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A unified control of Super-capacitor System Based on Bi-directional DC-DC Converter for Power Smoothing in DC Microgrid

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Journal of Modern Power Systems and Clean Energy 2023年第3期11卷 938-949页

作者： Xialin Li Pengfei Li Leijiao Ge Xunyang Wang Zhiwang Li Lin Zhu Li Guo Chengshan Wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China School of Information and Electronic Engineering Hebei University of EngineeringHandan 056038China Binhai Power Supply Bureau of State Grid Tianjin Electric Power Company Tianjin 300480China

To improve the equivalent inertia of DC microgrids(DCMGs),a unified control is proposed for the first time for a bi-directional DC-DC converter based super-capacitor(SC)system,whereby power smoothing and SC terminal voltage regulation can be achieved in a DCMG *** proposed control displays good plug-and-play features using only local *** quantitative analysis and effective design of the critical parameter of unified control,two indices,equivalent power supporting time and inertia contributed by the unified controlled SC system,are introduced ***,with a simple but effective reduced-order model of a DCMG,analytical solutions are obtained for the two *** addition,a systematic design method is presented for the proposed unified ***,to verify the proposed unified control,a switching model is developed for a typical DCMG in PSCAD/EMTDC,and theoretical analyses are conducted for different operating conditions.

关键词： DC microgrid DC-DC converter super-capacitor unified control equivalent power supporting time and inertia power smoothing

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Equilibrium mechanism between dc voltage and ac frequency for ac-dc interlinking converters

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iEnergy 2022年第3期1卷 279-284页

作者： Haixu Shi Kai Sun Xiaochao Hou Yunwei Li Haihao Jiang Guangdong Midea Refrigeration Equipment Co. Ltd.GuangdongFoshan 528311China Department of Electrical Engineering State Key Laboratory of Power SystemsTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering University of AlbertaEdmontonAB T6G 1H9Canada

The equilibrium between dc bus voltage and ac bus frequency(Udc-f equilibrium)is the algorithm core of unified control strategies for ac-dc interlinking converters(ILCs),because the equilibrium implements certain ***,what the mechanism is has not been explicitly explored,which hinders further studies on unified *** paper reveals that the state-space model of a Udc-f equilibrium controlled ILC is highly similar to that of a shaft-to-shaft machines *** a detailed mechanism is dis-covered and named“virtual shaft-to-shaft machine(VSSM)”mechanism.A significant feature of VSSM mechanism is self-synchro-nization without current sampling or ac voltage sampling.

关键词： Virtual machine interlinking converter unified control microgrid.

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