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Subject = Power Quality;
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Displaying Results 1 - 25 of 27 on page 1 of 2
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A Review of Parallel Operation of Active Power Filters in the Distributed Generation System
(2011)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
A Review of Parallel Operation of Active Power Filters in the Distributed Generation System
(2011)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
Abstract:
In this paper a technical review of parallel operation of Active Power Filter (APF) for harmonic power compensation in distributed generation (DG) network has been presented. Controlling methods and connection topologies with their pros and cons are described. Recent improvements in controlling and future trends for the application of APFs in distributed mode are also identified.
https://arrow.dit.ie/engscheleart/168
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An analysis of the potential benefits of centralised predictive control for optimal electrical power generation from wave energy arrays
(2018)
O'Sullivan, Adrian C. M.; Sheng, Wanan; Lightbody, Gordon
An analysis of the potential benefits of centralised predictive control for optimal electrical power generation from wave energy arrays
(2018)
O'Sullivan, Adrian C. M.; Sheng, Wanan; Lightbody, Gordon
Abstract:
This work focuses on an array of point absorbers, with linear permanent magnet generators (LPMG) connected to the grid via back to back voltage source converters, controlled using economic model predictive control (MPC) that produces optimal electrical power generation. The main contribution of this paper is the comparison of the performance provided by using either a centralised or decentralised MPC scheme. In this study, it is shown how the inclusion of viscosity and system constraints limits the benefits to be obtained by the use of a centralised control scheme. Indeed, it was shown that a decentralised MPC scheme was sufficient for the provision of close to optimum electrical power extraction from the array when there was a reasonable separation between WEC devices. It was shown that the introduction of power constraints, either locally at each device or globally for the entire array, improved the quality of the power exported to the grid. Importantly, it was shown that from the...
http://hdl.handle.net/10468/6155
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ANALYSIS OF A VARIABLE SPEED DOUBLE-FED INDUCTION GENERATOR WIND TURBINE DURING NETWORK VOLTAGE UNBALANCE CONDITIONS.
(2007)
Kearney, Joseph; Conlon, Michael
ANALYSIS OF A VARIABLE SPEED DOUBLE-FED INDUCTION GENERATOR WIND TURBINE DURING NETWORK VOLTAGE UNBALANCE CONDITIONS.
(2007)
Kearney, Joseph; Conlon, Michael
Abstract:
The behaviour of Double-Fed Induction Generators to supply network voltage unbalance is investigated. The paper shows the effects that voltage unbalance can have on a DFIG, using Matlab/Simulink. The results from simulations show that voltage unbalance affects both the induction generator and the rotor converter, due to the high unbalanced currents generated. The ability to modify the control strategy of a DFIG to compensate for voltage unbalance is outlined and simulations show the improvements to the performance of the DFIG.
https://arrow.dit.ie/engscheleart/219
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Analysis of Compensation Techniques Applied to the Control of Converter Connected Synchronous Wind Turbines and DFIG’s During Grid Disturbances.
(2012)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Analysis of Compensation Techniques Applied to the Control of Converter Connected Synchronous Wind Turbines and DFIG’s During Grid Disturbances.
(2012)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
This paper investigates control schemes to improve the performance of converter connected synchronous generators and DFIG’s to grid voltage unbalance and grid faults. Both the synchronous generator with a full converter and a DFIG are modelled in Matlab/Simulink. The control schemes of both turbines are modified to improve their performance during grid disturbances including grid voltage unbalance and single-phase faults. These disturbances are introduced into the models at specific times to analyse the performance of the wind generation systems. The performances of both systems to the grid disturbances are compared and the results are analysed.
https://arrow.dit.ie/engscheleart/226
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Analysis of Converter Connected Synchronous Wind Turbines to Grid Disturbances.
(2011)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Analysis of Converter Connected Synchronous Wind Turbines to Grid Disturbances.
