摘要
不对称故障中构网型变流器面临暂态稳定与电能质量的矛盾,目前主要采用的基于指令切换的穿越方法难以解决功率二倍频抑制与电流不对称度削弱的问题,为此本文提出了一种多目标优化控制方法。首先,通过分析功率环控制参数改造机制,明确故障下指令与控制量合理设计是平稳穿越的关键;其次,综合修正对称故障下变流器的有功功率指令、电压指令及阻尼参数以提升它的暂态稳定性;然后,分析不对称故障对变流器暂态特性的影响,并基于对称穿越方法,通过检测负序分量额外投入角频率偏差积分反馈实现不对称故障的平滑穿越,同时采用模糊控制选择负序环节的电流指令实现二倍频抑制和电流不对称平衡的多目标策略设计。最后,仿真验证了该方法可提升故障穿越性能和兼顾电能质量的灵活度。
The Grid⁃forming converter(GFM)face a contradiction between transient stability and power quality un⁃der asymmetric faults.The currently dominant fault ride⁃through(FRT)method based on command switching fails to effectively address the issues of suppressing power double⁃frequency components and reducing current asymme⁃try.To resolve these problems,this paper proposes a multi⁃objective optimal control method.First,by analyzing the modification mechanism of power loop control parameters,it is clarified that the reasonable design of commands and control variables under faults is critical to achieving smooth FRT.Second,the active power reference,voltage reference,and damping parameters of GFM under symmetric faults are integrally adjusted to enhance their transient stability.Next,the impact of asymmetric faults on the transient characteristics of GFM is analyzed.Building on the symmetric FRT method,smooth FRT under asymmetric faults is realized by additionally applying the integral feed⁃back of angular frequency deviation upon detecting negative⁃sequence components.Meanwhile,a multi⁃objective strategy for suppressing power double⁃frequency components and balancing current asymmetry is designed using fuzzy control to select the current reference in the negative⁃sequence loop.Finally,simulation results verify that the proposed method enhances FRT performance and improves the flexibility in power quality.
作者
邵尹池
胡演
巩宇
黄贤淼
丁然
贾焦心
徐越
SHAO Yinchi;HU Yan;GONG Yu;HUANG Xianmiao;DING Ran;JIA Jiaoxin;XU Yue(Electric Power Research Institute,State Grid Jibei Electric Power Company Limited,Beijing 100032,China;Hebei Key Laboratory of Distributed Energy Storage and Microgrid(North China Electric Power University),Baoding 071003,China;State Grid Jibei Electric Power Co.,Ltd.,Beijing 100032,China)
出处
《电工电能新技术》
北大核心
2025年第11期30-46,共17页
Advanced Technology of Electrical Engineering and Energy
基金
国网冀北电力有限公司科技项目(B3018K23000A)
国家自然科学基金项目(52207102)。
关键词
构网型变流器
不对称故障工况
暂态稳定性分析
控制方法改造
多目标策略
grid⁃forming converter
unbalanced fault conditions
transient stability analysis
control method trans⁃formation
multi⁃objective strategy
