Robust Control and Optimization Method for Single-Phase Grid-Connected Inverters Based on All-Pass-Filter Phase-Locked Loop in Weak Grid

Longyue Yang, Tian Cao (), Huapeng Chen, Xinwei Dong () and Shuyuan Zhang
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Longyue Yang: School of Electrical Engineering, China University of Mining and Technology, University Road 1, Xuzhou 221116, China
Tian Cao: School of Electrical Engineering, China University of Mining and Technology, University Road 1, Xuzhou 221116, China
Huapeng Chen: School of Electrical Engineering, China University of Mining and Technology, University Road 1, Xuzhou 221116, China
Xinwei Dong: School of Electrical Engineering, China University of Mining and Technology, University Road 1, Xuzhou 221116, China
Shuyuan Zhang: School of Electrical Engineering, Shenyang University of Technology, Shen Liao West Road 111, Shenyang 110027, China

Energies, 2022, vol. 15, issue 19, 1-18

Abstract: In a distributed generation system, the all-pass-filter phase-locked loop (APF-PLL) is a commonly used method for grid synchronization. However, the coupling effect between APF-PLL and current control loop increases the risk of oscillation instability for the inverter in the weak grid. At present, there are few effective methods to solve the adverse effect of APF-PLL on the inverter-grid interconnection system in the weak grid. Therefore, a small-signal impedance model of the inverter considering the dual d-q frame brought by APF-PLL is first established. Then the reason for the inverter instability caused by APF-PLL in the weak grid is analyzed. Subsequently, an impedance reshaping method based on a modified first-order filter PLL with a complex coefficient filter (CCF-MFOF-PLL) and its parameter optimization design method are proposed. Finally, the experimental results verify that the proposed method widens the stable range of the inverter and ensures the stable operation of the inverter even with the large grid impedance.

Keywords: grid-connected inverter (GCI); phase-locked loop (PLL); complex coefficient filter (CCF); weak grid; robustness (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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