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The objective of this work is to present a resilient nonlinear control strategy for a DC-DC buck power converter with a CPL in a distributed generation system. In constant power load, the input voltage decreases/increases concerning increases/decreases of input current, and at its terminals, it exhibits the attributes of a negative impedance. Due to this behavior, it will impact the dynamics, stability, and power quality of the converter system. Moreover, the dc-bus voltage changes will happen when the system experiences disturbances like changes in load and change in input voltage. The passivity-based control (PBC which is a simple form of PD) strategy has been utilized to address the instability issues caused by the CPLs. However, the main drawback of PBC is, that it will not eliminate steady-state error and has a slow dynamic response. It is proved that the addition of an integral term to PBC (PBC-PID) ensures the elimination of limit cycles caused by the CPLs, large signal stability, and fast recovery performance of the system during the disturbance. The resilience of the proposed PBC and PBC-PID non-linear control strategies simulation results were validated through the MATLAB/Simulink environment.

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A Resilient Passivity-Based Control Approach for a Two-Input DC-DC Buck Converter with Constant Power Loads in Distributed Generation Systems

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  • 发表日期：

    2025年

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  • Amarendra Reddy Bhimavarapu,
  • Ch Nayak Bhukya,
  • Dharani Naidu,
  • Surender Reddy Salkuti

摘要

The objective of this work is to present a resilient nonlinear control strategy for a DC-DC buck power converter with a CPL in a distributed generation system. In constant power load, the input voltage decreases/increases concerning increases/decreases of input current, and at its terminals, it exhibits the attributes of a negative impedance. Due to this behavior, it will impact the dynamics, stability, and power quality of the converter system. Moreover, the dc-bus voltage changes will happen when the system experiences disturbances like changes in load and change in input voltage. The passivity-based control (PBC which is a simple form of PD) strategy has been utilized to address the instability issues caused by the CPLs. However, the main drawback of PBC is, that it will not eliminate steady-state error and has a slow dynamic response. It is proved that the addition of an integral term to PBC (PBC-PID) ensures the elimination of limit cycles caused by the CPLs, large signal stability, and fast recovery performance of the system during the disturbance. The resilience of the proposed PBC and PBC-PID non-linear control strategies simulation results were validated through the MATLAB/Simulink environment.