Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network

A wind turbine, low voltage ride-through technology, applied in the direction of controlling generators, control systems, electrical components, etc., can solve the transient electromagnetic shock of the power grid, the serious mechanical shock of wind turbines, the increase of system cost and control difficulty, and the stability of power grid voltage. disadvantage, etc.

Inactive Publication Date: 2009-03-11
CHONGQING UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The "Crowbar Protection" control method in the prior art still has the following deficiencies: ① It is necessary to add a new hardware protection device, which increases the system cost and control difficulty; ② When the power grid fails, the generator operates as an induction

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  • Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network
  • Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network
  • Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network

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Embodiment Construction

[0029] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] In the present invention, the resultant space vector of the rotor current under the rotor shaft system is obtained by detecting the synthesis of the rotor current as

[0031]

[0032] Among them, i ra i rb i rc Respectively, the rotor three-phase instantaneous current, I r is the magnitude of the rotor current space vector, θ r is the position angle of the rotor current space vector under the rotor shafting.

[0033] The rotor current space vector and the detected rotor position angle θ n After the rotation transformation, the synthetic space vector of the rotor current under the stator shaft system can be obtained By decomposing it, the components of the rotor current under the static α and β shafting of the stator can be obtained and which is

[0034] I r s = ...

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Abstract

The invention discloses a low voltage ride-through control method of a doubly fed induction aero-generator, which is used when a power network has short circuit faults. The control method is characterized in that a rotor exciting voltage positive-sequence control current and a rotor exciting voltage negative-sequence control signal are respectively formed through limiting a rotor slip frequency current and a rotor (2-s) rated frequency current when the power network has faults, and a generator is utilized for realizing the attenuation of stator flux transient DC components and reducing the rotor side influences of the stator flux transient components, positive-sequence components and negative-sequence components. The control method has the advantages that no hardware protecting device is required to be added; under the condition that the power network has symmetrical and asymmetrical faults, the overcurrent occurrence of the rotor can be effectively restrained, and the safe operations of the generator and a rotor exciting converter are protected; in the process that the power network has the faults, the transient generator impact to the power network and a mechanical system can be effectively reduced; the normal operation of the generator can be fast recovered after the faults are removed, and the timely support to the power network can be realized.

Description

technical field [0001] The invention relates to the field of operation control of a doubly-fed induction wind-driven generator, in particular to a low-voltage ride-through control method for a doubly-fed induction wind-driven generator when a grid short-circuit fault occurs. Background technique [0002] Due to its advanced and flexible operation characteristics, doubly-fed induction generators have been widely studied and applied in large-scale variable-speed constant-frequency wind turbines. As more and more doubly-fed induction wind turbines are connected to the grid for operation, the power grid has higher and higher requirements for grid-connected doubly-fed induction generators. From the perspective of stable operation of the power system, the system requires the generator set to remain connected to the system when the grid fails, and restore the machine terminal voltage as soon as possible after the fault is removed to maintain stable operation of the system, that is,...

Claims

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Application Information

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IPC IPC(8): H02P9/00H02P9/10H02J3/38
Inventor 姚骏向大为廖勇刘刃
Owner CHONGQING UNIV
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