(2011)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
This paper investigates the performance of synchronous generators to grid voltage unbalance and grid faults. A Model of a synchronous generator with a full converter is implemented in the SimPowerSystems toolbox in Matlab/Simulink. Methods to modify the converter control schemes to improve the synchronous generator systems response to grid voltage unbalance and grid faults are investigated. Grid faults including grid voltage unbalance, and line-to-ground faults are introduced into the model at specific times to analyse the performance of the wind generation system. Improvements in the performance of the synchronous generator WECS to the grid disturbances are illustrated.
https://arrow.dit.ie/engscheleart/225
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Application of wavelet transform to power quality (PQ) disturbance analysis
(2004)
Basu, Malabika; Basu, Biswajit
Application of wavelet transform to power quality (PQ) disturbance analysis
(2004)
Basu, Malabika; Basu, Biswajit
Abstract:
This paper presents a wavelet analysis based time-frequency technique to identify power system transients and disturbances. A mother wavelet basis function (Littlewood- Paley (L-P)) with dyadic non-overlapping frequency hands has been used. The advantage of the proposed approach is in identification of the occurrence and duration of the disturbances. A few power signals with power quality disturbances have been analysed to show the effectiveness of the proposed technique.
https://arrow.dit.ie/engscheleart/110
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Applying international power quality standards for current harmonic distortion to wave energy converters and verified device emulators
(2019)
Kelly, James; Aldaiturriaga, Endika; Ruiz-Minguela, Pablo
Applying international power quality standards for current harmonic distortion to wave energy converters and verified device emulators
(2019)
Kelly, James; Aldaiturriaga, Endika; Ruiz-Minguela, Pablo
Abstract:
The push for carbon-free energy sources has helped encourage the development of the ocean renewable energy sector. As ocean renewable energy approaches commercial maturity, the industry must be able to prove it can provide clean electrical power of good quality for consumers. As part of the EU funded Open Sea Operating Experience to Reduce Wave Energy Cost (OPERA) project that is tasked with developing the wave energy sector, the International Electrotechnical Commission (IEC) developed electrical power quality standards for marine energy converters, which were applied to an oscillating water column (OWC). This was done both in the laboratory and in the real world. Precise electrical monitoring equipment was installed in the Mutriku Wave Power Plant in Spain and to an OWC emulator in the Lir National Ocean Test Facility at University College Cork in Ireland to monitor the electrical power of both. The electrical power generated was analysed for harmonic current distortion and the re...
http://hdl.handle.net/10468/8830
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Capacity enhancement and flexible operation of unified power quality conditioner in smart and microgrid network
(2018)
Khadem, Shafiuzzaman K.; Basu, Malabika; Conlon, Michael F.
Capacity enhancement and flexible operation of unified power quality conditioner in smart and microgrid network
(2018)
Khadem, Shafiuzzaman K.; Basu, Malabika; Conlon, Michael F.
Abstract:
This paper presents a new approach to design Unified Power Quality Conditioner (UPQC), termed as distributed UPQC (D-UPQC), for smart or microgrid network where capacity enhancement and flexible operation of UPQC are the important issues. This paper shows the possibility of capacity enhancement and operational flexibility of UPQC through a coordinated control of existing resources. This UPQC consists of a single unit series active power filter (APFse) and multiple shunt APF (APFsh) units in a distributed (parallel) mode. These units can be connected with a common/separate dc linked capacitor(s). The requirement of capacity enhancement arises from the flexibility to cope up with the increased harmonic load demand at low voltage (LV) distribution network. This can be accomplished by a coordinated control where multiple APFsh units are operated by utilizing the capacity of APFse while it is in idle/low mode using. Operational flexibility can be accomplished by compensating (i) the reac...
http://hdl.handle.net/10468/5507
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Electrical power optimisation of grid-connected wave energy converters using economic predictive control
(2018)
O'Sullivan, Adrian C. M.
Electrical power optimisation of grid-connected wave energy converters using economic predictive control
(2018)
O'Sullivan, Adrian C. M.
Abstract:
This thesis investigates the advanced control algorithms used for optimally extracting energy from a wave-to-wire wave energy converter system. The research focuses on the wave-to-wire system model as a whole, instead of its separate subsystems. This allows maximum exportation of average electrical power onto the grid from a wave energy array, with minimum mechanical and electrical constraint infringement and acceptable power quality. An economic model predictive control algorithm is first described for a wave-to-DClink system with a single wave energy converter connected to a simulated linear generator. This work investigates the importance of including the linear generator’s resistive losses in the cost function. Linear mechanical and non-linear electrical constraints are introduced into the model predictive control algorithm, where the effects on the average electrical power harvest are presented. A model predictive control algorithm with a field weakening enabled cost function i...
