Performance Improvement of Low Voltage Ride-Through Using Optimal Structure in DFIG

Increasing wind energy utilization and connecting high-capacity wind farms to the grid has made it necessary to study their impact on grid stability and the requirements needed to increase grid reliability. The most important generator used in wind turbine technology is DFIG. Although this generator has many advantages, such as having converters with low rating devices which leads to lower cost, there are some disadvantages associated with that excessive overcurrent during short-circuit fault due to the direct connection of the stator to the AC grid. This paper proposes a new topology and novel control method to limit the fault current, so that grid requirements are met during transient fault. Also, this novel scheme does not add any complexity and power loss to system during normal operation,