Impact of Large Number of Same Aggregated Distributed Generators on the High-Frequency Oscillatory Stability of a DC Microgrids

doi:10.11930/j.issn.1004-9649.202105196

Abstract

Abstract: The construction of DC micro-grid is conducive to the nearby absorption of renewable energy. Meanwhile, the increase of power electronic devices in the micro-grid may lead to the occurrence of high-frequency oscillations and other phenomena, which requires the evaluation of the stability of small disturbances during planning. In the evaluation process, the number of micro-power source is approximately proportional to the dimension of the system state matrix, so a large number of micro-power source connections bring challenges to modal calculation. It is necessary to propose a method of order reduction to meet the requirements of small disturbance stability analysis of DC microgrid. The aggregated reduced order model for high frequency oscillations can reduce the workload of numerical calculation in the process of modal analysis of microgrids, which is helpful for better evaluation of microgrids in the planning stage. In the last part, simulations are carried out to verify the method for different micropower access quantity and different microgrid topology. The simulation results show that the method proposed in this paper can effectively evaluate the high frequency oscillation risk of DC micro-grid and simplify the difficulty of calculation.

Key words: multi-microsource small signal stability, reduced-order modal computation, dc microgrid, high-frequency oscillatory

ZHANG Tianyi, ZHENG Kaiyuan, WANG Haifeng. Impact of Large Number of Same Aggregated Distributed Generators on the High-Frequency Oscillatory Stability of a DC Microgrids[J]. Electric Power, 2021, 54(8): 103-108.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202105196

https://www.electricpower.com.cn/EN/Y2021/V54/I8/103

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