The Experts below are selected from a list of 5502 Experts worldwide ranked by ideXlab platform
Peter Crossley - One of the best experts on this subject based on the ideXlab platform.
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UK scenario of Islanded Operation of active distribution networks with renewable distributed generators
International Journal of Electrical Power & Energy Systems, 2011Co-Authors: S.p. Chowdhury, Peter CrossleyAbstract:Abstract This paper reports on the current UK scenario of Islanded Operation of active distribution networks with renewable distributed generators (RDGs). Different surveys indicate that the present scenario does not economically justify islanding Operation of active distribution networks with RDGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional Operational requirement of utilities. Technical studies clearly indicate the need to review parts of the Electricity Safety, Quality and Continuity Regulations (ESQCR) for successful Islanded Operations. Commercial viability of islanding Operation must be assessed in relation to enhancement of power quality, system reliability and supply of potential ancillary services through network support. Demonstration projects under Registered Power Zone and Technical Architecture Projects should be initiated to investigate the utility of DG islanding. However these efforts should be compounded with a realistic judgement of the associated technical and economic issues for the development of future power networks beyond 2010.
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Transient responses of distributed generators in Islanded Operation
2009 International Conference on Sustainable Power Generation and Supply, 2009Co-Authors: S. Hirodontis, Peter CrossleyAbstract:This paper assesses the transient Operation of a 33 kV distribution network in Islanded Operation consisting of different type and size of loads and distributed (mainly renewable) generators. The generators considered include synchronous generator representing the combined heat and power unit, fixed speed induction generator, doubly fed induction generator and power electronic connected photovoltaic units. This paper discusses briefly the network components and individual generator modeling. The implementation of the model and the investigation of the transient responses of the distributed generation units are demonstrated through simulation using the power system analysis package PSCAD.
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RETRACTED: UK scenario of Islanded Operation of active distribution networks with renewable distributed generators
Renewable Energy, 2009Co-Authors: Peter Crossley, S.p. Chowdhury, C.t. GauntAbstract:This paper reports on the current UK scenario of Islanded Operation of active distribution networks with renewable distributed generators (RDGs). Different surveys indicate that the present scenario does not economically justify islanding Operation of active distribution networks with RDGs. Anti-islanding protection schemes currently enforce the renewable distributed generators (RDGs) to disconnect immediately and stop generation for grid faults through loss of grid (LOG) protection system. This greatly reduces the benefits of RDG deployment. With rising RDG penetration, much benefit would be lost if the RDGs are not allowed to island only due to conventional Operational requirement of utilities. For preventing disconnection of RDGs during LOG, several islanding Operation, control and protection schemes are being developed. Technical studies clearly indicate the need to review parts of the ESQCR (Electricity Safety, Quality and Continuity Regulations) for successful Islanded Operations. Commercial viability of islanding Operation must be assessed in relation to enhancement of power quality, system reliability and supply of potential ancillary services through network support. Demonstration projects under Registered Power Zone and Technical Architecture Projects should be initiated to investigate the usefulness of DG islanding. However these efforts should be compounded with a realistic judgement of the associated technical and economic issues for the development of future power networks.
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Universal application of synchronous Islanded Operation
CIRED Seminar 2008: SmartGrids for Distribution, 2008Co-Authors: Robert Best, John D. Morrow, David Laverty, Peter CrossleyAbstract:Synchronous Islanded Operation keeps an Islanded system in synchronism with the main power system while not being electrically connected. The challenges associated with the multiple-set application are considered in this paper.
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UK scenario of Islanded Operation of active distribution networks — A survey
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008Co-Authors: Peter Crossley, S.p. Chowdhury, Chui Fen TenAbstract:This paper reports on the current UK scenario of Islanded Operation of active distribution networks with distributed generators (DGs). Different surveys indicate that the present scenario does not economically justify islanding Operation of active distribution networks with DGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional Operational requirement of utilities. Technical studies clearly indicate the need to review parts of the electricity safety, quality and continuity regulations (ESQCR) for successful Islanded Operations. Commercial viability of islanding Operation must be assessed in relation to enhancement of power quality, system reliability and supply of potential ancillary services through network support. Demonstration projects under registered power zone and technical architecture projects should be initiated to investigate the utility of DG islanding. However these efforts should be compounded with a realistic judgement of the associated technical and economic issues for the development of future power networks beyond 2010.
