Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network
This paper discusses the operation and control of a low-voltage DC (LVDC) isolated distribution network powered by distributed generation (DG) from a variable-speed wind turbine induction generator (WTIG) to supply unbalanced AC loads. The system incorporates a DC-DC storage converter to regulate ne...
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MDPI AG
2025-04-01
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| Series: | Electricity |
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| Online Access: | https://www.mdpi.com/2673-4826/6/2/21 |
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| author | Hossein Amini Reza Noroozian |
| author_facet | Hossein Amini Reza Noroozian |
| author_sort | Hossein Amini |
| collection | DOAJ |
| description | This paper discusses the operation and control of a low-voltage DC (LVDC) isolated distribution network powered by distributed generation (DG) from a variable-speed wind turbine induction generator (WTIG) to supply unbalanced AC loads. The system incorporates a DC-DC storage converter to regulate network voltages and interconnect battery energy storage with the DC network. The wind turbines are equipped with a squirrel cage induction generator (IG) to connect a DC network via individual power inverters (WTIG inverters). Loads are unbalanced ACs and are interfaced using transformerless power inverters, referred to as load inverters. The DC-DC converter is equipped with a novel control strategy, utilizing a droop regulator for the DC voltage to stabilize network operation. The control system is modeled based on Clark and Park transformations and is developed for the load inverters to provide balanced AC voltage despite unbalanced load conditions. The system employs the perturbation and observation (P&O) method for maximum power point tracking (MPPT) to optimize wind energy utilization, while blade angle controllers maintain generator performance within rated power and speed limits under high wind conditions. System operation is analyzed under two scenarios: normal operation with varying wind speeds and the effects of load variations. Simulation results using PSCAD/EMTDC demonstrate that the proposed LVDC isolated distribution network (DC) achieves a stable DC bus voltage within ±5% of the nominal value, efficiently delivers balanced AC voltages with unbalanced levels below 2%, and operates with over 90% wind energy utilization during varying wind speeds, confirming LVDC network reliability and robustness. |
| format | Article |
| id | doaj-art-81b51ff478f14e7996880b04fcdec479 |
| institution | Matheson Library |
| issn | 2673-4826 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electricity |
| spelling | doaj-art-81b51ff478f14e7996880b04fcdec4792025-06-25T13:44:55ZengMDPI AGElectricity2673-48262025-04-01622110.3390/electricity6020021Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution NetworkHossein Amini0Reza Noroozian1The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USADepartment of Electrical Engineering, University of Zanjan, University Blvd., Zanjan 45371-38791, IranThis paper discusses the operation and control of a low-voltage DC (LVDC) isolated distribution network powered by distributed generation (DG) from a variable-speed wind turbine induction generator (WTIG) to supply unbalanced AC loads. The system incorporates a DC-DC storage converter to regulate network voltages and interconnect battery energy storage with the DC network. The wind turbines are equipped with a squirrel cage induction generator (IG) to connect a DC network via individual power inverters (WTIG inverters). Loads are unbalanced ACs and are interfaced using transformerless power inverters, referred to as load inverters. The DC-DC converter is equipped with a novel control strategy, utilizing a droop regulator for the DC voltage to stabilize network operation. The control system is modeled based on Clark and Park transformations and is developed for the load inverters to provide balanced AC voltage despite unbalanced load conditions. The system employs the perturbation and observation (P&O) method for maximum power point tracking (MPPT) to optimize wind energy utilization, while blade angle controllers maintain generator performance within rated power and speed limits under high wind conditions. System operation is analyzed under two scenarios: normal operation with varying wind speeds and the effects of load variations. Simulation results using PSCAD/EMTDC demonstrate that the proposed LVDC isolated distribution network (DC) achieves a stable DC bus voltage within ±5% of the nominal value, efficiently delivers balanced AC voltages with unbalanced levels below 2%, and operates with over 90% wind energy utilization during varying wind speeds, confirming LVDC network reliability and robustness.https://www.mdpi.com/2673-4826/6/2/21balanced voltageisolated distribution networkpower flow controlunbalanced AC loadvariable speed wind turbines |
| spellingShingle | Hossein Amini Reza Noroozian Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network Electricity balanced voltage isolated distribution network power flow control unbalanced AC load variable speed wind turbines |
| title | Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network |
| title_full | Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network |
| title_fullStr | Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network |
| title_full_unstemmed | Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network |
| title_short | Standalone Operation of Inverter-Based Variable Speed Wind Turbines on DC Distribution Network |
| title_sort | standalone operation of inverter based variable speed wind turbines on dc distribution network |
| topic | balanced voltage isolated distribution network power flow control unbalanced AC load variable speed wind turbines |
| url | https://www.mdpi.com/2673-4826/6/2/21 |
| work_keys_str_mv | AT hosseinamini standaloneoperationofinverterbasedvariablespeedwindturbinesondcdistributionnetwork AT rezanoroozian standaloneoperationofinverterbasedvariablespeedwindturbinesondcdistributionnetwork |