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Low-voltage ride-through switch and dynamic resistor for double-fed type wind driven generator set

A technology for wind turbines and low-voltage ride-through, applied in wind power generation, single-network parallel feeding arrangements, etc., can solve problems such as increasing system costs, achieve the effects of shortening transient time, reducing maximum fault current, and accelerating decay

Active Publication Date: 2012-08-22
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the crowbar electric group is connected to the rotor circuit in the low-voltage ride-through stage to suppress the rotor current, a large voltage will appear at the port of the crowbar resistor, and the port of the crowbar resistor is connected to the rotor converter, so it must be increased The voltage class of the rotor converter, which increases the cost of the system

Method used

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  • Low-voltage ride-through switch and dynamic resistor for double-fed type wind driven generator set
  • Low-voltage ride-through switch and dynamic resistor for double-fed type wind driven generator set
  • Low-voltage ride-through switch and dynamic resistor for double-fed type wind driven generator set

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] figure 2 Among them, the switch and dynamic resistance used in the low voltage ride-through of the doubly-fed wind power generating set in the present invention are based on the common crowbar resistance low voltage ride-through control topology, and three switches are respectively added to the rotor winding and the stator winding ( figure 2 A1, A2 and A3 in), three dynamic resistors ( figure 2 B1, B2 and B3 in ). The dynamic resistor consists of a triac and a resistor connected in parallel.

[0023] The present invention has following two working modes:

[0024] When the grid voltage is normal, the bidirectional thyristor switches A1, A2 and A3 are closed, and the rotor converter is connected to the rotor winding; the bidirectional thyristors of the dynamic resistors B1, B2 and B3 are closed, and the stator current passes through the bidi...

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Abstract

The invention discloses a low-voltage ride-through switch and dynamic resistor for a double-fed type wind driven generator set, comprising the double-fed type wind driven generator set, wherein a rotor and a rotor current transformer of the double-fed type wind driven generator set are connected; meanwhile, the rotor is further connected with a crowbar resistor in parallel and a stator is directly connected with a power grid, so that a low-voltage ride-through control topological structure of the crowbar resistor is formed; and a rotor winding and a stator winding of the double-fed type wind driven generator set are respectively and additionally provided with three switches and three dynamic resistors. According to the invention, the feasibility of control effects of a protection system can be guaranteed and the voltage grade of the rotor current transformer is not improved, so that the cost of the system is saved.

Description

[0001] technical field [0002] The invention belongs to the field of low-voltage ride-through control of wind power generators, in particular to a switch and a dynamic resistor for low-voltage ride-through of double-fed wind power generators. technical background [0003] In recent years, wind energy has received more and more attention because of its clean and economical advantages. With the continuous development of wind power generation and its control technology, the proportion of the capacity of wind power generators to the capacity of the entire power grid is on the rise. In order to prevent grid instability due to a large number of wind turbines being disconnected from the grid during a fault, the current grid requires wind turbines to have low-voltage ride-through capability. Low-voltage ride-through refers to the ability of wind turbines to keep running without cutting out of the grid in the event of a short-circuit fault in the grid, and to provide a certain amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 孙树敏程艳万文峰梁得亮辛征李广磊
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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