Analysis of the sympathetic tripping problem for networks with high penetrations of Distributed Generation

Jennett, Kyle; Booth, Campbell; Lee, Martin

doi:10.1109/apap.2011.6180432

Cited by 10 publications

(11 citation statements)

References 3 publications

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“…For example, [14] stipulates that in the event of a network undervoltage, converters are required to remain connected for a minimum of 140 ms to avoid sympathetic tripping for faults elsewhere in the network [15]. However it is difficult to see how these requirements apply to less robust converter types, where connection for this period of time may result in the flow of damaging current magnitudes flowing through the converter.…”

Section: Quantification Of DC Protection System Operating Requirementioning

confidence: 99%

“…In this manner, the underdamped response impedance can be expressed as (15) and the overdamped impedance is equal to (16) Having derived these expressions it can be seen how the various circuit parameters shape the transient response. For example, shows how the resistance and inductance parameters affect the exponential decay.…”

Section: A Analysis Of DC Microgrid Fault Responsementioning

confidence: 99%

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Optimizing the Roles of Unit and Non-unit Protection Methods Within DC Microgrids

Fletcher

Norman

Galloway

et al. 2012

IEEE Trans. Smart Grid

191

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The characteristic behavior of physically compact, multiterminal dc networks under electrical fault conditions can produce demanding protection requirements. This represents a significant barrier to more widespread adoption of dc power distribution for microgrid applications. Protection schemes have been proposed within literature for such networks based around the use of non-unit protection methods. This paper shows however that there are severe limitations to the effectiveness of such schemes when employed for more complex microgrid network architectures. Even current differential schemes, which offer a more effective, though costly, protection solution, must be carefully designed to meet the design requirements resulting from the unique fault characteristics of dc microgrids. This paper presents a detailed analysis of dc microgrid behavior under fault conditions, illustrating the challenging protection requirements and demonstrating the shortcomings of non-unit approaches for these applications. Whilst the performance requirements for the effective operation of differential schemes in dc microgrids are shown to be stringent, the authors show how these may be met using COTS technologies. The culmination of this work is the proposal of a flexible protection scheme design framework for dc microgrid applications which enables the required levels of fault discrimination to be achieved whilst minimizing the associated installation costs.Index Terms-DC power systems, fault currents, microgrid, power system protection.

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Section: Quantification Of DC Protection System Operating Requirementioning

confidence: 99%

Section: A Analysis Of DC Microgrid Fault Responsementioning

confidence: 99%

Optimizing the Roles of Unit and Non-unit Protection Methods Within DC Microgrids

Fletcher

Norman

Galloway

et al. 2012

IEEE Trans. Smart Grid

191

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“…On the contrary, the DG presence causes some technical problems that must be rapidly faced and solved like:  The increase of short circuit currents;  The increased complexity of automation and protection systems;  The increased complexity of voltage regulation due to a modification of power flows;  The unwanted MV systems islanding [9,10].…”

Section: Distributed Generation Possible Benefits and Problematicsmentioning

confidence: 99%

A Perspective on the Future of Distribution: Smart Grids, State of the Art, Benefits and Research Plans

Miceli¹,

Favuzza²,

Genduso³

2013

EPE

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Currently, the design and operation criteria for electrical distribution networks are fastly changing due to some factors; among these, the progressive penetration of Distributed Generation (DG) is destined to cause deep changes in the existing networks, no longer considered as passive terminations of the whole electrical system. Moreover, the in- creasing application of Information Communication Technologies (ICT) will allow the implementation of the so called “smart grids”, determining new interesting scenarios. In the paper the problems and the potential benefits of DG, the possible new electrical distribution system models and the major research projects on smart grids are faced and reported

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“…However, with regards to the undervoltage protection requirements evaluated and reported upon in this paper there is no conflict. This paper builds on the work of [9] by evaluating the response of a single-phase 3 kW inverter to faults in a laboratory environment (section 2). The observed responses have subsequently been used to create a model of the inverter within the PSCAD simulation package [18]; this allows the behaviour of several small inverter installations to be characterised accurately.…”

Section: /11kvmentioning

confidence: 99%

“…Kyle I. Jennett, Campbell D. Booth, Federico Coffele and Andrew J. Roscoe 2 [5,6], unwanted islanding [7,8] and sympathetic tripping [9,10]. The severity of these problems is likely to increase as Distributed Generation proliferates in future.…”

Section: Investigation Of the Sympathetic Tripping Problem In Power Smentioning

confidence: 99%

Investigation of the sympathetic tripping problem in power systems with large penetrations of distributed generation

Jennett

Booth

Coffele

et al. 2015

IET Generation, Transmission & Distribution

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This paper contains an investigation into sympathetic tripping -the undesirable disconnection of Distributed Generators (DGs) (in accordance with the recently-introduced G83/2 undervoltage protection) when a network fault occurs in the vicinity of the DG and is not cleared quickly enough by the network protection (i.e. before the DG's undervoltage protection operates). An evaluation of the severity of and proposal of solutions to the problem of sympathetic tripping on a typical UK distribution power network is presented. An inverter model (as the majority of DGs will be inverter-interfaced) that characterises the fault response of the inverter and its associated protection functions has been developed for use in simulation through exhaustive laboratory testing of a commercially-available 3 kW inverter for DG application; the observed responses have been modelled and incorporated in a power system simulation package. It is shown, when using presently-adopted DG interface and network protection settings, that the risk of sympathetic tripping is high in several future scenarios. To mitigate this risk, the impact of modifying network protection settings is evaluated. This paper has two key findings -determination of the conditions at which the risk of sympathetic tripping is high and evaluation of a technique to mitigate this risk.

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Analysis of the sympathetic tripping problem for networks with high penetrations of Distributed Generation

Cited by 10 publications

References 3 publications

Optimizing the Roles of Unit and Non-unit Protection Methods Within DC Microgrids

Optimizing the Roles of Unit and Non-unit Protection Methods Within DC Microgrids

A Perspective on the Future of Distribution: Smart Grids, State of the Art, Benefits and Research Plans

Investigation of the sympathetic tripping problem in power systems with large penetrations of distributed generation

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