Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs
In this study, a DC micro-grid consisting of multiple paralleled energy resources interfaced by both bidirectional AC/DC and DC/DC boost converters and loaded by a constant power load (CPL) is investigated. By considering the generic dq transformation of the AC/DC converters' dynamics and the a...
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| Format: | Article |
| Language: | English |
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Wiley
2020-03-01
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| Series: | IET Smart Grid |
| Subjects: | |
| Online Access: | https://digital-library.theiet.org/content/journals/10.1049/iet-stg.2019.0235 |
| _version_ | 1819122646140321792 |
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| author | Andrei-Constantin Braitor George C. Konstantopoulos George C. Konstantopoulos Visakan Kadirkamanathan |
| author_facet | Andrei-Constantin Braitor George C. Konstantopoulos George C. Konstantopoulos Visakan Kadirkamanathan |
| author_sort | Andrei-Constantin Braitor |
| collection | DOAJ |
| description | In this study, a DC micro-grid consisting of multiple paralleled energy resources interfaced by both bidirectional AC/DC and DC/DC boost converters and loaded by a constant power load (CPL) is investigated. By considering the generic dq transformation of the AC/DC converters' dynamics and the accurate nonlinear model of the DC/DC converters, two novel control schemes are presented for each converter-interfaced unit to guarantee load voltage regulation, power sharing and closed-loop system stability. This novel framework incorporates the widely adopted droop control and using input-to-state stability theory, it is proven that each converter guarantees a desired current limitation without the need for cascaded control and saturation blocks. Sufficient conditions to ensure closed-loop system stability are analytically obtained and tested for different operation scenarios. The system stability is further analysed from a graphical perspective, providing valuable insights of the CPL's influence onto the system performance and stability. The proposed control performance and the theoretical analysis are first validated by simulating a three-phase AC/DC converter in parallel with a bidirectional DC/DC boost converter feeding a CPL in comparison with the cascaded PI control technique. Finally, experimental results are also provided to demonstrate the effectiveness of the proposed control approach on a real testbed. |
| first_indexed | 2024-12-22T06:55:45Z |
| format | Article |
| id | doaj.art-a8149a6b55f344ceacd9ba0b8e9a5eb5 |
| institution | Directory Open Access Journal |
| issn | 2515-2947 |
| language | English |
| last_indexed | 2024-12-22T06:55:45Z |
| publishDate | 2020-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | IET Smart Grid |
| spelling | doaj.art-a8149a6b55f344ceacd9ba0b8e9a5eb52022-12-21T18:34:58ZengWileyIET Smart Grid2515-29472020-03-0110.1049/iet-stg.2019.0235IET-STG.2019.0235Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLsAndrei-Constantin Braitor0George C. Konstantopoulos1George C. Konstantopoulos2Visakan Kadirkamanathan3The University of SheffieldThe University of SheffieldThe University of SheffieldThe University of SheffieldIn this study, a DC micro-grid consisting of multiple paralleled energy resources interfaced by both bidirectional AC/DC and DC/DC boost converters and loaded by a constant power load (CPL) is investigated. By considering the generic dq transformation of the AC/DC converters' dynamics and the accurate nonlinear model of the DC/DC converters, two novel control schemes are presented for each converter-interfaced unit to guarantee load voltage regulation, power sharing and closed-loop system stability. This novel framework incorporates the widely adopted droop control and using input-to-state stability theory, it is proven that each converter guarantees a desired current limitation without the need for cascaded control and saturation blocks. Sufficient conditions to ensure closed-loop system stability are analytically obtained and tested for different operation scenarios. The system stability is further analysed from a graphical perspective, providing valuable insights of the CPL's influence onto the system performance and stability. The proposed control performance and the theoretical analysis are first validated by simulating a three-phase AC/DC converter in parallel with a bidirectional DC/DC boost converter feeding a CPL in comparison with the cascaded PI control technique. Finally, experimental results are also provided to demonstrate the effectiveness of the proposed control approach on a real testbed.https://digital-library.theiet.org/content/journals/10.1049/iet-stg.2019.0235cascade controlnonlinear control systemsvoltage controlac-dc power convertorscontrol system synthesispower distribution controlelectric current controlclosed loop systemspower generation controldistributed power generationdc-dc power convertorspower system stabilitycontrol designcpldc microgrid architecturemultiple paralleled energy resourcesconstant power loadnonlinear modelcontrol schemesconverter-interfaced unitload voltage regulationpower sharingclosed-loop system stabilitynovel control frameworkinput-to-state stability theoryconverter unitcurrent limitationcascaded controldc microgrid instabilitysystem performancecontrol performancetheoretical stability analysistraditional cascaded pi control techniquecontrol approachdroop control expressions |
| spellingShingle | Andrei-Constantin Braitor George C. Konstantopoulos George C. Konstantopoulos Visakan Kadirkamanathan Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs IET Smart Grid cascade control nonlinear control systems voltage control ac-dc power convertors control system synthesis power distribution control electric current control closed loop systems power generation control distributed power generation dc-dc power convertors power system stability control design cpl dc microgrid architecture multiple paralleled energy resources constant power load nonlinear model control schemes converter-interfaced unit load voltage regulation power sharing closed-loop system stability novel control framework input-to-state stability theory converter unit current limitation cascaded control dc microgrid instability system performance control performance theoretical stability analysis traditional cascaded pi control technique control approach droop control expressions |
| title | Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs |
| title_full | Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs |
| title_fullStr | Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs |
| title_full_unstemmed | Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs |
| title_short | Stability analysis and nonlinear current-limiting control design for DC micro-grids with CPLs |
| title_sort | stability analysis and nonlinear current limiting control design for dc micro grids with cpls |
| topic | cascade control nonlinear control systems voltage control ac-dc power convertors control system synthesis power distribution control electric current control closed loop systems power generation control distributed power generation dc-dc power convertors power system stability control design cpl dc microgrid architecture multiple paralleled energy resources constant power load nonlinear model control schemes converter-interfaced unit load voltage regulation power sharing closed-loop system stability novel control framework input-to-state stability theory converter unit current limitation cascaded control dc microgrid instability system performance control performance theoretical stability analysis traditional cascaded pi control technique control approach droop control expressions |
| url | https://digital-library.theiet.org/content/journals/10.1049/iet-stg.2019.0235 |
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