Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Nonlinear Adaptive Control and Stability Analysis for Improving Transient Response of Photovoltaic Converter Systems

태양광 컨버터 시스템의 과도응답 개선을 위한 비선형 적응제어 및 안정성 해석

  • 조현철 (울산과학대학 전기전자학부) ;
  • 유수복 (울산과학대학 전기전자학부) ;
  • 이권순 (동아대학교 전기공학과)
  • Published : 2009.12.01
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Abstract

In photovoltaic(PV) generator systems, DC-DC converters are significantly considered for control system performance in power quality point of view. This paper presents a novel adaptive control method for DC-DC converters applied in PV generator systems. First, we derive a state-space average model of the converter system and then propose a reset control methodology to enhance transient response performance for time-varying PV systems. For estimating parameters of a reset control, a gradient descent optimization is utilized and an adjustment rule of them are derived respectively. An objective of the optimization is that characteristic equation of an augmented system model which is formed with an converter system model and an reset control is to trace a predefined polynomial given as a reference characteristic model. Next, we accomplish stability analysis by means of a well-known Lyapunov theory for nonlinear converter systems including time-varying voltage excitation from a PV generator. Numerical simulation demonstrates reliability of our control methodology and its superiority by comparison to a traditional control strategy.

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