Loss-Free Resistors: An Alternative to Passive Damping in Power Topologies

Identifier:  imarina:9470303

Handle: https://hdl.handle.net/20.500.11797/imarina9470303

Authors:  Sebastia-Rullo M; Cid-Pastor A; Valderrama-Blavi H; El Aroudi A; Martinez-Salamero L

Abstract:
This paper presents a systematic procedure based on the use of loss-free resistors (LFRs) to design active dampers for power converters with constant power load (CPL) in multi-bus power distribution systems. The proposed method is founded on the transformation of classical passive dampers into active ones by substituting their passive resistor by the emulated resistor of the LFR. The new active dampers preserve the dynamic behavior of the original passive networks without their power losses, because the power required for stabilization is recycled through the LFR to other uses in a multi-bus system. Considering the minimum power required for stabilization and the minimum increment of dynamic order after the LFR transformation, one passive network is selected out of five potential candidates and subsequently converted into an LFR-based active damper. The new active damper is used to stabilize the open-loop boost converter supplying a CPL and operating in continuous conduction mode. The LFR-based damper is also implemented by a boost converter that interfaces the input mesh of the main bus through a high-frequency transformer and a full-bridge rectifier. The stabilization power required by the main boost converter is reinjected into a DC load of the secondary boost converter. Theoretical predictions are verified by PSIM simulations and experiments in a prototype handling an input power of 200 W and using 6 W of that power for stabilization and recycling.