http://hdl.handle.net/10468/5840
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Grid integration of wave energy & generic modelling of ocean devices for power system studies
(2013)
Blavette, Anne
Grid integration of wave energy & generic modelling of ocean devices for power system studies
(2013)
Blavette, Anne
Abstract:
The work presented in this thesis covers four major topics of research related to the grid integration of wave energy. More specifically, the grid impact of a wave farm on the power quality of its local network is investigated. Two estimation methods were developed regarding the flicker level Pst generated by a wave farm in relation to its rated power as well as in relation to the impedance angle ψk of the node in the grid to which it is connected. The electrical design of a typical wave farm design is also studied in terms of minimum rating for three types of costly pieces of equipment, namely the VAr compensator, the submarine cables and the overhead line. The power losses dissipated within the farm's electrical network are also evaluated. The feasibility of transforming a test site into a commercial site of greater rated power is investigated from the perspective of power quality and of cables and overhead line thermal loading. Finally, the generic modelling of ocean devices...
http://hdl.handle.net/10468/1129
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Integration of UPQC for Power Quality Improvement in Distributed Generation Network – A Review
(2011)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
Integration of UPQC for Power Quality Improvement in Distributed Generation Network – A Review
(2011)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
Abstract:
In this paper a technical review of the integration of a Unified Power Quality Conditioner (UPQC) in a distributed generation network is presented. Although the primary task of UPQC is to minimize grid voltage and load current disturbances along with reactive and harmonic power compensation, additional functionalities such as compensation of voltage interruption and active power transfer to the load and grid have also been identified. Connection methodologies with their advantages and disadvantages are also described. Recent improvements in capacity expansion techniques and future trends for the application of UPQC in distributed modes are also identified.
https://arrow.dit.ie/eprccon/1
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Offshore Electrical Networks and Grid Integration of Wave Energy Converter Arrays - Techno-economic Optimisation of Array Electrical Networks, Power Quality Assessment, and Irish Market Perspectives
(2015)
Sharkey, Fergus
Offshore Electrical Networks and Grid Integration of Wave Energy Converter Arrays - Techno-economic Optimisation of Array Electrical Networks, Power Quality Assessment, and Irish Market Perspectives
(2015)
Sharkey, Fergus
Abstract:
Wave energy is an emerging industry and faces many challenges before commercial wave energy converter (WEC) arrays are installed. One of these challenges is the grid integration of WEC arrays. This includes offshore electrical networks, grid compliance, and access to electrical markets. This must be achieved in a technically viable manner and also at an acceptable cost. As electrical networks are expected to make up a large proportion of the overall WEC array CAPEX, perhaps up to 25%, this area is critical to the long term competitiveness of wave energy. The objectives of this thesis are to develop technically and economically acceptable electrical network designs for WEC arrays, evaluate voltage flicker issues for WEC arrays and develop design tools to analyse same, and evaluate the market scale for wave energy in Ireland, considering electrical integration issues in both the domestic and export markets. This thesis presents the optimum design for WEC array electrical networks. By ...
https://arrow.dit.ie/engdoc/75
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PERFORMANCE OF A VARIABLE SPEED DOUBLE-FED INDUCTION GENERATOR WIND TURBINE DURING NETWORK VOLTAGE UNBALANCE CONDITIONS
(2006)
Kearney, Joseph; Conlon, Michael
PERFORMANCE OF A VARIABLE SPEED DOUBLE-FED INDUCTION GENERATOR WIND TURBINE DURING NETWORK VOLTAGE UNBALANCE CONDITIONS
(2006)
Kearney, Joseph; Conlon, Michael
Abstract:
The issues of the negative performance of DFIG’s due to supply network voltage unbalance are outlined in this paper. The paper shows the effects that voltage unbalance can have on a DFIG, using the power simulation program DigSilent. The results from simulations show that voltage unbalance affects the both the induction generator and the rotor converter, due to the high unbalanced currents generated. The ability to modify the control strategy of a DFIG to compensate for voltage unbalance is outlined and a proposal to build a test-rig suitable to implement such a system is suggested.
https://arrow.dit.ie/engscheleart/218
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Power Quality Improvement in Fuel Cell Based Hybrid Power System using STATCOM
(2016)
Patra, Sandipan
Power Quality Improvement in Fuel Cell Based Hybrid Power System using STATCOM
(2016)
Patra, Sandipan
Abstract:
This paper presents the power quality improvement in a microgrid, supplying a nonlinear and unbalanced load using fuzzy logic controller based static synchronous compensator (STATCOM). The microgrid contains a hybrid combination photovoltaic (PV), fuel cell (FC) along with the battery energy storage system (BESS) where a decentralized power sharing algorithm is used to control its power management. Here, STATCOM is used as a compensator for the hybrid system to reduce the harmonics in the voltage and current profile at the point of common coupling (PCC). The current reference is generated taking into account, the active and reactive power to be supplied by the micro-source which is connected to the compensator. Depending on the power requirement of the nonlinear load, the proposed control scheme can change modes of operation without any external communication interfaces. The proposed control scheme can even compensate system unbalance caused by the single-phase micro sources and loa...
