Oil and Gas Field in Eastern Siberia

Challenge

Ensure reliable and uninterrupted operation of process units under all types of disturbances in both external and internal electrical networks.

The project was executed under a major change in the power supply configuration:

• decommissioning of on-site generation
• transition to power supply from the external grid (110 kV transmission network)

An additional challenge was the presence of a large number of electric motors with different starting characteristics, highly sensitive to power quality and system stability.

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Risks

Under the existing configuration, the following risks were identified:

• process shutdowns under fault conditions
• loss of motor stability
• incorrect operation of protection systems and emergency controls
• cascading failure scenarios

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Approach

A digital model of the facility power system was developed to enable comprehensive analysis and reliability improvement.

The following activities were performed:

• collection and validation of input data, including site surveys
• development of a detailed power system model
• load flow analysis
• short circuit analysis with equipment duty verification
• protection coordination and automatic transfer scheme analysis
• transient stability analysis
• motor reacceleration studies

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System Analysis

The most critical operating scenarios were analyzed, including:

• disturbances in the external grid
• internal faults and equipment outages
• severe motor starting and reacceleration conditions

Special focus was placed on scenarios leading to instability and process interruptions.

The calculated parameters were verified against applicable standards, including:

• Russian Ministry of Energy Order No. 630 (2018) – power system stability guidelines
• Russian Ministry of Energy Order No. 380 (2015) – active/reactive power ratio requirements
• GOST 32144-2013 – power quality standards

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Results

As a result of the project:

• a validated digital model of the power system was developed
• critical operating conditions and system vulnerabilities were identified
• root causes of potential failures and instability were determined
• a comprehensive set of reliability improvement measures was developed
• stable operation of equipment under fault conditions was ensured
• risks of process shutdowns were significantly reduced

All proposed solutions were validated through calculations and comply with applicable regulatory requirements.

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