Full
Outline
Synchronous compensator can effectively improve the oscillation problem caused by renewable energy connected to a weak grid, but most of the existing regulator modeling methods for oscillation analysis do not take into account the control role of the excitation regulator, which is not accurate enough when applied to the analysis of low-frequency power oscillations, resulting in the limited scope of application of the model. For this reason, a synchronous compensator impedance modeling method that takes into account the excitation response characteristics is proposed. Firstly, a general impedance model of synchronous machine is established. Then, the influence of the self-shunt static excitation system on the impedance characteristics of the compensator is analyzed, and the overall impedance model of the compensator is obtained by associating the excitation model with the synchronous machine model. Finally, the validity of the proposed method is verified by simulation cases, and the analytical results show that: the impedance of the compensator will peak near the industrial frequency (corresponding to low power frequency), and the excitation system will significantly reduce the peak impedance; the self-parallel static excitation system will significantly change the impedance around the power frequency, so that the impedance will be characterized by multiple peaks.
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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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