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http://dx.doi.org/10.1007/s43236-021-00355-0

Active damping strategy with differential feedback of grid-side inductor voltage for LCL-filtered grid-connected inverters  

Li, Mingming (College of Engineering, Southeast University)
Xiao, Hua F. (College of Engineering, Southeast University)
Cheng, Ming (College of Engineering, Southeast University)
Publication Information
Journal of Power Electronics / v.22, no.2, 2022 , pp. 176-186 More about this Journal
Abstract
Active damping (AD) methods with extra feedback provide a high rejection of the resonance peak caused by LCL-filters, and have the advantages of simple implementation and strong robustness. Among them, capacitor current proportional-feedback AD has been proved to be effective and robust with only a proportional calculation. However, a large capacitive current pulsation restricts the detection accuracy. Based on a theoretical derivation, the same damping effect but with a better rejection of grid harmonic can be obtained by grid-side inductor voltage differential-feedback AD. However, the measured inductor voltage usually contains a parasitic resistance voltage that is difficult to separated, and it deteriorates the performance of LCL-filters. To solve this problem, a differential-negative proportional method based on the vector relationship between the voltages of the grid-side inductor and its parasitic resistance is proposed in this paper. In addition, the influence of control delays is considered and a solution is given. Experimental results based on a 3 kW LCL-type grid-connected inverter prototype are provided to verify the effectiveness of the proposed method.
Keywords
Grid-side inductor voltage; Differential feedback; Parasitic resistance; Control delays;
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Times Cited By KSCI : 4  (Citation Analysis)
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