A Comprehensive Analysis of the Influencing Factors of Interharmonics on a Distributed PV Grid-Connected Power Generation System

Mingxuan Mao (), Xiaoyu Ni, Zhao Xu, Haojin Sun and Chengqi Yin
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Mingxuan Mao: School of Automation, Wuxi University, Wuxi 214000, China
Xiaoyu Ni: School of Automation Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Zhao Xu: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Haojin Sun: School of Automation, Wuxi University, Wuxi 214000, China
Chengqi Yin: School of Automation, Wuxi University, Wuxi 214000, China

Energies, 2024, vol. 17, issue 23, 1-21

Abstract: In this paper, a detailed mathematical model for the interharmonic current in a distributed grid-connected photovoltaic (PV) system is proposed and the factors affecting its output characteristics are analyzed comprehensively. First of all, a transfer function approach is used to build a mathematical model for the interharmonic current in grid-connected PV systems. Then, the equation of the PV generator output characteristics is linearized. Furthermore, a real-time calculation method of the amplitude of interharmonic current is introduced based on the established mathematical model. Moreover, a series of comparative tests are conducted, and how various factors such as the MPPT parameters, the main circuit parameters and the environmental factors affect the interharmonic current are investigated. Finally, a series of simulation and experimental tests are conducted to verify the accuracy of the mathematical model for the interharmonic current and the real-time calculation method. The results show that the proposed model is useful for improving the performance of grid-connected PV systems in terms of the behavior of the interharmonic current. Moreover, the mathematical model and the analysis of the influencing factors provide valuable insights for improving system efficiency and reliability in practical applications.

Keywords: distributed grid-connected PV system; interharmonic current; trigonometric function orthogonality theorem; mathematical model; comprehensive analysis (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: 2024
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