Reactive Power Support Strategy for Low Voltage Ride Through Based on Sensitivity Analysis

The traditional low voltage ride through (LVRT) control method is mainly adjusted from the inside of the new energy field station. Generally, by improving the Crowbar circuit or optimizing the excitation control of the converter, the renewable energy can be operated without offline at a low voltage and reduce its reactive power absorption to the system. Based on the current LVRT status, this paper proposes a DFIG control strategy during LVRT, and introduces the sensitivity coefficient to calculate the influence factor of the wind farm on the faulty node in the regional network to optimize the reactive power distribution of the wind farm near the faulty node. This stable working state of DFIG during LVRT speeds up the recovery speed of the system after it breaks away from the fault. The simulation analysis on the Yunnan regional power grid verifies the feasibility and superiority of the theory, and provides a new idea for the control strategy of renewable energy during LVRT.