Hierarchical under frequency load shedding scheme for inter-connected power systems
Abstract Severe disturbances in a power network can cause the system frequency to exceed the safe operating range. As the last defensive line for system emergency control, under frequency load shedding (UFLS) is an important method for preventing a wide range of frequency excursions. This paper prop...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-07-01
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| Series: | Protection and Control of Modern Power Systems |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s41601-023-00307-9 |
| _version_ | 1797774136655740928 |
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| author | Guowei Cai Shuyu Zhou Cheng Liu Yuchi Zhang Shujia Guo Zhichong Cao |
| author_facet | Guowei Cai Shuyu Zhou Cheng Liu Yuchi Zhang Shujia Guo Zhichong Cao |
| author_sort | Guowei Cai |
| collection | DOAJ |
| description | Abstract Severe disturbances in a power network can cause the system frequency to exceed the safe operating range. As the last defensive line for system emergency control, under frequency load shedding (UFLS) is an important method for preventing a wide range of frequency excursions. This paper proposes a hierarchical UFLS scheme of “centralized real-time decision-making and decentralized real-time control” for inter-connected systems. The centralized decision-layer of the scheme takes into account the importance of the load based on the equivalent transformation of kinetic energy (KE) and potential energy (PE) in the transient energy function (TEF), while the load PE is used to determine the load shedding amount (LSA) allocation in different loads after faults in real-time. At the same time, the influence of inertia loss is considered in the calculation of unbalanced power, and the decentralized control center is used to implement the one-stage UFLS process to compensate for the unbalanced power. Simulations are carried out on the modified New England 10-generator 39-bus system and 197-bus system in China to verify the performance of the proposed scheme. The results show that, compared with other LSA allocation indicators, the proposed allocation indicators can achieve better f nadir and t d . At the same time, compared with other multi-stage UFLS schemes, the proposed scheme can obtain the maximum f nadir with a smaller LSA in scenarios with high renewable energy sources (RES) penetration. |
| first_indexed | 2024-03-12T22:15:39Z |
| format | Article |
| id | doaj.art-2619ca8417994525bf4f10cd64537263 |
| institution | Directory Open Access Journal |
| issn | 2367-2617 2367-0983 |
| language | English |
| last_indexed | 2024-03-12T22:15:39Z |
| publishDate | 2023-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Protection and Control of Modern Power Systems |
| spelling | doaj.art-2619ca8417994525bf4f10cd645372632023-07-23T11:17:29ZengSpringerOpenProtection and Control of Modern Power Systems2367-26172367-09832023-07-018111210.1186/s41601-023-00307-9Hierarchical under frequency load shedding scheme for inter-connected power systemsGuowei Cai0Shuyu Zhou1Cheng Liu2Yuchi Zhang3Shujia Guo4Zhichong Cao5School of Electrical Engineering, Northeast Electrical Power UniversitySchool of Electrical Engineering, Northeast Electrical Power UniversitySchool of Electrical Engineering, Northeast Electrical Power UniversitySchool of Electrical Engineering, Northeast Electrical Power UniversitySchool of Electrical Engineering, Northeast Electrical Power UniversitySchool of Electrical Engineering, Northeast Electrical Power UniversityAbstract Severe disturbances in a power network can cause the system frequency to exceed the safe operating range. As the last defensive line for system emergency control, under frequency load shedding (UFLS) is an important method for preventing a wide range of frequency excursions. This paper proposes a hierarchical UFLS scheme of “centralized real-time decision-making and decentralized real-time control” for inter-connected systems. The centralized decision-layer of the scheme takes into account the importance of the load based on the equivalent transformation of kinetic energy (KE) and potential energy (PE) in the transient energy function (TEF), while the load PE is used to determine the load shedding amount (LSA) allocation in different loads after faults in real-time. At the same time, the influence of inertia loss is considered in the calculation of unbalanced power, and the decentralized control center is used to implement the one-stage UFLS process to compensate for the unbalanced power. Simulations are carried out on the modified New England 10-generator 39-bus system and 197-bus system in China to verify the performance of the proposed scheme. The results show that, compared with other LSA allocation indicators, the proposed allocation indicators can achieve better f nadir and t d . At the same time, compared with other multi-stage UFLS schemes, the proposed scheme can obtain the maximum f nadir with a smaller LSA in scenarios with high renewable energy sources (RES) penetration.https://doi.org/10.1186/s41601-023-00307-9Hierarchical under frequency load sheddingCentralized real-time decision-making and decentralized real-time controlTransient energy functionKinetic energyPotential energy |
| spellingShingle | Guowei Cai Shuyu Zhou Cheng Liu Yuchi Zhang Shujia Guo Zhichong Cao Hierarchical under frequency load shedding scheme for inter-connected power systems Protection and Control of Modern Power Systems Hierarchical under frequency load shedding Centralized real-time decision-making and decentralized real-time control Transient energy function Kinetic energy Potential energy |
| title | Hierarchical under frequency load shedding scheme for inter-connected power systems |
| title_full | Hierarchical under frequency load shedding scheme for inter-connected power systems |
| title_fullStr | Hierarchical under frequency load shedding scheme for inter-connected power systems |
| title_full_unstemmed | Hierarchical under frequency load shedding scheme for inter-connected power systems |
| title_short | Hierarchical under frequency load shedding scheme for inter-connected power systems |
| title_sort | hierarchical under frequency load shedding scheme for inter connected power systems |
| topic | Hierarchical under frequency load shedding Centralized real-time decision-making and decentralized real-time control Transient energy function Kinetic energy Potential energy |
| url | https://doi.org/10.1186/s41601-023-00307-9 |
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