基于控制网络的逆变器微电网继电保护方案

摘要

微电网作为一个集成大量分布式可再生能源的构建方法得到广泛的研究，微电网实施中面临的一个重要问题是设计合适的保护方案，微电网特性表明传统的保护方案无法应用于微电网。提出了使用智能继电器控制网络辅助的微电网保护方案，同时通过增加环路馈线进一步提高了微电网供电的可靠性。在不同的故障条件下，所设置的主和后备继电器能够执行其预定的保护功能，包括高阻抗故障检测保护。使用 Matlab-SimPowerSystems软件建立微电网系统模型，并验证保护方案的有效性。%Microgrids have been researched widely to integrate large numbers of distributed renewable energy sources. The proper protection is one of the key issues of microgrid safety, because traditional protection schemes can not be applied to the microgrid due to the specific characteristic of microgrid. A new protection scheme using intelligent relays with control network is proposed for the microgrid protection. An additional loop structure is explored to increase reliability. In all fault cases the primary and secondary relays are designed for their intended functions including the high impedance faults. The microgrid system modeling is established based on Matlab-SimPowerSystems, and the validity of the protection scheme is validated.