IEEE Power & Energy Magazine - March/April 2021 - 57

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of system elements and is closely related to system adequacy,
reliability, and integrity. This article is concerned with security issues in the operation of the high-voltage transmission
grid originating from environmental or transmission constraints and focuses on the case of Switzerland. Specifically, we focus on steady-state insecurity, namely violations
in transmission line flows or bus voltage limits following
a component contingency, without considering dynamic
aspects such as maintaining synchronism and system stability following the disturbance.
First, we describe today's operational philosophy
of Swissgrid, the Swiss transmission system operator
(TSO), which is also commonly applied by other European TSOs. Next, we identify potential risks of this
operational philosophy, which we exemplify through discussion of recent grid events in the Swiss power system
and link to observed trends in system operation. Finally,
we argue that a new operational paradigm is needed to
mitigate such risks in the transmission grid of the future.
This new philosophy relies on data analytics and decision support systems (DSSs) to assist the work of system
march/april 2021

operators, and we provide examples of recent relevant
initiatives at Swissgrid.

Security Challenges and Today's
Transmission System Operator
Operational Philosophy
Power system security is one of the key responsibilities of
TSOs. This article elaborates on how system security is
addressed in the planning and operational procedures in
Switzerland. Despite the Swiss focus, the principles of the
operational philosophy outlined here apply to several other
European TSOs as well.

The Unique Characteristics
of the Swiss Power System
The Swiss transmission system is very strongly interconnected with its neighboring countries. There are, in fact, 41
cross-border transmission lines compared to about 160 lines
that both start and end within Switzerland.
The Swiss transmission system evolved organically by
following the residential and commercial activity patterns
ieee power & energy magazine

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IEEE Power & Energy Magazine - March/April 2021

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2021

Contents
IEEE Power & Energy Magazine - March/April 2021 - Cover1
IEEE Power & Energy Magazine - March/April 2021 - Cover2
IEEE Power & Energy Magazine - March/April 2021 - Contents
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IEEE Power & Energy Magazine - March/April 2021 - Cover3
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