Improved low voltage ride-through control strategy for distributed virtual synchronous generator

被引：0

作者：

Hu H.-L. ^{[1
]}

Wan X.-F. ^{[2
]}

Ding X.-H. ^{[2
]}

Yu Y.-J. ^{[2
]}

机构：

[1] School of Electrical Engineering and Automation, Jiangxi University of Science and Technology, Ganzhou

[2] School of Information Engineering, Nanchang University, Nanchang

来源：

Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2020年 / 24卷 / 01期

关键词：

Distributed virtual synchronous generator; Low voltage ride-through; Low-voltage distribution network; Reactive current injection; Sequence current control; Virtual complex impedance;

D O I：

10.15938/j.emc.2020.01.018

中图分类号：

学科分类号：

摘要：

The traditional virtual synchronous control strategy has no ability to ride-through low voltage. The low voltage ride-through control technology of distributed virtual synchronous generator was proposed based on the analysis of the operating characteristics of the traditional virtual synchronous generator in the short circuit fault of the power grid. The PI controller was introduced to improve the response speed of reactive power control loop, and the calculation method of the power setpoint was redefined. Then, the output current was sequentially controlled in synchronous rotating coordinates to achieve three-phase balance of output current in asymmetric faults, and the instantaneous fault current is suppressed by introducing the virtual impedance. The improved low voltage ride through control technology of distributed virtual synchronous generator retains the power control loop, and does not change the basic mechanism of the virtual synchronous generator. When the fault occurs and disappears, only the power command value needs to be reset, and there is no need to change the control strategy. Simulation and experimental results verify correctness and effectiveness of the proposed control strategy. © 2020, Harbin University of Science and Technology Publication. All right reserved.

引用

页码：145 / 155

页数：10

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