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Method to Eliminate Flux Linkage DC Component in Load Transformer for Static Transfer Switch

机译：消除静电转换开关负荷变压器中磁链直流分量的方法

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摘要

Many industrial and commercial sensitive loads are subject to the voltage sags and interruptions. The static transfer switch (STS) based on the thyristors is applied to improve the power quality and reliability. However, the transfer will result in severe inrush current in the load transformer, because of the DC component in the magnetic flux generated in the transfer process. The inrush current which is always 2~30 p.u. can cause the disoperation of relay protective devices and bring potential damage to the transformer. The way to eliminate the DC component is to transfer the related phases when the residual flux linkage of the load transformer and the prospective flux linkage of the alternate source are equal. This paper analyzes how the flux linkage of each winding in the load transformer changes in the transfer process. Based on the residual flux linkage when the preferred source is completely disconnected, the method to calculate the proper time point to close each phase of the alternate source is developed. Simulation and laboratory experiments results are presented to show the effectiveness of the transfer method.
机译：许多工业和商业敏感负载易受电压骤降和中断的影响。基于晶闸管的静态转换开关（STS）用于改善电能质量和可靠性。但是，由于在传输过程中产生的磁通量中存在直流分量，因此传输会在负载变压器中导致严重的浪涌电流。浪涌电流始终为2〜30p.u。可能会导致继电保护装置的失灵并可能对变压器造成损坏。消除直流分量的方法是在负载变压器的剩余磁链与备用电源的预期磁链相等时转移相关相。本文分析了负载变压器中每个绕组的磁链在传输过程中如何变化。基于当首选电源完全断开时的剩余磁链，开发了一种计算适当时间点以关闭备用电源各相的方法。仿真和实验室实验结果表明了该转移方法的有效性。

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