access icon openaccess Multi-resistor BFCL for FRT capability improvement of DFIG-based wind farm

This is an open access article published by the IET and Tianjin University under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 02/02/2020, Accepted 06/05/2020, Revised 05/04/2020, Published 07/05/2020

Grid connection of wind farms (WFs) results in increment of short circuit level and decrement of fault ride-through (FRT) capability under fault conditions. Application of bridge-type fault current limiter (BFCL) was recognised as a promising and cost effective solution to cope with these problems. However, full resistor insertion of the conventional BFCL provides high transient overvoltage at the terminal of wind generator under low voltage sag condition, which can lead to failure operation of wind generator in despite of FRT requirement. This study presents a voltage adaptive multi-resistor BFCL (MRBFCL) to solve these problems for wide voltage sag levels. According to the depth of voltage sag level at the grid coupling point voltage, the MRBFCL inserts an appropriate combinational of resistors to compensate voltage sag level at acceptable level. To verify the efficiency of the proposed MRBFCL, time domain simulations were performed in PSCAD/EMTDC software under three different voltage sag levels. Also, the MRBFCL performance is compared with the conventional single-resistor BFCL. Simulation results reveal that the MRBFCL effectively enhance the FRT performance of doubly-fed induction generator (DFIG)-based WFs under wide range of voltage sag level and alleviate over voltage for low voltage sag conditions.

Inspec keywords: power system simulation; power grids; resistors; asynchronous generators; power generation reliability; power supply quality; fault current limiters; wind power plants; failure analysis; power generation faults; time-domain analysis

Other keywords: bridge-type fault current limiter; resistor insertion; grid connection; MRBFCL performance; FRT performance; time domain simulations; fault ride-through capability; grid coupling point voltage; voltage adaptive multiresistor BFCL; doubly-fed induction generator-based WF; resistors; DFIG-based wind farm; voltage sag levels; acceptable level; wind generator; transient overvoltage; failure operation; PSCAD/EMTDC software; FRT capability improvement; short circuit level; fault conditions; low voltage sag condition

Subjects: Protection apparatus; Reliability; Asynchronous machines; Wind power plants; Resistors; Mathematical analysis; Power supply quality and harmonics

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