International Journal of Electronic and Electrical Engineering. ISSN 0974-2174 Volume 7, Number 7 (2014), pp. 723-733 © International Research Publication House http://www.irphouse.com Brief Review Paper on the Custom Power Devices for Power Quality Improvement Prafull A. Desale 1 , Vishvadeep J. Dhawale 2 and Ranjeet M. Bandgar 3 1, 2, 3 V.J.T.I. Mumbai, Maharashtra Abstract During Last decade power quality problems has become more complex at all level of power system. Recently, the Power electronics controllers are gaining concern to provide the quality of power for both power suppliers and consumers. Various power filtering technology i.e. passive filters, active power filters, hybrid filters have applied from time to time for giving the solution of power quality problems to users, But could not fully satisfied them. Now day’s a new concept of custom power is used for customers’ satisfaction. This paper present a comprehensive survey of custom power devises in distribution level. Keywords: Custom power, Distribution Static Compensator (DSTATCOM), Dynamic Voltage Restorer (DVR), Unified Power Quality Compensator (UPQC). Introduction Power quality problems have become important issues for electricity consumer sat all the level of usage. The deregulation of electric power energy has boosted the public awareness toward power quality among the different categories of users. The subject power quality and its problems related to electric power network has discussed in publications. To provide an active & flexible solution for power quality problems, various efforts have done from time to time. Among these power quality solution lossless passive filters consists of L-C tuned component have been widely used to suppress harmonic. Passive filters are advantageous as its initial cost is low and high efficiency. On the other hand it has various drawbacks of instability, fixed compensation, resonance with supply as well as loads and utility impedance. To overcome these limitations active power filters have been used .active power filter has various configurations: shunt, series and hybrid. Hybrid is the combination of series and shunt types. Shunt APF is used for compensating current based distortions while