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This paper deals with a tripartite control based on LCL-filter for a single-stage solar photovoltaic (PV) interconnected three-phase grid-tied system. This work proposes a novel tripartite control for LCL-filter based on sensing capacitor side voltage utilising two sensors. Conventionally, the control algorithm requires six sensors for sensing the inverter-side inductor current, capacitor side voltage, and grid-side inductor current. However, in this work, to execute the tripartite control algorithm, the only voltage across the filter capacitor need to be sensed. The voltage across the filter capacitor estimates inverter-side inductor current and grid-side inductor current. The proposed algorithm offers the advantage/benefit in reducing size, weight, and implemented cost. As an outcome, the reduction in the complexity of the hardware takes place. The implemented system is analysed for parametric variation to ensure the stability and robustness of the system. The system response is observed under digital control delay variation. The proposed method offers a cost-effective solution for meeting grid regulation. The implemented system is extensively tested and validated by simulation in the MATLAB/ Simulink platform. The justification of the system is carried out by experimental results obtained from the prototype designed in the laboratory.

This work implements a cascaded control for the LCL filter-based grid-connected neutral point clamped (NPC) inverter with the reduced sensor. The conventional three-loop control requires two current sensors for the inverter side, two voltage sensors for the voltage side, and two current sensors for the grid side in total for sensing. This work proposes a novel cascaded control scheme that allows a considerable reduction of grid-side current sensors and capacitor-side voltage sensors. Only two inverter-side current sensors are required for the same. The sensing point is implemented by the proposed estimation algorithm. As an outcome, the hardware complexity, weight, size, and implementation cost of the system are downsized. A comparative assessment is performed between the conventional technique and the proposed methodology. The system is analysed for grid inductance and LCL filter parametric variations in order to assure the robustness and stability of the system. In addition, the system is also investigated for the influence of digital control delay. The implemented system offers enhanced system stability and improved dynamic performance. In order to meet grid regulation, it offers an economical solution. The proposed system is justified by simulated results on the MATLAB/Simulink platform and verified by the experimental results.

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