[1]万晓凤,丁小华,聂晓艺,等.LCL型并网逆变器的改进数字单环控制技术[J].深圳大学学报理工版,2017,34(No.6(551-660)):611-617.
 Wan Xiaofeng,Ding Xiaohua,Nie Xiaoyi,et al.A digital single-loop control scheme of grid-connected inverters with LCL filter[J].Journal of Shenzhen University Science and Engineering,2017,34(No.6(551-660)):611-617.
点击复制

LCL型并网逆变器的改进数字单环控制技术()
分享到:

《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第34卷
期数:
2017年No.6(551-660)
页码:
611-617
栏目:
电子与信息科学
出版日期:
2017-11-30

文章信息/Info

Title:
A digital single-loop control scheme of grid-connected inverters with LCL filter
作者:
万晓凤丁小华聂晓艺刘志宇胡海林余运俊
南昌大学信息工程学院,江西南昌 330031
Author(s):
Wan Xiaofeng Ding Xiaohua Nie Xiaoyi Liu Zhiyu and Yu Yunjun
Information Engineering School, Nanchang University, Nanchang 330031, Jiangxi Province, P.R.China
关键词:
分布式电力技术LCL型并网逆变器单环控制数字控制延时脉宽调制超前补偿器
Keywords:
distributed power technology LCL-type grid-connected inverter single-loop control digital control delay pulse width modulation lead-leg compensator
文献标志码:
A
摘要:
建立逆变侧电流单环反馈控制LCL型并网逆变器数学模型,研究数字控制延时对系统稳定性的影响,得出系统稳定控制下的约束延时区间.为减小数字控制延时,通过前移脉宽调制比较寄存器装载时刻的方法,在未提高采样频率的情况下将采样延时减小为采样周期的1/2,使系统达到临界稳定状态;对比分析结果表明,采用参数优化的方法对传统相位补偿算法进行改进,在提高系统相位裕度的同时能降低系统高频增益,提高系统稳定性.仿真和实验结果验证了所提方法的有效性.
Abstract:
Based on the mathematical model of LCL-type grid-connected inverter with single-loop control of the inverter-side current, a detailed study is carried out on the relationship between the digital control delay and the stability of the system, then the constraint delay interval when the system maintain steady is obtained.To reduce the digital control delay, this paper adopts moving forward the register loading time of the PWM, thus the sampling delay can be reduced from one sampling period to 1/2 sampling period without increasing the sampling frequency, leading the system reach the critical stable state.Through comparing and analyzing the traditional compensation algorithm which based on the lead-leg compensator, it is shown that they have the problems of high gain of high frequency and compensating frequency offsets.Thus, this paper proposes a parameter optimization method to improve the traditional phase compensation algorithm, not only improved the system phase margin but also reduced the high frequency gain of the compensator, so the stability margin of the system can be improved.Simulation and experimental results verify the proposed control strategy.
更新日期/Last Update: 2017-10-10