In this paper, an adaptive method for tuning a proportional-resonance controller for synchronization of the grid-connected inverters is presented. In the proposed approach, the grid frequency is obtained by minimizing the error signal using a frequency-locked loop mechanism that consists of a resonant adaptive filter and a perturbation-based extremum seeking algorithm. Simulations and experimental studies are presented to demonstrate performance of the proposed controller in face of the frequency variations of an emulated grid voltage waveform. The results are compared with conventional nonadaptive methods, which indicate that performance characteristics for voltage/frequency tracking and power factor can be achieved based on the IEEE 1547 standard.

中文翻译：

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用于同步并网逆变器的自适应 PR 控制器


本文提出了一种调整比例谐振控制器以实现并网逆变器同步的自适应方法。在所提出的方法中，通过使用由谐振自适应滤波器和基于扰动的极值搜索算法组成的锁频环机制最小化误差信号来获得电网频率。仿真和实验研究证明了所提出的控制器在面对仿真电网电压波形的频率变化时的性能。结果与传统的非自适应方法进行了比较，表明可以基于 IEEE 1547 标准实现电压/频率跟踪和功率因数的性能特征。