文章摘要
UPFC接入对线路变化量方向元件的影响
Impact of UPFC on transmission line variation direction elements
投稿时间:2019-10-18  修订日期:2019-11-30
DOI:
中文关键词: 统一潮流控制器  变化量方向元件  注入电压  灵敏性
英文关键词: unified power flow controller  fault components-based direction element  injection voltage  sensitivity
基金项目:
作者单位E-mail
黄涛 南京南瑞继保电气有限公司 huangtao4@nrec.com 
赵青春 南京南瑞继保电气有限公司  
谢 华 南京南瑞继保电气有限公司  
李奔 南京南瑞继保电气有限公司  
谈浩 南京南瑞继保电气有限公司  
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中文摘要:
      统一潮流控制器(UPFC)可以实现线路潮流的灵活控制,改善系统运行方式,但UPFC的接入改变了线路电压的均匀分布,也给继电保护带来了一些问题。结合故障后UPFC的控制保护逻辑,研究了UPFC注入电压的暂态变化特征,针对不同故障位置推导了注入电压变化对变化量方向元件的影响机理,分析了UPFC接入对不同变化量方向元件的影响程度,指出当保护安装处位于故障点与UPFC接入点之间或者UPFC本体故障时,正序变化量、工频变化量方向元件的灵敏性会大幅下降。基于苏州南部电网500kV UPFC工程实际模型及参数,搭建了计及UPFC控保逻辑的RTDS仿真模型,通过仿真试验对理论分析结论进行了充分验证。
英文摘要:
      Unified power flow controller (UPFC) can realize flexible control of transmission line power flow, and improve system operation mode. However, the access of UPFC changes the uniform distribution of line voltage and brings some prob-lems to relay protection. Based on the fault control and protection logic of UPFC, the transient variation characteristics of UPFC injection voltage are studied first in this paper. Then the influence mechanism and degree of injection voltage variation on fault components based directional elements are studied. It is pointed out that when the protection instal-lation is located between the fault point and the UPFC access point or the fault is located in UPFC body, the sensitivity of the direction element using positive sequence fault component and power frequency fault component will be greatly reduced. Based on the practical model and parameters of 500kV UPFC project in southern Suzhou grid, a RTDS simu-lation model contained UPFC control and protection logic is built. The theoretical analysis conclusions are fully verified by RTDS tests.
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