Voltage ripple analysis based on DC-link current harmonics for Voltage Source Inverters

Rettner, Cornelius; Jacob, George; Schiedermeier, Maximilian; Apelsmeier, Andreas; März, Martin

doi:10.1109/compel.2019.8769623

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…The switch currents and thus the DC-link currents 1 , 2 and are calculated from this. The validity of this simulation method has been proven by measurement in [14]. The contents explained and verified in [5,6] and [7] form the basis for the verifications by calculation which are presented below.…”

Section: Verification Of the Results Through Simulation And Calculationmentioning

confidence: 93%

“…The frequencies at which the highest spectrum amplitudes of a single-inverter 1 ( ) occur are known from the results published in [7,14]. These are the harmonics of the switching frequency and their sidebands.…”

Section: Analytic Rms-current Calculationmentioning

confidence: 99%

“…Based on the measured voltages between the phases of the inverter and -, the time periods with conductive upper switches have been extracted. By combining this information with the measured phase currents, the switch currents can be derived analogously to the procedure explained in [14]. The sum of the upper switch currents of a sub-inverter represents its DC-link current.…”

Section: Metrological Verificationmentioning

confidence: 99%

“…Based on this, the foundation for an optimized design of the DC-link capacitor and a real-time capable determination of the ideal switching cycle shift is created. The downsizing of the DC-link capacitor, which is enabled according to [14], creates a potential for reducing costs, weight and volume.…”

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confidence: 99%

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Analytical Calculation of the RMS Value and the Spectrum of the DC-Link Current of a Dual-Inverter

Schiedermeier

Schlamp

Rettner

et al. 2022

IEEE Trans. Power Electron.

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This paper is focused on the analytic definition of the DC-link current of a dual-inverter. Therefore, a two-level dualinverter for driving two independent three-phase electrical motors is considered. Space-vector modulation is taken into account as the modulation method of the inverter. Based on that, an analytic description is derived for the frequency spectrum as well as for the RMS value of the DC-link current of a dual-inverter. Contrary to the current definitions known from previous publications, the expressions presented below are defined in solved form. Therefore, the use of integral or differential equation expressions is not necessary. In this way, a basis is created for calculating the DClink current without computationally intensive numerical integration processes or SPICE simulations. Furthermore, this paper includes the metrological verification of the novel expressions. The results discussed in this publication provide the basis for stabilizing the HV-DC system and for minimizing the DClink capacitor load. Thus, they enable the DC-link capacitor of a dual-inverter to be downsized. Based on the presented definition of the DC-link current in solved form, the possibility of real-time optimization is created. Furthermore, the results outlined in this paper form the foundation to derive the control optimization for a multi-phase inverter. Index Terms-Dual inverter, Voltage Source Inverter (VSI), phase shift, DC-link current, Newton-Cotes I. INTRODUCTIONHE need of regulating the flow of energy between two or more electrical motors or comparable AC-impedances and a DC-grid is given in many applications. Thereby, the use of a dual-inverter instead of two individual inverters often makes sense due to many reasons. An example of such an application can be found in the field of electrified vehicles. As explained in [1,2], drive concepts of HEVs (hybrid electric vehicles), BEVs (battery electric vehicles) and FCEVs (fuel cell electric vehicles) are often operated with at least two electric motors. This can be explained by the advantages of performance scalability, the potential of cost savings, driving dynamics advantages (4-wheel drive, torque vectoring), and the increase in efficiency in partial load operation. The use of dual-

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Section: Verification Of the Results Through Simulation And Calculationmentioning

confidence: 93%

Section: Analytic Rms-current Calculationmentioning

confidence: 99%

Section: Metrological Verificationmentioning

confidence: 99%

mentioning

confidence: 99%

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Analytical Calculation of the RMS Value and the Spectrum of the DC-Link Current of a Dual-Inverter

Schiedermeier

Schlamp

Rettner

et al. 2022

IEEE Trans. Power Electron.

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“…Data sheets of an HV cable and connector define only a constant root-mean-square (RMS) value for the shield current stress resistance, typically 10 A [1]. Due to the switching operation of power transistors in the traction inverter, differential mode (DM) ripple current is emitted into the HV system in the frequency range of kHz] [2,3]. Ripple current can have an amplitude of up to 40% of the useful DC current [2].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Shield Current in Automotive High Voltage Systems

Pazmany¹,

Fodor

Bäker³

2021

WEVJ

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In automotive high voltage (HV) systems, the switching operation of a power electronic converter causes current and voltage ripple in the frequency range of [10 Hz–150 kHz]. Automotive system engineering provides requirements that define the behaviour of HV components in that frequency range. Shielded HV cables must stand induced current in the frequency range of the ripple. One of the relevant requirements is the maximal current stress of the shielding. Several individually shielded cables are used in automotive HV systems, and these shields influence differential mode disturbance currents, such as the ripple current from the traction inverter. In this work, we provide a model and an analysis of shielded cables integrated into an automotive HV system in relation to system-level design parameters. To fill the gaps of existing research, we focused on two questions: How do design parameters influence the shield current value in the frequency range of the current ripple in a vehicle, and how should a shield and connector system be designed with respect to shield currents over the life-time? We applied analytical and simulative solutions to these problems through a co-simulation approach on the architecture of a real vehicle. The presented approach extends existing research by integrating simulations and vehicle measurements to life-time prediction. Moreover, the proposed methods enable the replacement of the state-of-the-art constant 10 A requirement to a driver profile based predicted shield current requirement on individually shielded HV cables in battery electric vehicles (BEV).

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Fast DC-link capacitor design for Voltage Source Inverters based on weighted total harmonic distortion

Rettner

Schiedermeier

Apelsmeier

et al. 2020

2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Voltage ripple analysis based on DC-link current harmonics for Voltage Source Inverters

Cited by 9 publications

References 7 publications

Analytical Calculation of the RMS Value and the Spectrum of the DC-Link Current of a Dual-Inverter

Analytical Calculation of the RMS Value and the Spectrum of the DC-Link Current of a Dual-Inverter

Simulation of Shield Current in Automotive High Voltage Systems

Fast DC-link capacitor design for Voltage Source Inverters based on weighted total harmonic distortion

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