Recursive Least M-Estimate based Control Algorithm for Grid Interfaced Solar PV System

This paper deals with a single stage grid interfaced, multifunctional solar photovoltaic (PV) system for (1) feeding the solar PV array power into the grid with improved power quality (PQ) (2) supplying local nonlinear loads, (3) balancing the grid currents (4) providing the harmonics compensation and reactive power compensation. For achieving these functionalities, the voltage source converter of the PV system is controlled using the RLM (Recursive Least M-Estimate) based current control algorithm with FOAANF (Fourth Order Amplitude Adaptive Notch Filter) based voltage filter. This control algorithm makes the convergence of the control fast, and robust under impulsive noise environment, and unbalanced loading condition with grid voltages distortion. Moreover, the proposed RLM based control algorithm offers good steady state and dynamic performances with simple implementation. Experimental results obtained on a developed prototype in the laboratory, have demonstrated the performance of proposed control algorithm with grid currents distortion within the limits of the IEEE-519 standard.

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