Test and Analysis of Low Voltage Ride-through ...

With the increasing penetration rate of wind power in power system, the mutual influence between wind power and electric power system is more and more severe, the power system make mandatory requirements for grid-connected wind turbines can operate uninterruptedly under grid faults. In this paper, field testing characteristic of low voltage ride-through (LVRT) for directly driven permanent magnet synchronous generator (PMSG) in Inner Mongolia power grid is analyzed. Movable LVRT test device, adopted by the test program, which based on the principle of impedance differential voltage, is introduced. Test results show that the wind turbines in the wind field meet the requirements of state grid enterprise standard for LVRT ability. In the process of the voltage sag test, wind turbines can operate uninterruptedly and guarantee the power grid operate safely and stably, the stability and the security of system is thus enhanced.