Ulf Häger's research while affiliated with Technische Universität Dortmund and other places
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Publications (48)
Anticipating and relieving congestions is an ongoing challenge for transmission system operators. Distributed grid‐scale battery energy storage systems enable operators to shift power flows and remedy congestion through virtual power lines and grid boosters. This paper includes battery energy storage systems in a combined preventive and curative co...
As the power system is undergoing fundamental changes in the scope of the energy transition, the existing regulatory structure lacks the necessary components to cope with these changes. More decentralized energy resources are being integrated into the system on lower voltage levels, while coordination of these, especially considering the limited gr...
This paper demonstrates the real-time applicability of an automated curative power flow control system in a High Voltage (HV) grid. The system is realized in a laboratory environment as an agent-based control algorithm implemented on commercially available hardware. Measurements and control signals are exchanged between a Real-Time Simulation (RTS)...
![Representation of the chosen grid locations [41]](publication/360442859/figure/fig5/AS:11431281179069140@1691150825740/Representation-of-the-chosen-grid-locations-41_Q320.jpg)
The drastic increase in distributed energy resources (DERs) leads to challenges in the operation of distribution systems worldwide. While several solutions for grid monitoring and control are available on the market and in literature, this research is the first of its kind aiming to supervise the grid by providing a modular configurable unified har...
Transmission congestion is a relatively common phenomenon that occurs in the operation of the power system. When the congestion could not be handled efficiently, it will lead to substantial economic costs for system operators. Many of the existing solutions are based on open-loop corrective methods, which do not completely guarantee good and reliab...
In the context of more volatile grid operation, the probability of limit violations on current carrying assets is increasing. These are avoided as far as possible in advance by congestion management processes, but unforeseen situations can arise in the future more frequently. This leads to the need of rapid remedial actions to relieve circuits ther...
Future urban energy systems planning, incorporates various interconnected components including smart grids, electric vehicles, renewable energy sources, heating, and cooling systems. This chapter is the brief introduction to the data-driven energy system with special focus on methods and algorithms for hedging against the ever-increasing uncertaint...
This chapter gives the brief introduction to the management of energy in smart grids focusing on the hybrid renewable energy systems, load and generation forecasting, new grids structure, and smart technologies. The classification of smart infrastructure systems and smart energy management systems is provided and discussed with focus on both demand...
With the flexibility potential of grid users and energy storage facilities as well as the intelligent use of power flow controlling equipment, a higher utilization of the grid can be achieved in order to integrate more generation from renewable energies into the grid. In addition to the further development of previous preventive approaches to ensur...
![Figure 1: Overview of developed CMS [9]](publication/336556846/figure/fig1/AS:814245201588226@1571142592784/Overview-of-developed-CMS-9_Q320.jpg)
This paper describes how flexibility of medium voltage systems can be used for operation of high voltage systems. This is explained using the example of a congestion management system for high voltage networks developed in the research project IDEAL. First, it is explained to what extent flexibility is required for high voltage system operation. Af...
The integration of the voltage-source converter based high voltage direct current (VSC-HVDC) system makes the set-point of its active power adaptive to the changes in the power flow, and contributes to the curative congestion management. To further exploit the dynamic behavior of a hybrid AC/DC power system in curative congestion management scenari...
This paper describes an approach to estimate the flexibility of an Active Distribution Network (ADN) to provide ancillary services across voltage levels by the regulation of the power flow over the transmission-distribution interface. Therefore, a modelling framework is introduced to describe and discuss the impact of time-variant and time-invarian...
Instability on direct-current (DC)-side resonance occurs if the connected converters interact with the DC network. In this study, a single-input-single-output transfer function is built to investigate the DC-side resonance of modular multilevel converter-based high-voltage DC (MMC-HVDC) system. The small signal model is developed for the DC-side re...
With the rapid increase of renewable energy sources and power electronic converters in the power system, the inertia of the power system is declined and the stability problem is more serious than ever before. In this paper, a virtual synchronous generator (VSG) control strategy is proposed to enable the voltage-source converter-based multiterminal...
![Fig. 3: Topology of the IEEE Nordic Test System (based on [25])](profile/Lena-Robitzky/publication/321290789/figure/fig2/AS:669286792167426@1536581814039/Topology-of-the-IEEE-Nordic-Test-System-based-on-25_Q320.jpg)
Changing dynamics of power systems caused by the migration from conventional to distributed energy sources increase the risk of blackouts due to voltage instability, especially in case of unforeseen network conditions (e.g., (N-k)-cases). To enable a both secure and efficient power supply, novel monitoring and emergency control systems for the iden...
