Julian Rominger (M. Sc.)

Wissenschaftlicher Mitarbeiter

Werdegang

Julian Rominger studierte Wirtschaftsingenieurwesen am Karlsruher Institut für Technologie (KIT) und schloss sein Masterstudium im Jahr 2016 ab. Die Masterarbeit zum Thema „Regelleistungsbereitstellung durch RLT-Anlagen“ fand im Rahmen des Projektes „SmartEnergy@FIZ“ zwischen dem FZI Forschungszentrum Informatik und BMW statt. Des Weiteren absolvierte er im Jahr 2015 einen internationalen Master im Bereich Energie und Umwelt mit Abschlüssen der Universitäten Universidad Politécnica de Madrid (UPM) und dem Royal Institute of Technology (KTH) in Stockholm. Während seines Studiums sammelte er Praxiserfahrung durch Praktika unter anderem in der Energie- und Automobilbranche.

Seit 2016 ist Julian Rominger als wissenschaftlicher Mitarbeiter am FZI im Forschungsbereich Intelligent Systems and Production Engineering (ISPE) tätig, wo er sich mit Flexibilitätsvermarktung von Energieeinheiten beschäftigt.

Publikationen

Zeitungs- oder Zeitschriftenartikel (2)

1. Battery storage systems: An economic model-based analysis of parallel revenue streams and general implications for industryInfoDetails

   Fritz Bräuer, Julian Rominger, Russel McKenna, Wolf Fichtner, 2019

   This paper evaluates the economic potential of energy flexibility in 50 different German small and medium sized enterprises (SMEs) through the installation of a battery storage system (BSS). The central innovation lies in the possibility of pursuing multiple revenue streams simultaneously: peak shaving, provision of primary control reserve (PCR) and energy-arbitrage-trading through intraday and day-ahead markets. The energy system of an industrial manufacturing plant is modelled as a linear program (LP) with a 15-min resolution. The model offers the option to invest in BSSs with different capacities, with the objective of minimizing the overall cost and identifying the optimal size of the BSS. The results show that none of these three revenue streams individually is economically attractive, but when combined, all three together can achieve profitability for some companies, whereby the majority of the cash flow comes from peak shaving and PCR. With a fixed BSS capacity of 500 kWh, the Net Present Value (NPV) varies from a minimum of 350,000 € for just arbitrage up to about 200,000 € for all three use cases in parallel. In the case of a variable BSS capacity, the capacity varies up to 1200 kWh and the Profitability Index (the ratio of investment to NPV) varies from 0.06 to 0.31. Under current German market conditions, arbitrage trading contributes only marginally to the profitability, as the price spreads are too small to justify stronger battery degradation. The paper also identifies various load indicators from the analysis of the demand profile that support the evaluation of a BSS in industry. A stepwise linear regression reveals a moderate dependency of the BSS profitability on two newly developed load indicators. Future work should focus on a more detailed depiction of the battery’s technical behaviour and increasing the sample size to improve the statistical significance of the results.

2. Public charging infrastructure in Japan – A stochastic modelling analysisInfoDetails

   Julian Rominger, Csaba Farkas, 2017

   Electric vehicles (EV) are treated as a breakthrough technology in the automotive market. The novelty of this technology also implicates that the incidence of these vehicles worldwide is still low. An important issue regarding EVs is the existence of proper charging infrastructure as waiting at charging stations due to an inadequate number of chargers can discourage EV owners. However, as the number of EVs and charging stations are low at present, real world experience is not available, so computer simulations are required for the planning of such charging stations. We developed a stochastic model in this paper that includes driving and charging behaviour of EV owners in Japan. The model is based on Monte Carlo methods and was implemented in MATLAB. We conducted simulations with this model to find out whether the existing infrastructure is adequate for the charging of a large number of EVs. The results indicate that Japan is well prepared for an increase in plug-in vehicles (PHEVs) in the near future: currently the country has 6 fast chargers for 100 electric cars and for this ratio - on average -, waiting probability at DC (direct current) fast chargers ranges lower than 5%, which is an acceptable value for EV owners. If, however, the ratio decreases, waiting probability increases exponentially.

