Protection and control of microgrids

在环境和经济考虑的推动下，连接到低压和中压配电系统的分布式能源（DER），包括分布式发电（DG）和储能（ES）正在迅速增加。小型可再生能源和热电联产系统的大规模整合可以显著减少排放。分布式电源的引入使配电系统从早期的无源状态转变为有源网络。然而，目前的做法是在失去主电源的情况下断开分布式发电。由于DG的渗透程度很高，频繁关闭DG可能会导致经济、社会和技术问题。微电网的概念可能是解决上述许多问题的一个有价值的选择。

Driven by the environmental and economic considerations, Distributed Energy Resources (DER), which includes Distributed Generation (DG) and Energy Storage (ES), connected to low and medium voltage distribution systems is rapidly increasing. Large-scale integration of small renewable energy and co-generation system could yield significant emission reductions. Introduction of DER has significantly changed the power distribution system from its early passive state to an active network. However, current practice is to disconnect the distributed generation at the loss of the main supply. With high penetration levels of DG, frequent switching-off of DGs may lead to economical, social and technical problems. The concept of microgrids can be a valuable option to address many of the above issues.