The proliferation of Distributed Energy Resources (DERs) in the Distribution Network (DN) has affected the optimal operation of the grid due to multiple technical issues such as voltage rise, reverse power flow, voltage unbalance, islanding etc. Therefore, optimal management of DERs is becoming a key research area to improve the system power quality. In this context, several active network management schemes have been proposed to mitigate the issues associated with DERs integration into the grid and ultimately reduce the network power losses. This paper provides a comprehensive review of these schemes along with a discussion on the network modelling and load profiling. Further, it also reports the possible future research areas in the field of losses management.