This paper explores how Cross Voltage Level Control Methods affect the way Active Distribution Networks (ADNs) dynamically behave. To this end, an ADN control scheme is described which aims to regulate the active and reactive power flow between distribution and transmission grid for the provision of ancillary services across voltage levels. The des...
This paper proposes an adaptive droop control (ADC) strategy for the voltage source converter (VSC) based multi-terminal high voltage direct current (VSC-MTDC) system, which enables the VSC-station to provide frequency regulation for onshore ac grids. A V-I-f characteristic is derived to establish the relationship between the frequency deviation an...
Due to politically defined goals to raise the share of renewable energy, the landscape of electricity production has changed in recent years. Normally, a decision to invest in new generation capacity by generation companies is often based on profit maximization criteria. Criteria considering the costs resulting from the required expansion or constr...
The full set of information on the study "Flexibility concepts for the German power supply in 2050. Ensuring stability in the age of renewable energies" can be found on
http://www.acatech.de/de/aktuelles-presse/dossiers/dossier-stromversorgung-2050.html
and the main document with the study in English is available on
http://www.acatech.de/de/publika...
Increasing complexity and uncertainty of power system operation have led to a rising interest in decentralized control concepts as a complement or alternative to centralized control. For decision-making on appropriate control actions, such approaches need to perform analyses of the system state and the estimated impact of control actions basing on...
This study is about the so-called “traffic-light” model for Swiss power distribution networks. At the core of this model, originally proposed for Germany, there is a flexibility market designed to harness local or regional flexibilities in power generation and use in congestion period. It is one of several options to ensure market and system stabil...
Wie groß ist der Speicherbedarf in Deutschland in der weiteren Umsetzung der Energiewende? Welche Rolle spielen Batteriespeicher, Pumpspeicher, Power-to-Gas etc. im Kontext anderer Flexibilitätsoptionen auf den verschiedenen Netzebenen? Wie entwickelt sich der Markt für Batterien und Wasserstoff? In unserer Agora-Speicherstudie haben wir auch erstm...
A coupling of the electrical networks of ENTSO-E and IPS/UPS would result in a power system unprecedented in size and complexity, and potentially could have severe effects on operation and stability.
Constructing new transmission lines is difficult due to environmental specifications and missing public acceptance. A temporary alternative is the integration of Power Flow Controllers (PFC) in order to dynamically redirect power flows.
Since the early stages of development of interconnected electric power systems throughout the world, the issue of how to best perform network control functions has been faced by the respective system operators. The key parameters that need to be continuously handled and controlled by operators in order to keep their HVAC (High Voltage Alternating C...
Emergency control, including emergency operation dispatching and automatic emergency control that provides reliability and survivability of the electric power grids plays an important part in controlling the operating conditions of large Electric Power Systems (EPS)s, as introduced in the previous chapter. Emergency control is performed by the tech...
Based on the general requirements, particular consideration has to be given to different scenarios of joint operation of the ENTSO-E- and IPS/UPS-systems. To provide a basis for the following investigations in this book, this chapter focuses on the development of an aggregated network model of these power systems which will be used as general test...
The interstate integration of power grids provides multiple advantages concerning operational security as well as energy trading. Due to these facts the Central European Power System (ENTSO-E-CE, formerly UCTE) expands continually since its establishment and the ties to other interconnected systems like NORDEL grow stronger and further new ties wit...
A neural multi-agent-based approach for system monitoring and preventing large-scale emergencies in power systems is presented in this paper. The automatic emergency control process is represented as a neural multi-agent system with hierarchical architecture. The proposed system consist of two main parts: the alarm trigger, a Kohonen neural network...
This present aims at describing the current way of coordinating power flow controlling devices in Europe and gives an overview about promising methods to be applied in the future. However, the idea of coordinating such devices is rather new. The first phase-shifting transformers in Europe with an overlapping sphere of influence were installed very...
Flexible alternating current transmission systems (FACTS) make it possible to increase transmission network capacity while enhancing system flexibility, reliability, security and controllability, with limited environmental impact.
This chapter, after illustrating the technical characteristics of the different families of FACTS, provides some econom...
Die Betriebsführung elektrischer Transport- und Verteilnetze wird zunehmend dynamischer. Gründe hierfür sind einerseits die Herausforderungen durch hoch ausgelastete Netze sowie volatile Einspeisung, auf die die Netzbetreiber rechtzeitig reagieren müssen, andererseits der zunehmende Einsatz schnell regelbarer Betriebsmittel und leistungsstarker Kom...
(N-1)-security is a decisive impact factor on both transmission system operation and network planning as it constrains the permissible states of the grid. Ensuring an (N-1)-secure operation and planning is a particular challenge in the presence of uncertainties. The inefficiency due to constrained network operation can be alleviated by fast correct...
