Control of Interleaved Dual Boost Converter for Solar PV-Systems

The structural interleaved dual boost converter (IDDBC) is regarded as a promising and dependable method for integrating low-voltage renewable energy sources (RESs), including battery packs, fuel cells, and photovoltaic (PV) panels. Its advantageous features include a higher voltage step-up ratio and a reduction in voltage and current stresses on the power devices. As a result, the IDDBC serves as a favorable choice for efficiently interfacing with various low-voltage RESs, offering improved performance and reliability. The present paper investigates the problem of controlling an interleaved dual boost converter associated with a PV panel. The main control objectives of the system involve three aspects: i) regulating the voltage across the PV panel to maximize power extraction; ii) regulating the output voltage; and iii) controlling the inductor current. To achieve these goals, a multi-loop controller structure is employed. The PV generator is controlled to track the maximum power point, while two cascaded loops are designed using PI controllers. The outer loop ensures control over the energy, represented by the output voltage stored in the output capacitor. The inner loop focuses on individual control of the inductor currents in each sub-converter, with their references generated from the outer loop controller. The system's performance is assessed through simulations in the MATLAB / SimPowerSystems environment. The results demonstrate that the proposed controller successfully accomplishes its objectives, exhibiting robust dynamic response and resilience against parameter fluctuations and disturbances.