EPE Association: EPE 2014 - DS1c: Measurements Techniques

EPE 2014 - DS1c: Measurements Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 03: Measurement and Control > EPE 2014 - DS1c: Measurements Techniques

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   A different approach to electrical energy consumption monitoring
By Peteris APSE-APSITIS, Ansis AVOTINS, Leonids RIBICKIS [View]
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Abstract: A different approach to electrical energy/power calculation by means of summing of non-even timecurrent samples over short time periods are described in to the article.

   A Fast Filtering Scheme for Capacitor Voltages of a Cascaded H-Bridge Multilevel Converter Based STATCOM
By Ghias FARIVAR, Vassilios AGELIDIS, Branislav HREDZAK [View]
[Download]

Abstract: In this paper a capacitor voltage filtering scheme for a cascaded H-bridge (CHB) multilevel converter basedSTATCOM is proposed. The scheme is based on an analytic formula derived from the system model in order to cancel out the low frequency ripple of the capacitors voltages. The scheme remains effective even under high magnitude voltage ripple which would be present when lower capacitance film capacitors are used. Hence, the scheme would enable the use of reliable film capacitors instead of conventional electrolytic capacitors in theCHB multilevel converter based STATCOM system. Another advantage of the proposed scheme is that imposes only a negligible delay to the control system. Simulations on a 1100 W, single-phase, 7-level CHB converter based STATCOM confirm viability of the proposed filtering scheme.

   A Generalized Capacitors Voltage Estimation Scheme for Multilevel Converters
By Ghias FARIVAR, Vassilios AGELIDIS, Branislav HREDZAK [View]
[Download]

Abstract: In this paper a generalized scheme for capacitors voltage estimation for multilevel converters based on the converter switching states and using only a single voltage sensor at the AC side of the converter is proposed. The estimation of the capacitors voltage is performed after a capacitor is switched on or off and hence the estimation frequency is dependent on the converter switching frequency. In between the switching periods, the scheme can keep track of the capacitors voltage by monitoring the current flowing through the capacitor until the next transition. The effectiveness of the proposed scheme is demonstrated on a single-phase 7-level cascaded H-Bridge multilevel converter based STATCOM by simulation in the Matlab/Simulink environment.

   Analysis and Practical Relevance of CM/DM EMI Noise Separator Characteristics
By Sebastian SCHROTH, Florian KRISMER, Johann Walter KOLAR, Hans ERTL [View]
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Abstract: This Paper details two different contributions related to practical CM/DM EMI measurements.A first part investigates sources and implications of measurement errors that result for CM/DMseparators in a practical measurement environment with a particular focus on the recentlypresented input impedance criterion for CM/DM separators. Furthermore, the realization of anactive CM/DM separator, which features competitive separation capabilities (DMTR/CMRR >51 dB and CMTR/DMRR > 47 dB for frequencies up to 10MHz), is presented.

   Dynamic Torque Measurement of Drive Transmission in Vehicles Being in Motion Using Strain Gauges Measurement Technique and Wireless Data Transmission
By Andrzej NIEDWOROK [View]
[Download]

Abstract: Innovative method of a real time measuring of drive systems operational parameters is presented. Such systems are commonly used in transportation vehicles working in cooper mines. Cardan shaft with strain gauge bridge was used as autonomous torque transducer, transmitting remotely measuring data in real time to the master system for data acquisition.

   GaN-HEMT Fast Switching Current Measurement Method Based on Current Surface Probe
By Ke LI, Arnaud VIDET, Nadir IDIR [View]
[Download]

Abstract: With the advantage of high bandwidth and small insertion impedance, a current surfaceprobe (CSP) used to measure switching current waveforms is presented in this paper. Its transfer impedance is characterized and validated in the first time by measuring an IGBT switching current with a passive current probe (CP) and a Hall effect current probe (HECP). It is also shown that a return current beneath the PCB on which is put the CSP can reduce its transfer impedance. In the second time, the CSP is used to measure a GaN-HEMT switching current and the obtained results are compared with those measured with a current shunt (CS). The comparison of these results prove that CSP and CS are able to measure fast switching current (of the order a few nanoseconds). However, the advantage of the CSP is that it has no influence on the power device Vds voltage measurement. Also, the CSP brings less parasitic inductance in the commutation mesh than the CS and it does not have the ground connection drawback, which is the case for the CS.

   Study of incipient bearing damage monitoring in variable-speed drive systems
By Jero AHOLA, Annette MUETZE, Aleksei ROMANENKO, Ville NISKANEN [View]
[Download]

Abstract: Inverter-induced high-frequency bearing currents are a common root cause of bearing failures in frequency converter-fed motors and generators. Bearing faults are typically identified by vibration measurements. In our work, we experimentally submit bearings to electric discharge machining (EDM) bearing currents, use different means to measure the electrical stress placed on the bearings, measure the resulting vibration signal, and apply signal processing for feature extraction. All this is done 1184 hours of operation, so as to study the incipient bearing failure behavior.

   Synthetic test-bench for measurement of bearing-currents in inverter fed drives
By Yves GEMEINDER, Gael MESSAGER, Andreas BINDER [View]
[Download]

Abstract: A synthetic test bench with two different voltage sources is described to investigate bearing currents, based on a lumped element model of an electrical motor. The aim of this synthetic test bench is to reproduce the voltage and current wave form at the bearing, which actually happen in bearings of inverter-fed motors, to investigate the influence of these electric quantities on bearing failures.

