Journal Papers

Local and Remote Estimations Using Fitted Polynomials in Distribution Systems

Conor Murphy, Andrew Keane,
Journal Paper IEEE Transactions on Power Systems published on 18/10/2016

Scaled Hardware Implementation of a Full Conversion Wind Turbine for Low Frequency AC Transmission

Ronan Meere, Ismail Ibrahim, Jonathan Ruddy, Paul McNamara, Terence O'Donnell,
Journal Paper Energy Procedia published on 01-09-2016

Synchronizing Torque Impacts on Rotor Speed in Power Systems

Mostafa Bakhtvar, Eknath Vittal, Kuan Zheng, Andrew Keane,
Journal Paper Power Systems, IEEE Transactions on published on 16/08/2016

Evaluation of passive ventilation provision in domestic housing

O. Kinnane; D. Sinnott; W.J.N. Turner,
Journal Paper Building and Environment published on 27/06/2016

Control Strategies for Automatic Generation Control over Multi-Terminal HVDC Grids

Paul Mc Namara, Ronan Meere, Terence O'Donnell, Seán McLoone,
Journal Paper Control Engineering Practice published on 24/05/2016

Low Frequency AC transmission for offshore wind power: A review

Jonathan Ruddy, Ronan Meere, Terence O'Donnell,
Journal Paper Renewable and Sustainable Energy Reviews published on 1-12-2015

A Comparison of VSC-HVDC with Low Frequency AC for Offshore Wind Farm Design and Interconnection

Jonathan Ruddy, Ronan Meere, Terence O'Donnell,
Journal Paper Energy Procedia published on 1-12-2015

Assessing Power System Flexibility for Variable Renewable Integration: A Flexibility Metric for Long-Term System Planning

Eamonn Lannoye, Pádraig Daly, Aidan Tuohy, Damian Flynn, Mark O'Malley,
Journal Paper CIGRÉ Science & Engineering published on 01/10/2015

Three-phase probabilistic load flow in radial and meshed distribution networks

Alexander C. Melhorn, Aleksandar Dimitrovski,
Journal Paper IET Generation, Transmission & Distribution published on 17/09/2015

Hierarchical Demand Response for Peak Minimisation using Dantzig-Wolfe Decomposition

Paul Mc Namara, Seán McLoone,
Journal Paper IEEE Transactions on Smart Grid published on 28/08/2015

The Effects of Wind Generation Capacity on Electricity Prices and Generation Costs: a Monte Carlo Analysis

Muireann Á. Lynch, John Curtis,
Journal Paper Applied Economics published on 24/08/2015

Challenges and barriers to demand response deployment and evaluation

Sheila Nolan, Mark O'Malley,
Journal Paper Applied Energy published on 15/08/2015

An ontology to represent energy-related occupant behavior in buildings. Part II - Implementation of the DNAS framework using an XML schema

T. Hong; S. D'Oca; S.C. Taylor-Lange; W.J.N. Turner; Y. Chen; S.P. Corgnati,
Journal Paper Building and Environment published on 13/08/2015

Allocation of wind capacity subject to long term voltage stability constraints

Mostafa Bakhtvar, Andrew Keane,
Journal Paper Power Systems, IEEE Transactions on published on 11/08/2015

Using Energy Storage to Manage High Net Load Variability at Sub-Hourly Time-Scales

Ciara O'Dwyer, Damian Flynn,
Journal Paper IEEE TRANSACTIONS ON POWER SYSTEMS published on 01/07/2015

Residential Load Modeling of Price Based Demand Response for Network Impact Studies

Killian McKenna, Andrew Keane,
Journal Paper IEEE Transactions on Smart Grid published on 10/06/2015

Visualizing the Electrical Structure of Power Systems

Paul Cuffe, Andrew Keane,
Journal Paper IEEE Systems Journal published on 15/05/2015

Peak load reductions: Electric load shifting with mechanical pre-cooling of residential buildings with low thermal mass

W.J.N. Turner; I.S. Walker; J. Roux,
Journal Paper Energy published on 26/02/2015

