Abstract
This paper deals with the performance of unified power quality conditioner (UPQC) based on current source converter (CSC) topology. UPQC is used to mitigate the power quality problems like harmonics and sag. The shunt and series active filter performs the simultaneous elimination of current and voltage problems. The power fed is linked through common DC link and maintains constant real power exchange. The DC link is connected through the reactor. The real power supply is given by the photovoltaic system for the compensation of power quality problems. The reference current and voltage generation for shunt and series converter is based on phase locked loop and synchronous reference frame theory. The proposed UPQC-CSC design has superior performance for mitigating the power quality problems.
Highlights
The main impact in the power distribution system is the quality of power, which causes more distortion in the source due to using nonlinear loads
In order to overcome the drawbacks of passive filter, for the elimination of power quality problems, active filters were used
The unified power quality conditioner (UPQC)-current source converter (CSC) has the reactor as the DC link for the series and shunt converter and is controlled by the synchronous reference frame (SRF) theory and the pulse is generated by the hysteresis band controller
Summary
The main impact in the power distribution system is the quality of power, which causes more distortion in the source due to using nonlinear loads (power electronics loads). The series and shunt active power filters are voltage and current source converters which are controlled by the PWM signals which are generated by the controllers. The control strategy for the unified power quality conditioner is based on the synchronous reference frame (SRF) [8, 9] theory. In this theory controlling of the three-phase converters using the rotating frame theory by converting the source voltage and current to direct and quadrature axis is done. The series controller gets the reference signal for the generation of pulse for the three-phase converter, by comparing the source voltage with distortion and constant voltage.
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