Treffer: Experimental investigations on voltage sourced inverter interfaced photovoltaic based distributed generation system.

The voltage sourced-inverter (VSI) interfaced photovoltaic (PV) system with classic controller supplies the true power demand of the loads coupled at the Point of Interconnection (PoI). Thus, PV systems assets practically remain dormant at nighttime which reduces the device utilization factor of the VSI. Therefore, to subjugate the underutilization of VSI, this paper presents a synchronously rotating dq-frame and adaptive phase-locked loop (PLL) structure. The proposed system serves the following distinctive functions: (i) True power management function which is fundamentally responsible for sharing power requirement of the nonlinear load based on the renewable power accessibility at DC-link; and (ii) Active harmonic filtering (AHF) which is responsible for deliberately producing controlled harmonics in the output current and, in turn confronting the power quality (PQ) challenges. The envisaged control structure can be purposefully employed to transfer the power into the electric grid while providing grid current harmonic mitigation and balancing, reactive power elimination, and unity power factor (UPF) operation. In this respect, it is an inexpensive substitute to existing commercial shunt AHF meant for this job. The most distinctive feature of the presented structure is its computational effectiveness and easy implementation. Furthermore, insights are provided on the operating principle of a DC-link voltage control loop and power balance operation. The proposed PV system employs an incremental conductance (InC)-based technique to ensure optimal power evacuation from the PV arrays. Finally, the MATLAB/Simulink simulation and dSPACE-1104 based experimental results confirm the potential merits of the proposed structure to restrict the grid current distortions within the 5% and thereby complying with THD limit specified in the IEEE-519. [ABSTRACT FROM AUTHOR]

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