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Voltage instability is a significant concern in power systems, particularly when the system is heavily loaded, experiences faults, or faces a shortage of reactive power. Ensuring the stability and security of a power system is a complex challenge that involves meeting various operational criteria and preparing for credible contingencies. Voltage instability is recognized as a significant contributor to power system insecurity and can lead to voltage collapse. Control devices, such as on-load Tap Changers (OLTC) play a crucial role in maintaining voltage stability. The OLTCs are designed to adjust the voltage on the load side to match their reference voltages. However, when the load demand becomes excessively high, it can lead to secondary voltage instability. This phenomenon, known as the reverse action of on-load tap changers, which leads to voltage instability has been demonstrated in this study using the MATLAB App Designer. The impact of the excitation system on the voltage control has been explored in this study through MATLAB/SIMPOWER simulations.

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Managing Voltage Instability: Insights Into On-Load Tap Changer (OLTC) and Excitation System

  • 会议论文

  • 发表日期：

    2025年

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  • Bazila Rashid,
  • Abdul Waheed Kumar,
  • Mairaj Ud Din Mufti

摘要

Voltage instability is a significant concern in power systems, particularly when the system is heavily loaded, experiences faults, or faces a shortage of reactive power. Ensuring the stability and security of a power system is a complex challenge that involves meeting various operational criteria and preparing for credible contingencies. Voltage instability is recognized as a significant contributor to power system insecurity and can lead to voltage collapse. Control devices, such as on-load Tap Changers (OLTC) play a crucial role in maintaining voltage stability. The OLTCs are designed to adjust the voltage on the load side to match their reference voltages. However, when the load demand becomes excessively high, it can lead to secondary voltage instability. This phenomenon, known as the reverse action of on-load tap changers, which leads to voltage instability has been demonstrated in this study using the MATLAB App Designer. The impact of the excitation system on the voltage control has been explored in this study through MATLAB/SIMPOWER simulations.