Experimental investigation into the thermal performance of a residential hybrid ventilation system

W.J.N. Turner; H. Awbi,
Journal Paper Applied Thermal Engineering published on 25/02/2015

An ontology to represent energy-related occupant behavior in buildings. Part I: Introduction to the DNAs framework

T. Hong; S. D'Oca; W.J.N. Turner; S.C. Taylor-Lange,
Journal Paper Building and Environment published on 25/02/2015

A simplified model for estimating population-scale energy impacts of building envelope air tightening and mechanical ventilation retrofits

J.M. Logue; W.J.N. Turner; I.S. Walker; B.C. Singer,
Journal Paper Journal of Building Performance Simulation published on 19/01/2015

Demand-side Characterization of the Smart City for Energy Modelling

W.J.N. Turner; O. Kinnane; B. Basu,
Journal Paper Energy Procedia published on 26/12/2014

Variable Frequency Operation for Future Offshore Wind Farm Design: A Comparison with Conventional Wind Turbines

R. Meere, J. Ruddy and T. O’Donnell ,
Journal Paper Elsevier Energy Procedia published on 01/10/2014

Using semantic web technologies to access soft AEC data

Edward Corry, James O’Donnell, Edward Curry, Daniel Coakley, Pieter Pauwels, Marcus Keane,
Journal Paper Advanced Engineering Informatics published on 11/08/2014

Residential hybrid ventilation: Airflow and heat transfer optimisation of a convector using computational fluid dynamics

W.J.N. Turner; H. Awbi,
Journal Paper Building Simulation published on 06/08/2014

Emissions from cycling of thermal power plants in electricity systems with high penetration of wind power: Life cycle assessment for Ireland

R. Turconi, C. O'Dwyer, D. Flynn, T. Astrup,
Journal Paper Applied Energy published on 27/06/2014

Distribution transformer loss-of-life cost allocation to network customers

Mohammad Mousavi, Ali ABBASI,
Journal Paper Turkish Journal of Electrical Engineering & Computer Sciences published on 01/04/2014

Optimal Load Management with inclusion of Electric Vehicles and Distributed Energy Resources

F. Milano and O. Hersent,
Journal Paper IEEE TRANSACTIONS ON SMART GRID published on 01/03/2014

Quantifying the Long-Term Impact of Electric Vehicles on the Generation Portfolio

Aonghus Shortt, Mark O'Malley,
Journal Paper IEEE Transactions on Smart Grid published on 04/11/2013

Risk-return incentives in liberalised electricity markets

Muireann Á. Lynch, Aonghus Shortt, Richard S.J. Tol, Mark J. O'Malley,
Journal Paper Energy Economics published on 08/09/2013

Rolling Multi-Period Optimisation to Control Electric Vehicle Charging in Distribution Networks

Alison O’Connell, Damian Flynn, Andrew Keane ,
Journal Paper IEEE Transactions on Power Systems published on 05/09/2013

Capability Chart for Distributed Reactive Power Resources

Paul Cuffe, Paul Smith, Andrew Keane,
Journal Paper IEEE Transactions on Power Systems published on 01/09/2013

Using a ventilation controller to optimise residential passive ventilation for energy and indoor air quality

W.J.N. Turner; I.S.Walker,
Journal Paper Building and Environment published on 27/08/2013

Energy Loss Reduction by Conductor Replacement and Capacitor Placement in Distribution Systems

Vahid Farahani, Hesamedin Sadeghi, Hossein Askarian Abyaneh, Mohammad Mousavi, Kazem Mazlumi,
Journal Paper IEEE TRANSACTIONS ON POWER SYSTEMS published on 01/08/2013

Identification of Critical Wind Farm Locations for Improved Stability and System Planning

Eknath Vittal, Andrew Keane,
Journal Paper IEEE Transactions on Power Systems published on 01/08/2013

Allocation of the Loss-of-life Cost of Inservice Distribution Cables to Network Customers

MOHAMMAD MOUSAVI, ALI ABBASI, HAMED HASHEMI, EHSAN AZAD ,
Journal Paper Electric Power Components and Systems published on 30/06/2013

A Systematic Method to Model Power Systems as Stochastic Differential Algebraic Equations

Federico Milano and Rafael Zarate-Minano,
Journal Paper Power Systems, IEEE Transactions published on 25/06/2013

Should unit commitment be endogenously included in wind power transmission planning optimisation models?

