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首页> 外文期刊>Generation, Transmission & Distribution, IET >Effect of interphase magnetic coupling of shunt reactor on transmission-line open-phase overvoltages and neutral reactor optimisation
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Effect of interphase magnetic coupling of shunt reactor on transmission-line open-phase overvoltages and neutral reactor optimisation

机译：并联电抗器的相间磁耦合对输电线路缺相过电压的影响及中性电抗器的优化

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摘要

This study thoroughly studies overvoltages appearing on the isolated phase (s) of shunt reactor compensated transmission-lines when remaining phases are left energised. The voltage that appears on the isolated phase would settle to a steady-state component induced from the energised phases. This endures until all other phases are disconnected or the isolated phase is re-energised. Reactors with different zero- and positive-sequence reactances are less common but not rare. Taking this point into account, a general model is introduced for three-phase reactors involving those with interphase magnetic coupling. Accordingly, a rigorous analytical formulation is developed to prevent open-phase damaging overvoltages. As proposed, this is achieved by installing a suitable neutral reactor whose optimal value is obtained using the extracted closed-form equations. It is shown that in the case of shunt reactors with interphase magnetic coupling, open-phase overvoltages are more likely to arise even for small degrees of compensation. Based on the defined objectives, a range is determined for the neutral reactance in which no open-phase overvoltage would appear. This provides a high flexibility in sizing the neutral reactor considering technical and economical limitations. The accuracy of the employed models and effectiveness of the optimised neutral reactance are further illustrated through extensive simulation studies using the electromagnetic transient program EMTP-RV.
机译：这项研究彻底研究了剩余相通电时在并联电抗器补偿传输线的隔离相上出现的过电压。出现在隔离相上的电压将稳定到由通电相感应出的稳态分量。一直持续到所有其他相都断开连接或隔离相重新通电为止。具有零序和正序电抗的电抗器较不常见，但并不罕见。考虑到这一点，引入了三相电抗器的通用模型，其中包括具有相间磁耦合的三相电抗器。因此，开发了严格的分析公式以防止断相破坏性过电压。如所提出的，这是通过安装合适的中性电抗器来实现的，该中性电抗器的最佳值是使用提取的闭合形式方程式获得的。结果表明，在具有相间磁耦合的并联电抗器的情况下，即使进行小程度的补偿，也更可能出现断相过电压。基于定义的目标，确定中性电抗的范围，在该范围内不会出现断相过电压。考虑到技术和经济上的限制，这在确定中性电抗器的尺寸方面提供了高度的灵活性。通过使用电磁瞬变程序EMTP-RV进行的广泛模拟研究，进一步说明了所采用模型的准确性和优化的中性电抗的有效性。

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