含T接逆变型分布式电源配电网的自适应距离保护OACSTPCD

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 T-connected 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 communica-tion system is reduced.Finally,the 10 kV distribution network model with T-connected IIDG is established in MATLAB,and compared with the traditional distance protection to verify the superiority of this protection method.