Một số yếu tố ảnh hưởng tới quá điện áp quá độ do sét đánh trực tiếp vào cánh tua bin trong trang trại điện gió

Abstract

Vietnam is located in an area with a fairly high ground flash density [3], with ground flash density of 1.4 -14.9 times/km 2 .year, so the number ABSTRACTWind power is one of the growing renewable energy sources to meet the rapidly increasing demand for loads, in the context that traditional energy sources are increasingly limited and discouraged for development. However, wind power also has many disadvantages, one of which is frequently lightning strikes to the wind turbine blades, causing economic damage and disrupting power supply. There are many factors affecting to transient overvoltage when lightning strike to in wind power farms that have not been studied, in Vietnam, few published works. This paper analyzes some factors affecting lightning overvoltage in wind farm such as parameters of lightning current, grounding system of turbine, application of lightning surge arrester (LSA) installation solution, identifying the over voltages at the low-voltage and high-voltage side of the transformer. The results show that applying this solution can reduce the overvoltage value caused by lightning on the low voltage side by 60 times and the medium voltage side by 3 times. From these analysis results will be the basis for choosing effective lightning protection solutions for wind turbines. Research results are carried out using The Electromagnetic Transient Program Alternative Transient Program (EMTP/ATP).