| 引用本文: | 闫俊丽,彭春华,陈臣.基于动态虚拟阻抗的低压微电网下垂控制策略[J].电力系统保护与控制,2015,43(21):1-6.[点击复制] |
| YAN Junli,PENG Chunhua,CHEN Chen.Droop control strategy based on dynamic virtual impedance in low-voltage microgrid[J].Power System Protection and Control,2015,43(21):1-6[点击复制] |
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| 摘要: |
| 传统的下垂控制策略已无法适用于线路阻感比较大的低压微电网。加入虚拟阻抗能改善线路阻感比，提高运行稳定性，但也导致了电压降落过大。其虚拟阻抗值的设定受系统阻抗值实际测量难度及随线路投切的影响，亦无法确定。因此，提出了一种基于动态虚拟阻抗的改进控制策略。设计的动态虚拟阻抗随负载电流和电压降落幅值而变化，虚拟阻抗值在动态虚拟阻抗环的作用下，不断自适应地调整取值，解决了虚拟阻抗值无法确定的问题。在满足系统稳定性的同时，减少了线路电压降落，抑制了系统环流，改善了系统的电能质量。仿真和实验结果验证了该控制策略的可行性及有效性。 |
| 关键词: 低压微电网 下垂控制 动态虚拟阻抗 电压降落 |
| DOI：10.7667/j.issn.1674-3415.2015.21.001 |
| 投稿时间：2015-01-28修订日期：2015-04-16 |
| 基金项目:国家自然科学基金项目(51167005，51567007)；教育部人文社科青年基金项目(14YJCZH135)；江西省科技支撑计划项目(20142BBE50001)；江西省自然科学基金项目 (20152ACB20017，20151BAB216020) |
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| Droop control strategy based on dynamic virtual impedance in low-voltage microgrid |
| YAN Junli,PENG Chunhua,CHEN Chen |
| (School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China) |
| Abstract: |
| The conventional droop control can’t adapt to large resistance-inductance ratio of line in low-voltage microgrid. Introducing virtual impedance can improve resistance-inductance ratio of line and increase operation stability, while it may lead to great voltage drop. The value setting of virtual impedance is influenced by difficult practical measurement of system virtual impedance and lines switching, which can’t be confirmed either. An improved control strategy based on dynamic virtual impedance is proposed. The designed dynamic virtual impedance is changed with the load current and the drop of voltage amplitude. The value of virtual impedance is adjusted adaptively and constantly under the work of the dynamic virtual impedance loop, so that the problem of virtual impedance value setting can be solved. At the same time, the voltage drop is reduced, circulating current is inhibited and the system power quality is improved effectively, while the system stability performance is satisfied. Simulation and experimental results verify the feasibility and effectiveness of the proposed control strategy. |
| Key words: low voltage microgrid droop control dynamic virtual impedance voltage drop |
