Predictive direct power control for dual-active-bridge multilevel inverter based on conservative power theory

Bohari, Azuwien Aida and Goh, Hui Hwang and Tonni, Agustiono Kurniawan and Lee, Sze Sing and Sim, Sy Yi and Goh, Kai Chen and Lim, Chee Shen and Luo, Yi Chen (2020) Predictive direct power control for dual-active-bridge multilevel inverter based on conservative power theory. Energies, 13 (11). pp. 1-14. ISSN 1996-1073

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Abstract

This paper explores the feasibility of multilevel dual-active bridge-inverter (DABMI) applications for grid-connected applications of a modern Model of Predictive Direct Power Control (MPDPC) based on the conservative power theory (CPT). In the case of unbalanced grid voltages, the objective of the study is to promote continued active and reactive energy in MPDPC without reducing effciency such as transient response and current harmonics. The nature of the instantaneous p-q theory permits only one out of three control targets to be fulfilled. The proposed control approached directly regulates the instantaneous active and reactive power to achieve three particular control objectives namely sinusoidal and symmetrical grid current, cancelling twice of fundamental grid frequency reactive power ripples, and removing twice grid frequency active power ripple. The techniques of complicated Grid part sequence extraction are unnecessary and improved at no extra expense, as is the case with current MPDPC fault-tolerant approaches. The instantaneous power at the next sampling instant is predicted with the newly developed discrete-time model. Each possible switching state will then be evaluated in the cost function defined until the optimal state which lead to the minimum power errors is determined. In MATLAB/Simulink simulation, the proposed CPT-based MPDPC measures reliability and performance at balanced and unbalanced grid voltages then compared with the conventional and existing MPDPC The proposed method manages to achieve all of three control targets which generates sinusoidal grid currents and attenuates active and reactive power ripple of twice the grid frequency exactly at the same time without losing its critical effciency including transient reaction and current harmonics.

Item Type:	Article
Uncontrolled Keywords:	unbalanced grid voltage; multilevel inverter; grid-connected application
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions:	Faculty of Engineering Technology > Department of Electrical Engineering Technology
Depositing User:	Miss Afiqah Faiqah Mohd Hafiz
Date Deposited:	30 Jan 2022 08:25
Last Modified:	30 Jan 2022 08:25
URI:	http://eprints.uthm.edu.my/id/eprint/6389

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