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Distribution Grid Planning and Operation

Automated expansion planning


© ie3​/​TU Dort­mund

The political will to protect the climate and the corresponding targets of the EEG are leading to an increase in installed capacity for electricity gen­era­tion from renewable energy resources in Germany. In addition, many applications in the mobility and heat sector will be electrified. The distribution grids in particular account for a large part of this development and, due to the new supply task, there is a significant need for grid reinforcement in many regions. Since grid expansion is associated with high investment costs, methods must be developed to determine the necessary and cost-efficient grid expansion measures. At ie³, various simulation environments can be used to simulate the need for grid expansion taking into account current planning principles.

The simulation environment ADiXPlan enables the determination of grid reinforcement measures on the basis of two generated relevant grid study cases. The methodology uses forecasts for the increase of installed capacities of distributed energy resource units in addition to the grid data as an input. A discretisation in individual units is then carried out to determine the fu­ture supply task in the grid area. In the next step, the behaviour of flexible units can be taken into account in the creation of the load and feed-in scenarios. For example, peak shaving of wind turbines can be considered using an upstream time series simulation. Power flow calculations can be carried out for both study cases, in which the use of in­no­va­ti­ve equipment, such as OLTCs, is optimized. In case of constraint violations, efficient grid expansion measures are determined by means of a heuristic. The heuristic enables the rapid calculation of different fu­ture scenarios in the investigated grids and provides the grid expansion measures as a result, which is also expressed in monetary terms. Additional in­for­mation about ADiXPlan can be found in the dissertation "In­te­gra­ti­on und Bewertung der Spitzenkappung als Planungsgrundsatz zur wirtschaftlichen Netzentwicklung in Mittelspannungsnetzen" by Dr.-Ing. Christian Wagner.

An extension of the expansion simulation tool allows the determination of grid expansion measures based on annual time series and integrates the general flexibility consideration into the planning process. Existing time series, which may originate from a market simulation or SIMONA, are expanded to include in­for­mation on whether the associated units are fundamentally flexible and can be used to counter congestions. An input parameter is used to determine the extent to which the flexibility of these units can be used for that purpose. On the basis of sensitivity calculations, the schedules of the flexible units are adjusted in such a way that any breaches of grid constraints are eliminated or reduced. Thus, the changed time series of each unit serve as input data for the selection of the grid reinforcement measures. These measures are determined for meshed grid topologies by means of optimisation. The expansion simulation thus generates grid expansion variants which require flexibility management that is beneficial to the grid. These grid expansion variants for example can be used for the economic analysis and evaluation of regional flexibility markets and the associated investment cost savings in grid expansion.

Location & approach

The campus of TU Dort­mund Uni­ver­sity is located close to interstate junction Dort­mund West, where the Sauerlandlinie A 45 (Frankfurt-Dort­mund) crosses the Ruhrschnellweg B 1 / A 40. The best interstate exit to take from A 45 is "Dort­mund-Eichlinghofen" (closer to Cam­pus Süd), and from B 1 / A 40 "Dort­mund-Dorstfeld" (closer to Cam­pus Nord). Signs for the uni­ver­si­ty are located at both exits. Also, there is a new exit before you pass over the B 1-bridge leading into Dort­mund.

To get from Cam­pus Nord to Cam­pus Süd by car, there is the connection via Vo­gel­pothsweg/Baroper Straße. We recommend you leave your car on one of the parking lots at Cam­pus Nord and use the H-Bahn (suspended monorail system), which conveniently connects the two campuses.

TU Dort­mund Uni­ver­sity has its own train station ("Dort­mund Uni­ver­si­tät"). From there, suburban trains (S-Bahn) leave for Dort­mund main station ("Dort­mund Hauptbahnhof") and Düsseldorf main station via the "Düsseldorf Airport Train Station" (take S-Bahn number 1, which leaves every 20 or 30 minutes). The uni­ver­si­ty is easily reached from Bochum, Essen, Mülheim an der Ruhr and Duis­burg.

You can also take the bus or subway train from Dort­mund city to the uni­ver­si­ty: From Dort­mund main station, you can take any train bound for the Station "Stadtgarten", usually lines U41, U45, U 47 and U49. At "Stadtgarten" you switch trains and get on line U42 towards "Hombruch". Look out for the Station "An der Palmweide". From the bus stop just across the road, busses bound for TU Dort­mund Uni­ver­sity leave every ten minutes (445, 447 and 462). Another option is to take the subway routes U41, U45, U47 and U49 from Dort­mund main station to the stop "Dort­mund Kampstraße". From there, take U43 or U44 to the stop "Dort­mund Wittener Straße". Switch to bus line 447 and get off at "Dort­mund Uni­ver­si­tät S".

The AirportExpress is a fast and convenient means of transport from Dort­mund Airport (DTM) to Dort­mund Central Station, taking you there in little more than 20 minutes. From Dort­mund Central Station, you can continue to the uni­ver­si­ty campus by interurban railway (S-Bahn). A larger range of in­ter­na­tio­nal flight connections is offered at Düsseldorf Airport (DUS), which is about 60 kilometres away and can be directly reached by S-Bahn from the uni­ver­si­ty station.

The H-Bahn is one of the hallmarks of TU Dort­mund Uni­ver­sity. There are two stations on Cam­pus Nord. One ("Dort­mund Uni­ver­si­tät S") is directly located at the suburban train stop, which connects the uni­ver­si­ty directly with the city of Dort­mund and the rest of the Ruhr Area. Also from this station, there are connections to the "Technologiepark" and (via Cam­pus Süd) Eichlinghofen. The other station is located at the dining hall at Cam­pus Nord and offers a direct connection to Cam­pus Süd every five minutes.

The facilities of TU Dort­mund Uni­ver­sity are spread over two campuses, the larger Cam­pus North and the smaller Cam­pus South. Additionally, some areas of the uni­ver­si­ty are located in the adjacent "Technologiepark".

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