基于MATLAB仿真的微机保护算法分析  

Analysis of Microcomputer Protection Algorithm Based on MATLAB Simulation

作　　者：施泽京 胡水林 郝晓红[1] 许磊 范俊飞 SHI Zejing;HU Shuilin;HAO Xiaohong;XU Lei;FAN Junfei(University of Electronic Science and Technology of China,Chengdu 611731,China;Guangxi Chengdian Intelligent Manufacturing Technology Co.,Ltd.,Liuzhou 545007,China;Liuzhou Jinjing Electric Appliance Co.,Ltd.,Liuzhou 545001,China)

机构地区：[1]电子科技大学,四川成都611731 [2]广西成电智能制造产业技术有限责任公司,广西柳州545007 [3]柳州津晶电器有限公司,广西柳州545001

出　　处：《电工技术》2023年第16期99-101,共3页Electric Engineering

摘　　要：电力系统发生短路时故障电流中产生了非周期的衰减直流分量,全波傅氏算法无法将其滤除。对此提出一种全波傅氏改进算法,完全基于故障信号一个半周期的采样值计算衰减直流分量,在故障信号采样值中减去衰减直流分量的离散采样值,再通过全波傅氏算法计算基波幅值和相角。MATLAB/Simulink仿真结果表明改进算法能有效滤除衰减直流分量,与全波傅氏算法相比速度有所降低,但是计算精度得到了有效提高,更易于微机实现且步骤简单。When a short circuit occurs in a power system,the fault current generates an aperiodic decaying DC component which cannot be removed by the full-wave Fourier algorithm.In this paper,an improved full-wave Fourier algorithm is proposed.The attenuated DC component is calculated based on the sampling value of one and a half cycles of the fault signal,the discrete sampling value of the attenuated DC component is subtracted from the sampling value of the fault signal,and then the fundamental amplitude and phase angle are calculated by the full-wave Fourier algorithm.The MATLAB/Simulink simulation results show that the improved algorithm can effectively filter out the attenuating DC component,and the speed is reduced compared with the full-wave Fourier algorithm,but the calculation accuracy is effectively improved and it is easier for microcomputer implementation and simple steps.

关 键 词：衰减直流分量 全波傅氏算法 微机保护 

分 类 号：TM774[电气工程—电力系统及自动化]