Techniques for optimal placement of DG in radial distribution system: A review

Electricity market reconstituting relegates in power generation technologies and correspondence on the diminution of global greenhouse gas emission have paved the way for an increase in the use of generation. Holocene exploitation in the electric power and difficulty originate from construction and maintenance of large power plants have embossed a gravid deal of interest in distributed power generation. DG is one of the executable option for moderation of problem of load maturation, overloading of lines, timber of supply and reliability in term of exerting equipments maintenance intervals and to abbreviate line losses. Distributed generation is the technique where establishment of the power system as nearer as possible to the consumers and then compare it with the centralized power plants. But there are many difficulties and complexities in placement of DG in radial system, so to overcome these problems (i.e. active and reactive power loss, voltage profile, sizing and sitting of DG, reliability) researchers were used some biological (or) evolutionary algorithms( analytical method, numerical approach, meta-heuristic approach and hybrid approaches). These algorithms follow a strategy where design variables (location, size, type, no. of DG´s) and load variables (constant power, variable power) must be considered according to the requirement. These algorithms were tested on a various bus system. This paper presents a brief review of techniques proposed for optimal placement of DG in radial distribution system and those techniques has been shown there effective results.