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Composite fault ride-through control method and device, equipment and storage medium

A technology of composite faults and control methods, applied in control systems, circuit devices, control generators, etc., can solve problems such as the influence of transient analysis of voltage secondary swell, loss of crowbar circuit, reactive power surplus of double-fed wind turbines, etc. , to achieve the effect of enhancing reactive power support capacity, reducing impact, and facilitating rapid recovery

Pending Publication Date: 2021-11-02
SICHUAN UNIV
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Problems solved by technology

However, due to the existing technology, after the doubly-fed wind turbine completes low-voltage ride-through, the reactive power compensation device cannot be withdrawn immediately, which has an impact on the transient analysis of the second

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  • Composite fault ride-through control method and device, equipment and storage medium
  • Composite fault ride-through control method and device, equipment and storage medium
  • Composite fault ride-through control method and device, equipment and storage medium

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Embodiment Construction

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0065] The applicant analyzed the composite fault ride-through transient state of the doubly-fed wind turbine, and found that the stator flux linkage free component in the high-voltage ride-through phase of the doubly-fed wind turbine composite fault still has the influence parameters in the low-voltage recovery phase. The free component of flux linkage is affected by the voltage drop in the composite fault, and the calculation model of the free component of the stator flux...

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Abstract

The invention provides a composite fault ride-through control method and device, equipment and a storage medium, and relates to the technical field of doubly-fed wind turbine generators. Uncontrollability caused by a rotor side converter bypass can be avoided, reactive power support is provided for a unit to the maximum extent, and the reliability of high voltage ride through is improved. The method comprises the following steps: switching the rotor side converter of a doubly-fed wind turbine generator to an overcurrent suppression mode to operate under the condition that the voltage of a power grid is greater than a preset threshold value, so as to reduce the impact on the doubly-fed wind turbine generator by suppressing the rotor overcurrent and reduce the input frequency of a crowbar circuit; and under the condition that the power grid voltage is larger than a preset threshold value, switching the grid side converter of the doubly-fed wind turbine generator set to operate in an outer loop power grid voltage control mode, and adding a feed-forward compensation item to voltage outer loop control of the grid-side converter, so as to keep the voltage of a direct-current bus stable under the condition that the power grid voltage suddenly rises and carry out reactive power support on the power grid to promote rapid voltage recovery.

Description

technical field [0001] The present application relates to the technical field of doubly-fed wind turbines, in particular to a compound fault ride-through control method, device, equipment and storage medium. Background technique [0002] With the integration of large-scale wind power into the grid, the impact of the operation status of wind turbines on the security and stability of the grid has become increasingly prominent. The research on the single fault ride-through of wind turbines, that is, low voltage ride through and high voltage ride through technology has become increasingly mature. [0003] At present, the high voltage ride-through (High Voltage Ride-Through) of a doubly fed wind turbine (DFIG, Doubly fed Induction Generator) usually adopts a single high-voltage fault. However, due to the existing technology, after the doubly-fed wind turbine completes low-voltage ride-through, the reactive power compensation device cannot be withdrawn immediately, which has an i...

Claims

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Application Information

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IPC IPC(8): H02J3/16H02J3/38H02J3/24H02P9/00H02P9/10
CPCH02J3/16H02J3/381H02J3/24H02P9/007H02P9/105H02J2300/28Y02E10/76Y02E40/30
Inventor 罗欢周步祥严雨豪臧天磊陈实董申赵雯雯
Owner SICHUAN UNIV
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