Parameter adaptive virtual DC generator control strategy for DC microgrid

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  • (College of Marine Engineering, Dalian Maritime University, Dalian 116026,China)

Received date: 2022-11-15

  Revised date: 2023-02-01

  Accepted date: 2023-02-01

  Online published: 2023-02-01

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Abstract

Aiming at the problem that the sudden change of load power in the DC microgrid will cause the large fluctuation of bus voltage, even caused the system instability in serious cases, a virtual DC motor parameter adaptive control strategy based on differential compensation was proposed, taking the energy storage parallel converter as the study object. The strategy feedback the output voltage deviation of the energy storage converter to the differential compensation coefficient, so that the compensation coefficient can adjust the compensation coefficient size in real time as the load fluctuation, result in reducing effectively the impact of power fluctuation on the system stability, improving the dynamic performance of system, and realizing the parallel power distribution according to the ratio of the armature resistance in the control of each converter in the parallel system. The smallsignal model of the system was established, and the influence of key control parameters on the system stability was analyzed by using Bode diagram and impedance ratio criterion. MATLAB/Simulink simulation and StarSim HIL experimental platform verify the effectiveness of the proposed parameter adaptive control strategy for the virtual DC generator.

Cite this article

WU Ming, LIN Yejin, ZHANG Qinjin, ZENG Yuji, ZHANGHanwen . Parameter adaptive virtual DC generator control strategy for DC microgrid[J]. Journal of Dalian Maritime University, 2023 , 49(2) : 131 -140 . DOI: 10.16411/j.cnki.issn1006-7736.2023.02.014

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