WSEAS Transactions on Systems and Control
Print ISSN: 1991-8763, E-ISSN: 2224-2856
Volume 11, 2016
Nonlinear Differential Flatness Control of a Distributed PV-ES DC Generation System
Authors: , ,
Abstract: To overcome the intermittency problem, this paper proposes a novel nonlinear differential flatness control method for a distributed photovoltaic-energy storage (PV-ES) DC generation system. For high-power applications, four-phase parallel boost converters and four-phase parallel bidirectional converters are implemented as a PV converter and a storage device, respectively. For PV four-phase parallel boost converters, an improved extremum seeking algorithm is designed to achieve maximum power point tracking (MPPT) control and to satisfy the dynamic behavior of the system. For ES four-phase parallel bidirectional converters, an original nonlinear control law based on the flatness principle is proposed, which smoothes the output power and enhances the system stability under a load mutation or control parameter perturbation. To validate the proposed method, simulations are realized by simulation results in MATLAB/Simulink.
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Keywords: Distributed PV-ES DC generation system, Four-phase parallel converters, Extremum seeking algorithm, Nonlinear differential flatness control, Stabilization analysis
Pages: 53-61
WSEAS Transactions on Systems and Control, ISSN / E-ISSN: 1991-8763 / 2224-2856, Volume 11, 2016, Art. #8