电力系统保护与控制2025，Vol.53Issue(4)：120-131,12.DOI:10.19783/j.cnki.pspc.240572
风光火储打捆接入柔直交流侧送出线路故障特征分析
Fault characteristic analysis on the AC side of an MMC-HVDC transmission system connected to a wind-PV-thermal-energy storage system
摘要
Abstract
A wind-PV-thermal-energy storage system(WPTESS)is bundled and transmitted using AC collection,MMC-HVDC transmission,and AC grid connection.Among them,short-circuit faults at the AC sending line will generate new fault characteristics.Firstly,the fault current characteristics are analyzed by combining the fault ride-through control strategies of the WPTESS and MMC-HVDC.When the voltage drops to a range between 0.2 p.u.and 0.9 p.u.,the mechanism by which the fault current phase angle on both sides of the AC sending line is affected by the degree of voltage drop and the upper limit control of the amplitude limiting link is clarified through theoretical derivation.Using phasor analysis,it is revealed that the fault current phase angle on the WPTESS side is less than 75°,and on the MMC-HVDC side is less than 45°.The fault current amplitude characteristics under grounding faults and phase-to-phase faults are analyzed using fault sequence network.Secondly,considering the short-circuit ratio and using Thevenin's equivalent method,the reasons for the reduction of fault current phase angle due to the increase in system short-circuit capacity caused by thermal power integration are explored.In addition,the characteristics of the fault current amplitude of a wind-PV-energy storage system varying proportionally with input power are analyzed.Finally,the correctness of the theoretical analysis is verified through RTDS simulation.关键词
风光火储/柔性直流输电/跟网型/交流故障/故障特征分析Key words
wind-PV-thermal-storage system/MMC-HVDC/grid-following/AC fault/fault characteristics analysis引用本文复制引用
张圣,杨炳元,宫子媛,包红风..风光火储打捆接入柔直交流侧送出线路故障特征分析[J].电力系统保护与控制,2025,53(4):120-131,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.52367022). 国家自然科学基金项目资助(52367022) （No.52367022）
内蒙古自治区自然科学基金项目资助(2023LHMS05049) （2023LHMS05049）
