Virtual Frequency Construction-Based Vector Current Control for Grid-Tied Inverter Under Imbalanced Voltage | Zendy

Wu Binbing | Zendy; Tian Yizhi | Zendy; Chen Yuxi | Zendy; Xiwang Abuduwayiti | Zendy; Liansong Xiong | Zendy

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Virtual Frequency Construction-Based Vector Current Control for Grid-Tied Inverter Under Imbalanced Voltage

Author(s) -

Wu Binbing,

Tian Yizhi,

Chen Yuxi,

Xiwang Abuduwayiti,

Liansong Xiong

Publication year - 2020

Publication title -

ieee access

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.587

H-Index - 127

ISSN - 2169-3536

DOI - 10.1109/access.2020.3030648

Subject(s) - aerospace , bioengineering , communication, networking and broadcast technologies , components, circuits, devices and systems , computing and processing , engineered materials, dielectrics and plasmas , engineering profession , fields, waves and electromagnetics , general topics for engineers , geoscience , nuclear engineering , photonics and electrooptics , power, energy and industry applications , robotics and control systems , signal processing and analysis , transportation

This paper proposes a fast phase capture (FPC) scheme and applies it to the control strategy of grid-tied inverters under imbalanced voltage. Firstly, a method for quickly extracting sequence components of power signals is derived through the symmetrical component method, and a real-time phase calculation method is proposed based on the rotating reference frame, thus avoiding the phase-locked loop (PLL) closed-loop adjustment process. Secondly, the grid-tied inverter suppresses the negative sequence current or power fluctuations through the direct resonance controller, so there is no need to separate the dynamically changing sequence current components. Finally, the experimental comparison with the PLL control strategy is carried out based on the RT-LAB platform. Compared with the previous phase-locking scheme, the FPC scheme has a faster phase-locking speed. Therefore, the fault ride-through capability of the grid-tied inverter is improved.

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