EPE 2014 - DS1c: Measurements Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 03: Measurement and Control > EPE 2014 - DS1c: Measurements Techniques
	[return to parent folder]

	A different approach to electrical energy consumption monitoring By Peteris APSE-APSITIS, Ansis AVOTINS, Leonids RIBICKIS	[View] [Download]
Abstract: A different approach to electrical energy/power calculation by means of summing of non-even timecurrent samples over short time periods are described in to the article.

	A Fast Filtering Scheme for Capacitor Voltages of a Cascaded H-Bridge Multilevel Converter Based STATCOM By Ghias FARIVAR, Vassilios AGELIDIS, Branislav HREDZAK	[View] [Download]
Abstract: In this paper a capacitor voltage filtering scheme for a cascaded H-bridge (CHB) multilevel converter basedSTATCOM is proposed. The scheme is based on an analytic formula derived from the system model in order to cancel out the low frequency ripple of the capacitors voltages. The scheme remains effective even under high magnitude voltage ripple which would be present when lower capacitance film capacitors are used. Hence, the scheme would enable the use of reliable film capacitors instead of conventional electrolytic capacitors in theCHB multilevel converter based STATCOM system. Another advantage of the proposed scheme is that imposes only a negligible delay to the control system. Simulations on a 1100 W, single-phase, 7-level CHB converter based STATCOM confirm viability of the proposed filtering scheme.

	A Generalized Capacitors Voltage Estimation Scheme for Multilevel Converters By Ghias FARIVAR, Vassilios AGELIDIS, Branislav HREDZAK	[View] [Download]
Abstract: In this paper a generalized scheme for capacitors voltage estimation for multilevel converters based on the converter switching states and using only a single voltage sensor at the AC side of the converter is proposed. The estimation of the capacitors voltage is performed after a capacitor is switched on or off and hence the estimation frequency is dependent on the converter switching frequency. In between the switching periods, the scheme can keep track of the capacitors voltage by monitoring the current flowing through the capacitor until the next transition. The effectiveness of the proposed scheme is demonstrated on a single-phase 7-level cascaded H-Bridge multilevel converter based STATCOM by simulation in the Matlab/Simulink environment.

	Analysis and Practical Relevance of CM/DM EMI Noise Separator Characteristics By Sebastian SCHROTH, Florian KRISMER, Johann Walter KOLAR, Hans ERTL	[View] [Download]
Abstract: This Paper details two different contributions related to practical CM/DM EMI measurements.A first part investigates sources and implications of measurement errors that result for CM/DMseparators in a practical measurement environment with a particular focus on the recentlypresented input impedance criterion for CM/DM separators. Furthermore, the realization of anactive CM/DM separator, which features competitive separation capabilities (DMTR/CMRR >51 dB and CMTR/DMRR > 47 dB for frequencies up to 10MHz), is presented.

	Dynamic Torque Measurement of Drive Transmission in Vehicles Being in Motion Using Strain Gauges Measurement Technique and Wireless Data Transmission By Andrzej NIEDWOROK	[View] [Download]
Abstract: Innovative method of a real time measuring of drive systems operational parameters is presented. Such systems are commonly used in transportation vehicles working in cooper mines. Cardan shaft with strain gauge bridge was used as autonomous torque transducer, transmitting remotely measuring data in real time to the master system for data acquisition.

	GaN-HEMT Fast Switching Current Measurement Method Based on Current Surface Probe By Ke LI, Arnaud VIDET, Nadir IDIR	[View] [Download]
Abstract: With the advantage of high bandwidth and small insertion impedance, a current surfaceprobe (CSP) used to measure switching current waveforms is presented in this paper. Its transfer impedance is characterized and validated in the first time by measuring an IGBT switching current with a passive current probe (CP) and a Hall effect current probe (HECP). It is also shown that a return current beneath the PCB on which is put the CSP can reduce its transfer impedance. In the second time, the CSP is used to measure a GaN-HEMT switching current and the obtained results are compared with those measured with a current shunt (CS). The comparison of these results prove that CSP and CS are able to measure fast switching current (of the order a few nanoseconds). However, the advantage of the CSP is that it has no influence on the power device Vds voltage measurement. Also, the CSP brings less parasitic inductance in the commutation mesh than the CS and it does not have the ground connection drawback, which is the case for the CS.

	Study of incipient bearing damage monitoring in variable-speed drive systems By Jero AHOLA, Annette MUETZE, Aleksei ROMANENKO, Ville NISKANEN	[View] [Download]
Abstract: Inverter-induced high-frequency bearing currents are a common root cause of bearing failures in frequency converter-fed motors and generators. Bearing faults are typically identified by vibration measurements. In our work, we experimentally submit bearings to electric discharge machining (EDM) bearing currents, use different means to measure the electrical stress placed on the bearings, measure the resulting vibration signal, and apply signal processing for feature extraction. All this is done 1184 hours of operation, so as to study the incipient bearing failure behavior.

	Synthetic test-bench for measurement of bearing-currents in inverter fed drives By Yves GEMEINDER, Gael MESSAGER, Andreas BINDER	[View] [Download]
Abstract: A synthetic test bench with two different voltage sources is described to investigate bearing currents, based on a lumped element model of an electrical motor. The aim of this synthetic test bench is to reproduce the voltage and current wave form at the bearing, which actually happen in bearings of inverter-fed motors, to investigate the influence of these electric quantities on bearing failures.