Wind power plant low voltage ride through control method

A low-voltage ride-through and control method technology, applied in the direction of AC network voltage adjustment, power network operating system integration, information technology support system, etc., can solve problems that remain in theoretical research and cannot be practically applied to wind farms or wind turbines. Achieve the effects of less involved content, easy on-site management, and accelerated voltage recovery

Active Publication Date: 2013-08-14
北京光耀电力科技股份有限公司
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  • Abstract
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Problems solved by technology

Therefore, the program is still at the stage of theoretical research and cannot be practically applied to wind farms or wind turbines

Method used

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Embodiment Construction

[0038] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention are described below.

[0039] The purpose of the present invention is to provide a control method for successfully completing the low voltage ride through function in the low voltage ride through device used for the wind power generating set in the wind farm. This method is proposed in accordance with the relevant requirements of Article 8 "Low Voltage Ride-through of Wind Farms" in the State Grid Q / GDW 392-2009 "Technical Regulations for Connecting Wind Farms to the Power Grid".

[0040] Measure the three-phase current and voltage at the end of the wind farm connected to the grid, the measurement sampling frequency is 80KHZ, and calculate the equivalent impedance value of the grid. For a standard wind farm with 33 1.5MW wind turbines, there are 3 collection lines, each collection line Hanging 11 ...

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Abstract

The invention discloses a wind power plant low voltage ride through control method, and particularly relates to a control method of a system and a device having a wind power plant low voltage ride through function. A basic principle of the wind power plant low voltage ride through control method is as follows: a three-phase current and voltage of an end, which accesses to a grid, of the wind power plant are measured, and equivalent impedance of the grid is calculated, so that a modularization impedance array which can be adjusted quickly is constructed; and the impedance array is connected with a high-speed circuit breaker in parallel and then is in series connection between a wind power plant converging wire and a boosting transformer incoming circuit breaker, judgment of generation of low voltage is completed within 2-4 milliseconds, the time point of a voltage sine wave zero crossing point is calculated, the high-speed circuit breaker completes a disconnection motion at the zero crossing point, the time of the low voltage judgment and the circuit breaker motion is not more than 12 milliseconds, access in series with a impedance array with the equivalent impedance of the grid is realized, and wire concentration voltage of the wind power plant is maintained to be unchanged.

Description

technical field [0001] The invention relates to a low-voltage ride-through control method of a wind farm, in particular to a control method of a system and a device with a low-voltage ride-through function of a wind farm. Background technique [0002] With the rapid development of wind power generation in recent years, the proportion of wind power in power supply has also increased rapidly. The resulting problems have also attracted widespread attention. Especially after the power grid fails and the voltage drops, if the wind turbines are disconnected one after another, the system will be temporarily unstable and may cause partial or even complete system failure. Therefore, Power grid companies have put forward certain requirements for wind turbines to be connected to the grid. The low voltage ride-through (LVRT) capability is a mandatory standard or specification that wind turbines or wind farms must be able to meet. [0003] The biggest difference between grid-connected w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 王川李滨茅东肖志东郭庆波朱同伟
Owner 北京光耀电力科技股份有限公司
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