Daniel Burke, Aidan Tuohy, Jody Dillon, Mark O'Malley,
Journal Paper IET Renew. Power Gener., 2014, Vol. 8, Iss. 2 published on 09/05/2013

Analysis of the effect of distributed generation on life expectancy of power cables

Mohammad Mousavi, H. Askarian Abyaneh, P. Siano,
Journal Paper INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS published on 18/01/2013

Transmission Planning for Wind Energy in the United States and Europe: Status and Prospects

Charles Smith, Dale Osborn, Robert Zavadil, Warren Lasher, Emilio Gomez-Lazaro, Ana Estanqueiro, Thomas Trotscher, John Tande, Magnus Korpas, Frans Van Hulle, Hannele Holttinen, Antje Orths, Daniel Burke, Mark O’Malley, Jan Dobschinski, Barry Rawn, Madeline Gibescu, Lewis Dale,
Journal Paper WIREs Energy Environ 2013, 2: 1–13 published on 01/01/2013

Infiltration as ventilation: Weather-induced dilution

W.J.N. Turner; M.H. Sherman; I.S. Walker,
Journal Paper HVAC&R Research published on 14/11/2012

A combined energy and IAQ assessment of the potential value of commissioning residential mechanical ventilation systems

W.J.N. Turner; J.M. Logue; C.P. Wray,
Journal Paper Building and Environment published on 06/11/2012

Transmission System Impact of Wind Energy Harvesting Networks

Paul Cuffe, Paul Smith, Andrew Keane,
Journal Paper IEEE Transactions on Sustainable Energy published on 01/10/2012

Experience and Challenges With Short-Term Balancing in European Systems With Large Share of Wind Power

Lennart Söder, Senior Member, IEEE, Hans Abildgaard, Member, IEEE, Ana Estanqueiro, Member, IEEE, Camille Hamon, Student Member, IEEE, Hannele Holttinen, Eamonn Lannoye, Student Member, IEEE, Emilio Gómez-Lázaro, Senior Member, IEEE, Mark O’Malley, Fellow, IEEE, and Uwe Zimmermann,
Journal Paper IEEE Transactions on Sustainable Energy published on 01/10/2012

Methodologies to Determine Operating Reserves Due to Increased Wind Power

Hannele Holttinen, Member, IEEE, Michael Milligan, Senior Member, IEEE, Erik Ela, Member, IEEE, Nickie Menemenlis, Jan Dobschinski, Barry Rawn, Member, IEEE, Ricardo J. Bessa, Damian Flynn, Senior Member, IEEE, Emilio Gómez-Lázaro, Senior Member, IEEE, and Nina K. Detlefsen,
Journal Paper Sustainable Energy, IEEE Transactions on (Volume:3 , Issue: 4 ) published on 01/10/2012

Evaluation of Advanced Operation and Control of Distributed Wind Farms to Support Efficiency and Reliability

Andrew Keane, Member, IEEE, Paul Cuffe, Student Member, IEEE, Ellen Diskin, Daniel Brooks, Senior Member, IEEE, Paul Harrington, Tony Hearne, Matt Rylander, Member, IEEE, and Teresa Fallon,
Journal Paper Sustainable Energy, IEEE Transactions on (Volume:3, Issue: 4 ) published on 01/10/2012

Demand Side Management Potential of Domestic Water Heaters and Space Heaters

Qazi, Hassan Wajahat; Flynn, Damian,
Journal Paper Power Plants and Power Systems Control published on 02/09/2012

Accommodating Variability in Generation Planning

Aonghus Shortt, Juha Kiviluoma, Mark O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 10/07/2012

