WANG Mian,TANG Fen,ZHAO Yuming,et al.Parameter Adaptive Control Strategy of Virtual DC Machine[J].Automation of Electric Power Systems,2020,44(14):148-155.
WANG Mian,TANG Fen,ZHAO Yuming,et al.Parameter Adaptive Control Strategy of Virtual DC Machine[J].Automation of Electric Power Systems,2020,44(14):148-155. DOI: 10.7500/AEPS20190909001.
Parameter Adaptive Control Strategy of Virtual DC Machine
In order to improve the stability of the DC microgrid
the virtual DC machine (VDCM) control is applied to the DC converters
so that the converters have the external characteristics of the DC machine. However
the traditional VDCM with constant control parameters is difficult to supply inertia and damping support while achieving good dynamic performance. Aiming at this issue
Buck converter is taken as the research object in the paper. Firstly
the small-signal model of VDCM control is built
and the influence of inertia and damping coefficient on the dynamic characteristics of output voltage is analyzed when the load power changes suddenly. On this basis
an parameter adaptive control strategy based on VDCM is proposed
and the adaptive adjustment rules of inertia and damping coefficient and parameter setting method are given. Finally
the simulation and experimental results show that
compared with the traditional VDCM control strategy
the proposed control strategy can provide inertial and damping support while achieving faster response and smaller overshoot
which presents better fluctuation suppression of DC bus voltage.
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