11 results on '"Prostejovsky, Alexander Maria"'
Search Results
2. Large-scale provision of frequency control via V2G: The Bornholm power system case
- Author
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Zecchino, Antonio, Prostejovsky, Alexander Maria, Ziras, Charalampos, Marinelli, Mattia, Zecchino, Antonio, Prostejovsky, Alexander Maria, Ziras, Charalampos, and Marinelli, Mattia
- Abstract
This paper assesses the impact of electric vehicles (EVs) providing primary frequency regulation via vehicle-to-grid (V2G) technology. The aim of the work is to define a set of recommendations in order to guarantee a stable large-scale deployment of EV fleets as primary reserve providers. A realistic fleet model is proposed, which emulates the aggregated response of a number of EVs characterized by V2G hardware response times derived in laboratory tests. The effects of primary frequency control via EV fleets replacing conventional generating units are assessed with a sensitivity study in a single-bus power system with growing fleet sizes and response times. Two recommendations are derived to guarantee safe and stable operation: Recommendation 1 requires the share of EVs providing primary reserve to be smaller than the reserve from conventional units; Recommendation 2 requires response times below a given limit value, calculated as a function of the following power system parameters: the system inertia, the total primary reserve over the rotating generation capacity, and the employed droop gain. The full 60 kV power system of the Danish island of Bornholm is then employed to evaluate the validity of the proposed requirements on a real system with complex dynamics, non-linearities and voltage dependencies.
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- 2019
3. The Future Role of Human Operators in Highly Automated Electric Power Systems
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Prostejovsky, Alexander Maria, Brosinsky, Christoph, Heussen, Kai, Westermann, Dirk, Kreusel, Jochen, Marinelli, Mattia, Prostejovsky, Alexander Maria, Brosinsky, Christoph, Heussen, Kai, Westermann, Dirk, Kreusel, Jochen, and Marinelli, Mattia
- Abstract
In the wake of the widespread deployment of Renewable Energy Sources (RESs) and the introduction of other distributed energy technologies, the grid exhibits faster and more intricate dynamics. A lot of attention is therefore being put on automated grid management systems, which entail a shift in the role and tasks of human operators in the Control Rooms (CRs). Given the rapid pace of development, the question ultimately arises if human guidance is necessary at all to safely operate the grid. This work investigates the prospective role of the human operators in CRs under consideration of cognitive challenges in highly automated power systems, aiming to maintain safe and efficient grid operation. A review on relevant literature casts light on the scope of influence of automated grid management systems, the operational states of power system that will still require human assistance, as well as activities and interactions. Finally, recommendations on the design of Decision Support Systems (DSS) supporting humans in their future role are provided.
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- 2019
4. Decentralized and discretized control for storage systems offering primary frequency control
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Ziras, Charalampos, Prostejovsky, Alexander Maria, Bindner, Henrik W., Marinelli, Mattia, Ziras, Charalampos, Prostejovsky, Alexander Maria, Bindner, Henrik W., and Marinelli, Mattia
- Abstract
The provision of ancillary services is an additional revenue stream for the owners of inverter-equipped storagesystems, such as batteries and electric vehicles. As real demonstrations have shown, primary frequency control(PFC) is a suitable and economically viable service for small-scale energy storage (ES) systems. This paperproposes a decentralized stochastic control policy, which significantly reduces ES units’ losses when providingPFC. The proposed controller can be tuned to obtain the desired service reserve provision errors, while achievinga balance between tracking accuracy and efficiency. An extension of the algorithm significantly reduces theswitching rate of the devices by up to 95%. Analytical expressions for the reserve errors and the switching rates,dependent on the aggregation size and the controllers’ settings, are derived and verified by simulations.Simulation results show that the proposed controller can significantly reduce ES units’ losses when they areproviding PFC by 8–15.5%, while achieving the expected tracking pe
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- 2019
5. Recommendations on future development of decision support systems
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MCarthur, Stephen, Chen, Minjiang, Marinelli, Mattia, Prostejovsky, Alexander Maria, Bindner, Henrik W., Pertl, Michael, Soares, Filipe, Zuelli, Roberto, Tornelli, Carlo, Di Somma, Marialaura, Graditi, Giorgio, and Ciavarella, Roberto
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Deliverable 8.3 reports on the consolidation of experiences from visualisation, decision support prototypes experiments and recommendations on future developments of decision support systems
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- 2018
6. Robust Allocation of Reserve Policies for a Multiple-Cell Based Power System
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Hu, Junjie, Lan, Tian, Heussen, Kai, Marinelli, Mattia, Prostejovsky, Alexander Maria, Lei, Xianzhang, Hu, Junjie, Lan, Tian, Heussen, Kai, Marinelli, Mattia, Prostejovsky, Alexander Maria, and Lei, Xianzhang
- Abstract
This paper applies a robust optimization technique for coordinating reserve allocations in multiple-cell based power systems. The linear decision rules (LDR)-based policies were implemented to achieve the reserve robustness, and consist of a nominal power schedule with a series of linear modifications. The LDR method can effectively adapt the participation factors of reserve providers to respond to system imbalance signals. The policies considered the covariance of historic system imbalance signals to reduce the overall reserve cost. When applying this method to the cell-based power system for a certain horizon, the influence of different time resolutions on policy-making is also investigated, which presents guidance for its practical application. The main results illustrate that: (a) the LDR-based method shows better performance, by producing smaller reserve costs compared to the costs given by a reference method; and (b) the cost index decreases with increased time intervals, however, longer intervals might result in insufficient reserves, due to low time resolution. On the other hand, shorter time intervals require heavy computational time. Thus, it is important to choose a proper time interval in real time operation to make a trade off.
