Shafting oscillation suppression control system for double-fed wind generator set under power grid voltage symmetrical swell, and method thereof

A doubly-fed wind power generation and wind turbine technology, which is used in motor generator control, electronic commutation motor control, and control systems, etc., can solve the problem of no low-frequency oscillation of the shaft system.

Active Publication Date: 2015-11-04
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing technology, there is no research on the influence of grid voltage symmetric surge faults on the low-frequency oscillation of th

Method used

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  • Shafting oscillation suppression control system for double-fed wind generator set under power grid voltage symmetrical swell, and method thereof
  • Shafting oscillation suppression control system for double-fed wind generator set under power grid voltage symmetrical swell, and method thereof
  • Shafting oscillation suppression control system for double-fed wind generator set under power grid voltage symmetrical swell, and method thereof

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Embodiment Construction

[0036] Such as figure 1 As shown, in this embodiment, a shafting oscillation suppression control system of a doubly-fed wind power generating set under a symmetrical sudden rise in grid voltage, the doubly-fed wind power generating set includes: a wind turbine, a low-speed shaft, a gearbox, a high-speed shaft, Double-fed wind turbine, rotor-side converter, DC bus capacitor, grid-side converter, power grid, photoelectric encoder and control system; and the control system includes: phase-locked loop, speed loop PI regulator, active current loop PI Regulator, reactive current loop PI regulator and SVPWM module, in specific implementation, a torque differential compensation module is also set in the control system;

[0037] In this embodiment, the grid voltage rating is 690V, and the voltage surge fault causes the voltage to rise to 897V, and the voltage returns to normal after 500ms after the voltage rise; The open circuit voltage is 2000V, the rated current of the rotor is 500A...

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Abstract

The invention discloses a shafting oscillation suppression control system for a double-fed wind generator set under power grid voltage symmetrical swell, and a method thereof. The shafting oscillation suppression control system is characterized in that a torque differential compensation module consisting of a speed differential module, an electromagnetic torque observation module and a torque differential module is arranged in the control system; and a rotor resultant torque is obtained through the speed differential module. Through adoption of the shafting oscillation suppression control system and the method thereof, the fan transmission shaft torque, the electromagnetic torque and the motor rotating speed oscillation can be suppressed under power grid voltage swell, and the shafting low-frequency oscillation attenuation of the wind generator set is accelerated, so that abrasion of a fan transmission shaft and a gearbox in the case of electric network faults is reduced, and the service life of the fan transmission shaft is prolonged.

Description

technical field [0001] The invention belongs to the field of wind power generation, and in particular relates to a shaft system oscillation suppression control system and a method thereof for a doubly-fed wind power generating set under a symmetrical sudden rise in grid voltage. Background technique [0002] Doubly-fed wind turbines are currently the mainstream type of megawatt-scale variable-speed constant-frequency wind turbines. When the grid voltage suddenly rises and fails, the electromagnetic torque of the doubly-fed generator contains a sudden increase in steady-state components and attenuated high-frequency The transient component, the mismatch of wind torque and electromagnetic torque will cause long-term low-frequency oscillation of the flexible drive shaft of the fan. The vibration suppression of the flexible drive shaft of the doubly-fed wind turbine unit after a symmetrical surge in the grid voltage is one of the main goals for realizing high-voltage ride-throug...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02J3/24
Inventor 谢震张旭光张兴李厚涛杨淑英
Owner HEFEI UNIV OF TECH
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