多逆变器并网系统多谐波建模及谐波交互分析  

Multiple Harmonic Modeling and Harmonic Interaction Analysis of Multi-inverter Grid-connected System

作　　者：戴烨敏 李育坤 林顺富 边晓燕 李东东 DAI Yemin;LI Yukun;LIN Shunfu;BIAN Xiaoyan;LI Dongdong(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学电力工程学院,上海200090

出　　处：《电气传动》2022年第14期25-31,共7页Electric Drive

基　　金：国家自然科学基金(51977127);上海市科学技术委员会资助项目(19020500800);上海市教育发展基金会和上海市教育委员会“曙光计划”(20SG52)。

摘　　要：随着新能源并网技术的广泛应用,大量电力电子装置接入电网,其谐波交互问题对并网电能质量造成了一定的影响。针对多逆变器并网系统的谐波交互问题,采用多输入多输出模型对谐波耦合特性进行分析。首先,通过逆变器的小信号方程和谐波状态空间(HSS)理论对多个并联的三相LCL型并网逆变器系统进行建模。其次,基于多逆变器的HSS模型推导谐波耦合系数理论方程,并绘制谐波分量的耦合关系图,从而分析多逆变器并网系统中的谐波耦合特性,即交流侧和直流侧的各个频次谐波间的谐波耦合过程。最后,通过在多种工况下的仿真实验以及RTLAB实验与HSS模型结果进行对比验证数学模型的有效性。With the wide application of new energy grid connection technology,a large number of power electronic devices are connected to the power grid,and the power quality is affected by harmonic interaction. Aiming at the harmonic interaction problem of multi-inverter grid-connected system,the multi-input and multi-output model was used to analyze the harmonic coupling characteristics. Firstly,the model of several parallel three-phase LCL gridconnected inverter systems which is based on the small signal equation of the inverter and the harmonic state space(HSS)theory was built. Secondly,the theoretical equation of harmonic coupling coefficient was derived by the HSS model of multiple inverters,and the coupling diagram of harmonic components was drawn,so as to analyze the harmonic coupling characteristics in the grid-connected system of multiple inverters,that is,the transfer process of each harmonic between the AC side and the DC side. Finally,the effectiveness of the mathematical model was verified by contrasting the results of HSS model with the results of simulation experiments and RTLAB experiment.

关 键 词：谐波状态空间 谐波交互 LCL并网逆变器 直流电压扰动 

分 类 号：TM464[电气工程—电器]