Detecting and Fault Ride-Through (FRT) in the power system with wind, solar and electric energy storage renewable sources

The proposed structure of this article is a hybrid wind-solar-storage system with fault tolerance that reduces output power fluctuations and voltage drop in the system caused by faults. In the proposed topology, the solar system is connected to the DFIG through a DC-DC converter, thus eliminating the need for a special inverter for the solar system and reducing the cost. The power management in this system is done using the converters of the rotor section and the DC-DC controller related to the DC link using the phased method, which is why there is no need to use a compensator in the system. The better the control system works, the better and sooner the fault detection and compensation will be done, and this will prevent the system from being damaged and unstable, and will not cause serious damage to the system. In this thesis, the simulation results for two scenarios were investigated. In both scenarios, the active power decreases during 0.3 seconds when a sudden voltage drop occurs, but the reactive power increases due to the compensation of the created error. With the occurrence of an error and a sudden voltage drop in the system, the wind turbine has not reached an unstable state and a sudden increase in torque has not occurred, and the control system has worked well. Therefore, in this research, the proposed system was able to perform fault detection and voltage drop compensation through DC link voltage stabilization and reactive power injection in order to improve the voltage drop. It should be noted that all simulations were done in MATLAB/Simulink software.