Nyquist Stability Analysis and Capacitance Selection for DC Current Flow Controllers in Meshed Multi-terminal HVDC Grids
作者机构：School of AutomationNanjing University of Science&Technology(NUST)Nanjing 210094China School of EngineeringUniversity of BirminghamEdgbastonBirmingham B152TTUnited Kingdom
出 版 物：《CSEE Journal of Power and Energy Systems》 (中国电机工程学会电力与能源系统学报（英文）)
年 卷 期：2021年第7卷第1期
页 面：114-127页
核心收录：
学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学]
基 金：National Natural Science Foundation of China under Grant 51807091 Natural Science Foundation of Jiangsu Province BK20180478 the China Postdoctoral Science Foundation under Grant 2019M661846 EPSRC under Grant EP/N032888/1
主 题：Capacitance selection method control ranges DC current flow controller(CFC) meshed multi-terminal HVDC(M2TDC)grid Nyquist stability analysis small-signal modelling switching frequencies
摘 要：Controllability of DC current/power flow is essentialin multi-terminal HVDC (MTDC) grids, particularly for theMTDC grids in a meshed topology. In this paper, consideringmeshed MTDC (M2TDC) grids with the installation of twoline/multi-lineDC current flow controllers (CFCs), a small-signalmodel of the DC CFCs integrated M2TDC grids is derived,studying the impact of the power losses of the DC CFC andtheir influence on the analysis of energy exchanges. The systemstability analysis is analysed using the Nyquist diagram, which ismore suitable for analyzing complex nonlinear systems with morecompact and reliable indicators of stability in comparison withgain/phase margins shown in the Bode diagram. In addition, aselection method of the interconnected capacitor of the DC CFCis proposed under different operating conditions. The impact ofthe switching frequencies of the DC CFC on the control ranges ofthe DC current flows is analyzed. The effectiveness of the Nyquistanalysis and the capacitance selection method is verified bysimulation studies using PSCAD/EMTDC. The obtained control ranges of the DC CFC with different switching frequenciesand capacitances would be useful for practical engineeringapplications.
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