Unified Power Quality Conditioner

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Unified power quality conditioners (UPQCs) allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power. It aims at the integration of series-active and shunt-active power filters. The main purpose of a UPQC is to compensate for voltage imbalance, reactive power, negative sequence current and harmonics.

Major components of Unified power quality conditioner are Power Source, Shunt Active Filer and Load. 

Shunt Active Filter

Unified power quality conditioners

Major components of Shunt Active Filer are Consists of controller and inverter.

Control Strategy is based on instantaneous reactive power theory. The power quality theory consists of an algebraic transformation (Clarke transformation) of the three phase voltages and currents, followed by the calculation of the power quality theory instantaneous power components. The power components power and quality are related to the same alpha and beta voltages and currents, and can be written together. These quantities are illustrated for an electrical system represented in a-b-c coordinates.

Simulation of Unified power quality conditioner should be done in Matlab. Filter block control plays a big role in maintaining power quality. For more information on the Design and simulation of series active filter and Simulation of UPQC please fo through the attached presentation.

Attachments:
Download this file (UNIFIED POWER QUALITY CONDITIONER.ppt)Unified Power Quality Conditioner[PPT Presentation]446 Kb
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