Analysis and Suppression of Harmonic Resonance in Photovoltaic Grid-Connected Systems

Tong Zhu, Gechao Huang, Xuetong Ouyang, Weilin Zhang, Yanfeng Wang, Xi Ye, Yuhong Wang and Shilin Gao ()
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Tong Zhu: State Grid Sichuan Electric Power Company, Chengdu 610041, China
Gechao Huang: State Grid Sichuan Electric Power Company, Chengdu 610041, China
Xuetong Ouyang: State Grid Sichuan Electric Power Company, Chengdu 610041, China
Weilin Zhang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Yanfeng Wang: State Grid Sichuan Electric Power Company, Chengdu 610041, China
Xi Ye: State Grid Sichuan Electric Power Company, Chengdu 610041, China
Yuhong Wang: College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Shilin Gao: College of Electrical Engineering, Sichuan University, Chengdu 610065, China

Energies, 2024, vol. 17, issue 5, 1-22

Abstract: In photovoltaic grid-connected systems, the interaction between grid-connected inverters and the grid may cause harmonic oscillation, which severely affects the normal operation of the system. To improve the quality of the output electrical energy, photovoltaic grid-connected systems often use LCL filters as output filters to filter out high-frequency harmonics. Taking the three-phase LCL-type photovoltaic grid-connected inverter system as an example, this paper addresses the issue of harmonic resonance. Firstly, based on the harmonic linearization method and considering the impact of the coupling compensation term on the grid-side voltage, a modular positive and negative sequence impedance modeling method is proposed, which simplifies the secondary modeling process of the converter under feedback control. Then, the stability analysis is conducted using the Nyquist criterion, revealing the mechanism of high-frequency resonance in photovoltaic grid-connected systems. Furthermore, this paper delves into the impact of changes in system parameters on impedance characteristics and system stability. The results indicate that the proportional coefficient of the internal loop current controller has a significant influence on system impedance characteristics. Additionally, this paper proposes an active damping design method that combines lead correction and capacitor current feedback to impedance-reconstruct the easily oscillating frequency band. Finally, the effectiveness of this method is verified in the simulation platform. Simulation results confirm the effectiveness of this method in suppressing harmonic resonance while maintaining rapid dynamic response.

Keywords: impedance modeling; grid-connected inverter; resonance suppression; active damping; impedance reshaping; small signal stability (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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