Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent
The short-circuit ratio is a key index used to measure the voltage support capability of new energy grid-connected systems, which contradicts its accuracy and practicability. The current short-circuit ratio index (SCR-U) does not consider the influence of the coupling impedance between power supply...
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MDPI AG
2025-05-01
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| author | Li Sun Lingwei Kong |
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| description | The short-circuit ratio is a key index used to measure the voltage support capability of new energy grid-connected systems, which contradicts its accuracy and practicability. The current short-circuit ratio index (SCR-U) does not consider the influence of the coupling impedance between power supply and load on the short-circuit ratio in the calculation process. This paper derives the coupled short-circuit ratio (SCR-O) based on SCR-U and the coupled equivalent impedance. The coupled critical short-circuit ratio (CSCR-O) is then numerically obtained based on the maximum transmission power, and the extreme value of the critical short-circuit ratio is calculated to provide a numerical basis to determine the accuracy of SCR-U and SCR-O. Finally, simulations demonstrate the superiority of the coupling short circuit to the short-circuit ratio index. It can provide more accurate results and reflect the system’s real-time voltage stability. |
| format | Article |
| id | doaj-art-b8c6f52242754eadbf9a3c8fb2f63746 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-b8c6f52242754eadbf9a3c8fb2f637462025-08-20T01:56:19ZengMDPI AGEnergies1996-10732025-05-011810255410.3390/en18102554Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin EquivalentLi Sun0Lingwei Kong1Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, ChinaKey Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin 132012, ChinaThe short-circuit ratio is a key index used to measure the voltage support capability of new energy grid-connected systems, which contradicts its accuracy and practicability. The current short-circuit ratio index (SCR-U) does not consider the influence of the coupling impedance between power supply and load on the short-circuit ratio in the calculation process. This paper derives the coupled short-circuit ratio (SCR-O) based on SCR-U and the coupled equivalent impedance. The coupled critical short-circuit ratio (CSCR-O) is then numerically obtained based on the maximum transmission power, and the extreme value of the critical short-circuit ratio is calculated to provide a numerical basis to determine the accuracy of SCR-U and SCR-O. Finally, simulations demonstrate the superiority of the coupling short circuit to the short-circuit ratio index. It can provide more accurate results and reflect the system’s real-time voltage stability.https://www.mdpi.com/1996-1073/18/10/2554Thevenin equivalentcoupled short-circuit ratiocoupling critical short-circuit ratiostatic voltage |
| spellingShingle | Li Sun Lingwei Kong Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent Energies Thevenin equivalent coupled short-circuit ratio coupling critical short-circuit ratio static voltage |
| title | Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent |
| title_full | Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent |
| title_fullStr | Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent |
| title_full_unstemmed | Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent |
| title_short | Coupling Short-Circuit Ratio Calculation Method Based on the Source Network Load Correlation Thevenin Equivalent |
| title_sort | coupling short circuit ratio calculation method based on the source network load correlation thevenin equivalent |
| topic | Thevenin equivalent coupled short-circuit ratio coupling critical short-circuit ratio static voltage |
| url | https://www.mdpi.com/1996-1073/18/10/2554 |
| work_keys_str_mv | AT lisun couplingshortcircuitratiocalculationmethodbasedonthesourcenetworkloadcorrelationtheveninequivalent AT lingweikong couplingshortcircuitratiocalculationmethodbasedonthesourcenetworkloadcorrelationtheveninequivalent |