| 引用本文: | Guowei Cai,Shuyu Zhou,Cheng Liu,等.[J].电力系统保护与控制,2023,(2):556-567.[点击复制] |
| Guowei Cai,Shuyu Zhou,Cheng Liu,et al.Hierarchical under frequency load shedding scheme for inter-connected power systems[J].Power System Protection and Control,2023,(2):556-567[点击复制] |
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| DOI：10.1186/s41601-023-00307-9 |
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| 基金项目:This work was supported in part by the National Key R&D Program of China
“Response-driven intelligent enhanced analysis and control for bulk power
system stability” under Grant 2021YFB2400800. |
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| Hierarchical under frequency load shedding scheme for inter-connected power systems |
| Guowei Cai,Shuyu Zhou,Cheng Liu,Yuchi Zhang,Shujia Guo,Zhichong Cao |
| () |
| 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 decisionlayer 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 diferent loads after faults in real-time. At the same time, the infuence
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 modifed 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 fnadir and td. At the same time, compared with other multi-stage UFLS schemes, the
proposed scheme can obtain the maximum fnadir with a smaller LSA in scenarios with high renewable energy sources
(RES) penetration. |
| Key words: Hierarchical under frequency load shedding, Centralized real-time decision-making and decentralized
real-time control, Transient energy function, Kinetic energy, Potential energy |
