A two‐stage IIDG fault control scheme considering the fault direction identification in active distribution networks

Abstract

In traditional power systems, the positive sequence fault component (PSFC) based criteria is often used to identify the fault directions. If the PSFC impedance angle of the inverter‐interfaced distributed generator (IIDG) is between 0 and 90°, the traditional PSFC‐based criteria will remain applicable in active distribution networks (ADNs). However, due to the diversity of the IIDG fault control mode and the uncertainty of the positive sequence voltage variation caused by faults, the PSFC impedance angle of IIDG is difficult to determine. To solve this problem, this paper proposes a two‐stage fault control scheme for IIDG. At different stages, IIDGs select different power references to meet different requirements. In the first stage, the PSFC impedance angle of IIDG is fixed to a given value, thereby maintaining the applicability of the PSFC‐based criteria in ADN. The detailed power reference calculation method of IIDG is given for this stage. In the second stage, IIDGs can select different fault control modes to support the fault voltage flexibly. By using the proposed two‐stage IIDG fault control scheme, the protection devices can accurately identify the fault direction in ADNs, which is verified by the MATLAB simulation results. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

Robust Assessment of Hosting Capacity of Renewable Generation in Distribution Systems Considering the Active Network Management

“…Literature [2][3][4] respectively studied the role of reactive power compensation, on-load voltage regulation and network reconstruction in improving the RDG hosting capacity of the ADN. Literature [5] combines the control strategy of photovoltaic inverters with optimal power flow (OPF) to increase the access of distributed wind turbines in the classic British power distribution network. Literature [3,6] proposed a multi-period optimal power flow method, taking ANM technologies like voltage regulation and power factor into consideration to analyze their impact on the hosting capacity of the distribution network.…”