Optimised Damping Control of Islanded Dc Power Systems Using State Feedback

Abstract

DC microgrid contains a large number of tightly regulated closed-loop converters, which performance for the constant power loads and may cause stability problem of bus voltage when used as a load since they trend to draw constant power. In order to improve the stability of DC microgrid, this paper proposes a method for stabilization the DC microgrid based on the state feedback. e. In this study, the small disturbance linearised state equation of a DC-power grid with constant power load is derived to estimate the damping characteristics of DC voltage. To enhance the transient voltage stability, a novel DC- voltage damping control method is proposed, where both DC voltage and DC current are used as state feedback variables. Index Terms – DC microgrid; stabilization; islanded mode; constant-power load; PID controller