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Mitigation of the impact of transformer inrush current on voltage sag by TCSC

机译：TCSC减轻了变压器浪涌电流对电压骤降的影响

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摘要

Thyristor Controlled Series Capacitor (TCSC) as a dynamic system, besides its capability in increasing power transfer in transmission lines, can be used to enhance different power system issues. In this paper, the effect of TCSC on voltage sag following transformer inrush current is investigated. It is shown that excessive transient inrush current occurring during transformer energizing can be mitigated by TCSC Hence, voltage sag as one of the key components of the power quality is alleviated for the sensitive loads that are connected to the same bus which the power transformer is energized from. During a fault, TCSC can improve the voltage sag by limiting the current and help to keep the voltage as high as possible. Moreover, the inrush currents and the associated voltage sags that usually occur after clearing heavy single- or multistage faults are mitigated by the presence of TCSC. The model used for simulating inrush current is based on the characteristics of the major hysteresis loop out of which the internal trajectories are defined using the translation principal and a linear compensation to generate closed loops. An arctangent relation between the flux and the exciting current is defined. The expression parameters are deduced by curve fitting empirical data defining the major loop or the single-valued saturation characteristic.
机译：晶闸管控制串联电容器（TCSC）作为动态系统，除了具有增加传输线中功率传输的能力外，还可以用于增强不同的电源系统问题。本文研究了TCSC对变压器浪涌电流后电压骤降的影响。结果表明，通过TCSC可以减轻在变压器通电过程中产生的过大瞬态浪涌电流。因此，对于连接到与变压器通电的同一条母线上的敏感负载，电压骤降是电能质量的重要组成部分之一。从。在故障期间，TCSC可以通过限制电流来改善电压骤降，并有助于保持尽可能高的电压。此外，TCSC的存在可以缓解通常在清除严重的单级或多级故障之后通常会出现的浪涌电流和相关的电压骤降。用于模拟浪涌电流的模型基于主要磁滞回线的特性，通过使用平移原理和线性补偿来定义内部轨迹，以产生闭环，从而形成内部轨迹。定义了磁通和励磁电流之间的反正切关系。通过定义主回路或单值饱和特征的曲线拟合经验数据推导表达式参数。

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