Structural Resemblance Between Droop Controllers and Phase-Locked Loops
Structural Resemblance Between Droop Controllers and Phase-Locked Loops
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DOI：
10.1109/access.2016.2606348
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发表时间：
2016-09
期刊：
影响因子：
3.9
通讯作者：
Qing-Chang Zhong;D. Boroyevich
中科院分区：
文献类型：
--
作者：
Qing-Chang Zhong;D. Boroyevich
众所周知，下垂控制是电力系统运行的基础，现在逆变器的并联运行，而锁相环（PLL）在现代电气工程中被广泛采用。在本文中，它是在第一，下垂控制和PLL结构上彼此相似。这弥合了致力于下垂控制和PLL的两个社区之间的差距。因此，下垂控制器和PLL可以通过采用其他领域的进步来改进和进一步发展。这一发现，然后适用于操作传统的下垂控制器的逆变器与感性输出阻抗，以实现PLL的功能，而无需一个专门的同步单元。大量的实验结果验证了理论分析。
It is well known that droop control is fundamental to the operation of power systems and now the parallel operation of inverters, while phase-locked loops (PLLs) are widely adopted in modern electrical engineering. In this paper, it is shown at first that droop control and PLLs structurally resemble each other. This bridges the gap between the two communities working on droop control and PLLs. As a result, droop controllers and PLLs can be improved and further developed via adopting the advancements in the other field. This finding is then applied to operate the conventional droop controller for inverters with inductive output impedance to achieve the function of PLLs, without having a dedicated synchronization unit. Extensive experimental results are provided to validate the theoretical analysis.