Methods and system for controlling wind turbine generator to be power-off and power-on

Abstract

The invention provides a method and a system for controlling a wind turbine generator to be power-off and power-on. The system comprises a main control cabinet loop, a cabin loop and a pitch system loop, wherein each loop is provided with a relay between a main control power supply and a power conversion module. The power-off control method comprises the steps that: a power-off command is sent to a PLC (programmable logic controller); a situation that whether a unit meets power-off conditions is judged, and the unit executes a normal shutdown process; and when the power-off conditions are satisfied, the PLC controls the main control cabinet loop, the cabin loop and the pitch system loop to power off the unit through a PLC relay, and stops an automatic power-on operation. The power-on control method comprises the steps that: the environmental conditions of a power grid and the unit are detected, and when power-on conditions are satisfied, a power-on process is executed through power-off relays of the main control cabinet loop, the cabin loop and the pitch system loop; or a manual power-on operation is carried out through a power-on button. According to the invention, the power-on and power-off operations of the wind turbine generator can be realized in a safe mode, thereby avoiding the damages on modules and devices caused by high-voltage impact and shock.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method and system for controlling power-off and power-on of wind turbines. Background technique [0002] With the popularization and application of wind power generation technology, more and more attention has been paid to the maintenance and repair of wind power equipment. When the wind farm line needs to be maintained, multiple large-scale power transmission equipment needs to be repaired, or there is a planned power outage and shutdown, it is necessary to perform shutdown and power-off or power-on and start-up operations. However, in the prior art, improper operation of power-off and power-on has a great potential safety hazard, and may seriously damage the unit equipment. [0003] First of all, due to the long power supply line of the wind power site, there is a large inductance, which can easily cause high-voltage shocks and oscillations when the power is turned off or...

AI Technical Summary

Problems solved by technology

However, in the existing technology, improper operation of power-off and power-on has great potential safety hazards, and may seriously damage the unit equipment

[0003] First of all, due to the long power supply line of the wind power site, there is a large inductance, which can easily cause high-voltage shocks and oscillations when the power is turned off or on. It is easy to cause damage to the components of the unit, especially the motion control module, such as PLC module, 24V power supply module, charger, UPS, etc. This situation is more serious in areas with poor power grid conditions

[0004] However, the current shutdown and power-off operation of wind turbines is to remotely shut down the unit first, and then directly disconnect the main circuit breaker at the substation. Electricity has a great impact on the unit

In practice, when the unit is running, the operation of directly disconnecting the circuit breaker of the substation will cause serious damage to the unit, which is generally considered to be strictly prohibited

[0005] In addition, due to the harsh environment of wind turbines, low temperature and high humidity, if the shutdown time is long, the temperature of each component will be low, which will easily cause condensation and frost, and rust spots will also occur on metal parts. If a short circuit occurs, even if it is not damaged in a short time, it will greatly reduce the service life of the device

[0006] It can be seen that there is a lack of solutions and control systems for the power-on and power-off processes of the unit in the safe mode in the prior art, and further improvement is urgently needed

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