PERFORMANCE ANALYSIS OF SINGLE PHASE BOOSTING INVERTER FOR GRID CONNECTED PV SYSTEM

ELECTRICAL ENGG.

Abstract – This paper presents a new nonlinear current control scheme for a single-phase grid-connected photovoltaic (PV) system. Partial feedback linearization is used for designing the controller, which linearizes the system partially and enables the controller design scheme for reduced-order PV systems. The proposed current control approach introduces the internal dynamics and the stability of the internal dynamics is a key requirement for the implementation of the controller. Based on the tracking of grid current to the reference current, the performance of the controller is evaluated by considering the changes in environmental conditions. A large system similar to a practical system is simulated under different operating conditions. In this paper a conventional hysteresis controller performance is compared with the non linear current controller. All the possible nonlinearities are very well canceled by the proposed controller designed approach by transforming the PV system into a reduced order linear system with stable internal dynamics.

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