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This article presents a distribution feeder supported single-stage photovoltaic (PV) energy conversion system (PVECS), in which, a voltage source converter is used. It serves for harnessing maximum power from a PV source as well as to inject that harnessed power from PVECS into the distribution feeder with enhanced power quality. The harmonics reduction, distribution feeder currents balancing, power factor correction, compensation of load currents are additional attributes provided by this PVECS as compared to a traditional PV inverter. Moreover, this system also works well in weak distribution network during sag or swell in the grid voltages. The robust correntropy induced metric based normalized least mean fourth algorithm is used here to extract the real power portion of load currents. Besides, this PV contribution is added to distribution feeder currents to improve the dynamic response during varying environmental conditions. Additionally, when solar power is not available, this system serves for power quality enhancement at the distribution network, which makes the system cost effective, because its power converter is utilized up to its extreme level. This control approach is tested at different ambience conditions through a developed prototype in the laboratory either in available solar generation or in absence of it. [ABSTRACT FROM AUTHOR]

This paper deals with a multipurpose distributed sparse (DS) control approach for a single stage solar photovoltaic (PV) energy generation system (SPEGS). This SPEGS is interfaced here to the three phase grid at varying solar irradiance and compensating the nonlinear load tied at point of common interconnection. The SPEGS performs multitasks. It feeds the generated solar PV power to the local three phase grid. It reduces the harmonics of loads and furnished balanced currents of local three-phase grid. The SPEGS uses a solar PV array, a voltage source converter (VSC), a nonlinear load, a three phase grid, and a dc-link capacitance. In case, when the solar irradiance is not available, the proposed system works as distribution static compensator by utilizing same VSC. For extracting maximum power from the PV source, the traditional perturb and observe (P&O) scheme is utilized here. The tracking performance and efficiency of P&O technique are also examined here at rapid changing climatic conditions to show the behavior of the P&O scheme. The DS control approach is capable to estimate required fundamental component to find out reference grid currents. The proposed control approach is validated on a developed prototype in the laboratory. [ABSTRACT FROM AUTHOR]

This paper deals with a control technique of a three-phase grid connected solar photovoltaic (SPV) system, which is based on the fast zero attracting normalized least mean fourth algorithm. This control algorithm achieves the objectives of mitigation of power quality issues such as harmonics reduction and power factor correction, together with extraction of peak power generated by the PV array. The system uses a PV array, a voltage-source converter (VSC), and linear and nonlinear loads. Here, VSC is connected to a PV array to transfer the active power to the three-phase load and the grid. The dependence on tuning of proportional-integral controller is reduced because of the feedforward term of the PV power. Due to this, the system dynamic response is improved, which makes the system quite robust. The system goals are to mitigate power quality problems and to provide current conditioning while operating in coherence with a weak distribution grid, which has poor quality of power in terms of voltage distortions with imbalances. MATLAB/Simulink is used to develop the model of the proposed system. The validation of proposed control is done at varying linear and nonlinear loads and under different environmental conditions on a prototype developed in the laboratory. [ABSTRACT FROM PUBLISHER]