Enhancement of DC-bus voltage regulation in cascaded converter system by a new sensorless load current feedforward control scheme

Majid Ali, Muhammad Yaqoob, Lingling Cao, Ka Hong Loo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

It is generally known that, with conventional PI control, the stability and dynamic response performances of a power converter cannot be optimized simultaneously. To overcome this limitation, an uncertainty and disturbance estimator assisted sensorless load current feedforward control for dc-bus voltage regulation is presented to achieve fast dynamic response to load variations while stability is guaranteed by tuning PI controller. The proposed control scheme is verified on a cascaded converters system comprising a front end dc-dc DAB converter followed by a single-phase inverter as an illustrative case. Load-current feedforward is used to enhance the transient response of the front end DAB converter while an uncertainty and disturbance estimator is used to compensate for any non-idealities arising from model uncertainties and error in load current estimation. To validate the proposed control scheme, experimental results obtained from a 250-W cascaded converter system are presented and compared rigorously to the performance of conventional PI control.

Original languageEnglish
Pages (from-to)1457-1467
Number of pages11
JournalIET Power Electronics
Volume14
Issue number8
DOIs
Publication statusPublished - 17 Jun 2021

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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