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February 24, 2014

Stability Study for NPTG (Mongolia) completed

DIgSILENT presents the results of the Stability Study of the Mongolian Power System in Ulan Bator (Mongolia) 

In preparation for the upcoming expansions of the Mongolian power system, NPTG engaged DIgSILENT GmbH to carry out a stability study of the transmission system. The results of the study were presented at the “Chinggis Khaan” Hotel in Ulan Bator (Mongolia) on the 11th February 2014, with the attendance of representatives of the Ministery of Energy and Transmission, Distribution and Power Generation companies, among others. 

Today, the Mongolian power system is characterized by a strong dependence on the interconnection to the neighboring countries’ power grid to maintain a reliable operation. In addition, most of the existing electrical infrastructure and generating power plants date back to the 1970s and 1980s. Since major efforts are being made to upgrade electrical components, commission new power plants and interconnect different areas inside the Mongolian power system, it is crucial to a perform a comprehensive stability screening in order to determine present and future stability patterns and to define needs for improvements.

The services delivered by DIgSILENT GmbH for this study included:

  • Determination of control characteristics of power plants, including a 2-week on-site visit of six power plants in the cities of Ulan Bator, Darkhan and Erdenet.
  • Modeling of the transmission system and generating plants for present and future (2020) scenarios.
  • Analysis of the isolated grid stability (no interconnection to neighboring systems), including the technical requirements at the power plant level (primary response) and the power reserves management.
  • Development of a load – shedding concept, in order to overcome major faults while maintaining system stability.
  • Determination of the oscillatory stability, including the identification of the critical oscillatory modes and the corresponding damping in the interconnected and isolated systems.
  • Implementation of a critical fault clearing time screening study (transient stability screening) covering all relevant operation scenarios.
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