Distributed MPPT for Solar Strings Under Shading and Panel Mismatch

The patent divides the PV array into multiple independent strings, each equipped with its own MPPT controller. This segmentation allows each string to operate independently at its maximum power point, preventing the weakest link from limiting overall system performance. The controller allocates current from each string independently, maximizing total power harvesting while maintaining manageable system complexity through modular architecture.

The patent segments the PV array into multiple parallel strings rather than using one long series connection. This segmentation isolates shading effects to individual strings, preventing a single shaded cell from affecting the entire array. Each string maintains its own MPPT controller that can independently manage current flow, ensuring that shaded strings do not compromise the reliability or performance of unshaded strings.

The patent implements distributed MPPT controllers at the string level rather than requiring individual panel-level control. This segmentation strategy achieves most of the power optimization benefits by treating each string as an independent unit, significantly reducing the number of controllers needed compared to full panel-level distribution. The modular string-level approach balances power harvesting efficiency with acceptable device complexity.

The patent segments the PV array into multiple independent strings, each with its own MPPT controller that manages current allocation independently. This segmentation prevents the weakest link from dragging down overall system performance, as each string operates at its own maximum power point. The inverter receives optimized current from each string separately, minimizing energy losses while maintaining ease of operation through automated string-level control.