System Integrity Protection Schemes in the Nordics -- a comparative analysis

TL;DR

This paper compares how different Nordic countries implement System Integrity Protection Schemes (SIPS) to enhance power system security, highlighting variations in approaches, definitions, and capacity valuation among stakeholders.

Contribution

It provides a comprehensive comparative analysis of SIPS practices in the Nordics based on surveys, interviews, and literature review, revealing discrepancies and commonalities.

Findings

Different approaches to SIPS use across Nordic countries

Variations in SIPS definitions and capacity valuation

Insights into stakeholder perspectives and practices

Abstract

To increase the utilisation rate of the power system and accelerate electrification while providing a high degree of security and reliability, System Integrity Protection Schemes (SIPS) are of great importance. SIPS functions are automatic remedial actions, detecting abnormal conditions or contingencies in the system and taking control action to mitigate these conditions. Design, implementation, maintenance and coordination of SIPS are all important aspects for desired operation. However, different actors have chosen different approaches to using SIPS for capacity enhancement, and there are discrepancies in how capacity is valued in relation to for example complexity, reliability and risk. Additionally, definitions often vary between countries. This paper reports on a joint survey and interview study on SIPS with stakeholders and experts in the Nordic countries - including TSOs, DSOs and industry. Combined with a literature review, a comparison and analysis of how SIPS are used in the Nordics is performed, particularly in relation to ENTSO-E capacity allocation.