Open AccessDisturbance attenuation control for LVRT capability enhancement of doubly fed wind generators
Author(s) -
Qin Boyu,
Zhang Ruowei,
Li Hengyi,
Ding Tao,
Liu Wansong
Publication year - 2021
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/gtd2.12200
Subject(s) - control theory (sociology) , low voltage ride through , controller (irrigation) , crowbar , rotor (electric) , overcurrent , computer science , voltage , grid , linearization , ac power , engineering , control (management) , nonlinear system , mathematics , electrical engineering , physics , artificial intelligence , agronomy , geometry , quantum mechanics , biology
Low voltage ride through (LVRT) requires wind generation systems (WGS) to maintain continuous operation and provide reactive power support under grid voltage dips. This paper proposes a novel disturbance attenuation control (DAC) approach based on state‐dependent Riccati equation (SDRE) technique to enhance the LVRT capability of doubly fed induction generator‐based (DFIG‐based) WGS. The DAC problems are formulated with the control objectives for rotor side converter and grid side converter, and the weighing matrices are designed with fully studied principles to balance the control effect and cost. The SDRE technique is adopted to solve the DAC problems, and an alternative feasible state dependent coefficient construction algorithm is applied to improve computational efficiency. An active Crowbar circuit with overcurrent limiting mechanism is applied to ensure the rotor current and DC link voltage within the secure zone. Comparisons with conventional PI controller, exact linearization controller and coordinated control strategy are performed, the results demonstrate the proposed DAC approach has a better transient performance and enhances the LVRT capability of DFIG‐based WGS.