计及背景谐波的LCL型并网逆变器谐振抑制策略  

Resonance suppression strategy for LCL-type grid connected inverters considering background harmonics

作　　者：赵欣宇 龚立娇[1,2] 张新 姜三涛 ZHAO Xinyu;GONG Lijiao;ZHANG Xin;JIANG Santao(College of Mechanical and Electrical Engineering,Shihezi University,Shihezi,Xinjiang 832003,China;Key Laboratory of Advanced Energy Storage Materials and Technology Corps,Shihezi,Xinjiang 832003,China)

机构地区：[1]石河子大学机械电气工程学院,新疆石河子832003 [2]先进储能材料与技术兵团重点实验室,新疆石河子832003

出　　处：《石河子大学学报（自然科学版）》2024年第5期538-544,共7页Journal of Shihezi University(Natural Science)

基　　金：科技部高端外国专家引进计划项目(G2022046001L);国际科技合作推进计划项目(GJHZ202305)。

摘　　要：电网在运行时电压不可避免地含有一些附加的背景谐波成分,背景谐波的存在会使当电力电子装置与电网并网运行时,可能引起并网电流的波形畸变,同时会对电网的安全性、稳定性以及运行效率带来不良影响。针对此问题,先构建三相LCL型并网逆变器系统的阻抗数学模型,并深入探究电网电压波动对并网电流的具体影响机理;然后设计了一种电网电压全前馈抑制方法,用以减轻电网中背景谐波电压对并网电流造成的不利影响;最后进行了仿真验证,在加入策略后并网电流谐波含量从7.03%降到了1.46%。表明采用的电网电压全前馈抑制方法可有效地减小逆变器因电网背景谐波而产生的输出电流的影响,可有效抑制并网系统可能出现的谐振问题。During its operation,the power grid voltage inevitably contains some additional background harmonic components.The presence of these background harmonics can cause distortion in the waveform of the grid-connected current when power electronic devices are connected to the grid,and may also adversely affect the safety,stability,and operational efficiency of the power grid.To address this issue,the methodology starts by establishing an impedance mathematical model of a three-phase inverter system equipped with LCL-type filter;It then delves into the specific mechanisms by which voltage fluctuations in the power grid affect the grid-connected current;Subsequently,an advanced full feed-forward control strategy for grid voltage has been engineered to counteract the detrimental influences of background harmonic voltages in the power grid on the grid-connected current;Finally,the simulation verification is carried out.After adding the strategy,the harmonic content of the grid-connected current was reduced from 7.03%to 1.46%.The results demonstrate that the proposed full feed-forward suppression method for grid voltage effectively mitigated the impact of the inverter’s output current caused by background harmonics in the power grid,thereby effectively suppressing potential resonance issues in the gridconnected system.

关 键 词：LCL型并网逆变器 锁相环 阻抗模型 电压前馈 谐振抑制 

分 类 号：TM464[电气工程—电器]