电力系统保护与控制2026，Vol.54Issue(11)：1-13,13.DOI:10.19783/j.cnki.pspc.251324
柔直构网的100％新能源基地送出线路的故障特性重塑策略
Fault characteristics reshaping strategy for outgoing lines of 100％renewable energy bases grid-formed by MMC-HVDC
摘要
Abstract
Large-scale renewable energy bases located in deserts,the Gobi,and other arid regions often lack synchronous generation support and therefore adopt grid-forming modular multilevel converter-based high voltage direct current(MMC-HVDC)transmission schemes.In such systems,an isolated AC grid with 100％renewable energy and full power electronics is formed at the sending end.When faults occur on the outgoing AC lines,severe transient fluctuations significantly degrade the reliability of AC line protection.To address this issue,a fault characteristic reshaping strategy is proposed from the perspective of control-protection coordination to enhance protection reliability.First,the mechanism of fault transient fluctuations under conventional control schemes and its correlation with the degradation of protection performance are analyzed.Then,through theoretical derivation,a sliding mode control-based inner-loop controller for negative-sequence current is designed to replace the conventional proportional-integral controller,along with a fast transient response strategy.Finally,an electromagnetic transient simulation model of the sending-end grid of a renewable energy base with grid-forming MMC-HVDC is established in PSCAD/EMTDC.Simulation results verify that the proposed fault characteristic reshaping strategy can effectively suppress transient current fluctuations,thereby enhancing protection reliability.关键词
柔直/构网/控保协同/故障特性重塑/负序电流控制/滑模控制/交流线路保护Key words
MMC-HVDC/grid-forming/control-protection coordination/fault characteristic reshaping/negative-sequence current control/sliding mode control/AC line protection引用本文复制引用
李岩,仲思为,曹润彬,彭发喜,黄伟煌,周永智..柔直构网的100％新能源基地送出线路的故障特性重塑策略[J].电力系统保护与控制,2026,54(11):1-13,13.基金项目
This work is supported by the Joint Fund Key Support Projects of National Natural Science Foundation of China(No.U23B20112). 国家自然科学基金联合基金重点支持项目资助(U23B20112) （No.U23B20112）
