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.

Analytical evaluation of output current ripple amplitude in three-phase three-level inverters / Grandi, Gabriele; Loncarski, Jelena; Dordevic, Obrad. - In: IET POWER ELECTRONICS. - ISSN 1755-4535. - STAMPA. - 7:9(2014), pp. 2258-2268. [10.1049/iet-pel.2013.0837]

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

Jelena Loncarski;
2014-01-01

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.
2014
Analytical evaluation of output current ripple amplitude in three-phase three-level inverters / Grandi, Gabriele; Loncarski, Jelena; Dordevic, Obrad. - In: IET POWER ELECTRONICS. - ISSN 1755-4535. - STAMPA. - 7:9(2014), pp. 2258-2268. [10.1049/iet-pel.2013.0837]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/207471
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