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The Active Damping Stabilization of AC-DC Power Systems Feeding Constant Power Loads


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DOI: https://doi.org/10.15866/iree.v12i4.12318

Abstract


Power converters with their controls normally behave as constant power loads. These loads have small-signal negative impedance to the system. The negative impedance of CPLs can degrade the system stability. Therefore, this paper presents the mitigation technique to eliminate the destabilizing effect of CPLs for AC-DC power systems. The proposed mitigation technique is based on the active method which is normally used in DC-DC converters. As for the AC-DC power system, the switching device is added into the filter circuit that acts as an additional DC-DC conversion stage to control the output DC voltage. The virtual resistance can then be used to increase the filter damping via adjusting the duty cycle of added switching device. As a result, the AC-DC feeder system can return to stable operation when the proposed stabilization is activated. The stability analysis, simulation and experimental results are used to verify the effectiveness of the proposed active damping stabilization.
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Keywords


Constant Power Load (CPL); AC-DC Converters; Active Damping Technique; Negative Impedance Instability

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References


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