A5036471902- Microgrid Control and Optimization
- Advanced DC-DC Converters
- HVDC Systems and Fault Protection
- Smart Grid Energy Management
- Real-time simulation and control systems
- Optimal Power Flow Distribution
- Power System Optimization and Stability
- Islanding Detection in Power Systems
- Advanced Battery Technologies Research
- Multilevel Inverters and Converters
- Silicon Carbide Semiconductor Technologies
- Electric and Hybrid Vehicle Technologies
- Power Quality and Harmonics
- High-Voltage Power Transmission Systems
- Electromagnetic Compatibility and Noise Suppression
- Photovoltaic System Optimization Techniques
- Embedded Systems Design Techniques
- Frequency Control in Power Systems
- Power Systems and Renewable Energy
- Smart Grid Security and Resilience
- Wind Turbine Control Systems
- Real-Time Systems Scheduling
- Electrostatic Discharge in Electronics
- Superconducting Materials and Applications
- Electric Vehicles and Infrastructure
Karlsruhe Institute of Technology
2020-2025
Kiel University
2014-2020
Institute on Taxation and Economic Policy
2020
Institute of Electrical and Electronics Engineers
2020
University of Bari Aldo Moro
2011
The increasing proliferation of renewable energy resources and new sizeable loads like electric vehicle (EV) charging stations has posed many technical operational challenges to distribution grids [1]. Encouraged by attractive tax incentives promotion policies, local grid end consumers are becoming not only electricity but, in cases, also producers. actual system limits the use resources, offers poor EV infrastructure, is based on a unidirectional information flow from sources control centers.
The solid-state transformer (SST) was conceived as a replacement for the conventional power transformer, with both lower volume and weight. smart (ST) is an SST that provides ancillary services to distribution transmission grids optimize their performance. Hence, focus shifts from hardware advantages functionalities. One of most desired functionalities dc connectivity enable hybrid system. For this reason, ST architecture shall be composed at least two stages. standard design procedure kind...
The higher variability introduced by distributed generation leads to fast changes in the aggregate load composition, and thus power response during voltage variations. smart transformer, a electronics-based distribution transformer with advanced control functionalities, can exploit dependence on for providing services transmission grids. In this paper, two possible applications are proposed: 1) overload means of action 2) soft reduction method, that reduces consumption avoiding...
The massive integration of distributed generation in the grid poses new challenges to system operators, like reverse power flow from low voltage (LV) medium (MV) grid. In case high DG production and load absorption, rises line reaching upper limit. At this regard smart transformer (ST) offers a possibility limit MV grids. ST can adapt waveform modifying frequency order interact with local generation, that are normally equipped droop characteristic. However, when fast change is applied avoid...
Residential dc microgrids and nanogrids are the emerging technology that is aimed to promote transition energy-efficient buildings provide simple, highly flexible integration of renewables, storages, loads. At same time, mass acceptance slowed down by relative immaturity technology, lack standardization general awareness about its potential. Additional efforts from multiple directions necessary this increase market attractiveness. In near-term, it likely will be connected conventional ac...
Abstract This paper presents a roadmap to the application of AI techniques and big data (BD) for different modelling, design, monitoring, manufacturing operation purposes superconducting applications. To help superconductivity researchers, engineers, manufacturers understand viability using BD as future solutions challenges in superconductivity, series short articles are presented outline some potential applications solutions. These futuristic routes their materials/technologies considered...
DC faults are critical events for the multi-terminal HVdc protection systems, where knowing fault time is fundamental in protections design. Existing literature analyzes with simulations or complex analysis, requiring large computational effort and they not robust to parameters variations. Furthermore, standard approaches rely on simplified modular multilevel converter (MMC) models neglecting influence of control loops dynamic. As result, prediction node voltages especially dc currents...
This letter proposes a new on-line load sensitivity identification by means of power electronics-based devices. Applying voltage and frequency perturbation measuring the consumed loads, proposed method computes in real time dependency active reactive power. In this letter, smart transformer application has been proposed, but is general for any electronics converter able to influence dynamically grid.
Large renewable energy systems, e.g., photovoltaic and wind turbine, are connected to grid, which is usually weak, with long lines. This degrades power system stability reliability. Additionally, the magnetic characteristic of a conventional transformer (CPT) implies slow dynamic leads grid current harmonic too high when speed low irradiance weak. paper proposes parallel connection solid-state transformer-based smart CPT not only reduce rating, but also support voltage amplitude improve...