Local vs. centralised charging strategies for electric vehicles in low voltage distribution systems

Peter Richardson, Damian Flynn, Andrew Keane,
Journal Paper IEEE Transactions on Smart Grid published on 01/06/2012

Evaluation of Power System Flexibility

Eamonn Lannoye, Damian Flynn, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/05/2012

Studying the Variability and Uncertainty Impacts of Variable Generation at Multiple Timescales

Erik Ela, Member, IEEE, and Mark O’Malley, Fellow, IEEE,
Journal Paper Power Systems, IEEE Transactions on (Volume:27 , Issue: 3 ) published on 08/03/2012

Optimal charging of electric vehicles in low voltage distribution systems

Peter Richardson, Damian Flynn, Andrew Keane,
Journal Paper IEEE Transactions on Power Systems published on 01-02-2012

Multi-Mode Operation of Combined-Cycle Gas Turbines With Increasing Wind Penetration

Niamh Troy, Damian Flynn and Mark OMalley,
Journal Paper IEEE TRANSACTIONS ON POWER SYSTEMS published on 01/02/2012

Minimizing the Reactive Support for Distributed Generation: Enhanced Passive Operation and Smart Distribution Networks

Ochoa, L, Keane, A., Dent. C., Harrison, G,
Journal Paper IEEE Transactions on Power Systems (Volume 26, Issue 4) published on 01/11/2011

A Study of Principal Component Analysis Applied to Spatially Distributed Wind Power

Daniel Burke, Mark O'Malley,
Journal Paper IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 26, NO. 4, NOVEMBER 2011 published on 01/11/2011

Effect of Short-Term Risk-Aversive Dispatch on a Complex System Model for Power Systems

Ronan Fitzmaurice, Andrew Keane and Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems (Volume: 26, Issue: 1) published on 11/10/2011

Magnetic-Core and Air-Core Inductors on Silicon: A Performance Comparison up to 100 MHz

Ronan Meere, Ningning Wang, Terence O’Donnell, Santosh Kulkarni, SaibalRoy, S. Cian O’Mathuna,
Journal Paper IEEE TRANSACTIONS ON MAGNETICS published on 01/10/2011

Electricity Prices and Generator Behaviour in Gross Pool Electricity Markets

O’Mahoney, Amy and Denny, Eleanor,
Journal Paper Energy Policy (Volume: 63) published on 01/08/2011

Validation of Fixed Speed Induction Generator Models for Inertial Response Using Wind Farm Measurements

Jason M. Kennedy, Brendan Fox, Tim Littler, Damian Flynn,
Journal Paper IEEE Transactions on Power Systems published on 01/08/2011

Factors Influencing Wind Energy Curtailment

Daniel Burke, Mark O'Malley,
Journal Paper IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, VOL. 2, NO. 2, APRIL 2011 published on 01/04/2011

A Study of Optimal Non-Firm Wind Capacity Connection to Congested Transmission Systems

Daniel Burke, Mark O'Malley,
Journal Paper IEEE TRANSACTIONS ON SUSTAINABLE ENERGY, VOL. 2, NO. 2, APRIL 2011 published on 01/04/2011

Capacity Value of Wind Power, Calculation, and Data Requirements: the Irish Power System Case

Bernhard Hasche, Andrew Keane, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2011

Enhanced Utilisation of Voltage Control Resources with Distributed Generation

Andrew Keane, Luis F. Ochoa, Eknath Vittal, Chris J.Dent, Gareth P. Harrison,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2011

The Viability of Balancing Wind Generation with Large Scale Energy Storage

B. Nyamdash, Student Member IEEE, E. Denny, Member IEEE and M. O’Malley, Fellow IEE,
Journal Paper Energy Policy published on 01/11/2010

Capacity Value of Wind Power

Andrew Keane, Michael Milligan, Chris J. Dent, Bernhard Hasche, Claudine D’Annunzio, Ken Dragoon, Hannele Holttinen, Nader Samaan, Lennart Söder, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 22/07/2010

