电力系统及其自动化学报2025，Vol.37Issue(4)：98-106,9.DOI:10.19635/j.cnki.csu-epsa.001515
基于快速延时信号相消滤波理论的改进VSG低电压穿越策略
Improved Low Voltage Ride-through Strategy for VSG Based on Fast Delayed Signal Cancellation Filtering Theory
摘要
Abstract
Aimed at the problems of output current over-limit,distortion and power fluctuations in a traditional virtual synchronous generator(VSG)under conditions of unbalanced grid voltage and harmonic distortion,a low voltage ride-through control strategy for VSG based on fast delayed signal cancellation(FDSC)is proposed.First,according to the reasons for VSG output power fluctuations under unbalanced power grid,a unified expression of balanced current and constant active and reactive power is established,and an adjustment coefficient is introduced to realize the coordinated control of power and current.Second,FDSC is used for positive-and negative-sequence separation and harmonic sup-pression.In addition,by improving the reactive-voltage loop,adding virtual impedance and optimizing the power refer-ence instructions,this strategy can suppress overcurrent and provide voltage support.Simulation results show that the proposed strategy can realize coordinated fault ride-through of power and current under conditions of unbalanced grid voltage distortion,and it has advantages of small filtering delay in the positive-and negative-sequence separation link,high grid-connected current quality and good dynamic characteristics when the grid voltage drops and faults are re-moved.关键词
虚拟同步发电机/不平衡电网/谐波畸变/快速延时信号相消滤波/低电压穿越/协调控制Key words
virtual synchronous generator(VSG)/unbalanced power grid/harmonic distortion/fast delayed signal cancellation(FDSC)/low voltage ride-through/coordinated control分类
动力与电气工程引用本文复制引用
刘国帅,李希年,于慧皓..基于快速延时信号相消滤波理论的改进VSG低电压穿越策略[J].电力系统及其自动化学报,2025,37(4):98-106,9.基金项目
山东省自然科学基金资助项目(ZR2021ME236) （ZR2021ME236）
山东省博士后资助项目(SDCX-ZG-202303085). （SDCX-ZG-202303085）
