Review of Impedance-Reshaping-Based Power Sharing Strategies in Islanded AC Microgrids
Review of Impedance-Reshaping-Based Power Sharing Strategies in Islanded AC Microgrids
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DOI：
10.1109/tsg.2022.3208752
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发表时间：
2023-05
影响因子：
9.6
通讯作者：
Fei Deng;W. Yao;Xiaobin Zhang;Yi Tang;P. Mattavelli
中科院分区：
文献类型：
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作者：
Fei Deng;W. Yao;Xiaobin Zhang;Yi Tang;P. Mattavelli
在孤岛交流微电网中，负载由基于并联逆变器的分布式发电（DG）单元提供。准确的功率共享是一项必不可少的任务，而功率共享往往会因DG单元的线路阻抗不匹配而降低。通过消除输出阻抗失配，重构DG机组的输出阻抗是提高功率共享性能的有效方法。本文对各种基于阻抗重构的功率共享策略进行了分类和总结。首先，从功率共享精度、不平衡和谐波功率共享、对电压调节的影响、对通信的依赖以及实际应用的可行性等方面阐述了功率共享方法的综合评价标准。根据工作原理，现有的阻抗重塑方法可分为固定虚拟阻抗、自适应虚拟阻抗调节、阻抗下降和内环重构四大类。然后分别讨论了四种阻抗重构技术的优缺点。最后，总结了基于阻抗重塑的各种功率共享方法的特点，并对孤岛交流微电网改进功率共享的阻抗重塑策略的未来研究趋势进行了预测。
In islanded AC microgrids, loads are supplied by parallel inverters-based distributed generation (DG) units. Accurate power sharing, which is always degraded by the mismatched line impedances of DG units, is an essential mission. Reshaping the output impedance of DG units is an effective method to improve power sharing performance via eliminating the impedance mismatch. This paper classifies and summarizes various impedance-reshaping-based power sharing strategies. Firstly, the comprehensive evaluation criteria of the power sharing methods are illustrated in terms of power sharing accuracy, unbalanced and harmonic power sharing, influence on voltage regulation, dependence on communication and feasibility in practical applications. According to the operating principles, the existing impedance reshaping methods are categorized into four groups: fixed virtual impedance, adaptive virtual impedance regulation, impedance droops, and reconfiguration of inner loops. Then the advantages and disadvantages of the four groups of impedance reshaping techniques are discussed respectively. Finally, the characteristics of different impedance-reshaping-based power sharing methods are summed up and future research trends of impedance reshaping strategies for power sharing improvement in islanded AC microgrids are predicted.