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<p>Total Transfer Capability (TTC) represents the quantum of power that can be transferred from the Inter-State Transmission System (ISTS) to the State Transmission Network (STN), while meeting all security standards, including N-1 contingency conditions. Available Transfer Capability (ATC) is the portion of TTC that remains available from the ISTS network for&#xa0;STN&#xa0;after accounting for reliability margins. These computations reflect how resilient the STN to the loss of a single critical element, highlighting potential bottlenecks. One of the critical parameters to ensure the safe and secure operation of the State Grid is the loading of key interface points, such as Interconnecting Transformers (ICTs) and essential transmission corridors, between the State and ISTs network during N-1 contingency conditions. Monitoring and controlling the loading of these elements is vital to prevent thermal overloads and cascading failures. Enhancing the ATC/TTC of the transmission network becomes increasingly challenging when the loading on ICTs at a major substation approaches or exceeds operational limits under N-1 contingency conditions. Ensuring N-1 contingency compliance not only in the ISTS but also in the STN is essential for maintaining the reliability, safety, and security of the National Grid. This study analyzes the enhancement of the ATC of Madhya Pradesh State Transmission Network (MPSTN) for December 2023, aiming to accommodate the forecasted power demand without any system strengthening. Additionally, the study suggests proposed transmission network modifications for subsequent years. The study simulated the MPSTN with 614 buses and 1136 branches in PSS/E software. The Fixed Slope Newton Raphson (FDNR) and Power Transfer Distribution Factor (PTDF) algorithms enhanced the ATC limit of MPSTN from 11,700&#xa0;MW to 12,200&#xa0;MW for December 2023. Further, it proposes the network modifications to address non-credible contingencies observed during the analysis, ensuring system reliability in the coming years. The study examines the potential threats to the National Grid's security arising from the failure of any transmission element in the MPSTN downstream of a critically loaded ICT at the Julwaniya substation during an N-1 contingency.</p>

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A Real Time Approach to Determine ATC and TTC for a Secure Interconnected Power Transmission System

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Nidhi Misra,
  • K. T. Chaturvedi,
  • A. K. Sharma

摘要

Total Transfer Capability (TTC) represents the quantum of power that can be transferred from the Inter-State Transmission System (ISTS) to the State Transmission Network (STN), while meeting all security standards, including N-1 contingency conditions. Available Transfer Capability (ATC) is the portion of TTC that remains available from the ISTS network for STN after accounting for reliability margins. These computations reflect how resilient the STN to the loss of a single critical element, highlighting potential bottlenecks. One of the critical parameters to ensure the safe and secure operation of the State Grid is the loading of key interface points, such as Interconnecting Transformers (ICTs) and essential transmission corridors, between the State and ISTs network during N-1 contingency conditions. Monitoring and controlling the loading of these elements is vital to prevent thermal overloads and cascading failures. Enhancing the ATC/TTC of the transmission network becomes increasingly challenging when the loading on ICTs at a major substation approaches or exceeds operational limits under N-1 contingency conditions. Ensuring N-1 contingency compliance not only in the ISTS but also in the STN is essential for maintaining the reliability, safety, and security of the National Grid. This study analyzes the enhancement of the ATC of Madhya Pradesh State Transmission Network (MPSTN) for December 2023, aiming to accommodate the forecasted power demand without any system strengthening. Additionally, the study suggests proposed transmission network modifications for subsequent years. The study simulated the MPSTN with 614 buses and 1136 branches in PSS/E software. The Fixed Slope Newton Raphson (FDNR) and Power Transfer Distribution Factor (PTDF) algorithms enhanced the ATC limit of MPSTN from 11,700 MW to 12,200 MW for December 2023. Further, it proposes the network modifications to address non-credible contingencies observed during the analysis, ensuring system reliability in the coming years. The study examines the potential threats to the National Grid's security arising from the failure of any transmission element in the MPSTN downstream of a critically loaded ICT at the Julwaniya substation during an N-1 contingency.