Voltage Observer-Based Control for Single-Phase Grid-Connected PV Inverter

This article introduces the solar-array voltage observer-based control system for single-phase single-stage grid-tied H-bridge PV inverter. Such a state observer on-line estimating solar-array voltage is intended to supersede a solar-array voltage sensor. This voltage observer is fashioned into switched linear observer because switched linear system is intrinsic to the PV inverter plant. After the overall control system is validated, the voltage observer will provide exact performance of solar-array voltage estimation in comparison with the actual voltage. When the replacement of the sensor by the observer is available, simulation results indicate possibility of the voltage-sensorless control scheme.