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Wind farm low voltage resistor
Apr 25, 2018

Wind farm low voltage ride through (LVRT) capability or fault ride through (FRT) capability means that wind farms or wind turbines can remain on-grid within a certain period of time when the wind turbine terminal voltage drops to a certain value during a grid fault. The ability to run without interruption is considered to be the biggest challenge to the design and manufacturing technology of wind turbines. At present, the wind power grid-connected guidelines of many countries have put forward stricter technical requirements for wind farms, such as LVRT, and have even used the standard of conventional power sources to require wind farms. Wind farms with different types of wind turbines have different LVRT capabilities. Current measures to improve the LVRT capability of wind farms include pitch control, rotor acceleration control (double-fed induction motor and optimal slip motor), and dynamic reactive power compensation. Pitch angle adjustment speed does not meet the requirements of LVRT capability well. Rotor acceleration control is only applicable to certain types of generators, and dynamic reactive power compensation devices are less economical. Therefore, it is necessary to study solutions that are both technically and economically satisfactory. Different from the traditional parallel braking resistors, the paper introduces the method of using the series braking resistor to improve the LVRT capability of the wind farm, proposes a braking resistance switching strategy based on the speed-voltage dynamic stability domain, and aims at the constant speed wind turbine-based A typical wind farm model was simulated transiently.