Transient Overvoltage Analysis and Rapid Estimation for Hybrid Wind-Thermal Power Bundling Supply System

Abstract

In view of the problem that the transient overvoltage caused by AC fault is difficult to calculate quickly in the hybrid wind-thermal power bundling supply system, resulting in the safe and stable operation of the system, a fine and fast estimation method of transient overvoltage in the hybrid wind-thermal power bundling supply system is proposed. Therefore, this paper first establishes the supply side equivalent model of the hybrid wind-thermal power bundling supply system. At the same time, considering the regulation ability of the energy storage to the hybrid wind-thermal power bundling supply system, the supply side system is improved and the transient overvoltage after fault is corrected. The dynamic changes of active power and reactive power of fan under fault are analyzed, and the calculation flow of transient overvoltage suitable for hybrid wind-thermal power bundling supply system is given. On this basis, the variation law of parameters during transient overvoltage is analyzed, and a fast estimation method of transient overvoltage of hybrid wind-thermal power bundling supply system is proposed by using parameter identification method. Finally, a simulation model is established based on the data of a local AC transmission system. The simulation results verify that the proposed method can improve the calculation accuracy and convergence speed of transient overvoltage in the hybrid wind-thermal power bundling supply system.