An Improved Active Damping Method Based on Single-Loop Inverter Current Control for LCL Resonance in Grid-Connected Inverters
This paper investigates active damping of LCL filter resonance in grid-connected inverters with only inverter current feedback control, since it only needs to sample one current to realize both current control and inverter protection. The traditional single-loop inverter current control (SLICC) can...
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| Veröffentlicht in: | Mathematical problems in engineering 2021-03, Vol.2021, p.1-11 |
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| creator | Wan, Xiaofeng Ding, Xiaohua Hu, Hailin |
| description | This paper investigates active damping of LCL filter resonance in grid-connected inverters with only inverter current feedback control, since it only needs to sample one current to realize both current control and inverter protection. The traditional single-loop inverter current control (SLICC) can damp the LCL filter resonance actively. However, if the control delay is considered in digital control, the system stability will depend on the ratio of the LCL resonance frequency fres to the sampling frequency fs, and the valid damping region is only up to fs/6. Considering that the design region of the LCL resonance frequency fres is up to fs/2 , the system can easily become unstable due to the LCL resonance frequency shifting. Thus, this paper proposes an improved active damping method based on SLICC, including the asymmetric regular sampling method and delay compensation method. The improved sampling method minimizes the control delay without introducing a switching ripple, and the delay compensation method further compensates for the delay effect. With a proper parameter design, the upper limit of the valid damping region is extended up to fs/2, which can cover all the possible resonance frequencies, and it has inherent robustness against grid-impedance variation. Finally, a few simulations in MATLAB/SIMULINK and experiments based on a 6 kW prototype are performed to verify the theoretical analysis. |
| doi_str_mv | 10.1155/2021/6643223 |
| format | Article |
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The traditional single-loop inverter current control (SLICC) can damp the LCL filter resonance actively. However, if the control delay is considered in digital control, the system stability will depend on the ratio of the LCL resonance frequency fres to the sampling frequency fs, and the valid damping region is only up to fs/6. Considering that the design region of the LCL resonance frequency fres is up to fs/2 , the system can easily become unstable due to the LCL resonance frequency shifting. Thus, this paper proposes an improved active damping method based on SLICC, including the asymmetric regular sampling method and delay compensation method. The improved sampling method minimizes the control delay without introducing a switching ripple, and the delay compensation method further compensates for the delay effect. With a proper parameter design, the upper limit of the valid damping region is extended up to fs/2, which can cover all the possible resonance frequencies, and it has inherent robustness against grid-impedance variation. Finally, a few simulations in MATLAB/SIMULINK and experiments based on a 6 kW prototype are performed to verify the theoretical analysis.</description><identifier>ISSN: 1024-123X</identifier><identifier>EISSN: 1563-5147</identifier><identifier>DOI: 10.1155/2021/6643223</identifier><language>eng</language><publisher>New York: Hindawi</publisher><subject>Active damping ; Compensation ; Control algorithms ; Control stability ; Delay ; Design parameters ; Digital signal processors ; Engineering ; Feedback control ; Inverters ; Methods ; Resonance ; Sampling methods ; Sensors ; Systems stability</subject><ispartof>Mathematical problems in engineering, 2021-03, Vol.2021, p.1-11</ispartof><rights>Copyright © 2021 Xiaofeng Wan et al.</rights><rights>Copyright © 2021 Xiaofeng Wan et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. https://creativecommons.org/licenses/by/4.0</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-61a64faaee5cdd6c6d4227f97f56e95a13d2344653bd8ee8e810a6262ca3a0533</citedby><cites>FETCH-LOGICAL-c337t-61a64faaee5cdd6c6d4227f97f56e95a13d2344653bd8ee8e810a6262ca3a0533</cites><orcidid>0000-0002-3168-6346 ; 0000-0003-3800-1511 ; 0000-0003-2664-8123</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><contributor>Wang, Licheng</contributor><contributor>Licheng Wang</contributor><creatorcontrib>Wan, Xiaofeng</creatorcontrib><creatorcontrib>Ding, Xiaohua</creatorcontrib><creatorcontrib>Hu, Hailin</creatorcontrib><title>An Improved Active Damping Method Based on Single-Loop Inverter Current Control for LCL Resonance in Grid-Connected Inverters</title><title>Mathematical