电源学报2025，Vol.23Issue(7)：55-64,10.DOI:10.13234/j.issn.2095-2805.2025.7.55
一种无静差单相谐波观测器
Non-static Error Single-phase Harmonic Extraction Observer
摘要
Abstract
The rapid and accurate acquisition of harmonic components in the output waveforms from power grid or inverters is of significance for inverter control and harmonic compensation.However,the commonly used method of second-order generalized integrator(SOGI)suffers from the problem of resonance point offset during the discretization process,which affects the separation and extraction accuracy.To solve this question,a technique of non-static error harmonic extraction observer(HEO)which can rapidly and accurately separate and extract harmonics is proposed,whose implementation process can be directly equated to a set of second-order difference equations with a simple structure and easy digital implementation.The principle and performance of the proposed HEO are analyzed in detail,and its performance is compared with that of the conventional SOGI method.Meanwhile,in order to avoid the phenomenon of mutual interference during the observation of multiple harmonics,a cross-suppressed modified HEO method is further put forward,and the corresponding implementation principle and structure are discussed in depth.Finally,the simulation and experimental results of a single-phase system show that the proposed HEO can quickly and accurately separate and extract the fundamental wave and each harmonic component in the single-phase system,with advan-tages of fast response and small observation deviation.关键词
谐波观测器/伯德图/二阶广义积分/交叉抑制结构/谐波分离Key words
Harmonic extraction observer(HEO)/Bode plot/second-order generalized integrator(SOGI)/cross-suppressed structure/harmonic separation分类
信息技术与安全科学引用本文复制引用
蔡永翔,王扬,李巍,欧阳广泽,白浩,何肖蒙..一种无静差单相谐波观测器[J].电源学报,2025,23(7):55-64,10.基金项目
贵州省科技支撑计划资助项目(黔科合支撑[2022]一般012) （黔科合支撑[2022]一般012）
中国南方电网公司重点科技资助项目(GZKJXM20220043)This work is supported by Guizhou Provincial Science and Technology Projects under the grant[2022]General 012 （GZKJXM20220043）
Key Science and Technology Projects of China Southern Power Grid Corporation under the grant GZKJXM20220043 （）
