LCL型并网逆变器数字单环控制延时影响与稳定域分析设计
发布时间：2018-10-19 07:02
【摘要】：数字控制可靠性高、控制灵活,但存在数字延时,改变了系统稳定性。在考虑计算、采样等数字延时情况下,采用直接数字法,建立LCL型并网逆变器离散精确数学模型,在连续域和离散域下,对网侧电流单环控制稳定性进行对比分析,说明数字延时改变对系统稳定性的影响,基于此在网侧电流单环反馈控制中设置数字延时为滞后一拍,主要分析滞后一拍情况下采样频率和谐振频率之比对稳定性的影响,得出其稳定的范围,同时对控制器参数进行了设计。仿真和实验证明了所提方法的正确性和有效性。
[Abstract]:Digital control has high reliability and flexible control, but digital delay changes the stability of the system. The discrete precise mathematical model of LCL grid-connected inverter is established by using direct digital method in the case of digital delay such as calculation and sampling. The stability of single-loop control of grid-side current in continuous domain and discrete domain is compared and analyzed. The effect of digital delay on the stability of the system is explained. Based on this, the digital delay is set as one beat behind in the single loop feedback control of the current on the grid side. The influence of sampling frequency and resonance frequency on the stability of the system is mainly analyzed in the case of one beat of delay. The stable range is obtained and the controller parameters are designed. Simulation and experiments show that the proposed method is correct and effective.
【作者单位】： 湘潭大学控制研究所;
【基金】：国家自然科学基金资助项目(51577162) 湖南省自然科学基金资助项目(14JJ5007)~~
【分类号】：TM464
[Abstract]:Digital control has high reliability and flexible control, but digital delay changes the stability of the system. The discrete precise mathematical model of LCL grid-connected inverter is established by using direct digital method in the case of digital delay such as calculation and sampling. The stability of single-loop control of grid-side current in continuous domain and discrete domain is compared and analyzed. The effect of digital delay on the stability of the system is explained. Based on this, the digital delay is set as one beat behind in the single loop feedback control of the current on the grid side. The influence of sampling frequency and resonance frequency on the stability of the system is mainly analyzed in the case of one beat of delay. The stable range is obtained and the controller parameters are designed. Simulation and experiments show that the proposed method is correct and effective.
【作者单位】： 湘潭大学控制研究所;
【基金】：国家自然科学基金资助项目(51577162) 湖南省自然科学基金资助项目(14JJ5007)~~
【分类号】：TM464
【共引文献】
相关期刊论文 前10条
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2 张珍;韦忠朝;;单相两级式光伏并网发电系统的研究与设计[J];湖北工业大学学报;2011年01期
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