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Improved secondary control for optimal total harmonic distortion compensation of parallel connected DGs in islanded microgrids

机译：改进的二次控制可优化孤岛微电网中并联DG的总谐波失真最佳补偿

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摘要

This study proposes a two-layer hierarchical control to actualize optimal total harmonic distortion (THD) compensation in different buses of parallel-connected inverters in islanded microgrids which had not been studied so far. The proposed secondary layer is used to realize THD compensation of sensitive load bus (SLB) and make distributed generators (DGs) distribute the compensating efforts between them according to their rated capacity. It is noteworthy that improving THD at the SLB can lead to an increase in THD at local buses and/or DG terminals. Although the THD limitations of these buses are not as strict as the THD limitation of SLB, it is necessary to control them within their allowed range. This important problem is not well studied in the literature. A novel complementary part is designed and added to the secondary control to tune the compensation portion of each DG while the THD limitations in DG terminals and local buses are considered. The proposed method actualizes a multi-level voltage quality control in multi-bus islanded microgrids with parallel DGs through a simple yet effective solution. Furthermore, considering the DGs peak current limitation is added to the controller and a method for calculating this peak value is proposed.
机译：这项研究提出了一个两层分层控制，以实现迄今为止尚未研究的孤岛微电网中并联逆变器的不同母线的最佳总谐波失真（THD）补偿。拟议的第二层用于实现灵敏负载母线（SLB）的THD补偿，并使分布式发电机（DG）根据其额定容量在它们之间分配补偿功。值得注意的是，改善SLB的THD会导致本地总线和/或DG终端的THD升高。尽管这些总线的THD限制不如SLB的THD限制严格，但必须将它们控制在允许的范围内。这个重要问题在文献中没有得到很好的研究。设计了一个新颖的补充部件，并将其添加到辅助控件中，以调整每个DG的补偿部分，同时考虑DG端子和本地总线中的THD限制。所提出的方法通过一个简单而有效的解决方案实现了具有并联DG的多总线孤岛微电网的多级电压质量控制。此外，考虑到DGs峰值电流限制已添加到控制器，并提出了一种计算该峰值的方法。

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