标题：The influence of VFTO on SCSR windings with an equivalent PEEC model
作者：Liu, Hongshun; Xia, Tian; He, Dongxin; Han, Mingming; Li, Qingquan; Duan, Yubing
作者机构：[Liu, Hongshun; Xia, Tian; He, Dongxin; Li, Qingquan] Shandong Univ, Sch Elect Engn, Jinan 250061, Shandong, Peoples R China.; [Han, Mingming; Duan, 更多
通讯作者：He, Dongxin;He, DX
通讯作者地址：[He, DX]Shandong Univ, Sch Elect Engn, Jinan 250061, Shandong, Peoples R China.
来源：INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
关键词：Partial element equivalent circuit; Very fast transient overvoltage;; Stepped controlled shunt reactor winding; Internal overvoltage
摘要：Stepped Controlled Shunt Reactors (SCSRs) have advantages of flexible control and reliable compensation and are likely to become widely used in Ultra-High-Voltage/Extra-High-Voltage (UHV/EHV) transmission systems. Very fast transients that occur in such systems will generate a Very Fast Transient Overvoltage (VFTO) in the SCSR. This may cause damage to the SCSR and lead to system losses. In this paper, the electric field strength and magnetic induction intensity are taken as the basic physical variables when these transients occur. Maxwell's equations are used to separate the constraint sources, such as the conduction current, magnetization current, and polarization current, from the field source. Then, an all-current Partial Element Equivalent Circuit (PEEC) model for these component elements that considers the surface charge is established. Fast and accurate calculations of the inductance parameters, which involve multiple integrals, are performed using geometrical mean distances and a complex component segmentation method. The equivalent structures and circuit equations of the SCSR windings are presented, and the voltage distribution of the SCSR windings under VFTOs of different frequencies is obtained. The results show that, the voltage waveform in the SCSR windings more rapidly attenuates as the VFTO frequency increases. The peak value of the oscillating voltage in the high-voltage winding of the SCSR is higher than that in the low-voltage winding.