电力系统自动化2023，Vol.47Issue(24)：143-155,13.DOI:10.7500/AEPS20230227002
基于暂态特征分布的单端量后备保护自适应配合方案
Adaptive Coordination Scheme of Single-end Backup Protection Based on Transient Characteristic Distribution
摘要
Abstract
Single-end backup protection plays an important role in ensuring the safe operation of the distribution network.However,its setting task is heavy and it is difficult to adapt to the scenario of the random access of inverter-interfaced distributed generation(IIDG).Therefore,it is urgent to study an adaptive coordination scheme for backup protection that does not require step-by-step setting.A relay-type inverse-time backup protection scheme with"transient fault identification+steady-state operation discrimination"is proposed to address the issue of mal-operation/miss-operation in traditional stage coordination protection due to the limited short-circuit current during the steady-state stage of faults after the high proportion of renewable energy is connected.Firstly,the qualitative analysis is conducted and impedance characteristics are used to verify the transient characteristic distribution of the instantaneous real power of the fault component when the topology changes.Time-domain information within the minimum applicable frequency band with natural differences is extracted,and the transient energy of the unregulated phase of the converter is calculated.Secondly,the parameter selection principle for the unified inverse-time characteristic equation of the entire network is given to achieve the adaptive coordination between adjacent protections.Then,an action criterion based on steady-state voltage is constructed,and a single-end backup protection coordination scheme is obtained using the electrical quantities throughout the fault process.Finally,the simulation verifies the effectiveness of the proposed method with different topologies,distributed power capacity,and changes in accessing modes.关键词
后备保护/分布式电源/暂态/稳态/最小适用频带/反时限特性/自适应配合Key words
backup protection/distributed generator/transient/steady-state/minimum applicable frequency band/inverse-time characteristic/adaptive coordination引用本文复制引用
常娜娜,宋国兵,常仲学,张晨浩,郑玉平,吴通华..基于暂态特征分布的单端量后备保护自适应配合方案[J].电力系统自动化,2023,47(24):143-155,13.基金项目
国家电网公司科技项目(5108-202240278A-2-0-XG).This work is supported by State Grid Corporation of China(No.5108-202240278A-2-0-XG). （5108-202240278A-2-0-XG）
