文章摘要
顾乔根,张晓宇,文继锋,等.UPFC串联变压器匝间故障特性分析[J].电力系统自动化. DOI: 10.7500/AEPS20171211001.
GuQiaogen,ZhangXiaoyu,WenJifeng, et al.Analysis of Interturn Fault of UPFC Series Transformer[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20171211001.
UPFC串联变压器匝间故障特性分析
Analysis of Interturn Fault of UPFC Series Transformer
DOI:10.7500/AEPS20171211001
关键词: UPFC,串联变压器  差动保护  电压调整  匝间故障
KeyWords: UPFC, Series  transformer,Differential  protection,Voltage  adjustment, Interturn  fault
上网日期:2018-11-08
基金项目:
作者单位E-mail
顾乔根 南京南瑞继保电气有限公司 guqg@nrec.com 
张晓宇 南京南瑞继保电气有限公司 zhangxiaoyu@nrec.com 
文继锋 南京南瑞继保电气有限公司 wenjf@nrec.com 
莫品豪 南京南瑞继保电气有限公司 moph@nrec.com 
郑超 南京南瑞继保电气有限公司 zhengc@nrec.com 
龚啸 南京南瑞继保电气有限公司 gongx@nrec.com 
摘要:
      串联变压器是统一潮流控制器(UPFC)的核心器件之一,其工作电压通常小于其额定电压。由于串联变压器特殊的运行特性,纵差保护反映串联变压器的匝间故障的灵敏度大为降低。本文从继电保护角度出发,分析了UPFC串联型变压器匝间短路时影响差流的相关因素,找到了造成差动保护灵敏度降低的原因。并由此引入电压调整系数,调整差动计算中的变压器二次额定电流计算值。论文分析了引入电压调整系数后,对差动保护的影响;同时给出了电压调整系数取值时需要注意的问题。最后以实际工程为例建立仿真模型,从保护灵敏度和防误动特性两方面,对本文所述方法进行了验证
Abstract:
      Series transformer is one of the core components of UPFC. Its operating voltage is usually less than its rated voltage . Due to the special operation characteristics of the series transformer, the sensitivity of differential protection to reflect the interturn fault of the series transformer is greatly reduced.From the point of view of relay protection, this paper analyzes the related factors affecting the difference current when the UPFC series transformer interturn short circuit is short circuited,and founds the reasons for reducing the sensitivity of the differential protection . The voltage adjustment coefficient is introduced to adjust the calculated value of the second rating current of the transformer in the differential calculation. In this paper, the influence of voltage adjustment coefficient on differential protection is analyzed. At the same time, attention points are given to determine the value of voltage adjustment coefficient. At last, the simulation model is set up with the actual project as an example. The method is verified by two aspects of improving the protection sensitivity and the anti misoperation characteristics.
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