Dual-inverter control synchronization strategy to minimize the DC-link capacitor current

Schiedermeier, Maximilian; Rettner, Cornelius; Steiner, M; März, Martin

doi:10.1109/vppc49601.2020.9330921

Cited by 2 publications

(6 citation statements)

References 9 publications

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“…The representation of this dependency lays the foundation for a real-time capable optimization of the switching cycle shift of the dual-inverter. A reduction of , , by more than 40 % for the straight-ahead driving of a vehicle by using an operating point-dependent switching cycle shift has already been proven in [11]. Due to (41) a highperformance optimization option for the entire operating area is now available.…”

Section: Discussionmentioning

confidence: 99%

“…To get an analytical spectrum of the switch current, all six sectors of the hexagon are integrated. However, the integration over two sectors is sufficient for the spectrum 1 ( ), since this signal has a 2 /3-periodicity according to [5,6,11]. For this reason, the functions ~, ~ and ~ are introduced.…”

Section: A Description Of the Current Spectrum As An Integral Functionmentioning

confidence: 99%

“…This parameter would have to be adjusted for the analysis of discontinuous modulation strategies. The variable 1 represents the modulation index of Inverter1 and is defined according to (11).…”

Section: Definition and Parameter Introductionmentioning

confidence: 99%

“…The variable 2 represents the modulation index of Inverter2 and is defined analogously to (11). Furthermore, the time…”

Section: Definition and Parameter Introductionmentioning

confidence: 99%

“…In contrast to [7], the frequency spectrum of the current is not described for a single-but for a dual-inverter. In addition to the explanations in [4,[8][9][10][11], the description of the spectrum is presented in a solved form. Therefore, a numerical integration for determining the DC-link current for any operating point of the dual-inverter becomes obsolete.…”

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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: Discussionmentioning

confidence: 99%

Section: A Description Of the Current Spectrum As An Integral Functionmentioning

confidence: 99%

Section: Definition and Parameter Introductionmentioning

confidence: 99%

“…The variable 2 represents the modulation index of Inverter2 and is defined analogously to (11). Furthermore, the time…”

Section: Definition and Parameter Introductionmentioning

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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Calculation of RMS Current Load on DC-Link Capacitors for Multiphase Machine Drives under Carrier-Phase Shift Control

Zhang

et al. 2023

Journal of Control Science and Engineering

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The reliability and economy of dc-link capacitors are important concerns in multiphase drive systems. Due to the parallel connection of several converters, the dc-link capacitors are subjected to a higher RMS current, and the root mean square (RMS) current of dc-link capacitors is an important reference standard to determine its lifetime, cost, and volume. In this paper, the RMS current of dc-link capacitor is calculated by using the dual Fourier integral method and the effect of carrier interleave is studied. Meanwhile, the modulation ratio, harmonic sidebands, and switching frequency are also considered. In order to optimize the reliability and economy of the multiphase drive system, a Cotes method combined with carrier-phase shifting technology (CPST) for calculating RMS current of the dc-link capacitor is proposed. The proposed method can provide optimization guidance for the design of dc-link capacitors. Finally, the analytical and experiment results are compared with the existing methods, and the experimental results verify the effectiveness of the proposed method.

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Dual-inverter control synchronization strategy to minimize the DC-link capacitor current

Cited by 2 publications

References 9 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

Calculation of RMS Current Load on DC-Link Capacitors for Multiphase Machine Drives under Carrier-Phase Shift Control

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