Real-Time Implementation of The Fuzzy Logic Controlled Parallel Protection Technique to Enhance the DFIG System's FRT Capability

Document Type : Research Note


Maulana Azad National Institute of Technology, Bhopal, India


A hybrid strategy is proposed in this paper for wind energy systems with doubly-fed induction generators (DFIGs) to operate continuously in the event of power fluctuation and fault-related complications in order to accept significant penetration of wind energy conversion (WEC) systems into the grid by employing a fuzzy-logic controlled modified parallel protection scheme. The scheme is designed by integrating a rotor-side series dynamic braking resistor (RSDBR) topology, a DC link brake chopper (DCBC) topology, and a rotor-side parallel resistor crowbar (REPRC) topology to suppress peak rotor currents, stator currents, and DC bus voltage at faults, thus protecting the rotor-side converter, while limiting torque fluctuations during the protection process, avoiding frequent use of crowbar short circuits, extending rotor-side converter operating time, and improving fault ride-through (FRT) capability. This research article also presents various fault overcurrent scenarios (symmetrical and asymmetrical) and provides protection analysis, including switching methods, coordination with different topologies, and resistance value calculations. The effectiveness of the proposed technique is verified using a MATLAB simulation study for a DFIG system driven by a typical 1.5 MW wind turbine. The real-time simulator (RTS)-based OPAL-RT4500 effectively verifies the operation of the scheme under various fault conditions.


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