Main Protection Optimization Scheme for Generator Parallel Operation of Rotating Asynchronous Machine in Nuclear Power Plants

IF 3.8 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Power Delivery Pub Date : 2025-04-02 DOI:10.1109/TPWRD.2025.3557170

Yikai Wang;Chaozheng Xu;Jian Qiao;Zhihui Dai;Liming Tan;Xianggen Yin

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Abstract

The Rotating Asynchronous Machine (RAM) system of a nuclear power plant provides a stable and reliable power supply for the control rod drive mechanism (CRDM) through two parallel generators. At present, the main protection of the generators in the RAM system is only configured with longitudinal differential protection, which cannot reflect the interturn short circuit fault and interbranch short circuit fault of the stator winding. Based on the characteristics of parallel connection of RAM generators in nuclear power plants, this article proposes a dual-generator split phase transverse differential protection and a dual-generator incomplete longitudinal differential protection. Through the internal fault set of the generator and the internal fault potential splitting model of the generator, the quantitative analysis of different main protection configuration schemes is carried out. It is concluded that the existing longitudinal differential protection and the incomplete longitudinal differential protection of two parallel generators can correctly reflect the vast majority of internal short-circuit faults. Finally, the dynamic experiment is carried out to prove the feasibility of the protection method in the actual unit operation.

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核电站旋转异步发电机并联运行主保护优化方案

核电站旋转异步电机（RAM）系统通过两台并联发电机为控制棒驱动机构（CRDM）提供稳定可靠的电源。目前RAM系统中发电机的主保护仅配置纵向差动保护，无法反映定子绕组匝间短路故障和支路间短路故障。根据核电站随机存取发电机并联的特点，提出了双机分相横向差动保护和双机不完全纵向差动保护。通过发电机内部故障集和发电机内部故障电位划分模型，对不同的主要保护配置方案进行了定量分析。得出结论：现有的纵向差动保护和两台并联发电机的不完全纵向差动保护能够正确反映绝大多数内部短路故障。最后进行了动态实验，验证了该保护方法在实际机组运行中的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Power Delivery 工程技术-工程：电子与电气

CiteScore

9.00

自引率

13.60%

发文量

513

审稿时长

6 months

期刊介绍： The scope of the Society embraces planning, research, development, design, application, construction, installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy. It includes the developing of engineering standards, the providing of information and instruction to the public and to legislators, as well as technical scientific, literary, educational and other activities that contribute to the electric power discipline or utilize the techniques or products within this discipline.