Fault ride-through enhancement of wind energy conversion system adopting a mechanical controller

摘要

In recent years, wind has become the fastest growing energy source in the electrical power generation. A large amount of electric power is generated from wind, has a great significance in the electric power generation. On the occurrence of any disturbance leads to power imbalance as well as rotor over speeding, consequence is the disconnection of the wind energy conversion system (WECS). This disconnection degrades the voltage restoration and violates the entire stability of the system. The Current grid codes, demand the wind energy system to ensure fault ride through (FRT) ability and contributing network stability. This paper proposed a novel control algorithm to satisfy the grid code requirement. The Proposed controller, forces the WECS to operate away from maximum power point (MPP) during fault condition to reduce the percentage of extracted mechanical power. This reduction in mechanical power assists the stability improvement and suppresses wind generator acceleration. During the normal operating condition, control algorithm forces the gearbox controller to operate at maximum power point to enhance the efficacy of system. This technique is more practical, highly feasible and economically attractive solution compared to other fault ride through technique. The effectiveness of the proposed algorithm is verified by taking different wind speed and gearbox ratio (GB) for squirrel cage based fixed speed induction generator(FSIG). Simulations are carried out using MATLAB/Simulink environment.