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Outline
The wind-thermal bundled outgoing system may cause sub-synchronous oscillation, while the inherent low-frequency oscillation of the thermal power unit and the interaction between its controller and sub-synchronous oscillation increase the difficulty in stability control. To solve this problem, a small-signal model of the system is established using the modular modeling idea at first, and the leading factors and participation modules of low-frequency and sub-synchronous oscillations are obtained by analyzing the eigenvalues and participation factors of the system oscillation modes, so as to determine the input signal and installation position of the controller. Then, the robust active disturbance rejection control (ADRC) technology is used to perform linearization, and a multi-channel and multi-frequency band doubly-fed wind farm linear ADRC (L-ADRC) additional damping controller is designed. Finally, considering the influence of the low-frequency oscillation additional damping controller on the damping of sub-synchronous frequency band, a coordinated suppression strategy for the multi-channel and multi-frequency band doubly-fed wind-thermal outgoing system based on an improved particle swarm optimization algorithm is put forward, which is verified by time-domain simulations. Results show that the designed control strategy has good suppression effect on low-frequency and sub-synchronous oscillation, and it also has good immunity and robustness.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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