Simulation and analysis of active power filters for power quality improvement in a distribution system

It is possible for a power system to experience various power quality (PQ) problems due to the application of Non-linear load (Man made cause) or fault, equipment failure (Natural cause). To overcome these non-linearities , power filters (PFs) are the best possible solutions .The main objective of this article is to mitigate different voltage and current based PQ issues such as voltage sag, swell, load unbalancing, power factor correction (PFC) etc by the implementation of series active PF (SAPF) and shunt active PF(ShAPF) respectively on a distribution system .A traditional control technique associated with Proportional integral (PI) controller is devised which minimizes the error between reference and actual value of the variables and gives required pulses for the operation of filters . The whole system along with PFs and its control techniques are simulated through MATLAB /SIMULINK and the results are also verified.