Smart Transformer-Based Single Phase-To-Neutral Fault Management
The smart transformer (ST), with its high control capability, offers new features for optimizing the management of the distribution grid. The ST, by controlling the voltage in each phase independently, is able to manage the operations during grid faults, in particular in the single-phase ones. The S...
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Veröffentlicht in: | IEEE transactions on power delivery 2019-06, Vol.34 (3), p.1049-1059 |
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description | The smart transformer (ST), with its high control capability, offers new features for optimizing the management of the distribution grid. The ST, by controlling the voltage in each phase independently, is able to manage the operations during grid faults, in particular in the single-phase ones. The ST, when a single-phase-to-ground fault occurs, can rapidly reduce the voltage in the phase under fault. Thus, it guarantees system safety and operates with the remaining two healthy phases to avoid unnecessary interruption in the healthy lines. However, the two-phase asymmetrical operation challenges the system performances due to the high power 2nd harmonic ripple in the dc voltage, that reduces the capacitors, lifespan and the high current flowing in the neutral conductor. These issues would force the grid operator to increase the ST maintenance, in order to avoid unplanned faults in the ST hardware, due to failure of aged capacitors. This paper presents a flexible-control strategy, based on the phase-shift angle control between two healthy-phase voltages, that reduces the impact of the power 2nd harmonic oscillation and thus can delay the maintenance intervention. The proposed strategy aims to improve system performances by avoiding neutral-line current overload and attenuating ac side active power (low voltage dc-link voltage) oscillation. Depending on the grid conditions (small dc link capacitance or low ampacity of neutral cable), the voltage angle can be adapted, minimizing the impact of the two-phase operation system in the ST-fed grid. The effectiveness and feasibility of the proposed approach have been validated experimentally with a simplified microgrid setup. |
doi_str_mv | 10.1109/TPWRD.2019.2899518 |
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The ST, by controlling the voltage in each phase independently, is able to manage the operations during grid faults, in particular in the single-phase ones. The ST, when a single-phase-to-ground fault occurs, can rapidly reduce the voltage in the phase under fault. Thus, it guarantees system safety and operates with the remaining two healthy phases to avoid unnecessary interruption in the healthy lines. However, the two-phase asymmetrical operation challenges the system performances due to the high power 2nd harmonic ripple in the dc voltage, that reduces the capacitors, lifespan and the high current flowing in the neutral conductor. These issues would force the grid operator to increase the ST maintenance, in order to avoid unplanned faults in the ST hardware, due to failure of aged capacitors. This paper presents a flexible-control strategy, based on the phase-shift angle control between two healthy-phase voltages, that reduces the impact of the power 2nd harmonic oscillation and thus can delay the maintenance intervention. The proposed strategy aims to improve system performances by avoiding neutral-line current overload and attenuating ac side active power (low voltage dc-link voltage) oscillation. Depending on the grid conditions (small dc link capacitance or low ampacity of neutral cable), the voltage angle can be adapted, minimizing the impact of the two-phase operation system in the ST-fed grid. The effectiveness and feasibility of the proposed approach have been validated experimentally with a simplified microgrid setup.</description><identifier>ISSN: 0885-8977</identifier><identifier>EISSN: 1937-4208</identifier><identifier>DOI: 10.1109/TPWRD.2019.2899518</identifier><identifier>CODEN: ITPDE5</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Alternating current ; Capacitors ; Conductors ; DC-link capacitor lifetime ; Distributed generation ; Harmonic analysis ; Harmonic oscillation ; Line current ; Low voltage ; Maintenance engineering ; Neutral conductors ; neutral current ; Oscillators ; Performance enhancement ; Phase transitions ; Power system harmonics ; single-phase-to-neutral faults ; smart transformer ; Transformers ; two-phase operation ; Voltage control</subject><ispartof>IEEE transactions on power delivery, 2019-06, Vol.34 (3), p.1049-1059</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c339t-b4538c12d4acfe93298fc001e8978c90c46699615261d488aec825a9b3a22a843</citedby><cites>FETCH-LOGICAL-c339t-b4538c12d4acfe93298fc001e8978c90c46699615261d488aec825a9b3a22a843</cites><orcidid>0000-0002-3700-2902 ; 0000-0001-9909-7516 ; 0000-0002-8030-4738</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/8642327$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>314,780,784,796,27924,27925,54758</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/8642327$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc></links><search><creatorcontrib>De Carne, Giovanni</creatorcontrib><creatorcontrib>Langwasser, Marius</creatorcontrib><creatorcontrib>Zhu, Rongwu</creatorcontrib><creatorcontrib>Liserre, Marco</creatorcontrib><title>Smart Transformer-Based Single Phase-To-Neutral Fault Management</title><title>IEEE transactions on power delivery</title><addtitle>TPWRD</addtitle><description>The smart transformer (ST), with its high control capability, offers new features for optimizing the management of the distribution grid. The ST, by controlling the voltage in each phase independently, is able to manage the operations during grid faults, in particular in the single-phase ones. The ST, when a single-phase-to-ground fault occurs, can rapidly reduce the voltage in the phase under fault. Thus, it guarantees system safety and operates with the remaining two healthy phases to avoid unnecessary interruption in the healthy