System strength is an important concept in the integration of renewable energy sources (RESs). However, evaluating system strength is becoming more ambiguous due to the interaction of RESs. This paper proposes a novel scheme to define the actual interaction boundaries of RESs using the power flow tracing strategy. Based on the proposed method, the interaction boundaries of RESs were identified at the southwest side of Korea Electric Power Corporation (KEPCO) systems. The test results show that the proposed approach always provides the identical interaction boundaries of RESs in KEPCO systems, compared to the Electric Reliability Council of Texas (ERCOT) method. The consistent boundaries could be a guideline for power-system planners to assess more accurate system strength, considering the actual interactions of the RESs.
Bibliographical noteFunding Information:
Acknowledgments: This work was supported by an NRF (National Research Foundation of Korea) Grant funded by the Korean Government (NRF-2019H1A2A1075987—Global Ph.D. Fellowship Program), and by the Korea Electric Power Corporation (Grant number: R17XA05-04).
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
- Interaction boundary
- Renewable energy sources
- Short-circuit ratio
- System strength
- Weighted short-circuit ratio
ASJC Scopus subject areas
- Geography, Planning and Development
- Renewable Energy, Sustainability and the Environment
- Environmental Science (miscellaneous)
- Energy Engineering and Power Technology
- Management, Monitoring, Policy and Law