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- 2018
7. Report on the evaluation and validation of the ELECTRA WoC control concept
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Strasser, Thomas, Latif, Aadil, Leimgruber, Fabian, Syed, Mazheruddin, Guillo Sansano, Efren, Burt, Graeme M., Marinelli, Mattia, Prostejovsky, Alexander Maria, Rezkalla, Michel Maher Naguib, Merino-Fernández, Julia, Rikos, Evangelos, Ciavarella, Roberto, Nuschke, Maria, Coelho, Antonio, Guagliardi, Antonio, Cabiati, Mattia, Morch, Andrei Z., Degefa, Merkebu, Hänninen, Seppo, Pasonen, Riku, Calin, Mihai, Kahraman, Ozgur, Strasser, Thomas, Latif, Aadil, Leimgruber, Fabian, Syed, Mazheruddin, Guillo Sansano, Efren, Burt, Graeme M., Marinelli, Mattia, Prostejovsky, Alexander Maria, Rezkalla, Michel Maher Naguib, Merino-Fernández, Julia, Rikos, Evangelos, Ciavarella, Roberto, Nuschke, Maria, Coelho, Antonio, Guagliardi, Antonio, Cabiati, Mattia, Morch, Andrei Z., Degefa, Merkebu, Hänninen, Seppo, Pasonen, Riku, Calin, Mihai, and Kahraman, Ozgur
- Abstract
This report summarizes the evaluation and validation of the ELECTRA Web-of-Cells concept which has been implemented for the proof of concept in selected validation environments provided by the project partners. The performed experiments have been realized in simulations and in laboratory environments and showed the feasibility of the Web-of-Cells concept and integrated functions for balancing and voltage control. Future work is necessary to further refine the concept and functions and to focus the controller implementations on higher technology readiness levels.
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- 2018
8. Increased Observability in Electric Distribution Grids:Emerging Applications Promoting the Active Role of Distribution System Operators
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Prostejovsky, Alexander Maria
- Abstract
This thesis addresses supervision and control of horizontally integrated electric power systems, in which Distribution System Operators (DSOs) assume an active role. Focus lies on the technical possibilities emerging from the expanding Information and Communication Technology (ICT) and monitoring infrastructure in distribution grids. Strong emphasis is placed on experimental verifications of the investigated concepts wherever applicable. Electric grids are changing, and so are the roles of system operators. The interest in sustainable energy and the rapidly increasing number of Distributed Energy Resources (DERs) throughout the grid entail a range of challenges: vertical integration schemes, with a few bulk generators supplying mostly passive customers, are toppled; renewables are highly volatile; and the grid’s resilience to load changes is weakened due to fewer direct-coupled synchronous machines. The DSO is in a central position to all these developments. Their awareness of generation and consumption flexibility of customers and DERs brings DSOs in the position to be more actively involved in grid management. Several technical applications, emerging from the premise of increased observability in distribution grids, that promote this active role are explored in this work. Grid models are fundamental to power grid planning and operations, but quality and coverage of distribution grid models are typically less pronounced compared to transmission networks. The expanding monitoring and ICT infrastructure across the Low and Medium Voltage levels provides new, non-invasive opportunities to enhance topological knowledge, which is demonstrated on two different approaches. First, available measurements are used for estimating the π- parameters of lines and cables. The methodology handles noisy, unsynchronized data compromised by systematic measurement errors, and has been validated on generated and real data obtained from SYSLAB. Second, ICT allows for extending the model scope without a central topology storage. The presented binary connectivity extension approach preserves details of the local neighbourhood, which is augmented with information from remote areas that is gradually reduced in detail. Reduction performance is evaluated numerically as well as on the IEEE 906-bus European Low Voltage test feeder. Supervisory Control And Data Acquisition (SCADA) systems monitor and control the power grid, and enable human operators in control centres to interact with it. The rising number of data sources and faster grid dynamics are a challenge to static SCADA architectures, which is tackled by modern ICT means of distributed data acquisition, processing, and exchange. For that purpose, a Multi Agent System (MAS)-based framework for prototyping distributed applications was developed. Software agents represent power system elements, offering high-level application interfaces and flexible low-level data acquisition mechanisms, and a Common Information Model (CIM)-like abstraction layer in between. A distributed Situational Awareness (SA) concept is subsequently designed and tested on models of SYSLAB and the Power Networks Demonstration Centre (PNDC), focusing on two features. Related to topology reduction covered earlier, the first is dynamic gathering and