Smart Wires Inc.

TransnetBW, Smart Wires and network planning software providers pave the way for modelling of modular power flow control technology

June 1, 2023

TransnetBW, technology provider Smart Wires, and research institution FGH have jointly developed a Static Synchronous Series Compensator (SSSC) model for the INTEGRAL network planning software. The SSSC model is also available in DIgSILENT’s network planning software PowerFactory and in the European standard data format CIM (Common Information Model). As a result, transmission and distribution system operators across the world can now easily model SSSCs as part of their network planning.


Power flow control devices, such as modular SSSCs, are a possible alternative solution to make better use of available transmission capacity on existing lines rather than favoring grid expansion. In Germany this is known as the NOVA principle (grid optimization first, before reinforcement before expansion). However, often these technologies cannot be adequately considered in the initial phases of network planning simply because models are not readily available in every network planning software.

TransnetBW identified the potential of SSSCs for network planning at an early stage, however there was no SSSC model available in the INTEGRAL and PowerFactory planning software they use. Together with Smart Wires, TransnetBW developed a SSSC model that is now available to all users of INTEGRAL and PowerFactory.

This outcome is part of the digital transformation within TransnetBW and builds on previously published work which includes Untersuchung der Interoperabilität verschiedener Netzplanungswerkzeuge(Florez, et al., EnInnov2022), and Development of a generic SSSC model in PowerFactory. Convergence between IT and OT practices (Florez, et al., WIW2022).

The new SSSC model in INTEGRAL is one of several initiatives to make models for grid enhancing technologies more widely available to system operators. A recent project led by the industry association currENT, brought together several technology providers, research institutions, and consultants, to develop standardized models for technologies, including modular SSSCs using CIM practices (Common Information Model).

The joint efforts of TransnetBW, Smart Wires, FGH, DIgSILENT and currENT shows the progress that can be made when stakeholders from across industry work together with the same goal of creating a digital power grid capable of support climate neutrality.

Figure 9. CIM extensions for mapping SSSC controllers

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