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Line-to-Line Fault Analysis and Location in a VSC-Based Low-Voltage DC Distribution Network
Open AccessFeature PaperArticle

Three-Phase Short-Circuit Current Calculation of Power Systems with High Penetration of VSC-Based Renewable Energy

State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
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Energies 2018, 11(3), 537; https://doi.org/10.3390/en11030537
Received: 28 January 2018 / Revised: 23 February 2018 / Accepted: 23 February 2018 / Published: 2 March 2018
Short-circuit current level of power grid will be increased with high penetration of VSC-based renewable energy, and a strong coupling between transient fault process and control strategy will change the fault features. The full current expression of VSC-based renewable energy was obtained according to transient characteristics of short-circuit current. Furtherly, by analyzing the closed-loop transfer function model of controller and current source characteristics presented in steady state during a fault, equivalent circuits of VSC-based renewable energy of fault transient state and steady state were proposed, respectively. Then the correctness of the theory was verified by experimental tests. In addition, for power grid with VSC-based renewable energy, superposition theorem was used to calculate AC component and DC component of short-circuit current, respectively, then the peak value of short-circuit current was evaluated effectively. The calculated results could be used for grid planning and design, short-circuit current management as well as adjustment of relay protection. Based on comparing calculation and simulation results of 6-node 500 kV Huainan power grid and 35-node 220 kV Huaisu power grid, the effectiveness of the proposed method was verified. View Full-Text
Keywords: high penetration; VSC-based renewable energy; short-circuit current; DC component; peak value of short-circuit current high penetration; VSC-based renewable energy; short-circuit current; DC component; peak value of short-circuit current
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Zhou, N.; Wu, J.; Wang, Q. Three-Phase Short-Circuit Current Calculation of Power Systems with High Penetration of VSC-Based Renewable Energy. Energies 2018, 11, 537.

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