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| Large-Signal Stability Analysis and Active Damping Compensation Methods for DC Microgrid |
| Ming Jia, Wang Yubin, Wang Fan, Tian Xinna |
| School of Electrical Engineering Shandong University Jinan 250061 China |
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Abstract In DC microgrid, varieties of power electronic converters are connected to the DC bus with different control methods. Some of these converters are controlled by closed voltage loops, thus their output voltages are accurately maintained at a constant value. They behave as constant power loads（CPLs）and have a destabilizing effect from negative incremental resistance（NIR）and their nonlinearities. The large-signal stability of the DC microgrid with multiple CPLs are studied in this paper, The T-S fuzzy model method is used to estimate the region of asymptotic stability（RAS）of DC microgrid. In order to improve the stability, enlarge the region of asymptotic stability, active damping compensation is introduced. The optimal compensation location can be found right after by analyzing and comparing the effects of introducing active damper at different locations. Finally, the correctness and effectiveness of the theoretical analysis and active damping compensation method are verified by simulation and RTLAB hardware in the loop experiments.
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Received: 06 July 2020
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2021, Vol. 36 
