Distance relaying algorithm for intertie protection of a wind farm considering the fault ride-through requirement

作者：Kang Yong Cheol^*; Kang Hae Gweon; Zheng Tai Ying; Kim Yeon Hee; Lee Young Gui

来源：Transactions of the Korean Institute of Electrical Engineers, 2010, 59(6): 1053-1058.

• Distance relay
• Fault ride-through
• Least Square
• Voltage blokcing
• Wind farm

A large modern wind farm should satisfy the requirements for a grid and accomplish the optimization of the wind farm system. The wind farm intertie protection system should consider a Fault Ride-Through (FRT) requirement for more reliable protection. The wind farm should keep connected to the grid in the case of a grid fault whilst it should be isolated for an intertie fault. This paper proposes a distance relaying algorithm suitable for wind farm intertie protection considering the FRT requirement The proposed algorithm estimates the impedance based on a differential equation method because the frequency of the voltage and current deviates the nominal frequency. The algorithm extends the reach of Zone 1 up to 100 % of the length of the intertie to implement the FRT requirement. To discriminate an intertie fault from a grid fault, the algorithm uses a voltage blocking scheme because the magnitude of the voltage at the relaying point for an intertie fault becomes less than that for a grid fault. The performance of the algorithm is verified using a PSCAD/EMTDC simulator under various fault conditions. The algorithm can discriminate successfully the intertie fault from grid fault and thus helps to implement the FRT requirement of a wind farm.

• 出版日期2010