Konferenzbeitrag (5)

1. Forecasting of Frequency Containment Reserve Prices Using Econometric and Artificial Intelligence ApproachesInfoDetails

   Emil Kraft, Julian Rominger, Vincent Mohiuddin, Dogan Keles, 2019

   The forecasting of control reserve prices is essential in order to participate reasonably in the auctions. Having identified a lack of related literature, we therefore deploy approaches based on auto-regressive and exogenous factors coming from econometrics and artificial intelligence and set up a forecasting framework. We use SARIMA and SARIMAX models as well as neural networks and forecast based on a rolling one-step forecast with re-estimation of the models. It turns out, that the combination of auto-regressive and exogenous factors yields the best results compared to approaches solely considering auto-regressive or exogenous factors. Further, the artificial intelligence approach outperforms the econometric approach in terms of forecast quality, whereas for the further use of the generated models, the econometric approach has advantages in terms of interpretability.

2. Analysis of the German Continuous Intraday Market and the Revenue Potential for Flexibility OptionsInfoDetails

   Julian Rominger ; Manuel Losch ; Sebastian Steuer ; Katrin Köper ; Hartmut Schmeck, 2019

   As the share of energy from fluctuating renewable energy resources traded on the German power spot markets has risen over the past years, energy prices on these markets have become more volatile. Therefore, the opportunities for utilizing the flexibility of energy demand or supply to gain monetary benefits have increased significantly. Especially the EPEX Intraday Continuous power market appears to be a favorable market place for demand- and supply-side flexibility options as continuously changing prices for power products offer the possibility to profit from consecutive rescheduling up to only five minutes before delivery. The contribution of this paper is twofold. Firstly, we provide an analysis of the development of the German Intraday Continuous power market over the years 2015 to 2017, and secondly, we quantify the revenue potential for different flexibility options participating in this market. The results of this work show an increasing revenue potential over the course of the three years. The revenues equal up to 3.4 times the wholesale energy costs for solely consuming and up to 12.4 times for consuming and generating flexibility options.

3. Utilization of Local Flexibility for Charge Management of a Battery Energy Storage System Providing Frequency Containment ReserveInfoDetails

   Julian Rominger, Patrick Ludwig, Fabian Kern, Manuel Loesch, Hartmut Schmeck, 2018

   This paper estimates the potential to reduce market-based charging and discharging of a battery energy storage system (BESS) that provides frequency containment reserve (FCR) through (a) the utilization of degrees of freedom (DOFs) during reserve provision, and (b) the utilization of the flexibility of local power units (LPUs) at an investigated industrial site. In context of a of a real BESS providing 7 MW of FCR, the potential is quantified based on a simulation using real grid frequency data and real power profiles of LPUs at an industrial site for the year 2016. At the explored site, LPUs identified to provide charge management of the BESS include wind turbines (WT), a combined heat and power plant (CHPP), and power consumption by the fans of a heating, ventilation and air conditioning (HVAC) system. Results indicate that the energy charged and discharged through market-based transactions can be reduced by 56% and 66% respectively; however, the majority of these reductions are caused by the intelligent use of DOFs. Savings by using the flexibility of the mentioned LPUs can be attributed largely to the flexible operation of the HVAC system due to its highest availability and potential to substitute market-based charge events of the BESS.

4. Optimizing Bidding Strategies for the German Secondary Control Reserve Market: The Impact of Energy PricesInfoDetails

   Manuel Loesch, Sandeep Nainappagari, Julian Rominger, Hartmut Schmeck, 2018

   In the synchronized European grid, Secondary Control Reserve (SCR) is a key component to restore a stable grid frequency of 50 Hz. The German SCR market is based on a capacity price and an energy price. After being accepted into the reserve pool based on the capacity price, the energy price determines the position in the call merit order, and hence the probability of an activation. In this paper we present results of an ex-post simulation of the SCR market, based on publicly available data. Using our simulation, we quantified the share of SCR bid activations given different energy prices, and derived the profit potential for SCR providers. In addition, we investigated the development over the last years, recognizing that in particular positive SCR bids with a given energy price tend to be activated less often. By providing transparency regarding the relation between reserve energy prices and the share of activations, the insights presented in this paper can be used by balancing service providers in order to improve their SCR bids, or to validate the quality of bidding strategies of SCR aggregators.

