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Outline
In the context of a high-proportion of new energy integration into the distribution network, the interaction between a grid-connected converter and background disturbances increases the risk of harmonic resonance due to the emission of primary and secondary harmonics over a wide frequency band. Therefore, an indiscriminate risk-domain assessment method considering the severity of secondary harmonics and a temporal harmonic risk assessment method are proposed. First, based on the harmonic amplification factor, the severity indexes of harmonic amplification and secondary harmonics are defined, and the risk of harmonic resonance in all the nodes and branches of the distribution network across the entire frequency band is evaluated through indiscriminate sweep injection. Second, considering the temporal characteristics of actual harmonic sources and taking into account the superposition of primary and secondary harmonics, a risk level matrix containing three dimensions of over-limit probability, over-limit severity and continuous over-limit probability is constructed to quantify the temporal over-voltage and over-current risks of the distribution network. Finally, the feasibility of the proposed method was verified through a test case and an actual engineering case.
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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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