Open AccessCurrent limitation for the machine side converter of permanent magnet synchronous generator wind turbines during grid faults
Author(s) -
Nasiri Mojtaba,
Arzani Ali,
Savaghebi Mehdi
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2019.1246
Subject(s) - low voltage ride through , controller (irrigation) , permanent magnet synchronous generator , grid code , grid , wind power , fault (geology) , voltage , computer science , electrical engineering , automotive engineering , fault current limiter , ac power , engineering , power (physics) , electric power system , physics , quantum mechanics , geology , agronomy , geometry , mathematics , seismology , biology
Preservation of wind turbines (WTs) grid‐connectivity during grid faults and grid‐code (GC) compliant reactive power injection at PCC during voltage drops is an imperative task to perform in modern WTs. This is known as the low‐voltage ride‐through (LVRT) capability of WTs, emerging as an integral GC requirement. Despite current provision of LVRT in PMSG‐based WTs, there is still likelihood of grid voltage drops leading to adverse effects in wind power plants. In this research, a peak current limiter has been designed for machine‐side converter (MSC) of the PMSG‐based WT to execute GC requirements in a reliable manner. This scheme is capable of preventing over‐voltage across the dc link of back‐to‐back (BTB) converter and over‐current in the grid‐side converter (GSC). A dual current controller is utilised for regulating GSC positive‐ and negative‐sequence components. A prominent feature of the proposed controller is its simplicity and applicability to available BTB control systems. On the other hand, the WT mechanical system operates as a storage device during voltage drops, eliminating the need for installing external apparatus such as energy storage systems and braking choppers across the dc‐link. Simulation results conclude the reliable operation of the WT equipped with MSC current limitation scheme during grid faults.