A Single Phase DG Unit With Shunt APF Capability By Adaptive Neural Filtering

The energy demands are increasing day by day and the associated costs also increasing with demand. Newer energy alternatives such as distributed generation (DG) has become an attractive method for providing electricity to consumers. But,increased use of power electronics devices in distribution systems causes problems related to power quality such as harmonics. In this situation,a single-phase distributed generation (DG) system with active power ltering (APF) capability, helps a lot in utility current harmonic compensation. With the proposed approach, control of DG unit is performed by injecting current into the grid with same phase and frequency of the grid voltage and with an amplitude depending on the power available from renewable sources. On the other hand, load harmonic current compensation is performed by injecting alternating current into the system with an opposite phase. Both, detection of the grid voltage fundamental and computation of the load harmonic compensation current have been performed by two neural adaptive lters with the same structure - notch and band con gurations. The notch lter has been used to compute the compensation current by eliminating only the contribution of fundamental load current, whereas the band con guration is able to extract the fundamental of the coupling point voltage. Furthermore, current control of components at di erent frequencies,is done with the help of a multi resonant current controller.

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