Abstract
As more and more distributed power sources are connected to low and medium voltage distribution networks, the traditional single-ended passive distribution networks have evolved into multi- terminal, multi-source active distribution networks. When distributed generations with high permeability are connected to a distribution network, the structure and power flow of this network will change significantly, thus the original fault detection method and reclosing scheme may be challenged, which may cause incorrect action of protection or failure of reclosing. On basis of that, this paper proposes an active distribution network fault recovery scheme based on 5G wireless communication, in which the topology recognition technology and smart terminal units with peer-to-peer communication capability are applied. To prove the method’s feasibility, delay of 5G communication is analysed and tested online. In addition, a model of 10 kV active distribution network is built on Real Time Digital Simulation system. Principle investigation and simulation indicate that the proposed scheme can adapt to the change of network structure and implement the fault self-healing quickly.
Highlights
In early days, to clear the fault quickly and reliably in active distribution network, it is required that the distributed generator (DG) should be out of operation after fault
Most high-level functions of 5G base station are concentrated in the Central Office (CO) of data centre, some wireless-related functions are managed by the Central Unit (CU), and the underlying functions of base station are implemented by the Distributed Unit (DU)
Massive MIMO technology is introduced into 5G communication technology, the traditional Remote Radio Unit (RRU) and antenna are combined into the Active Antenna Unit (AAU)
Summary
To clear the fault quickly and reliably in active distribution network, it is required that the distributed generator (DG) should be out of operation after fault. Based on the output current characteristics of DG, [5] proposed a distributed regional longitudinal protection scheme for distribution networks, focusing on an online associated area determining method for longitudinal protection, which can be used when the operating mode or network topology changes. This method can adaptively identify the topology and reconfigure the associated area. The 5G communication technology has great flexibility and adaptability, DG can conveniently access to the protection and control system of existing distribution network. Unlike the one size fits all 4G core networks, the 5G core network must be flexible and adaptable and is expected to simultaneously provide optimized support for the diverse 5G use case categories [10]
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