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Stability of multi-source droop-controlled Electrical Power System for more-electric aircraft

The paper deals with the stability of DC Electrical Power System (EPS) with paralleled sources for More Electric Aircraft (MEA). It is known that in presence of tightly controlled power-electronic driven loads the EPS bus capacitances and cable impedances have a significant effect on the system stability boundaries. The paper investigates these boundaries for one of the major paradigms for future MEA EPS that assumes multiple sources feeding into the single main bus. The power sharing between the sources is achieved by implementing droop control. The paper considers possible droop strategies, derives corresponding reduced-order models and applies the impedance criteria to derive EPS stability margins. For the case system considered, the root contours were employed to derive the bus capacitor values to ensure EPS stable operation. The derived stability margins are verified through time-domain simulations.