A Frequency Adaptive Multi-Rate Repetitive Control for Single-Phase Grid-Connected Inverter

EasyChair Preprint 8791

Abstract

In order to improve the harmonic suppression capability of the traditional repetitive control (CRC) when the grid frequency fluctuates and reduce the computational burden of the digital system, a frequency adaptive multi-rate repetitive control (FAMRC) scheme is proposed in this paper. FAMRC is composed of a multi-rate repetitive control (MRC) with low sampling rate and a Farrow structure fractional delay (FD) filter based on Taylor series expansion. After the stability analysis and parameter design of the system, FAMRC can achieve lower tracking error and faster convergence speed, accurately approximate the FD generated when the fundamental frequency of the power grid fluctuates, and achieve good frequency adaptation. Simulations verify the effectiveness of the proposed strategy.

Keyphrases: Fractional delay, Frequency adaptation, multi-rate, repetitive control

@booklet{EasyChair:8791,
  author    = {Kaiyue Liu and Qiangsong Zhao and Gong Zhang and Bin Wang},
  title     = {A Frequency Adaptive Multi-Rate Repetitive Control for Single-Phase Grid-Connected Inverter},
  howpublished = {EasyChair Preprint 8791},
  year      = {EasyChair, 2022}}