problems in engineering</title><description>This paper investigates active damping of LCL filter resonance in grid-connected inverters with only inverter current feedback control, since it only needs to sample one current to realize both current control and inverter protection. The traditional single-loop inverter current control (SLICC) can damp the LCL filter resonance actively. However, if the control delay is considered in digital control, the system stability will depend on the ratio of the LCL resonance frequency fres to the sampling frequency fs, and the valid damping region is only up to fs/6. Considering that the design region of the LCL resonance frequency fres is up to fs/2 , the system can easily become unstable due to the LCL resonance frequency shifting. Thus, this paper proposes an improved active damping method based on SLICC, including the asymmetric regular sampling method and delay compensation method. The improved sampling method minimizes the control delay without introducing a switching ripple, and the delay compensation method further compensates for the delay effect. With a proper parameter design, the upper limit of the valid damping region is extended up to fs/2, which can cover all the possible resonance frequencies, and it has inherent robustness against grid-impedance variation. Finally, a few simulations in MATLAB/SIMULINK and experiments based on a 6 kW prototype are performed to verify the theoretical analysis.</description><subject>Active damping</subject><subject>Compensation</subject><subject>Control algorithms</subject><subject>Control stability</subject><subject>Delay</subject><subject>Design parameters</subject><subject>Digital signal processors</subject><subject>Engineering</subject><subject>Feedback control</subject><subject>Inverters</subject><subject>Methods</subject><subject>Resonance</subject><subject>Sampling methods</subject><subject>Sensors</subject><subject>Systems stability</subject><issn>1024-123X</issn><issn>1563-5147</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>RHX</sourceid><sourceid>BENPR</sourceid><recordid>eNp9kEtPwzAMgCMEEmNw4wdE4ghleTRpdxwFxqQiJB4StyokLuu0JSXJhjjw3wnauHKyZX-25Q-hU0ouKRVixAijIylzzhjfQwMqJM8EzYv9lBOWZ5Tx10N0FMKCJFLQcoC-JxbPVr13GzB4omO3AXytVn1n3_E9xLkz-EqF1HMWP6XiErLauR7P7AZ8BI-rtfdgI66cjd4tces8rqsaP0JwVlkNuLN46juTJcKCjmnX33A4RgetWgY42cUherm9ea7usvphOqsmdaY5L2ImqZJ5qxSA0MZILU3OWNGOi1ZIGAtFuWE8z6Xgb6YEKKGkREkmmVZcEcH5EJ1t96ZHP9YQYrNwa2_TyYYJQmlRJH-JuthS2rsQPLRN77uV8l8NJc2v4OZXcLMTnPDzLT7vrFGf3f_0D0bXelw</recordid><startdate>20210303</startdate><enddate>20210303</enddate><creator>Wan, Xiaofeng</creator><creator>Ding, Xiaohua</creator><creator>Hu, Hailin</creator><general>Hindawi</general><general>Hindawi Limited</general><scope>RHU</scope><scope>RHW</scope><scope>RHX</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TB</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>CWDGH</scope><scope>DWQXO</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>JQ2</scope><scope>K7-</scope><scope>KR7</scope><scope>L6V</scope><scope>M7S</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><orcidid>https://orcid.org/0000-0002-3168-6346</orcidid><orcidid>https://orcid.org/0000-0003-3800-1511</orcidid><orcidid>https://orcid.org/0000-0003-2664-8123</orcidid></search><sort><creationdate>20210303</creationdate><title>An Improved Active Damping Method Based on Single-Loop Inverter Current Control for LCL Resonance in Grid-Connected Inverters</title><author>Wan, Xiaofeng ; 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The traditional single-loop inverter current control (SLICC) can damp the LCL filter resonance actively. However, if the control delay is considered in digital control, the system stability will depend on the ratio of the LCL resonance frequency fres to the sampling frequency fs, and the valid damping region is only up to fs/6. Considering that the design region of the LCL resonance frequency fres is up to fs/2 , the system can easily become unstable due to the LCL resonance frequency shifting. Thus, this paper proposes an improved active damping method based on SLICC, including the asymmetric regular sampling method and delay compensation method. The improved sampling method minimizes the control delay without introducing a switching ripple, and the delay compensation method further compensates for the delay effect. 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| subjects | Active damping Compensation Control algorithms Control stability Delay Design parameters Digital signal processors Engineering Feedback control Inverters Methods Resonance Sampling methods Sensors Systems stability |
| title | An Improved Active Damping Method Based on Single-Loop Inverter Current Control for LCL Resonance in Grid-Connected Inverters |
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