lines. However, the two-phase asymmetrical operation challenges the system performances due to the high power 2nd harmonic ripple in the dc voltage, that reduces the capacitors, lifespan and the high current flowing in the neutral conductor. These issues would force the grid operator to increase the ST maintenance, in order to avoid unplanned faults in the ST hardware, due to failure of aged capacitors. This paper presents a flexible-control strategy, based on the phase-shift angle control between two healthy-phase voltages, that reduces the impact of the power 2nd harmonic oscillation and thus can delay the maintenance intervention. The proposed strategy aims to improve system performances by avoiding neutral-line current overload and attenuating ac side active power (low voltage dc-link voltage) oscillation. Depending on the grid conditions (small dc link capacitance or low ampacity of neutral cable), the voltage angle can be adapted, minimizing the impact of the two-phase operation system in the ST-fed grid. The effectiveness and feasibility of the proposed approach have been validated experimentally with a simplified microgrid setup.</description><subject>Alternating current</subject><subject>Capacitors</subject><subject>Conductors</subject><subject>DC-link capacitor lifetime</subject><subject>Distributed generation</subject><subject>Harmonic analysis</subject><subject>Harmonic oscillation</subject><subject>Line current</subject><subject>Low voltage</subject><subject>Maintenance engineering</subject><subject>Neutral conductors</subject><subject>neutral current</subject><subject>Oscillators</subject><subject>Performance enhancement</subject><subject>Phase transitions</subject><subject>Power system harmonics</subject><subject>single-phase-to-neutral faults</subject><subject>smart transformer</subject><subject>Transformers</subject><subject>two-phase operation</subject><subject>Voltage control</subject><issn>0885-8977</issn><issn>1937-4208</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kE1PwkAQhjdGExH9A3pp4nlx9qPtzs1P1ASVSI3HzbJMEQIt7rYH_71FiKfJJO8zHw9j5wIGQgBeFePP9_uBBIEDaRBTYQ5YT6DKuZZgDlkPjEm5wTw_ZicxLgFAA0KPXU_WLjRJEVwVyzqsKfBbF2mWTBbVfEXJ-KvreFHzV2qb4FbJ0LWrJnlxlZvTmqrmlB2VbhXpbF_77GP4UNw98dHb4_PdzYh7pbDhU50q44WcaedLQiXRlB5AUHeT8QheZxliJlKZiZk2xpE3MnU4VU5KZ7Tqs8vd3E2ov1uKjV3Wbai6lVZKBXkuIFNdSu5SPtQxBirtJiy6D3-sALs1Zf9M2a0puzfVQRc7aEFE_4DJtFQyV7-9S2NG</recordid><startdate>20190601</startdate><enddate>20190601</enddate><creator>De Carne, Giovanni</creator><creator>Langwasser, Marius</creator><creator>Zhu, Rongwu</creator><creator>Liserre, Marco</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7TB</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-3700-2902</orcidid><orcidid>https://orcid.org/0000-0001-9909-7516</orcidid><orcidid>https://orcid.org/0000-0002-8030-4738</orcidid></search><sort><creationdate>20190601</creationdate><title>Smart Transformer-Based Single Phase-To-Neutral Fault Management</title><author>De Carne, Giovanni ; Langwasser, Marius ; Zhu, Rongwu ; Liserre, Marco</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c339t-b4538c12d4acfe93298fc001e8978c90c46699615261d488aec825a9b3a22a843</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Alternating current</topic><topic>Capacitors</topic><topic>Conductors</topic><topic>DC-link capacitor lifetime</topic><topic>Distributed generation</topic><topic>Harmonic analysis</topic><topic>Harmonic oscillation</topic><topic>Line current</topic><topic>Low voltage</topic><topic>Maintenance engineering</topic><topic>Neutral conductors</topic><topic>neutral current</topic><topic>Oscillators</topic><topic>Performance enhancement</topic><topic>Phase transitions</topic><topic>Power system harmonics</topic><topic>single-phase-to-neutral faults</topic><topic>smart transformer</topic><topic>Transformers</topic><topic>two-phase operation</topic><topic>Voltage control</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>De Carne, Giovanni</creatorcontrib><creatorcontrib>Langwasser, Marius</creatorcontrib><creatorcontrib>Zhu, Rongwu</creatorcontrib><creatorcontrib>Liserre, Marco</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>IEEE transactions on power delivery</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>De Carne, Giovanni</au><au>Langwasser, Marius</au><au>Zhu, Rongwu</au><au>Liserre, Marco</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Smart Transformer-Based Single Phase-To-Neutral Fault Management</atitle><jtitle>IEEE transactions on power delivery</jtitle><stitle>TPWRD</stitle><date>2019-06-01</date><risdate>2019</risdate><volume>34</volume><issue>3</issue><spage>1049</spage><epage>1059</epage><pages>1049-1059</pages><issn>0885-8977</issn><eissn>1937-4208</eissn><coden>ITPDE5</coden><abstract>The smart transformer (ST), with its high control capability, offers new features for optimizing the management of the distribution grid. 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This paper presents a flexible-control strategy, based on the phase-shift angle control between two healthy-phase voltages, that reduces the impact of the power 2nd harmonic oscillation and thus can delay the maintenance intervention. The proposed strategy aims to improve system performances by avoiding neutral-line current overload and attenuating ac side active power (low voltage dc-link voltage) oscillation. Depending on the grid conditions (small dc link capacitance or low ampacity of neutral cable), the voltage angle can be adapted, minimizing the impact of the two-phase operation system in the ST-fed grid. 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subjects | Alternating current Capacitors Conductors DC-link capacitor lifetime Distributed generation Harmonic analysis Harmonic oscillation Line current Low voltage Maintenance engineering Neutral conductors neutral current Oscillators Performance enhancement Phase transitions Power system harmonics single-phase-to-neutral faults smart transformer Transformers two-phase operation Voltage control |
title | Smart Transformer-Based Single Phase-To-Neutral Fault Management |
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