Power Quality Improvement by UPQC in a Distribution Network using a Novel SRF based Control Approach

In this paper an updated technique has been discussed to mitigate several kinds of power quality (PQ) problems to a distribution network which is connected with a unified power quality conditioner (UPQC). This UPQC is also considered to be connected with an unbalanced as well as distorted non-linear type of load. The harmonic distortions reduction and voltage profile fluctuations reduction can also be executed with the help of UPQC device connected to a distribution network. The principal formation of a UPQC can be represented as the simultaneous operation of two different kinds of active power filters (APF). These two filters are also named based on their connection as series active power filter (SAPF) and shunt active power filter (SHAPF) and they are used to mitigate the voltage and current related several PQ issues respectively. The SRF and d-q-0 concept based control strategies are utilized for series and also for the shunt connected APF of UPQC. The SRF and d-q-0 concepts have been utilized for the UPQC modelling using MATLAB software. The model is then simulated and the simulation results are discussed and analyzed.