S.p. Chowdhury - One of the best experts on this subject based on the ideXlab platform.
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UK scenario of Islanded Operation of active distribution networks with renewable distributed generators
International Journal of Electrical Power & Energy Systems, 2011Co-Authors: S.p. Chowdhury, Peter CrossleyAbstract:Abstract This paper reports on the current UK scenario of Islanded Operation of active distribution networks with renewable distributed generators (RDGs). Different surveys indicate that the present scenario does not economically justify islanding Operation of active distribution networks with RDGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional Operational requirement of utilities. Technical studies clearly indicate the need to review parts of the Electricity Safety, Quality and Continuity Regulations (ESQCR) for successful Islanded Operations. Commercial viability of islanding Operation must be assessed in relation to enhancement of power quality, system reliability and supply of potential ancillary services through network support. Demonstration projects under Registered Power Zone and Technical Architecture Projects should be initiated to investigate the utility of DG islanding. However these efforts should be compounded with a realistic judgement of the associated technical and economic issues for the development of future power networks beyond 2010.
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RETRACTED: UK scenario of Islanded Operation of active distribution networks with renewable distributed generators
Renewable Energy, 2009Co-Authors: Peter Crossley, S.p. Chowdhury, C.t. GauntAbstract:This paper reports on the current UK scenario of Islanded Operation of active distribution networks with renewable distributed generators (RDGs). Different surveys indicate that the present scenario does not economically justify islanding Operation of active distribution networks with RDGs. Anti-islanding protection schemes currently enforce the renewable distributed generators (RDGs) to disconnect immediately and stop generation for grid faults through loss of grid (LOG) protection system. This greatly reduces the benefits of RDG deployment. With rising RDG penetration, much benefit would be lost if the RDGs are not allowed to island only due to conventional Operational requirement of utilities. For preventing disconnection of RDGs during LOG, several islanding Operation, control and protection schemes are being developed. Technical studies clearly indicate the need to review parts of the ESQCR (Electricity Safety, Quality and Continuity Regulations) for successful Islanded Operations. Commercial viability of islanding Operation must be assessed in relation to enhancement of power quality, system reliability and supply of potential ancillary services through network support. Demonstration projects under Registered Power Zone and Technical Architecture Projects should be initiated to investigate the usefulness of DG islanding. However these efforts should be compounded with a realistic judgement of the associated technical and economic issues for the development of future power networks.
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UK scenario of Islanded Operation of active distribution networks — A survey
2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008Co-Authors: Peter Crossley, S.p. Chowdhury, Chui Fen TenAbstract:This paper reports on the current UK scenario of Islanded Operation of active distribution networks with distributed generators (DGs). Different surveys indicate that the present scenario does not economically justify islanding Operation of active distribution networks with DGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional Operational requirement of utilities. Technical studies clearly indicate the need to review parts of the electricity safety, quality and continuity regulations (ESQCR) for successful Islanded Operations. Commercial viability of islanding Operation must be assessed in relation to enhancement of power quality, system reliability and supply of potential ancillary services through network support. Demonstration projects under registered power zone and technical architecture projects should be initiated to investigate the utility of DG islanding. However these efforts should be compounded with a realistic judgement of the associated technical and economic issues for the development of future power networks beyond 2010.
P A Crossley - One of the best experts on this subject based on the ideXlab platform.
