An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements

Fan Yang, Yang Lei, Hechong Chen, Zhichun Yang, Huabo Xu (), Heng Chen and Yu Chen
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Fan Yang: Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Yang Lei: Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Hechong Chen: Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Zhichun Yang: Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China
Huabo Xu: College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Heng Chen: College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Yu Chen: College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China

Energies, 2023, vol. 16, issue 20, 1-20

Abstract: Grid-tied distributed generators (DGs) need to be equipped with anti-islanding protection to avoid the impact of unplanned islanding, which would affect system stability, auto-reclosing, and personal safety. Among the active anti-islanding protections, impedance measurements based on signal injection have the advantages of a low non-detection zone (NDZ) and are less prone to maloperation during grid disturbances; however, there are problems with signal interference in multi-DG systems. Hence, the impedance angle measurement method with signals injected synchronously is proposed. In this method, each DG injects phase-coherent signals to detect islanding using zero-cross points of the voltage (ZCPV) to avoid the protection failures caused by signal interference. An islanding identification criterion based on the measured impedance angle is proposed by analyzing the impedance characteristics of grid connection and islanding, which avoids the influence of variation of the DG operation state on islanding detection. Finally, we present a signal injection strategy and performance analysis in combination with an existing DG control platform, avoiding additional hardware investment. RTDS-based simulation verification shows that the proposed method can 100% avoid DG maloperation due to voltage and frequency disturbances during grid-connected operation and exit operation within 2 s when islanding occurs.

Keywords: anti-islanding protection; distribution network; impedance angle criterion; synchronized injection; voltage synchronization (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: 2023
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