Grid-interfaced solar PV powered electric vehicle battery system with novel adaptive digital control algorithm

This study deals with the control of a three-phase grid-tied solar photovoltaic (PV) powered electric vehicle battery (EVB) system. The perturb and observe technique is used to obtain the peak power of a solar PV array. The EVB is connected through a DC-DC buck-boost converter at the DC link of voltage source converter (VSC), which is charged in base load periods and discharged at high load periods. This converter also maintains the DC link voltage to its maximum power point tracking and the EVB capacity is reduced in comparison to a system, where it is directly assimilated at the DC link. An adaptive recursive digital filter is used in an economical and efficient single-stage grid-connected solar PV-EVB system for the evaluation of the fundamental current constituent of non-linear load current, subsequently the grid current is sinusoidal and has unity power factor. The system with recursive filter control is adaptable at solar insolation variation and load change. VSC works as an active power filter under no solar power generation and compensates the load reactive power. The operation of scheme is validated with test results on a prototype developed in steady-state and dynamic conditions.