P.Kartheesh
PG student- Department of ECE – SBM college of
Engineering and technology, Dindigul, Tamilnadu, India
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 multi output is implemented, and
its results are presented in this paper.
