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Power grid failure traversing system and method of 2 MW and more than 2 MW double-fed wind generating set complete machine

A double-fed wind power generation and power grid failure technology, which is applied in wind power generation, electrical components, and single-network parallel feeding arrangement, can solve the problems of stable operation of the power grid, loss of power grid voltage support capacity, chain reaction, etc., and reduce maintenance cost, lower failure rate, and prolong service life

Inactive Publication Date: 2012-05-16
上海电气风能装备有限公司
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Problems solved by technology

With the increasing capacity of wind turbines and the scale of wind farms, if large-scale wind turbines are disconnected from the grid, the wind turbines will lose their ability to support the grid voltage, which may cause serious chain reactions and affect the stability of the grid. serious impact on operation

Method used

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  • Power grid failure traversing system and method of 2 MW and more than 2 MW double-fed wind generating set complete machine
  • Power grid failure traversing system and method of 2 MW and more than 2 MW double-fed wind generating set complete machine
  • Power grid failure traversing system and method of 2 MW and more than 2 MW double-fed wind generating set complete machine

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with accompanying drawing.

[0048] see figure 1 , the figure shows a grid fault ride-through system for a 2MW and above doubly-fed wind turbine generator set of the present invention, which includes a converter system, a controller system, a pitch system, and a torque limiter, wherein:

[0049] Converter system, including the unloading unit connected to the DC test of the converter, the active crowbar connected to the converter controller, the converter, and the UPS power supply system, and the UPS power supply system is also connected to the grid-connected switch to ensure During the fault period, the wind turbine is normally connected to the grid, the active crowbar and the unloading unit are used to protect the generator and the converter, and the converter controller can send a fault signal to the controller system and receive a recovery signal;

[0050] The controller system is connected to the ...

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Abstract

The invention provides a power grid failure traversing system and method of a 2 MW and more than 2 MW double-fed wind generating set complete machine. The system comprises a convertor system, a controller system, a pitch system and a torque limiter. The method comprises the following steps: detecting the operation condition of a power grid; judging whether a failure appears: if not, returning to the step S1, and if so, dynamically switching to a failure traversing operation mode; detecting the operation condition of the power grid; and judging whether the failure recovers: if not, returning to the step S7, if so, recovering a normal operation state, and then returning to the S1. According to the invention, while the protection actions of each part in a failure period are ensured, the conjugation problem of an integrated system is solved, no-network operation in the failure period is realized, the power grid is supported, and the service life of a machine set is prolonged; and the failure rate of the machine set is reduced, thereby greatly reducing the maintenance cost of the machine set.

Description

Technical field: [0001] The invention relates to a power grid fault ride-through system and method for a complete wind power generating set. technical background: [0002] At present, due to its green and environmentally friendly new energy characteristics, wind power has developed rapidly in China in recent years, and large-scale wind farms have been gradually built in China. [0003] The doubly-fed wind turbine is a commonly used model in the wind power industry today. The stator side of the doubly-fed induction generator (DFIG) is directly connected to the grid, and the rotor side is coupled to the grid through an AC-DC-AC converter. The coupling between the machine and the grid is not completely through the converter. When the grid fails, the following problems will occur: [0004] The failure of the power grid causes the terminal voltage of the wind turbine to drop, causing the stator current of the generator to increase. [0005] Due to the strong coupling between th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02J3/38
CPCY02E10/763Y02E10/76
Inventor 禹华军李楠
Owner 上海电气风能装备有限公司
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