The European electrical transmission network is operated increasingly close to its operational limits due to market integration and increased feed-in by renewable energies. For this reason, innovative solutions for a reliable, secure and efficient network operation are requested. The application of self-organizing systems promises significant poten...
This study presents a robust wide-area stabilising control approach to enhance the stability of large power systems, including high-voltage direct current (HVDC) transmission. It can utilise both the wide-area measurement data and the HVDC supplementary modulation function and select suitable feedback signals for implementing a quick and robust wid...
Zusammenfassung
Energiemarktaktivitäten und die zunehmende Windenergieeinspeisung führen zu einer erhöhten Belastung der elektrischen Energieübertragungsnetze. Um dabei entstehende Netzengpässe zu beheben sind Netzausbaumaßnahmen erforderlich. Neue Leitungen können aufgrund von Umweltauflagen nur zögerlich errichtet werden. Leistungsflussregler (LF...
This chapter presents the following approaches and developments: (1) the approach to power system state estimation based on structural and functional decomposition. PMU measurements are used to coordinate the solutions obtained in individual areas; (2) a non-iterative method to calculate voltage magnitude and phase at all the buses, allowing the st...
An overall increase in power demand together with the liberalization of the power markets and the integration of high capacity unpredictable renewable resources (e.g. wind power) pose a challenge to transmission networks. Network operators have to guarantee a stable and efficient operating of the grid. A way to improve the stability and efficiency...
voropai@isem.sei.irk.ru KEYWORDS Out-of-step operation, prevention, elimination, selective automatic system, PMU.
Citations
... Lindner et al. [6] integrate grid-scale battery energy storage systems (BESS) in a combined preventive and curative congestion management optimization. It analyses the impact of two operational strategies of the German transmission grid. ...
... At TU Dortmund University, the Smart Grid Technologies Lab (SGTL) has been setup to enable component testing using HIL approaches as well as holistic and system-level testing [6]. In the past, Power-Hardware-in-the-loop component testing (PHIL) of Photovoltaic inverters and distributed series reactors took place in the lab [7], [8]. ...
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... That means that the software is specific to a particular hardware, and updating or integrating new algorithms from other users becomes an arduous task every time. To enhance the feasibility of interoperability, previous work at the TU Dortmund University dealt with creating algorithms based on software using a standard developed for the automation of distribution grid substations [16], [17]. Thus, the control algorithms are configured using data models according to IEC 61850-7-3 [18] and IEC 61850-7-4 [19]. ...
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... It consists of different layers to ensure voltage/frequency stability, power sharing and optimal operation. Hierarchical control is defined as having the following four levels, from the fastest to the slowest level [11,29,38,52,56,170,[174][175][176]: ...
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... An example of HES is an energy system that produces energy from a solar system, storage battery and electrical generators. [31][32][33] Sawle et al provided a review of HES based on PV and wind sources of energy with a comparative analysis with an offgrid hybrid system. 34 Others take benefit from the site's topography and used the pumped hydropower as potential-energy storage integrated PV/wind HES to supply 1.2 MW of electricity to a community in the southern region of Libya. ...
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... The use of SASO is intended for further projects, e.g. non-commercial but funded research & development projects [6]. Based on existing "open-loop" architecture, different research results and derived prototypes can be shown in a practical environment while ensuring that the productive control system is not interfered at any point. ...
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... In addition, the aggregated flexibility potential of FPUs can be used to support overlaid voltage levels, for example with reactive power compensation, redispatch or system balancing as proposed in [5] and shown [6]. One approach to handle large numbers of decentralized FPUs and to facilitate their integration into grid operation is offered by the fast aggregation of the flexibility potential, introduced in [7]. ...
... Summarizing the above publications, the following features of the notion of the flexibility of power systems concerning other similar notions and properties can be noted. Many definitions of the flexibility of power systems considered in [1][2][3][4][5][6][7][8][9][10] are quite close to the definition of the security of power systems, which means the ability of the system to withstand sudden disturbances without unintended impacts on electricity consumers [15]. By [16], the security of power systems is understood as the property of the system to maintain the specified modes of operation under changing conditions, failures of elements, and sudden disturbances. ...
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... One possibility to approximate P = proj Z X , are samplingbased heuristics from power system applications [63][64][65][66][67][68]. These heuristics sample points {z l } l∈T ={1,...,T } ∈ P based on whichP is constructed. ...
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... While some publications exist on communication latency in smart grids, they typically relate to other specific smart grid functions and neglect other forms of ICT errors besides latency. For example, in [13] and [14], the impact of communication latency on bus voltages in centrally controlled microgrids has been investigated, and [15] and [16] demonstrate the positive impact of software-defined communication networks on the critical sensitivity of multi-agent-based distribution grid control towards ICT latency. ...
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