CONTROL STRATEGY FOR GRID-CONNECTED PV SYSTEM UNDER MISMATCHED CONDITIONS

Abstract

A transformerless single-phase PV inverter that is connected to the grid is the subject of this article. Regardless of the weather, it is capable of operating in either buck or boost mode and extracting the maximum amount of power from two subarrays that are connected in series. The inverter's dual buck and boost modes facilitate subarray assembly by connecting solar PV modules in series. Under specific weather conditions, the power output of the subarray is enhanced. The inverter's design and control system wholly eliminate high-frequency common mode voltage components. Due to this, solar panels continue to discharge current. It also performs well in all of its operations. Through an exhaustive examination of the system, a mathematical model results. The notion's feasibility is demonstrated through a multitude of modeling studies. The concept's feasibility is illustrated by the development and evaluation of a 1.5 kW laboratory prototype. Inclement weather, transformerless, boost, and buck solar inverters, grid-tied single-phase, and series-connected modules, as well as maximum power point tracking.