摘要
有源电力滤波器(active power filter,APF)是电力系统中实现谐波治理功能的一种新型变流设备。谐波检测作为APF的关键技术之一,直接决定了其整体性能。针对近来出现的一类基于直接交交变换技术的APF,提出一种新的谐波检测算法。该算法结合改进的滑窗离散傅里叶变换法以及对称分量法,实现对三相电网各次谐波的各序分量的独立的快速检测。新算法与传统方法相比具有简单快速的优势。尤其是当系统不平衡时,需要在每个谐波频率上对正序与负序分量分别检测的应用场合。此外,该算法同样可用于传统的APF中以实现快速的谐波检测。首先对新型直接交交型APF进行简要的介绍,再详细推导新的谐波检测算法的原理,并将该算法与传统算法进行比较研究。然后基于新的谐波检测算法针,对新型APF提出一整套滤波控制解决方案。最后对新的谐波检测算法进行仿真验证,并在一台3k W新型APF样机上对其进行实验验证,仿真与实验结果证明了新算法的正确性与实用性。
Active Power Filter （APF） is a new kind of equipment used in power grids to realize harmonic control function. As a key technology in APF, the harmonic detection algorithm directly determines the overall performance of the system. A new harmonic detection algorithm was proposed for the newly emerging direct AC-AC based APF. It is based on the combination of an improved sliding-window discrete Fourier transform （ISDFT） and symmetrical component method （SCM）, which can realize individual fast detection of each sequence components for different orders of harmonics. The algorithm is simpler and faster than the traditional detection ones. It is superior especially when the grid is unbalanced and large numbers of harmonics needs to be detected. Furthermore, the new method can also be used in traditional APF to get rapid harmonic detection. The new AC-AC based APF was introduced in this article as a background, then the principle of the new algorithm was analyzed in details and a comparative study between the new algorithm and the traditional method was given. By applying the proposed harmonic detection method, an overall solution was derived for the novel direct AC-AC based APF. Finally, simulation results were given to verify the correctness of the new method. Also, a 3kW AC-AC based APF prototype was built to validate the effectiveness of the method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第6期1473-1481,共9页
Proceedings of the CSEE
基金
国家863高技术基金项目(2011AA050202)~~