Decoupled-DFIG Fault Ride-Through Strategy for Enhanced Stability Performance During Grid Faults

Lasantha Gunaruwan Meegahapola, Student Member, IEEE, Tim Littler, and Damian Flynn, Member, IEEE,
Journal Paper Sustainable Energy, IEEE Transactions on published on 15/07/2010

Base-Load Cycling on a System with Significant Wind Penetration

Troy, N., Denny, E., O'Malley, M.J.,
Journal Paper IEEE Transactions on Power Systems published on 02/05/2010

’Maximizing Firm Wind Connection to Security Constrained Transmission Networks

Daniel Burke, Mark O'Malley,
Journal Paper IEEE Transactions on Power Systems, Vol.25, No.2, May 2010 published on 01/05/2010

A new method for transmission loss allocation considering the circulating currents between generators

Sobhy Mohamed Abdelkader and Damian Flynn,
Journal Paper European Transactions on Electrical Power published on 22/04/2010

Coordinated utilisation of wind farm reactive power capability for system loss optimisation

L. Meegahapola, S. Durairaj, D. Flynn, B. Fox,
Journal Paper European Transactions on Electrical Power published on 02/03/2010

An Assessment of the Impact of Wind Generation on System Frequency Control

Ronan Doherty, Alan Mullane, Gill Nolan, Daniel Burke, Alex Bryson, Mark O’Malley ,
Journal Paper IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 25, NO. 1, 2010 published on 01/02/2010

An Assessment of the Impact of Wind Generation on System Frequency Control

Ronan Doherty, Alan Mullane, Gillian (Lalor) Nolan, Daniel J. Burke, Alexander Bryson, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2010

A Steady-State Voltage Stability Analysis of Power Systems with High Penetrations of Wind

Eknath Vittal, Mark O’Malley and Andrew Keane,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2010

Graphical Determination of Network Limits for Wind Power Integration

S.M. Abdelkader, D. Flynn,
Journal Paper IET Generation, Transmission & Distribution published on 01/09/2009

Burning peat in Ireland: An electricity market dispatch perspective

Aidan Tuohy, Morgan Bazilian, Ronan Doherty, Brian O´ Gallachoir, Mark O’Malley,
Journal Paper Energy Policy published on 01/08/2009

Optimal Utilization of Distribution Networks for Energy Harvesting

Andrew Keane and Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2007

Establishing the Role that Wind Generation may have in Furture Generation Portfolios

Ronan Doherty, Hugh Outhred, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/08/2006

Wind Generation, Power System Operation and Emissions Reduction

Eleanor Denny, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2006

Frequency Control and Wind Turbine Technologies

Gillian Lalor, Alan Mullane, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/11/2005

Impact of tidal generation on power system operation in Ireland

A. Garth Bryans, Brendan Fox, Peter A. Crossley, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/11/2005

Frequency Control in Competitive Electricity Market Dispatch

Ronan Doherty, Gillian Lalor, Mark O’Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/08/2005

Wind Penetration Studies on the Island of Ireland

Ronan Doherty, Leslie Bryans, Paul Gardner and Mark O’Malley,
Journal Paper WIND ENGINEERING published on 27/04/2004

Challenges of Increased Wind Energy Penetration in Ireland

Morgan Bazilian, Eleanor Denny, Mark O’Malley,
Journal Paper Wind Engineering Journal published on 01/01/2004

Initialisation of the augmented Hopfield network for improved generator scheduling

J.D. Dillon, M.P. Walsh and M.J. O'Malley,
Journal Paper IEE Proc.- Gener. Transm. Distrib. published on 01/09/2002

A Lagrangian augmented Hopeld networkfor mixed integer non-linear programming problems

Joseph D. Dillon and Mark J. O’Malley,
Journal Paper Neurocomputing published on 01/01/2002

Frequency response of power systems with variable speed wind turbines

Lisa Ruttledge, Nicholas W. Miller, Jonathan O'Sullivan, Damian Flynn,
Journal Paper IEEE Transacions on Sustainable Energy published on 01/10/12