https://arrow.dit.ie/sjer/vol1/iss1/1
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Power Quality in Grid Connected Renewable Energy Systems: Role of Custom Power Devices
(2010)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
Power Quality in Grid Connected Renewable Energy Systems: Role of Custom Power Devices
(2010)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
Abstract:
This paper deals with the technical review of power quality problems associated with the renewable based distributed generation systems and how the custom power devices like STATCOM, DVR and UPQC play important role in power quality improvement. IEEE and IEC standard for the grid connected renewable energy systems are one of the critical point of interest for the selection of custom power devices. Special attention has been given on the compensation of reactive power, harmonic current and voltage fluctuation during the interconnected as well as islanding mode of operation. As the solar and wind are the most abundant resources therefore our point of interest are limited to PV and Wind energy systems only.
https://arrow.dit.ie/engscheleart/144
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Protection of DVR against short circuit faults at the load side
(2006)
Axente, Iurie; Basu, Malabika; Conlon, Michael; Gaughan, Kevin
Protection of DVR against short circuit faults at the load side
(2006)
Axente, Iurie; Basu, Malabika; Conlon, Michael; Gaughan, Kevin
Abstract:
An additional control scheme has been proposed in this paper for a dynamic voltage restorer (DVR), to protect it against load short circuit conditions. When overcurrents occur in the distribution system, under the proposed scheme the DVR reverses its injected voltage polarity so as to minimise the current flow. The detection method is based on impedance measurement feedback. The advantage of the scheme is that no additional over current device or protection is required for the DVR and it is easy to implement. The proposed control scheme has been validated through simulation.
https://arrow.dit.ie/engscheleart/93
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Rating requirements of a unified power quality conditioner (UPQC) for voltage ride through capability enhancement
(2006)
Jayanti, N. G.; Basu, Malabika; Conlon, Michael; Gaughan, Kevin
Rating requirements of a unified power quality conditioner (UPQC) for voltage ride through capability enhancement
(2006)
Jayanti, N. G.; Basu, Malabika; Conlon, Michael; Gaughan, Kevin
Abstract:
The problem of voltage ride through capability of fixed speed wind generation as a result of voltage sags is examined by means of a simulation study. The role of a Unified Power Quality Conditioner (UPQC), which provides both shunt and series compensation, in enhancing the ride through capability is investigated under both full and partial voltage restoration. Results of a study to identify the minimum rating requirements to ensure stability are presented.
https://arrow.dit.ie/engscheleart/94
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Resource-induced voltage flicker for wave energy converters – assessment tools
(2013)
Sharkey, Fergus; MacEnri, Joe; Bannon, Elva; Conlon, Michael; Gaughan, Kevin
Resource-induced voltage flicker for wave energy converters – assessment tools
(2013)
Sharkey, Fergus; MacEnri, Joe; Bannon, Elva; Conlon, Michael; Gaughan, Kevin
Abstract:
For wave energy converters, the input resource has a typical period of 5–20 s depending on the site location and dominant seastates. Wave energy converters generally produce mechanical power twice per wave cycle and therefore depending on the storage available, the electrical power output has half the period of the input resource. These regular power changes induce a voltage change at the point of connection (POC) which is proportional to the amplitude of the power change and at the same frequency. Therefore the coupling of the input resource to the output power of a wave energy converter will cause voltage flicker at the POC, which may exceed the permitted limits under specific conditions. This study establishes the nature of the flicker issue from wave energy converters. Some practical tools for the evaluation of flicker from a device are introduced. These tools are suitable for early stage flicker assessment to assist in the design process only. They are not meant of substitutes ...
https://arrow.dit.ie/engscheleart2/74
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The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance.
https://arrow.dit.ie/engscheleart/224
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The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Application of Multi Frequency Resonant Controllers in in a DFIG to Improve Performance by Reducing Unwanted Power and Torque Pulsations and Reducing Current Harmonics.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
The paper describes a method to control the rotor-side and grid side converters in a DFIG when subjected to the effects of network voltage unbalance conditions. Multi Frequency Resonant Controllers are incorporated into the grid side and rotor side converters to assist in the control functions. The Resonant Controllers are tuned to twice the network frequency to assist in the control of power and torque pulsations and to three times the network frequency to assist in the control of the generated third harmonic currents. A DFIG model is implemented in Matlab/Simulink and simulations show the reduction in power and torque oscillations and a reduction in the 3rd harmonic currents generated as a result of the applied voltage unbalance.
https://arrow.dit.ie/engscheleart/222
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The Control of Rotor Side and Grid Side Converters in a DFIG During Network Voltage Unbalance Conditions Using Resonant Current Controllers.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Control of Rotor Side and Grid Side Converters in a DFIG During Network Voltage Unbalance Conditions Using Resonant Current Controllers.
