Power Quality Issues and Its Mitigation by Unified
Power Quality Conditioner
GRENZE International Journal of Engineering and Technology
J.P.Sridhar, R Prakash
The quality of electrical power plays vital role in the utility systems and industry.
The quality of the power tends to have a direct economic impact on consumers and
suppliers. Nowadays, standards and regulations are imposed to maintain the power quality
parameters at the Point of Common Coupling (PCC). Growing consumer demands lead to
power quality issues. Many consumers may experience severe technical and economic
impacts due to power quality problems such as voltage sag, swell, harmonics and voltage
interruptions. Therefore, the implementations of innovative and cost-effective compensation
techniques are needed.
Compensation methodology implemented by using high speed power electronic devices is an
effective solution for the power quality issues. A custom power device such as Unified
Power0 Quality Conditioner (UPQC) is one of the most versatile active power filter device
with the promising ability of improving the quality of voltage and current at the point of
installation in distribution and industrial power systems.The research work is primarily
concentrated on compensation of voltage sag, voltage swell, and harmonics. The proposed
UPQC system improves the power quality in power distribution systems using advance
control strategy. The proposed system is based on the instantaneous active power (p) and
reactive power (q) control theory. The control strategy of the UPQC system used in the
proposed work includes two parts, namely series control and parallel control.