Investigation of Fault Ride Through Capabilities of DFIG and PMSG Wind System

Abstract

Recently, wind turbines under diverse conditions and complex activity have become a core topic in grid codes. The fault ride-through (FRT) capability of wind turbines is the most significant prerequisite for national grid codes. On this basis, the wind turbine should remain connected to the grid during the grid fault to preserve the system's reliability. Furthermore, the wind turbine generator is designed with reactive power injection capability during faults. Immediately after the fault clearance, the generato provides active and reactive power to sustain grid voltage and frequency, respectively. An investigation on FRT capability of a wind turbines generator in MATLAB/Simulink is carried out in this paper to fill design gaps in ordinary wind turbines. The results show that when the PMSG and DFIG wind turbines encounter a fault, active and reactive powe react the same way in each case, i.e the active power to the grid decreases and injected reactive power increases to stabilize the system. Thus, future FRT solutions in the grid codes' active and reactive power in generation and injection are taken into consideration.