A method and system for fault traverse control of a doubly fed wind turbine generator system

A doubly-fed wind turbine and fault ride-through technology, applied in the electric power field, can solve the problem of increasing the coupling between active and reactive power control loops of wind turbines, destroying the dq-axis power decoupling control conditions, affecting the accuracy of phase-locking control of wind turbines, etc. problem to improve accuracy

Pending Publication Date: 2019-01-08
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When a short circuit occurs in the power grid, the impedance of the wind power access system will change. Because the power electronic equipment has no inertia and control strategies, the voltage phase of the grid-connected point of the wind farm will have a large jump, which will affect the accuracy of the phase-locked control of the wind turbine. Destroy the dq-axis power decoupling control condition based on voltage space vector orientation, increase the coupling of wind turbine active and reactive power control loops, and affect the unit's fault ride-through capability

Method used

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  • A method and system for fault traverse control of a doubly fed wind turbine generator system
  • A method and system for fault traverse control of a doubly fed wind turbine generator system
  • A method and system for fault traverse control of a doubly fed wind turbine generator system

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Embodiment 1

[0048] The flow chart of a doubly-fed wind turbine fault ride-through control method provided by the present invention is as follows figure 1 shown, including:

[0049] Step 1: Collect the terminal voltage of the doubly-fed wind turbine;

[0050] Step 2: Determine whether the doubly-fed wind turbine enters the preset fault ride-through control mode or enters the normal control mode according to the terminal voltage and the preset threshold;

[0051] The fault ride-through control mode includes determining the rotor control voltage of the doubly-fed wind turbine according to the phase jump value of the terminal voltage.

[0052] Specifically, the fault ride-through control method of DFIG is as follows: figure 2 shown, including:

[0053] Step 101, designing a DFIG rotor voltage direct compensation fault ride-through control strategy based on the voltage phase jump value, including:

[0054] The DFIG determines which control mode to adopt based on the terminal voltage state. ...

Embodiment 2

[0076] Based on the same inventive concept, the present invention also provides a doubly-fed wind turbine fault ride-through control system. Since the principle of these devices to solve technical problems is similar to the doubly-fed wind turbine fault ride-through control method, the repetition will not be repeated.

[0077] The basic structure of the system is as Figure 4 As shown, including: a voltage acquisition module and a control mode determination module;

[0078] Among them, the voltage acquisition module is used to acquire the terminal voltage of the doubly-fed wind turbine;

[0079] The control mode determination module is used to determine whether the doubly-fed wind turbine enters the preset fault ride-through control mode or enters the normal control mode according to the terminal voltage and the preset threshold;

[0080] The fault ride-through control mode includes determining the rotor control voltage of the doubly-fed wind turbine according to the phase ju...

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Abstract

The invention provides a fault crossing control method and a system of a doubly-fed wind turbine generator system, comprising the following steps of: collecting the terminal voltage of the doubly-fedwind turbine generator system; According to the terminal voltage and the preset threshold, the doubly-fed wind turbine generator system enters the preset fault crossing control mode or the normal control mode. The fault ride-through control mode includes determining the rotor control voltage of the doubly fed wind turbine generator system according to the phase jump value of the terminal voltage.The fault crossing control mode provided by the method and the system takes the dynamic influence of the voltage phase into consideration, does not affect the stable operation state of the system, effectively improves the accuracy of the unit control when the terminal voltage phase jumps, and ensures the fault crossing of the doubly-fed wind turbine unit.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a fault ride-through control method and system for a doubly-fed wind turbine. Background technique [0002] Energy is the material basis supporting the progress of human civilization and an indispensable basic condition for the development of modern society. The development of renewable energy, including solar energy, wind energy, biomass energy, geothermal energy, ocean energy, etc., is the major trend of energy development in the world today. Seeking to develop safe and clean alternative energy and exploring sustainable energy models have become the energy sources of countries all over the world. An essential part of developing important trends and strategies. At present, the development and utilization technology of wind power is becoming more and more mature, and its commercial application is widely used, which constantly attracts the attention of countri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/00H02P9/10H02P101/15
CPCH02J3/386H02P9/007H02P9/102H02P2101/15Y02E10/76
Inventor 田新首李琰迟永宁汤海雁刘超苏媛媛
Owner CHINA ELECTRIC POWER RES INST
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