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Analysis of Peak-to-Peak Current Ripple Amplitude in Seven-Phase PWM Voltage Source Inverters
Department of Electrical Engineering, University of Bologna, Viale Risorgimento 2, Bologna 40136, Italy
* Author to whom correspondence should be addressed.
Received: 28 May 2013; in revised form: 19 August 2013 / Accepted: 19 August 2013 / Published: 27 August 2013
Abstract: Multiphase systems are nowadays considered for various industrial applications. Numerous pulse width modulation (PWM) schemes for multiphase voltage source inverters with sinusoidal outputs have been developed, but no detailed analysis of the impact of these modulation schemes on the output peak-to-peak current ripple amplitude has been reported. Determination of current ripple in multiphase PWM voltage source inverters is important for both design and control purposes. This paper gives the complete analysis of the peak-to-peak current ripple distribution over a fundamental period for multiphase inverters, with particular reference to seven-phase VSIs. In particular, peak-to-peak current ripple amplitude is analytically determined as a function of the modulation index, and a simplified expression to get its maximum value is carried out. Although reference is made to the centered symmetrical PWM, being the most simple and effective solution to maximize the DC bus utilization, leading to a nearly-optimal modulation to minimize the RMS of the current ripple, the analysis can be readily extended to either discontinuous or asymmetrical modulations, both carrier-based and space vector PWM. A similar approach can be usefully applied to any phase number. The analytical developments for all different sub-cases are verified by numerical simulations.
Keywords: voltage source inverter; multiphase inverter; multiple space vectors modulation; carried-based modulation; peak-to-peak current ripple; current ripple distribution
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MDPI and ACS Style
Grandi, G.; Loncarski, J. Analysis of Peak-to-Peak Current Ripple Amplitude in Seven-Phase PWM Voltage Source Inverters. Energies 2013, 6, 4429-4447.
Grandi G, Loncarski J. Analysis of Peak-to-Peak Current Ripple Amplitude in Seven-Phase PWM Voltage Source Inverters. Energies. 2013; 6(9):4429-4447.
Grandi, Gabriele; Loncarski, Jelena. 2013. "Analysis of Peak-to-Peak Current Ripple Amplitude in Seven-Phase PWM Voltage Source Inverters." Energies 6, no. 9: 4429-4447.