Novel Differential Protection for a Powerformer Considering Capacitive Current Compensation

被引：1

作者：

Wang, Yuanyuan ^{[1
]}

Luo, Xiaomin ^{[1
]}

Zeng, Xiangjun ^{[1
]}

Zhou, Lawu ^{[1
]}

Ye, Yuxuan ^{[1
]}

机构：

[1] Changsha Univ Sci & Technol, Sch Elect & Informat Engn, Changsha 410114, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2023年 / 38卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Powerformer; stator faults; differential protection; capacitive current compensation; SYNCHRONOUS GENERATOR; VOLTAGE; FAULT;

D O I：

10.1109/TPWRD.2023.3268302

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A Powerformer is a special type of generator whose peak capacitive current is approximately 30 times larger than that of conventional generators with the same rated apparent power. Powerformer stator fault relays may be misoperated by using conventional differential protection strategies, thus degrading network reliability. Therefore, a novel differential protection scheme for a Powerformer is proposed in this paper. First, the nonlinear distribution laws of the Powerformer stator winding capacitance and induced electromotive force (EMF) are analyzed. Next, an equivalent distributed parameter circuit model of the Powerformer considering cable-windings with graded insulation is established and verified by using FEM-based analysis. Furthermore, to eliminate the influence of the capacitive current on the differential protection, the capacitive current is analyzed, and a novel differential protection scheme considering capacitive current compensation is proposed. A simulation model is established by using MATLAB and PSCAD, and extensive simulation studies verify the effectiveness of the proposed protection approach.

引用

页码：3169 / 3178

页数：10

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