一种具有CROGI-OSG预滤波器的新型HTFIF方法用于单级SPVA系统实现平滑模式切换

This paper presents a novel hard-thresholding fast iterative filtering (HTFIF) method for a grid-tied solar photovoltaic array (SPVA) system. Through a series of iterative processes involving a filtering operation and a hard-thresholding step, this methodology effectively eliminates noise and harmonics in input signals. Core tenet of HTFIF lies in its iterative refinement approach, aimed at enhancing accuracy of original signal estimation by progressively reducing noise while preserving fundamental signal components. Effectiveness of this technique is tested during grid-connected mode (GCM) in different dynamic scenarios like grid outage, variable irradiance, and load unbalancing. A cascaded reduced order generalized integrator orthogonal signal generator (CROGI-OSG) is used as a pre-filter to eliminate harmonics in grid voltage. This system is designed to operate independently as a standalone mode (SAM) when grid is inaccessible. During SAM, a proportional resonant (PR) controller is employed to counteract oscillatory components in load voltages. Findings demonstrate seamless operation of system in both GCM and SAM, meeting specifications outlined in the IEEE-519 standard. Moreover, a smooth transition between GCM and SAM is observed where synchronization requirements are violated. Performance and efficiency of proposed control methodology with pre-filtering are assessed with computational and further validated through experimentation on a hardware setup established in the laboratory.