电网技术Issue(11)：3185-3192,8.DOI:10.13335/j.1000-3673.pst.2014.11.036
不受电容式电压互感器暂态特性影响的距离保护
A Distance Protection Scheme Not Affected by Transient Characteristic of Capacitor Voltage Transformer for HV Long Transmission Line
摘要
Abstract
Affected by transient characteristic of capacitor voltage transformer (CVT), the distance protection for HV transmission line is easily to mal-operate due to transient overreach, thus the secure and stable operation of power grid is affected. A new distance protection scheme that is not affected by the transient characteristics of CVT is proposed and its principle is as following:firstly, on the basis that the CVT can transmit and transform power frequency phasor, by means of the matrix pencil based accurate power frequency phasor extraction method the power frequency phasors of voltage and current at the position where the protection is installed are calculated;secondly, the voltage and current at the position of the long distance transmission line, where the protection is set, are calculated by Bergeron model; finally, coordinating with directional element and taking the setting point as the observation point, the fault point is located by traditional distance protection algorithm. The proposed principle is not affected by transient characteristic of CVT and the impacts of distributed parameters of the long distance transmission line are taken into account, thus the proposed distance protection scheme possesses a better performance, and the effectiveness of the proposed algorithm is validated by simulation results.关键词
电容式电压互感器(CVT)/暂态特性/距离保护/准确工频量提取算法Key words
capacitor voltage transformer/transient characteristic/distance protection/accurate power frequency phasor extraction algorithm分类
信息技术与安全科学引用本文复制引用
焦在滨,齐倩,杨黎明,王优胤,宁荣..不受电容式电压互感器暂态特性影响的距离保护[J].电网技术,2014,(11):3185-3192,8.基金项目
国家自然科学基金资助项目(51037005)。Project Supported by National Natural Science Foundation of China(NSFC)(51037005) （51037005）
