Comprehensive Spectral Analysis of PWM Waveforms With Compensated DC-Link Oscillations

Milovanović, Stefan; Dujić, Dražen

doi:10.1109/tpel.2020.2996418

Cited by 4 publications

(1 citation statement)

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“…Subsequently, modifications to the double Fourier method as well as alternative methods evolved, characterizing the PWM output spectrum [10]. Special emphasis was given to incorporating modulator input signals that contain multiple frequency components [5,[11][12][13] and dc-link voltage oscillations [14,15]. Because the interaction of the signals within the power stage of the plant and the influence of the closed-loop control system are not examined, the research question arises of how to integrate these interactions.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Domain Modeling of Harmonic Interactions in Voltage-Source Inverters with Closed-Loop Control

John

Mertens

2020

Energies

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Power electronic converters, together with their loads, sources, and controls, form a coupled system that includes many nonlinear interactions, for instance due to pulse-width modulation (PWM) and feedback control. In this paper we develop a complete, nonlinear modeling approach for voltage-source inverters in the frequency domain, taking into account the harmonic components introduced into the system from the inputs and from the nonlinear digital PWM. The most important contribution is a method for analyzing how these harmonics propagate through the nonlinear system in steady state. To enable this, an analytic model of PWM with arbitrary, multiple-frequency input is necessary. A revised model of Asymmetrical regularly-sampled double-edge PWM (AD-PWM) is proposed and its incorporation into the system model regarding sampling effects is discussed. The resulting nonlinear equation system is numerically and simultaneously solved, yielding the spectra of all relevant signals in the converter. The results are validated with time-domain simulations and with measurements, proving the effectiveness of the proposed approach.

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