A5045156629- Power Systems Fault Detection
- Power System Reliability and Maintenance
- Power Transformer Diagnostics and Insulation
- Smart Grid Security and Resilience
- Power Systems and Technologies
- High voltage insulation and dielectric phenomena
- Optimal Power Flow Distribution
- Islanding Detection in Power Systems
- Electrical Fault Detection and Protection
- Thermal Analysis in Power Transmission
- Microgrid Control and Optimization
- Power System Optimization and Stability
- Energy Load and Power Forecasting
- Smart Grid and Power Systems
- Smart Grid Energy Management
- Fault Detection and Control Systems
- Power Quality and Harmonics
- Geotechnical Engineering and Underground Structures
- Advanced Algorithms and Applications
- Hybrid Renewable Energy Systems
- Distributed and Parallel Computing Systems
- Electric Power Systems and Control
- Machine Fault Diagnosis Techniques
- Industrial Automation and Control Systems
- Lubricants and Their Additives
University of Duisburg-Essen
2025
Sentient Science (United States)
2020-2022
ABB (Switzerland)
2011-2019
AbbVie (United States)
2006-2017
Texas A&M University
2003-2005
Fault location in distribution systems is an important function for outage management and service restoration directly impacting feeder reliability. In this paper, a fault method based on matching calculated voltage sag data gathered at some nodes the network proposed. A characterization of sags utilized to reduce amount transferred data. The proposed can pinpoint precisely, applicable any complex with load taps, laterals, sub-laterals, single-phase loads, as well networks heterogeneous...
Aspects of terrestrial microgrids and ship power systems are examined. The work exposes a variety technical synergies from these two to effectively advance their technologies. Understanding overlap allows congruent efforts target both systems; understanding differences hinders conflict redundancy in early-stage design. paper concludes by highlighting how an can reduce the investment research resources.
Smart grid technologies leveraging advancements in sensors, communications, and computing offer new avenues for reliability enhancements of complex power grids by increasing the up-times reducing down times. This paper discusses various aspects smart monitoring proposes a mathematical model to assess its impact on reliability. Based multiple-state Markov chain model, failure repair rates components with without provisions are determined compared. The proposed formulation incorporates systems...
The need for distribution reliability enhancement in the age of smart grids requires reliable methods locating faults on systems leading to a faster service restoration and maintenance cost optimization. Given numerous fault location methods, one faces challenge objectively evaluating selecting most proper method. In this paper, two-step approach is proposed discussed ranking available that takes into account application requirements modeling limitations uncertainties. method formulated as...
The various distribution functions can encompass the diverse characteristics of magnetospheric plasma surrounding neutron stars in both hot and cold environments; however, Maxwell–Jüttner is so far widely used to characterize these plasmas. We aim analyze linear dispersion properties yielded from relativistic kinetic relation for star developed a numerical solver investigate plasmas with arbitrary velocity distributions focus on comparison kappa as analytical representatives. By considering...
This paper deals with the detection of incipient faults in underground distribution systems using online voltage and current measurements. The approach presented this is based on numerical modeling fault patterns established from oscillographic data. Specific energy features wavelet domain were extracted used task self-organizing map technology. modified errors are as a chronologically ordered sequence change problem specifically formulated for application. Three algorithms, namely,...
This paper discusses an automated measurement- based condition assessment system for underground distribution. The core components of the include rule-based and SVM-based pattern classifiers, which utilize novel features in time wavelet domains to classify cable patterns successfully into various classes on a measure severity. performance developed was tested evaluated using field data from distribution system. satisfactory classification results applications are presented discussed....
This paper deals with the subject of incipient faults in underground distribution systems and their progression over time leading to an eventual permanent failure. Field data recorded from feeder were analyzed both frequency domain identify symptom parameters characterize observed behavior. exploratory analysis sheds additional light on progressive characteristics nature these self-clearing advances fundamental knowledge effort detect such pre-mature failures before developing into a...
This paper presents a method for analyzing the operating performance of circuit breaker through trip/close coil current signature. A time-domain based approach is used to detect critical points in current, which can be by an intelligent system, human, or machine, assess and predict health breaker. The proposed algorithm computationally inexpensive easily embedded low cost microprocessor. Experimental data were verify robustness algorithm. provides practical extremum detection technique noisy...
IEC 61850 was proposed as a standard protocol for communications within the substation. In its current edition, does not cover outside substation, either with control center or other substations, instance remote protection. However, during recent years, there has been general belief that some features of can be efficiently utilized applications substation well. With advent new monitoring and technologies idea power system automation at distribution feeder level is crossing boundaries. such...
Substation Automation Systems (SAS) offer powerful, fast, and viable ways to design, automate, implement substation protection, control, monitoring functions in modern transmission distribution grids. Today's SAS - ore than ever rely on the adoption of IEC61850 as a worldwide standard for interoperability dependable peer-to-peer communications. Being based Ethernet computer networking technology, reliability issues associated with latency 61850-enabled is design consideration....
