Most of the countries in the world have a futuristic vision of generating at least 33% of total installed generation capacity from the renewable sources like wind, solar etc. by 2020. As part of the vision, one of the key steps that are being taken is to integrate residential micro grids in large scale at low voltage distribution level. In this paper, we propose a novel and unique algorithm to effectively monitor and control the residential micro grids (MG) connected to low voltage radial distribution systems. An Advanced Metering Infrastructure (AMI) & Geographical Information System (GIS) based near real-time load flow method is developed for this purpose. Proposed method along with weighted graph representation of each 1-phase network connected to a 3-phase distribution transformer (DT) helps in real-time monitoring & control of residential micro grids at individual DT level. A case study is performed on standard IEEE 33 bus radial system demonstrating the working method of proposed algorithm and its major applications for distribution system automation & control are discussed. © 2019 Elsevier Ltd