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European Market Coupling and Transmission Grid Simulation Framework

MILES - Model of International Energy Systems

The market and grid simulation frame­work MILES enables techno-economic analyses of the European energy system. MILES cov­ers the entire process of strategic transmission grid development. Thus, MILES forms the basis at the ie³ for studies on the holistic development and evaluation of sustainable energy system designs and transmission grid structures.

The simulation frame­work is designed as a modular tool chain. MILES comprises as superordinate process steps

  • the regionalization as well as the gen­era­tion of time series of decentralized renewable energy sources and loads,
  • the determination of the optimal power plant and exchange schedules,
  • the simulation of realistic operating conditions of the transmission grid as well as
  • the determination of necessary congestion management measures.

 

Regionalization
Market Coupling
Transmission Grid Operation
Congestion Management

Module 0

Scenario Generation & Reduction

Energy system scenarios form the basis of network development planning. Scenarios typically include forecasts of fu­ture electricity consumption and gen­era­tion especially with respect to the share of renewable energy sources. Future electricity demand is subject to structural changes, especially against the background of increasing intersectoral interactions due to advancing sector coupling. Due to the increasing electrification of the transport and heating sector and the rising demand for green gases and synthetic fuels, the sole consideration of the electricity sector in scenario gen­era­tion is no longer sufficient. To generate and analyse divergent transformation paths of the energy supply system, methods and procedures are developed at ie3 and continuously refined within the frame­work of current re­search work and applied in practice-oriented industrial studies.

Furthermore, the share of non-dispatchable RES in the system rises,  as a consequence power system operation, control and planning has to cope with increasing amounts of uncertainties. Uncertainties in the field of power systems are unplanned outages of thermal units, intermitting gen­era­tion of renewable energy sources, temperature sensitive electrical load and hydro gen­era­tion. Hence, the ie³ developed a scenario gen­era­tion approach to calculate various realizations of hourly power gen­era­tion and load profiles for the uncertain parameters (wind, solar, hydro and demand) in terms of operational scenarios based on historical climatic conditions of 40 years. The developed scenario gen­era­tion method applies a Monte Carlo (MC) approach combining realizations of hourly power gen­era­tion and load profiles based on the climatic conditions of one randomly selected historical weather year with randomized power plant availabilities (outage patterns) to generate samples of the stochastic inputs to model their uncertainty. Subsequently, it can generate a broad variety of so-called MC years to be used as an input for the following MILES modules. Additionally scenario reduction techniques have been developed to identify relevant sub-sets from the total amount of scenarios generated.

Module 1

Regionalization

The regionalization module of MILES calculates installed capacities at zonal level, starting from national level installed capacities. To distribute installed capacities of renewable energy sources, a top down approach is applied. National territory of each country is divided in sub-regions. Subsequently various statistical figures for each region are analysed to generate regionalization factors. The considered statistical parameters include socio-structural data, land use, location of existing plants and weather related data.

Module 2

Time Series Generation

Based on these regional assigned capacities the time-series-gen­era­tion calculates feed-in time series for each region based on historical weather data and characteristical power curves. The weather data are taken from the regional model COSMO-EU of Ger­ma­ny's National Meteorological Service. For the electrical load a historical load profile is broken down by means of regionalization factors and scaled to the targeted annual consumption, to generate spatially disaggregated time-series in each sub-region.

Module 3

Market Coupling

To determine the cost optimal dispatch of conventional power plants and storages to cover the electrical demand and control reserve needs, a mixed-integer linear program (Unit Commitment) is solved. The optimization considers feed-in of renewable energy sources, market coupling mecha­nisms as well as technical constraints of generating units. Technical constraints comprise minimum stable gen­era­tion and maximum rated power, maintenance scheduling, minimum up and downtimes, ramping constraints and maximal storage capacities. The market coupling simulation can consider different capacity models at individual borders. In addition to bilateral, coordinated net transfer capacities (NTC-values), flow-based capacities (in terms of PTDF-Matrices and RAM forming flow-based domains) can be considered. Thus, hybrid market coupling simulations as well as fully flow-based simulations can be carried out with MILES.

The optimization problem is solved by means of a rolling horizon approach. The considered year is split up in overlapping intervals of constant length. Each interval represent the planning horizon of market agents and is optimized sequentially. For this, preceding state-space system parameters at a fixed time step function as the initial phase of the subsequent interval.

Based on the results of the unit commitment problem, fundamental market clearing prices and amount of CO2-emissions of the individual bidding zones as well as total cost of energy supply are determined.

Module 4

Transmission Grid Operation

Based on the results of the presented market simulation, further network simulations are then carried out to derive the resulting network expansion requirement. The procedure for determining the need for network expansion involves network simulations in the form of (AC) power flow calculations, which are used to identify weak points in the network with regard to the supply and transport tasks set by the network participants. Simulations are carried out both in the basic network state ((n-0) case) and in the (n-1) case, i.e. assuming the failure of any network equipment.

Module 5

Congestion Management

For the bottlenecks in the network identified on the basis of the operating states, there is then the option of determining the network and system security measures necessary to ensure (n-1) security. These include changes to the operating points of HVDC transmission links and phase-shifting transformers, adjustments to the schedules of conventional power plants and storage facilities (redispatch), the reduction of feed-in power from renewables and CHP plants (feed-in management) and the switching of loads on and off (load management).

Module 6

Automated Expansion Planning

This module determines a time-resolved, optimal implementation plan for the optimal subset of specified transmission network expansion measures, taking into account technical and logistical implementation restrictions. The objective is to minimize the power-related bottlenecks in the transmission network area during the implementation period.

First of all, the input data, i.e. the list of possible actions, the network model and the corresponding network use cases are loaded within the frame­work of data preparation and processed and checked accordingly. Then, within the scope of the optional data reduction, a first selection of relevant network use cases can be made in undisturbed operation. Afterwards, the operating points of high-voltage direct current transmission lines (HVDC) and phase shifting transformers (PST), which cannot be con­trolled within the scope of the final optimization, are determined with the help of a pre-optimization. Taking into account the remaining use cases, the relevant n-1 cases are identified in the main run and when applying data reduction. A reduction of the transmission network model to a smaller (sub)network area relevant for the final optimization as well as a pre-analysis of the overload potentials in form of the maximum possible current-related network overloads is possible within the scope of the data reduction.

Before the final optimization, which determines the optimized expansion and implementation plan as well as the operating points of the controllable internal HVDC transmission and PST, a final use case selection is made for problem reduction. This happens especially when no data reduction is used. In addition, the determined optimal expansion plan can also be used as a starting solution for an iterative re-call of the planning environment, if required, in order to analyze further interdependencies of the transmission network expansion measures. Finally, a graphical representation of the results of the planning environment with regard to the implementation plan and the resulting network loads is provided.


Fields of Research

Exemplary Applications


Scientific Validation

Publications

Dennis Klein: Optimierungsgestützte Modellumgebung zur Bestimmung des Ausbaubedarfs elektrischer Übertragungsnetze, Dissertation, September 2020

Volker Liebenau: Einfluss der Regionalisierung Erneuerbarer Energien sowie innovativer Konzepte auf die Netzentwicklungsplanung, Dissertation, May 2019

Christopher Spieker: Europäische Strommarkt- und Übertragungsnetzsimulation zur techno-ökonomischen Bewertung der Netzentwicklung, Dissertation, May 2019

 


Contact

Energy System Design & Transmission Grids

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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