Low-voltage ride-through circuit of doubly-fed wind generator set and control method for low-voltage ride-through circuit

A doubly-fed wind power generation and low voltage ride-through technology, which is applied in wind power generation, reactive power adjustment/elimination/compensation, single-grid parallel feed arrangement, etc., can solve problems such as insufficient reactive power support output of wind turbines, and achieve improved Operational stability, avoidance of damage, reduction of effects of transient processes

Active Publication Date: 2015-12-23
YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO +4
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Problems solved by technology

[0006] Aiming at the above-mentioned technical problems, the present invention discloses a low-voltage ride-through circuit and its control method for double-fed wind turbine generators. By selectively controlling

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  • Low-voltage ride-through circuit of doubly-fed wind generator set and control method for low-voltage ride-through circuit

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[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0029] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0030] like figure 1 What is shown is an implementation form of the low-voltage ride-through circuit of the doubly-fed wind power generating set according to the present invention, which includes:

[0031] A low-voltage ride-through circuit for doubly-fed wind power generators. The rotor of the doubly-fed generator DFIG is connected to the grid through a converter, and the stator is connected to the grid through a grid-connected switch K1. When the generator is generating power below the synchronous speed, the rotor absorbs power from the grid Electric energy, the output of the ...

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Abstract

The invention discloses a low-voltage ride-through circuit of a doubly-fed wind generator set. The low-voltage ride-through circuit comprises a crowbar circuit and an absorption circuit, wherein the crowbar circuit is connected between positive and negative ends of a direct-current bus of a converter and a generator rotor through a circuit breaker. The invention further discloses a control method for the low-voltage ride-through circuit of the doubly-fed wind generator set. The crowbar circuit is selectively triggered according to the amount of the excess energy on the rotor side. By the mode of selectively cutting in and cutting off the crowbar circuit according to the amount of the excess energy on the rotor side, the operation stability of a power generation system is effectively improved; the transient process caused by investment on the crowbar circuit is reduced on the basis of stabilizing the bus voltage of the converter; the power generation system is prevented from being impacted by over-high energy; a generator side converter and a rotor winding are prevented from being damaged; and a reactive support is provided for a power network as much as possible.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, in particular to a low-voltage ride-through circuit of a doubly-fed wind power generating set and a control method thereof. Background technique [0002] In the field of new energy power generation, wind power is already the fastest-growing form of power generation other than hydropower. Therefore, according to the natural conditions of our country's wind power reserves, we have very favorable conditions to develop this industry. From the perspective of wind resource reserves, according to the data of the National Meteorological Administration, the total reserves of wind energy resources at a height of 10 meters above the ground in my country are about 3.226 billion kilowatts, of which 253 million kilowatts can be developed and utilized. The height of 10 meters is twice as high, which is about 500 million kilowatts, and the offshore wind energy reserves that can be developed and uti...

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Application Information

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IPC IPC(8): H02J3/38H02J3/18
CPCY02E10/76Y02E40/30
Inventor 张怡
Owner YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO
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