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Fundamental Research of Power System Protection by applying Zone-Tune-Up Estimation Theory

应用区域调整估计理论进行电力系统继电保护基础研究

基本信息

批准号：
60550189
负责人：
TOYODA Junichi
金额：
$ 1.28万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550189/
关键词：
Power system protection Digital protection system Transient harmonics Apparent impedance 距離継電方式

项目摘要

The purpose of this research is to develop the efficient estimation technique to eliminate the specified non-integer-harmonics (for instance, 3.7 harmonics and so on) with exponentially decay, which is included in the measured signal of the digital relaying system. Transient distortion of the signals becomes more severe with increase in the quantity of reactive compensation sources which usually increases with the size of EHV systems. Therefore, it becomes serious problem to estimate fundamental frequency component from the highly distorted measurement and to identify the fault location precisely in digital distance relay.Proposed algorithm in this research is based on the non-recursive type filter of which the coefficients are determined by minimizing the residue under the constraints, so-called 'vectorchain-rule'. 'Vector-chain-rule' is a phaser relation existing between the sequential sample data of exponentially decayed sinusoidal signal, which is newly introduced in this research. On the other hand, the frequency of transient harmonics depends on the location of fault. Therefore, the filter coefficient should be so carefully selected as the best identification of fault location is achieved around the boundary of protective zone. In other words, the filter coefficients should be tuned up the frequency of the transient hamonics at the protective zone. This zone-tune-up estimation technique is tested by using simulation model of EHV system. Result is compared with result by DFT (discrete Fourier transformation). When the measured data contains decayed transient component, the proposed algorithm shows excellent discriminative ability. The concept of surface protection for the grid-network system has been surveyed. The new idea is proposed for two-dementional identification of the fault location.

本研究的目的是开发一种有效的估计技术来消除数字继电保护系统测量信号中包含的特定的具有指数衰减的非整数次谐波(如3.7次谐波等)。信号的暂态失真随着无功补偿源数量的增加而变得更加严重，这种情况通常随着超高压系统的规模而增加。因此，如何从严重失真的量测数据中估计出基频分量，准确地识别出故障位置，成为数字式距离保护中亟待解决的问题。本文提出的算法是基于约束条件下，通过最小化残差来确定系数的非递归型滤波器，即所谓的矢量链规则。“矢量链规则”是指数衰减正弦信号序列样本数据之间存在的一种相量关系，是本研究中新引入的。另一方面，暂态谐波的频率取决于故障的位置。因此，应慎重选择滤波系数，以实现对保护区域边界附近故障位置的最佳识别。换言之，滤波系数应调高保护区内暂态谐振子的频率。利用超高压系统的仿真模型对该区域调谐估计技术进行了验证。将计算结果与离散傅立叶变换(DFT)结果进行了比较。当测量数据中含有衰减的暂态分量时，该算法表现出了很好的识别能力。概述了电网系统表面防护的概念。提出了二维故障定位识别的新思路。