A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication
In non-synchronous machine sources (N-SMSs), power sources are connected to the grid through power electronic devices, which typically exhibit a voltage-controlled current source characteristic during faults. Due to the current-limiting feature of inverters, the voltage and current demonstrate a str...
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MDPI AG
2025-02-01
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| Series: | Electricity |
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| Online Access: | https://www.mdpi.com/2673-4826/6/1/7 |
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| author | Jianhua Li Jianyu Lu Po Li Ying Huang Guoteng Wang |
| author_facet | Jianhua Li Jianyu Lu Po Li Ying Huang Guoteng Wang |
| author_sort | Jianhua Li |
| collection | DOAJ |
| description | In non-synchronous machine sources (N-SMSs), power sources are connected to the grid through power electronic devices, which typically exhibit a voltage-controlled current source characteristic during faults. Due to the current-limiting feature of inverters, the voltage and current demonstrate a strong nonlinearity. As a result, the short-circuit current (SCC) of N-SMSs is commonly calculated using iterative methods. For renewable energy plants, which contain a large number of N-SMSs, the calculation is often based on the single-machine multiplication method, ignoring internal discrepancies among machines. To address these issues, this paper proposes a calculation method for the SCC contributed by a renewable energy plant based on single-machine multiplication. This method is simple, does not require iteration, and ensures engineering practicability. This paper first analyzes the SCC calculation model under a low-voltage ride-through (LVRT) control strategy. Inspired by the single-machine multiplication approach, a fast initial voltage calculation method at the machine terminal is proposed, along with an active current correction method. With this approach, a more accurate SCC can be obtained, avoiding convergence issues and ensuring practical applicability in engineering. The validity of this method is verified through PSCAD/EMTDC simulations. The error in calculating SCC does not exceed 3.02%. Compared with the single-machine multiplication method, the accuracy is significantly improved, while the accuracy is roughly equivalent to that of the iterative method. |
| format | Article |
| id | doaj-art-23a49f4523be470c8caa70079ad23c8e |
| institution | DOAJ |
| issn | 2673-4826 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electricity |
| spelling | doaj-art-23a49f4523be470c8caa70079ad23c8e2025-08-20T02:42:48ZengMDPI AGElectricity2673-48262025-02-0161710.3390/electricity6010007A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine MultiplicationJianhua Li0Jianyu Lu1Po Li2Ying Huang3Guoteng Wang4China East Branch of State Grid Corporation of China, Shanghai 200120, ChinaChina East Branch of State Grid Corporation of China, Shanghai 200120, ChinaCollege of Electrical Engineering, Zhejiang University, Hangzhou 310027, ChinaCollege of Electrical Engineering, Zhejiang University, Hangzhou 310027, ChinaCollege of Electrical Engineering, Zhejiang University, Hangzhou 310027, ChinaIn non-synchronous machine sources (N-SMSs), power sources are connected to the grid through power electronic devices, which typically exhibit a voltage-controlled current source characteristic during faults. Due to the current-limiting feature of inverters, the voltage and current demonstrate a strong nonlinearity. As a result, the short-circuit current (SCC) of N-SMSs is commonly calculated using iterative methods. For renewable energy plants, which contain a large number of N-SMSs, the calculation is often based on the single-machine multiplication method, ignoring internal discrepancies among machines. To address these issues, this paper proposes a calculation method for the SCC contributed by a renewable energy plant based on single-machine multiplication. This method is simple, does not require iteration, and ensures engineering practicability. This paper first analyzes the SCC calculation model under a low-voltage ride-through (LVRT) control strategy. Inspired by the single-machine multiplication approach, a fast initial voltage calculation method at the machine terminal is proposed, along with an active current correction method. With this approach, a more accurate SCC can be obtained, avoiding convergence issues and ensuring practical applicability in engineering. The validity of this method is verified through PSCAD/EMTDC simulations. The error in calculating SCC does not exceed 3.02%. Compared with the single-machine multiplication method, the accuracy is significantly improved, while the accuracy is roughly equivalent to that of the iterative method.https://www.mdpi.com/2673-4826/6/1/7low-voltage ride-throughshort-circuit currentinverterrenewable energy plantssingle-machine multiplication |
| spellingShingle | Jianhua Li Jianyu Lu Po Li Ying Huang Guoteng Wang A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication Electricity low-voltage ride-through short-circuit current inverter renewable energy plants single-machine multiplication |
| title | A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication |
| title_full | A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication |
| title_fullStr | A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication |
| title_full_unstemmed | A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication |
| title_short | A Practical Short-Circuit Current Calculation Method for Renewable Energy Plants Based on Single-Machine Multiplication |
| title_sort | practical short circuit current calculation method for renewable energy plants based on single machine multiplication |
| topic | low-voltage ride-through short-circuit current inverter renewable energy plants single-machine multiplication |
| url | https://www.mdpi.com/2673-4826/6/1/7 |
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