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华南理工大学电力学院,广东省广州市 510641
冯帅松(1998—),男,硕士研究生,主要研究方向:柔性直流输配电系统过电压、过电流及其防护。E-mail:303808443@qq.com
韩永霞(1982—),女,通信作者,教授,博士生导师,主要研究方向:直流输配电系统电磁暂态过程及其防护、电力系统防雷、大数据分析等。E-mail:epyxhan@scut.edu.cn
张杰(1993—),男,博士研究生,主要研究方向:电力系统过电压及防雷、压敏电阻冲击老化特性。E-mail:zjllshow@163.com
收稿:2022-05-05,
修回:2022-09-02,
网络出版:2023-01-30,
纸质出版:2023-03-10
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冯帅松,韩永霞,张杰等.不同拓扑柔性直流配电系统过电流理论计算方法适用范围[J].电力系统自动化,2023,47(5):162-170.
FENG Shuaisong,HAN Yongxia,ZHANG Jie,et al.Application Scope of Theoretical Overcurrent Calculation Methods for Flexible DC Distribution Systems with Different Topologies[J].Automation of Electric Power Systems,2023,47(5):162-170.
冯帅松,韩永霞,张杰等.不同拓扑柔性直流配电系统过电流理论计算方法适用范围[J].电力系统自动化,2023,47(5):162-170. DOI: 10.7500/AEPS20220505006.
FENG Shuaisong,HAN Yongxia,ZHANG Jie,et al.Application Scope of Theoretical Overcurrent Calculation Methods for Flexible DC Distribution Systems with Different Topologies[J].Automation of Electric Power Systems,2023,47(5):162-170. DOI: 10.7500/AEPS20220505006.
柔性直流配电系统是接入新能源、促进分布式能源发展的重要技术手段,其过电流计算是限流方案设计、设备选型、保护策略等的研究基础。具有普适性的精确理论计算方法可以简化和指导过电流的大量电磁暂态仿真。因此,文中开展了放射状和环状柔性直流配电系统极间短路故障下典型过电流理论计算方法的误差原因、影响因素和适用范围的系统性分析。首先,分别分析放射状柔性直流配电系统中过电流的解析计算方法和环状柔性直流配电系统中过电流的数值计算方法,提出了理论计算方法产生误差的根本原因是线路模型误差和公共线路耦合等。然后,在不同拓扑结构下,分析限流电抗器、线路型式及线路长度等因素对过电流理论计算误差的影响。最后,针对不同工况,提出了不同拓扑结构的柔性直流配电系统过电流理论计算方法的适用范围。
Flexible DC distribution system is an important technical mean to connect renewable energy and promote the development of distributed energy. Its overcurrent calculation is the basis of current limiting scheme design
equipment selection
protection strategy
etc. The accurate theoretical calculation method with universality can simplify and guide a large number of electromagnetic transient simulations of overcurrent. Therefore
a systematic analysis on the error causes
influencing factors and application scopes of the typical theoretical calculation methods of overcurrent in radial and circular flexible DC distribution systems under pole-to-pole short circuit faults is carried out in this paper. Firstly
the analytical calculation method of overcurrent in radial flexible DC distribution systems and the numerical calculation method of overcurrent in circular flexible DC distribution systems are analyzed
respectively. It is proposed that the fundamental causes of errors in theoretical calculation methods are line model errors and public line coupling. Then
with different topological structures
the influence of current limiting reactors
line type and line length on the theoretical calculation error of overcurrent is analyzed. Finally
for different operation conditions
the applicability of the theoretical calculation methods for overcurrent in flexible DC distribution systems with different topologies is proposed.
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