Design of Adaptive-SMC based Multifunctional Inverter under Smart Grid Initiative for Grid Tied PV System

Smart Inverters (SI) are essential for controlling and integrating distributed generation (DG) into the power grid, offering advanced functionalities. This paper successfully presents an in-depth design and analysis of a 5 kVA Single Phase Voltage-Source Smart Inverter (SPV-SSI) under the Smart Grid Initiative (SGI) of the U.S. Department of Energy. SPV-SSI combined functions include powering local loads, injecting energy into the grid, controlling the voltage at the Point of Common Coupling (PCC) during voltage sags or faults, storing energy in a bank of lead acid batteries, powering utility loads up to the inverter's rated capacity, and real-time decision-making capability through advance metering. Further, the complete design of SI in a dq-synchronous reference frame with current and voltage control loops, bidirectional DC-DC Buck-Boost converter, IEEE standard 1547 islanding and recloser, and Static Synchronous Compensator (STATCOM) functions are included in this paper. In addition, the designed Adaptive Sliding Mode Controllers (ASMC) has robust, stable, and superior performance compared with the PI controller.