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Evaluation of DC-link voltage ripple in seven-phase PWM voltage source inverters

Vujacic, M, Hammami, M, Dordevic, O and Grandi, G (2019) Evaluation of DC-link voltage ripple in seven-phase PWM voltage source inverters. In: 2018 IEEE International Telecommunications Energy Conference (INTELEC) . (in Proc. International Telecommunications Energy Conf. INTELEC, 07 October 2018 - 11 October 2018, Turin, Italy).

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Abstract

The analysis of dc-link inverter current and voltage ripple is important for the optimization of the input components, mainly the dc-link capacitor. In this paper reference is made to two-level seven-phase PWM voltage source inverters with balanced load, typically multiphase ac motors. The peakto-peak amplitude of the dc-link voltage switching ripple within the fundamental period is analytically determined as a function of operating conditions: modulation index, output currents amplitude and phase angle. The maximum of voltage switching ripple is also derived in order to design the dc-link capacitor. The two most popular inverter modulation techniques are considered: sinusoidal PWM and centered PWM (CPWM, equivalent to space vector modulation, SVM). A comparison between them is made in terms of the dc voltage switching ripple envelope. Numerical simulations are carried out by Matlab/Simulink in order to verify the analytical results.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Voltage Source Inverters; Seven-Phase Systems; Dc-bus Voltage Ripple; Dc-link Capacitor
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Electronics and Electrical Engineering
Publisher: IEEE
Date Deposited: 12 Feb 2019 11:20
Last Modified: 12 Feb 2019 11:20
URI: http://researchonline.ljmu.ac.uk/id/eprint/10151

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