Özet:

In this paper, a new algorithm has been introduced to regulate the DC capacitor voltage in single phase shunt active power filters to supply converter losses over the grid. In the system, the DC busbar voltage cannot be kept stable due to converter losses. The variation in DC busbar voltage decreases the power supplied by an active power filter. Conventionally, the voltage of a DC capacitor is regulated with a PI controller to overcome this problem. In this study, a new algorithm has been introduced to compensate for converter losses in the grid. According to this algorithm, converter losses are calculated by comparing the real average active power and the reference average active power of the converter at the fundamental frequency. The power losses calculated have been added to average active power of the load and then the power losses consumed by converter have been supplied from the grid. The executed simulation results demonstrate the simplicity, effectiveness and low cost of the new algorithm.  Key Words: Shunt active filter, Harmonics, DC voltage control.  

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