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首页> 外文会议>10th International Conference on Advances in Power System Control, Operation amp; Management >A comparative study of different transformer connections for railway power supply-mitigation of voltage unbalance
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A comparative study of different transformer connections for railway power supply-mitigation of voltage unbalance

机译：铁路供电中不同变压器接线方式的比较研究－缓解电压不平衡

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摘要

The railway represents a large power consumer that can cause uneven loading of the phases in the high voltage grid. These unbalanced loads supplied by the utility may lead to voltage unbalance problems in the system and thereby affects the other consumers connected to the same network. It is fact that, voltage unbalance appears mainly as a result of unbalanced currents at the points of common coupling drawn by unevenly distributed loads. Because of a significant amount of negative sequence current injected to the system, the power system components will suffer from consequent negative effects such as overheating, additional losses of lines and transformers, interference with communication systems etc. This paper presents a comparative study of some transformer connections which commonly used in railway supplying AC traction loads, for voltage unbalance mitigations. Simulations for comparison of transformers are carried out and the results are also compared with the values obtained by the voltage unbalance estimation formulas.
机译：铁路代表着巨大的电力消耗，可能导致高压电网中各相的负载不均匀。电力公司提供的这些不平衡负载可能导致系统中的电压不平衡问题，从而影响连接到同一网络的其他用户。实际上，电压不平衡的出现主要是由于负载分布不均引起的公共耦合点电流不平衡所致。由于向系统中注入了大量的负序电流，电力系统组件将遭受随之而来的负面影响，例如过热，线路和变压器的额外损耗，对通信系统的干扰等。本文对一些变压器进行了比较研究。铁路中常用的交流牵引负载的连接，用于缓解电压不平衡。进行了用于比较变压器的仿真，并且还将结果与通过电压不平衡估计公式获得的值进行了比较。

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