Advanced multi-sector P&O maximum power point tracking technique for wind energy conversion system

摘要

This article suggests a new solution for the limitations of conventional fixed step-size perturb and observe (PO) maximum power point tracking (MPPT) of the wind energy conversion systems (WECSs). The proposed algorithm offers a new fast MPPT technique and it keeps the controller searching in the correct region on the power-speed curve. For this issue, a variable-step perturb and observe (VS-PO) MPPT technique based on multisector operation is proposed. The proposed technique divides the operating region into four sectors by comparing the power-speed curve and a special synthesized curve. Hence, the selection of the appropriate step-size is related to the operating sector. For the two sectors close to the maximum power point (MPP), a small step-size is applied. Otherwise, the controller utilizes a large step-size. The large-scale grid-tied WECS is composed of the back-to-back (BTB) converter. The BTB converter is divided into dual sides; the machine side converter and the grid side converter. The proposed technique has been validated over a large scale of 1.5 MW grid-tied PMSG-WECS using MATLAB/SIMULINK. The results prove the efficient operation of the proposed technique based on the improved efficiency and the fast system response compared to conventional P&O techniques.