A wind turbine and a method for the wind turbine to overcome the influence of power grid fluctuations

Abstract

The invention discloses a wind turbine generator and a method for allowing the wind turbine generator to overcome electricity grid fluctuation influences. The wind turbine generator comprises a main power supply loop and an auxiliary power supply loop, wherein a PLC and multiple subsystems are arranged in the auxiliary power supply loop. An electric generator is isolated from an electricity grid through a full power converter, a stabilized voltage supply is arranged between a single-phase or three-phase power supply system and the auxiliary power supply loop of the wind turbine generator, an electricity grid monitoring module is connected into the auxiliary power supply loop of the wind turbine generator, and an electrical part in the auxiliary power supply loop is isolated from the electricity grid through the stabilized voltage supply. When fluctuations exsit in the electricity grid for a long time and in a large range, electric energy of the electric generator can still be fed to the electricity grid by the wind turbine generator through the isolation effect of the full power inverter installed in the main power supply loop so that the influences of electricity grid fluctuations on electric energy feeding can be eliminated, and a 400V high-voltage control system can still run normally through the isolation effect of the stabilized voltage supply installed in the auxiliary power supply loop.

Description

technical field [0001] The present invention relates to a motor and a method for overcoming grid fluctuations, in particular to a wind turbine and a method for wind turbines to overcome grid fluctuations Background technique [0002] As a new type of clean energy with large content and low pollution, wind energy is being used more and more at present. The proportion of wind turbines connected to the grid is gradually increasing. Whether the wind turbines can operate stably is related to the stability of the grid and the grid load. When the grid fluctuates, the wind turbine should have strong adaptability to maintain its own stable operation without disconnecting from the grid, and continue to feed active power and reactive power to the grid. [0003] Affected by factors such as geographical location and transmission lines, the voltage and frequency of the power grid fluctuate greatly in some areas, as shown in Table 1. [0004] Table 1 Some regional power grid operating pa...

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Problems solved by technology

[0007] 1. The electric energy generated by the generator will not be fed into the grid;

[0008] 2. The power supply of the auxiliary power supply system of the wind turbine will fluctuate: yaw, pitch and other circuits will not work normally;

[0009] 3. The wind turbine will shut down due to failure

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