Coordination of phase-shifting transformers to improve transmission network utilisation

Belivanis, Manolis; Bell, Keith

doi:10.1109/isgteurope.2010.5638916

Cited by 17 publications

(14 citation statements)

References 7 publications

(18 reference statements)

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“…These network branches are intended to represent the main route on which power flows across the GB transmission system [16]. Two HVDC links will be added (between 2 and 10 busbars and 5 and 29 busbars) to this model and the effect of these links on the dynamic stability will be analyzed.…”

Section: Discussionmentioning

confidence: 99%

Critical evaluation of reduced models for stability analysis on the GB transmission system

Rabbani

Taylor

Zobaa

2012

2012 47th International Universities Power Engineering Conference (UPEC)

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Energy and environmental issues are among the greatest challenges facing the world. In response to energy needs and environmental concerns, renewable energy technologies are now considered the future technologies of choice. Renewable energy is produced from freely available and non-polluting natural sources; however, its utilization is not without challenge. There is much interest in Great Britain (GB) among generation developers in the construction of new large-scale onshore and offshore wind farms, especially in Scotland.Here, a range of dynamic stability analysis techniques is evaluated with regard to disturbances in the transmission system using reduced models of the GB transmission system. The impact of embedded high voltage DC links in parallel with the existing AC system and in combination with a number of installations of series compensation, with regard to active power flow, voltage and reactive power flow is investigated. Both an initial steady state analysis and subsequently the dynamic and transient analysis of the proposed solutions were applied as a first step towards integration of wind farms into the power grid. The most important point is to ensure the stability of the GB system when a credible contingency occurs.

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Section: Discussionmentioning

confidence: 99%

Critical evaluation of reduced models for stability analysis on the GB transmission system

Rabbani

Taylor

Zobaa

2012

2012 47th International Universities Power Engineering Conference (UPEC)

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“…HEALER 1 does not require major interventions in the current load shedding actions of system operators. (ii) HEALER 2 combines HEALER 1 with "zero-cost" preventive actions undertaken by smart transformers before perturbations (early and core stage), as motivated in earlier work [8], [13]. (iii) HEALER 3 mitigates cascading failures after a system perturbation and after load shedding is applied (final stage).…”

Section: Disrupdve Event Detecdonmentioning

confidence: 99%

“…Devices such as phase measurement units (PMUs) can make data accessible to control centers in real-time [21], [22] so that the mitigation actions are immediately triggered. PMUs may provide data with the rate of up to 60 [23] or even 120 samples 8 per seconds in some industrial solutions. The feasibility of this approach is also shown in earlier work via the design of backup strategies under predefined systems conditions, The backup strategies use real-time fault analysis such as event trees [24] or controlled and optimized islanding of a power system in the order of milliseconds for its protection [25].…”

Section: E Computational Aspectsmentioning

confidence: 99%

“…Regulating the flow of a transmission system with multiple phase shift transformers is challenging as coordination is required given the non-linear dynamics of AC power flow networks. However, the cost-benefits of using coordinating phase shift transformers are well documented in earlier work [8]. As a cascading failure involves several network components, coordinating phase shift transformers is highly applicable in this context and scenarios.…”

Section: Introductionmentioning

confidence: 99%

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Self-Repairable Smart Grids Via Online Coordination of Smart Transformers

Pournaras

Espejo-Uribe

2017

IEEE Trans. Ind. Inf.

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The introduction of active devices in Smart Grids, such as smart transformers, powered by intelligent software and networking capabilities, brings paramount opportunities for online automated control and regulation. However, online mitigation of disruptive events such as cascading failures, is challenging. Local intelligence by itself cannot tackle such complex collective phenomena with domino effects. Collective intelligence coordinating rapid mitigation actions is required. This paper introduces analytical results from which two optimization strategies for self-repairable Smart Grids are derived. These strategies build a coordination mechanism for smart transformers that runs in three healing modes and performs collective decisionmaking of the phase angles in the lines of a transmission system to improve reliability under disruptive events, i.e. line failures causing cascading failures. Experimental evaluation using selfrepairability envelopes in different case networks, AC power flows and varying number of smart transformers confirms that the higher the number of smart transformers participating in the coordination, the higher the reliability and the capability of a network to self-repair.

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“…Our network model was modified from a version of a GB transmission network transient stability model given as Version 1 in [19]; this transient stability model itself was modified from an earlier steady state GB transmission network model used in [20] and [21] which was developed using principles outlined in [22].…”

Section: A Network Modelmentioning

confidence: 99%

Optimal Operation of the Western Link Embedded HVDC Connection

Leavy

Bukhsh

Bell

2018

2018 Power Systems Computation Conference (PSCC)

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Abstract-The Western Link is a new point-to-point embedded HVDC connection due to be commissioned in Great Britain in 2018. This paper investigates the optimal loading of the Western Link with respect to the wider transmission system. The work modelled a representation of behaviour of the wholesale market and system operator actions using mathematical optimisation in the form of an economic dispatch followed by an AC optimal power flow. A range of different system cases was studied using: a representative high voltage transmission network of Great Britain; system planned outages on AC circuits in parallel with the Western Link; system contingencies; and two possible post-contingency Western Link loading rules. It was concluded from the cases studied that the optimal dispatch of power on the Western Link is an affine function of power flow in the parallel AC circuits, modulated by system planned outages and the thermal rating of the Western Link.

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Coordination of phase-shifting transformers to improve transmission network utilisation

Cited by 17 publications

References 7 publications

Critical evaluation of reduced models for stability analysis on the GB transmission system

Critical evaluation of reduced models for stability analysis on the GB transmission system

Self-Repairable Smart Grids Via Online Coordination of Smart Transformers

Optimal Operation of the Western Link Embedded HVDC Connection

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