Transformer failures in transmission and distribution systems can cause substantial service interruptions take an extended period of time to recover from. Situational awareness a proactive way about the state-of-health transformers greatly help operators asset managers prepare for emergencies optimize scarce operations maintenance resources. A method is introduced estimate transformer fundamental parameters including turns ratio, series winding resistance, leakage inductance, shunt...
The ongoing proliferation of networked sensors and measurement devices in distribution systems pave the road for advanced automation control applications. This paper studies load modeling forecasting aspect feeder level operational planning. Using daily SCADA data, a ZIP model-based methodology was proposed that provides an aggregate model loads. approach benchmarked against existing method its application highlighted case study.
This paper presents a feasibility study on the application of pattern analysis techniques to classify load change transients and incipient abnormalities in an underground distribution cable lateral. The data were collected using on-line monitoring system installed residential area Dallas. A set features obtained from wavelet packet was evaluated. Methods dimensionality reduction employed overcome curse while preserving good classification rate. results k-nearest-neighbor (KNN) classifiers...
Transformer fault detection and diagnosis is becoming more important due to the restructuring of electric power industry. In this era deregulation, loading transformers their optimum capacity normal practice, which in turn applies high stresses on insulation increases probability occurrence internal short circuit winding faults. Such faults can lead catastrophic failure hence cause outages. Utilities other entities business are therefore exploring ways detecting these incipient stage....
This paper extends the application of Laplace Test Statistic for trend analysis and prediction incipient faults power systems. The extensions proposed in this consider situation where two parameters believed to contribute explicitly eventual failure are monitored. developed applied actual events provide promising results impending failure. It is demonstrated that by incorporating analysis, robustness outliers increased flexibility augmented increasing degrees freedom generation alarm signal.
Power system protection is a mission critical task that must be accomplished within the specified time limits so as to maintain stability, reliability, and safety of grid. As modern substations embrace integrated communications LAN-based substation automation systems using IEC61850 standard, network latency reliability issues continue influence decision making process move tasks (SAS) eliminate laborious costly copper hard-wiring in substations. Backup functions such circuit breaker failure...
A new fault location algorithm for two-end series-compensated double-circuit transmission lines utilizing unsynchronized two-terminal current phasors and local voltage is presented in this paper. The distributed parameter line model adopted to take into account the shunt capacitance of lines. mutual coupling between parallel zero-sequence network also considered. boundary conditions under different types are used derive formulation. developed directly uses on side series compensation (SC)...
This paper presents a new concept and approach for topology control switching in distribution systems by extending the traditional circuit to laterals single-phase loads. Voltage unbalance other key performance indicators including voltage magnitudes, line loading, energy losses are used characterize demonstrate technical value of optimizing system on per-phase basis response feeder conditions. The near-optimal is defined as series hierarchical optimization problems. proposed applied IEEE...
Ampacity or current rating for power apparatus is conventionally based on conservative ambient temperature assumptions neglecting the thermal inertia and diurnal load variations. While this has been a safe engineering practice in view of feeder instrumentation levels past, new opportunities are arising real-time ampacity revisions due part to proliferation line sensors meters. The data from smart meters can be effectively leveraged optimize loading real time. This paper studies overload...
This paper discusses an automated measurement based condition assessment system for underground distribution. The core components of the include rule-based and SVM-based pattern classifiers, which utilize novel features in time wavelet domains to classify cable patterns successfully into various classes on a measure severity. performance developed was tested evaluated using field data from distribution system. satisfactory classification results applications are presented discussed....
This paper deals with stochastic latency in modern substation automation systems based on IEC61850. In order to meet the real-time requirements of mission-critical protection functions, evaluations are necessary assess expected performance level. A thoroughly-analyzed system under various contingencies ascertains that communications design architecture is sufficiently fast and reliable. The presented methodology demonstrated via a case study related anti-islanding power plant. base were...
Summary form only given. Fault location in distribution systems is an important function for outage management and service restoration directly impacting feeder reliability. In this paper, a fault method based on matching calculated voltage sag data gathered at some nodes the network proposed. A characterization of sags utilized to reduce amount transferred data. The proposed can pinpoint precisely, applicable any complex with load taps, laterals, sub-laterals, single-phase loads, as well...
Automatic data processing and information retrieval is a desirable approach in dealing with the curse of large volume recorded for condition assessment equipment power systems. This involves developing methodology that utilizes inherent relationships to automate characterization system behavior. paper discusses practical process incipient abnormality an underground distribution detect failing equipment. The core components proposed consist feature extraction, mapping, clustering, rule...
As part of the substation and feeder automation systems, various intelligent electronic devices are typically utilized to record store digital data for protection monitoring purposes. However, time value these measurements has not been paid due attention. It is demonstrated that information obtained from temporal analysis data, online current in particular, offer a unique way prioritize resource allocation implement condition assessment methodology based on incipient behavior system. The...