Low voltage ride through capability enhancement in a grid-connected wind/fuel cell hybrid system via combined feed-forward and fuzzy logic control

• Published in: IET generation, transmission & distribution transmission & distribution, 2019-07, Vol.13 (13), p.2866-2876
• Main Authors: Roy, Amit Kumar, Basak, Prasenjit, Biswal, Gyan Ranjan
• Format: Article
• Language: English
• Subjects: combined feed‐forward‐fuzzy logic control; current references; current regulator; dq current control; electric current control; enhanced FRT capability; feedforward; feed‐forward FRT control; feed‐forward‐based FRT control scheme; feed‐forward‐fuzzy control scheme; FRT capability; fuel cell power plants; fuel cell system; fuzzy control; fuzzy logic‐based current controllers; grid code demands; grid voltage sag tests; grid‐connected renewable energy‐based distributed energy resources; grid‐connected wind/fuel cell hybrid system; hybrid power systems; inverter control scheme; invertors; low voltage ride through capability enhancement; newly derived references; power generation control; power generation faults; power grids; power supply quality; Research Article; tracking capability; voltage source inverter; voltage‐source convertors; wind energy conversion system; wind power plants; wind turbines
• ISSN: 1751-8687; 1751-8695; 1751-8695
• DOI: 10.1049/iet-gtd.2019.0021

Fault ride through (FRT) capability is an essential practice as per the present grid code demands for grid-connected renewable energy-based distributed energy resources. Studies on FRT capability for grid-connected hybrid systems are rarely found. This study considers a wind energy conversion system and a fuel cell system interconnected at a common dc bus. It proposes a new feed-forward-based FRT control scheme for the inverter control where new current references in dq-axis frame are derived by tracking the positive sequence power. The newly derived references are fed forward to the input of the current regulator of the voltage source inverter. Second, fuzzy logic-based current controllers are suggested to improve the tracking capability of the current references in the inverter control scheme so as to enhance the FRT capability of the hybrid system as a whole. The proposed feed-forward-fuzzy control scheme for achieving an enhanced FRT capability is compared with the conventional dq current control and feed-forward FRT control for various grid voltage sag tests, where the performance of the combined feed-forward-fuzzy control is found better. The validation of the proposed FRT control scheme is performed in MATLAB-Simulink environment.