Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions
In this paper, a Luenberger observer-based microgrid control strategy is proposed to enhance the power quality of microgrids, when the grid loads are mixed and strongly non-linear. To improve performance under this condition, a Luenberger observer is designed for three phase power grids. On the basi...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-05-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/10/3655 |
| _version_ | 1797500173573685248 |
|---|---|
| author | Yong Cheng Cong Li |
| author_facet | Yong Cheng Cong Li |
| author_sort | Yong Cheng |
| collection | DOAJ |
| description | In this paper, a Luenberger observer-based microgrid control strategy is proposed to enhance the power quality of microgrids, when the grid loads are mixed and strongly non-linear. To improve performance under this condition, a Luenberger observer is designed for three phase power grids. On the basis of the observer, the components of different frequencies and sequences of voltages and currents are obtained accurately. The virtual impedance of different frequencies and sequences is designed, which makes the equivalent line impedance meet the power-sharing condition, reducing the fundamental negative sequence voltages and harmonic voltages. The active power droop equation, meanwhile, is proposed, where the bus voltage is modified. The value range of virtual impedance is discussed in the complex frequency domain. The proposed control strategy does not require any communication lines, so the hardware structure is simplified. The simulations and experiments are provided to verify the effectiveness of the proposed method. |
| first_indexed | 2024-03-10T03:58:04Z |
| format | Article |
| id | doaj.art-758d1ce791854911954c81a3bb956757 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T03:58:04Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-758d1ce791854911954c81a3bb9567572023-11-23T10:51:14ZengMDPI AGEnergies1996-10732022-05-011510365510.3390/en15103655Luenberger Observer-Based Microgrid Control Strategy for Mixed Load ConditionsYong Cheng0Cong Li1College of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaIn this paper, a Luenberger observer-based microgrid control strategy is proposed to enhance the power quality of microgrids, when the grid loads are mixed and strongly non-linear. To improve performance under this condition, a Luenberger observer is designed for three phase power grids. On the basis of the observer, the components of different frequencies and sequences of voltages and currents are obtained accurately. The virtual impedance of different frequencies and sequences is designed, which makes the equivalent line impedance meet the power-sharing condition, reducing the fundamental negative sequence voltages and harmonic voltages. The active power droop equation, meanwhile, is proposed, where the bus voltage is modified. The value range of virtual impedance is discussed in the complex frequency domain. The proposed control strategy does not require any communication lines, so the hardware structure is simplified. The simulations and experiments are provided to verify the effectiveness of the proposed method.https://www.mdpi.com/1996-1073/15/10/3655low-voltage microgriddroop controlharmonic power-sharingvirtual impedanceLuenberger observerpower quality |
| spellingShingle | Yong Cheng Cong Li Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions Energies low-voltage microgrid droop control harmonic power-sharing virtual impedance Luenberger observer power quality |
| title | Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions |
| title_full | Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions |
| title_fullStr | Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions |
| title_full_unstemmed | Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions |
| title_short | Luenberger Observer-Based Microgrid Control Strategy for Mixed Load Conditions |
| title_sort | luenberger observer based microgrid control strategy for mixed load conditions |
| topic | low-voltage microgrid droop control harmonic power-sharing virtual impedance Luenberger observer power quality |
| url | https://www.mdpi.com/1996-1073/15/10/3655 |
| work_keys_str_mv | AT yongcheng luenbergerobserverbasedmicrogridcontrolstrategyformixedloadconditions AT congli luenbergerobserverbasedmicrogridcontrolstrategyformixedloadconditions |