Unified power quality conditioners Projects

Unified power quality conditioners projects list

Unified power quality conditioners (UPQCs) consist of combined series and shunt active power filters (APFs) for simultaneous compensation of voltage and current disturbances and reactive power. They are applicable to power distribution systems, being connected at the point of common coupling (PCC) of loads that generate harmonic currents.

The series APF must compensate the source voltage disturbances, such as harmonics, dips or over-voltages, which might deteriorate the operation of the local load while the shunt APF attenuates the undesirable load current components (harmonic currents and the fundamental frequency component which contributes to the reactive load power). Moreover, the shunt APF must control the dc-bus voltage in order to ensure the compensation capability of the UPQC.

These functionalities can be carried out by applying diverse control strategies which can operate in the time domain, in the frequency domain or both. Time domain methods, such as pq or dq based methods, allow the fast compensation of time-variant disturbances but make more complex their selective compensation. In this sense, frequency domain methods are more flexible but their dynamical response is slower.

Unified power quality conditioners

Unified power quality conditioners

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