harmonic resonance effect, that can appear with significant negative consequences in multiple string inverters based PV systems, is carefully considered as being one of the most frequent reasons for operation faults. Practical reliability improvement suggestions are also given.

	GaN-Based Full-Bridge Converter with Digitally Adjustable Voltage Slopes for Characterization of Inter-Winding Insulation Properties of Magnetic High-Frequency By Vivien GRAU	[View] [Download]
Abstract: The very high switching speed of wide-bandgap semiconductor devices enables higher switching frequencies at lower losses. However, it can also cause negative effects on the insulation material. For investigating the effect of steep voltage slopes on inter-winding insulation systems, a GaN-based full-bridge converter with digitally adjustable voltage slopes is developed and presented within this paper.

	Online electrolytic capacitor prognosis system for PWM drives By Martin FOSTER	[View] [Download]
Abstract: Electrolytic capacitors are ubiquitous in power electronic systems owing to their relatively large capacitance-to-volume ratio provided by virtue of their anodised electrode and electrolyte. As the capacitor ages, the electrolyte solution present in the capacitor is known to reduce and this leads to an increase in the equivalent series resistance (ESR) and a reduction in the capacitance. End-of-life for electrolytic capacitors is indicated by an increase in ESR by a factor of two. Here a prognostic system is proposed that can measure the ESR of a capacitor while it is operating in a PWM circuit. By using lock-in amplifiers synchronised to the PWM fundamental frequency, it is possible to extract precisely capacitor ripple voltage and ripple current. These signals are then combined to provide an estimate for the ESR.

	Simulation of current crowding in inverse diodes of low-voltage Si MOSEFTs at power cycling By Christian SCHWABE	[View] [Download]
Abstract: Experimental results showed large difference in power cycling capability when a low voltage MOSFET (inf.100V) is tested in MOSFET mode (1. quadrant) or as inverse body diode (3. quadrant) under the same thermal stress conditions. This paper is focusing on a three dimensional (3D) simulation investigating the difference in lifetime estimation. The simulation is carried out in ANSYS as a coupled thermo-electrical simulation with a new developed approach for the diode characteristic. The results of the simulation are showing wide differences in temperature distribution and current density. Strong current crowding during the operation of the inverse body diode was observed. This leads to more stress in the bond interconnections, which gives an explanation for the different lifetime in the experimental investigation.

	Wire bonding failure signature using high frequency characterization By Stéphane BAFFREAU	[View] [Download]
Abstract: This study deals with electromagnetic characterization of power electronic modules wire bonding failure. The several steps of the characterization method in order to reveal high frequency signature, are detailed. The application of the method is illustrated on isolated prototype. Simulation and experimental results highlight the same signature of the failure.