电压源型变流器并网系统多时间尺度间相互作用  

The Interaction Between Multiple Timescales of the Grid-Tied Voltage Source Converter

作　　者：杜步阳 邵德军 朱建行 石梦璇 徐友平 Du Buyang;Shao Dejun;Zhu Jianhang;Shi Mengxuan;Xu Youping(State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China;Central China Branch of State Grid Corporation of China,Wuhan 430077 China)

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074 [2]国家电网有限公司华中分部,武汉430077

出　　处：《电工技术学报》2023年第20期5547-5559,共13页Transactions of China Electrotechnical Society

基　　金：国家电网有限公司科技资助项目(5214DK210010)。

摘　　要：电压源型变流器(VSC)的控制环节及其与网络间的相互作用是造成VSC并网系统失稳的重要因素。而VSC的控制具有多时间尺度特征,具体可划分为直流电压控制(DVC)时间尺度和交流电流控制(ACC)时间尺度。现有文献大多仅针对单一时间尺度的稳定性问题开展研究,对于多时间尺度环节间的相互作用则鲜有涉及。对此,该文基于模式分析方法,提出衡量多时间尺度间相互作用的量化指标,揭示多时间尺度间相互作用随锁相环带宽和系统短路比的变化规律。进而通过对比不同时间尺度模型的阻尼比和振荡频率,明确多时间尺度间相互作用对系统稳定性分析结果的影响。最后探讨DVC、ACC时间尺度模型的适用范围,并从物理角度对分析结果进行初步阐释。The voltage source converter's(VSC)control system and its interactions with the network are important factors that cause the instability of the grid-tied VSC.The control of VSC has a multiple timescale feature,which can be divided into DC-link voltage control(DVC)timescale and alternating current control(ACC)timescale.Existing research focuses on stability in a single timescale and rarely deals with the interaction between multiple timescales.Therefore,this paper uses the modal analysis to investigate the quantitative indicators and influencing factors of the interaction between different timescales of the grid-tied VSC.At the same time,the applicable scope of the models in DVC and ACC timescales is clarified,and the analysis results are preliminarily explained from a physical point of view.First,this paper briefly introduces the topology and control scheme of the grid-tied VSC and illustrates its multiple timescale dynamic characteristics.Next,the small-signal models of the grid-tied VSC in multiple timescales,DVC timescales,and ACC timescales are constructed.The accuracy of the above models is verified by the electromagnetic transient simulation and eigenvalue analysis.The participation factors for state variables and modes in different timescales are used based on the modal analysis method to measure the relative strength of the interaction between different timescales.The interaction variation between different timescales with the bandwidth of the phase-locked loop(PLL)and the short circuit ratio(SCR)is analyzed.By comparing the eigenvalue damping ratios and oscillation frequencies of the grid-tied VSC models in multiple timescales,DVC timescale,and ACC timescale,this paper shows that the interaction between multiple timescales has an impact on the system stability analysis results.Then,the deviations of eigenvalue damping ratios and oscillation frequencies of the DVC or ACC timescale models are analyzed when the PLL bandwidth and SCR vary.The applicable scope of the above models in a single timescale is clar

关 键 词：电压源型变流器 多时间尺度 直流电压控制(DVC)时间尺度 交流电流控制 (ACC)时间尺度 相互作用 模式分析 

分 类 号：TM712[电气工程—电力系统及自动化]