Device of quick switch of wind power plant and control method

Abstract

The invention provides a device of a quick switch of a wind power plant and a control method. The device is characterized in that a plurality of boosting transformers are gathered in a wind power gathering station; a quick switch is connected in parallel with the reactor and then connected in series with the wind power gathering station; and the controller is electrically connected with the wind power gathering station and is electrically connected with the quick switch. The voltage of the wind power gathering station in real time is obtained; when the change of the voltage is detected, the quick switch is turned on, and the reactor is switched on; and when it is detected that the voltage is recovered to the rated voltage threshold value, the quick switch is closed, and the reactor is bypassed. According to the method for installing the quick switch on the high-voltage side of the wind power gathering station, during voltage fluctuation of an alternating-current power grid, the voltageat outlets of all wind turbine generators is adjusted, large-scale off-grid accidents of the wind turbine generators are prevented, transformation of each wind turbine generator is avoided, and the high-voltage and low-voltage ride-through capacity of the wind turbine generators in a wind power plant is improved; and the off-grid probability of the wind turbine generator caused by the fault of the alternating-current system is reduced.

Description

technical field [0001] The present application relates to the field of wind farm power generation, in particular to a device and control method for fast switching of wind farms. Background technique [0002] In recent years, the installed capacity of new energy has achieved rapid development. In the past ten years, the installed capacity of wind power has continued to increase, especially in some regions with developed wind resources. There are various ways of sending out, from sending out by AC line to sending out by AC / DC hybrid, and sending out by DC. [0003] Under the situation of continuous improvement of wind power installed capacity, some new problems have emerged in wind power transmission, such as different years of operation of wind turbines, different manufacturers, and different high and low voltage ride-through capabilities, especially those that were put into operation in the early stage The high and low voltage ride-through capabilities of wind turbines are ...

AI Technical Summary

Problems solved by technology

[0003] Under the situation of continuous improvement of wind power installed capacity, some new problems have emerged in wind power transmission, such as different years of operation of wind turbines, different manufacturers, and different high and low voltage ride-through capabilities, especially those that were put into operation in the early stage The high and low voltage ride-through capabilities of wind turbines are insufficient; wind farms are too concentrated, and when there is a ground fault in the AC system, the voltage at the wind power outlet will be lowered, resulting in an increasing risk of accidents in large-scale disconnection of wind farms; when wind power is converted from AC to DC Transmission or DC transmission, when the DC transmission system has a blocking fault, there is an overvoltage problem at the wind power transmission end, and the wind farm has insufficient high-voltage ride-through capability, resulting in a large-scale off-grid risk

In recent years, Xinjiang, Inner Mongolia and other areas with relatively concentrated wind power resources in China have experienced large-scale off-grid accidents of wind turbines due to AC system failures. It is difficult and difficult to transform a single wind turbine with high and low voltage ride-through capabilities. It requires a huge investment of manpower and material resources; therefore, it is necessary to propose an effective method to improve the high and low voltage ride-through capability of wind farms

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