Voltage and current proportional control for AC capacitor-less grid-forming converter with fault current limitation

被引：0

作者：

Guan M. ^{[1
]}

Shen J. ^{[1
]}

Lou P. ^{[1
]}

Lai J. ^{[1
]}

Li F. ^{[1
]}

Wang J. ^{[1
]}

机构：

[1] Huzhou Power Supply Company, State Grid Zhejiang Electric Power Company Limited, Huzhou

来源：

Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2023年 / 43卷 / 07期

关键词：

capacitor-less vector voltage control; electric converters; fault ride-through; grid-following; grid-forming; unbalanced; virtual synchronous generator; voltage and current proportional control;

D O I：

10.16081/j.epae.202211018

中图分类号：

学科分类号：

摘要：

By introducing the voltage and current proportional relationship，a capacitor-less vector voltage control is proposed for the high-voltage grid-forming converter. A cascaded control architecture is composed of the proposed outer-loop voltage control and conventional inner-loop current control. The positive-current limitation and negative-sequence current suppression capabilities are retained to prevent the converter from over-current blocking and damage during grid faults. Unlike the conventional outer-loop voltage control，the proposed voltage-current proportional control is developed irrespective of the AC-side shunt filter capacitor，which is suitable for outer-loop voltage control of the high-voltage grid-forming converter. By selecting the specific AC voltage frequency reference，the grid-forming converter can realize either constant voltage operation or virtual synchronous generator（VSG） operation. The time-domain simulative results show that the negative-sequence current suppression and fault ride-through capabilities are automatically realized by the proposed converter control during grid faults. Moreover，the grid-forming converter is prevented from over-current blocking and damage，and can be restored to the normal operation condition when the grid fault is cleared. © 2023 Electric Power Automation Equipment Press. All rights reserved.

引用

页码：197 / 203

页数：6

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