Doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation

A doubly-fed wind turbine, low-voltage ride-through technology, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of low-voltage ride-through, high rotor voltage, and failure to coordinate rotors that cannot make full use of the rotor converter doubly-fed wind turbine Current distribution relationship and other issues

Active Publication Date: 2015-12-23
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Literature [3] proposed that the rotor current command should track the stator current according to a certain ratio. This method can effectively reduce the rotor current during the fault period, but the required rotor voltage is relatively high
These control methods only focus on reducing the rotor voltage or

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  • Doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation
  • Doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation
  • Doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0039] The working principle and specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0040] In order to simplify the analysis, the Park model of the doubly-fed motor is used in the stationary coordinate system, and all variables are converted to the stator side, and the motor convention is used on both the stator and rotor sid...

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Abstract

The invention discloses a doubly-fed wind turbine generator set low-voltage rid through control method based on inductance simulation, and belongs to the technical field of wind power generation. When a fault occurs in a power grid, rotor side converter equivalent port impedance of the doubly-fed wind turbine generator set is simulated into a pure inductance form, an inductance value is dynamically adaptively adjusted in real time according to rotor voltage and current constraints, voltage and current margins of the rotor side converter can be made full use of, a rotor voltage requirement is lowered and rotor fault current are reduced, and a controllable low-voltage ride through capability of the doubly-fed wind turbine generator set is improved. The method provided by the invention can also effectively suppress electromagnetic torque pulsation, and has the advantages of being clear and definite in physical conception, and being simple in structure.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and more specifically relates to a low-voltage ride-through control method of a doubly-fed wind turbine based on inductance simulation. Background technique [0002] With the increasing penetration of wind power in the power grid, modern wind power grid-connected regulations require that wind turbines can maintain continuous operation without disconnecting from the grid during grid faults, and can provide reactive power support to the grid within a specified time, that is, low voltage ride through requirements. [0003] Due to the advantages of variable speed and constant frequency, small capacity of excitation converter, and independent decoupling control of active and reactive power, doubly-fed wind turbine has become the main model of current wind turbines. However, since the stator of the double-fed motor is directly connected to the grid, it is particularly sensitive to grid vo...

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Application Information

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IPC IPC(8): H02J3/38
Inventor 邹旭东朱东海邓璐周诗颖董稳康勇
Owner HUAZHONG UNIV OF SCI & TECH
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