Nonlinear Disturbance Observer-based Passivity Controller for an Interleaved Boost Converter Feeding a Constant Power Load

The instability within the overall power system can arise due to the negative impedance behavior exhibited by the presence of a constant power load (CPL). This article tackles the challenge of stabilizing the DC bus voltage of interleaved boost converters under the influence of varying CPLs. To maintain stability and control the voltage across the DC bus, this research introduces a passivity-based control (PBC) approach that is resilient to load variations while also eliminating the steady state error induced by changes in the CPL. The resilience of the introduced control algorithm is achieved by incorporating a nonlinear disturbance observer (NDO) along with PBC. The suggested controller approach ensures stability against nonlinearity, rapid restoration, and accurate following of the global trajectory to the desired voltage across the DC bus. To validate and confirm the effectiveness of the control, the results from the MATLAB/Simulink simulation are presented.