In the last years, energy production share of power electronics-based generators has kept increasing with respect to synchronous generation. These electronics-resources do not offer rotational inertia, resulting in a decrease total system inertia and thus larger frequency deviations during disturbances. Among several corrective solutions studied literature, controlling load consumption is promising one. Fast response widely distributed grid, control able work as reserve (both upward...
The more electric aircraft concept aims at increasing the amount and power of electrical subsystems on next generation aircraft. One major challenges in this framework is that generated by means generators connected to jet turbine shaft. In order satisfy peak demand overload conditions, are oversized, weight total cost operation. Possible solutions problem decrease size generator provide with storage systems. As an alternative, load disconnection during (load-shedding) can be enforced...
Investigations of the dynamic behaviour power electronic components integrated into electric networks require suitable and established simulation methodologies. Real-time represents a frequently applied methodology for analyzing steady-state transient behavior systems. This work introduces guideline on how to model electronics converters in digital real time simulators, taking account trade-off between accuracy required computation time. Based this concept, possible execution approaches with...
In the past, frequency dependency has often been neglected in load modeling. However, volatility of is likely to increase future grid scenarios. To assess novel strategies flexibility distribution grids, it becomes crucial accurately model power response connected loads larger fluctuations. The experimental study presented this paper aims provide insights into behavior modern devices range 50±6 Hz. three under test represent commonly used technologies low-voltage grids. For active and...
This paper introduces a novel control approach that equips inverter-based loads in low-voltage DC Microgrid with grid support capabilities, relying solely on local measurements. The is generalized for various load types—constant impedance (Z), constant current (I), and power (P)—collectively termed ZIP loads. Experimental validation real-world setup demonstrates the superiority of proposed method over conventional proportional-integral (PI) control, demonstrating improved voltage regulation...
Renewable energy penetration in the low‐voltage grid faces several limitations due to current topology. Master/slave micro‐grids could help solving these issues, by offering additional services such as power management of distributed sources. In some cases, produced sources exceeds local consumption grid. The consequent reverse flow can be either dangerous (for medium voltage) or impossible a micro‐grid with limited storage). droop characteristic commercial inverter exploited avoid this...
Low-inertia power systems suffer from a high rate of change frequency (ROCOF) during sudden imbalance in supply and demand. Inertia emulation techniques using storage systems, such as flywheel energy (FESSs), can help to reduce the ROCOF by rapidly providing needed balance grid. In this work, new adaptive controller for inertia high-speed FESS is proposed. The damping coefficients vary combination bang–bang control approaches self-adaptive ones, simultaneously improve both nadir. performance...
The smart transformer (ST), a solid-state with control and communication functionalities, that interfaces medium voltage (MV) low (LV) grids, enables the of frequency in LV grid independently from MV one. In ST-fed distribution grid, ST can interact droop controllers local generators loads characteristic to power demand. However, most existing for converters cannot guarantee good harmonic under variable condition. To address this issue, frequency-adaptive scheme based on fractional-order...
A smart transformer (ST) can take over an important managing role in the future electrical distribution grid system and provide many advanced services compared to traditional transformer. However, risk is that functionality balanced out by a lower reliability. To address this concern, work conducts thermal stress analysis for modular multilevel converter (MMC), which promising solution medium voltage stage of ST. The focus put on mission profiles impact power semiconductor devices. Normal...
The high implementation of renewable energy systems (RESs) and the need to increase transmission capacity across Europe (e.g., north-south Germany) have resulted in integrated power electronics (PE)-based solutions electrical grids. PE allows more flexibility control over Solutions such as high-voltage (HV) dc flexible alternating current (FACTS) transfer capabilities while preserving system's safety providing reactive power). Additionally, PE-based solutions, which are characterized by fast...
In the last decades voltage regulation has been challenged by increase of power variability in electric grid, due to spread non-dispatchable generation sources. This paper introduces a Smart Transformer (ST)-based Medium Voltage (MV) grid support means active control ST-fed Low (LV) grid. The aim proposed strategy is improve profile MV grids before operation On-Load Tap Changer primary substation transformer, which needs tens seconds. realized through reactive injection AC/DC converter and...