| 1. |
- Gómez, Francisco José, 1982-
(författare)
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SEMANTIC INFORMATION AND PHYSICAL MULTI-DOMAIN MODELING AND SIMULATION FOR POWER SYSTEMS
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- There are different reasons for combining different modeling languages and simulationlanguages: Exchange of more detailed information about power network components, theirparameters and, most importantly, mathematical equations describing their behavior andthe exchange of a mathematical description, using equation-based languages (e.g.:Modelica), allows models to be detached from the mathematical solver. This leads to thedevelopment of new APIs within software tools, which can handle standardized modelinglanguage used for model implementation. Furthermore, the mathematical description ofmodels and the integration of new simulation standards, such as the FMI, could helpavoiding ambiguities on how power system models are implemented, by providingadditional means for the exchange of the complete description of models or parts of amodel between software tools.The aim of this thesis is to provide a new approach for the development of powersystems modeling and simulation software tools. The thesis is focused on proposing newmethods, based on available information and simulation standards for the exchange,modeling, and simulation of power systems dynamic models; and to show a proof ofconcept of the feasibility of the proposed methods. To this aims, the Common InformationModel (CIM) for the modeling and exchange of power system information is studied.Furthermore, the equation-based language Modelica is described and proposed with theaim of complementing the use of the CIM for the modeling and simulation of thosedynamics models.The application of these standards lead to a different view on the modeling andsimulation of power dynamic network models. The conventional view is that of black boxmodeling. The implementation of network model components is strongly connected to thesimulation software tool used for steady-state and dynamics calculations. Thus, a modeleror test engineer only has access to the parameters of a model and relies on the softwarecapabilities to calculate the states and the behavior of that model. This thesis proposes adifferent view per the application of the white box modeling and simulation concept: fulldetail and transparency on the development of a mathematical description of power systemcomponents and discrete events. Moreover, the combination of information standards withequation-based standards to produce network models allows full access and manipulationof the complete model details. Finally, transparency regarding the implementation ofsoftware tools can support either information-based, equations-based languages orsimulation standards, which are suitable for simulation of dynamic network models.
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| 2. |
- Gonzalez-Longatt, Francisco, et al.
(författare)
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Comparative Performance of Inverted-Based Generation using Synchonverter during Transient Stability Conditions
- 2022
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Ingår i: Proceedings - 2022 5th International Conference on Power Electronics and their Applications, ICPEA 2022. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1-7
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Konferensbidrag (refereegranskat)abstract
- Inverter-based generation (IBG) is critical in achieving a dependable and resilient electrical system while meeting the net-zero emission goal. The enormous integration of IBG tends to produce various issues, including reduced rotational inertia and reduced short circuit levels. Several scientific publications agree that the voltage source converters (VSCs) empowered by the so-called grid forming (GFM) control may provide a lasting answer for reaching the future net-zero IBG-dominated power systems. This paper presents a comparative analysis of the dynamic performance between IBR using synchronverter and a traditional synchronous generator (SG), where the specific concern is the transient stability conditions. DIgSILENT PowerFactory has been used for time-domain simulations using a test system, and numerical simulations considering an N-l event prove the significant benefit of GFN converter controls in providing active power during a voltage sag induced by a short circuit condition, allowing the system to endure longer short circuit durations.
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| 3. |
- Gonzalez-Longatt, Francisco, et al.
(författare)
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Frequency Support provided by Inverted Based-Generation using Grid-Forming Controllers: A Comparison during Islanded Operation
- 2021
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Ingår i: 2021 IEEE Electrical Power and Energy Conference (EPEC). ; , s. 113-118
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Konferensbidrag (refereegranskat)abstract
- Inverter based generation (IBG) is a necessary technology in the energy transition and reaching ambitious objectives of zero-net emission. However, the colossal penetration of IBG may create several issues. Using Voltage source converters (VSCs) equipped with the so-called grid forming control is thought of as a long-term solution of IBG-dominated power systems. This paper shows a glance of the dynamic performance during a system frequency event (SFE) considering three of the most common grid forming controller types used to emulate synchronous generation operation: Virtual Synchronous Machine (VSM), the Synchronverter and grid forming droop control; and compared with a classic synchronous generator (SG). Numerical results of time-domain simulations of a tests system show the enormous advantage of the grid-forming converters controls to provide an extremely fast frequency response when compared to the case of the traditional SG.
