Panagiotis N Papadopoulos

Panagiotis N Papadopoulos
University of Strathclyde · Department of Electronic and Electrical Engineering (EEE)

About

50
Publications
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383
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Introduction
I have joined the Department of Electronic and Electrical Engineering of the University of Strathclyde in 2017, as a Lecturer (Assistant Professor). My area of expertise is power system stability and dynamics under increased uncertainty. I am focusing on the challenges and opportunities arising due to the integration of new technologies, such as renewable generation and technologies introduced in the smart grid concept. I am also interested in power system applications of data analytics and machine learning to tackle complex problems related to power system stability.

Publications

Publications (50)
Article
Full-text available
To monitor network operation in real-time, power system operators have developed wide-area monitoring systems (WAMS). However, the centralized communication and information processing architecture of WAMS cannot be extended easily to distribution networks. In this aspect, a three-level distributed network monitoring architecture is proposed in this...
Conference Paper
Line current differential (LCD) protection is traditionally considered to be highly dependable and secure. However, the increasing penetration of converter interfaced sources (CIS) (e.g. wind, PV, HVDC systems, etc.) could significantly reduce the system fault level and change the fault characteristics, thus presenting challenges to the reliable op...
Article
Full-text available
Fault detection and protection of Superconducting Cables (SCs) is considered a challenging task due to the effects of the quenching phenomenon of High Temperature Superconducting (HTS) tapes and the prospective magnitude of fault currents in presence of highly-resistive faults and converter-interfaced generation. This paper presents a novel, time-d...
Article
The increasing penetration of distributed renewable energy sources drastically alters the dynamic characteristics of distribution networks (DNs). Therefore, several equivalent models have been recently proposed, to analyze more accurately the complex behavior of modern DNs. However, relatively simple models are still commonly used in practice for d...
Article
Full-text available
Nowadays, transmission system operators require higher degree of observability in real-time to gain situational awareness and improve the decision-making process to guarantee a safe and reliable operation. Digitalization of energy systems allows utilities to monitor the system dynamic performance in real-time at fast time scales. The use of such te...
Article
Full-text available
Wind turbine (WT) control is being adapted to enable inertia provision that supports network frequency on short timescales. Measuring the inertia contribution from wind turbines is critical to asses the provision of the service as well as understand the WT operation. However, inertia measurement methods disagree on the impact of the wind and how to...
Article
This paper addresses the problem of ‘quickest possible’ online transient stability assessment, by minimizing the decision time of combined event detection that might lead to a system split and unstable generator group prediction, from real-time wide area power system measurements. More importantly it does so by respecting predefined probabilistic e...
Article
Full-text available
Electric Vehicles (EVs) are becoming increasingly available and are expected to be a large part of the load in future power systems. EV chargers are a relatively new type of load and are mainly interfaced with the grid through power electronics. It is therefore important to investigate the impact they have on power system dynamic behaviour. In this...
Article
A methodology for online and offline dynamic stability assessment, suitable for power systems with high penetration of power electronics interface units is presented in this paper. The increasing penetration of renewable energy resources as well as changing market operations, new types of loads and storage technologies, are causing significant chan...
Article
This paper introduces a hybrid-methodology for online identification and clustering of generator oscillatory behavior, based on measured responses. The dominant modes in generator measured responses are initially identified using a mode identification technique and then introduced, in the next step, as input into a clustering algorithm. Critical gr...
Article
The paper introduces a probabilistic framework for online identification of post fault dynamic behavior of power systems with renewable generation. The framework is based on decision trees and hierarchical clustering and incorporates uncertainties associated with network operating conditions, topology changes, faults and renewable generation. In ad...
Article
Full-text available
This paper introduces a probabilistic framework for transient stability assessment (TSA) of power systems with high penetration of renewable generation. The critical generators and areas of the system are identified using a method based on hierarchical clustering. Furthermore, statistical analysis of several transient stability indices is performed...
Conference Paper
This paper presents a framework to analyze the impact of different penetration levels of renewable generation sources (RES) and consequent reduction in inertia on grid frequency. The developed methodology is demonstrated using three operating conditions of the network. For each operating condition, the decrease in the network loading is balanced by...
Conference Paper
A probabilistic approach to assess the transient stability of power systems with increased penetration of wind and Photo-Voltaic generation is presented in this paper. The impact on transient stability due to the intermittent behavior of Distributed Energy Resources (DERs) as well as due to their dynamic response when a disturbance happens is inves...
Article
System identification methods have been widely used for the study of low frequency electromechanical oscillations and the development of low order dynamic models. This paper introduces a hybrid frequency/time-domain approach to estimate the dominant modes contained in ringdown responses of power systems. Practical issues and solutions encountered i...
Conference Paper
Due to the integration of Distributed Energy Resources (DERs), both non-synchronous generators and energy storage technologies, the dynamic behavior of power systems is changing. The extent of the impact is yet to be fully investigated and quantified. Proper models, suitable for large scale studies but also representing all the DER control and prot...
