摘要
针对传统单并网逆变器采用滞环空间矢量控制时,在交流侧存在电流谐波总畸变率(Total Harmonic Distortion,THD)相对较大的问题,提出一种新型LCL滤波器对双频并网逆变器输出电流进行滤波。采用基于准比例谐振调节器和PI矢量控制调节器组成双闭环控制将其应用于高频逆变器,从而改善了系统并网电流的动态性能,低频逆变器采用滞环控制,能快速跟踪高频逆变器电流,传递大部分功率,大幅度降低了开关损耗,使得并网电流谐波总畸变率减小。利用MATLAB/Simulink为仿真平台建立可再生电源发电系统模型,有效验证了双频并网逆变器动态性能和稳态性能,从而提高了并网逆变器的电能输出质量。
When traditional single grid connected inverter is controlled by hysteresis space vector, the large total harmonic distortion（THD） of current exists in the AC side. In this article, we put forward a new LCL filter to filter the output current of dual - frequency grid - connected inverter. At first, double closed - loop control was established based on quasi proportional resonant regulator and PI vector control regulator, which was applied to the high - fre- quency inverter, so as to improve the dynamic performance of gridconnected current. Meanwhile, the hysteresis control was applied to low -frequency part of inverter, which can track high -frequency inverter current quickly and transform most power. Thus, the switching loss was reduced greatly and the total harmonic distortion of grid - connected current was reduced. Finally, MATLAB/Simulink was used to build renewable power generation system model for the simulation platform. The dynamic performance and steady - state performance of dual - frequency grid - con- nected inverter were tested and verified. Thus, the output quality of grid - connected inverter is improved.
作者
代满意
陈华
郑芬
DAI Man - yi;CHEN Hua;ZHENG Fen(College of Electrical Engineering,Xinjiang University,Urumqi Xinjiang 830047,China;College of Electrical Engineering ＆ Control Science,Nanjing Tech University,Nanjing Jiangsu 211816,China)
出处
《计算机仿真》
北大核心
2018年第8期61-65,共5页
Computer Simulation
基金
国家自然科学基金资助项目(51567022)
关键词
双频并网逆变器
滞环控制
滞环空间矢量控制
Dual- frequency grid- connected inverter
Hysteresis control
Space vector hysteresis control
