摘要
位于偏远地区分布式发电系统长距离传输线给电网引入不可忽略的阻抗,使电网呈弱电网特点。当弱电网阻抗与逆变器输出阻抗不匹配时,并网电流在某些特定频率发生谐振,从而破坏逆变器的稳定性。基于阻抗分析法研究弱电网阻抗对LCL型并网逆变器稳定性的影响,并给出一种新型电容并联虚拟电阻有源阻尼算法来提高弱电网下并网逆变器的稳定性。最终,在一台500 W实验平台中对算法进行验证。
Long distance transmission line will introduce an equivalent impedance to grid which be made a weak power grid characteristic for those DG located in remote areas. Grid current resonance which undermines the stability of inverter is dominated by certain frequency components and is the result of impedance mismatch. This paper presents a research on control system stability of LCL type inverter based on impedance analysis and a new type of active damping algorithm based on capacitor in parallel with a virtual resistance is proposed to improve system stability as well. Finally, the method is demonstrated with experiment in a 500W experimental platform.
作者
白雪飞
胡国文
BAI Xue - fei HU Guo - wen(Yancheng Institute of Technology, Yancheng 224000, Chin)
出处
《节能技术》
CAS
2016年第5期474-476,F0003,共4页
Energy Conservation Technology
基金
电气工程及其自动化省级重点专业建设项目(2012JSZDZY-B185)
关键词
并网逆变器
弱电网
阻抗分析法
有源阻尼
分布式发电
grid - connected inverter
weak grid
impedance analysis
active damping
distributed generation - DG