Reliability and Reserve in Competitive Electricity Market Scheduling

Meadhbh Flynn, Student Member, IEEE, W. Paul Sheridan, Student Member, IEEE, Joseph D. Dillon, and Mark J. O’Malley, Senior Member, IEEE,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2001

Efficient Use of Generator Resources in Emerging Electricity Markets

M.E. Flynn, M.P. Walsh and M.J. O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/02/2000

Augmented Hopfield Network for Constrained Generator Scheduling

M.P. Walsh and M.J. O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/05/1999

A New Methodology for the Provision of Reserve in an Isolated Power System

JW O'Sullivan and MJ O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/05/1999

Augmented Hopfield Network for Mixed-Integer Programming

Michael P. Walsh, Meadhbh E. Flynn, and Mark J. O’Malley,
Journal Paper IEEE Transactions on Neural Networks published on 01/03/1999

A Drum Boiler Model for Long Term Power System Dynamic Simulation

M.E. Flynn and M.J. O'Malley,
Journal Paper IEEE Transactions on Power Systems, Vol. 14, No. 1 published on 01/02/1999

Augmented Hopfield Network for Unit Commitment and Economic Dispatch

M.P. Walsh and M.J. O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/11/1997

Economic Dispatch of a Small Utility with a Frequency Based Reserve Policy

JW O'Sullivan and MJ O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/08/1996

Identification and Validation Dynamic Global Load Model Parameters for Use in Power System Frequency Simulations

JW O'Sullivan and MJ O'Malley,
Journal Paper IEEE Transactions on Power Systems published on 01/05/1996

Rotor Angle Stability with High Penetrations of Wind Generation

Vittal, Eknath; O'Malley, Mark; Keane, Andrew,
Journal Paper IEEE Transactions on Power Systems2011 published on

Competition and the Single Electricity Market: Which Lessons for Ireland

Valeria di Cosmo, Muireann Á. Lynch,
Journal Paper published on

Estimating the Impact of Time-of-Use Pricing on Irish Electricity Demand

Valeria Di Cosmo, Sean Lyons, Anne Nolan,
Journal Paper Energy Journal published on

Stochastic Optimization Model to Study the Operational Impacts of High Wind Penetrations in Ireland

Peter Meibom, Member, IEEE, Rüdiger Barth, Bernhard Hasche, Heike Brand, Christoph Weber, Member, IEEE, and Mark O’Malley, Fellow, IEEE,
Journal Paper Power Systems, IEEE Transactions on (Volume:26 , Issue: 3 ) Aug. 2011 published on

Assortativity Anomalies in a Large Test System

Paul Cuffe,
Journal Paper IEEE Transactions on Power Systems published on

Short-Term Energy Balancing With Increasing Levels of Wind Energy

Juha Kiviluoma, Peter Meibom, Aidan Tuohy, Niamh Troy, Michael Milligan, Senior Member, IEEE, Bernhard Lange, Madeleine Gibescu, and Mark O’Malley, Fellow, IEEE,
Journal Paper Sustainable Energy, IEEE Transactions on (Volume:3 , Issue: 4 ) Oct. 2012 published on

Energy implications of in-line filtration in California homes

I.S. Walker; D. Dickerhoff; D. Faulkner; W.J.N. Turner,
Journal Paper ASHRAE Transactions published on

The efficiency of Ireland’s Renewable Energy Feed-In Tariff (REFIT) for wind generation

Doherty, Ronan; O'Malley, Mark,
Journal Paper Energy Policy (Volume: 39, Issue: 9)Sep. 2011 published on

Pumped storage in systems with very high wind penetration

A. Tuohy, M. O’Malley,
Journal Paper Energy Policy (Volume 39, Issue 4)April 2011 published on

Generalized Model of VSC-based Energy Storage Systems for Transient Stability Analysis

Álvaro Ortega, Federico Milano,
Journal Paper IEEE Transactions on Power Systems published on