Predictive Control of a 27-level Asymmetric Multilevel Current Source Inverter

Muñoz, Javier; Soto, Bairon; Villalon, Ariel; Rivera, Marco; Cossutta, Pablo; Aguirre, Miguel Pablo

doi:10.1109/eeeic.2018.8493715

Cited by 2 publications

(1 citation statement)

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“…Although this strategy has been well studied by the scientific community [23,26], with developments of various applications for multilevel converters [27,28], it is still possible to find new improvements in both its optimization and its application to multi-variable systems. Thus, this article aims to optimize the application of predictive control in multilevel topologies, reducing undesired commutations in the high-power cell, to avoid switching losses.…”

Section: Introductionmentioning

confidence: 99%

Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

et al. 2020

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This article proposes a 27-level asymmetric cascade H-bridge multilevel topology for photovoltaic applications, which considers a predictive control strategy that allows minimization of the commutations of the converter. This proposal ensures a highly sinusoidal and stable photovoltaic injection when there are solar irradiance disturbances, generating a low distortion in the current waveform and low switching losses. To validate the performance of the control and the proposed topology, the dynamic model of the alternating current (AC) and direct current (DC) side system is first obtained, which is checked by computational simulations. Subsequently, the implementation of a master–slave control is carried out, focused on the control of DC voltage and AC current. The proposal is simulated, and the total harmonic distortion (THD) is obtained in the voltage and current waveforms. Undesired commutations, typical of the predictive control, are eliminated in the AC voltage waveform, and a proper DC voltage tracking is achieved for the high-power cell. In order to demonstrate the performance of the proposed control strategy, a low-power proof-of-concept prototype is implemented, in which the energy is injected to the grid, under the event of solar irradiance disturbances (with DC control).Then, the undesired switching in the main cell is eliminated, generating THDs in the voltage and current signal of 7.76% and 2.65%, respectively.

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