High-performance and Multi-functional Control of Transformerless Single-phase Smart Inverter for Grid-connected PV System

Highly reliable and flexible control is required for distributed generation (DG) to efficiently connect the grid. Smart inverters play a key role in integration of DG into power grid provide advanced functionalities. In this paper, an energy-based single-phase voltage-source smart inverter (SPV-SSI) 5 kVA designed analyzed detail. SPV-SSI capable supplying local load utility up rated capacity inverter, injecting grid, storing energy lead-acid battery bank, controlling voltage at point common coupling (PCC) during sags or faults, making decisions on real-time pricing information obtained from through metering. The complete design dq frame, bi-directional DC-DC buck-boost converter, IEEE standard 1547 based islanding recloser, static synchronous compensator (STATCOM) functionalities presented paper. Moreover, adaptive controllers, i.e., fuzzy proportional-integral (F-PI) controller fuzzy-sliding mode (F-SMC) are designed. performances F-PI F-SMC superior, stable, robust compared with those conventionally tuned PI controllers loop (islanded mode) current (grid-con-nected mode).