representation of topological information distributed throughout the grid. The second feature is live data visualisation on top of the topologies, in which power balances and other data are queried on demand. Improved models and SA benefit the operation of interconnected power systems as a whole, exemplified on Load Frequency Control (LFC). While LFC will likely remain the Transmission System Operator (TSO)’s responsibility, DSOs play a major role due to their local awareness. The presented LFC approach consequently uses direct state observations to determine area imbalances, and actively involves primary devices in frequency control to achieve tuning-free secondary control. Stability proofs and performance studies with Automatic Generation Control (AGC) are conducted analytically, in simulations, and in SYSLAB, on a three-area power system. Considering the option of DSOs performing balancing tasks, a consecutive load mobility approach accounts for the fact that DSO areas are not necessarily self-sufficient. Missing power is covered by neighbouring areas to confine problems in a small region, which is demonstrated in SYSLAB on a two-area, grid-connected setup. The results highlight the advantages of harnessing the information obtained directly from the distribution grid for real-time supervision and control. Better models contribute to improved SA of DSOs, and distributed data exchange mechanisms allow the coordination of a multitude of DERs. Together, the proposed solutions will strengthen the DSO’s position to cope with current and future challenges. Regulatory issues concerning data ownership and privacy, as well as questions on the hierarchies between TSOs, DSOs, and third-parties like aggregators, are yet to be settled by the corresponding authorities, and are therefore not covered in the frame of this work. Nevertheless, with the current speed of development of technical solutions and regulations, near-complete observability of the electric grid will be achieved in the foreseeable future. Harnessing the increased observability already benefits the unbundling of electricity markets, and is imperative to ensure security of the grid.
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- 2017
9. Scenario-based approach adopted in the ELECTRA project for deriving innovative control room functionality
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Marinelli, Mattia, Heussen, Kai, Prostejovsky, Alexander Maria, Bindner, Henrik W., Catterson, Victoria M., Merino, Julia, Tornelli, Carlo, Marinelli, Mattia, Heussen, Kai, Prostejovsky, Alexander Maria, Bindner, Henrik W., Catterson, Victoria M., Merino, Julia, and Tornelli, Carlo
- Abstract
Here, the authors analyse the operator point of view of the Web-of-Cells concept defined in the EU project ELECTRA, by identifying operator tasks into the supervision of a highly automated power system, and the information requirements to facilitate appropriate operator situation awareness. The study outlines the methodology adopted, which is based on the cognitive work analysis framework, to provide an overview of the most interesting scenarios and to summarise the requirements analysis results. In order to derive required control room functionality, a set of relevant control room scenarios have been identified based on the Web-of-Cells control concept. The authors considered scenarios that challenge traditional control schemes, scenarios that caused major failures (i.e. blackouts), and scenarios that can be expected to appear in the future. For each scenario, information concerning network layout, triggering events, physical constraints, manually/automatic operations, operators' tasks, and relevant analytics have been analysed.
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- 2017
10. Experimental Validation of BDI Agents for Distributed Control of Electric Power Grids
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Issicaba, Diego, Rosa, Mauro A., Prostejovsky, Alexander Maria, Bindner, Henrik W., Issicaba, Diego, Rosa, Mauro A., Prostejovsky, Alexander Maria, and Bindner, Henrik W.
- Abstract
This paper presents initial laboratory experiments designed to test belief-desire-intention agent reasoning in a webof-cell context. The work introduces the application of the bridge between JASON and the Common Artifact Infrastructure for Agents Open Environments to agent and environment modeling, respectively. Belief-desire-intention reasoning is achieved through JASON’s engine while artifacts monitor and control grid devices using dedicated JAVA objects. Experiments have been conducted in SYSLAB, a testbed for distributed power system control and distributed solutions, located at the Risø campus of the Technical University of Denmark. Experimental results show the feasibility of applying belief-desire-intention reasoning to WoC control using a test case where tie-line power flow setpoints must be followed
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- 2017
11. Prostejovsky, Alexander Maria
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Prostejovsky, Alexander Maria and Prostejovsky, Alexander Maria
- Published
- 2014
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