中国电机工程学报2024，Vol.44Issue(7)：2801-2814,后插23,15.DOI:10.13334/j.0258-8013.pcsee.230091
考虑工作点时变特性的并网变流器全工作区间稳定性分析
Full Working Area Stability Analysis of Grid-connected Converters Considering Time-varying Characteristics of Operating Points
摘要
Abstract
The existing project operation data shows that the dynamic characteristics of grid-connected converters(GCC)are closely related to the operating points.Due to the influence of external factors such as new energy output fluctuation and load throwing,the operating points of the converter show random time-varying characteristics.Therefore,it is important to analyze the system stability at all operating points in the whole operating interval.Conventional impedance/conductance analysis method can effectively analyze the stability of GCCs when they operate at specific operating points,but when all possible operating points of the system are considered,the analysis needs to be repeated several times,which is a large and difficult task.To solve this challenge,a multivariate modeling approach considering the operating points variables is proposed.The operating points variables are introduced into the conductance model,and the multivariate single input single output(SISO)model of the GCC is established through the control loop reconstruction.The proposed model directly includes the operating points variables,and thus can effectively analyze the dynamic characteristics of the converter in the full operating interval.In addition,a stability analysis method based on the safe operation region is proposed to realize the intuitive characterization of the system stability in the multidimensional operating interval by considering the maximum transmission limit and dynamic characteristics of the converter.Simulations and experiments validate the correctness of the proposed multivariate SISO model and the analysis method based on the safe operation region.The proposed method has wide application potential in engineering scenarios such as analyzing the operation limits of power electronic equipment,guiding converter design and assisting power devices to play the extreme performance.关键词
并网变流器/工作点/多变量单输入单输出模型/安全运行域/时变系统/全工作区间稳定性Key words
grid-connected converters(GCC)/operating points/multivariate single input single output(SISO)model/safe operation region/time-varying systems/full operating interval stability分类
信息技术与安全科学引用本文复制引用
谢伟杰,肖凡,涂春鸣,郑宇婷,肖泽坤,郭祺,葛平娟..考虑工作点时变特性的并网变流器全工作区间稳定性分析[J].中国电机工程学报,2024,44(7):2801-2814,后插23,15.基金项目
国家自然科学基金(重点项目)(52130704) （重点项目）
国家自然科学基金(面上项目)(52077072).Project Supported by National Natural Science Foundation of China(Key Program)(52130704) （面上项目）
National Natural Science Foundation of China(General Program)(52077072). （General Program）
