1.College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China;2.Shandong Kehui Electric Automation Co., Ltd., Zibo 255000, China

Before the active distribution network reclosing, the distributed energy resource (DER) must be disconnected from the grid. However, in practice, many substations do not have line-side voltage transformers installed, resulting in the inability to implement a voltage-free reclosing scheme. This paper proposes a time-limited adaptive reclosing method in coordination with DER anti-islanding protection. The operation time of DER anti-islanding protection connected to the line is inferred by the system-side bus voltage before the protection trip, and the operation time of distribution line reclosing is automatically adjusted to achieve the timing coordination of reclosing and anti-islanding protection. The proposed method does not require the installation of line-side voltage transformers and does not rely on communication networks. It considers the requirements of low voltage ride-through of DERs while achieving fast reclosing of distribution lines, providing support for the stability of power system operation and power supply reliability. The effectiveness of this method has been verified by simulation and experimental results.