Design and implementation of LCL-filter-based grid-connected inverters without damping

被引：0
|
作者：
机构：
[1] Jiangsu Provincial Key Laboratory of New Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics
[2] School of Electrical Engineering, Yancheng Institute of Technology
来源：
Yao, Z. (nhyzl@163.com) | 2013年 / Science Press卷 / 39期
关键词：
Digital control; Grid-connected; Inverters; LCL filter; Stability; Undamped;
D O I：
10.3969/j.issn.1003-6520.2013.05.031
中图分类号：
学科分类号：
摘要：
Suppressing resonances of LCL filter by either passive or active damping would increase loss or cost of a system. Therefore, we proposed a design method for numerical-controlled, undamped, LCL-filter-based, and space-vector-pulse-width-modulating (SVPWM) grid-connected inverters, which could realize stable system operation with appropriate design of parameters. A z-domain model of the grid-connected inverter was established, and the design procedure and an example of the system were provided in detail. Finally, experiments of a 15 kVA prototype of the proposed inverter were carried out. The results prove that the designed grid-connected inverter is a stable system, which keeps operating stably even under a sudden load change. Compared with active damping methods, the proposed grid-connected inverter does not need current sensor or voltage sensor, which might reasonably reduce the system cost. Besides, compared with passive damping methods, the proposed inverter has higher efficiency and smaller total harmonic distortion (THD) of grid current.
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页码：1232 / 1237
页数：5
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