• Avanish Pratap SIngh
• Dr. Krishna Singh
• Sanjay Kumar

The Passivity Based Controller (PBC) utilizes an energy-based core, making it a reliable and straightforward development option. When a constant power load is present in DC microgrid systems, PBC is used to address instability issues in cascaded converter systems caused by input voltage changes and parametric uncertainty in the dc-dc buck power converter. To improve the control's robustness to variations in both the load and the line, a nonlinear disturbance observer (NDO) is designed and used as a feed-forward channel to compensate for disturbances. The NDO employs a disturbance estimation technique in conjunction with the PBC controller. In cascading converter systems, two buck converters are connected in sequence, with the source power converter being the first buck converter connected to the DC microgrid. A second power converter is connected to the first power converter to create a constant power load (CPL). However, due to CPL's negative resistance characteristic, stability issues arise. Simulation results are presented to illustrate the effectiveness of PBC with NDO when used with cascaded power converters.

Constant Power Load (CPL), Non-Linear disturbance Observer (NDO), Passivity Based Controller (PBC), Microgrid, Buck Converter

"Comparison of Passivity Based Controller with Adaptive Passivity Controller for Cascaded converter systems ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 5, page no.c130-c136, May-2024, Available :http://www.jetir.org/papers/JETIR2405216.pdf

"Comparison of Passivity Based Controller with Adaptive Passivity Controller for Cascaded converter systems ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 5, page no. ppc130-c136, May-2024, Available at : http://www.jetir.org/papers/JETIR2405216.pdf