摘要
快速准确地获取电网或者逆变器输出波形中的谐波分量,对逆变器控制和谐波补偿具有重要意义,而以往常采用的二阶广义积分器SOGI(second-order generalized integrator)方法存在离散过程中出现谐振点偏移,影响分离提取精度的问题。为此提出了1种能够快速精确地分离提取谐波的无稳态误差谐波观测器HEO(harmonic extraction observer)技术,其实现过程可以直接等效为1组二阶差分方程,结构简洁,易于数字实现。另外,详细分析了所提HEO的原理和性能,并与传统SOGI方法进行了性能对比。同时,为了解决多种谐波观测过程中存在相互干扰的现象,在所提HEO的基础上,提出了交叉抑制性结构改进型HEO方法,详细讨论了其实现原理和结构。最后,单相系统的仿真和实验结果表明,谐波观测器能够快速精确地分离提取单相系统中的基波及各次谐波分量,具有响应速度快、观测偏差小的优势。
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.
作者
蔡永翔
王扬
李巍
欧阳广泽
白浩
何肖蒙
CAI Yongxiang;WANG Yang;LI Wei;OUYANG Guangze;BAI Hao;HE Xiaomeng(Electric Power Research Institute,Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou 510663,China;Guiyang Power Supply Company,Guizhou Power Grid Co.,Ltd.,Guiyang 550004,China)
出处
《电源学报》
北大核心
2025年第7期55-64,共10页
Journal of Power Supply
基金
贵州省科技支撑计划资助项目(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)。
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
Harmonic extraction observer(HEO)
Bode plot
second-order generalized integrator(SOGI)
cross-suppressed structure
harmonic separation
