Low voltage ride through analogue system of wind generation system

Abstract

The invention provides a low voltage ride through analogue system of a wind generation system for simulating the wind power by using an electric motor. The low voltage ride through analogue system comprises a main transformer, a complete wind generator to be detected and power grid control unit, wherein the main transformer is used for transforming the voltage of an output power grid, and a powergrid control unit is used for pulling down the voltage of the power grid. The low voltage ride through analogue system is characterized by further comprising an electric motor system, and the electric motor system comprises a stepless variable speed controller, a driving motor and a gearbox; the stepless variable speed controller is electrically connected with the output end of the main transformer; the gearbox is connected with the output shaft of the driving motor; the power grid control unit comprises an isolation transformer, a current-limiting reactance switch cabinet CB3, an incoming switch cabinet CB1 and a short-circuit reactance switch cabinet CB2. The driving motor is connected with the complete wind generator to simulate the outside wind power so that the low voltage ride through analogue system of the wind generation system of the invention can work in any period of time more efficiently and analog the work efficiency and has higher analogue precision.

Description

technical field [0001] The invention relates to a low-voltage ride-through simulation system of a wind power generation system, and more specifically, relates to a low-voltage ride-through simulation system of a wind power generation system which uses an electric motor to simulate wind force. Background technique [0002] People pay more and more attention to the quality of electric energy sent by wind turbines to the grid, and power companies have therefore put forward more stringent requirements for the performance of wind turbines under grid fluctuations. The national grid management regulations have been gradually formed in recent years, the purpose is to limit the harmful impact on the grid caused by the large-scale grid connection of wind power. [0003] In the past, the electric energy provided by wind power generation was usually very small. In this case, when a grid failure occurs, the automatic disconnection of the wind turbine will basically not affect the stabili...

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Problems solved by technology

[0004] However, the low-voltage ride-through simulation system of the existing wind power generation system is still very imperfect. At present, some methods at home and abroad are to make a container and then transport it to the wind farm to simulate the low-voltage ride-through test. There are disadvantages in this method. First, When a problem occurs, it is inconvenient to maintain in the field and the cost is high; secondly, because the natural wind on the wind farm is used, this makes the simulation efficiency of the existing low-voltage ride-through simulation system very low, and it is relatively restricted by the environment. Big

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