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| 4. |
- Gonzalez-Longatt, F., et al.
(författare)
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Intelligent Contingencgy Overload-Avoiding Control of BESS for Renewable-Rich Local Area
- 2022
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Ingår i: 2022 19th IEEE International Multi-Conference on Systems, Signals and Devices, SSD 2022. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1638-1643
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Konferensbidrag (refereegranskat)abstract
- An N-1 contingency can negatively affect the reliability and security of electrical power systems. A single transmission line outage can cause overload on the local healthy transmission systems, and actions are required to alleviate the overload. Traditionally the system operator uses two actions depending on the operating local area power balance: load shedding or power plant curtailment; both have consequences. This paper proposes the use of a Battery Energy Storage System (BESS) enabled with an intelligent overload avoiding control. The control is illustrated in a test system, and numerical simulations has demonstrated the suitability of the proposed approach.
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| 5. |
- Gonzalez-Longatt, Francisco M., et al.
(författare)
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Investigations of the Virtual Impedance Control Mode of Synchronverter in the Power Swing
- 2022
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Ingår i: 2022 International Conference on Smart Energy Systems and Technologies (SEST). - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- Power electronic converter (PEC) is a key element for the successful integration of novel technologies, PEC working as inverter at novel generation technologies are the decisive components to zero-net carbon emissions in the electricity systems. The colossal penetration of IBG tends to produce several issues in the power networks. There is a tendency to agree that the voltage source converters (VSCs) empowered with the so-called grid forming (GFR) control may provide a long-term solution for the inverter-based generation-dominated power systems. This scientific paper presents an investigation (based on numerical simulations) of the effect of the virtual impedance control mode of one grid forming control technique in the power swing of power systems. Numerical time-domain simulations on test systems are used to assess the effect of the virtual impedance (VI) control mode of the synchronverter (SynC) during a power swing. In both cases, the simulation-based investigation has shown evidence of using high and low virtual impedance in both cases, considering constant impedance and proportional over-current limitation. However, this paper concludes that further assessments are required.
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| 6. |
- Habibullah, Mohammad, et al.
(författare)
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On Short Circuit of Grid-Forming Converters Controllers: A glance of the Dynamic Behaviour
- 2021
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Ingår i: 2021 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America). - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1-5
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Konferensbidrag (refereegranskat)abstract
- Power electronic converter (PEC) is an enabling technology for the energy transition, but the massive integration of PEC raises several issues. The use of Voltage source converters (VSCs) enabled with grid forming control offer a long-term solution of PEC-dominated power systems. This paper shows a glance of the dynamic performance during short-circuit of three common grid forming controller types emulating synchronous generation are implemented: Virtual Synchronous Machine (VSM), the Synchronverter and grid forming droop control; and compared with a classic synchronous generator. Simulation results, considering a single generator contacted to an infinite bus, show the grid-forming converters' high-speed and different behaviour compared to the synchronous generator.
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| 7. |
- Ma, Mingxiao, et al.
