Abstract
Maximum power point tracking (MPPT) plays an important role in increasing the efficiency of a wind energy conversion system (WECS). In this paper, three conventional MPPT methods are reviewed: power signal feedback (PSF) control, decreased torque gain (DTG) control, and adaptive torque gain (ATG) control, and their potential challenges are investigated. It is found out that the conventional MPPT method ignores the effect of wind turbine inertia and wind speed fluctuations, which lowers WECS efficiency. Accordingly, an improved adaptive torque gain (IATG) method is proposed, which customizes adaptive torque gains and enhances MPPT performances. Specifically, the IATG control considers wind farm turbulences and works out the relationship between the optimal torque gains and the wind speed characteristics, which has not been reported in the literature. The IATG control is promising, especially under the ongoing trend of building wind farms with large-scale wind turbines and at low and medium wind speed sites.
Highlights
Wind power generation, as an important clear energy resource of modern power grids, has been developing rapidly over the past several years [1,2,3,4,5,6,7,8,9,10,11,12,13,14]
The proposed improved adaptive torque gain (IATG) control is tested through simulation, and its performances are compared with the conventional adaptive torque gain (ATG) control
Maximum power point tracking (MPPT) Algorithms ηfavg pfavg ηmax f avg MPPT plays a critical role in enhancing wind energy conversion system (WECS) efficiency
Summary
As an important clear energy resource of modern power grids, has been developing rapidly over the past several years [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. It is reported that the global wind power capacity increased from 370 GW in 2014 to 432 GW in 2015, representing a 17% annual growth rate [15]. Maximum power point tracking (MPPT) plays a decisive role in WECS efficiency. It was reported in 2004 that more than 50% of annual power capacity of a typical wind turbine came from MPPT [18,19]
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