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Analytical evaluation of output current ripple amplitude in three-phase three-level inverters.

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Title: Analytical evaluation of output current ripple amplitude in three-phase three-level inverters.
Authors: Grandi, Gabriele1 gabriele.grandi@unibo.it, Loncarski, Jelena2, Dordevic, Obrad3
Source: IET Power Electronics (Wiley-Blackwell). 2014, Vol. 7 Issue 9, p2258-2268. 11p. 2 Diagrams, 2 Charts, 9 Graphs.
Subjects: Electric currents, Ripple (Computer network protocol), Electromagnetic interference, Pulse width modulation inverters, Direct currents
Abstract: Nowadays, three-phase multilevel inverters are widely employed in medium and high-power applications, increasing the power ratings, improving the output voltage quality and reducing the conducted electromagnetic interferences. Despite of numerous pulse-width modulation (PWM) techniques have been developed for multilevel inverters, a detailed analysis of the output current ripple amplitude has not been reported yet. In this study, the peak-to-peak current ripple distribution over a fundamental period is analysed in details specifically for three-level three-phase voltage source inverters for both motor-load and grid-connected applications. In particular, the peak-to-peak amplitude of the current ripple is determined analytically as a function of the modulation index. The centred PWM strategy is considered in all the developments, implemented either by carrier-based or space vector (SV) PWM methods. With this modulation, the dc bus utilisation is maximised in a simple and effective way, and a nearly-optimal behaviour is obtained to minimise the current ripple rms. The results obtained in different cases and sub-cases identified in the proposed analytical approach are verified by experimental tests with reference to threephase three-level neutral-point clamped configuration. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Nowadays, three-phase multilevel inverters are widely employed in medium and high-power applications, increasing the power ratings, improving the output voltage quality and reducing the conducted electromagnetic interferences. Despite of numerous pulse-width modulation (PWM) techniques have been developed for multilevel inverters, a detailed analysis of the output current ripple amplitude has not been reported yet. In this study, the peak-to-peak current ripple distribution over a fundamental period is analysed in details specifically for three-level three-phase voltage source inverters for both motor-load and grid-connected applications. In particular, the peak-to-peak amplitude of the current ripple is determined analytically as a function of the modulation index. The centred PWM strategy is considered in all the developments, implemented either by carrier-based or space vector (SV) PWM methods. With this modulation, the dc bus utilisation is maximised in a simple and effective way, and a nearly-optimal behaviour is obtained to minimise the current ripple rms. The results obtained in different cases and sub-cases identified in the proposed analytical approach are verified by experimental tests with reference to threephase three-level neutral-point clamped configuration. [ABSTRACT FROM AUTHOR]
ISSN:17554535
DOI:10.1049/iet-pel.2013.0837