Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault
Taking a 1000 MW turbine generator as the research object, the short-circuit fault in electrical disturbance is analyzed. Since it is very difficult to carry out fault analysis experiments and research on actual systems, simulation analysis is one of the more effective means of electrical fault diag...
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| Format: | Article |
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MDPI AG
2021-10-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/19/9205 |
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| author | Honggang Pan Yunshi Wu Zhiyuan Pang Yanming Fu Tianyu Zhao |
| author_facet | Honggang Pan Yunshi Wu Zhiyuan Pang Yanming Fu Tianyu Zhao |
| author_sort | Honggang Pan |
| collection | DOAJ |
| description | Taking a 1000 MW turbine generator as the research object, the short-circuit fault in electrical disturbance is analyzed. Since it is very difficult to carry out fault analysis experiments and research on actual systems, simulation analysis is one of the more effective means of electrical fault diagnosis; the simulation’s results approach the actual behavior of the system and are ideal tools for power system analysis, and can provide an empirical basis for practical applications. The short-circuit fault model of the SIMULINK power system is built to analyze the two types of faults of generator terminals short-circuit and power grid short-circuit. The impact load spectrum, fault current and speed fluctuation between low-voltage rotors were extracted and analyzed. The conclusion is that the impact value of electromagnetic torque at the generator terminal is greater than that on the power grid side. The impact value of a two-phase short-circuit at the generator terminal is the largest, and that of a three-phase short-circuit on the power grid side is the smallest. The transient impulse current of a three-phase short-circuit at any fault point is greater than that of a two-phase short-circuit; the impulse current of the grid side short-circuit is much greater than that of the generator terminal short-circuit; the speed fluctuation and fluctuation difference caused by the three-phase short-circuit in the grid side are the largest. The alternating frequency of the transient electromagnetic force of the four kinds of faults avoids the natural frequency of the torsional vibration of the shaft system, and the torsional resonance of the shaft system in the time domain of the short-circuit fault will not appear. However, after the fault is removed, the residual small fluctuation torque in the system has a potential impact on the rotor system. This research shows an analysis of the structural integrity and safe operation of turbine generator units after a short-circuit fault, which can not only be applied to engineering practice, but also provide a theoretical basis for subsequent research. |
| first_indexed | 2024-03-10T07:05:47Z |
| format | Article |
| id | doaj.art-70c6c8ad16d04e63bd85c71fb55400e4 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:05:47Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-70c6c8ad16d04e63bd85c71fb55400e42023-11-22T15:49:19ZengMDPI AGApplied Sciences2076-34172021-10-011119920510.3390/app11199205Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit FaultHonggang Pan0Yunshi Wu1Zhiyuan Pang2Yanming Fu3Tianyu Zhao4School of Energy and Power, Shenyang Institute of Engineering, Shenyang 110136, ChinaSchool of Energy and Power, Shenyang Institute of Engineering, Shenyang 110136, ChinaLiaoning Dongke Electric Power Co., Ltd., Shenyang 110179, ChinaLaboratory Management Center, Shenyang Sport University, Shenyang 110102, ChinaSchool of Science, Northeastern University, Shenyang 110819, ChinaTaking a 1000 MW turbine generator as the research object, the short-circuit fault in electrical disturbance is analyzed. Since it is very difficult to carry out fault analysis experiments and research on actual systems, simulation analysis is one of the more effective means of electrical fault diagnosis; the simulation’s results approach the actual behavior of the system and are ideal tools for power system analysis, and can provide an empirical basis for practical applications. The short-circuit fault model of the SIMULINK power system is built to analyze the two types of faults of generator terminals short-circuit and power grid short-circuit. The impact load spectrum, fault current and speed fluctuation between low-voltage rotors were extracted and analyzed. The conclusion is that the impact value of electromagnetic torque at the generator terminal is greater than that on the power grid side. The impact value of a two-phase short-circuit at the generator terminal is the largest, and that of a three-phase short-circuit on the power grid side is the smallest. The transient impulse current of a three-phase short-circuit at any fault point is greater than that of a two-phase short-circuit; the impulse current of the grid side short-circuit is much greater than that of the generator terminal short-circuit; the speed fluctuation and fluctuation difference caused by the three-phase short-circuit in the grid side are the largest. The alternating frequency of the transient electromagnetic force of the four kinds of faults avoids the natural frequency of the torsional vibration of the shaft system, and the torsional resonance of the shaft system in the time domain of the short-circuit fault will not appear. However, after the fault is removed, the residual small fluctuation torque in the system has a potential impact on the rotor system. This research shows an analysis of the structural integrity and safe operation of turbine generator units after a short-circuit fault, which can not only be applied to engineering practice, but also provide a theoretical basis for subsequent research.https://www.mdpi.com/2076-3417/11/19/9205turbo-generator setelectrical short-circuitshafting torsional vibrationfault diagnosissimulation analysis |
| spellingShingle | Honggang Pan Yunshi Wu Zhiyuan Pang Yanming Fu Tianyu Zhao Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault Applied Sciences turbo-generator set electrical short-circuit shafting torsional vibration fault diagnosis simulation analysis |
| title | Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault |
| title_full | Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault |
| title_fullStr | Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault |
| title_full_unstemmed | Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault |
| title_short | Shafting Torsional Vibration Analysis of 1000 MW Unit under Electrical Short-Circuit Fault |
| title_sort | shafting torsional vibration analysis of 1000 mw unit under electrical short circuit fault |
| topic | turbo-generator set electrical short-circuit shafting torsional vibration fault diagnosis simulation analysis |
| url | https://www.mdpi.com/2076-3417/11/19/9205 |
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