WEN Minghao,CHEN Yu,WANG Yuxi,et al.Protection Directional Element for Transmission Line of Inverter-interfaced Generator Station Based on Positive-sequence d-axis Current Variation[J].Automation of Electric Power Systems,2025,49(14):190-199.
WEN Minghao,CHEN Yu,WANG Yuxi,et al.Protection Directional Element for Transmission Line of Inverter-interfaced Generator Station Based on Positive-sequence d-axis Current Variation[J].Automation of Electric Power Systems,2025,49(14):190-199. DOI: 10.7500/AEPS20240619001.
Protection Directional Element for Transmission Line of Inverter-interfaced Generator Station Based on Positive-sequence d-axis Current Variation
The directional element is a critical component of distance protection. However
the transient fault characteristics of the inverter-interfaced generator (IIG) may degrade the performance of conventional directional elements relying on steady-state power-frequency phasors
posing risks of maloperation. By analyzing the transient characteristics of
d
-axis current in IIGs and conventional generators during faults
this paper proposes a protection directional element for the transmission line of inverter-interfaced generator stations. The proposed method identifies the fault direction by comparing the variation of positive-sequence
d
-axis current shortly after the fault. Electromagnetic transient simulation results show that the proposed directional element remains applicable under conditions of varying fault ride-through control objectives and pre-fault output power in IIGs
ensuring accurate fault direction identification. A dynamic simulation test model for a typical IIG transmission system is also established
with experimental data confirming that the proposed directional element achieves rapid and accurate fault direction identification
exhibiting satisfactory performance under the sampling rate of existing protective devices
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