Transient Current Estimation of MMC-HVDC Systems Under a Grid-converter Phase Difference
作者机构：School of Electrical Engineering and AutomationWuhan UniversityWuhanChina School of ElectricalElectronic and Computer EngineeringThe University of Western AustraliaWestern AustraliaAustralia
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4期
页 面：730-743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：supported by the National Natural Science Foundation of China under Grants 51877159,51637007 the Fundamental Research Funds for Central Universities Program 2042019kf0195
主 题：Index Terms-Frequency disturbance phase difference MMC-HVDC stability analysis transient current
摘 要：When a modular multilevel converter based high voltage direct current(MMC-HVDC)system operates under grid faults,there will be a phase difference between the grid voltage and the converter *** can be caused by grid voltage phase shifting and the integration effect of the phase-locked loop(PLL)in the *** system may exhibit an undesirable transient process with expanded current which is harmful for the converter *** this paper,a transient current estimation method is proposed for the scenario of converter-grid phase difference caused by the frequency shifting of the grid side.A piecewise phase calculation model is established to determine the transient phase difference of the ***,according to the maximum phase difference calculated by the model,the system stability is assessed and the maximum value of system transient current can be estimated after comparing the maximum phase difference with the critical phase difference and π,Finally,the current estimation results are verified by detailed circuit simulations of a 21-level MMC-HVDC system built in PSCAD.
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