Open AccessIterative design method of LCL filter for grid‐connected converter to achieve optimal filter parameter combination
Author(s) -
Tong Li,
Chen Chao,
Zhang Jianping
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8824
Subject(s) - harmonics , control theory (sociology) , inductance , filter (signal processing) , computer science , filter design , total harmonic distortion , harmonic , inductor , low pass filter , m derived filter , attenuation , electronic engineering , voltage , engineering , physics , acoustics , electrical engineering , control (management) , artificial intelligence , computer vision , optics
This study proposes an iterative design method of L‐type Inductor, Capacitor, and L‐type Inductor (LCL) filter for grid‐connected converter to achieve optimal filter parameter combination. LCL filter is commonly used for to reduce high frequency harmonic pollutions being injected into distributed power network. Accordingly, the performance of harmonics attenuation is taken as the most decisive constraint for filter parameter design. Usually, traditional methods apply the full‐modulated operating condition to acquire amplitudes of present voltage harmonics, leading to over‐designed capability of harmonics attenuation, which means increased inductance, degraded dynamic response, and enlarged weight and space. To deal with these challenges, the harmonic distortion factor is first proposed to evaluate the influence of different order voltage harmonic on grid current distortion. Also then, with four deduced constraint functions, an iterative design procedure is proposed to obtain satisfactory region of all filter parameters. As a result, the capability of harmonics attenuation can be precisely designed, and the optimal parameter combination brings about significant reduction of filter inductance. For instance, compared with the traditional method, the total inductance can be reduced by 23.3% in a 10 kW system. Finally, the experimental results are presented to demonstrate the effectiveness of proposed method.