单相LLCL并网逆变器的研究  

Research on Single-phase LLCL Grid-connected Inverter

作　　者：彭崇文 曹太强 郭筱瑛[2] 张煜枫 陈雨枫 林玉婷 PENG Chongwen;CAO Taiqiang;GUO Xiaoying;ZHANG Yufeng;CHEN Yufeng;LIN Yuting(School of Electrical and Electronic Information,Xihua University,Chengdu 610039,Sichuan,China;College of Electrical Information Engineering,Panzhihua University,Panzhihua 617000,Sichuan,China)

机构地区：[1]西华大学电气与电子信息学院,四川成都610039 [2]攀枝花学院电气信息工程学院,四川攀枝花617000

出　　处：《电气传动》2018年第12期35-38,共4页Electric Drive

基　　金：四川省电力电子节能技术与装备重点实验室(szjj2015-066);成都市科技惠民技术研发项目(2016-HM01-00010-SF)

摘　　要：为了减小并网逆变器入网电流谐波成分,通过在LCL并网逆变器电容支路中串联谐振小电感形成LLCL型滤波电路,并使新的LC支路在开关频率处产生串联谐振,从而有效滤除开关频率处电流谐波成份。采用双电流环控制策略,外环采用PI控制保证系统具有一定精度和相角裕度,内环采用比例控制增加系统阻尼以抑制谐振尖峰,引入电网电压前馈控制增强系统抗扰动能力。最后通过Matlab进行仿真验证,与传统LCL滤波器相比,网侧电流THD从1.59%降至0.92%,且并网电流电压实现同频同相。结果表明,LLCL滤波器性能比LCL滤波器更优越。In order to reduce the harmonic component of the grid current in the grid-connected inverter,LLCL filter circuit was formed in series resonating small inductors at capacitance branch of the LCL grid-connected inverter,and series resonance was generated at the switching frequency in the new LC branch,so as to effectively filter the current harmonic component at the switching frequency.The double current loop control strategy was adopted,and the PI control guarantee system was adopted to guarantee the accuracy and the angle margin in the outer ring.The proportional control was adopted to increase system damping to suppress the resonance peak in the inner ring.In addition,the power grid voltage feedforward control was introduced to enhance the anti-disturbance capability of the system.Finally,the simulation verification was carried out by Matlab,compared with the traditional LCL filter,the net current THD was decreased from 1.59%to 0.92%,and the network current and voltage were realized the same frequency.The results show that the performance of LLCL filter is superior to LCL filter.

关 键 词：LLCL滤波器 开关频率 串联谐振 谐振尖峰 相角裕度 

分 类 号：TM464[电气工程—电器]