Soft Transformer Energization: Ramping Time Estimation Method for Inrush Current Mitigation

Abdulrahman Alassi, K. Ahmed, A. Egea-Àlvarez, C. Foote
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引用次数: 1

Abstract

Uncontrolled transformer energization is known to cause high magnitude inrush currents that can reach up to 10 times transformer rating. Several techniques are proposed in literature to mitigate this issue, including soft transformer energization using a voltage ramp. This technique is regaining more traction with the increased use of converters-based generation. Defining the required voltage ramping time for effective inrush current mitigation is important to avoid fast ramps that can still cause large inrush currents. This paper proposes a model-based ramping time estimation technique that can be used to identify the minimum-adequate voltage ramp time for a given set of constraints, transformer model and network configuration. Key ramping time influencing factors are defined as: residual flux, source to energized core effective impedance and control, in addition to core saturation characteristics. The proposed method considers multiple simulation steps to identify the minimum required ramping time. Simulation case study is presented for a voltage source energization of a 53 MVA three-phase delta-wye transformer, demonstrating the technique capability of determining appropriate ramping times for effective inrush current mitigation. Sensitivity analysis are also carried out to illustrate the impact of varying key parameters such as the transformer core saturation characteristics on the results.
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软变压器通电:缓解涌流的斜坡时间估计方法
众所周知,不受控制的变压器通电会导致高强度的涌流,可以达到变压器额定值的10倍。文献中提出了几种技术来缓解这个问题,包括使用电压斜坡的软变压器通电。随着基于转换器的发电的使用增加,这种技术正在重新获得更多的牵引力。确定有效缓解浪涌电流所需的电压斜坡时间对于避免快速斜坡仍然可能导致大的浪涌电流非常重要。本文提出了一种基于模型的斜坡时间估计技术,该技术可用于识别给定约束集、变压器模型和网络配置下的最小足够电压斜坡时间。关键的爬坡时间影响因素定义为:剩余磁通、电源对通电铁心的有效阻抗和控制,以及铁心饱和特性。该方法考虑多个仿真步骤来确定所需的最小斜坡时间。给出了一个53 MVA三相三角型变压器电压源通电的仿真案例研究,展示了确定适当的斜坡时间以有效缓解涌流的技术能力。灵敏度分析还说明了不同的关键参数,如变压器铁心饱和特性对结果的影响。
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