(författare)
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Voltage Control in Distributed Generation under Measurement Falsification Attacks
- 2017
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Ingår i: IFAC-PapersOnLine. - : Elsevier. - 2405-8963. ; 50:1, s. 8379-8384
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Tidskriftsartikel (refereegranskat)abstract
- Low-voltage distribution grids experience a rising penetration of inverter-based, distributed generation. In order to not only contribute to but also solve voltage problems, these inverters are increasingly asked to participate in intelligent grid controls. Communicating inverters implement distributed voltage droop controls. The impact of cyber-attacks to the stability of such distributed grid controls is poorly researched and therefore addressed in this article. We characterize the potential impact of several attack scenarios by employing the positivity and diagonal dominance properties. In particular, we discuss measurement falsification scenarios where the attacker corrupts voltage measurement data received by the voltage droop controllers. Analytical, control-theoretic methods for assessing the impact on system stability and voltage magnitude are presented and validated via simulation.
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| 8. |
- Mueller, Sven Christian, et al.
(författare)
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Interfacing Power System and ICT Simulators : Challenges, State-of-the-Art, and Case Studies
- 2018
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Ingår i: IEEE Transactions on Smart Grid. - : Institute of Electrical and Electronics Engineers (IEEE). - 1949-3053 .- 1949-3061. ; 9:1, s. 14-24
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Tidskriftsartikel (refereegranskat)abstract
- With the transition toward a smart grid, the power system has become strongly intertwined with the information and communication technology (ICT) infrastructure. The interdependency of both domains requires a combined analysis of physical and ICT processes, but simulating these together is a major challenge due to the fundamentally different modeling and simulation concepts. After outlining these challenges, such as time synchronization and event handling, this paper presents an overview of state-of-the-art solutions to interface power system and ICT simulators. Due to their prominence in recent research, a special focus is set on co-simulation approaches and their challenges and potentials. Further, two case studies analyzing the impact of ICT on applications in power system operation illustrate the necessity of a holistic approach and show the capabilities of state-of-the-art co-simulation platforms.
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| 9. |
- Pan, Kaikai, et al.
(författare)
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Co-simulation for Cyber Security Analysis : Data Attacks against Energy Management System
- 2017
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Ingår i: 2017 IEEE Int. Conf. Smart Grid Commun.. ; , s. 253-258
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Konferensbidrag (refereegranskat)abstract
- It is challenging to assess the vulnerability of a cyber-physical power system to data attacks from an integral perspective. In order to support vulnerability assessment except analytic analysis, suitable platform for security tests needs to be developed. In this paper we analyze the cyber security of energy management system (EMS) against data attacks. First we extend our analytic framework that characterizes data attacks as optimization problems with the objectives specified as security metrics and constraints corresponding to the communication network properties. Second, we build a platform in the form of co-simulation - coupling the power system simulator DIgSILENT PowerFactory with communication network simulator OMNeT++, and Matlab for EMS applications (state estimation, optimal power flow). Then the framework is used to conduct attack simulations on the co-simulation based platform for a power grid test case. The results indicate how vulnerable of EMS to data attacks and how co-simulation can help assess vulnerability.
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| 10. |
- Pan, Kaikai, et al.
(författare)
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Combined data integrity and availability attacks on state estimation in cyber-physical power grids
- 2016
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Ingår i: 2016 IEEE Int. Conf. Smart Grid Commun.. - : IEEE. ; , s. 271-277
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Konferensbidrag (refereegranskat)abstract
- © 2016 IEEE. This paper introduces combined data integrity and availability attacks to expand the attack scenarios against power system state estimation. The goal of the adversary, who uses the combined attack, is to perturb the state estimates while remaining hidden from the observer. We propose security metrics that quantify vulnerability of power grids to combined data attacks under single and multi-path routing communication models. In order to evaluate the proposed security metrics, we formulate them as mixed integer linear programming (MILP) problems. The relation between the security metrics of combined data attacks and pure data integrity attacks is analyzed, based on which we show that, when data availability and data integrity attacks have the same cost, the two metrics coincide. When data availability attacks have a lower cost than data integrity attacks, we show that a combined data attack could be executed with less attack resources compared to pure data integrity attacks. Furthermore, it is shown that combined data attacks would bypass integrity-focused mitigation schemes. These conclusions are supported by the results obtained on a power system model with and without a communication model with single or multi-path routing.
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