5. Provision of frequency containment reserve with an aggregate of air handling unitsInfoDetails

   Julian Rominger, Fabian Kern und Hartmut Schmeck, 2017

   Following political strategy changes with the goal to reduce greenhouse gas emissions, the German power system has experienced a great penetration of intermittent renewable energy sources. The volatile electricity generation of renewable energy sources requires greater flexibility not only on the electricity supply but also on the demand side. The ventilation of buildings represents a largely untapped resource for demand response measures such as control reserve. Due to the quick reaction speed and inertia of the air balance of supplied buildings, electric motors of air handling units qualify to provide frequency containment reserve. In this paper we present a system architecture according to standards by the German transmission system operators to provide frequency containment reserve with an aggregate of air handling units. At an industrial site containing workshop and office buildings a prototype of the system has been installed and prequalified by the transmission system operators to provide almost 300 kW of frequency containment reserve.

Sonstiges (4)

1. Method for providing control power for stabilizing the grid frequency of a power grid and/or for fulfilling a power schedule, control device for a technical installation, and technical installationInfoDetails

   Dominik Becks, Michael Müller-Ruff, Julian Rominger, 2019

   The invention relates to a method for providing control power for stabilizing the grid frequency of a power grid and/or for fulfilling a power schedule of the power grid, wherein the control power is provided by means of an assembly and the control power to be provided is specified as a control power setpoint value in each of successive control cycles. According to the invention, the assembly is provided by a plurality of technical device units and each of the device units has a device characteristic value and, for each device unit, a control apparatus controls a device power of the device unit to a device setpoint value, and that for each device unit an associated portion of the control power to be provided is defined as the ratio of the device characteristic value of the device unit in question to the respective device characteristic values of the other device units or of all the device units and the associated device setpoint value is set in accordance with the control power setpoint value and the associated portion.

2. System for reducing load peaks in an electrical systemInfoDetails

   Alexander Funke, Jens Berger, Julian Rominger, 2019

   The invention relates to a method for controlling at least one controllable system component in an electrical system, wherein the system is connected to an electrical supply network via a network connection and a measurement value of a performance from the supply network is detected for each individual successive time interval, and if one of the measurement values is larger than a predetermined threshold value, the performance is guided below the threshold value by switching electrical compensation power. According to the invention, the measurement value of the current time interval is predicted as a forecast value using a control device at at least one time within the current time interval in question by using forecast data to add a future course of the performance extending to the end of the time interval, and thereby deciding during the time interval how much compensation power is necessary.

3. Verfahren zum Betreiben eines elektrischen Energiespeichers für eine RegelleistungserbringungInfoDetails

   Dominik Becks, Alexander Funke, Julian Rominger, 2019

   Die Erfindung betrifft ein Verfahren zum Betreiben eines elektrischen Energiespeichers, beispielsweise eines Batteriespeichers. Mittels des Energiespeichers wird Regelleistung in einem elektrischen Übertragungsnetz oder Stromnetz erbracht. Zu der Erfindung gehören auch eine Steuervorrichtung für eine Ladezustandssteuerung des Energiespeichers sowie ein Energiespeichersystem.

4. Erbringung von PrimärregelleistungInfoDetails

   Dominik Becks, Michael Müller-Ruff, Julian Rominger, Tillmann Laux , 2018

   Die Erfindung betrifft ein Verfahren, welches es erlaubt mit einem Aggregat an variabel regelbaren technischen Einheiten eine Primärregelleistung in einem Energieversorgungsnetz zu erbringen und hierbei sicherstellt, dass die benötigte Primärregelleistung auch bei sich ändernder Flexibilität der einzelnen Einheiten tatsächlich erbracht werden kann. Ferner betrifft die vorliegende Erfindung eine entsprechend eingerichtete Vorrichtung sowie eine Systemanordnung aufweisend die Vorrichtung. Ferner wird ein Computerprogrammprodukt mit Steuerbefehlen vorgeschlagen, welche das Verfahren implementieren beziehungsweise die Vorrichtung und die vorgeschlagene Systemanordnung zumindest teilweise betreiben.

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Kontakt

Telefon: +49 721 9654-556
E-Mail: rominger@dont-want-spam.fzi.de

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