A5046391029- Power Quality and Harmonics
- Power System Reliability and Maintenance
- Electromagnetic Compatibility and Noise Suppression
- Power Transformer Diagnostics and Insulation
- Microgrid Control and Optimization
- Smart Grid Energy Management
- Lightning and Electromagnetic Phenomena
- Power Line Communications and Noise
- Optimal Power Flow Distribution
- Magnetic Properties and Applications
- Advanced Electrical Measurement Techniques
- Thermal Analysis in Power Transmission
- Power System Optimization and Stability
- Islanding Detection in Power Systems
- Power Systems Fault Detection
- Wind Turbine Control Systems
- Advanced Battery Technologies Research
- Machine Fault Diagnosis Techniques
- Electrical Fault Detection and Protection
- Railway Systems and Energy Efficiency
- HVDC Systems and Fault Protection
- Smart Grid Security and Resilience
- Non-Destructive Testing Techniques
- Power Systems and Technologies
- Energy Load and Power Forecasting
Luleå University of Technology
2016-2025
Skellefteå Hospital
2014-2023
Clemson University
2021-2022
Dalhousie University
2018-2020
Stri (Sweden)
2005-2017
Eindhoven University of Technology
1989-2014
Chalmers University of Technology
1998-2013
Vattenfall (Sweden)
2012-2013
University of Córdoba
2013
Centro Nacional de Epidemiología
2013
This paper analyzes the feasibility of direct current for supply offices and commercial facilities. is done by analyzing a case study, i.e. to Department Electric Power Engineering, Chalmers University Technology, Gothenburg, Sweden. Voltage drop calculations have been carried out different voltage levels. A backup system reliable power designed based on commercially available batteries. Finally, an economic evaluation AC versus DC performed protection proposed briefly addressed.
This paper discusses the analysis of voltage disturbance recordings in time-frequency domain and time-scale domain. The discrete short-time Fourier transform (STFT) is used for domain; dyadic binary-tree wavelet filters theory explained with special emphases on data. Dyadic are not suitable harmonic Filter center frequencies bandwidths inflexible, results do give easy insight time behavior harmonics. On other hand, band-pass filter outputs from STFT well associated harmonics thus more useful...
This paper maps the expected and possible adverse consequences for power quality of introducing several smart distribution-grid technologies applications. The material presented in this is result discussions an international CIGRE-CIRED joint working group. following applications are discussed: 1) microgrids; 2) advanced voltage control; 3) feeder reconfiguration; 4) demand-side management. Recommendations given based on mapping.
It is shown in this paper that voltage sags experienced by three-phase loads, such as adjustable-speed drives, can be classified into four types. Each sag further characterized a magnitude and phase-angle jump. Relations between fault type, type load connection are presented. The transfer of through transformers discussed. jump directly related to the faulted phase, or phases, at point-of-common coupling fault.
Utility deregulation will have tangible and intangible effects on power quality requiring industry-wide action to maintain adequate standards. These are discussed in the first part of paper. The increasing trend towards more extensive use electronic control at generation, transmission utilization systems following has implications that affect standards, system simulation monitoring tools. paper reviews present methods available these areas achieve specified levels deregulated environment.
This paper analyzes the characteristic of voltage dips in power systems with special emphasis on unbalanced and electrical components analysis. A generalized dip model is built for all dips, taking into account fault types, transformer types load connections. It shows transformation different dips. The characterization results a so-called remaining complex (a magnitude phase angle shift) balanced as well factor, related to rotating machine contribution source impedance shown that factor...
This paper presents an expert system that is able to classify different types of power events the underlying causes (i.e., events) and offer useful information in terms quality. The uses voltage waveforms distinguishes dips (fault-induced, transformer saturation, induction motor starting) as well interruptions (nonfault, fault-induced). A method for event-based classification used, where a segmentation algorithm first applied divide into several possible events. tested using real...
The support vector machine (SVM) is a powerful method for statistical classification of data used in number different applications. However, the usefulness commercial available system very much dependent on whether SVM classifier can be pretrained from factory since it not realistic that must trained by customers themselves before used. This paper proposes novel voltage disturbances. performance proposed investigated when disturbance training and testing originated sources. experiments were...
A method is proposed for estimating inter-harmonic frequencies in power system voltage and current signals. The based on a spectrum-estimation known as ldquoestimation of signal parameters via rotational invariance techniquesrdquo (ESPRIT). To allow more reliable spectral estimation to cover nonstationarity the signal, sliding-window version ESPRIT introduced. This paper describes basic well ESPRIT. discusses application one synthetic three measurement It shown that allows very accurate...
After a brief historical introduction to the hosting-capacity approach, hosting capacity is presented in this paper as tool for distribution-system planning under uncertainty. This illustrated by evaluating readiness of two low-voltage networks increasing amounts customers with PV panels or EV chargers. Both undervoltage and overvoltage are considered studies here. Probability distribution functions calculated worst-case function number These distributions used obtain 90th percentile values...
There is a serious interest from the international standard-setting community in knowledge about voltage and current distortion frequency range 2 to 150 kHz, referred as supraharmonics. At same time, research ongoing at number of locations, but supraharmonics remains limited. This paper compares some properties harmonics An increase for individual devices observed association with decrease harmonic emission (i.e. below kHz). A proposal made setting limits this range. The based on existing...
This paper assesses the communication, information, and functional requirements of virtual power plants (VPPs). A conceptual formulation interoperability requirements, as well a comparative study their fulfillment by state-of-the-art communication techniques, is presented. VPP are then mapped against services information models IEC 61850 common model (CIM) utility automation standards. Proposals given for extensions standard to enhance interaction between controller distributed energy...
This paper presents a summary of the most important characteristics wind turbine generators applied in modern power plants. Various generator designs, based on classification by machine type and speed control capabilities, are discussed along with their operational characteristics, voltage, reactive power, or factor voltage ride-through behavior during short circuits, capabilities.
This paper applies the hosting-capacity method to a realistic distribution system. Under given circumstances hosting capacity for Distributed Energy Resources (DER) identifies degree of DER in power grid that can be accepted without endangering reliability or quality power. In this case study two limits setting were evaluated: overvoltage and overcurrent. Finally it is examined what extent increased with use real-time information calculation dynamic performance indications govern capacity....
A stochastic method is presented in this paper to estimate the future voltage unbalance a low-voltage distribution network with high-penetration of single-phase photovoltaic inverters (PVIs). The location and phase allocation PVIs are considered as input parameters for simulation. has been applied three different networks: two Sweden one Germany. In Swedish networks, 6-kW PVIs, it likely that contribution from exceeds 1%. 2% value unlikely be exceeded. German network, 4.6-kW between 1.35%...