Full
Outline
Owing to its advantages of good controllability, high efficiency and reliability, and adaptability to the connection of renewable energy resources, the direct current (DC) distribution system has become the development direction of next-generation power distribution systems. The characteristics of energy resources and loads, disturbance resources, and operation mechanism of DC distribution networks are different from those of alternating current (AC) distribution networks, which lead to new features of power quality issues. Aimed at the widespread applications of DC distribution systems, their typical topologies with the corresponding grounding modes are introduced. With the combination of operation characteristics, the phenomena of various possible power quality issues in DC distribution systems are analyzed, including voltage band, ripples, imbalance, flicker, voltage dip (short-time interruption) and voltage swell. In addition, the main technical indices that can be used to describe the power quality of DC distribution systems are proposed. The results of an example demonstrate that these indices can well quantitate the related power quality phenomena. Finally, the research directions for power quality issues in DC distribution systems in the future are also discussed. The research aims to analyze the power quality issues in DC distribution systems in depth, providing support for the comprehensive power quality measurement and analysis of DC distribution systems.
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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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