Harmonic Stability Analysis for Multi-Parallel Inverter-Based Grid-Connected Renewable Power System Using Global Admittance

Wu Cao, Kangli Liu, Shunyu Wang, Haotian Kang, Dongchen Fan and Jianfeng Zhao
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Wu Cao: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Kangli Liu: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Shunyu Wang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Haotian Kang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Dongchen Fan: State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 210096, China
Jianfeng Zhao: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2019, vol. 12, issue 14, 1-16

Abstract: Multi-parallel grid-connected voltage source inverters (VSIs) are widely applied in the fields of renewable energy, energy storage, harmonic suppression, etc. However, these inverters may cause harmonic stability problems due to the interactions among the grid-connected inverters through the grid impedance, which can seriously threaten system stability. The impedance-based stability criterion provides an effective tool for analyzing harmonic instability issues and can be divided into two types, namely, a ratio type and a sum type. Based on the existing studies of the sum-type criterion, this paper further proposes a new sum-type form based on the global admittance from the PCC to assess system stability through frequency-domain analysis. This global admittance-based stability criterion can be used not only to analyze system stability, but also to reveal the influence of each VSI unit on system stability with a lower computational burden and provide guidance for resonance suppression, especially in the case of a large number of grid-connected inverters and asymmetric inverter parameters. Finally, a MATLAB/Simulink model and 400 kVA/400 V experimental platform consisting of six grid-connected VSIs were established, and the corresponding results are presented to verify the effectiveness of the proposed method.

Keywords: grid-connected renewable power system; multi-parallel; harmonic stability; global admittance; stability criterion (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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