| 引用本文: | 朱晓荣,韩丹慧.基于虚拟惯性控制的直流微电网稳定性分析及其改进方法[J].电力自动化设备,2019,39(12): |
| ZHU Xiaorong,HAN Danhui.Stability analysis of DC microgrid based on virtual inertia control and its improved method[J].Electric Power Automation Equipment,2019,39(12): |
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| 摘要: |
| 虚拟惯性控制可以增强直流微电网的惯性，防止直流母线电压突变，但其对系统稳定性的影响还不明确。以基于虚拟惯性控制的直流微电网为研究对象，推导并网换流器和恒功率负载的小信号模型，得到电源侧输出阻抗和负载输入阻抗。根据频率分析法和阻抗匹配准则，分析虚拟惯性系数和恒功率负载对系统稳定性的影响。从阻抗匹配的角度出发，提出串联虚拟阻抗减小电源侧输出阻抗，从而提高系统稳定裕度。 |
| 关键词: 直流微电网 虚拟惯性控制 小信号模型 稳定性分析 虚拟阻抗 |
| DOI：10.16081/j.epae.201911011 |
| 分类号:TM727 |
| 基金项目: |
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| Stability analysis of DC microgrid based on virtual inertia control and its improved method |
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ZHU Xiaorong, HAN Danhui
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State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China
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| Abstract: |
| Virtual inertial control can enhance the inertia of the DC microgrid and prevent the sudden change of DC bus voltage, while its impact on system stability is still unclear. The DC microgrid based on virtual inertial control is taken as the research object, the small-signal models of grid-connected converter and constant power load are derived, and the source-side output impedances and load input impedance are obtained. According to the frequency analysis method and impedance matching criterion, the influences of virtual inertia coefficient and constant power load on system stability are analyzed. From the perspective of impedance matching, series of virtual impedance is proposed to reduce the source-side output impedance, so as to improve the stability margin of the system. |
| Key words: DC microgrid virtual inertia control small-signal model stability analysis virtual impedance |
