Research On The Impact Of Wind Power On Damping Characteristics Of The Power System And Its Additional Damping Controller

Due to the non-renewable nature of traditional energy sources and the destruction of the environment,China’s installed capacity of renewable energy has reached record highs and more new energy sources have brought new challenges to the stability and reliability of power grid operation.In the renewable energy power generation,the wind energy becomes the main force of the new energy power generation,the large-scale wind power accesses,reduces the inertia and the damping of the system,has great influence on the stability of the safe operation of the system,among them the low frequency oscillation is the important problem in the stability study First,in the process of building smart grid and energy Internet,this problem needs to be solved urgently.Therefore,this paper further discusses the impact of large-scale wind power on the system damping and the corresponding suppression method,which is of great practical significance.In this paper,the mathematical model of doubly fed wind turbines is introduced in detail,and the damping torque analysis method is used to derive the positive damping torque conditions of the wind farm with doubly-fed wind turbines for the single infinite system.Output power control system to provide theoretical basis for power oscillation.Then,based on the idea of data driving and using the merit of subspace identification method,this paper introduces an auto-disturbance-rejection control method to design a set of auto-disturbance rejection controller with strong practicality and no mathematical model with the controlled object.The design of the auto-disturbance-rejection controller does not need the controlled object model,but the low-order mathematical model through the identification is still in the larger error.Finally,in view of the above problems,this paper considers the function of the stator voltage phase-locked loop to establish the mathematical model of the controlled object,at the same time design the machine-side converter and passive reactive damping passive controller,combined with relevant simulation examples verify this article Design of the controller is effective.