Full
Outline
With the continuous improvement of the degree of electronification in a power system, the proportion of harmonics in the system increases significantly. An accurate tracing of the source of harmonic disturbance is crucial for evaluating the influencing factors for power quality and providing important support for targeted control of harmonics. However, there are challenges in the large-scale harmonic tracing of power grids as follows. The sampling time of harmonic data of each power quality monitoring equipment is not synchronized, resulting in low time-domain accuracy and low effectiveness of the monitoring data. Through the calculation and analysis of the source tracing process, the amplification of errors will affect the quantitative results and source tracing effect. In a multi-harmonic source system, complex in multi-band impedance will affect the accurate traceability of a single disturbance source at a specific frequency. To solve the above problems, a harmonic state estimation method based on the time scale datum of different nodes is used to synchronously screen the monitoring data. With a focus on the complexity in the multi-band impedance characteristics, a multi-harmonic source tracing method based on multi-band impedance comparison at the same node is proposed. Through a comparison of the impedance results in multi-band at the same node, the potential harmonic source nodes can be effectively identified, and the harmonic force contribution of each node is calculated to quantitatively characterize its harmonic contribution. Finally, a simulation example of a multi-harmonic source power system including multiple new energy stations is established, and results fully verify the effectiveness of the proposed theoretical method.
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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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