Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids
Leading to the enormous growth in renewable and power electronics technologies and the global drive towards environmental friendliness and sustainability, a significant number of renewable energy sources are being connected to the power system via inverter-based systems. The inverter-based generatio...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Open Access Journal of Power and Energy |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9774378/ |
| _version_ | 1811239630133002240 |
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| author | Thilini Hathiyaldeniye Chandana Karawita Bagen Bagen Nalin Pahalawaththa Udaya D. Annakkage |
| author_facet | Thilini Hathiyaldeniye Chandana Karawita Bagen Bagen Nalin Pahalawaththa Udaya D. Annakkage |
| author_sort | Thilini Hathiyaldeniye |
| collection | DOAJ |
| description | Leading to the enormous growth in renewable and power electronics technologies and the global drive towards environmental friendliness and sustainability, a significant number of renewable energy sources are being connected to the power system via inverter-based systems. The inverter-based generations (IBG) have no stored energy and less fault current injection capability compared to the conventional synchronous machines. Consequently, a large penetration of IBG creates challenges to maintaining the stability of the power system, especially the transient stability. The weaker the power system, the higher the significance of instability. Few solutions exist in the literature to improve the fault recovery of IBG connected to weak power systems. This paper considers the method of storing energy in sub-module capacitors of the Modular-Multi-level Converter (MMC) along with temporarily boosting the inverter’s current limit. Conversely, increasing the ratings of the inverter will result in high manufacturing costs. Hence an optimization strategy is proposed in this paper, for obtaining a robust set of inverter control parameters that enhances fault recovery without excessively increasing the manufacturing cost of MMC. A frequency scanning technique supplemented with Generalized Nyquist criteria is incorporated into the optimization methodology to constrain the search space for the optimization algorithm. This enables the optimization algorithm to converge to an acceptable solution with a reasonable computing time. Furthermore, validation of the resultant set of parameters for different system conditions is presented. Finally, IBG with optimized fault recovery controllers is integrated into a simplified real-world power system, and the applicability of the proposed optimized controllers is illustrated. |
| first_indexed | 2024-04-12T13:04:33Z |
| format | Article |
| id | doaj.art-4a86e54cb98b4819a71f190498248ae5 |
| institution | Directory Open Access Journal |
| issn | 2687-7910 |
| language | English |
| last_indexed | 2024-04-12T13:04:33Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Access Journal of Power and Energy |
| spelling | doaj.art-4a86e54cb98b4819a71f190498248ae52022-12-22T03:32:05ZengIEEEIEEE Open Access Journal of Power and Energy2687-79102022-01-01916117210.1109/OAJPE.2022.31751299774378Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power GridsThilini Hathiyaldeniye0https://orcid.org/0000-0003-2409-5692Chandana Karawita1Bagen Bagen2https://orcid.org/0000-0002-3246-2133Nalin Pahalawaththa3Udaya D. Annakkage4https://orcid.org/0000-0002-1361-6694Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, CanadaTransgrid Solutions Inc, Winnipeg, MB, CanadaDepartment of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, CanadaHatch Ltd, North Sydney, NSW, AustraliaDepartment of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, CanadaLeading to the enormous growth in renewable and power electronics technologies and the global drive towards environmental friendliness and sustainability, a significant number of renewable energy sources are being connected to the power system via inverter-based systems. The inverter-based generations (IBG) have no stored energy and less fault current injection capability compared to the conventional synchronous machines. Consequently, a large penetration of IBG creates challenges to maintaining the stability of the power system, especially the transient stability. The weaker the power system, the higher the significance of instability. Few solutions exist in the literature to improve the fault recovery of IBG connected to weak power systems. This paper considers the method of storing energy in sub-module capacitors of the Modular-Multi-level Converter (MMC) along with temporarily boosting the inverter’s current limit. Conversely, increasing the ratings of the inverter will result in high manufacturing costs. Hence an optimization strategy is proposed in this paper, for obtaining a robust set of inverter control parameters that enhances fault recovery without excessively increasing the manufacturing cost of MMC. A frequency scanning technique supplemented with Generalized Nyquist criteria is incorporated into the optimization methodology to constrain the search space for the optimization algorithm. This enables the optimization algorithm to converge to an acceptable solution with a reasonable computing time. Furthermore, validation of the resultant set of parameters for different system conditions is presented. Finally, IBG with optimized fault recovery controllers is integrated into a simplified real-world power system, and the applicability of the proposed optimized controllers is illustrated.https://ieeexplore.ieee.org/document/9774378/Energy storagefault recoveryfrequency scanningIBGinertia emulationinverter controls |
| spellingShingle | Thilini Hathiyaldeniye Chandana Karawita Bagen Bagen Nalin Pahalawaththa Udaya D. Annakkage Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids IEEE Open Access Journal of Power and Energy Energy storage fault recovery frequency scanning IBG inertia emulation inverter controls |
| title | Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids |
| title_full | Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids |
| title_fullStr | Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids |
| title_full_unstemmed | Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids |
| title_short | Optimal Controllers to Improve Transient Recovery of Grid-Following Inverters Connected to Weak Power Grids |
| title_sort | optimal controllers to improve transient recovery of grid following inverters connected to weak power grids |
| topic | Energy storage fault recovery frequency scanning IBG inertia emulation inverter controls |
| url | https://ieeexplore.ieee.org/document/9774378/ |
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