中国电力2024，Vol.57Issue(5)：211-221,11.DOI:10.11930/j.issn.1004-9649.202304066
大规模新能源接入弱同步支撑柔直系统的送端自适应VSG控制策略
Adaptive VSG Control Strategy of Sending End for Large-Scale Renewable Energy Connected to Weakly-Synchronized Support VSC-HVDC System
摘要
Abstract
Renewable energy collection and output through voltage source converter based high voltage direct current(VSC-HVDC)technology is an effective way to promote renewable energy consumption.However,the continuous increase in the penetration rate of renewable energy has led to a continuous decline in the strength of the power grid,and the traditional grid-following(GFL)converter technology can no longer meet the needs of stable system operation.In order to improve the adaptability of the weak grid of the system and meet the application scenarios of large-scale renewable energy connected to weakly-synchronized support VSC-HVDC system,this paper proposes to adopt VSG control strategy in the converter station of the sending end of the VSC-HVDC system.Firstly,a small signal mathematical model of rectifier-side control is established,and the influence of virtual impedance on system stability is studied by the root locus method.Secondly,an improved virtual synchronous generator(VSG)control algorithm for constructing virtual reactance adaptive adjustment items using electrical quantities such as alternating voltage(AC)change rate and voltage difference is proposed,which can improve the equivalent short-circuit ratio of the AC system at the sending end while ensuring that the equivalent impedance of the system is inductive,so as to improve the overall performance of the system.Finally,the effectiveness of the proposed control strategy is verified by PSCAD/EMTDC electromagnetic transient simulation.关键词
新能源发电/弱交流电网/柔性直流系统/虚拟同步发电机/自适应算法Key words
renewable energy power generation/weak AC power grid/VSC-HVDC system/virtual synchronous generator/adaptive algorithm引用本文复制引用
朱子民,张锦芳,常清,周专,张晓林..大规模新能源接入弱同步支撑柔直系统的送端自适应VSG控制策略[J].中国电力,2024,57(5):211-221,11.基金项目
国网新疆电力有限公司技术服务项目(孤岛柔直发展路径研究,302253-9001005-0101). This work is supported by Technical Service Project of State Grid Xinjiang Electric Power Co.,Ltd.(Research on the Development Path of Island VSC-HVDC,No.302253-9001005-0101). （孤岛柔直发展路径研究,302253-9001005-0101）
