摘要
SAPF并网接口滤波器LCL存在谐振峰易使系统发散,为有效抑制谐振峰,提出一种基于RC并联LCL无源增阻尼新方法。建立方案模型,结合IEEE519—1992标准计算抑制纹波的最小容感总值,并权衡阻尼性能、功率损耗等进行滤波参数寻优,旨在高阻尼、低损耗、高效率。仿真和实验结果表明该方法不仅有效抑制谐振峰,而且与工程上常用电容支路串电阻法相比,在不改变高低频段衰减特性的前提下,以低损耗、低成本获得相似的阻尼特性,相频特性过渡带陡峭,纹波抑制效果好,是SAPF输出滤波器较好的选择。
LCL filter is likely to make the system diverge in grid-connected SAPF interfaces because of resonance peaks. In order to effectively suppress resonance peaks,a new method of RC parallel LCL for increasing the damping is proposed. In this paper,the program model is proposed,then the minimum capacitance and inductance value for ripple rejection is calculated according to IEEE519—1992 standard. The damping performance and power consumption,etc. to further parameters optimization are balanced for high damping,low-loss,high efficiency. Simulation and experimental results indicate that this method not only effectively suppresses resonance peaks,but also achieves similar damping characteristics by low loss,low cost without changing attenuation characteristics of both high and low fre-quency band when compared with the common method of capacitor branch series resistance in engineering. And this method also has a good filtering effect as the steep transition of phase frequency characteristics curve,which is a better choice for SAPF output filter.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第8期19-24,共6页
Proceedings of the CSU-EPSA
基金
国家自然科学基金项目(51307076)