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transient stability of a distribution subsystem during fault initiated switching to Islanded Operation
International Journal of Electrical Power & Energy Systems, 2018Co-Authors: Wei Zheng, P A CrossleyAbstract:Abstract This paper investigates the transient stability of a load-rich distribution subsystem during the switching process to Islanded mode instigated by a permanent fault. When operating in Islanded mode, the subsystem must maintain a generation-load power balance and use at least one distributed generator (DG) to regulate the system frequency and voltage. Therefore, switching control must be executed after the disconnection of the main grid and a strategy which includes a DG coordination method and a single-step load shedding scheme is proposed. Other factors also have a substantial impact on the system transient performance, including the type of subsystem load, the DG penetration level, the fault clearance time and the switching control delay. To perform the study, a distribution subsystem was simulated using PSCAD/EMTDC software, consisting of a mix of synchronous and inverter-based DGs and a combination of static loads and dynamic motor loads. Simulation results show the proposed switching control strategy can effectively ensure successful switching from grid-connected to Islanded mode under different fault conditions and DG penetration levels.
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synchronous Islanded Operation of a diesel generator
IEEE Transactions on Power Systems, 2007Co-Authors: D J Morrow, D J Mcgowa, P A CrossleyAbstract:The amount of distributed generation connected to the distribution network is increasing. To use this resource more effectively, splitting of the distribution network, or islanding the system, for prevention of power outages is being considered by some utilities. In this paper an islanding method that avoids out-of-synchronism re-closure is proposed. The island is kept in synchronism with the rest of the utility while it is not electrically connected. This is referred to as synchronous Islanded Operation. A phase difference control algorithm, developed by the authors, was tested in a single set scenario on a 50-kVA diesel generator using two different governors. These are the ldquostandard productrdquo variable gain governor of the diesel generator and a governor developed by the authors, which utilizes supplementary inputs in addition to engine speed. The results show that phase difference can be controlled within acceptable limits, both in steady state and after load disturbances are applied. The advantages of employing supplementary governor inputs are fully evaluated.
Nikos D. Hatziargyriou - One of the best experts on this subject based on the ideXlab platform.
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Seamless Transition Between Interconnected and Islanded Operation of DC Microgrids
IEEE Transactions on Smart Grid, 2019Co-Authors: Vasilis A. Kleftakis, Dimitris T. Lagos, Christina Papadimitriou, Nikos D. HatziargyriouAbstract:In this paper, a seamless interchange method between interconnected and Islanded Operational mode of a DC Microgrid is presented. The DC Microgrid examined consists of photovoltaic generation, batteries, and loads. A novel islanding detection method is presented ensuring fast detection of the islanding condition. The proposed detection method is based on the insertion of a controllable load in parallel with the DC Microgrid central switch. To achieve seamless interconnection to the utility grid, a proportional-integral (PI) regulator is installed in the Microgrid central controller. The PI regulator sends to the voltage forming unit (batteries) the appropriate setpoint, in order to align the voltage of the DC Microgrid to the utility network voltage during reconnection. The performance of the proposed control strategy is evaluated through simulations and Control Hardware-in-the-loop experiments performed at the Electric Energy Systems Laboratory, National Technical University of Athens.
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control of variable speed wind turbines in Islanded mode of Operation
IEEE Transactions on Energy Conversion, 2008Co-Authors: F D Kanellos, Nikos D. HatziargyriouAbstract:Nowadays, technology evolution and deregulation of the electric utility industry enable distributed generation (DG) to play an increasing role in locally satisfying the expanding power demand. In this paper, the Islanded Operation of an electrical grid supplied by wind turbines, which belong to the most rapidly expanding DG technologies, is studied. Control strategies for power electronics interface of variable speed wind turbines, ensuring fast control of frequency and voltage, are proposed.
Fan Lijuan - One of the best experts on this subject based on the ideXlab platform.
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On Stability of Islanded Operation of Yunnan-Guangdong UHVDC Project
Southern Power System Technology, 2010Co-Authors: Fan LijuanAbstract:Firstly,according to the especial status of the Islanded Operation of Yunnan-Guangdong UHVDC,special stability criteria are proposed for the Islanded Operation.Secondly,static voltage stability problems are analyzed,static voltage stability margin index is presented,and stability limits and margins are calculated for typical Islanded Operation conditions.Thirdly,system responses of the Islanded system to N-1,N-2,and other severe faults of lines and generators are studied and its transient voltage and frequency stability characteristics are generally discovered.Finally,suggestions on stability enhancement and security Operation for Islanded Operation are proposed.
