多馈入直流输电系统换相失败风险区域识别(二):换相失败风险量化评估及风险区域快速识别  

Risk Area Identification of Commutation Failure in Multi-infeed HVDC System(Part II):Quantitative Assessment of Commutation Failure Risk and Rapid Identification of Risk Area

作　　者：叶全 郭春义 YE Quan;GUO Chunyi(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2023年第23期8999-9009,共11页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2021YFB2400900)。

摘　　要：针对多馈入直流输电系统换相失败风险程度量化评估及风险区域快速识别的难题,该文研究多馈入直流输电系统换相失败的关键影响因素;然后,基于系列文章(1)的改进换相失败临界电压计算方法,并通过归一化思想,提出一种换相失败风险程度量化评估指标,其正负可用于判断不同直流子系统是否发生换相失败,其幅值大小可以反映当前状态至发生换相失败所需要的电压跌落幅度(幅值为负)或当前状态至不发生换相失败所需要的电压提升幅度(幅值为正);最后基于上述量化评估指标,提出不同故障严重程度下的换相失败风险区域快速识别方法。基于PSCAD/EMTDC搭建双馈入和三馈入直流输电系统模型,对换相失败风险程度评估结果和换相失败风险区域快速识别结果进行有效性验证。结果表明,提出的指标可用于量化评估多馈入直流输电系统换相失败的风险程度,且能够在不同故障严重程度下准确识别多馈入直流输电系统的换相失败风险区域。In order to solve the problems of quantitative assessment of commutation failure risk degree and rapid identification of risk areas in multi-infeed HVDC systems,the key factors affecting commutation failure of multi-infeed HVDC systems are studied in this paper.Then,based on the improved calculation method of critical voltage of commutation failure in part(I)and the idea of normalization,a quantitative evaluation index of commutation failure risk degree is proposed,which can be used to judge whether a commutation failure occurs in different DC subsystems by its positivity and negativity.Its amplitude can reflect the voltage drop from the current state to the commutation failure(negative amplitude)or the voltage rise required from the current state to the absence of commutation failure(positive amplitude).Finally,based on the quantitative evaluation index,a fast identification method of commutation failure risk area under different fault severity is proposed.Based on PSCAD/EMTDC,the dual-infeed and three-infeed HVDC system models are built to verify the effectiveness of the commutation failure risk degree assessment results and the rapid identification of commutation failure risk areas.The results show that the proposed index can be used to quantitatively evaluate the commutation failure risk degree of multi-infeed HVDC systems,and can accurately identify the commutation failure risk area of multi-infeed HVDC systems under different fault severity.

关 键 词：多馈入直流输电 换相失败风险 风险程度量化评估 风险区域识别 

分 类 号：TM73[电气工程—电力系统及自动化]