摘要
相较于单L滤波器,LCL滤波器可在有效滤除高次谐波的同时减小滤波器的体积、降低滤波器的功率损耗。为解决LCL滤波器的谐振以及网侧电感电流畸变等问题,提出了在单电感型并网电流控制策略的基础上引入网侧(或逆变器侧)电感电流修正量的控制策略。因在引入电流修正量时,须在非反馈侧安装电流传感器,为避免添加电流传感器带来的成本问题,利用二维状态观测器估计网侧电感电流,在不增加设备成本基础上有效观测网侧电感电流。仿真和实验结果验证了所提策略的可行性。
Compared with single L filter,LCL filter can reduce volume and power loss, meanwhile filtering out higher harmonics effectively. To solve problems with LCL filters such as resonance and grid-side current distortion, this paper proposes a strategy introducing grid-side(or inverter-side) current correction on basis of single inductor grid current control scheme. Since current sensor must be installed in non-feedback side when introducing current correction, in order to eliminate cost increase caused by additional sensor, a two-order state observer is used to effectively estimate grid-side current.Finally, feasibility of the new control strategy is verified with simulation and experiment.
出处
《电网技术》
EI
CSCD
北大核心
2016年第2期556-562,共7页
Power System Technology
基金
国家自然科学基金项目(61463037)~~
关键词
三相并网逆变器
LCL滤波器
电流修正量
二维状态观测器
three-phase grid-connection inverter
LCL filter
the amount of correction of current
two-order state observer
作者简介
刘斌(1975-),男,博士后,副教授,研究方向为预测控制系统、电力电子技术和新能源技术等
王蒙蒙(1988-),男,硕士研究生,研究方向为光伏并网发电系统控制技术,E-mail:942204361@qq.com