Iterative design method of LCL filter for grid-connected converter to achieve optimal filter parameter combination

The Journal of Engineering

Chao Chen¹  Li Tong¹  Jianping Zhang¹ 

[1] State Grid Zhejiang Electric Power Research Institute;

关键词: harmonic distortion;    power harmonic filters;    power convertors;    power system harmonics;    power grids;    power filters;    power system control;    harmonics attenuation;    optimal parameter combination;    filter inductance;    iterative design method;    LCL filter;    grid-connected converter;    optimal filter parameter combination;    high frequency harmonic pollutions;    filter parameter design;    voltage harmonics;    harmonic distortion factor;    grid current distortion;    iterative design procedure;    practical harmonic maximum operating condition;    filter parameters;   

DOI  :  10.1049/joe.2018.8824

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown