Transactions of China Electrotechnical Society  2018, Vol. 33 Issue (11): 2584-2591    DOI: 10.19595/j.cnki.1000-6753.tces.170514
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A Line Impedance Identification Based on Single Pulse Injection in DC Microgrid
Liu Chen, ZhaoJinbin, Wang Shanshan, Qu Keqing, Li Fen
School of Electrical Engineering Shanghai University of Electric Power Shanghai 200090 China

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Abstract  

InDCmicrogrid,the existence of line impedance on the parallel converteroutput side results in bad influence on the traditional droop control method.To solve this problem, this paper propose an active impedance detection method based on the DCmicrogridspecific system structure.By injectinga pulse disturbanceactively and detecting the changes of output voltage and current, the line impedance could be obtained and used to compensate the droop coefficient. This method improves the load current sharing accuracy and restores the dc bus voltage.Because the method belongs to the active impedanceidentification, the influence on power quality is tiny and controllable.Finally, simulation and experimental results validate the feasibility and effectiveness of the proposed method.

Key wordsDCmicrogrid      line impedance      load sharing      active impedance identification     
Received: 24 April 2017      Published: 13 June 2018
PACS: TM615  
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Liu Chen
ZhaoJinbin
Wang Shanshan
Qu Keqing
Li Fen
Cite this article:   
Liu Chen,ZhaoJinbin,Wang Shanshan等. A Line Impedance Identification Based on Single Pulse Injection in DC Microgrid[J]. Transactions of China Electrotechnical Society, 2018, 33(11): 2584-2591.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.170514     OR     https://dgjsxb.ces-transaction.com/EN/Y2018/V33/I11/2584
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