Singe-Phase Grid-Connected Inverter Based on Voltage-Oriented Control in Photovoltaic Generation Systems

Abstract

The paper proposes a new control of a transformerless singe-stage single-phase grid-connected inverter in photovoltaic generation systems. The control scheme is mainly based on voltage-oriented control (VOC) with help of second order Generalized Integrator (SOGI). A cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous dq reference frame using a decoupled feedback control. The simulated results have proven an excellent performance and verified the validity of proposed system.

Grid connected photovoltaic system efficiency and quality improvement using fuzzy-incond MPPT

“…The voltage oriented control or VOC is an indirect strategy of controlling the active and reactive power during the incorporation of micro-grids to the electrical grid. It aims at orienting the current vector regarding the line voltage vector through active and reactive current control [23]. The principal function of this method is to minimize the error between Id ,Iq (direct and quadrature parts of the measured grid current and transformed using Park Transformation) and their reference values Id-ref , Iqrefrespectively.…”

“…This technique depends on the change between stationary coordinate's αβ and synchronous rotation coordinates dq and guarantees high dynamic and static performance via an inner current loop. Details of these techniques are done in [22][23][24]. The VOC is adopted to achieve the purpose of this paper and its details are elaborated in Section 3.…”