An adaptive voltage control strategy of three-phase inverter for stand-alone distributed generation systems

Ton Duc Do, Viet Quoc Leu, Young Sik Choi, Han Ho Choi, Jin Woo Jung

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

This paper proposes an adaptive control method of three-phase inverters for stand-alone distributed generation systems (DGSs). The proposed voltage controller includes two control terms: an adaptive compensating term and a stabilizing term. The adaptive compensating control term is constructed to avoid directly calculating the time derivatives of state variables. Meanwhile, the stabilizing control term is designed to asymptotically stabilize the error dynamics of the system. Also, a fourth-order optimal load current observer is proposed to reduce the number of current sensors and enhance the system reliability and cost effectiveness. The stability of the proposed voltage controller and the proposed load current observer is fully proven by using Lyapunov theory. The proposed control system can establish good voltage regulation such as fast dynamic response, small steady-state error, and low total harmonic distortion under sudden load change, unbalanced load, and nonlinear load. Finally, the validity of the proposed control strategy is verified through simulations and experiments on a prototype DGS test bed with a TMS320F28335 DSP. For a comparative study, the control scheme of feedback linearization for multi-input and multioutput is implemented, and its results are presented in this paper.

Original languageEnglish
Article number6365812
Pages (from-to)5660-5672
Number of pages13
JournalIEEE Transactions on Industrial Electronics
Volume60
Issue number12
DOIs
Publication statusPublished - Jan 1 2013

Keywords

  • Adaptive control
  • distributed generation (DG) system (DGS)
  • load current observer
  • stand-alone
  • three-phase inverter
  • voltage control

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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