The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes
The ultra-low frequency oscillation (ULFO) problem reappears in China recently. Different from the classical low frequency oscillation (LFO), the generators in ULFO have the same mode shapes, namely oscillating in the same pace. To reveal the reason why ULFO generators do not oscillate inversely as...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9210059/ |
| _version_ | 1818431210128408576 |
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| author | Peng Wang Baohong Li Jingbo Zhao Tianqi Liu Qin Jiang Gang Chen |
| author_facet | Peng Wang Baohong Li Jingbo Zhao Tianqi Liu Qin Jiang Gang Chen |
| author_sort | Peng Wang |
| collection | DOAJ |
| description | The ultra-low frequency oscillation (ULFO) problem reappears in China recently. Different from the classical low frequency oscillation (LFO), the generators in ULFO have the same mode shapes, namely oscillating in the same pace. To reveal the reason why ULFO generators do not oscillate inversely as classical LFO does, this paper investigates the mechanism of ULFO based on improved Philips-Heffron model of two-machine system. Through this model, the phase angle relationship between different generators is obtained. Based on the bode diagram, it is found that the phase angle difference of the two machines is around zero in ultra-low frequency band however the generator parameters change. On the contrary, the situation is different in classical low frequency band, which reveals the mechanism that generators in ULFO always oscillate in the same pace. Finally, the analysis above is validated through a 2-area 4-machine system and a 6-machine system established in PSASP software. |
| first_indexed | 2024-12-14T15:45:41Z |
| format | Article |
| id | doaj.art-9a6db46c1a054d3588f7f1c117ea8656 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T15:45:41Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-9a6db46c1a054d3588f7f1c117ea86562022-12-21T22:55:31ZengIEEEIEEE Access2169-35362020-01-01819804719805710.1109/ACCESS.2020.30279709210059The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode ShapesPeng Wang0Baohong Li1https://orcid.org/0000-0001-8968-2690Jingbo Zhao2https://orcid.org/0000-0003-3447-3896Tianqi Liu3Qin Jiang4Gang Chen5https://orcid.org/0000-0003-3790-7602College of Electrical Engineering, Sichuan University, Chengdu, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu, ChinaState Grid Jiangsu Electric Power Company, Ltd., Research Institute, Nanjing, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu, ChinaDepartment of Power System, State Grid Sichuan Electric Power Research Institute, Chengdu, ChinaThe ultra-low frequency oscillation (ULFO) problem reappears in China recently. Different from the classical low frequency oscillation (LFO), the generators in ULFO have the same mode shapes, namely oscillating in the same pace. To reveal the reason why ULFO generators do not oscillate inversely as classical LFO does, this paper investigates the mechanism of ULFO based on improved Philips-Heffron model of two-machine system. Through this model, the phase angle relationship between different generators is obtained. Based on the bode diagram, it is found that the phase angle difference of the two machines is around zero in ultra-low frequency band however the generator parameters change. On the contrary, the situation is different in classical low frequency band, which reveals the mechanism that generators in ULFO always oscillate in the same pace. Finally, the analysis above is validated through a 2-area 4-machine system and a 6-machine system established in PSASP software.https://ieeexplore.ieee.org/document/9210059/Ultra-low frequency oscillationmode shapedynamic mechanism |
| spellingShingle | Peng Wang Baohong Li Jingbo Zhao Tianqi Liu Qin Jiang Gang Chen The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes IEEE Access Ultra-low frequency oscillation mode shape dynamic mechanism |
| title | The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes |
| title_full | The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes |
| title_fullStr | The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes |
| title_full_unstemmed | The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes |
| title_short | The Mechanism of Ultra-Low Frequency Oscillations With the Same Mode Shapes |
| title_sort | mechanism of ultra low frequency oscillations with the same mode shapes |
| topic | Ultra-low frequency oscillation mode shape dynamic mechanism |
| url | https://ieeexplore.ieee.org/document/9210059/ |
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