基于改进阻抗分析法的多变流器直流微电网稳定性
摘要：直流微电网系统规模不断增大，大量变流器并入电网导致稳定性问题严峻，传统阻抗分析法在建立复杂拓扑网络的等效模型时存在一定局限性。为此，文章提出基于广义阻抗比的改进阻抗分析法，首先推广传统阻抗比的概念，根据端口特性建立系统等效模型，推导并定义广义阻抗比来表征系统稳定性。进一步对系统进行小信号建模，得出基于广义阻抗比的稳定判据进行分析。最后，通过算例分析和时域仿真验证了所提方法在多变流器直流微电网系统稳定性分析中的正确性和有效性。
Abstract:The scale of DC microgrid systems continues to increase, and a large number of converters are integrated into the power grid, resulting in severe stability problems, and the traditional impedance analysis method has certain limitations in establishing an equivalent model of complex topological networks. To this end, this paper proposes an improved impedance analysis method based on the generalized impedance ratio, first popularizes the concept of traditional impedance ratio, establishes a system equivalent model according to the port characterristics, and derives the concept of generalized impedance ratio to characterize system stability. The system is further modeled with small signals, and a stability criterion based on the generalized impedance ratio is obtained for stability analysis. Finally, the correctness and effectiveness of the stability analysis of the proposed method in the multivariate DC microgrid system are verified by example analysis and time domain simulation.
标题：基于改进阻抗分析法的多变流器直流微电网稳定性
英文标题：Research on the Stability of Multi-converter DC Microgrid Based on Improved Impedance Analysis Method
作者：周宇超, 屈克庆, 赵晋斌, 毛玲,
关键词：直流微电网, 改进阻抗分析法, 广义阻抗比, 稳定性分析, 多变流器,
发表日期：2023-12-04
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