Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems
Power reserves are usually scheduled in day-ahead unit commitment (UC) to minimize operating costs while maintaining system security. In applying basic UC (bUC) after a contingency, the system frequency may fall upon the activation of the load-shedding global control (under-frequency load-shedding o...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-10-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/14/19/6290 |
| _version_ | 1797516613075861504 |
|---|---|
| author | David Rebollal Mónica Chinchilla David Santos-Martín Josep M. Guerrero |
| author_facet | David Rebollal Mónica Chinchilla David Santos-Martín Josep M. Guerrero |
| author_sort | David Rebollal |
| collection | DOAJ |
| description | Power reserves are usually scheduled in day-ahead unit commitment (UC) to minimize operating costs while maintaining system security. In applying basic UC (bUC) after a contingency, the system frequency may fall upon the activation of the load-shedding global control (under-frequency load-shedding or UFLS) limits. Small isolated microgrids are more sensitive to this issue due to their lack of inertia. Including dynamic considerations into the bUC problem can minimize UFLS activation and also avoid the need for the operator to later check the short-term feasibility of a bUC solution. These proposals are known as Frequency-Constrained UC (FCUC), although the implementation are very time-consuming. FCUC implementation will increase the system’s operational costs, which should be calculated to estimate remuneration to the safety service based on the additional reserve provision. The electrical system of Gran Canaria island has suffered several episodes of greater blackouts in recent years. Shortly, there will be 242 MW of wind generation installed (26% of the thermal power installed on Gran Canaria). The main objective of this work is to improve the island system reliability by means of an FCUC formulation applied by the system operator in practice, including renewable sources. The results show that the frequency values remained within the admissible boundaries, but the system’s operational costs increased by around 13%. |
| first_indexed | 2024-03-10T07:03:19Z |
| format | Article |
| id | doaj.art-ea1142dd2814441dbf0982a690176fee |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T07:03:19Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-ea1142dd2814441dbf0982a690176fee2023-11-22T16:02:10ZengMDPI AGEnergies1996-10732021-10-011419629010.3390/en14196290Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid SystemsDavid Rebollal0Mónica Chinchilla1David Santos-Martín2Josep M. Guerrero3Department of Electrical Engineering, University Carlos III of Madrid (UC3M), Avda. De la Universidad 30, Leganés, 28911 Madrid, SpainDepartment of Electrical Engineering, University Carlos III of Madrid (UC3M), Avda. De la Universidad 30, Leganés, 28911 Madrid, SpainDepartment of Electrical Engineering, University Carlos III of Madrid (UC3M), Avda. De la Universidad 30, Leganés, 28911 Madrid, SpainCenter for Research on Microgrids (CROM), AAU Energy, Aalborg University, 9220 Aalborg East, DenmarkPower reserves are usually scheduled in day-ahead unit commitment (UC) to minimize operating costs while maintaining system security. In applying basic UC (bUC) after a contingency, the system frequency may fall upon the activation of the load-shedding global control (under-frequency load-shedding or UFLS) limits. Small isolated microgrids are more sensitive to this issue due to their lack of inertia. Including dynamic considerations into the bUC problem can minimize UFLS activation and also avoid the need for the operator to later check the short-term feasibility of a bUC solution. These proposals are known as Frequency-Constrained UC (FCUC), although the implementation are very time-consuming. FCUC implementation will increase the system’s operational costs, which should be calculated to estimate remuneration to the safety service based on the additional reserve provision. The electrical system of Gran Canaria island has suffered several episodes of greater blackouts in recent years. Shortly, there will be 242 MW of wind generation installed (26% of the thermal power installed on Gran Canaria). The main objective of this work is to improve the island system reliability by means of an FCUC formulation applied by the system operator in practice, including renewable sources. The results show that the frequency values remained within the admissible boundaries, but the system’s operational costs increased by around 13%.https://www.mdpi.com/1996-1073/14/19/6290frequency-constrained unit commitmentoperating costsreserve allocationinertiaislanded microgrids |
| spellingShingle | David Rebollal Mónica Chinchilla David Santos-Martín Josep M. Guerrero Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems Energies frequency-constrained unit commitment operating costs reserve allocation inertia islanded microgrids |
| title | Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems |
| title_full | Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems |
| title_fullStr | Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems |
| title_full_unstemmed | Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems |
| title_short | Endogenous Approach of a Frequency-Constrained Unit Commitment in Islanded Microgrid Systems |
| title_sort | endogenous approach of a frequency constrained unit commitment in islanded microgrid systems |
| topic | frequency-constrained unit commitment operating costs reserve allocation inertia islanded microgrids |
| url | https://www.mdpi.com/1996-1073/14/19/6290 |
| work_keys_str_mv | AT davidrebollal endogenousapproachofafrequencyconstrainedunitcommitmentinislandedmicrogridsystems AT monicachinchilla endogenousapproachofafrequencyconstrainedunitcommitmentinislandedmicrogridsystems AT davidsantosmartin endogenousapproachofafrequencyconstrainedunitcommitmentinislandedmicrogridsystems AT josepmguerrero endogenousapproachofafrequencyconstrainedunitcommitmentinislandedmicrogridsystems |