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A low-voltage cascading fault ride-through control method for doubly-fed wind turbines

A technology for wind turbines and cascading failures, applied in wind power generation, control generators, control systems, etc., to achieve the effect of improving ride-through capability and reliability

Active Publication Date: 2021-06-08
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem of the low-voltage cascading fault ride-through control strategy for wind power generators

Method used

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  • A low-voltage cascading fault ride-through control method for doubly-fed wind turbines
  • A low-voltage cascading fault ride-through control method for doubly-fed wind turbines

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Embodiment Construction

[0024] In order to make the present invention more obvious and understandable, the preferred embodiments are described in detail as follows in conjunction with the accompanying drawings:

[0025] Such as figure 1 , as shown in 2, the present invention provides a low-voltage cascading fault ride-through control method for doubly-fed wind turbines;

[0026] Proceed as follows:

[0027] Step 1: Detect the grid voltage in real time, and obtain the grid voltage positive sequence vector per unit value Ug through the SOGI phase-locked loop + ;

[0028] Step 2: Determine the grid voltage positive sequence vector per unit value Ug + Is it greater than 1.1pu;

[0029] Step 3: If Ug + If it is greater than 1.1pu, check whether LVRT_End is 1 at the same time. If it is 1, it will enter the low-voltage cascading fault ride-through mode.

[0030] Among them, LVRT_End is the low-voltage ride-through end flag signal. When the low-voltage ride-through ends, this flag is set to 1 and clear...

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Abstract

The invention relates to a low-voltage cascading fault ride-through control method for a doubly-fed wind power generating set, which belongs to the technical field of wind power generation. Aiming at the special situation of low and high voltage cascading faults in the power grid, the invention quickly and accurately obtains the power grid voltage positive sequence vector p.u. Occurrence of high-voltage cascading faults; when low-voltage cascading faults occur in the power grid, the coordinated control of the grid-side converter, chopper circuit, and rotor-side converter is carried out synchronously, which effectively improves the performance of the doubly-fed wind turbine in the power grid. In the event of low and high voltage cascading faults, the reliability of the fan’s non-off-grid operation is ensured, and the continuous active power output of the converter is guaranteed during the fault ride-through period; the pulse blockade time is determined according to the low and high voltage mutation range of the power grid, and the low and high voltage of the system is simply and efficiently improved. The ability to ride through cascading faults.

Description

technical field [0001] The invention relates to a low-voltage cascading fault ride-through control method for a doubly-fed wind power generating set, which belongs to the technical field of wind power generation. Background technique [0002] The proportion of wind power generation in my country's energy structure is increasing day by day. In order to ensure the stability of the power system, the State Grid Corporation of China has put forward higher requirements for the stable operation of wind power generation units that do not go off-grid under grid voltage faults, and has formulated related regulations. technical standard. Doubly-fed wind turbines are the most widely used wind turbines in wind farms, and they are also the most sensitive to grid faults. [0003] According to the national standard for grid-connected wind turbines, wind turbines must have low-voltage ride-through and high-voltage ride-through capabilities under grid faults. At present, the requirements of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/12H02P9/10H02P101/15
CPCH02J3/12H02P9/102H02P9/105H02P2101/15Y02E10/76
Inventor 宋小亮戴云霞孙今英李春陈国栋
Owner SHANGHAI ELECTRICGROUP CORP