接地极引线环流导致站内接地过流保护动作案例分析  

Case analysis of station ground overcurrent protection acting caused by circulation current of electrode line

作　　者：李林[1] 付广旭 龚飞 赵森林[1] Li Lin;Fu Guangxu;Gong Fei;Zhao Senlin(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2020年第8期118-124,共7页Electrical Engineering

摘　　要：在巴西美丽山Ⅱ期直流实时数字仿真系统上,开展站内接地过流试验,站内接地过流保护动作,导致直流双极闭锁。首先,对试验波形以及直流电流回路进行了分析,指出接地极引线环流是造成保护动作的直接原因;然后,建立了环流回路模型,利用曲线拟合验证了所建立环流回路模型的正确性,并给出了环流回路中储能元件的拟合数值;接着,分析指出实时数字仿真模型中的接地极引线的电导率参数是决定接地极引线对地等效电容大小的主要因素,并且导致了接地极引线环流的产生;最后,通过对模型中的接地极引线电导率参数合理设置,使站内接地过流保护试验达到预期结果。分析结论对高压直流输电工程实时数字仿真建模和试验具有一定的借鉴意义。The station ground overcurrent protection acting occurred in the station grounding overcurrent test on Belo Monte II HVDC RTDS simulation system.Firstly,the test waveform and the HVDC current circuit are analyzed,and it is pointed out that the grounding electrode line circulating current is the direct cause of protection acting.Secondly,the circulating current circuit model is established,and the correctness of the circulating current circuit model is verified by curve fitting,and the fitting value of the energy storage component in the circulating current circuit is given.Further,it is pointed out that the conductance of grounding wire in RTDS model affects the capacitance coupled into the circuit,which leads to the generation of grounding electrode line circulating current.Finally,the conductance of grounding electrode line in RTDS model is set reasonably,which makes the station ground overcurrent protection test achieve the expected results.The analysis conclusion has the certain reference significance for HVDC experiments based on RTDS simulation system.

关 键 词：直流输电 站内接地 过流保护 接地极引线环流 

分 类 号：TM721.1[电气工程—电力系统及自动化]