(2010)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
Abstract:
This paper implements control techniques to enable improved operation of DFIG’s when subjected to the effects of network voltage unbalance conditions. The control scheme involves the integration of a resonant regulator into the PI controllers of both the rotor side and grid side converters in a DFIG. The resonant controller is tuned to twice the network frequency (2ωe) and designed to mitigate against the oscillations in a DFIG due to network voltage unbalance conditions. The grid side converter controller also incorporates a second resonant controller tuned to three times the grid frequency (3ωe) to alleviate the amplitude of the generated third harmonic currents. The control schemes of both the rotor side and grid side converters are coordinated to enable concurrently reductions in both the torque pulsations and the total DFIG power oscillations. A DFIG model is implemented in the program Matlab/Simulink and simulations show the reduction in power and torque oscillations and a red...
https://arrow.dit.ie/engscheleart/223
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The Effects of Harmonics on Power Quality and Energy Efficiency
(2010)
Harrison, Alan
The Effects of Harmonics on Power Quality and Energy Efficiency
(2010)
Harrison, Alan
Abstract:
By making our electricity supply more secure, reliable and versatile will mean that we reduce our reliance upon oil, gas and solid fuels, which mostly exist outside of Ireland and the European community. The majority of our fuel is imported and this makes our economy dependent on outside interests and out of our control. Even more importantly as the world’s fossil fuel reserves are running out and electricity demand is ever increasing. If we make our electricity networks secure and designed to the highest standards we can import and export electrical energy more easily as our demands change, for example by exporting to other European countries any surplus energy from wind farms or wave energy. This is achieved by paralleling all our power stations and micro generating plants, which consist of combined heat and power plants, wind turbines, hydro power, wave power and photovoltaic installations. These plants that are connected to the distribution system must be reliable and produce po...
https://arrow.dit.ie/engschelecon/5
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The Integrated Control of the Rotor Side and Grid Side Converters in a DFIG to Reduce Both Power and Torque Pulsations During Network Voltage Unbalance Conditions.
(2009)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
The Integrated Control of the Rotor Side and Grid Side Converters in a DFIG to Reduce Both Power and Torque Pulsations During Network Voltage Unbalance Conditions.
(2009)
Kearney, Joseph; Conlon, Michael; Coyle, Eugene
https://arrow.dit.ie/engscheleart/221
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The Role of Micro Wind Generation in Ireland’s Energy Future
(2008)
Sunderland, Keith; Conlon, Michael
The Role of Micro Wind Generation in Ireland’s Energy Future
(2008)
Sunderland, Keith; Conlon, Michael
Abstract:
This paper defines the current position for micro-generation, with particular reference to the potential for micro-wind units, in the Irish electricity supply system. A network model is developed using the Distflow method of load flow analysis and is applied to consider the appropriate level of micro-generation penetration.
https://arrow.dit.ie/engscheleart/173
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UPQC for Power Quality Improvement in DG Integrated Smart Grid Network: a Review
(2012)
Khadem, Shafiuzzaman; Basu, Malabika; Conlon, Michael
UPQC for Power Quality Improvement in DG Integrated Smart Grid Network: a Review
(2012)
Khadem, Shafiuzzaman; Basu, Malabika; Conlon, Michael
Abstract:
Quality of power supply has become an important issue with the increasing demand of Distributed Generation (DG) systems either connected to the grid through some power electronics grid-tie inverters or to work in isolated (microgrid) mode towards the development of a smart grid network. In this paper a technical review of Integration of Unified Power Quality Conditioner (UPQC) in Distributed Generation Network has been presented. Though the primary task of UPQC is to minimize the grid voltage and load current disturbance along with the reactive and harmonic power compensation, additional functionalities like compensation of voltage interruption and active power transfer to the load and grid have also been identified. Connection methodologies with their pros and cons are also described. Recent improvements in capacity expansion techniques and future trends for the application of UPQC to cope up with the expanding DG capacity are also reviewed.
https://arrow.dit.ie/engscheleart2/82
Displaying Results 1 - 25 of 27 on page 1 of 2
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