Adaptive Generalized Predictive Control Scheme for Single Phase GPV System

Abstract

This paper proposes an adaptive generalized predictive controller (GPC) for single phase grid connected photovoltaic (GPV) system to ensure smooth active and reactive power control. Contrary to most other linear controllers, this non-linear adaptive control strategy offers quick stabilization of system parameters under variety of stochastic changes that occur in practical photovoltaic systems such as solar insolation changes, grid frequency changes, rapid perturbations in linear/nonlinear/induction motor loads. The developed controller has capability of providing smooth steady state and dynamic responses under such disturbances. The mathematical derivation of the controller is depicted and simulation results are provided to validate the effectiveness of the proposed control strategy. The comparative analysis depicts superior performance of the proposed controller, in comparison with linear power control strategy. With linear controllers, the injected active power is prone to constant fluctuations caused by different perturbation in solar PV system, thereby, resulting in corresponding fluctuations in DC link voltages, which increase the failure rate of electrolytic capacitors and the proposed control strategy serves as possible solution to handle the stochastic changes in PV system.