含T接逆变型分布式电源配电网的自适应距离保护

Adaptive distance protection for distributed generation distribution network with T-connected inverter interfaced distributed generation

大量逆变型分布式电源(Inverter Interfaced Distributed Generation,IIDG)接入配电网,传统继电保护技术的可靠性无法满足。为了提高配电网供电可靠性,适应可再生能源大量渗透的新型电力系统,针对含T形接入IIDG的配电网,文章提出了一种自适应性的距离保护方案。分析了故障发生在不同位置对保护的影响,根据IIDG在系统发生故障时的输出特性,通过BP神经网络利用保护本地电气信息计算IIDG的输出电流,实时整定动作值。该方法由于无需与远方通信,动作速度快,并且减少了通信系统的投资。最后在MATLAB中建立了含T形接入IIDG的10 kV配电网模型,并与传统距离保护进行了对比,验证了该保护方法的优越性。

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 IDG is established in MATLAB,and compared with the traditional distance protection to verify the superiority of this protection method.