摘要
传统二阶广义积分器(SOGI)的方法可实现α、β分量的提取,但在电网电压不平衡且含有谐波分量、直流分量的情况下,SOGI的提取精度降低,直接影响对基波正序有功、无功电流的检测。为提高传统SOGI的抗直流偏移干扰能力,提出一种基于改进的SOGI的三相电流正序、负序提取算法,不仅消除了三相电压不平衡以及谐波分量对电流的影响,同时消除网侧直流分量影响。仿真结果验证了所提方法的有效性。
Traditional second-order generalized integrator(SOGI)can realize extraction ofαandβcomponents.However,when the grid voltage is not balanced and contains harmonic and DC components,SOGI can only achieve a lower extraction accuracy,thus directly affecting detection of fundamental positive sequence active and reactive currents.In order to improve resistance of traditional SOGI against DC offset jamming,a three-phase current positive and negative sequence extraction algorithm based on modified SOGI was proposed,and it could not only eliminate the influence produced by three-phase voltage imbalance and harmonic component on current,but also remove the impact of the DC component on the network side.Simulation results showed the effectiveness of the proposed approach.
作者
韦婷
黄彦全
李辉
宋智威
Wei Ting;Huang Yanquan;Li Hui;Song Zhiwei(College of Electrical Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《电气自动化》
2020年第1期33-36,共4页
Electrical Automation
关键词
改进的SOGI
谐波
直流偏移
正负序分离
基波正序电流
modified second-order generalized integrator(SOGI)
harmonic
DC offset
positive and negative sequence separation
fundamental positive sequence current
