Research on Low Voltage Ride Through Control Strategy of Wind Power Grid-connected Inverter

In order to improve the operating stability and low voltage ride through (LVRT) ability of wind power system, this paper studies the control strategy of voltage source grid-connected inverter of doubly-fed wind power system. First of all, the main functions of grid-connected inverter in wind power system are analyzed, and the research status and unsolved problems of wind power grid-connected inverter control technology at home and abroad are discussed. Secondly, this paper introduces the basic principle of the first-order linear active disturbance rejection control (LADRC) technology. Then, On the basis of the double closed-loop proportion integration (PI) controller model, the voltage outer loop is improved based on the first order active disturbance rejection strategy. Finally, the steady-state and symmetrical voltage drop conditions are studied through the simulation model, and the voltage and current waveforms of the power grid are analyzed to verify the practicability and low voltage crossing ability of the first-order linear active disturbance rejection control technology.