Applying analysis of power quality enhancement by using UPQC

The current power sector is dealing with the weak power quality issues and the main reasons hiding behind the weak power quality are harmonics, fluctuations of voltage, transients and reactive power consume. These problems are caused by arising trends in our consume. Nowadays, the share of supply from power electronic devices has greatly increased among our consume. Coupling of the grid to a symbiosis of wind farms and PV parks has also raised matter of weak power quality. There is no doubt that shunt and series compensation is efficient but if they are utilized as a single unit simultaneously, this will increase the efficiency of the device and become a greater beneficiary of the power sector, which together serve as UPQC (Unified Power Quality Conditioner). Therefore, to improve the power quality is the main task of UPQC and through compensation to the above problems proves that it has considerable advantages in improving power quality. So UPQC is considered to be an effective method to solve power quality problems. Since UPQC is used for both shunt and series compensators, it contains two inverters to provide this service. They are voltage source inverters with a common DC link, which are called shunt and series converters. These controllers can be controlled by various techniques such as PI controllers, Fuzzy controllers, Neural Networks etc. The series converter is in charge of the smoothing of the voltage, and the shunt converter compensates for the distorted load current. (paper)