利用模量模型识别的VSC-HVDC输电线路纵联保护新原理

发布时间：2018-01-21 00:26

本文关键词： 电压源换流器型高压直流直流输电线路模型识别相关系数纵联保护　出处：《电力系统自动化》2014年10期 　论文类型：期刊论文

【摘要】：电压源换流器型高压直流(VSC-HVDC)输电控制系统复杂,故障承受能力差,线路保护装置动作正确率不高。文中提出了一种利用模量模型识别的VSC-HVDC输电线路纵联保护新原理。该原理将区外故障等效为正的电容模型,差动电流和差动电压导数相关系数为1;将区内故障等效为负的电容模型,差动电流和差动电压导数相关系数为-1。通过判别相关系数的正负,即可区分区内、区外故障。在实际运行中,VSC-HVDC输电系统多为双极运行,为降低极间电磁耦合的影响,采用了1模和0模量构成判据。理论分析和PSCAD仿真实验表明,新原理无需补偿输电线路电容电流,原理简单、易于整定,不受过渡电阻和控制特性的影响,在各种工况下均能快速可靠地区分区内、区外故障。
[Abstract]:The VSC-HVDC (Voltage Source Converter) transmission control system is complex and its fault bearing capacity is poor. This paper presents a new principle of VSC-HVDC transmission line longitudinal protection based on modulus model, which equates the fault out of the area to a positive capacitance model. The correlation coefficient of differential current and differential voltage derivative is 1; The differential current and differential voltage derivative correlation coefficient is -1. By discriminating the positive and negative correlation coefficients, the faults in and out of the region can be distinguished. In order to reduce the effect of electromagnetic coupling between poles, the criterion of 1 mode and 0 modulus is adopted in VSC-HVDC transmission system. The theoretical analysis and PSCAD simulation show that the criterion can be used to reduce the effect of electromagnetic coupling between poles. The new principle does not need to compensate the capacitive current of the transmission line. The principle is simple and easy to set, and it is not affected by the transition resistance and control characteristics. It can quickly and reliably fault in and out of the area under various working conditions.
【作者单位】：西安交通大学电气工程学院;国网安徽省电力公司经济技术研究院;国网重庆市电力公司江北供电分公司;
【基金】：国家自然科学基金资助项目(51037005,51177128) 教育部博士点基金资助项目(20110201110056)~~
【分类号】：TM721.1
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