Resonance Detection Strategy for Multi-Parallel Inverter-Based Grid-Connected Renewable Power System Using Cascaded SOGI-FLL

Wu Cao, Kangli Liu, Haotian Kang, Shunyu Wang, 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
Haotian Kang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Shunyu Wang: 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

Sustainability, 2019, vol. 11, issue 18, 1-15

Abstract: The increasing use of multi-parallel grid-connected inverters introduces both high-quality and high-capacity power, while it tends to cause a resonance instability problem. A resonance damper can virtualize a resistor at resonant frequency to suppress the instability effectively, but the resonant frequency should be detected primarily. However, the resonant current or voltage is severely distorted and oscillating, which will lead to the resonant frequency extraction being more difficult. To address it, this paper proposes a resonance detection strategy based on the cascaded second-order generalized integrators (SOGI) and the normalized frequency locked loop (FLL). The cascaded structure ensures the accuracy by completely filtering the fundamental component from the detected voltage or current, and the normalization accelerates the frequency detection. The proposed method can be used as a crucial unit of the resonance damping controller. Finally, the performance of the proposed method is verified by the MATLAB-based simulation and Hardware-in-the-Loop (HIL)-based emulation results.

Keywords: renewable power system; grid-connected; resonance detection; frequency estimation; instability; cascaded SOGI-FLL (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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