基于电流复平面的新能源送出线路差动保护适应性分析Adaptability analysis of differential protection for renewable energy outgoing lines based on current complex plane
于溯,周泽昕,王兴国
YU Su,ZHOU Zexin,WANG Xingguo
摘要(Abstract):
差动保护是新能源场站高压交流送出线路常配置的主保护,为全面评估新能源场站经高压交流线路送出场景下差动保护的适应性,提出一种基于电流复平面的工频差动保护适应性分析方法。利用电流复平面特性,将线路两侧故障电流幅值、相位、制动系数对保护适应性的影响解耦,定量分析了新能源电流幅值、相位受控特性对保护适应性的影响,并基于此给出了差动保护制动系数选取要求,为新能源并网工程中保护制动系数的整定提供参考。
Differential protection is a primary protection scheme commonly deployed for high-voltage AC outgoing lines connecting renewable energy power plants. To holistically evaluate its adaptability in such scenarios, this paper proposes an adaptability analysis method for power-frequency differential protection based on the current complex plane. By leveraging the characteristics of the current complex plane, the method decouples the influence of fault current magnitude, phase angle, and restraint coefficient from both line terminals on protection adaptability. It quantitatively analyzes how the current magnitude and controlled phase characteristics of renewable energy sources affect protection adaptability. Based on this analysis, requirements for selecting the restraint coefficient of differential protection are established, offering practical guidance for setting the protection restraint coefficient in renewable energy grid integration projects.
关键词(KeyWords):
新能源送出线路;差动保护;多因素耦合;电流复平面
renewable energy outgoing lines;differential protection;multi-factor coupling;current complex plane
基金项目(Foundation): 国家自然科学基金联合基金项目(U2166205)
作者(Author):
于溯,周泽昕,王兴国
YU Su,ZHOU Zexin,WANG Xingguo
DOI: 10.19585/j.zjdl.202508007
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