A Novel Assorted Nonlinear Stabilizer for DC-DC Multilevel Boost Converter with Constant Power Load in DC Microgrid

Xiangke Li, Xinan Zhang, Wentao Jiang, Junjun Wang, Peng Wang, Xiaohua Wu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The multilevel boost converter (MBC) has been widely adopted in the dc microgrid systems due to its high voltage gain and simple structure. In recent years, the power electronic loads, which usually behave as constant power loads (CPLs), are penetrating in microgrids. The incremental negative impedance of CPLs degrades the stability of microgrid systems. To ensure effective power flow and guarantee system stability, eliminating the undesired effects of CPLs is a necessity. In this article, a novel assorted nonlinear stabilizer, which is integrated with an extended nonlinear disturbance observer (NDO) and an adaptive backstepping controller, is proposed for stabilizing the MBC-fed microgrid system with CPLs. First, the reduced-order MBC model is transformed into the Brunovsky's canonical form using the exact feedback linearization technique. Second, owing to the NDO, fast system dynamic responses are achieved. Using the estimations of NDO, an adaptive backstepping controller is developed to strictly guarantee the microgrid bus voltage stability in the sense of a large signal. Simulation and experiment results are presented to verify the effectiveness and feasibility of the proposed stabilizer.

Original languageEnglish
Article number9026764
Pages (from-to)11181-11192
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume35
Issue number10
DOIs
Publication statusPublished - Oct 2020

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