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Converter system and double-fed wind turbine generator set shutdown method

A doubly-fed generator and converter system technology, applied in wind power generation, control generator, control system, etc., can solve problems such as damage, stator contactor sintering, and influence on the converter system, so as to ensure the design life, Effects that reduce impact and weaken action requirements

Inactive Publication Date: 2015-10-14
SHENZHEN CHANGHAO MECHANICAL & ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is to provide a method for shutting down the converter system, which overcomes the high cost of the existing stator contactor, which affects the economy of the converter system and even the entire wind power generation unit, and the sintering and damage of the stator contactor risk defect
[0007] The second technical problem to be solved by the present invention is to provide a doubly-fed wind turbine shutdown method, which overcomes the defects of high cost of the existing stator contactor, affecting the economy of the wind turbine and the risk of sintering and damage of the stator contactor

Method used

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  • Converter system and double-fed wind turbine generator set shutdown method
  • Converter system and double-fed wind turbine generator set shutdown method
  • Converter system and double-fed wind turbine generator set shutdown method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Such as Figure 4 As shown, in this embodiment, the rotor-side switch 12 adopts the rotor contactor 121 (K2), and the grid-side protection device 16 adopts the grid-side circuit breaker 161 .

[0047] By operating the rotor contactor 121 and keeping the stator circuit breaker 10 closed, it is possible to eliminate the impact of high induced voltage on the double-fed transformer caused by the large slip state of the wind double-fed generator during the normal start-up and shutdown of the double-fed wind turbine. The impact of the machine-side converter and the grid-side converter in the converter weakens the operation requirements for the stator circuit breaker 10. Because the limit of the number of actions of the contactor is generally far greater than that of the circuit breaker, the design life of the doubly-fed generator and converter system is guaranteed.

[0048] Of course, during the normal shutdown process of the doubly-fed wind turbine, the stator circuit break...

Embodiment 2

[0053] Such as Figure 5 As shown, in this embodiment, the rotor-side switch 12 adopts the rotor contactor 121 , and the grid-side protection device 16 adopts the grid-side circuit breaker 161 .

[0054] In other embodiments, the grid-side circuit breaker 161 may be replaced by a grid-side fuse 162 .

[0055] In order to reduce the negative effect that the stator winding of the doubly-fed generator obtains the excitation current due to maintaining the closure of the stator circuit breaker 10 when the doubly-fed wind power generating set is shut down, this embodiment is also provided with a capacitor group 17, which adopts The star connection method is connected to the three-phase line between the stator circuit breaker 10 and the stator winding of the doubly-fed generator 100 .

[0056] After the capacitor group 17 is connected to the three-phase line between the stator circuit breaker 10 and the stator winding of the double-fed generator 100, the capacitive current generated...

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Abstract

The invention discloses a converter system and a double-fed wind turbine generator set shutdown method. The converter system comprises a converter, a stator circuit breaker, a rotator side switch and a network side protection device. Ratios of winding turns of a rotator and a stator of a double-fed generator matched with the converter system are greater than 1; a converter side inverter is connected with the generator rotator winding through the rotator side switch; the network side converter is connected with a stator and rotator branch electrical collecting point; a stator circuit breaker is connected with a generator stator winding and the electrical collecting point; the network side protection device is connected with the network inverter and the electrical collecting point. The double-fed wind turbine generator set comprises a tower drum, a fan, a gearbox, a double-fed generator, a transformer, a variation paddle device, a main controller and the converter system. The shutdown method comprises: disconnecting the rotor side switch when the double-fed generator is normally shut down; and keeping the stator circuit breaker to close. According to the converter system and the double-fed wind turbine generator set shutdown method, the construction cost of the current inverter system and the whole turbine power generator set is reduced, and the system economical efficiency is improved; and the converter system is safe and reliable to operate, and convenient to use.

Description

technical field [0001] The invention relates to a method for stopping a converter system, and also relates to a method for stopping a doubly-fed wind power generating set using the converter system. Background technique [0002] As a new energy source that is clean, renewable and has great potential, wind power has been developing rapidly all over the world. Megawatt wind turbines mainly include doubly-fed wind turbines and full-power wind turbines. Such as figure 1 As shown, the double-fed wind turbine is mainly composed of a tower (not shown in the figure), a fan, a gearbox, a double-fed generator and a converter system, a transformer, a pitch device, and a main controller. Among them, the primary side of the transformer is connected to the high-voltage external power grid, and the secondary side is connected to the low-voltage internal power grid. The doubly-fed generator and converter system is located between the fan, gearbox and the internal power grid, and is the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/00H02P101/15
CPCY02E10/76
Inventor 周党生韩玉
Owner SHENZHEN CHANGHAO MECHANICAL & ELECTRICAL
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