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Grid-Connected Control Strategy of VSG under Complex Grid Voltage Conditions

Bin Zhang, Yanjun Jin*

School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou, China

* Corresponding Author: Yanjun Jin. Email: email

Energy Engineering 2022, 119(4), 1467-1482. https://doi.org/10.32604/ee.2022.018233

Abstract

Under complex grid conditions, the grid voltage usually has an imbalance, low order harmonics, and a small of DC bias. When the grid voltage contains low order harmonics and a small amount of DC bias component, the inverter's output current cannot meet the grid connection requirements, and there is a three-phase current imbalance in the control strategy of common VSG under unbalanced voltage. A theoretical analysis of non-ideal power grids is carried out, and a VSG control strategy under complex operating conditions is proposed. Firstly, the third-order generalized integrator (TOGI) is used to eliminate the influence of the DC component of grid voltage. An improved delay signal cancellation (DSC) method is proposed to control the balance current and power fluctuation under unbalanced voltage based on the method of common VSG positive and negative sequence separation, It also eliminates the harmonic of command current. Then, the improved quasi proportional resonant controller (QPR) cascaded PI is used to suppress the harmonic current further so that the harmonic content of grid-connected current can meet the grid-connected requirements and achieve the three-phase current balance. Finally, the proposed strategy is verified by simulation under the control objectives of the current balance, active power, and reactive power constant.

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Cite This Article

APA Style
Zhang, B., Jin, Y. (2022). Grid-connected control strategy of VSG under complex grid voltage conditions. Energy Engineering, 119(4), 1467-1482. https://doi.org/10.32604/ee.2022.018233
Vancouver Style
Zhang B, Jin Y. Grid-connected control strategy of VSG under complex grid voltage conditions. Energ Eng. 2022;119(4):1467-1482 https://doi.org/10.32604/ee.2022.018233
IEEE Style
B. Zhang and Y. Jin, “Grid-Connected Control Strategy of VSG under Complex Grid Voltage Conditions,” Energ. Eng., vol. 119, no. 4, pp. 1467-1482, 2022. https://doi.org/10.32604/ee.2022.018233



cc Copyright © 2022 The Author(s). Published by Tech Science Press.
This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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