Conference Paper
This paper compares the most commonly used ensemble decision tree methods for on-line identification of power system dynamic signature considering the availability of Phasor Measurement Units (PMU) measurements. Since previous work has shown that the surrogate split method included in classification and regression tree is not good enough to handle...
Conference Paper
In order to identify the dynamic signature of power systems, it is important to monitor the generator rotor angles. The rotor angles can be obtained either by direct measurements of the rotor position or by indirect calculation of rotor angle from voltage and current measurements. Considering limited availability of direct measurements of rotor ang...
Article
The dynamic performance of microgrids is of crucial importance, because of the increased complexity introduced by the combined effect of inverter interface and rotating distributed generation. This study presents a methodology for the investigation of the dynamic behaviour of microgrids based on measurements using Prony analysis and state-space bla...
Article
Proton exchange membrane fuel cells (PEMFCs) are devices that attract the interest for a variety of applications including portable devices, transportation and stationary power. Several models are available in the literature concerning PEMFCs with different modelling approaches. In this paper, two representative dynamic models are examined, one usi...
Conference Paper
Full-text available
In this paper the performance of four system identification methods is evaluated for the analysis of different power system configurations. The methods considered are: nonlinear least squares (NLS), Prony method, sub-space state space system identification (N4SID) and the prediction error method (PEM). Artificially created data distorted by noise a...
Conference Paper
Full-text available
Online measurements can be used for aggregate load modeling, taking advantage of the advent of smart grids. In this paper initial load modeling results are presented using measurements recorded in a laboratory scale microgrid. The examined microgrid configuration includes a load bank and an adjustable speed drive. A methodology for the identificati...
Article
Distributed Generation (DG) units connected to the distribution network, contribute to the increase of the system fault level. Hence the knowledge of the exact contribution to the fault level by each DG unit is very important. In this paper the calculation of the short circuit current in distribution networks with DG units is carried out following...
Conference Paper
Full-text available
In this paper the dynamic behavior of a microgrid is investigated using eigenanalysis and system identification techniques. A detailed nonlinear model of the microgrid is developed in Matlab/Simulink and is used to obtain a linearized approximation to perform eigenanalysis. Moreover, the system eigenvalues are also analyzed by applying a system ide...
Article
Full-text available
A dynamic equivalent black-box model, based on Prony analysis is presented. The proposed model is suitable for dynamic studies of microgrids, considering changes in the active and reactive powers, bus voltages, currents and frequency. The developed model is evaluated using simulation results obtained from a medium-voltage microgrid and test measure...
Conference Paper
In this paper measurement results from a low voltage microgrid test facility are presented and analyzed using a black box modeling methodology based on Prony analysis. Several test cases are investigated with the microgrid operating in grid-connected and islanded mode, including step changes in loads and distributed generation units. The black-box...
Conference Paper
Full-text available
Microgrids are small-scale highly controlled networks designed to supply electrical energy. From the operational point of view, microgrids are active distribution networks, facilitating the integration of distributed generation units. Major technical issues in this concept include system stability and protection coordination which are significantly...
Conference Paper
In this paper a dynamic equivalent model of a microgrid based on Prony analysis is presented. The model parameters are considered to be derived from measurements using parameter estimation techniques. Fourier analysis is also used to study the frequencies involved in the transient response of the system. A microgrid with synchronous generators and...
Conference Paper
The accurate evaluation of short-circuit currents is significant for the estimation of the maximum thermal and mechanical stress in electrical equipment and for the protection coordination of power systems. The IEC-60909 standard is widely used for the calculation of maximum and minimum short-circuit currents. The calculation according to the ANSI...
Conference Paper
Full-text available
In this paper the effect of the magnetizing inrush currents, occurring during the energization of transformers, is examined. A case study is presented for an industrial arrangement consisting of five large transformers and three generators. The transformers are modeled using the Hybrid/XFMR model implemented in the well known transients program ATP...
Conference Paper
This paper presents a dynamic Proton Exchange Membrane Fuel Cell Model (PEMFC) model based on mass balance and semi-empirical equations. A complete PEMFC System containing a Power Conditioning Unit (PCU) is also investigated and various scenarios are simulated to assess the behaviour of a grid-connected FC in a Distributed Generation (DG) network.

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Projects (2)
Project
The main objective of ACTIVATE project is to develop novel DSO-oriented and TSO-oriented ancillary service solutions. These solutions aim to address the emerging grid operation challenges caused by the increased DG penetration and especially by the intermittent nature of DRESs. The ancillary services to be developed will be based on exploiting the functionalities the network assets offer including: (a) ESSs, (b) novel operational features of the grid-interfaced converters of ESSs and DRES units, which will be developed within this project, and (c) a new monitoring system architecture for active distribution networks (ADNs) based on measurements acquired locally at the point of common coupling (PCC) of the DRES units. This project will contribute to the increase of supply reliability and RES penetration, in an attempt to meet the targets European Union has set to improve sustainability, flexibility, and efficiency in the electricity sector.