张田,贾波,丁硕,周濛
ZHANG Tian,JIA Bo,DING Shuo,ZHOU Meng

• 1:中国电力工程顾问集团中南电力设计院有限公司
• 2:新能源电力系统国家重点实验室(华北电力大学)

摘要(Abstract)：

为避免移相变接入系统后发生区外故障时两侧线路远端距离保护误动，影响系统的可靠性，提出了一种基于故障测距波动系数的移相变接入后线路距离保护改进方案。该方案从线路时域上的故障测距方程出发，利用移相变接入后破坏了原有线路的均匀阻抗从而使得故障测距波动系数大幅增大的特性，实现区内外故障的判别。在已有保护的基础上，对距离保护Ⅰ、Ⅱ段判据进行改进，通过求解R-L线性微分方程组得到故障距离，再结合保护范围和测距波动系数判别是否为区内故障，保证移相变接入系统后线路距离保护正确动作。最后，基于PSCAD/EMTDC平台搭建典型移相变接入线路仿真模型，验证了所提方案的准确性和可行性。
To prevent the maloperation of distance protection at remote line ends during external faults following the integration of a phase-shifting transformer(PST) which degrades system reliability, this paper proposes an enhanced distance protection scheme based on a fault location fluctuation coefficient. Grounded in time-domain fault location equations, the proposed scheme exploits the physical characteristic that the PST integration disrupts the uniform line impedance profile, resulting in a pronounced increase in the fault location fluctuation coefficient under specific conditions. This distinct feature is utilized to effectively discriminate between internal and external faults. Building upon existing protection infrastructures, the operating criteria for distance protection zones I and II are refined. The precise fault distance is determined by solving a set of R-L linear differential equations, which is then evaluated in conjunction with the predefined protection zones and the fluctuation coefficient to verify internal faults, thereby ensuring the dependable operation of the distance protection after PST integration. Finally, a simulation model of a typical transmission line integrated with a PST is constructed in the PSCAD/EMTDC platform. The simulation results validate the accuracy and feasibility of the proposed protection scheme.

关键词(KeyWords)： 移相变;距离保护;波动系数;故障测距;输电线路
phase-shifting transformer;distance protection;fluctuation coefficient;fault location;transmission line

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金联合基金（U2166205）

作者(Author): 张田,贾波,丁硕,周濛
ZHANG Tian,JIA Bo,DING Shuo,ZHOU Meng

DOI: 10.19585/j.zjdl.202610003

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