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Fan rotating speed recovery control method and system and offshore wind plant

A technology for fan speed and recovery control, applied in wind turbine control, wind power generation, wind turbines, etc., can solve the problem of not being able to alleviate the secondary frequency drop well, avoid sudden changes in output instantaneous power, and simplify torque control , Avoid setting too short effects

Pending Publication Date: 2022-01-07
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a wind turbine speed recovery control method, system and offshore wind farm, thereby solving the problem that the existing wind turbine speed recovery control strategy cannot well alleviate the occurrence of land-based AC systems. The technical problem of the secondary frequency drop

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  • Fan rotating speed recovery control method and system and offshore wind plant
  • Fan rotating speed recovery control method and system and offshore wind plant
  • Fan rotating speed recovery control method and system and offshore wind plant

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Embodiment Construction

[0039] 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.

[0040] In order to alleviate the technical problem of the secondary frequency drop of the land system caused by the existing wind turbine speed recovery control strategy, the present invention provides a wind turbine speed recovery control method, control system and offshore wind farm. The overall idea is: when the wind turbine meets the When the input mechanical power is equal to the output ele...

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Abstract

The invention discloses a fan rotating speed recovery control method and system and an offshore wind farm. After a fan of the offshore wind plant provides frequency support for an onshore system, when the input mechanical power is equal to output electromagnetic power, the fan enters a rotating speed recovery stage, and the fan obtains the additional power Ps1,i (t1) of a rotor; the t1 moment when the input mechanical power is equal to the output electromagnetic power serves as the initial moment of a preset acceleration curve delta Ps2,i (t) at the rotating speed recovery stage, the Ps1,i(t1) serves as the initial value of the preset acceleration curve delta Ps2,i(t) at the rotating speed recovery stage, and the preset acceleration curve is recovered to 0 from the Ps1, i(t1) within a time period of t1 to t1+delta t; and the electromagnetic torque of the fan is controlled, so that the electromagnetic torque meets the additional power control condition within the time period, and the rotating speed recovery stage is ended within the preset rotating speed recovery time. According to the present invention, the time for the fan to provide the frequency support can be guaranteed, the smooth switching from a frequency support stage to the rotating speed recovery stage is achieved, and the problem of secondary frequency drop generated by an onshore alternating current system is relieved.

Description

technical field [0001] The invention belongs to the field of electric power system control, and more specifically, relates to a wind turbine speed recovery control method, system and offshore wind farm. Background technique [0002] In recent years, offshore wind power has attracted worldwide attention due to its advantages such as strong stability, abundant energy, no land occupation, and low noise pollution. When the offshore wind power is far away from the shore, the multi-terminal flexible DC transmission system is an effective means to solve the grid-connected consumption of large-scale offshore wind power. When the flexible DC transmission method is adopted for grid connection, due to the frequency decoupling between the variable speed wind turbine and the onshore AC system, the offshore wind farm cannot directly respond to the frequency offset of the onshore system, which is equivalent to reducing the inertia of the power system. It will weaken the frequency regulati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/36F03D7/00
CPCH02J3/381H02J3/466H02J3/36F03D7/00H02J2300/28Y02E10/72Y02E10/76Y02E60/60
Inventor 姚伟姚雅涵熊永新文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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