Low-frequency oscillation characteristic analysis of grid-connected VSG-PMSG via MMC-HVDC system

被引：0
|
作者：
Li Y. [1 ]
Chu W. [1 ]
Liu H. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2023年 / 43卷 / 09期
关键词：
damping loop; eigenvalue analysis; low-frequency oscillation; modular multilevel converter; phase locked loops; VSG-PMSG;
D O I：
10.16081/j.epae.202212010
中图分类号：
学科分类号：
摘要：
The virtual synchronous generator of permanent magnet synchronous generator（VSG-PMSG） is interconnected with the modular multilevel converter based high voltage direct current（MMC-HVDC） through the power synchronization loop，and there will be a risk of low-frequency oscillation. Considering the inner dynamic process of the MMC-HVDC and the rotor-side converter and grid-side converter of direct-drive wind turbine，the small-signal model of grid-connected VSG-PMSG via MMC-HVDC system is firstly established，and its accuracy is verified by the refined electromagnetic transient simulation. Then，using the root locus method，by analyzing the influence of wind power fluctuation and AC system strength variation on the stability of the interconnected system，a parameter tuning method for VSG-PMSG with power variation is designed. The results show that due to the power outer loop and the voltage loop of MMC-HVDC sending-end rectifier，the interconnected system has low-frequency oscillation during the process of wind farm output power increasing and AC system strength decreasing. By adjusting the controller parameters of the phase locked loop，the VSG active power loop and the voltage loop of MMC-HVDC sending-end rectifier，and changing the form of VSG damping loop，the oscillation can be suppressed and the stable operation can be achieved. © 2023 Electric Power Automation Equipment Press. All rights reserved.
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页码：186 / 193
页数：7
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