电力系统保护与控制2024，Vol.52Issue(16)：141-149,9.DOI:10.19783/j.cnki.pspc.231300
MMC型柔性直流输电系统的中高频振荡无源阻尼抑制策略
Passive damping suppression strategy for medium and high frequency oscillations in MMC type flexible DC transmission systems
摘要
Abstract
Long control link delays can lead to negative damping in the impedance range of flexible DC transmission systems based on modular multi platform converters(MMC).These can easily interact with distributed capacitors in the AC system and cause high-frequency oscillations.Although existing active damping suppression strategies can effectively suppress high-frequency oscillations,they will deteriorate the impedance characteristics of the mid frequency range and increase the risk of mid frequency oscillations.To effectively suppress mid-to-high frequency oscillations,this paper proposes a passive damping suppression strategy by paralleling a passive impedance reshaping device at the AC side bus of the MMC.First,an MMC simplified model is derived and its accuracy is verified.Secondly,impedance reshaping device parameters are designed based on the Nyquist stability criterion and minimum power loss constraint to achieve impedance reshaping of the MMC system.Finally,the impedance method is applied to compare the impedance characteristics of the MMC system before and after reshaping,and the correction effect of the impedance reshaping device on the impedance of the MMC system is analyzed.An MMC electromagnetic transient simulation model with a passive impedance reshaping device is built in PSCAD/EMTDC.The results show that this suppression strategy can effectively suppress the oscillation phenomenon of the MMC system in the mid-to-high frequency range,with little impact on the steady-state characteristics of the system,and low fundamental frequency power loss.关键词
柔性直流输电/MMC简化模型/中高频振荡/阻抗稳定分析/无源阻抗重塑装置Key words
flexible DC transmission/MMC simplified model/mid-to-high frequency oscillations/impedance stability analysis/passive impedance reshaping device引用本文复制引用
聂永辉,张德伟,高磊,吴春迎,张瑞东..MMC型柔性直流输电系统的中高频振荡无源阻尼抑制策略[J].电力系统保护与控制,2024,52(16):141-149,9.基金项目
This work is supported by the Natural Science Foundation of Jilin Province(No.20230101216JC). 吉林省自然科学基金项目资助(20230101216JC) （No.20230101216JC）
