An Adaptive Voltage Control Strategy of Three- Phase Inverter for Standalone Distributed Generation Systems
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Date
2012
Authors
Do, Ton Duc
Leu, Viet Quoc
Choi, Young-Sik
Choi, Han Ho
Jung, Jin-Woo
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Journal ISSN
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Abstract
This paper proposes an adaptive control method of
three-phase inverter for standalone 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. 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 (THD)
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 testbed
with a TMS320F28335 DSP. For a comparative study, the
feedback linearization for multi-input and multi-output (FLMIMO)
control scheme is implemented and its results are
presented in this paper
Description
Keywords
Adaptive control, distributed generation system (DGS), load current observer, standalone, three-phase inverter, voltage control
Citation
Ton Duc Do, Viet Quoc Leu, Young-Sik Choi, Han Ho Choi, Jin-Woo Jung; 2013; An Adaptive Voltage Control Strategy of Three- Phase Inverter for Standalone Distributed Generation Systems; IEEE