Project Summary

1. Background and Research Question

The development of the transmission system is - without doubt - one of the most challenging tasks towards reaching a sustainable power supply, as it is envisaged by the German federal government within the framework of the “Energiewende”. A sustainable power supply does not only refer to an environmentally-friendly energy production but also includes both economic efficiency and ongoing security of energy supply - just as it is mentioned in the classic energy policy goal triangle.

In the past, the planning of transmission systems has mainly been driven by the technical objective of “security of supply” by trying to ensure the (n-1)-criterion as cost-effective as possible.

Due to the liberalization of the energy market and the increasing European integration, the traditional approach of planning is stretched to its limits, since a simultaneous planning of power generation and transmission is no longer feasible. Hence, aside from the transmission grid, the electricity markets also play a vital role in ensuring an efficient energy supply system.

In order to achieve the best results in planning of transmission systems, a planning instrument is required which accommodates the interdependence of grid operation and the electricity markets in an enhanced manner. Such instrument also needs to take into consideration the integration of new technologies such as FACTS (flexible alternating current transmission systems) and HVDC (high voltage direct current) transmission.


2. Objective

As outlined above by the research question and problem definition, the goal of the present project is the development of innovative methods for planning transmission systems in order to ensure a technically-secure and economically-efficient grid development.

In order to achieve this objective a better illustration of the future system operation paired with the relevant market activities shall be developed. Essential interdependencies as well as some of the aforementioned aspects are summarized by the following figure.

Figure 1: Schematic of interdependences of the grid development planning

To simulate the market, the WILMAR/JMM market model shall be used. Within the research project, the interactions between the mentioned WILMAR/JMM model and the grid model are to be investigated. For the above task, interfaces between both simulation models shall be implemented.  E.g., the grid model shall enabled to consider the forthcoming power plant scheduling based on the underlying market conditions.

Through the combined simulation of market and grid as well as the improved representation of modern grid control devices, it is the aim of this research project to develop methods for the optimal planning of transmission systems in due consideration of technical and economic criteria.


3. Project design

The project is divided into six work packages:


A) Best possible illustration of interdependences between grid development, markets and grid operation


B) Best possible illustration of modern grid equipment in the combined simulation of the market and transmission system


C) Best possible illustration of  impacts of fluctuating wind and solar power input into markets and transmission system management


D) Best possible illustration of  the German and European international integration of markets and grid operation


E) Conception of the interface between market and grid simulation and the development of a standardized application concept


F) Execution of exemplary application runs



Project duration:

January 2015 – December 2017


Contact partner:

Björn Felten, Lenja Niesen, Caroline Deilen, Tim Felling


Subsidized by:


In cooperation with: