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首页> 外文期刊>Electric Power Components and Systems >Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems
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Investigation of Main and Secondary Transformers on Mitigation of Voltage Sags, Swells and Interruptions in Unbalanced Medium Voltage Distribution Systems

机译：对电压凹陷缓解，膨胀和不平衡中压配电系统中的中断的研究

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摘要

Since voltage interruptions, sags and swells are Power Quality (PQ) disturbances with great economic impact, studies that seek alternatives to mitigate its effects have been conducted extensively. The PQ Brazilian standard names these disturbances as Short-Duration Voltage Variations (SDWs), classified them in terms of magnitude, duration, and frequency of occurrence. These parameters are used to calculate the Impact Factor (IF) of SDWs, a severity-characterization index of their incidence. In this context, this work assesses the influence of three-phase transformer winding connection and neutral grounding on the quantities of SDWs and the IF observed by an industrial consumer in a distribution system. Fault simulations at ATP-EMTP perform the study, considering two different winding connections for the secondary transformer and applying a grounding resistance to the neutral of the main transformer of the distribution system. The SDWs are verified in two different ways: phase-to-ground and phase-to-phase voltages. It is observed that there are differences in these quantities and for the value of the IF due to the winding connection of the secondary transformer, the value of the neutral grounding resistance of the main transformer and the ways of voltage verification.
机译：由于电压中断，凹陷和膨胀是具有巨大经济影响的电力质量（PQ）扰动，因此正在广泛地寻求减轻其效果的替代品的研究。 PQ巴西标准名称这些干扰作为短持续时间电压变化（SDW），在幅度，持续时间和发生频率方面进行分类。这些参数用于计算SDW的影响因子（IF），其发病率的严重性表征指数。在这种情况下，这项工作评估了三相变压器绕组连接和中性接地对分配系统中工业消费者的数量对SDW的影响。 ATP-EMTP的故障模拟执行该研究，考虑到次级变压器的两个不同的绕组连接，并对分配系统的主变压器的中性施加接地电阻。以两种不同的方式验证SDW：耦合和相位电压。观察到这些数量存在差异，并且对于次级变压器的绕组连接而具有诸如绕组连接的值，主变压器的中性接地电阻的值和电压验证方式。

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