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The IUP Journal of Electrical and Electronics Engineering:
Reactive Power Compensation Through Unified Power Quality Conditioner: A Review
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Wide applications of power electronic-based loads have increased the power quality problems. Power quality is an issue at the distribution level due to the nonlinear behavior of the power electronic-based loads. Among the various compensating devices, Unified Power Quality Conditioner (UPQC) is an active power conditioning device used to compensate both harmonics and reactive power. UPQC is designed to lessen voltage and current quality problems, including those resulting from single-phase faults. UPQC for active and reactive power compensation has different control strategies. A three-phase UPQC with cross-phase connection, the behavior of UPQC with sudden switching of R-L loads and the occurrence of different shunt faults are analyzed. Control strategy for cross-phase connected UPQC is capable of compensating load terminal voltage and load current effectively.

 
 

In the last few decades, demand for power has increased while the power generation and transmission are limited due to limited sources and environmental issues. Hence, power quality is a very important term related to amplitude, phase and frequency of the voltage and current both at the generation and distribution levels (Gupta and Singhal, 2010). Any problem in voltage, current and frequency results in the failure of the equipment/system and is known as power quality problem (Shembekar et al., 2015). Power quality is becoming an important issue at the distribution level. The power electronic devices have nonlinear characteristics which have two important limitations: they draw lagging current and generate harmonics (Shankar et al., 2011). The shunt active filter is connected across the loads to compensate current-related issues such as reactive power compensation, improvement in power factor, and harmonic compensation, whereas series active filter is connected in series with the line to compensate voltage-related problems such as voltage sag/swell, voltage flickers and harmonics (Teke et al., 2011). A UPQC is relatively a member of the custom power device family and the combination of shunt active filter and series active filter. The UPQC was first introduced in 1996. UPQC is also known as universal power quality conditioner or universal active filter (Teke et al., 2011). Any power quality issue can be tackled with this device. Among the various FACTS devices (Padiyar, 2007), the UPQC is used to enhance the steady state stability, dynamic stability and transient stability of the system (Shembekar et al., 2015). UPQC is a universal active power conditioning device used to compensate both harmonics and reactive power. It is the modern and PQ improving device (Shankar et al., 2011). Generally, power quality problems arise because of supply voltage distortion or load current disturbances. Since UPQC has both series and shunt compensators, it can handle both supply voltage and load current issues simultaneously when connected at the point of common coupling.

 
 
 

Electrical and Electronics Engineering Journal, Power quality, Unified Power Quality Conditioner (UPQC)