Study on Three-Phase Four-Wire UPQC device for Power Quality Improvement
Sumaya Banu,  Dr. Sidheswar Prasad
The unified power quality conditioner [UPQC] is one of the advanced forms of custom devices, which consists of a hybrid series filter for compensating the voltage disturbances and a shunt active power filter for eliminating current distortions. This custom power device is mainly employed to overcome the power quality [PQ] problems by improving the quality of supply voltage and its waveforms, and to minimize present harmonic contents in nonlinear load currents in power distribution systems. In this paper, the configuration of UPQC, the designs of various components of UPQC, such as series and shunt active filter VSI parameters, the controllers, etc have been designed for simulation studies against nonlinear loads using MATLAB/ Simulink environments. The simulation studies on both conventional and modified topology of UPQC are presented, which have been carried out by considering a case example of voltage sag, swell, interruption, and harmonic distortions. From the simulation results on conventional and modified UPQC topology, it can be concluded that the modiﬁed topology has less average switching frequency, less THDs in load voltages and currents from the source. It has been also observed that the modified UPQC system gives reduced dc-link voltage than the conventional UPQC topology.
Keywords- Unified Power Quality Conditioner (UPQC), Distribution Static Compensator (DSTATCOM), Dynamic Voltage Restorer (DVR), Voltage Source Inverter (VSI), Total Harmonic Distortion (THD), dc-link Voltage, average switching frequency.
Cite this Article
Sumaya Banu,  Dr. Sidheswar Prasad,   " Study on Three-Phase Four-Wire UPQC device for Power Quality Improvement"
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.2, Issue 3, pp.3165-3176, Sept 2014, Available at :http://www.ijedr.org/papers/IJEDR1403058.pdf