A novel pre-synchronization control strategy for microgrid connections based on improved droop control
Microgrid control strategies based on traditional droop control often exhibit output voltage and frequency return errors. As such, this study proposes a novel pre-synchronization control strategy to improve both the accuracy and stability of voltage and frequency, suppress harmonics generated by an...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-11-01
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| Series: | Energy Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484722015165 |
| _version_ | 1797900696817762304 |
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| author | Wenbo Jiang Pan Li |
| author_facet | Wenbo Jiang Pan Li |
| author_sort | Wenbo Jiang |
| collection | DOAJ |
| description | Microgrid control strategies based on traditional droop control often exhibit output voltage and frequency return errors. As such, this study proposes a novel pre-synchronization control strategy to improve both the accuracy and stability of voltage and frequency, suppress harmonics generated by an inverter, and reduce the control errors. First, an improved droop control strategy was proposed to automatically adjust the microgrid output voltage and frequency in order to achieve power sharing and suppress voltage harmonics. A pre-synchronization controller was then used to compensate for the angular frequency during droop control, based on deviations in output voltage and frequency between the microgrid and power grid. This ensured stability and smooth switching between the two grids. Finally, a series of numerical simulations were conducted with the Matlab/Simulink software. The simulated results exhibited a frequency fluctuation range of 49.95–50.02 Hz, and 49.5–50.2 Hz for traditional droop control. In addition, a voltage deviation of only ±2.89% was observed from the nominal voltage (in both connected and islanded operation). The total harmonic distortion (THD) rate was 1.50% when the microgrid was connected to the power grid and 2.57% for traditional droop control. These results suggest the proposed control strategy to be highly effective and reliable. |
| first_indexed | 2024-04-10T08:49:02Z |
| format | Article |
| id | doaj.art-5d40eebed1374c519ed057703daee18a |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-04-10T08:49:02Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-5d40eebed1374c519ed057703daee18a2023-02-22T04:31:15ZengElsevierEnergy Reports2352-48472022-11-01812571264A novel pre-synchronization control strategy for microgrid connections based on improved droop controlWenbo Jiang0Pan Li1Corresponding author at: School of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039, China.; School of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039, China; Sichuan Provincial Key Laboratory of Signal and Information Processing, Xihua University, Chengdu 610039, ChinaSchool of Electrical Engineering and Electronic Information, Xihua University, Chengdu 610039, China; Sichuan Provincial Key Laboratory of Signal and Information Processing, Xihua University, Chengdu 610039, ChinaMicrogrid control strategies based on traditional droop control often exhibit output voltage and frequency return errors. As such, this study proposes a novel pre-synchronization control strategy to improve both the accuracy and stability of voltage and frequency, suppress harmonics generated by an inverter, and reduce the control errors. First, an improved droop control strategy was proposed to automatically adjust the microgrid output voltage and frequency in order to achieve power sharing and suppress voltage harmonics. A pre-synchronization controller was then used to compensate for the angular frequency during droop control, based on deviations in output voltage and frequency between the microgrid and power grid. This ensured stability and smooth switching between the two grids. Finally, a series of numerical simulations were conducted with the Matlab/Simulink software. The simulated results exhibited a frequency fluctuation range of 49.95–50.02 Hz, and 49.5–50.2 Hz for traditional droop control. In addition, a voltage deviation of only ±2.89% was observed from the nominal voltage (in both connected and islanded operation). The total harmonic distortion (THD) rate was 1.50% when the microgrid was connected to the power grid and 2.57% for traditional droop control. These results suggest the proposed control strategy to be highly effective and reliable.http://www.sciencedirect.com/science/article/pii/S2352484722015165Microgrid grid-connected/islanded operationPre-synchronous control strategyDroop controlHarmonic suppressionPower quality |
| spellingShingle | Wenbo Jiang Pan Li A novel pre-synchronization control strategy for microgrid connections based on improved droop control Energy Reports Microgrid grid-connected/islanded operation Pre-synchronous control strategy Droop control Harmonic suppression Power quality |
| title | A novel pre-synchronization control strategy for microgrid connections based on improved droop control |
| title_full | A novel pre-synchronization control strategy for microgrid connections based on improved droop control |
| title_fullStr | A novel pre-synchronization control strategy for microgrid connections based on improved droop control |
| title_full_unstemmed | A novel pre-synchronization control strategy for microgrid connections based on improved droop control |
| title_short | A novel pre-synchronization control strategy for microgrid connections based on improved droop control |
| title_sort | novel pre synchronization control strategy for microgrid connections based on improved droop control |
| topic | Microgrid grid-connected/islanded operation Pre-synchronous control strategy Droop control Harmonic suppression Power quality |
| url | http://www.sciencedirect.com/science/article/pii/S2352484722015165 |
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