With the continuous development of renewable energy, a large number of inverter interfaced distributed generations (IIDG) are connected to the distribution network, which puts forward new requirements for the traditional relay protection technology. In order to improve the power supply reliability of distribution network and adapt to the new power system with large penetration of renewable energy, an adaptive distance protection is proposed for distribution network with Tconnected IIDG. Firstly, the influence of fault at different locations on the protection is analyzed. According to the output characteristics of IIDG in case of system fault, the output current of IIDG is calculated by BP neural network using the local electrical information of the protection, and the action value is set immediately. Because this method does not need to communicate with the remote, the action speed is fast, and the investment of the communication system is reduced. Finally, the 10 kV distribution network model with Tconnected IIDG is established in MATLAB, and compared with the traditional distance protection to verify the superiority of this protection method.
| 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 |