A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid

Chengbi Zeng, Sudan Li, Hanwen Wang and Hong Miao
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Chengbi Zeng: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Sudan Li: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Hanwen Wang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Hong Miao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2021, vol. 14, issue 14, 1-18

Abstract: Repetitive control (RC) is gradually used in inverters tied with weak grid. To achieve the zero steady-state error tracking of inverter current and compensate the harmonic distortion caused by frequency fluctuation, a frequency adaptive (FA) control scheme for LCL-type inverter connected with weak grid is proposed. This scheme adopts a proportional resonance (PR) controller in parallel with RC (PRRC) to overcome the disadvantages caused by RC inherent one-cycle time delay. A fractional delay (FD) filter based on the Newton structure is proposed to approximate the fraction item of f s / f , where f s and f are sample frequency and grid frequency, respectively. The structure of the proposed FD filter is relatively simple; moreover, coefficients of the filter maintain constant so as not to need online tuning even when grid frequency fluctuates, which decreases the computational burden considerably. The feasibility and effectiveness of the proposed FA control scheme, named as Newton-FAPRRC, are all verified by the simulation and experimental results.

Keywords: repetitive control (RC); weak grid; frequency adaptive (FA); Newton structure; fractional delay (FD) filter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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