SOGI Based Three Phase G2V, V2G Technology

The increase in electric vehicle mobility has facilitated the development of grid-to-vehicle (G2V) and vehicle-to-grid (V2G) technologies. These technologies enable bidirectional power flow between the grid and electric vehicle batteries. This paper presents a second-order generalized integrator (SOGI) filter-based bi-directional voltage source converter (VSC) with a PI-based bi-directional DC-DC converter. The proposed system ensures smooth power flow during V2G and G2V operations while maintaining power quality indices. The total harmonic distortion (THD) stays within the permissible limits defined by standards like IEEE 519. A sample-and-hold circuit is employed to estimate the fundamental component of the load current, contributing to grid synchronization across all operating modes. Additionally, the transition between V2G and G2V modes is achieved seamlessly.